* Re: [PATCH RFC] vfs: add a O_NOMTIME flag
From: Pavel Machek @ 2015-07-22 13:47 UTC (permalink / raw)
To: NeilBrown
Cc: NeilBrown, J. Bruce Fields, John Stoffel, Austin S Hemmelgarn,
Kevin Easton, Theodore Ts'o, Sage Weil, Trond Myklebust,
Dave Chinner, Zach Brown, Alexander Viro,
Linux FS-devel Mailing List, Linux Kernel Mailing List,
Linux API Mailing List
In-Reply-To: <20150715145456.0376796b@noble>
On Wed 2015-07-15 14:54:56, NeilBrown wrote:
> On Tue, 14 Jul 2015 15:13:00 +0200 Pavel Machek <pavel-+ZI9xUNit7I@public.gmane.org> wrote:
>
> > Hi!
> >
> > > BTW When you "swap" to a file the mtime doesn't get updated. No one seems to
> > > complain about that. I guess it is a rather narrow use-case though.
> >
> > Actually yes, I'd like to complain.
> >
> > It was not swap, it was mount -o loop, but I guess that's the same
> > case. Then rsync refused to work on that file... and being on slow ARM
> > system it took me a while to figure out WTF is going on.
> >
> > So yes, we have problems with mtime, and yes, they matter.
> > Pavel
>
> Odd...
> I assume you mean
> mount -o loop /some/file /mountpoint
>
> and then when you write to the filesystem on /mountpoint the mtime
> of /some/file doesn't get updated?
> I think it should.
> drivers/block/loop.c uses vfs_iter_write() to write to a file.
> That calls f_op->write_iter which will typically call
> generic_file_write_iter() which will call file_update_time() to update
> the time stamps.
Yes, that. I'm pretty sure I seen it, but it was probably on 2.6.X
kernel... Does it make sense to try to reproduce it on the old kernel?
> What filesystem was /some/file on?
Very probably VFAT.
> I just did some testing on ext4 and it seems to do the right thing
> mtime gets updated.
Yes, I tried here, and it seems to be ok.
Thanks,
Pavel
--
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
^ permalink raw reply
* [PATCH v5 39/39] nfs: Add support for the v4.1 dacl attribute
From: Andreas Gruenbacher @ 2015-07-22 13:03 UTC (permalink / raw)
To: linux-kernel
Cc: linux-fsdevel, linux-nfs, linux-api, samba-technical,
linux-security-module, Andreas Gruenbacher
In-Reply-To: <1437570209-29832-1-git-send-email-andreas.gruenbacher@gmail.com>
From: Andreas Gruenbacher <agruenba@redhat.com>
The dacl attribute includes Automatic Inheritance flags not supported by the
acl attribute. it is only supported in NFS version 4.1 and higher. On systems
where NFS version 4.0 is still the default, an additional mount option is
needed:
mount -t nfs4 -o minorversion=1 [...]
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
---
fs/nfs/nfs4proc.c | 2 +-
fs/nfs/nfs4xdr.c | 55 ++++++++++++++++++++++++++++++++++++++++++-------
include/linux/nfs_xdr.h | 2 +-
3 files changed, 50 insertions(+), 9 deletions(-)
diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
index 5ba49c3..39f5548 100644
--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -4469,7 +4469,7 @@ static struct richacl *__nfs4_get_acl_uncached(struct inode *inode)
struct nfs_server *server = NFS_SERVER(inode);
struct page *pages[DIV_ROUND_UP(NFS4ACL_SIZE_MAX, PAGE_SIZE)] = {};
struct nfs_getaclargs args = {
- .fh = NFS_FH(inode),
+ .inode = inode,
.acl_pages = pages,
.acl_len = ARRAY_SIZE(pages) * PAGE_SIZE,
};
diff --git a/fs/nfs/nfs4xdr.c b/fs/nfs/nfs4xdr.c
index 85270df..06f5759 100644
--- a/fs/nfs/nfs4xdr.c
+++ b/fs/nfs/nfs4xdr.c
@@ -1649,9 +1649,16 @@ encode_setacl(struct xdr_stream *xdr, struct nfs_setaclargs *arg, struct compoun
encode_nfs4_stateid(xdr, &zero_stateid);
/* Encode attribute bitmap. */
- p = reserve_space(xdr, 2*4);
- *p++ = cpu_to_be32(1);
- *p = cpu_to_be32(FATTR4_WORD0_ACL);
+ if (arg->server->attr_bitmask[1] & FATTR4_WORD1_DACL) {
+ p = reserve_space(xdr, 3*4);
+ *p++ = cpu_to_be32(2);
+ *p++ = 0;
+ *p = cpu_to_be32(FATTR4_WORD1_DACL);
+ } else {
+ p = reserve_space(xdr, 2*4);
+ *p++ = cpu_to_be32(1);
+ *p = cpu_to_be32(FATTR4_WORD0_ACL);
+ }
attrlen_offset = xdr->buf->len;
xdr_reserve_space(xdr, 4); /* to be backfilled later */
@@ -2486,9 +2493,12 @@ static void nfs4_xdr_enc_getacl(struct rpc_rqst *req, struct xdr_stream *xdr,
encode_compound_hdr(xdr, req, &hdr);
encode_sequence(xdr, &args->seq_args, &hdr);
- encode_putfh(xdr, args->fh, &hdr);
+ encode_putfh(xdr, NFS_FH(args->inode), &hdr);
replen = hdr.replen + op_decode_hdr_maxsz + 1;
- encode_getattr_two(xdr, FATTR4_WORD0_ACL, FATTR4_WORD1_MODE, &hdr);
+ if (NFS_SERVER(args->inode)->attr_bitmask[1] & FATTR4_WORD1_DACL)
+ encode_getattr_two(xdr, 0, FATTR4_WORD1_MODE | FATTR4_WORD1_DACL, &hdr);
+ else
+ encode_getattr_two(xdr, FATTR4_WORD0_ACL, FATTR4_WORD1_MODE, &hdr);
xdr_inline_pages(&req->rq_rcv_buf, replen << 2,
args->acl_pages, 0, args->acl_len);
@@ -5376,14 +5386,28 @@ static int decode_getacl(struct xdr_stream *xdr, struct rpc_rqst *req,
if (unlikely(bitmap[0] & (FATTR4_WORD0_ACL - 1U)))
return -EIO;
- if (likely(bitmap[0] & FATTR4_WORD0_ACL)) {
+
+ if (bitmap[0] & FATTR4_WORD0_ACL) {
+ struct richace *ace;
+
+ if (bitmap[1] & FATTR4_WORD1_DACL)
+ return -EIO;
+
acl = decode_acl_entries(xdr, res->server);
status = PTR_ERR(acl);
if (IS_ERR(acl))
goto out;
+
+ status = -EIO;
+ richacl_for_each_entry(ace, acl) {
+ if (ace->e_flags & RICHACE_INHERITED_ACE)
+ goto out;
+ }
bitmap[0] &= ~FATTR4_WORD0_ACL;
- } else
+ } else if (!(bitmap[1] & FATTR4_WORD1_DACL)) {
status = -EOPNOTSUPP;
+ goto out;
+ }
status = -EIO;
if (unlikely(bitmap[0]))
@@ -5391,6 +5415,23 @@ static int decode_getacl(struct xdr_stream *xdr, struct rpc_rqst *req,
if ((status = decode_attr_mode(xdr, bitmap, &res->mode)) < 0)
goto out;
+ if (bitmap[1] & FATTR4_WORD1_DACL) {
+ unsigned int flags;
+ __be32 *p;
+
+ p = xdr_inline_decode(xdr, 4);
+ status = -EIO;
+ if (unlikely(!p))
+ goto out;
+ flags = be32_to_cpup(p);
+
+ acl = decode_acl_entries(xdr, res->server);
+ status = PTR_ERR(acl);
+ if (IS_ERR(acl))
+ goto out;
+ acl->a_flags = flags;
+ bitmap[1] &= ~FATTR4_WORD1_DACL;
+ }
status = 0;
out:
diff --git a/include/linux/nfs_xdr.h b/include/linux/nfs_xdr.h
index f1c8f93..abe0b66 100644
--- a/include/linux/nfs_xdr.h
+++ b/include/linux/nfs_xdr.h
@@ -695,7 +695,7 @@ struct nfs_setaclres {
struct nfs_getaclargs {
struct nfs4_sequence_args seq_args;
- struct nfs_fh * fh;
+ struct inode * inode;
size_t acl_len;
struct page ** acl_pages;
};
--
2.4.3
^ permalink raw reply related
* [PATCH v5 38/39] nfs: Add richacl support
From: Andreas Gruenbacher @ 2015-07-22 13:03 UTC (permalink / raw)
To: linux-kernel
Cc: linux-fsdevel, linux-nfs, linux-api, samba-technical,
linux-security-module, Andreas Gruenbacher
In-Reply-To: <1437570209-29832-1-git-send-email-andreas.gruenbacher@gmail.com>
From: Andreas Gruenbacher <agruenba@redhat.com>
Add support for the "system.richacl" xattr in nfs. The existing
"system.nfs4_acl" xattr on nfs doesn't map user and group names to uids and
gids; the "system.richacl" xattr does, and only keeps the on-the-wire names
when there is no mapping. This allows to copy permissions across different
file systems.
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
---
fs/nfs/inode.c | 3 -
fs/nfs/nfs4proc.c | 693 +++++++++++++++++++++++++++++++++-------------
fs/nfs/nfs4xdr.c | 181 ++++++++++--
fs/nfs/super.c | 4 +-
include/linux/nfs_fs.h | 1 -
include/linux/nfs_fs_sb.h | 2 +
include/linux/nfs_xdr.h | 9 +-
7 files changed, 669 insertions(+), 224 deletions(-)
diff --git a/fs/nfs/inode.c b/fs/nfs/inode.c
index b77b328..d85e684 100644
--- a/fs/nfs/inode.c
+++ b/fs/nfs/inode.c
@@ -1844,9 +1844,6 @@ struct inode *nfs_alloc_inode(struct super_block *sb)
return NULL;
nfsi->flags = 0UL;
nfsi->cache_validity = 0UL;
-#if IS_ENABLED(CONFIG_NFS_V4)
- nfsi->nfs4_acl = NULL;
-#endif /* CONFIG_NFS_V4 */
return &nfsi->vfs_inode;
}
EXPORT_SYMBOL_GPL(nfs_alloc_inode);
diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
index 467d161..5ba49c3 100644
--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -55,6 +55,9 @@
#include <linux/xattr.h>
#include <linux/utsname.h>
#include <linux/freezer.h>
+#include <linux/richacl.h>
+#include <linux/richacl_xattr.h>
+#include <linux/nfs4acl.h>
#include "nfs4_fs.h"
#include "delegation.h"
@@ -2896,15 +2899,18 @@ static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *f
res.attr_bitmask[2] &= FATTR4_WORD2_NFS42_MASK;
}
memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
- server->caps &= ~(NFS_CAP_ACLS|NFS_CAP_HARDLINKS|
- NFS_CAP_SYMLINKS|NFS_CAP_FILEID|
+ server->caps &= ~(NFS_CAP_ALLOW_ACLS|NFS_CAP_DENY_ACLS|
+ NFS_CAP_HARDLINKS|NFS_CAP_SYMLINKS|NFS_CAP_FILEID|
NFS_CAP_MODE|NFS_CAP_NLINK|NFS_CAP_OWNER|
NFS_CAP_OWNER_GROUP|NFS_CAP_ATIME|
NFS_CAP_CTIME|NFS_CAP_MTIME|
NFS_CAP_SECURITY_LABEL);
- if (res.attr_bitmask[0] & FATTR4_WORD0_ACL &&
- res.acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
- server->caps |= NFS_CAP_ACLS;
+ if (res.attr_bitmask[0] & FATTR4_WORD0_ACL) {
+ if (res.acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
+ server->caps |= NFS_CAP_ALLOW_ACLS;
+ if (res.acl_bitmask & ACL4_SUPPORT_DENY_ACL)
+ server->caps |= NFS_CAP_DENY_ACLS;
+ }
if (res.has_links != 0)
server->caps |= NFS_CAP_HARDLINKS;
if (res.has_symlinks != 0)
@@ -4431,45 +4437,11 @@ static int nfs4_proc_renew(struct nfs_client *clp, struct rpc_cred *cred)
return 0;
}
-static inline int nfs4_server_supports_acls(struct nfs_server *server)
-{
- return server->caps & NFS_CAP_ACLS;
-}
-
-/* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_SIZE, and that
- * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_SIZE) bytes on
- * the stack.
+/* A arbitrary limit; we allocate at most DIV_ROUND_UP(NFS4ACL_SIZE_MAX,
+ * PAGE_SIZE) pages and put an array of DIV_ROUND_UP(NFS4ACL_SIZE_MAX,
+ * PAGE_SIZE) pages on the stack when encoding or decoding acls.
*/
-#define NFS4ACL_MAXPAGES DIV_ROUND_UP(XATTR_SIZE_MAX, PAGE_SIZE)
-
-static int buf_to_pages_noslab(const void *buf, size_t buflen,
- struct page **pages)
-{
- struct page *newpage, **spages;
- int rc = 0;
- size_t len;
- spages = pages;
-
- do {
- len = min_t(size_t, PAGE_SIZE, buflen);
- newpage = alloc_page(GFP_KERNEL);
-
- if (newpage == NULL)
- goto unwind;
- memcpy(page_address(newpage), buf, len);
- buf += len;
- buflen -= len;
- *pages++ = newpage;
- rc++;
- } while (buflen != 0);
-
- return rc;
-
-unwind:
- for(; rc > 0; rc--)
- __free_page(spages[rc-1]);
- return -ENOMEM;
-}
+#define NFS4ACL_SIZE_MAX 65536
struct nfs4_cached_acl {
int cached;
@@ -4477,66 +4449,9 @@ struct nfs4_cached_acl {
char data[0];
};
-static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
-{
- struct nfs_inode *nfsi = NFS_I(inode);
-
- spin_lock(&inode->i_lock);
- kfree(nfsi->nfs4_acl);
- nfsi->nfs4_acl = acl;
- spin_unlock(&inode->i_lock);
-}
-
static void nfs4_zap_acl_attr(struct inode *inode)
{
- nfs4_set_cached_acl(inode, NULL);
-}
-
-static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen)
-{
- struct nfs_inode *nfsi = NFS_I(inode);
- struct nfs4_cached_acl *acl;
- int ret = -ENOENT;
-
- spin_lock(&inode->i_lock);
- acl = nfsi->nfs4_acl;
- if (acl == NULL)
- goto out;
- if (buf == NULL) /* user is just asking for length */
- goto out_len;
- if (acl->cached == 0)
- goto out;
- ret = -ERANGE; /* see getxattr(2) man page */
- if (acl->len > buflen)
- goto out;
- memcpy(buf, acl->data, acl->len);
-out_len:
- ret = acl->len;
-out:
- spin_unlock(&inode->i_lock);
- return ret;
-}
-
-static void nfs4_write_cached_acl(struct inode *inode, struct page **pages, size_t pgbase, size_t acl_len)
-{
- struct nfs4_cached_acl *acl;
- size_t buflen = sizeof(*acl) + acl_len;
-
- if (buflen <= PAGE_SIZE) {
- acl = kmalloc(buflen, GFP_KERNEL);
- if (acl == NULL)
- goto out;
- acl->cached = 1;
- _copy_from_pages(acl->data, pages, pgbase, acl_len);
- } else {
- acl = kmalloc(sizeof(*acl), GFP_KERNEL);
- if (acl == NULL)
- goto out;
- acl->cached = 0;
- }
- acl->len = acl_len;
-out:
- nfs4_set_cached_acl(inode, acl);
+ forget_cached_richacl(inode);
}
/*
@@ -4549,121 +4464,263 @@ out:
* length. The next getxattr call will then produce another round trip to
* the server, this time with the input buf of the required size.
*/
-static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
+static struct richacl *__nfs4_get_acl_uncached(struct inode *inode)
{
- struct page *pages[NFS4ACL_MAXPAGES] = {NULL, };
+ struct nfs_server *server = NFS_SERVER(inode);
+ struct page *pages[DIV_ROUND_UP(NFS4ACL_SIZE_MAX, PAGE_SIZE)] = {};
struct nfs_getaclargs args = {
.fh = NFS_FH(inode),
.acl_pages = pages,
- .acl_len = buflen,
+ .acl_len = ARRAY_SIZE(pages) * PAGE_SIZE,
};
struct nfs_getaclres res = {
- .acl_len = buflen,
+ .server = server,
};
struct rpc_message msg = {
.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
.rpc_argp = &args,
.rpc_resp = &res,
};
- unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE);
- int ret = -ENOMEM, i;
-
- /* As long as we're doing a round trip to the server anyway,
- * let's be prepared for a page of acl data. */
- if (npages == 0)
- npages = 1;
- if (npages > ARRAY_SIZE(pages))
- return -ERANGE;
+ int err, i;
- for (i = 0; i < npages; i++) {
- pages[i] = alloc_page(GFP_KERNEL);
- if (!pages[i])
+ if (ARRAY_SIZE(pages) > 1) {
+ /* for decoding across pages */
+ res.acl_scratch = alloc_page(GFP_KERNEL);
+ err = -ENOMEM;
+ if (!res.acl_scratch)
goto out_free;
}
- /* for decoding across pages */
- res.acl_scratch = alloc_page(GFP_KERNEL);
- if (!res.acl_scratch)
- goto out_free;
-
- args.acl_len = npages * PAGE_SIZE;
-
- dprintk("%s buf %p buflen %zu npages %d args.acl_len %zu\n",
- __func__, buf, buflen, npages, args.acl_len);
- ret = nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode),
+ dprintk("%s args.acl_len %zu\n",
+ __func__, args.acl_len);
+ err = nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode),
&msg, &args.seq_args, &res.seq_res, 0);
- if (ret)
+ if (err)
goto out_free;
- /* Handle the case where the passed-in buffer is too short */
- if (res.acl_flags & NFS4_ACL_TRUNC) {
- /* Did the user only issue a request for the acl length? */
- if (buf == NULL)
- goto out_ok;
- ret = -ERANGE;
- goto out_free;
- }
- nfs4_write_cached_acl(inode, pages, res.acl_data_offset, res.acl_len);
- if (buf) {
- if (res.acl_len > buflen) {
- ret = -ERANGE;
- goto out_free;
- }
- _copy_from_pages(buf, pages, res.acl_data_offset, res.acl_len);
- }
-out_ok:
- ret = res.acl_len;
+ richacl_compute_max_masks(res.acl, inode->i_uid);
+ /* FIXME: Set inode->i_mode from res->mode? */
+ set_cached_richacl(inode, res.acl);
+ err = 0;
+
out_free:
- for (i = 0; i < npages; i++)
- if (pages[i])
- __free_page(pages[i]);
+ if (err) {
+ richacl_put(res.acl);
+ res.acl = ERR_PTR(err);
+ }
+ for (i = 0; i < ARRAY_SIZE(pages) && pages[i]; i++)
+ __free_page(pages[i]);
if (res.acl_scratch)
__free_page(res.acl_scratch);
- return ret;
+ return res.acl;
}
-static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen)
+static struct richacl *nfs4_get_acl_uncached(struct inode *inode)
{
struct nfs4_exception exception = { };
- ssize_t ret;
+ struct richacl *acl;
do {
- ret = __nfs4_get_acl_uncached(inode, buf, buflen);
- trace_nfs4_get_acl(inode, ret);
- if (ret >= 0)
+ acl = __nfs4_get_acl_uncached(inode);
+ trace_nfs4_get_acl(inode, IS_ERR(acl) ? PTR_ERR(acl) : 0);
+ if (!IS_ERR(acl))
break;
- ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
+ acl = ERR_PTR(nfs4_handle_exception(NFS_SERVER(inode), PTR_ERR(acl), &exception));
} while (exception.retry);
- return ret;
+ return acl;
}
-static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen)
+static struct richacl *nfs4_proc_get_acl(struct inode *inode)
{
struct nfs_server *server = NFS_SERVER(inode);
+ struct richacl *acl;
int ret;
- if (!nfs4_server_supports_acls(server))
- return -EOPNOTSUPP;
+ if (!(server->caps & (NFS_CAP_ALLOW_ACLS | NFS_CAP_DENY_ACLS)))
+ return ERR_PTR(-EOPNOTSUPP);
ret = nfs_revalidate_inode(server, inode);
if (ret < 0)
- return ret;
+ return ERR_PTR(ret);
if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL)
nfs_zap_acl_cache(inode);
- ret = nfs4_read_cached_acl(inode, buf, buflen);
- if (ret != -ENOENT)
- /* -ENOENT is returned if there is no ACL or if there is an ACL
- * but no cached acl data, just the acl length */
- return ret;
- return nfs4_get_acl_uncached(inode, buf, buflen);
+ acl = get_cached_richacl(inode);
+ if (acl != ACL_NOT_CACHED)
+ return acl;
+ return nfs4_get_acl_uncached(inode);
+}
+
+static int
+richacl_supported(struct nfs_server *server, struct richacl *acl)
+{
+ struct richace *ace;
+
+ if (!(server->caps & (NFS_CAP_ALLOW_ACLS | NFS_CAP_DENY_ACLS)))
+ return -EOPNOTSUPP;
+
+ richacl_for_each_entry(ace, acl) {
+ if (richace_is_allow(ace)) {
+ if (!(server->caps & NFS_CAP_ALLOW_ACLS))
+ return -EINVAL;
+ } else if (richace_is_deny(ace)) {
+ if (!(server->caps & NFS_CAP_DENY_ACLS))
+ return -EINVAL;
+ } else
+ return -EINVAL;
+ }
+ return 0;
+}
+
+static int
+nfs4_encode_user(struct xdr_stream *xdr, const struct nfs_server *server, kuid_t uid)
+{
+ char name[IDMAP_NAMESZ];
+ int len;
+ __be32 *p;
+
+ len = nfs_map_uid_to_name(server, uid, name, IDMAP_NAMESZ);
+ if (len < 0) {
+ dprintk("nfs: couldn't resolve uid %d to string\n",
+ from_kuid(&init_user_ns, uid));
+ return -ENOENT;
+ }
+ p = xdr_reserve_space(xdr, 4 + len);
+ if (!p)
+ return -EIO;
+ p = xdr_encode_opaque(p, name, len);
+ return 0;
+}
+
+static int
+nfs4_encode_group(struct xdr_stream *xdr, const struct nfs_server *server, kgid_t gid)
+{
+ char name[IDMAP_NAMESZ];
+ int len;
+ __be32 *p;
+
+ len = nfs_map_gid_to_group(server, gid, name, IDMAP_NAMESZ);
+ if (len < 0) {
+ dprintk("nfs: couldn't resolve gid %d to string\n",
+ from_kgid(&init_user_ns, gid));
+ return -ENOENT;
+ }
+ p = xdr_reserve_space(xdr, 4 + len);
+ if (!p)
+ return -EIO;
+ p = xdr_encode_opaque(p, name, len);
+ return 0;
+}
+
+static unsigned int
+nfs4_ace_mask(int minorversion)
+{
+ return minorversion == 0 ? NFS40_ACE_MASK_ALL : NFS4_ACE_MASK_ALL;
+}
+
+static int
+nfs4_encode_ace_who(struct xdr_stream *xdr, const struct nfs_server *server,
+ struct richace *ace, struct richacl *acl)
+{
+ const char *who;
+ __be32 *p;
+
+ if (ace->e_flags & RICHACE_SPECIAL_WHO) {
+ unsigned int special_id = ace->e_id.special;
+ const char *who;
+ unsigned int len;
+
+ if (!nfs4acl_special_id_to_who(special_id, &who, &len)) {
+ WARN_ON_ONCE(1);
+ return -EIO;
+ }
+ p = xdr_reserve_space(xdr, 4 + len);
+ if (!p)
+ return -EIO;
+ xdr_encode_opaque(p, who, len);
+ return 0;
+ } else if ((who = richace_unmapped_identifier(ace, acl))) {
+ unsigned int len = strlen(who);
+
+ p = xdr_reserve_space(xdr, 4 + len);
+ if (!p)
+ return -EIO;
+ xdr_encode_opaque(p, who, len);
+ return 0;
+ } else if (ace->e_flags & RICHACE_IDENTIFIER_GROUP)
+ return nfs4_encode_group(xdr, server, ace->e_id.gid);
+ else
+ return nfs4_encode_user(xdr, server, ace->e_id.uid);
}
-static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
+static int
+nfs4_encode_acl(struct page **pages, unsigned int len, struct richacl *acl,
+ const struct nfs_server *server)
+{
+ int minorversion = server->nfs_client->cl_minorversion;
+ unsigned int ace_mask = nfs4_ace_mask(minorversion);
+ struct xdr_stream xdr;
+ struct xdr_buf buf;
+ __be32 *p;
+ struct richace *ace;
+
+ /* Reject acls not understood by the server */
+ if (server->attr_bitmask[1] & FATTR4_WORD1_DACL) {
+ BUILD_BUG_ON(NFS4_ACE_MASK_ALL != RICHACE_VALID_MASK);
+ } else {
+ if (acl->a_flags)
+ return -EINVAL;
+ richacl_for_each_entry(ace, acl) {
+ if (ace->e_flags & RICHACE_INHERITED_ACE)
+ return -EINVAL;
+ }
+ }
+ richacl_for_each_entry(ace, acl) {
+ if (ace->e_mask & ~ace_mask)
+ return -EINVAL;
+ }
+
+ xdr_init_encode_pages(&xdr, &buf, pages, len);
+
+ if (server->attr_bitmask[1] & FATTR4_WORD1_DACL) {
+ p = xdr_reserve_space(&xdr, 4);
+ if (!p)
+ goto fail;
+ *p = cpu_to_be32(acl ? acl->a_flags : 0);
+ }
+
+ p = xdr_reserve_space(&xdr, 4);
+ if (!p)
+ goto fail;
+ if (!acl) {
+ *p++ = cpu_to_be32(0);
+ return buf.len;
+ }
+ *p++ = cpu_to_be32(acl->a_count);
+
+ richacl_for_each_entry(ace, acl) {
+ p = xdr_reserve_space(&xdr, 4*3);
+ if (!p)
+ goto fail;
+ *p++ = cpu_to_be32(ace->e_type);
+ *p++ = cpu_to_be32(ace->e_flags &
+ ~(RICHACE_SPECIAL_WHO | RICHACE_UNMAPPED_WHO));
+ *p++ = cpu_to_be32(ace->e_mask & NFS4_ACE_MASK_ALL);
+ if (nfs4_encode_ace_who(&xdr, server, ace, acl) != 0)
+ goto fail;
+ }
+
+ return buf.len;
+
+fail:
+ return -ENOMEM;
+}
+
+static int __nfs4_proc_set_acl(struct inode *inode, struct richacl *acl)
{
struct nfs_server *server = NFS_SERVER(inode);
- struct page *pages[NFS4ACL_MAXPAGES];
+ struct page *pages[DIV_ROUND_UP(NFS4ACL_SIZE_MAX, PAGE_SIZE) + 1 /* scratch */] = {};
struct nfs_setaclargs arg = {
+ .server = server,
.fh = NFS_FH(inode),
.acl_pages = pages,
- .acl_len = buflen,
};
struct nfs_setaclres res;
struct rpc_message msg = {
@@ -4671,16 +4728,20 @@ static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t bufl
.rpc_argp = &arg,
.rpc_resp = &res,
};
- unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE);
int ret, i;
- if (!nfs4_server_supports_acls(server))
- return -EOPNOTSUPP;
- if (npages > ARRAY_SIZE(pages))
- return -ERANGE;
- i = buf_to_pages_noslab(buf, buflen, arg.acl_pages);
- if (i < 0)
- return i;
+ ret = richacl_supported(server, acl);
+ if (ret)
+ return ret;
+
+ ret = nfs4_encode_acl(pages, NFS4ACL_SIZE_MAX, acl, server);
+ if (ret < 0) {
+ for (i = 0; i < ARRAY_SIZE(pages) && pages[i]; i++)
+ put_page(pages[i]);
+ return ret;
+ }
+ arg.acl_len = ret;
+
nfs4_inode_return_delegation(inode);
ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
@@ -4688,8 +4749,8 @@ static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t bufl
* Free each page after tx, so the only ref left is
* held by the network stack
*/
- for (; i > 0; i--)
- put_page(pages[i-1]);
+ for (i = 0; i < ARRAY_SIZE(pages) && pages[i]; i++)
+ put_page(pages[i]);
/*
* Acl update can result in inode attribute update.
@@ -4703,12 +4764,12 @@ static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t bufl
return ret;
}
-static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen)
+static int nfs4_proc_set_acl(struct inode *inode, struct richacl *acl)
{
struct nfs4_exception exception = { };
int err;
do {
- err = __nfs4_proc_set_acl(inode, buf, buflen);
+ err = __nfs4_proc_set_acl(inode, acl);
trace_nfs4_set_acl(inode, err);
err = nfs4_handle_exception(NFS_SERVER(inode), err,
&exception);
@@ -6185,34 +6246,284 @@ nfs4_release_lockowner(struct nfs_server *server, struct nfs4_lock_state *lsp)
rpc_call_async(server->client, &msg, 0, &nfs4_release_lockowner_ops, data);
}
+static int nfs4_xattr_set_richacl(struct dentry *dentry, const char *key,
+ const void *buf, size_t buflen,
+ int flags, int handler_flags)
+{
+ struct inode *inode = d_inode(dentry);
+ struct richacl *acl;
+ int error;
+
+ if (strcmp(key, "") != 0)
+ return -EINVAL;
+
+ if (buf) {
+ acl = richacl_from_xattr(&init_user_ns, buf, buflen);
+ if (IS_ERR(acl))
+ return PTR_ERR(acl);
+ error = richacl_apply_masks(&acl, inode->i_uid);
+ } else {
+ /*
+ * "Remove the acl"; only permissions granted by the mode
+ * remain. We are using the cached mode here which could be
+ * outdated; should we do a GETATTR first to narrow down the
+ * race window?
+ */
+ acl = richacl_from_mode(inode->i_mode);
+ error = 0;
+ }
+
+ if (!error)
+ error = nfs4_proc_set_acl(inode, acl);
+ richacl_put(acl);
+ return error;
+}
+
+static int nfs4_xattr_get_richacl(struct dentry *dentry, const char *key,
+ void *buf, size_t buflen, int handler_flags)
+{
+ struct inode *inode = d_inode(dentry);
+ struct richacl *acl;
+ int error;
+ mode_t mode = inode->i_mode & S_IFMT;
+
+ if (strcmp(key, "") != 0)
+ return -EINVAL;
+
+ acl = nfs4_proc_get_acl(inode);
+ if (IS_ERR(acl))
+ return PTR_ERR(acl);
+ if (acl == NULL)
+ return -ENODATA;
+ error = -ENODATA;
+ if (richacl_equiv_mode(acl, &mode) == 0 &&
+ ((mode ^ inode->i_mode) & S_IRWXUGO) == 0)
+ goto out;
+ error = richacl_to_xattr(&init_user_ns, acl, buf, buflen);
+out:
+ richacl_put(acl);
+ return error;
+}
+
+static size_t nfs4_xattr_list_richacl(struct dentry *dentry, char *list,
+ size_t list_len, const char *name,
+ size_t name_len, int handler_flags)
+{
+ struct nfs_server *server = NFS_SERVER(d_inode(dentry));
+ size_t len = sizeof(XATTR_NAME_RICHACL);
+
+ if (!(server->caps & (NFS_CAP_ALLOW_ACLS | NFS_CAP_DENY_ACLS)))
+ return 0;
+
+ if (list && len <= list_len)
+ memcpy(list, XATTR_NAME_RICHACL, len);
+ return len;
+}
+
#define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
+static int richacl_to_nfs4_acl(struct nfs_server *server,
+ const struct richacl *acl,
+ void *buf, size_t buflen)
+{
+ const struct richace *ace;
+ __be32 *p = buf;
+ size_t size = 0;
+
+ size += sizeof(*p);
+ if (buflen >= size)
+ *p++ = cpu_to_be32(acl->a_count);
+
+ richacl_for_each_entry(ace, acl) {
+ char who_buf[IDMAP_NAMESZ];
+ const char *who = who_buf;
+ int who_len;
+
+ size += 3 * sizeof(*p);
+ if (buflen >= size) {
+ *p++ = cpu_to_be32(ace->e_type);
+ *p++ = cpu_to_be32(ace->e_flags &
+ ~(RICHACE_INHERITED_ACE |
+ RICHACE_UNMAPPED_WHO |
+ RICHACE_SPECIAL_WHO));
+ *p++ = cpu_to_be32(ace->e_mask);
+ }
+
+ if (richace_is_unix_user(ace)) {
+ who_len = nfs_map_uid_to_name(server, ace->e_id.uid,
+ who_buf, sizeof(who_buf));
+ if (who_len < 0)
+ return -EIO;
+ } else if (richace_is_unix_group(ace)) {
+ who_len = nfs_map_gid_to_group(server, ace->e_id.gid,
+ who_buf, sizeof(who_buf));
+ if (who_len < 0)
+ return -EIO;
+ } else if (ace->e_flags & RICHACE_SPECIAL_WHO) {
+ if (!nfs4acl_special_id_to_who(ace->e_id.special,
+ &who, &who_len))
+ return -EIO;
+ } else if ((who = richace_unmapped_identifier(ace, acl)))
+ who_len = strlen(who);
+ else
+ return -EIO;
+
+ size += sizeof(*p) + ALIGN(who_len, sizeof(*p));
+ if (buflen >= size) {
+ unsigned int padding = -who_len & (sizeof(*p) - 1);
+
+ *p++ = cpu_to_be32(who_len);
+ memcpy(p, who, who_len);
+ memset((char *)p + who_len, 0, padding);
+ p += DIV_ROUND_UP(who_len, sizeof(*p));
+ }
+ }
+ if (buflen && buflen < size)
+ return -ERANGE;
+ return size;
+}
+
+static struct richacl *richacl_from_nfs4_acl(struct nfs_server *server,
+ const void *buf, size_t buflen)
+{
+ struct richacl *acl = NULL;
+ struct richace *ace;
+ const __be32 *p = buf;
+ int count, err;
+
+ if (buflen < sizeof(*p))
+ return ERR_PTR(-EINVAL);
+ count = be32_to_cpu(*p++);
+ if (count > RICHACL_XATTR_MAX_COUNT)
+ return ERR_PTR(-EINVAL);
+ buflen -= sizeof(*p);
+ acl = richacl_alloc(count, GFP_NOFS);
+ if (!acl)
+ return ERR_PTR(-ENOMEM);
+ richacl_for_each_entry(ace, acl) {
+ u32 who_len, size;
+ int special_id;
+ char *who;
+
+ err = -EINVAL;
+ if (buflen < 4 * sizeof(*p))
+ goto out;
+ ace->e_type = be32_to_cpu(*p++);
+ ace->e_flags = be32_to_cpu(*p++);
+ if (ace->e_flags & (RICHACE_SPECIAL_WHO | RICHACE_UNMAPPED_WHO))
+ goto out;
+ ace->e_mask = be32_to_cpu(*p++);
+ who_len = be32_to_cpu(*p++);
+ buflen -= 4 * sizeof(*p);
+ size = ALIGN(who_len, 4);
+ if (buflen < size || size == 0)
+ goto out;
+ who = (char *)p;
+ special_id = nfs4acl_who_to_special_id(who, who_len);
+ if (special_id >= 0) {
+ ace->e_flags |= RICHACE_SPECIAL_WHO;
+ ace->e_id.special = special_id;
+ } else {
+ bool unmappable;
+
+ if (ace->e_flags & RICHACE_IDENTIFIER_GROUP) {
+ err = nfs_map_group_to_gid(server, who, who_len,
+ &ace->e_id.gid);
+ if (err) {
+ dprintk("%s: nfs_map_group_to_gid "
+ "failed!\n", __func__);
+ goto out;
+ }
+ printk(KERN_ERR "Mapped %.*s to %u\n", who_len, who,
+ from_kgid(&init_user_ns, ace->e_id.gid));
+ /* FIXME: nfsidmap doesn't distinguish between
+ group nobody and unmappable groups! */
+ unmappable = gid_eq(ace->e_id.gid,
+ make_kgid(&init_user_ns, 99));
+ } else {
+ err = nfs_map_name_to_uid(server, who, who_len,
+ &ace->e_id.uid);
+ if (err) {
+ dprintk("%s: nfs_map_name_to_gid "
+ "failed!\n", __func__);
+ goto out;
+ }
+ printk(KERN_ERR "Mapped %.*s to %u\n", who_len, who,
+ from_kuid(&init_user_ns, ace->e_id.uid));
+ /* FIXME: nfsidmap doesn't distinguish between
+ user nobody and unmappable users! */
+ unmappable = uid_eq(ace->e_id.uid,
+ make_kuid(&init_user_ns, 99));
+ }
+ if (unmappable) {
+ err = -ENOMEM;
+ if (richacl_add_unmapped_identifier(&acl, &ace,
+ who, who_len, GFP_NOFS))
+ goto out;
+ }
+ }
+ p += size / sizeof(*p);
+ buflen -= size;
+ }
+ err = -EINVAL;
+ if (buflen != 0)
+ goto out;
+ err = 0;
+
+out:
+ if (err) {
+ richacl_put(acl);
+ acl = ERR_PTR(err);
+ }
+ return acl;
+}
+
static int nfs4_xattr_set_nfs4_acl(struct dentry *dentry, const char *key,
const void *buf, size_t buflen,
int flags, int type)
{
- if (strcmp(key, "") != 0)
+ struct inode *inode = d_inode(dentry);
+ struct richacl *acl;
+ int error;
+
+ if (!buf || strcmp(key, "") != 0)
return -EINVAL;
- return nfs4_proc_set_acl(d_inode(dentry), buf, buflen);
+ acl = richacl_from_nfs4_acl(NFS_SERVER(inode), (void *)buf, buflen);
+ if (IS_ERR(acl))
+ return PTR_ERR(acl);
+ error = nfs4_proc_set_acl(inode, acl);
+ richacl_put(acl);
+ return error;
}
static int nfs4_xattr_get_nfs4_acl(struct dentry *dentry, const char *key,
void *buf, size_t buflen, int type)
{
+ struct inode *inode = d_inode(dentry);
+ struct richacl *acl;
+ int error;
+
if (strcmp(key, "") != 0)
return -EINVAL;
-
- return nfs4_proc_get_acl(d_inode(dentry), buf, buflen);
+ acl = nfs4_proc_get_acl(inode);
+ if (IS_ERR(acl))
+ return PTR_ERR(acl);
+ if (acl == NULL)
+ return -ENODATA;
+ error = richacl_to_nfs4_acl(NFS_SERVER(inode), acl, buf, buflen);
+ richacl_put(acl);
+ return error;
}
static size_t nfs4_xattr_list_nfs4_acl(struct dentry *dentry, char *list,
size_t list_len, const char *name,
size_t name_len, int type)
{
+ struct nfs_server *server = NFS_SERVER(d_inode(dentry));
size_t len = sizeof(XATTR_NAME_NFSV4_ACL);
- if (!nfs4_server_supports_acls(NFS_SERVER(d_inode(dentry))))
+ if (!(server->caps & (NFS_CAP_ALLOW_ACLS | NFS_CAP_DENY_ACLS)))
return 0;
if (list && len <= list_len)
@@ -8751,6 +9062,13 @@ const struct nfs_rpc_ops nfs_v4_clientops = {
.clone_server = nfs_clone_server,
};
+static const struct xattr_handler nfs4_xattr_richacl_handler = {
+ .prefix = XATTR_NAME_RICHACL,
+ .list = nfs4_xattr_list_richacl,
+ .get = nfs4_xattr_get_richacl,
+ .set = nfs4_xattr_set_richacl,
+};
+
static const struct xattr_handler nfs4_xattr_nfs4_acl_handler = {
.prefix = XATTR_NAME_NFSV4_ACL,
.list = nfs4_xattr_list_nfs4_acl,
@@ -8759,6 +9077,7 @@ static const struct xattr_handler nfs4_xattr_nfs4_acl_handler = {
};
const struct xattr_handler *nfs4_xattr_handlers[] = {
+ &nfs4_xattr_richacl_handler,
&nfs4_xattr_nfs4_acl_handler,
#ifdef CONFIG_NFS_V4_SECURITY_LABEL
&nfs4_xattr_nfs4_label_handler,
diff --git a/fs/nfs/nfs4xdr.c b/fs/nfs/nfs4xdr.c
index b2a243b..85270df 100644
--- a/fs/nfs/nfs4xdr.c
+++ b/fs/nfs/nfs4xdr.c
@@ -52,6 +52,10 @@
#include <linux/nfs.h>
#include <linux/nfs4.h>
#include <linux/nfs_fs.h>
+#include <linux/nfs_idmap.h>
+#include <linux/richacl.h>
+#include <linux/richacl_xattr.h> /* for RICHACL_XATTR_MAX_COUNT */
+#include <linux/nfs4acl.h>
#include "nfs4_fs.h"
#include "internal.h"
@@ -724,7 +728,8 @@ static int nfs4_stat_to_errno(int);
#define NFS4_enc_setacl_sz (compound_encode_hdr_maxsz + \
encode_sequence_maxsz + \
encode_putfh_maxsz + \
- encode_setacl_maxsz)
+ encode_setacl_maxsz + \
+ 256 /* for "small" acls */ )
#define NFS4_dec_setacl_sz (compound_decode_hdr_maxsz + \
decode_sequence_maxsz + \
decode_putfh_maxsz + \
@@ -1637,16 +1642,24 @@ encode_restorefh(struct xdr_stream *xdr, struct compound_hdr *hdr)
static void
encode_setacl(struct xdr_stream *xdr, struct nfs_setaclargs *arg, struct compound_hdr *hdr)
{
- __be32 *p;
+ int attrlen_offset;
+ __be32 attrlen, *p;
encode_op_hdr(xdr, OP_SETATTR, decode_setacl_maxsz, hdr);
encode_nfs4_stateid(xdr, &zero_stateid);
+
+ /* Encode attribute bitmap. */
p = reserve_space(xdr, 2*4);
*p++ = cpu_to_be32(1);
*p = cpu_to_be32(FATTR4_WORD0_ACL);
- p = reserve_space(xdr, 4);
- *p = cpu_to_be32(arg->acl_len);
+
+ attrlen_offset = xdr->buf->len;
+ xdr_reserve_space(xdr, 4); /* to be backfilled later */
+
xdr_write_pages(xdr, arg->acl_pages, 0, arg->acl_len);
+
+ attrlen = htonl(xdr->buf->len - attrlen_offset - 4);
+ write_bytes_to_xdr_buf(xdr->buf, attrlen_offset, &attrlen, 4);
}
static void
@@ -2475,7 +2488,7 @@ static void nfs4_xdr_enc_getacl(struct rpc_rqst *req, struct xdr_stream *xdr,
encode_sequence(xdr, &args->seq_args, &hdr);
encode_putfh(xdr, args->fh, &hdr);
replen = hdr.replen + op_decode_hdr_maxsz + 1;
- encode_getattr_two(xdr, FATTR4_WORD0_ACL, 0, &hdr);
+ encode_getattr_two(xdr, FATTR4_WORD0_ACL, FATTR4_WORD1_MODE, &hdr);
xdr_inline_pages(&req->rq_rcv_buf, replen << 2,
args->acl_pages, 0, args->acl_len);
@@ -5227,24 +5240,135 @@ decode_restorefh(struct xdr_stream *xdr)
return decode_op_hdr(xdr, OP_RESTOREFH);
}
+static int
+nfs4_decode_ace_who(struct richace *ace,
+ const char **unmapped, unsigned int *unmapped_len,
+ const struct nfs_server *server,
+ struct xdr_stream *xdr)
+{
+ char *who;
+ u32 len;
+ int special_id;
+ __be32 *p;
+ int error;
+
+ p = xdr_inline_decode(xdr, 4);
+ if (!p)
+ return -ENOMEM; /* acl truncated */
+ len = be32_to_cpup(p++);
+ if (len >= XDR_MAX_NETOBJ) {
+ dprintk("%s: name too long (%u)!\n",
+ __func__, len);
+ return -EIO;
+ }
+ who = (char *)xdr_inline_decode(xdr, len);
+ if (!who)
+ return -ENOMEM; /* acl truncated */
+
+ special_id = nfs4acl_who_to_special_id(who, len);
+ if (special_id >= 0) {
+ ace->e_flags |= RICHACE_SPECIAL_WHO;
+ ace->e_flags &= ~RICHACE_IDENTIFIER_GROUP;
+ ace->e_id.special = special_id;
+ return 0;
+ }
+ if (ace->e_flags & RICHACE_IDENTIFIER_GROUP) {
+ error = nfs_map_group_to_gid(server, who, len, &ace->e_id.gid);
+ if (error) {
+ dprintk("%s: nfs_map_group_to_gid failed!\n",
+ __func__);
+ return error;
+ }
+ /* FIXME: nfsidmap doesn't distinguish between group nobody and
+ unmappable groups! */
+ if (gid_eq(ace->e_id.gid, make_kgid(&init_user_ns, 99))) {
+ *unmapped = who;
+ *unmapped_len = len;
+ }
+ } else {
+ error = nfs_map_name_to_uid(server, who, len, &ace->e_id.uid);
+ if (error) {
+ dprintk("%s: nfs_map_name_to_uid failed!\n",
+ __func__);
+ return error;
+ }
+ /* FIXME: nfsidmap doesn't distinguish between user nobody and
+ unmappable users! */
+ if (uid_eq(ace->e_id.uid, make_kuid(&init_user_ns, 99))) {
+ *unmapped = who;
+ *unmapped_len = len;
+ }
+ }
+ return 0;
+}
+
+static struct richacl *
+decode_acl_entries(struct xdr_stream *xdr, const struct nfs_server *server)
+{
+ struct richacl *acl;
+ struct richace *ace;
+ uint32_t count;
+ __be32 *p;
+ int status;
+
+ p = xdr_inline_decode(xdr, 4);
+ if (unlikely(!p))
+ return ERR_PTR(-ENOMEM); /* acl truncated */
+ count = be32_to_cpup(p);
+ if (count > RICHACL_XATTR_MAX_COUNT)
+ return ERR_PTR(-EIO);
+ acl = richacl_alloc(count, GFP_NOFS);
+ if (!acl)
+ return ERR_PTR(-ENOMEM);
+ richacl_for_each_entry(ace, acl) {
+ const char *unmapped = NULL;
+ unsigned int unmapped_len;
+
+ p = xdr_inline_decode(xdr, 4*3);
+ status = -ENOMEM;
+ if (unlikely(!p))
+ goto out; /* acl truncated */
+ ace->e_type = be32_to_cpup(p++);
+ ace->e_flags = be32_to_cpup(p++);
+ status = -EIO;
+ if (ace->e_flags &
+ (RICHACE_SPECIAL_WHO | RICHACE_UNMAPPED_WHO))
+ goto out;
+ ace->e_mask = be32_to_cpup(p++);
+ status = nfs4_decode_ace_who(ace, &unmapped,
+ &unmapped_len, server,
+ xdr);
+ if (status)
+ goto out;
+ if (unmapped) {
+ status = -ENOMEM;
+ if (richacl_add_unmapped_identifier(&acl, &ace,
+ unmapped, unmapped_len,
+ GFP_NOFS))
+ goto out;
+ }
+ }
+ status = 0;
+
+out:
+ if (status) {
+ richacl_put(acl);
+ acl = ERR_PTR(status);
+ }
+ return acl;
+}
+
static int decode_getacl(struct xdr_stream *xdr, struct rpc_rqst *req,
struct nfs_getaclres *res)
{
unsigned int savep;
uint32_t attrlen,
bitmap[3] = {0};
+ struct richacl *acl = NULL;
int status;
- unsigned int pg_offset;
- res->acl_len = 0;
if ((status = decode_op_hdr(xdr, OP_GETATTR)) != 0)
goto out;
-
- xdr_enter_page(xdr, xdr->buf->page_len);
-
- /* Calculate the offset of the page data */
- pg_offset = xdr->buf->head[0].iov_len;
-
if ((status = decode_attr_bitmap(xdr, bitmap)) != 0)
goto out;
if ((status = decode_attr_length(xdr, &attrlen, &savep)) != 0)
@@ -5253,24 +5377,27 @@ static int decode_getacl(struct xdr_stream *xdr, struct rpc_rqst *req,
if (unlikely(bitmap[0] & (FATTR4_WORD0_ACL - 1U)))
return -EIO;
if (likely(bitmap[0] & FATTR4_WORD0_ACL)) {
-
- /* The bitmap (xdr len + bitmaps) and the attr xdr len words
- * are stored with the acl data to handle the problem of
- * variable length bitmaps.*/
- res->acl_data_offset = xdr_stream_pos(xdr) - pg_offset;
- res->acl_len = attrlen;
-
- /* Check for receive buffer overflow */
- if (res->acl_len > (xdr->nwords << 2) ||
- res->acl_len + res->acl_data_offset > xdr->buf->page_len) {
- res->acl_flags |= NFS4_ACL_TRUNC;
- dprintk("NFS: acl reply: attrlen %u > page_len %u\n",
- attrlen, xdr->nwords << 2);
- }
+ acl = decode_acl_entries(xdr, res->server);
+ status = PTR_ERR(acl);
+ if (IS_ERR(acl))
+ goto out;
+ bitmap[0] &= ~FATTR4_WORD0_ACL;
} else
status = -EOPNOTSUPP;
+ status = -EIO;
+ if (unlikely(bitmap[0]))
+ goto out;
+
+ if ((status = decode_attr_mode(xdr, bitmap, &res->mode)) < 0)
+ goto out;
+ status = 0;
+
out:
+ if (status == 0)
+ res->acl = acl;
+ else
+ richacl_put(acl);
return status;
}
diff --git a/fs/nfs/super.c b/fs/nfs/super.c
index aa62004..fbbcac9 100644
--- a/fs/nfs/super.c
+++ b/fs/nfs/super.c
@@ -2316,7 +2316,7 @@ void nfs_fill_super(struct super_block *sb, struct nfs_mount_info *mount_info)
/* The VFS shouldn't apply the umask to mode bits. We will do
* so ourselves when necessary.
*/
- sb->s_flags |= MS_POSIXACL;
+ sb->s_flags |= MS_RICHACL;
sb->s_time_gran = 1;
}
@@ -2343,7 +2343,7 @@ void nfs_clone_super(struct super_block *sb, struct nfs_mount_info *mount_info)
/* The VFS shouldn't apply the umask to mode bits. We will do
* so ourselves when necessary.
*/
- sb->s_flags |= MS_POSIXACL;
+ sb->s_flags |= MS_RICHACL;
}
nfs_initialise_sb(sb);
diff --git a/include/linux/nfs_fs.h b/include/linux/nfs_fs.h
index f91b5ad..eb09ff3 100644
--- a/include/linux/nfs_fs.h
+++ b/include/linux/nfs_fs.h
@@ -176,7 +176,6 @@ struct nfs_inode {
wait_queue_head_t waitqueue;
#if IS_ENABLED(CONFIG_NFS_V4)
- struct nfs4_cached_acl *nfs4_acl;
/* NFSv4 state */
struct list_head open_states;
struct nfs_delegation __rcu *delegation;
diff --git a/include/linux/nfs_fs_sb.h b/include/linux/nfs_fs_sb.h
index a2ea149..a218cb4 100644
--- a/include/linux/nfs_fs_sb.h
+++ b/include/linux/nfs_fs_sb.h
@@ -238,5 +238,7 @@ struct nfs_server {
#define NFS_CAP_ALLOCATE (1U << 20)
#define NFS_CAP_DEALLOCATE (1U << 21)
#define NFS_CAP_LAYOUTSTATS (1U << 22)
+#define NFS_CAP_ALLOW_ACLS (1U << 23)
+#define NFS_CAP_DENY_ACLS (1U << 24)
#endif
diff --git a/include/linux/nfs_xdr.h b/include/linux/nfs_xdr.h
index f10bbac..f1c8f93 100644
--- a/include/linux/nfs_xdr.h
+++ b/include/linux/nfs_xdr.h
@@ -683,9 +683,10 @@ struct nfs_setattrargs {
struct nfs_setaclargs {
struct nfs4_sequence_args seq_args;
+ const struct nfs_server * server;
struct nfs_fh * fh;
- size_t acl_len;
struct page ** acl_pages;
+ size_t acl_len;
};
struct nfs_setaclres {
@@ -703,9 +704,9 @@ struct nfs_getaclargs {
#define NFS4_ACL_TRUNC 0x0001 /* ACL was truncated */
struct nfs_getaclres {
struct nfs4_sequence_res seq_res;
- size_t acl_len;
- size_t acl_data_offset;
- int acl_flags;
+ const struct nfs_server * server;
+ struct richacl * acl;
+ umode_t mode;
struct page * acl_scratch;
};
--
2.4.3
^ permalink raw reply related
* [PATCH v5 37/39] nfs: Remove unused xdr page offsets in getacl/setacl arguments
From: Andreas Gruenbacher @ 2015-07-22 13:03 UTC (permalink / raw)
To: linux-kernel
Cc: linux-fsdevel, linux-nfs, linux-api, samba-technical,
linux-security-module, Andreas Gruenbacher
In-Reply-To: <1437570209-29832-1-git-send-email-andreas.gruenbacher@gmail.com>
From: Andreas Gruenbacher <agruenba@redhat.com>
The arguments passed around for getacl and setacl xdr encoding, struct
nfs_setaclargs and struct nfs_getaclargs, both contain an array of pages, an
offset into the first page, and the length of the page data. The offset is
unused as it is always zero; remove it.
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
---
fs/nfs/nfs4proc.c | 5 ++---
fs/nfs/nfs4xdr.c | 4 ++--
include/linux/nfs_xdr.h | 2 --
3 files changed, 4 insertions(+), 7 deletions(-)
diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
index 8bee934..467d161 100644
--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -4443,7 +4443,7 @@ static inline int nfs4_server_supports_acls(struct nfs_server *server)
#define NFS4ACL_MAXPAGES DIV_ROUND_UP(XATTR_SIZE_MAX, PAGE_SIZE)
static int buf_to_pages_noslab(const void *buf, size_t buflen,
- struct page **pages, unsigned int *pgbase)
+ struct page **pages)
{
struct page *newpage, **spages;
int rc = 0;
@@ -4587,7 +4587,6 @@ static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t bu
goto out_free;
args.acl_len = npages * PAGE_SIZE;
- args.acl_pgbase = 0;
dprintk("%s buf %p buflen %zu npages %d args.acl_len %zu\n",
__func__, buf, buflen, npages, args.acl_len);
@@ -4679,7 +4678,7 @@ static int __nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t bufl
return -EOPNOTSUPP;
if (npages > ARRAY_SIZE(pages))
return -ERANGE;
- i = buf_to_pages_noslab(buf, buflen, arg.acl_pages, &arg.acl_pgbase);
+ i = buf_to_pages_noslab(buf, buflen, arg.acl_pages);
if (i < 0)
return i;
nfs4_inode_return_delegation(inode);
diff --git a/fs/nfs/nfs4xdr.c b/fs/nfs/nfs4xdr.c
index 67197b8..b2a243b 100644
--- a/fs/nfs/nfs4xdr.c
+++ b/fs/nfs/nfs4xdr.c
@@ -1646,7 +1646,7 @@ encode_setacl(struct xdr_stream *xdr, struct nfs_setaclargs *arg, struct compoun
*p = cpu_to_be32(FATTR4_WORD0_ACL);
p = reserve_space(xdr, 4);
*p = cpu_to_be32(arg->acl_len);
- xdr_write_pages(xdr, arg->acl_pages, arg->acl_pgbase, arg->acl_len);
+ xdr_write_pages(xdr, arg->acl_pages, 0, arg->acl_len);
}
static void
@@ -2478,7 +2478,7 @@ static void nfs4_xdr_enc_getacl(struct rpc_rqst *req, struct xdr_stream *xdr,
encode_getattr_two(xdr, FATTR4_WORD0_ACL, 0, &hdr);
xdr_inline_pages(&req->rq_rcv_buf, replen << 2,
- args->acl_pages, args->acl_pgbase, args->acl_len);
+ args->acl_pages, 0, args->acl_len);
encode_nops(&hdr);
}
diff --git a/include/linux/nfs_xdr.h b/include/linux/nfs_xdr.h
index 7bbe505..f10bbac 100644
--- a/include/linux/nfs_xdr.h
+++ b/include/linux/nfs_xdr.h
@@ -685,7 +685,6 @@ struct nfs_setaclargs {
struct nfs4_sequence_args seq_args;
struct nfs_fh * fh;
size_t acl_len;
- unsigned int acl_pgbase;
struct page ** acl_pages;
};
@@ -697,7 +696,6 @@ struct nfs_getaclargs {
struct nfs4_sequence_args seq_args;
struct nfs_fh * fh;
size_t acl_len;
- unsigned int acl_pgbase;
struct page ** acl_pages;
};
--
2.4.3
^ permalink raw reply related
* [PATCH v5 36/39] nfs: Fix GETATTR bitmap verification
From: Andreas Gruenbacher @ 2015-07-22 13:03 UTC (permalink / raw)
To: linux-kernel
Cc: linux-fsdevel, linux-nfs, linux-api, samba-technical,
linux-security-module, Andreas Gruenbacher
In-Reply-To: <1437570209-29832-1-git-send-email-andreas.gruenbacher@gmail.com>
From: Andreas Gruenbacher <agruenba@redhat.com>
When decoding GETATTR replies, the client checks the attribute bitmap for which
attributes the server has sent. It misses bits at the word boundaries, though;
fix that.
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
---
fs/nfs/nfs4xdr.c | 23 +++++++++++++++++++++++
1 file changed, 23 insertions(+)
diff --git a/fs/nfs/nfs4xdr.c b/fs/nfs/nfs4xdr.c
index 558cd65d..67197b8 100644
--- a/fs/nfs/nfs4xdr.c
+++ b/fs/nfs/nfs4xdr.c
@@ -4346,6 +4346,11 @@ static int decode_statfs(struct xdr_stream *xdr, struct nfs_fsstat *fsstat)
goto xdr_error;
if ((status = decode_attr_files_total(xdr, bitmap, &fsstat->tfiles)) != 0)
goto xdr_error;
+
+ status = -EIO;
+ if (unlikely(bitmap[0]))
+ goto xdr_error;
+
if ((status = decode_attr_space_avail(xdr, bitmap, &fsstat->abytes)) != 0)
goto xdr_error;
if ((status = decode_attr_space_free(xdr, bitmap, &fsstat->fbytes)) != 0)
@@ -4545,6 +4550,10 @@ static int decode_getfattr_attrs(struct xdr_stream *xdr, uint32_t *bitmap,
goto xdr_error;
fattr->valid |= status;
+ status = -EIO;
+ if (unlikely(bitmap[0]))
+ goto xdr_error;
+
status = decode_attr_mode(xdr, bitmap, &fmode);
if (status < 0)
goto xdr_error;
@@ -4598,6 +4607,10 @@ static int decode_getfattr_attrs(struct xdr_stream *xdr, uint32_t *bitmap,
goto xdr_error;
fattr->valid |= status;
+ status = -EIO;
+ if (unlikely(bitmap[1]))
+ goto xdr_error;
+
status = decode_attr_mdsthreshold(xdr, bitmap, fattr->mdsthreshold);
if (status < 0)
goto xdr_error;
@@ -4760,12 +4773,22 @@ static int decode_fsinfo(struct xdr_stream *xdr, struct nfs_fsinfo *fsinfo)
if ((status = decode_attr_maxwrite(xdr, bitmap, &fsinfo->wtmax)) != 0)
goto xdr_error;
fsinfo->wtpref = fsinfo->wtmax;
+
+ status = -EIO;
+ if (unlikely(bitmap[0]))
+ goto xdr_error;
+
status = decode_attr_time_delta(xdr, bitmap, &fsinfo->time_delta);
if (status != 0)
goto xdr_error;
status = decode_attr_pnfstype(xdr, bitmap, &fsinfo->layouttype);
if (status != 0)
goto xdr_error;
+
+ status = -EIO;
+ if (unlikely(bitmap[1]))
+ goto xdr_error;
+
status = decode_attr_layout_blksize(xdr, bitmap, &fsinfo->blksize);
if (status)
goto xdr_error;
--
2.4.3
^ permalink raw reply related
* [PATCH v5 35/39] sunrpc: Add xdr_init_encode_pages
From: Andreas Gruenbacher @ 2015-07-22 13:03 UTC (permalink / raw)
To: linux-kernel
Cc: linux-fsdevel, linux-nfs, linux-api, samba-technical,
linux-security-module, Andreas Gruenbacher
In-Reply-To: <1437570209-29832-1-git-send-email-andreas.gruenbacher@gmail.com>
From: Andreas Gruenbacher <agruenba@redhat.com>
Initialize xdr_stream and xdr_buf from a pages array, for encoding into the
pages.
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
---
include/linux/sunrpc/xdr.h | 2 ++
net/sunrpc/xdr.c | 25 +++++++++++++++++++++++++
2 files changed, 27 insertions(+)
diff --git a/include/linux/sunrpc/xdr.h b/include/linux/sunrpc/xdr.h
index 70c6b92..2c99cff 100644
--- a/include/linux/sunrpc/xdr.h
+++ b/include/linux/sunrpc/xdr.h
@@ -214,6 +214,8 @@ typedef void (*kxdreproc_t)(void *rqstp, struct xdr_stream *xdr, void *obj);
typedef int (*kxdrdproc_t)(void *rqstp, struct xdr_stream *xdr, void *obj);
extern void xdr_init_encode(struct xdr_stream *xdr, struct xdr_buf *buf, __be32 *p);
+extern void xdr_init_encode_pages(struct xdr_stream *xdr, struct xdr_buf *buf,
+ struct page **pages, unsigned int len);
extern __be32 *xdr_reserve_space(struct xdr_stream *xdr, size_t nbytes);
extern void xdr_commit_encode(struct xdr_stream *xdr);
extern void xdr_truncate_encode(struct xdr_stream *xdr, size_t len);
diff --git a/net/sunrpc/xdr.c b/net/sunrpc/xdr.c
index e6a1744..4a4437c 100644
--- a/net/sunrpc/xdr.c
+++ b/net/sunrpc/xdr.c
@@ -483,6 +483,31 @@ void xdr_init_encode(struct xdr_stream *xdr, struct xdr_buf *buf, __be32 *p)
EXPORT_SYMBOL_GPL(xdr_init_encode);
/**
+ * xdr_init_encode_pages - Initialize a struct xdr_stream for encoding into pages.
+ * @xdr: pointer to xdr_stream struct
+ * @buf: pointer to XDR buffer in which to encode data
+ * @pages: pages array in which to encode
+ * @page_len: maximum length of @buf
+ *
+ * Initialize @xdr and @buf for encoding into the @pages array. If a
+ * page in @pages is NULL, it will be allocated on demand.
+ */
+void xdr_init_encode_pages(struct xdr_stream *xdr, struct xdr_buf *buf,
+ struct page **pages, unsigned int len)
+{
+ memset(buf, 0, sizeof(*buf));
+ buf->pages = pages;
+ buf->page_len = len;
+ buf->buflen = len;
+
+ memset(xdr, 0, sizeof(*xdr));
+ xdr->buf = buf;
+ xdr->iov = buf->head;
+ xdr->page_ptr = pages - 1;
+}
+EXPORT_SYMBOL_GPL(xdr_init_encode_pages);
+
+/**
* xdr_commit_encode - Ensure all data is written to buffer
* @xdr: pointer to xdr_stream
*
--
2.4.3
^ permalink raw reply related
* [PATCH v5 34/39] sunrpc: Allow to demand-allocate pages to encode into
From: Andreas Gruenbacher @ 2015-07-22 13:03 UTC (permalink / raw)
To: linux-kernel
Cc: linux-fsdevel, linux-nfs, linux-api, samba-technical,
linux-security-module, Andreas Gruenbacher
In-Reply-To: <1437570209-29832-1-git-send-email-andreas.gruenbacher@gmail.com>
From: Andreas Gruenbacher <agruenba@redhat.com>
When encoding large, variable-length objects such as acls into xdr_bufs, it is
easier to allocate buffer pages on demand rather than precomputing the required
buffer size.
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
---
net/sunrpc/xdr.c | 8 ++++++++
1 file changed, 8 insertions(+)
diff --git a/net/sunrpc/xdr.c b/net/sunrpc/xdr.c
index 4439ac4..e6a1744 100644
--- a/net/sunrpc/xdr.c
+++ b/net/sunrpc/xdr.c
@@ -537,6 +537,14 @@ static __be32 *xdr_get_next_encode_buffer(struct xdr_stream *xdr,
*/
xdr->scratch.iov_base = xdr->p;
xdr->scratch.iov_len = frag1bytes;
+
+ if (!*xdr->page_ptr) {
+ struct page *page = alloc_page(GFP_NOFS);
+ if (!page)
+ return NULL;
+ *xdr->page_ptr = page;
+ }
+
p = page_address(*xdr->page_ptr);
/*
* Note this is where the next encode will start after we've
--
2.4.3
^ permalink raw reply related
* [PATCH v5 33/39] ext4: Don't allow unmapped identifiers in richacls
From: Andreas Gruenbacher @ 2015-07-22 13:03 UTC (permalink / raw)
To: linux-kernel
Cc: linux-fsdevel, linux-nfs, linux-api, samba-technical,
linux-security-module, Andreas Gruenbacher
In-Reply-To: <1437570209-29832-1-git-send-email-andreas.gruenbacher@gmail.com>
From: Andreas Gruenbacher <agruenba@redhat.com>
Don't allow acls which contain unmapped identifiers: they are meaningful for
remote file systems only.
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
---
fs/ext4/richacl.c | 8 +++++++-
1 file changed, 7 insertions(+), 1 deletion(-)
diff --git a/fs/ext4/richacl.c b/fs/ext4/richacl.c
index 6ffb2ae..8aa539e 100644
--- a/fs/ext4/richacl.c
+++ b/fs/ext4/richacl.c
@@ -68,7 +68,13 @@ ext4_set_richacl(handle_t *handle, struct inode *inode, struct richacl *acl)
int retval;
if (acl) {
- mode_t mode = inode->i_mode;
+ mode_t mode;
+
+ /* Don't allow acls with unmapped identifiers. */
+ if (richacl_has_unmapped_identifiers(acl))
+ return -EINVAL;
+
+ mode = inode->i_mode;
if (richacl_equiv_mode(acl, &mode) == 0) {
inode->i_mode = mode;
ext4_mark_inode_dirty(handle, inode);
--
2.4.3
^ permalink raw reply related
* [PATCH v5 32/39] richacl: Add support for unmapped identifiers
From: Andreas Gruenbacher @ 2015-07-22 13:03 UTC (permalink / raw)
To: linux-kernel
Cc: linux-fsdevel, linux-nfs, linux-api, samba-technical,
linux-security-module, Andreas Gruenbacher
In-Reply-To: <1437570209-29832-1-git-send-email-andreas.gruenbacher@gmail.com>
From: Andreas Gruenbacher <agruenba@redhat.com>
Some remote file systems like nfs may return user or group identifiers that
cannot be mapped to local uids / gids. Allow to represent such unmapped
identifiers in richacls. (We still cannot represent unmapped owners and owning
groups, however.)
In the in-memory representation, the richacl is followed by a list of
NUL-terminated strings, with no padding. Entries with an unmapped identifier
have the RICHACE_UNMAPPED_WHO flag set, and ace->e_id.offs specifies the offset
into this list. Multiple entries can refer to the same offset.
The xattr representation is similar, but ace->e_id is ignored, and the list of
unmapped identifier strings contains a string for each acl entry whose
RICHACE_UNMAPPED_WHO flag is set.
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
---
fs/richacl_base.c | 139 ++++++++++++++++++++++++++++++++++++++++++++----
fs/richacl_compat.c | 18 +++----
fs/richacl_xattr.c | 52 +++++++++++++++---
include/linux/richacl.h | 33 ++++++++++--
4 files changed, 212 insertions(+), 30 deletions(-)
diff --git a/fs/richacl_base.c b/fs/richacl_base.c
index 7d17279..8c52d4b 100644
--- a/fs/richacl_base.c
+++ b/fs/richacl_base.c
@@ -23,22 +23,25 @@
MODULE_LICENSE("GPL");
/**
- * richacl_alloc - allocate a richacl
+ * __richacl_alloc - allocate a richacl
* @count: number of entries
+ * @unmapped_size: size to reserve for unmapped identifiers
*/
struct richacl *
-richacl_alloc(int count, gfp_t gfp)
+__richacl_alloc(unsigned int count, size_t unmapped_size, gfp_t gfp)
{
- size_t size = sizeof(struct richacl) + count * sizeof(struct richace);
+ size_t size = sizeof(struct richacl) + count * sizeof(struct richace) +
+ unmapped_size;
struct richacl *acl = kzalloc(size, gfp);
if (acl) {
atomic_set(&acl->a_base.ba_refcount, 1);
acl->a_count = count;
+ acl->a_unmapped_size = unmapped_size;
}
return acl;
}
-EXPORT_SYMBOL_GPL(richacl_alloc);
+EXPORT_SYMBOL_GPL(__richacl_alloc);
/**
* richacl_clone - create a copy of a richacl
@@ -47,7 +50,8 @@ struct richacl *
richacl_clone(const struct richacl *acl, gfp_t gfp)
{
int count = acl->a_count;
- size_t size = sizeof(struct richacl) + count * sizeof(struct richace);
+ size_t size = sizeof(struct richacl) + count * sizeof(struct richace) +
+ acl->a_unmapped_size;
struct richacl *dup = kmalloc(size, gfp);
if (dup) {
@@ -59,6 +63,9 @@ richacl_clone(const struct richacl *acl, gfp_t gfp)
/**
* richace_copy - copy an acl entry
+ *
+ * If @from has an unmapped who value (from->e_flags & RICHACE_UNMAPPED_WHO),
+ * it can only be copied within the same acl!
*/
void
richace_copy(struct richace *to, const struct richace *from)
@@ -66,6 +73,82 @@ richace_copy(struct richace *to, const struct richace *from)
memcpy(to, from, sizeof(struct richace));
}
+/**
+ * richacl_add_unmapped_identifier
+ * @pacl: Pointer to an acl
+ * @pace: acl entry within @acl
+ * @who: unmapped identifier
+ * @len: length of @who
+ * @gfp: memory allocation flags
+ *
+ * Add an unmapped identifier to an acl, possibly reallocating the acl.
+ */
+int richacl_add_unmapped_identifier(struct richacl **pacl,
+ struct richace **pace,
+ const char *who,
+ unsigned int len, gfp_t gfp)
+{
+ struct richacl *acl = *pacl;
+ size_t size = sizeof(struct richacl) +
+ acl->a_count * sizeof(struct richace) +
+ acl->a_unmapped_size + len + 1;
+ unsigned int index = *pace - acl->a_entries;
+
+ acl = krealloc(*pacl, size, gfp);
+ if (acl) {
+ char *unmapped = (char *)(acl->a_entries + acl->a_count);
+ struct richace *ace = acl->a_entries + index;
+
+ ace->e_flags |= RICHACE_UNMAPPED_WHO;
+ ace->e_flags &= ~RICHACE_SPECIAL_WHO;
+ ace->e_id.offs = acl->a_unmapped_size;
+ memcpy(unmapped + ace->e_id.offs, who, len);
+ unmapped[ace->e_id.offs + len] = 0;
+ acl->a_unmapped_size += len + 1;
+ *pace = ace;
+ *pacl = acl;
+ return 0;
+ }
+ return -1;
+}
+EXPORT_SYMBOL_GPL(richacl_add_unmapped_identifier);
+
+/**
+ * richace_unmapped_identifier - get unmapped identifier
+ * @acl: acl containing @ace
+ * @ace: acl entry
+ *
+ * Get the unmapped identifier of @ace as a NUL-terminated string, or NULL if
+ * @ace doesn't have an unmapped identifier.
+ */
+const char *richace_unmapped_identifier(const struct richace *ace,
+ const struct richacl *acl)
+{
+ const char *unmapped = (char *)(acl->a_entries + acl->a_count);
+
+ if (!(ace->e_flags & RICHACE_UNMAPPED_WHO))
+ return NULL;
+ return unmapped + ace->e_id.offs;
+}
+EXPORT_SYMBOL(richace_unmapped_identifier);
+
+/**
+ * richacl_has_unmapped_identifiers
+ *
+ * Check if an acl has unmapped identifiers.
+ */
+bool richacl_has_unmapped_identifiers(struct richacl *acl)
+{
+ struct richace *ace;
+
+ richacl_for_each_entry(ace, acl) {
+ if (ace->e_flags & RICHACE_UNMAPPED_WHO)
+ return true;
+ }
+ return false;
+}
+EXPORT_SYMBOL_GPL(richacl_has_unmapped_identifiers);
+
/*
* richacl_mask_to_mode - compute the file permission bits which correspond to @mask
* @mask: %RICHACE_* permission mask
@@ -209,7 +292,7 @@ static unsigned int richacl_allowed_to_who(struct richacl *acl,
richacl_for_each_entry_reverse(ace, acl) {
if (richace_is_inherit_only(ace))
continue;
- if (richace_is_same_identifier(ace, who) ||
+ if (richace_is_same_identifier(acl, ace, who) ||
richace_is_everyone(ace)) {
if (richace_is_allow(ace))
allowed |= ace->e_mask;
@@ -488,46 +571,73 @@ richacl_inherit(const struct richacl *dir_acl, int isdir)
const struct richace *dir_ace;
struct richacl *acl = NULL;
struct richace *ace;
- int count = 0;
+ unsigned int count = 0, unmapped_size = 0, offset = 0;
+ const char *dir_unmapped;
+ char *unmapped;
if (isdir) {
richacl_for_each_entry(dir_ace, dir_acl) {
if (!richace_is_inheritable(dir_ace))
continue;
+
count++;
+ dir_unmapped =
+ richace_unmapped_identifier(dir_ace, dir_acl);
+ if (dir_unmapped)
+ unmapped_size += strlen(dir_unmapped) + 1;
}
if (!count)
return NULL;
- acl = richacl_alloc(count, GFP_KERNEL);
+ acl = __richacl_alloc(count, unmapped_size, GFP_KERNEL);
if (!acl)
return ERR_PTR(-ENOMEM);
ace = acl->a_entries;
+ unmapped = (char *)(acl->a_entries + acl->a_count);
richacl_for_each_entry(dir_ace, dir_acl) {
if (!richace_is_inheritable(dir_ace))
continue;
+
richace_copy(ace, dir_ace);
if (dir_ace->e_flags & RICHACE_NO_PROPAGATE_INHERIT_ACE)
richace_clear_inheritance_flags(ace);
if ((dir_ace->e_flags & RICHACE_FILE_INHERIT_ACE) &&
!(dir_ace->e_flags & RICHACE_DIRECTORY_INHERIT_ACE))
ace->e_flags |= RICHACE_INHERIT_ONLY_ACE;
+
+ dir_unmapped =
+ richace_unmapped_identifier(dir_ace, dir_acl);
+ if (dir_unmapped) {
+ size_t sz = strlen(dir_unmapped) + 1;
+
+ ace->e_id.offs = offset;
+ memcpy(unmapped, dir_unmapped, sz);
+ unmapped += sz;
+ offset += sz;
+ }
ace++;
}
} else {
richacl_for_each_entry(dir_ace, dir_acl) {
if (!(dir_ace->e_flags & RICHACE_FILE_INHERIT_ACE))
continue;
+
count++;
+ dir_unmapped =
+ richace_unmapped_identifier(dir_ace, dir_acl);
+ if (dir_unmapped)
+ unmapped_size += strlen(dir_unmapped) + 1;
}
if (!count)
return NULL;
- acl = richacl_alloc(count, GFP_KERNEL);
+ acl = __richacl_alloc(count, unmapped_size, GFP_KERNEL);
if (!acl)
return ERR_PTR(-ENOMEM);
ace = acl->a_entries;
+ unmapped = (char *)(acl->a_entries + acl->a_count);
richacl_for_each_entry(dir_ace, dir_acl) {
if (!(dir_ace->e_flags & RICHACE_FILE_INHERIT_ACE))
continue;
+
richace_copy(ace, dir_ace);
richace_clear_inheritance_flags(ace);
/*
@@ -535,6 +645,17 @@ richacl_inherit(const struct richacl *dir_acl, int isdir)
* non-directories, so clear it.
*/
ace->e_mask &= ~RICHACE_DELETE_CHILD;
+
+ dir_unmapped =
+ richace_unmapped_identifier(dir_ace, dir_acl);
+ if (dir_unmapped) {
+ size_t sz = strlen(dir_unmapped) + 1;
+
+ ace->e_id.offs = offset;
+ memcpy(unmapped, dir_unmapped, sz);
+ unmapped += sz;
+ offset += sz;
+ }
ace++;
}
}
diff --git a/fs/richacl_compat.c b/fs/richacl_compat.c
index b7d3990..eea964e 100644
--- a/fs/richacl_compat.c
+++ b/fs/richacl_compat.c
@@ -71,11 +71,13 @@ richacl_insert_entry(struct richacl_alloc *alloc, struct richace **ace)
{
struct richacl *acl = alloc->acl;
unsigned int index = *ace - acl->a_entries;
- size_t tail_size = (acl->a_count - index) * sizeof(struct richace);
+ size_t tail_size = (acl->a_count - index) * sizeof(struct richace) +
+ acl->a_unmapped_size;
if (alloc->count == acl->a_count) {
size_t new_size = sizeof(struct richacl) +
- (acl->a_count + 1) * sizeof(struct richace);
+ (acl->a_count + 1) * sizeof(struct richace) +
+ acl->a_unmapped_size;
acl = krealloc(acl, new_size, GFP_KERNEL);
if (!acl)
@@ -103,10 +105,6 @@ struct richace *richacl_append_entry(struct richacl_alloc *alloc)
struct richacl *acl = alloc->acl;
struct richace *ace = acl->a_entries + acl->a_count;
- if (alloc->count > alloc->acl->a_count) {
- acl->a_count++;
- return ace;
- }
return richacl_insert_entry(alloc, &ace) ? NULL : ace;
}
EXPORT_SYMBOL_GPL(richacl_append_entry);
@@ -260,12 +258,12 @@ __richacl_propagate_everyone(struct richacl_alloc *alloc, struct richace *who,
if (richace_is_inherit_only(ace))
continue;
if (richace_is_allow(ace)) {
- if (richace_is_same_identifier(ace, who)) {
+ if (richace_is_same_identifier(acl, ace, who)) {
allow &= ~ace->e_mask;
allow_last = ace;
}
} else if (richace_is_deny(ace)) {
- if (richace_is_same_identifier(ace, who))
+ if (richace_is_same_identifier(acl, ace, who))
allow &= ~ace->e_mask;
else if (allow & ace->e_mask)
allow_last = NULL;
@@ -587,7 +585,7 @@ __richacl_isolate_who(struct richacl_alloc *alloc, struct richace *who,
richacl_for_each_entry(ace, acl) {
if (richace_is_inherit_only(ace))
continue;
- if (richace_is_same_identifier(ace, who) &&
+ if (richace_is_same_identifier(acl, ace, who) &&
richace_is_deny(ace))
deny &= ~ace->e_mask;
}
@@ -604,7 +602,7 @@ __richacl_isolate_who(struct richacl_alloc *alloc, struct richace *who,
if (richace_is_inherit_only(ace))
continue;
if (richace_is_deny(ace)) {
- if (richace_is_same_identifier(ace, who))
+ if (richace_is_same_identifier(acl, ace, who))
break;
} else if (richace_is_allow(ace) &&
(ace->e_mask & deny)) {
diff --git a/fs/richacl_xattr.c b/fs/richacl_xattr.c
index d145915..1d40000 100644
--- a/fs/richacl_xattr.c
+++ b/fs/richacl_xattr.c
@@ -33,7 +33,8 @@ richacl_from_xattr(struct user_namespace *user_ns,
const struct richace_xattr *xattr_ace = (void *)(xattr_acl + 1);
struct richacl *acl;
struct richace *ace;
- int count;
+ unsigned int count, offset;
+ char *unmapped;
if (size < sizeof(*xattr_acl) ||
xattr_acl->a_version != RICHACL_XATTR_VERSION ||
@@ -43,10 +44,11 @@ richacl_from_xattr(struct user_namespace *user_ns,
count = le16_to_cpu(xattr_acl->a_count);
if (count > RICHACL_XATTR_MAX_COUNT)
return ERR_PTR(-EINVAL);
- if (size != count * sizeof(*xattr_ace))
+ if (size < count * sizeof(*xattr_ace))
return ERR_PTR(-EINVAL);
+ size -= count * sizeof(*xattr_ace);
- acl = richacl_alloc(count, GFP_NOFS);
+ acl = __richacl_alloc(count, size, GFP_NOFS);
if (!acl)
return ERR_PTR(-ENOMEM);
@@ -61,6 +63,16 @@ richacl_from_xattr(struct user_namespace *user_ns,
if (acl->a_other_mask & ~RICHACE_VALID_MASK)
goto fail_einval;
+ unmapped = (char *)(acl->a_entries + count);
+ if (size) {
+ char *xattr_unmapped = (char *)(xattr_ace + count);
+
+ if (xattr_unmapped[size - 1] != 0)
+ goto fail_einval;
+ memcpy(unmapped, xattr_unmapped, size);
+ }
+ offset = 0;
+
richacl_for_each_entry(ace, acl) {
ace->e_type = le16_to_cpu(xattr_ace->e_type);
ace->e_flags = le16_to_cpu(xattr_ace->e_flags);
@@ -72,6 +84,14 @@ richacl_from_xattr(struct user_namespace *user_ns,
ace->e_id.special = le32_to_cpu(xattr_ace->e_id);
if (ace->e_id.special > RICHACE_EVERYONE_SPECIAL_ID)
goto fail_einval;
+ } else if (ace->e_flags & RICHACE_UNMAPPED_WHO) {
+ size_t sz;
+ if (offset == size)
+ goto fail_einval;
+ ace->e_id.offs = offset;
+ sz = strlen(unmapped) + 1;
+ unmapped += sz;
+ offset += sz;
} else if (ace->e_flags & RICHACE_IDENTIFIER_GROUP) {
ace->e_id.gid = make_kgid(user_ns, le32_to_cpu(xattr_ace->e_id));
if (!gid_valid(ace->e_id.gid))
@@ -84,10 +104,12 @@ richacl_from_xattr(struct user_namespace *user_ns,
if (ace->e_type > RICHACE_ACCESS_DENIED_ACE_TYPE ||
(ace->e_mask & ~RICHACE_VALID_MASK))
goto fail_einval;
-
xattr_ace++;
}
+ if (offset != size)
+ goto fail_einval;
+
return acl;
fail_einval:
@@ -103,8 +125,15 @@ size_t
richacl_xattr_size(const struct richacl *acl)
{
size_t size = sizeof(struct richacl_xattr);
+ const struct richace *ace;
size += sizeof(struct richace_xattr) * acl->a_count;
+ richacl_for_each_entry(ace, acl) {
+ const char *unmapped = richace_unmapped_identifier(ace, acl);
+
+ if (unmapped)
+ size += strlen(unmapped) + 1;
+ }
return size;
}
EXPORT_SYMBOL_GPL(richacl_xattr_size);
@@ -123,6 +152,7 @@ richacl_to_xattr(struct user_namespace *user_ns,
struct richace_xattr *xattr_ace;
const struct richace *ace;
size_t real_size;
+ char *xattr_unmapped;
real_size = richacl_xattr_size(acl);
if (!buffer)
@@ -139,13 +169,22 @@ richacl_to_xattr(struct user_namespace *user_ns,
xattr_acl->a_other_mask = cpu_to_le32(acl->a_other_mask);
xattr_ace = (void *)(xattr_acl + 1);
+ xattr_unmapped = (char *)(xattr_ace + acl->a_count);
richacl_for_each_entry(ace, acl) {
+ const char *who;
+
xattr_ace->e_type = cpu_to_le16(ace->e_type);
xattr_ace->e_flags = cpu_to_le16(ace->e_flags);
xattr_ace->e_mask = cpu_to_le32(ace->e_mask);
if (ace->e_flags & RICHACE_SPECIAL_WHO)
xattr_ace->e_id = cpu_to_le32(ace->e_id.special);
- else if (ace->e_flags & RICHACE_IDENTIFIER_GROUP)
+ else if ((who = richace_unmapped_identifier(ace, acl))) {
+ size_t sz = strlen(who) + 1;
+
+ xattr_ace->e_id = 0;
+ memcpy(xattr_unmapped, who, sz);
+ xattr_unmapped += sz;
+ } else if (ace->e_flags & RICHACE_IDENTIFIER_GROUP)
xattr_ace->e_id =
cpu_to_le32(from_kgid(user_ns, ace->e_id.gid));
else
@@ -180,7 +219,8 @@ static void richacl_fix_xattr_userns(
return;
count = size / sizeof(*xattr_ace);
for (; count; count--, xattr_ace++) {
- if (xattr_ace->e_flags & cpu_to_le16(RICHACE_SPECIAL_WHO))
+ if (xattr_ace->e_flags & cpu_to_le16(RICHACE_SPECIAL_WHO |
+ RICHACE_UNMAPPED_WHO))
continue;
if (xattr_ace->e_flags & cpu_to_le16(RICHACE_IDENTIFIER_GROUP)) {
kgid_t gid = make_kgid(from, le32_to_cpu(xattr_ace->e_id));
diff --git a/include/linux/richacl.h b/include/linux/richacl.h
index eeb5bd9..39f5ce4 100644
--- a/include/linux/richacl.h
+++ b/include/linux/richacl.h
@@ -29,6 +29,7 @@ struct richace {
kuid_t uid;
kgid_t gid;
unsigned int special;
+ unsigned short offs; /* unmapped offset */
} e_id;
};
@@ -39,6 +40,7 @@ struct richacl {
unsigned int a_other_mask;
unsigned short a_count;
unsigned short a_flags;
+ unsigned short a_unmapped_size;
struct richace a_entries[0];
};
@@ -75,6 +77,7 @@ struct richacl {
#define RICHACE_INHERIT_ONLY_ACE 0x0008
#define RICHACE_IDENTIFIER_GROUP 0x0040
#define RICHACE_INHERITED_ACE 0x0080
+#define RICHACE_UNMAPPED_WHO 0x2000
#define RICHACE_SPECIAL_WHO 0x4000
#define RICHACE_VALID_FLAGS ( \
@@ -84,6 +87,7 @@ struct richacl {
RICHACE_INHERIT_ONLY_ACE | \
RICHACE_IDENTIFIER_GROUP | \
RICHACE_INHERITED_ACE | \
+ RICHACE_UNMAPPED_WHO | \
RICHACE_SPECIAL_WHO)
/* e_mask bitflags */
@@ -314,14 +318,28 @@ richace_is_deny(const struct richace *ace)
* richace_is_same_identifier - are both identifiers the same?
*/
static inline bool
-richace_is_same_identifier(const struct richace *a, const struct richace *b)
+richace_is_same_identifier(const struct richacl *acl,
+ const struct richace *ace1,
+ const struct richace *ace2)
{
- return !((a->e_flags ^ b->e_flags) &
- (RICHACE_SPECIAL_WHO | RICHACE_IDENTIFIER_GROUP)) &&
- !memcmp(&a->e_id, &b->e_id, sizeof(a->e_id));
+ const char *unmapped = (char *)(acl->a_entries + acl->a_count);
+
+ return !((ace1->e_flags ^ ace2->e_flags) &
+ (RICHACE_SPECIAL_WHO |
+ RICHACE_IDENTIFIER_GROUP |
+ RICHACE_UNMAPPED_WHO)) &&
+ ((ace1->e_flags & RICHACE_UNMAPPED_WHO) ?
+ !strcmp(unmapped + ace1->e_id.offs,
+ unmapped + ace2->e_id.offs) :
+ !memcmp(&ace1->e_id, &ace2->e_id, sizeof(ace1->e_id)));
+}
+
+extern struct richacl *__richacl_alloc(unsigned int, size_t, gfp_t);
+static inline struct richacl *richacl_alloc(unsigned int count, gfp_t gfp)
+{
+ return __richacl_alloc(count, 0, gfp);
}
-extern struct richacl *richacl_alloc(int, gfp_t);
extern struct richacl *richacl_clone(const struct richacl *, gfp_t);
extern void richace_copy(struct richace *, const struct richace *);
extern int richacl_masks_to_mode(const struct richacl *);
@@ -331,6 +349,11 @@ extern void richacl_compute_max_masks(struct richacl *, kuid_t);
extern struct richacl *richacl_chmod(struct richacl *, mode_t);
extern int richacl_equiv_mode(const struct richacl *, mode_t *);
extern struct richacl *richacl_inherit(const struct richacl *, int);
+extern int richacl_add_unmapped_identifier(struct richacl **, struct richace **,
+ const char *, unsigned int, gfp_t);
+extern const char *richace_unmapped_identifier(const struct richace *,
+ const struct richacl *);
+extern bool richacl_has_unmapped_identifiers(struct richacl *);
/* richacl_inode.c */
extern int richacl_permission(struct inode *, const struct richacl *, int);
--
2.4.3
^ permalink raw reply related
* [PATCH v5 31/39] nfsd: Add support for the v4.1 dacl attribute
From: Andreas Gruenbacher @ 2015-07-22 13:03 UTC (permalink / raw)
To: linux-kernel
Cc: linux-fsdevel, linux-nfs, linux-api, samba-technical,
linux-security-module, Andreas Gruenbacher
In-Reply-To: <1437570209-29832-1-git-send-email-andreas.gruenbacher@gmail.com>
From: Andreas Gruenbacher <agruenba@redhat.com>
Richacls support the Automatic Inheritance permission propagation mechanism as
specified in NFSv4.1. Over NFS, this requires support for the dacl attribute:
compared to the acl attribute, the dacl attribute has an additional flags field
which indicates when Automatic Inheritance is in use.
The server will only indicate dacl attribute support in protocol version 4.1
and later, on file systems with richacl support.
This commit also adds support for the NFSv4.1 NFS4_ACE_WRITE_RETENTION and
NFS4_ACE_WRITE_RETENTION_HOLD ACL permissions.
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
---
fs/nfsd/nfs4proc.c | 2 +
fs/nfsd/nfs4xdr.c | 219 ++++++++++++++++++++++++++++++----------------
fs/nfsd/nfsd.h | 6 +-
include/linux/nfs4.h | 1 +
include/uapi/linux/nfs4.h | 3 +-
5 files changed, 155 insertions(+), 76 deletions(-)
diff --git a/fs/nfsd/nfs4proc.c b/fs/nfsd/nfs4proc.c
index 9f8f0a8..ef9e6cd 100644
--- a/fs/nfsd/nfs4proc.c
+++ b/fs/nfsd/nfs4proc.c
@@ -1804,6 +1804,8 @@ static inline u32 nfsd4_getattr_rsize(struct svc_rqst *rqstp,
ret += NFS4_FHSIZE + 4;
bmap0 &= ~FATTR4_WORD0_FILEHANDLE;
}
+ if (bmap1 & FATTR4_WORD1_DACL)
+ return svc_max_payload(rqstp);
if (bmap2 & FATTR4_WORD2_SECURITY_LABEL) {
ret += NFS4_MAXLABELLEN + 12;
bmap2 &= ~FATTR4_WORD2_SECURITY_LABEL;
diff --git a/fs/nfsd/nfs4xdr.c b/fs/nfsd/nfs4xdr.c
index 974b851..7b60573 100644
--- a/fs/nfsd/nfs4xdr.c
+++ b/fs/nfsd/nfs4xdr.c
@@ -301,6 +301,68 @@ nfsd4_decode_bitmap(struct nfsd4_compoundargs *argp, u32 *bmval)
DECODE_TAIL;
}
+static unsigned int
+nfsd4_ace_mask(int minorversion)
+{
+ return minorversion == 0 ? NFS40_ACE_MASK_ALL : NFS4_ACE_MASK_ALL;
+}
+
+static __be32
+nfsd4_decode_acl_entries(struct nfsd4_compoundargs *argp, struct richacl **acl,
+ unsigned short flags_mask, unsigned int ace_mask,
+ int *plen)
+{
+ struct richace *ace;
+ u32 dummy32;
+ char *buf;
+ int len = 0;
+
+ DECODE_HEAD;
+
+ flags_mask &= RICHACE_VALID_FLAGS & ~RICHACE_SPECIAL_WHO;
+
+ READ_BUF(4); len += 4;
+ dummy32 = be32_to_cpup(p++);
+
+ if (dummy32 > NFSD4_ACL_MAX)
+ return nfserr_fbig;
+
+ *acl = svcxdr_alloc_richacl(argp, dummy32);
+ if (*acl == NULL)
+ return nfserr_jukebox;
+
+ richacl_for_each_entry(ace, *acl) {
+ READ_BUF(16); len += 16;
+
+ dummy32 = be32_to_cpup(p++);
+ if (dummy32 > RICHACE_ACCESS_DENIED_ACE_TYPE)
+ return nfserr_inval;
+ ace->e_type = dummy32;
+
+ dummy32 = be32_to_cpup(p++);
+ if (dummy32 & ~flags_mask)
+ return nfserr_inval;
+ ace->e_flags = dummy32;
+
+ dummy32 = be32_to_cpup(p++);
+ if (dummy32 & ~ace_mask)
+ return nfserr_inval;
+ ace->e_mask = dummy32;
+
+ dummy32 = be32_to_cpup(p++);
+ READ_BUF(dummy32);
+ len += XDR_QUADLEN(dummy32) << 2;
+ READMEM(buf, dummy32);
+ status = nfsd4_decode_ace_who(ace, argp->rqstp,
+ buf, dummy32);
+ if (status)
+ return status;
+ }
+ *plen += len;
+
+ DECODE_TAIL;
+}
+
static __be32
nfsd4_decode_fattr(struct nfsd4_compoundargs *argp, u32 *bmval,
struct iattr *iattr, struct richacl **acl,
@@ -312,6 +374,7 @@ nfsd4_decode_fattr(struct nfsd4_compoundargs *argp, u32 *bmval,
DECODE_HEAD;
iattr->ia_valid = 0;
+ *acl = NULL;
if ((status = nfsd4_decode_bitmap(argp, bmval)))
return status;
@@ -325,50 +388,18 @@ nfsd4_decode_fattr(struct nfsd4_compoundargs *argp, u32 *bmval,
iattr->ia_valid |= ATTR_SIZE;
}
if (bmval[0] & FATTR4_WORD0_ACL) {
- u32 nace;
- struct richace *ace;
-
- READ_BUF(4); len += 4;
- nace = be32_to_cpup(p++);
-
- if (nace > NFSD4_ACL_MAX)
- return nfserr_fbig;
+ if (bmval[1] & FATTR4_WORD1_DACL)
+ return nfserr_inval;
- *acl = svcxdr_alloc_richacl(argp, nace);
- if (*acl == NULL)
+ status = nfsd4_decode_acl_entries(argp, acl,
+ ~NFS4_ACE_INHERITED_ACE,
+ nfsd4_ace_mask(argp->minorversion),
+ &len);
+ if (status)
+ return status;
+ else if (*acl == NULL)
return nfserr_jukebox;
-
- richacl_for_each_entry(ace, *acl) {
- READ_BUF(16); len += 16;
-
- dummy32 = be32_to_cpup(p++);
- if (dummy32 > RICHACE_ACCESS_DENIED_ACE_TYPE)
- return nfserr_inval;
- ace->e_type = dummy32;
-
- dummy32 = be32_to_cpup(p++);
- if (dummy32 & (~RICHACE_VALID_FLAGS |
- RICHACE_INHERITED_ACE |
- RICHACE_SPECIAL_WHO))
- return nfserr_inval;
- ace->e_flags = dummy32;
-
- dummy32 = be32_to_cpup(p++);
- if (dummy32 & ~NFS4_ACE_MASK_ALL)
- return nfserr_inval;
- ace->e_mask = dummy32;
-
- dummy32 = be32_to_cpup(p++);
- READ_BUF(dummy32);
- len += XDR_QUADLEN(dummy32) << 2;
- READMEM(buf, dummy32);
- status = nfsd4_decode_ace_who(ace, argp->rqstp,
- buf, dummy32);
- if (status)
- return status;
- }
- } else
- *acl = NULL;
+ }
if (bmval[1] & FATTR4_WORD1_MODE) {
READ_BUF(4);
len += 4;
@@ -436,6 +467,22 @@ nfsd4_decode_fattr(struct nfsd4_compoundargs *argp, u32 *bmval,
goto xdr_error;
}
}
+ if (bmval[1] & FATTR4_WORD1_DACL) {
+ READ_BUF(4);
+ len += 4;
+ dummy32 = be32_to_cpup(p++);
+ if (dummy32 & (~RICHACL_VALID_FLAGS | RICHACL_MASKED))
+ return nfserr_inval;
+ status = nfsd4_decode_acl_entries(argp, acl,
+ ~0,
+ nfsd4_ace_mask(argp->minorversion),
+ &len);
+ if (status)
+ return status;
+ else if (*acl == NULL)
+ return nfserr_jukebox;
+ (*acl)->a_flags = dummy32;
+ }
label->len = 0;
#ifdef CONFIG_NFSD_V4_SECURITY_LABEL
@@ -2216,6 +2263,42 @@ static int get_parent_attributes(struct svc_export *exp, struct kstat *stat)
return err;
}
+static __be32 nfsd4_encode_acl_entries(struct xdr_stream *xdr,
+ struct richacl *acl, struct svc_rqst *rqstp,
+ unsigned short flags_mask, unsigned int ace_mask)
+{
+ __be32 *p;
+
+ flags_mask &= ~RICHACE_SPECIAL_WHO;
+
+ p = xdr_reserve_space(xdr, 4);
+ if (!p)
+ return nfserr_resource;
+
+ if (acl == NULL) {
+ *p++ = cpu_to_be32(0);
+ } else {
+ struct richace *ace;
+
+ *p++ = cpu_to_be32(acl->a_count);
+
+ richacl_for_each_entry(ace, acl) {
+ __be32 status;
+
+ p = xdr_reserve_space(xdr, 4*3);
+ if (!p)
+ return nfserr_resource;
+ *p++ = cpu_to_be32(ace->e_type);
+ *p++ = cpu_to_be32(ace->e_flags & flags_mask);
+ *p++ = cpu_to_be32(ace->e_mask & ace_mask);
+ status = nfsd4_encode_ace_who(xdr, rqstp, ace);
+ if (status)
+ return status;
+ }
+ }
+ return 0;
+}
+
/*
* Note: @fhp can be NULL; in this case, we might have to compose the filehandle
* ourselves.
@@ -2287,15 +2370,16 @@ nfsd4_encode_fattr(struct xdr_stream *xdr, struct svc_fh *fhp,
goto out;
fhp = tempfh;
}
- if (bmval0 & FATTR4_WORD0_ACL) {
+ if ((bmval0 & FATTR4_WORD0_ACL) || (bmval1 & FATTR4_WORD1_DACL)) {
acl = nfsd4_get_acl(rqstp, dentry);
if (IS_ERR(acl)) {
err = PTR_ERR(acl);
acl = NULL;
}
- if (err == -EOPNOTSUPP)
+ if (err == -EOPNOTSUPP) {
bmval0 &= ~FATTR4_WORD0_ACL;
- else if (err == -EINVAL) {
+ bmval1 &= ~FATTR4_WORD1_DACL;
+ } else if (err == -EINVAL) {
status = nfserr_attrnotsupp;
goto out;
} else if (err != 0)
@@ -2353,6 +2437,8 @@ nfsd4_encode_fattr(struct xdr_stream *xdr, struct svc_fh *fhp,
if (!IS_ACL(d_inode(dentry)))
word0 &= ~FATTR4_WORD0_ACL;
+ if (!IS_RICHACL(d_inode(dentry)))
+ word1 &= ~FATTR4_WORD1_DACL;
if (!contextsupport)
word2 &= ~FATTR4_WORD2_SECURITY_LABEL;
if (!word2) {
@@ -2466,35 +2552,12 @@ nfsd4_encode_fattr(struct xdr_stream *xdr, struct svc_fh *fhp,
*p++ = cpu_to_be32(rdattr_err);
}
if (bmval0 & FATTR4_WORD0_ACL) {
- struct richace *ace;
-
- if (acl == NULL) {
- p = xdr_reserve_space(xdr, 4);
- if (!p)
- goto out_resource;
-
- *p++ = cpu_to_be32(0);
- goto out_acl;
- }
- p = xdr_reserve_space(xdr, 4);
- if (!p)
- goto out_resource;
- *p++ = cpu_to_be32(acl->a_count);
-
- richacl_for_each_entry(ace, acl) {
- p = xdr_reserve_space(xdr, 4*3);
- if (!p)
- goto out_resource;
- *p++ = cpu_to_be32(ace->e_type);
- *p++ = cpu_to_be32(ace->e_flags &
- ~(RICHACE_SPECIAL_WHO | RICHACE_INHERITED_ACE));
- *p++ = cpu_to_be32(ace->e_mask & NFS4_ACE_MASK_ALL);
- status = nfsd4_encode_ace_who(xdr, rqstp, ace);
- if (status)
- goto out;
- }
+ status = nfsd4_encode_acl_entries(xdr, acl, rqstp,
+ ~NFS4_ACE_INHERITED_ACE,
+ nfsd4_ace_mask(minorversion));
+ if (status)
+ goto out;
}
-out_acl:
if (bmval0 & FATTR4_WORD0_ACLSUPPORT) {
p = xdr_reserve_space(xdr, 4);
if (!p)
@@ -2703,6 +2766,16 @@ out_acl:
get_parent_attributes(exp, &stat);
p = xdr_encode_hyper(p, stat.ino);
}
+ if (bmval1 & FATTR4_WORD1_DACL) {
+ p = xdr_reserve_space(xdr, 4);
+ if (!p)
+ goto out_resource;
+ *p++ = cpu_to_be32(acl->a_flags);
+ status = nfsd4_encode_acl_entries(xdr, acl, rqstp,
+ ~0, nfsd4_ace_mask(minorversion));
+ if (status)
+ goto out;
+ }
#ifdef CONFIG_NFSD_PNFS
if ((bmval1 & FATTR4_WORD1_FS_LAYOUT_TYPES) ||
(bmval2 & FATTR4_WORD2_LAYOUT_TYPES)) {
diff --git a/fs/nfsd/nfsd.h b/fs/nfsd/nfsd.h
index cf98052..cb5c3ed 100644
--- a/fs/nfsd/nfsd.h
+++ b/fs/nfsd/nfsd.h
@@ -339,7 +339,8 @@ void nfsd_lockd_shutdown(void);
NFSD4_SUPPORTED_ATTRS_WORD0
#define NFSD4_1_SUPPORTED_ATTRS_WORD1 \
- (NFSD4_SUPPORTED_ATTRS_WORD1 | PNFSD_SUPPORTED_ATTRS_WORD1)
+ (NFSD4_SUPPORTED_ATTRS_WORD1 | PNFSD_SUPPORTED_ATTRS_WORD1 | \
+ FATTR4_WORD1_DACL)
#define NFSD4_1_SUPPORTED_ATTRS_WORD2 \
(NFSD4_SUPPORTED_ATTRS_WORD2 | PNFSD_SUPPORTED_ATTRS_WORD2 | \
@@ -386,7 +387,8 @@ static inline u32 nfsd_suppattrs2(u32 minorversion)
(FATTR4_WORD0_SIZE | FATTR4_WORD0_ACL)
#define NFSD_WRITEABLE_ATTRS_WORD1 \
(FATTR4_WORD1_MODE | FATTR4_WORD1_OWNER | FATTR4_WORD1_OWNER_GROUP \
- | FATTR4_WORD1_TIME_ACCESS_SET | FATTR4_WORD1_TIME_MODIFY_SET)
+ | FATTR4_WORD1_TIME_ACCESS_SET | FATTR4_WORD1_TIME_MODIFY_SET \
+ | FATTR4_WORD1_DACL)
#ifdef CONFIG_NFSD_V4_SECURITY_LABEL
#define NFSD_WRITEABLE_ATTRS_WORD2 FATTR4_WORD2_SECURITY_LABEL
#else
diff --git a/include/linux/nfs4.h b/include/linux/nfs4.h
index 992ddc4..1bd4aea 100644
--- a/include/linux/nfs4.h
+++ b/include/linux/nfs4.h
@@ -394,6 +394,7 @@ enum lock_type4 {
#define FATTR4_WORD1_TIME_MODIFY (1UL << 21)
#define FATTR4_WORD1_TIME_MODIFY_SET (1UL << 22)
#define FATTR4_WORD1_MOUNTED_ON_FILEID (1UL << 23)
+#define FATTR4_WORD1_DACL (1UL << 26)
#define FATTR4_WORD1_FS_LAYOUT_TYPES (1UL << 30)
#define FATTR4_WORD2_LAYOUT_TYPES (1UL << 0)
#define FATTR4_WORD2_LAYOUT_BLKSIZE (1UL << 1)
diff --git a/include/uapi/linux/nfs4.h b/include/uapi/linux/nfs4.h
index 2119c7c..64e4c6c 100644
--- a/include/uapi/linux/nfs4.h
+++ b/include/uapi/linux/nfs4.h
@@ -121,7 +121,8 @@
#define NFS4_ACE_GENERIC_READ 0x00120081
#define NFS4_ACE_GENERIC_WRITE 0x00160106
#define NFS4_ACE_GENERIC_EXECUTE 0x001200A0
-#define NFS4_ACE_MASK_ALL 0x001F01FF
+#define NFS40_ACE_MASK_ALL 0x001F01FF
+#define NFS4_ACE_MASK_ALL 0x001F07FF
#define EXCHGID4_FLAG_SUPP_MOVED_REFER 0x00000001
#define EXCHGID4_FLAG_SUPP_MOVED_MIGR 0x00000002
--
2.4.3
^ permalink raw reply related
* [PATCH v5 30/39] nfsd: Add richacl support
From: Andreas Gruenbacher @ 2015-07-22 13:03 UTC (permalink / raw)
To: linux-kernel
Cc: linux-fsdevel, linux-nfs, linux-api, samba-technical,
linux-security-module, Andreas Gruenbacher
In-Reply-To: <1437570209-29832-1-git-send-email-andreas.gruenbacher@gmail.com>
From: Andreas Gruenbacher <agruenba@redhat.com>
On file systems with richacls enabled, get and set richacls directly instead of
converting from / to posix acls.
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
---
fs/nfsd/acl.h | 3 +-
fs/nfsd/nfs4acl.c | 123 +++++++++++++++++++++++++++++++++++++----------------
fs/nfsd/nfs4proc.c | 2 +-
fs/nfsd/nfs4xdr.c | 34 +++++++++++----
4 files changed, 115 insertions(+), 47 deletions(-)
diff --git a/fs/nfsd/acl.h b/fs/nfsd/acl.h
index 1c5deb5..d73c664 100644
--- a/fs/nfsd/acl.h
+++ b/fs/nfsd/acl.h
@@ -53,8 +53,7 @@ __be32 nfsd4_decode_ace_who(struct richace *ace, struct svc_rqst *rqstp,
__be32 nfsd4_encode_ace_who(struct xdr_stream *xdr, struct svc_rqst *rqstp,
struct richace *ace);
-int nfsd4_get_acl(struct svc_rqst *rqstp, struct dentry *dentry,
- struct richacl **acl);
+struct richacl *nfsd4_get_acl(struct svc_rqst *rqstp, struct dentry *dentry);
__be32 nfsd4_set_acl(struct svc_rqst *rqstp, struct svc_fh *fhp,
struct richacl *acl);
diff --git a/fs/nfsd/nfs4acl.c b/fs/nfsd/nfs4acl.c
index 59943df..eabefb0 100644
--- a/fs/nfsd/nfs4acl.c
+++ b/fs/nfsd/nfs4acl.c
@@ -38,6 +38,8 @@
#include <linux/nfs_fs.h>
#include <linux/richacl_compat.h>
#include <linux/nfs4acl.h>
+#include <linux/xattr.h>
+#include <linux/richacl_xattr.h>
#include "nfsfh.h"
#include "nfsd.h"
#include "idmap.h"
@@ -127,31 +129,28 @@ static short ace2type(struct richace *);
static void _posix_to_richacl_one(struct posix_acl *, struct richacl_alloc *,
unsigned int);
-int
-nfsd4_get_acl(struct svc_rqst *rqstp, struct dentry *dentry, struct richacl **acl)
+static struct richacl *
+nfsd4_get_posix_acl(struct svc_rqst *rqstp, struct dentry *dentry)
{
struct inode *inode = d_inode(dentry);
- int error = 0;
struct posix_acl *pacl = NULL, *dpacl = NULL;
struct richacl_alloc alloc;
unsigned int flags = 0;
int count;
pacl = get_acl(inode, ACL_TYPE_ACCESS);
- if (!pacl)
- pacl = posix_acl_from_mode(inode->i_mode, GFP_KERNEL);
-
- if (IS_ERR(pacl))
- return PTR_ERR(pacl);
+ if (IS_ERR_OR_NULL(pacl))
+ return (void *)pacl;
- /* allocate for worst case: one (deny, allow) pair each: */
+ /* Allocate for worst case: one (deny, allow) pair each. The resulting
+ acl will be released shortly and won't be cached. */
count = 2 * pacl->a_count;
if (S_ISDIR(inode->i_mode)) {
flags = FLAG_DIRECTORY;
dpacl = get_acl(inode, ACL_TYPE_DEFAULT);
if (IS_ERR(dpacl)) {
- error = PTR_ERR(dpacl);
+ alloc.acl = (void *)dpacl;
goto rel_pacl;
}
@@ -160,7 +159,7 @@ nfsd4_get_acl(struct svc_rqst *rqstp, struct dentry *dentry, struct richacl **ac
}
if (!richacl_prepare(&alloc, count)) {
- error = -ENOMEM;
+ alloc.acl = ERR_PTR(-ENOMEM);
goto out;
}
@@ -169,13 +168,37 @@ nfsd4_get_acl(struct svc_rqst *rqstp, struct dentry *dentry, struct richacl **ac
if (dpacl)
_posix_to_richacl_one(dpacl, &alloc, flags | FLAG_DEFAULT_ACL);
- *acl = alloc.acl;
-
out:
posix_acl_release(dpacl);
rel_pacl:
posix_acl_release(pacl);
- return error;
+ return alloc.acl;
+}
+
+struct richacl *
+nfsd4_get_acl(struct svc_rqst *rqstp, struct dentry *dentry)
+{
+ struct inode *inode = d_inode(dentry);
+ struct richacl *acl;
+ int error;
+
+ if (IS_RICHACL(inode))
+ acl = get_richacl(inode);
+ else
+ acl = nfsd4_get_posix_acl(rqstp, dentry);
+ if (IS_ERR(acl))
+ return acl;
+ else if (acl == NULL) {
+ acl = richacl_from_mode(inode->i_mode);
+ if (acl == NULL)
+ acl = ERR_PTR(-ENOMEM);
+ }
+ error = richacl_apply_masks(&acl, inode->i_uid);
+ if (error) {
+ richacl_put(acl);
+ acl = ERR_PTR(error);
+ }
+ return acl;
}
struct posix_acl_summary {
@@ -738,56 +761,84 @@ out_estate:
return ret;
}
-__be32
-nfsd4_set_acl(struct svc_rqst *rqstp, struct svc_fh *fhp, struct richacl *acl)
+static int
+nfsd4_set_posix_acl(struct svc_rqst *rqstp, struct dentry *dentry, struct richacl *acl)
{
- __be32 error;
int host_error;
- struct dentry *dentry;
- struct inode *inode;
+ struct inode *inode = d_inode(dentry);
struct posix_acl *pacl = NULL, *dpacl = NULL;
unsigned int flags = 0;
- /* Get inode */
- error = fh_verify(rqstp, fhp, 0, NFSD_MAY_SATTR);
- if (error)
- return error;
-
- dentry = fhp->fh_dentry;
- inode = d_inode(dentry);
-
if (!inode->i_op->set_acl || !IS_POSIXACL(inode))
- return nfserr_attrnotsupp;
+ return -EOPNOTSUPP;
if (S_ISDIR(inode->i_mode))
flags = FLAG_DIRECTORY;
host_error = nfs4_richacl_to_posix(acl, &pacl, &dpacl, flags);
if (host_error == -EINVAL)
- return nfserr_attrnotsupp;
+ return -EOPNOTSUPP;
if (host_error < 0)
- goto out_nfserr;
+ return host_error;
host_error = inode->i_op->set_acl(inode, pacl, ACL_TYPE_ACCESS);
if (host_error < 0)
goto out_release;
- if (S_ISDIR(inode->i_mode)) {
- host_error = inode->i_op->set_acl(inode, dpacl,
- ACL_TYPE_DEFAULT);
- }
+ if (S_ISDIR(inode->i_mode))
+ host_error = inode->i_op->set_acl(inode, dpacl, ACL_TYPE_DEFAULT);
out_release:
posix_acl_release(pacl);
posix_acl_release(dpacl);
-out_nfserr:
+ return host_error;
+}
+
+static int
+nfsd4_set_richacl(struct svc_rqst *rqstp, struct dentry *dentry, struct richacl *acl)
+{
+ int host_error;
+ struct inode *inode = d_inode(dentry);
+ size_t size = richacl_xattr_size(acl);
+ char *buffer;
+
+ if (!inode->i_op->setxattr || !IS_RICHACL(inode))
+ return -EOPNOTSUPP;
+
+ richacl_compute_max_masks(acl, inode->i_uid);
+
+ buffer = kmalloc(size, GFP_KERNEL);
+ if (!buffer)
+ return -ENOMEM;
+ richacl_to_xattr(&init_user_ns, acl, buffer, size);
+ host_error = inode->i_op->setxattr(dentry, RICHACL_XATTR, buffer, size, 0);
+ kfree(buffer);
+ return host_error;
+}
+
+__be32
+nfsd4_set_acl(struct svc_rqst *rqstp, struct svc_fh *fhp, struct richacl *acl)
+{
+ struct dentry *dentry;
+ int host_error;
+ __be32 error;
+
+ error = fh_verify(rqstp, fhp, 0, NFSD_MAY_SATTR);
+ if (error)
+ return error;
+ dentry = fhp->fh_dentry;
+
+ if (IS_RICHACL(d_inode(dentry)))
+ host_error = nfsd4_set_richacl(rqstp, dentry, acl);
+ else
+ host_error = nfsd4_set_posix_acl(rqstp, dentry, acl);
+
if (host_error == -EOPNOTSUPP)
return nfserr_attrnotsupp;
else
return nfserrno(host_error);
}
-
static short
ace2type(struct richace *ace)
{
diff --git a/fs/nfsd/nfs4proc.c b/fs/nfsd/nfs4proc.c
index 8c2cb16..9f8f0a8 100644
--- a/fs/nfsd/nfs4proc.c
+++ b/fs/nfsd/nfs4proc.c
@@ -110,7 +110,7 @@ check_attr_support(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
* in current environment or not.
*/
if (bmval[0] & FATTR4_WORD0_ACL) {
- if (!IS_POSIXACL(d_inode(dentry)))
+ if (!IS_ACL(d_inode(dentry)))
return nfserr_attrnotsupp;
}
diff --git a/fs/nfsd/nfs4xdr.c b/fs/nfsd/nfs4xdr.c
index e66e261..974b851 100644
--- a/fs/nfsd/nfs4xdr.c
+++ b/fs/nfsd/nfs4xdr.c
@@ -340,11 +340,24 @@ nfsd4_decode_fattr(struct nfsd4_compoundargs *argp, u32 *bmval,
richacl_for_each_entry(ace, *acl) {
READ_BUF(16); len += 16;
- ace->e_type = be32_to_cpup(p++);
- ace->e_flags = be32_to_cpup(p++);
- ace->e_mask = be32_to_cpup(p++);
- if (ace->e_flags & RICHACE_SPECIAL_WHO)
+
+ dummy32 = be32_to_cpup(p++);
+ if (dummy32 > RICHACE_ACCESS_DENIED_ACE_TYPE)
+ return nfserr_inval;
+ ace->e_type = dummy32;
+
+ dummy32 = be32_to_cpup(p++);
+ if (dummy32 & (~RICHACE_VALID_FLAGS |
+ RICHACE_INHERITED_ACE |
+ RICHACE_SPECIAL_WHO))
return nfserr_inval;
+ ace->e_flags = dummy32;
+
+ dummy32 = be32_to_cpup(p++);
+ if (dummy32 & ~NFS4_ACE_MASK_ALL)
+ return nfserr_inval;
+ ace->e_mask = dummy32;
+
dummy32 = be32_to_cpup(p++);
READ_BUF(dummy32);
len += XDR_QUADLEN(dummy32) << 2;
@@ -2275,7 +2288,11 @@ nfsd4_encode_fattr(struct xdr_stream *xdr, struct svc_fh *fhp,
fhp = tempfh;
}
if (bmval0 & FATTR4_WORD0_ACL) {
- err = nfsd4_get_nfs4_acl(rqstp, dentry, &acl);
+ acl = nfsd4_get_acl(rqstp, dentry);
+ if (IS_ERR(acl)) {
+ err = PTR_ERR(acl);
+ acl = NULL;
+ }
if (err == -EOPNOTSUPP)
bmval0 &= ~FATTR4_WORD0_ACL;
else if (err == -EINVAL) {
@@ -2334,7 +2351,7 @@ nfsd4_encode_fattr(struct xdr_stream *xdr, struct svc_fh *fhp,
u32 word1 = nfsd_suppattrs1(minorversion);
u32 word2 = nfsd_suppattrs2(minorversion);
- if (!IS_POSIXACL(dentry->d_inode))
+ if (!IS_ACL(d_inode(dentry)))
word0 &= ~FATTR4_WORD0_ACL;
if (!contextsupport)
word2 &= ~FATTR4_WORD2_SECURITY_LABEL;
@@ -2469,7 +2486,8 @@ nfsd4_encode_fattr(struct xdr_stream *xdr, struct svc_fh *fhp,
if (!p)
goto out_resource;
*p++ = cpu_to_be32(ace->e_type);
- *p++ = cpu_to_be32(ace->e_flags & ~RICHACE_SPECIAL_WHO);
+ *p++ = cpu_to_be32(ace->e_flags &
+ ~(RICHACE_SPECIAL_WHO | RICHACE_INHERITED_ACE));
*p++ = cpu_to_be32(ace->e_mask & NFS4_ACE_MASK_ALL);
status = nfsd4_encode_ace_who(xdr, rqstp, ace);
if (status)
@@ -2481,7 +2499,7 @@ out_acl:
p = xdr_reserve_space(xdr, 4);
if (!p)
goto out_resource;
- *p++ = cpu_to_be32(IS_POSIXACL(dentry->d_inode) ?
+ *p++ = cpu_to_be32(IS_ACL(d_inode(dentry)) ?
ACL4_SUPPORT_ALLOW_ACL|ACL4_SUPPORT_DENY_ACL : 0);
}
if (bmval0 & FATTR4_WORD0_CANSETTIME) {
--
2.4.3
^ permalink raw reply related
* [PATCH v5 29/39] nfsd: Use richacls as internal acl representation
From: Andreas Gruenbacher @ 2015-07-22 13:03 UTC (permalink / raw)
To: linux-kernel
Cc: linux-fsdevel, linux-nfs, linux-api, samba-technical,
linux-security-module, Andreas Gruenbacher
In-Reply-To: <1437570209-29832-1-git-send-email-andreas.gruenbacher@gmail.com>
From: Andreas Gruenbacher <agruenba@redhat.com>
When converting from NFSv4 ACLs to POSIX ACLs, nfsd so far was using struct
nfs4_acl as its internal representation. This representation is a subset of
richacls, so get rid of struct nfs4_acl. Richacls even have a more compact
in-memory representation, so a few more ACL entries can easily be supported.
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
---
fs/Kconfig | 6 +
fs/nfs_common/Makefile | 1 +
fs/nfs_common/nfs4acl.c | 41 ++++++
fs/nfsd/Kconfig | 1 +
fs/nfsd/acl.h | 24 ++--
fs/nfsd/nfs4acl.c | 368 ++++++++++++++++++++++--------------------------
fs/nfsd/nfs4proc.c | 15 +-
fs/nfsd/nfs4xdr.c | 62 +++-----
fs/nfsd/xdr4.h | 6 +-
include/linux/nfs4.h | 23 ---
include/linux/nfs4acl.h | 7 +
11 files changed, 268 insertions(+), 286 deletions(-)
create mode 100644 fs/nfs_common/nfs4acl.c
create mode 100644 include/linux/nfs4acl.h
diff --git a/fs/Kconfig b/fs/Kconfig
index 3e09c06..dd3f2d6 100644
--- a/fs/Kconfig
+++ b/fs/Kconfig
@@ -268,6 +268,12 @@ config NFS_COMMON
depends on NFSD || NFS_FS || LOCKD
default y
+config NFS_RICHACL
+ bool
+ depends on NFSD_V4 || NFS_V4
+ select FS_RICHACL
+ default y
+
source "net/sunrpc/Kconfig"
source "fs/ceph/Kconfig"
source "fs/cifs/Kconfig"
diff --git a/fs/nfs_common/Makefile b/fs/nfs_common/Makefile
index d153ca3..e055139 100644
--- a/fs/nfs_common/Makefile
+++ b/fs/nfs_common/Makefile
@@ -4,5 +4,6 @@
obj-$(CONFIG_NFS_ACL_SUPPORT) += nfs_acl.o
nfs_acl-objs := nfsacl.o
+obj-$(CONFIG_NFS_RICHACL) += nfs4acl.o
obj-$(CONFIG_GRACE_PERIOD) += grace.o
diff --git a/fs/nfs_common/nfs4acl.c b/fs/nfs_common/nfs4acl.c
new file mode 100644
index 0000000..6a1f6b8
--- /dev/null
+++ b/fs/nfs_common/nfs4acl.c
@@ -0,0 +1,41 @@
+#include <linux/fs.h>
+#include <linux/richacl.h>
+#include <linux/nfs4acl.h>
+
+static struct special_id {
+ char *who;
+ int len;
+} special_who_map[] = {
+ [RICHACE_OWNER_SPECIAL_ID] =
+ { .who = "OWNER@", .len = sizeof("OWNER@") - 1 },
+ [RICHACE_GROUP_SPECIAL_ID] =
+ { .who = "GROUP@", .len = sizeof("GROUP@") - 1 },
+ [RICHACE_EVERYONE_SPECIAL_ID] =
+ { .who = "EVERYONE@", .len = sizeof("EVERYONE@") - 1 }
+};
+
+int nfs4acl_who_to_special_id(const char *who, u32 len)
+{
+ int n;
+
+ for (n = 0; n < ARRAY_SIZE(special_who_map); n++) {
+ if (len == special_who_map[n].len &&
+ !memcmp(who, special_who_map[n].who, len))
+ return n;
+ }
+ return -1;
+}
+EXPORT_SYMBOL(nfs4acl_who_to_special_id);
+
+bool nfs4acl_special_id_to_who(unsigned int special_who,
+ const char **who, unsigned int *len)
+{
+ struct special_id *special = &special_who_map[special_who];
+
+ if (special_who > ARRAY_SIZE(special_who_map) || !special->len)
+ return false;
+ *who = special->who;
+ *len = special->len;
+ return true;
+}
+EXPORT_SYMBOL(nfs4acl_special_id_to_who);
diff --git a/fs/nfsd/Kconfig b/fs/nfsd/Kconfig
index a0b77fc..811379a 100644
--- a/fs/nfsd/Kconfig
+++ b/fs/nfsd/Kconfig
@@ -70,6 +70,7 @@ config NFSD_V4
depends on NFSD && PROC_FS
select NFSD_V3
select FS_POSIX_ACL
+ select FS_RICHACL
select SUNRPC_GSS
select CRYPTO
select GRACE_PERIOD
diff --git a/fs/nfsd/acl.h b/fs/nfsd/acl.h
index 4cd7c69..1c5deb5 100644
--- a/fs/nfsd/acl.h
+++ b/fs/nfsd/acl.h
@@ -35,25 +35,27 @@
#ifndef LINUX_NFS4_ACL_H
#define LINUX_NFS4_ACL_H
-struct nfs4_acl;
+struct richacl;
+struct richace;
struct svc_fh;
struct svc_rqst;
/*
* Maximum ACL we'll accept from a client; chosen (somewhat
* arbitrarily) so that kmalloc'ing the ACL shouldn't require a
- * high-order allocation. This allows 204 ACEs on x86_64:
+ * high-order allocation. This allows 339 ACEs on x86_64:
*/
-#define NFS4_ACL_MAX ((PAGE_SIZE - sizeof(struct nfs4_acl)) \
- / sizeof(struct nfs4_ace))
+#define NFSD4_ACL_MAX ((PAGE_SIZE - sizeof(struct richacl)) \
+ / sizeof(struct richace))
-int nfs4_acl_bytes(int entries);
-int nfs4_acl_get_whotype(char *, u32);
-__be32 nfs4_acl_write_who(struct xdr_stream *xdr, int who);
+__be32 nfsd4_decode_ace_who(struct richace *ace, struct svc_rqst *rqstp,
+ char *who, u32 len);
+__be32 nfsd4_encode_ace_who(struct xdr_stream *xdr, struct svc_rqst *rqstp,
+ struct richace *ace);
-int nfsd4_get_nfs4_acl(struct svc_rqst *rqstp, struct dentry *dentry,
- struct nfs4_acl **acl);
-__be32 nfsd4_set_nfs4_acl(struct svc_rqst *rqstp, struct svc_fh *fhp,
- struct nfs4_acl *acl);
+int nfsd4_get_acl(struct svc_rqst *rqstp, struct dentry *dentry,
+ struct richacl **acl);
+__be32 nfsd4_set_acl(struct svc_rqst *rqstp, struct svc_fh *fhp,
+ struct richacl *acl);
#endif /* LINUX_NFS4_ACL_H */
diff --git a/fs/nfsd/nfs4acl.c b/fs/nfsd/nfs4acl.c
index eb5accf..59943df 100644
--- a/fs/nfsd/nfs4acl.c
+++ b/fs/nfsd/nfs4acl.c
@@ -36,45 +36,49 @@
#include <linux/slab.h>
#include <linux/nfs_fs.h>
+#include <linux/richacl_compat.h>
+#include <linux/nfs4acl.h>
#include "nfsfh.h"
#include "nfsd.h"
+#include "idmap.h"
#include "acl.h"
#include "vfs.h"
-#define NFS4_ACL_TYPE_DEFAULT 0x01
-#define NFS4_ACL_DIR 0x02
-#define NFS4_ACL_OWNER 0x04
+#define FLAG_DEFAULT_ACL 0x01
+#define FLAG_DIRECTORY 0x02
+#define FLAG_OWNER 0x04
/* mode bit translations: */
-#define NFS4_READ_MODE (NFS4_ACE_READ_DATA)
-#define NFS4_WRITE_MODE (NFS4_ACE_WRITE_DATA | NFS4_ACE_APPEND_DATA)
-#define NFS4_EXECUTE_MODE NFS4_ACE_EXECUTE
-#define NFS4_ANYONE_MODE (NFS4_ACE_READ_ATTRIBUTES | NFS4_ACE_READ_ACL | NFS4_ACE_SYNCHRONIZE)
-#define NFS4_OWNER_MODE (NFS4_ACE_WRITE_ATTRIBUTES | NFS4_ACE_WRITE_ACL)
+#define RICHACE_READ_MODE (RICHACE_READ_DATA)
+#define RICHACE_WRITE_MODE (RICHACE_WRITE_DATA | RICHACE_APPEND_DATA)
+#define RICHACE_EXECUTE_MODE RICHACE_EXECUTE
+#define RICHACE_ANYONE_MODE (RICHACE_READ_ATTRIBUTES | RICHACE_READ_ACL | RICHACE_SYNCHRONIZE)
+#define RICHACE_OWNER_MODE (RICHACE_WRITE_ATTRIBUTES | RICHACE_WRITE_ACL)
/* flags used to simulate posix default ACLs */
-#define NFS4_INHERITANCE_FLAGS (NFS4_ACE_FILE_INHERIT_ACE \
- | NFS4_ACE_DIRECTORY_INHERIT_ACE)
+#define RICHACE_INHERITANCE_FLAGS (RICHACE_FILE_INHERIT_ACE \
+ | RICHACE_DIRECTORY_INHERIT_ACE)
-#define NFS4_SUPPORTED_FLAGS (NFS4_INHERITANCE_FLAGS \
- | NFS4_ACE_INHERIT_ONLY_ACE \
- | NFS4_ACE_IDENTIFIER_GROUP)
+#define RICHACE_SUPPORTED_FLAGS (RICHACE_INHERITANCE_FLAGS \
+ | RICHACE_INHERIT_ONLY_ACE \
+ | RICHACE_IDENTIFIER_GROUP \
+ | RICHACE_SPECIAL_WHO)
static u32
mask_from_posix(unsigned short perm, unsigned int flags)
{
- int mask = NFS4_ANYONE_MODE;
+ int mask = RICHACE_ANYONE_MODE;
- if (flags & NFS4_ACL_OWNER)
- mask |= NFS4_OWNER_MODE;
+ if (flags & FLAG_OWNER)
+ mask |= RICHACE_OWNER_MODE;
if (perm & ACL_READ)
- mask |= NFS4_READ_MODE;
+ mask |= RICHACE_READ_MODE;
if (perm & ACL_WRITE)
- mask |= NFS4_WRITE_MODE;
- if ((perm & ACL_WRITE) && (flags & NFS4_ACL_DIR))
- mask |= NFS4_ACE_DELETE_CHILD;
+ mask |= RICHACE_WRITE_MODE;
+ if ((perm & ACL_WRITE) && (flags & FLAG_DIRECTORY))
+ mask |= RICHACE_DELETE_CHILD;
if (perm & ACL_EXECUTE)
- mask |= NFS4_EXECUTE_MODE;
+ mask |= RICHACE_EXECUTE_MODE;
return mask;
}
@@ -84,13 +88,13 @@ deny_mask_from_posix(unsigned short perm, u32 flags)
u32 mask = 0;
if (perm & ACL_READ)
- mask |= NFS4_READ_MODE;
+ mask |= RICHACE_READ_MODE;
if (perm & ACL_WRITE)
- mask |= NFS4_WRITE_MODE;
- if ((perm & ACL_WRITE) && (flags & NFS4_ACL_DIR))
- mask |= NFS4_ACE_DELETE_CHILD;
+ mask |= RICHACE_WRITE_MODE;
+ if ((perm & ACL_WRITE) && (flags & FLAG_DIRECTORY))
+ mask |= RICHACE_DELETE_CHILD;
if (perm & ACL_EXECUTE)
- mask |= NFS4_EXECUTE_MODE;
+ mask |= RICHACE_EXECUTE_MODE;
return mask;
}
@@ -106,32 +110,32 @@ deny_mask_from_posix(unsigned short perm, u32 flags)
static void
low_mode_from_nfs4(u32 perm, unsigned short *mode, unsigned int flags)
{
- u32 write_mode = NFS4_WRITE_MODE;
+ u32 write_mode = RICHACE_WRITE_MODE;
- if (flags & NFS4_ACL_DIR)
- write_mode |= NFS4_ACE_DELETE_CHILD;
+ if (flags & FLAG_DIRECTORY)
+ write_mode |= RICHACE_DELETE_CHILD;
*mode = 0;
- if ((perm & NFS4_READ_MODE) == NFS4_READ_MODE)
+ if ((perm & RICHACE_READ_MODE) == RICHACE_READ_MODE)
*mode |= ACL_READ;
if ((perm & write_mode) == write_mode)
*mode |= ACL_WRITE;
- if ((perm & NFS4_EXECUTE_MODE) == NFS4_EXECUTE_MODE)
+ if ((perm & RICHACE_EXECUTE_MODE) == RICHACE_EXECUTE_MODE)
*mode |= ACL_EXECUTE;
}
-static short ace2type(struct nfs4_ace *);
-static void _posix_to_nfsv4_one(struct posix_acl *, struct nfs4_acl *,
+static short ace2type(struct richace *);
+static void _posix_to_richacl_one(struct posix_acl *, struct richacl_alloc *,
unsigned int);
int
-nfsd4_get_nfs4_acl(struct svc_rqst *rqstp, struct dentry *dentry,
- struct nfs4_acl **acl)
+nfsd4_get_acl(struct svc_rqst *rqstp, struct dentry *dentry, struct richacl **acl)
{
struct inode *inode = d_inode(dentry);
int error = 0;
struct posix_acl *pacl = NULL, *dpacl = NULL;
+ struct richacl_alloc alloc;
unsigned int flags = 0;
- int size = 0;
+ int count;
pacl = get_acl(inode, ACL_TYPE_ACCESS);
if (!pacl)
@@ -141,10 +145,10 @@ nfsd4_get_nfs4_acl(struct svc_rqst *rqstp, struct dentry *dentry,
return PTR_ERR(pacl);
/* allocate for worst case: one (deny, allow) pair each: */
- size += 2 * pacl->a_count;
+ count = 2 * pacl->a_count;
if (S_ISDIR(inode->i_mode)) {
- flags = NFS4_ACL_DIR;
+ flags = FLAG_DIRECTORY;
dpacl = get_acl(inode, ACL_TYPE_DEFAULT);
if (IS_ERR(dpacl)) {
error = PTR_ERR(dpacl);
@@ -152,20 +156,20 @@ nfsd4_get_nfs4_acl(struct svc_rqst *rqstp, struct dentry *dentry,
}
if (dpacl)
- size += 2 * dpacl->a_count;
+ count += 2 * dpacl->a_count;
}
- *acl = kmalloc(nfs4_acl_bytes(size), GFP_KERNEL);
- if (*acl == NULL) {
+ if (!richacl_prepare(&alloc, count)) {
error = -ENOMEM;
goto out;
}
- (*acl)->naces = 0;
- _posix_to_nfsv4_one(pacl, *acl, flags & ~NFS4_ACL_TYPE_DEFAULT);
+ _posix_to_richacl_one(pacl, &alloc, flags);
if (dpacl)
- _posix_to_nfsv4_one(dpacl, *acl, flags | NFS4_ACL_TYPE_DEFAULT);
+ _posix_to_richacl_one(dpacl, &alloc, flags | FLAG_DEFAULT_ACL);
+
+ *acl = alloc.acl;
out:
posix_acl_release(dpacl);
@@ -228,21 +232,20 @@ summarize_posix_acl(struct posix_acl *acl, struct posix_acl_summary *pas)
/* We assume the acl has been verified with posix_acl_valid. */
static void
-_posix_to_nfsv4_one(struct posix_acl *pacl, struct nfs4_acl *acl,
- unsigned int flags)
+_posix_to_richacl_one(struct posix_acl *pacl, struct richacl_alloc *alloc,
+ unsigned int flags)
{
struct posix_acl_entry *pa, *group_owner_entry;
- struct nfs4_ace *ace;
+ struct richace *ace;
struct posix_acl_summary pas;
unsigned short deny;
- int eflag = ((flags & NFS4_ACL_TYPE_DEFAULT) ?
- NFS4_INHERITANCE_FLAGS | NFS4_ACE_INHERIT_ONLY_ACE : 0);
+ int e_flags = ((flags & FLAG_DEFAULT_ACL) ?
+ RICHACE_INHERITANCE_FLAGS | RICHACE_INHERIT_ONLY_ACE : 0);
BUG_ON(pacl->a_count < 3);
summarize_posix_acl(pacl, &pas);
pa = pacl->a_entries;
- ace = acl->aces + acl->naces;
/* We could deny everything not granted by the owner: */
deny = ~pas.owner;
@@ -252,42 +255,35 @@ _posix_to_nfsv4_one(struct posix_acl *pacl, struct nfs4_acl *acl,
*/
deny &= pas.users | pas.group | pas.groups | pas.other;
if (deny) {
- ace->type = NFS4_ACE_ACCESS_DENIED_ACE_TYPE;
- ace->flag = eflag;
- ace->access_mask = deny_mask_from_posix(deny, flags);
- ace->whotype = NFS4_ACL_WHO_OWNER;
- ace++;
- acl->naces++;
+ ace = richacl_append_entry(alloc);
+ ace->e_type = RICHACE_ACCESS_DENIED_ACE_TYPE;
+ ace->e_flags = e_flags | RICHACE_SPECIAL_WHO;
+ ace->e_mask = deny_mask_from_posix(deny, flags);
+ ace->e_id.special = RICHACE_OWNER_SPECIAL_ID;
}
- ace->type = NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE;
- ace->flag = eflag;
- ace->access_mask = mask_from_posix(pa->e_perm, flags | NFS4_ACL_OWNER);
- ace->whotype = NFS4_ACL_WHO_OWNER;
- ace++;
- acl->naces++;
+ ace = richacl_append_entry(alloc);
+ ace->e_type = RICHACE_ACCESS_ALLOWED_ACE_TYPE;
+ ace->e_flags = e_flags | RICHACE_SPECIAL_WHO;
+ ace->e_mask = mask_from_posix(pa->e_perm, flags | FLAG_OWNER);
+ ace->e_id.special = RICHACE_OWNER_SPECIAL_ID;
pa++;
while (pa->e_tag == ACL_USER) {
deny = ~(pa->e_perm & pas.mask);
deny &= pas.groups | pas.group | pas.other;
if (deny) {
- ace->type = NFS4_ACE_ACCESS_DENIED_ACE_TYPE;
- ace->flag = eflag;
- ace->access_mask = deny_mask_from_posix(deny, flags);
- ace->whotype = NFS4_ACL_WHO_NAMED;
- ace->who_uid = pa->e_uid;
- ace++;
- acl->naces++;
+ ace = richacl_append_entry(alloc);
+ ace->e_type = RICHACE_ACCESS_DENIED_ACE_TYPE;
+ ace->e_flags = e_flags;
+ ace->e_mask = deny_mask_from_posix(deny, flags);
+ ace->e_id.uid = pa->e_uid;
}
- ace->type = NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE;
- ace->flag = eflag;
- ace->access_mask = mask_from_posix(pa->e_perm & pas.mask,
- flags);
- ace->whotype = NFS4_ACL_WHO_NAMED;
- ace->who_uid = pa->e_uid;
- ace++;
- acl->naces++;
+ ace = richacl_append_entry(alloc);
+ ace->e_type = RICHACE_ACCESS_ALLOWED_ACE_TYPE;
+ ace->e_flags = e_flags;
+ ace->e_mask = mask_from_posix(pa->e_perm & pas.mask, flags);
+ ace->e_id.uid = pa->e_uid;
pa++;
}
@@ -298,23 +294,19 @@ _posix_to_nfsv4_one(struct posix_acl *pacl, struct nfs4_acl *acl,
group_owner_entry = pa;
- ace->type = NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE;
- ace->flag = eflag;
- ace->access_mask = mask_from_posix(pas.group, flags);
- ace->whotype = NFS4_ACL_WHO_GROUP;
- ace++;
- acl->naces++;
+ ace = richacl_append_entry(alloc);
+ ace->e_type = RICHACE_ACCESS_ALLOWED_ACE_TYPE;
+ ace->e_flags = e_flags | RICHACE_SPECIAL_WHO;
+ ace->e_mask = mask_from_posix(pas.group, flags);
+ ace->e_id.special = RICHACE_GROUP_SPECIAL_ID;
pa++;
while (pa->e_tag == ACL_GROUP) {
- ace->type = NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE;
- ace->flag = eflag | NFS4_ACE_IDENTIFIER_GROUP;
- ace->access_mask = mask_from_posix(pa->e_perm & pas.mask,
- flags);
- ace->whotype = NFS4_ACL_WHO_NAMED;
- ace->who_gid = pa->e_gid;
- ace++;
- acl->naces++;
+ ace = richacl_append_entry(alloc);
+ ace->e_type = RICHACE_ACCESS_ALLOWED_ACE_TYPE;
+ ace->e_flags = e_flags | RICHACE_IDENTIFIER_GROUP;
+ ace->e_mask = mask_from_posix(pa->e_perm & pas.mask, flags);
+ ace->e_id.gid = pa->e_gid;
pa++;
}
@@ -324,12 +316,11 @@ _posix_to_nfsv4_one(struct posix_acl *pacl, struct nfs4_acl *acl,
deny = ~pas.group & pas.other;
if (deny) {
- ace->type = NFS4_ACE_ACCESS_DENIED_ACE_TYPE;
- ace->flag = eflag;
- ace->access_mask = deny_mask_from_posix(deny, flags);
- ace->whotype = NFS4_ACL_WHO_GROUP;
- ace++;
- acl->naces++;
+ ace = richacl_append_entry(alloc);
+ ace->e_type = RICHACE_ACCESS_DENIED_ACE_TYPE;
+ ace->e_flags = e_flags | RICHACE_SPECIAL_WHO;
+ ace->e_mask = deny_mask_from_posix(deny, flags);
+ ace->e_id.special = RICHACE_GROUP_SPECIAL_ID;
}
pa++;
@@ -337,24 +328,22 @@ _posix_to_nfsv4_one(struct posix_acl *pacl, struct nfs4_acl *acl,
deny = ~(pa->e_perm & pas.mask);
deny &= pas.other;
if (deny) {
- ace->type = NFS4_ACE_ACCESS_DENIED_ACE_TYPE;
- ace->flag = eflag | NFS4_ACE_IDENTIFIER_GROUP;
- ace->access_mask = deny_mask_from_posix(deny, flags);
- ace->whotype = NFS4_ACL_WHO_NAMED;
- ace->who_gid = pa->e_gid;
- ace++;
- acl->naces++;
+ ace = richacl_append_entry(alloc);
+ ace->e_type = RICHACE_ACCESS_DENIED_ACE_TYPE;
+ ace->e_flags = e_flags | RICHACE_IDENTIFIER_GROUP;
+ ace->e_mask = deny_mask_from_posix(deny, flags);
+ ace->e_id.gid = pa->e_gid;
}
pa++;
}
if (pa->e_tag == ACL_MASK)
pa++;
- ace->type = NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE;
- ace->flag = eflag;
- ace->access_mask = mask_from_posix(pa->e_perm, flags);
- ace->whotype = NFS4_ACL_WHO_EVERYONE;
- acl->naces++;
+ ace = richacl_append_entry(alloc);
+ ace->e_type = RICHACE_ACCESS_ALLOWED_ACE_TYPE;
+ ace->e_flags = e_flags | RICHACE_SPECIAL_WHO;
+ ace->e_mask = mask_from_posix(pa->e_perm, flags);
+ ace->e_id.special = RICHACE_EVERYONE_SPECIAL_ID;
}
static bool
@@ -498,7 +487,7 @@ posix_state_to_acl(struct posix_acl_state *state, unsigned int flags)
* and effective cases: when there are no inheritable ACEs,
* calls ->set_acl with a NULL ACL structure.
*/
- if (state->empty && (flags & NFS4_ACL_TYPE_DEFAULT))
+ if (state->empty && (flags & FLAG_DEFAULT_ACL))
return NULL;
/*
@@ -617,24 +606,24 @@ static void allow_bits_array(struct posix_ace_state_array *a, u32 mask)
}
static void process_one_v4_ace(struct posix_acl_state *state,
- struct nfs4_ace *ace)
+ struct richace *ace)
{
- u32 mask = ace->access_mask;
+ u32 mask = ace->e_mask;
int i;
state->empty = 0;
switch (ace2type(ace)) {
case ACL_USER_OBJ:
- if (ace->type == NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE) {
+ if (ace->e_type == RICHACE_ACCESS_ALLOWED_ACE_TYPE) {
allow_bits(&state->owner, mask);
} else {
deny_bits(&state->owner, mask);
}
break;
case ACL_USER:
- i = find_uid(state, ace->who_uid);
- if (ace->type == NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE) {
+ i = find_uid(state, ace->e_id.uid);
+ if (ace->e_type == RICHACE_ACCESS_ALLOWED_ACE_TYPE) {
allow_bits(&state->users->aces[i].perms, mask);
} else {
deny_bits(&state->users->aces[i].perms, mask);
@@ -643,7 +632,7 @@ static void process_one_v4_ace(struct posix_acl_state *state,
}
break;
case ACL_GROUP_OBJ:
- if (ace->type == NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE) {
+ if (ace->e_type == RICHACE_ACCESS_ALLOWED_ACE_TYPE) {
allow_bits(&state->group, mask);
} else {
deny_bits(&state->group, mask);
@@ -655,8 +644,8 @@ static void process_one_v4_ace(struct posix_acl_state *state,
}
break;
case ACL_GROUP:
- i = find_gid(state, ace->who_gid);
- if (ace->type == NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE) {
+ i = find_gid(state, ace->e_id.gid);
+ if (ace->e_type == RICHACE_ACCESS_ALLOWED_ACE_TYPE) {
allow_bits(&state->groups->aces[i].perms, mask);
} else {
deny_bits(&state->groups->aces[i].perms, mask);
@@ -669,7 +658,7 @@ static void process_one_v4_ace(struct posix_acl_state *state,
}
break;
case ACL_OTHER:
- if (ace->type == NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE) {
+ if (ace->e_type == RICHACE_ACCESS_ALLOWED_ACE_TYPE) {
allow_bits(&state->owner, mask);
allow_bits(&state->group, mask);
allow_bits(&state->other, mask);
@@ -687,32 +676,32 @@ static void process_one_v4_ace(struct posix_acl_state *state,
}
}
-static int nfs4_acl_nfsv4_to_posix(struct nfs4_acl *acl,
+static int nfs4_richacl_to_posix(struct richacl *acl,
struct posix_acl **pacl, struct posix_acl **dpacl,
unsigned int flags)
{
struct posix_acl_state effective_acl_state, default_acl_state;
- struct nfs4_ace *ace;
+ struct richace *ace;
int ret;
- ret = init_state(&effective_acl_state, acl->naces);
+ ret = init_state(&effective_acl_state, acl->a_count);
if (ret)
return ret;
- ret = init_state(&default_acl_state, acl->naces);
+ ret = init_state(&default_acl_state, acl->a_count);
if (ret)
goto out_estate;
ret = -EINVAL;
- for (ace = acl->aces; ace < acl->aces + acl->naces; ace++) {
- if (ace->type != NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE &&
- ace->type != NFS4_ACE_ACCESS_DENIED_ACE_TYPE)
+ richacl_for_each_entry(ace, acl) {
+ if (ace->e_type != RICHACE_ACCESS_ALLOWED_ACE_TYPE &&
+ ace->e_type != RICHACE_ACCESS_DENIED_ACE_TYPE)
goto out_dstate;
- if (ace->flag & ~NFS4_SUPPORTED_FLAGS)
+ if (ace->e_flags & ~RICHACE_SUPPORTED_FLAGS)
goto out_dstate;
- if ((ace->flag & NFS4_INHERITANCE_FLAGS) == 0) {
+ if ((ace->e_flags & RICHACE_INHERITANCE_FLAGS) == 0) {
process_one_v4_ace(&effective_acl_state, ace);
continue;
}
- if (!(flags & NFS4_ACL_DIR))
+ if (!(flags & FLAG_DIRECTORY))
goto out_dstate;
/*
* Note that when only one of FILE_INHERIT or DIRECTORY_INHERIT
@@ -721,7 +710,7 @@ static int nfs4_acl_nfsv4_to_posix(struct nfs4_acl *acl,
*/
process_one_v4_ace(&default_acl_state, ace);
- if (!(ace->flag & NFS4_ACE_INHERIT_ONLY_ACE))
+ if (!(ace->e_flags & RICHACE_INHERIT_ONLY_ACE))
process_one_v4_ace(&effective_acl_state, ace);
}
*pacl = posix_state_to_acl(&effective_acl_state, flags);
@@ -731,7 +720,7 @@ static int nfs4_acl_nfsv4_to_posix(struct nfs4_acl *acl,
goto out_dstate;
}
*dpacl = posix_state_to_acl(&default_acl_state,
- flags | NFS4_ACL_TYPE_DEFAULT);
+ flags | FLAG_DEFAULT_ACL);
if (IS_ERR(*dpacl)) {
ret = PTR_ERR(*dpacl);
*dpacl = NULL;
@@ -750,8 +739,7 @@ out_estate:
}
__be32
-nfsd4_set_nfs4_acl(struct svc_rqst *rqstp, struct svc_fh *fhp,
- struct nfs4_acl *acl)
+nfsd4_set_acl(struct svc_rqst *rqstp, struct svc_fh *fhp, struct richacl *acl)
{
__be32 error;
int host_error;
@@ -772,9 +760,9 @@ nfsd4_set_nfs4_acl(struct svc_rqst *rqstp, struct svc_fh *fhp,
return nfserr_attrnotsupp;
if (S_ISDIR(inode->i_mode))
- flags = NFS4_ACL_DIR;
+ flags = FLAG_DIRECTORY;
- host_error = nfs4_acl_nfsv4_to_posix(acl, &pacl, &dpacl, flags);
+ host_error = nfs4_richacl_to_posix(acl, &pacl, &dpacl, flags);
if (host_error == -EINVAL)
return nfserr_attrnotsupp;
if (host_error < 0)
@@ -801,82 +789,62 @@ out_nfserr:
static short
-ace2type(struct nfs4_ace *ace)
+ace2type(struct richace *ace)
{
- switch (ace->whotype) {
- case NFS4_ACL_WHO_NAMED:
- return (ace->flag & NFS4_ACE_IDENTIFIER_GROUP ?
- ACL_GROUP : ACL_USER);
- case NFS4_ACL_WHO_OWNER:
- return ACL_USER_OBJ;
- case NFS4_ACL_WHO_GROUP:
- return ACL_GROUP_OBJ;
- case NFS4_ACL_WHO_EVERYONE:
- return ACL_OTHER;
+ if (ace->e_flags & RICHACE_SPECIAL_WHO) {
+ switch(ace->e_id.special) {
+ case RICHACE_OWNER_SPECIAL_ID:
+ return ACL_USER_OBJ;
+ case RICHACE_GROUP_SPECIAL_ID:
+ return ACL_GROUP_OBJ;
+ case RICHACE_EVERYONE_SPECIAL_ID:
+ return ACL_OTHER;
+ default:
+ BUG();
+ }
}
- BUG();
- return -1;
+ return ace->e_flags & RICHACE_IDENTIFIER_GROUP ? ACL_GROUP : ACL_USER;
}
-/*
- * return the size of the struct nfs4_acl required to represent an acl
- * with @entries entries.
- */
-int nfs4_acl_bytes(int entries)
+__be32 nfsd4_decode_ace_who(struct richace *ace, struct svc_rqst *rqstp,
+ char *who, u32 len)
{
- return sizeof(struct nfs4_acl) + entries * sizeof(struct nfs4_ace);
-}
-
-static struct {
- char *string;
- int stringlen;
- int type;
-} s2t_map[] = {
- {
- .string = "OWNER@",
- .stringlen = sizeof("OWNER@") - 1,
- .type = NFS4_ACL_WHO_OWNER,
- },
- {
- .string = "GROUP@",
- .stringlen = sizeof("GROUP@") - 1,
- .type = NFS4_ACL_WHO_GROUP,
- },
- {
- .string = "EVERYONE@",
- .stringlen = sizeof("EVERYONE@") - 1,
- .type = NFS4_ACL_WHO_EVERYONE,
- },
-};
-
-int
-nfs4_acl_get_whotype(char *p, u32 len)
-{
- int i;
-
- for (i = 0; i < ARRAY_SIZE(s2t_map); i++) {
- if (s2t_map[i].stringlen == len &&
- 0 == memcmp(s2t_map[i].string, p, len))
- return s2t_map[i].type;
+ int special_id;
+
+ special_id = nfs4acl_who_to_special_id(who, len);
+ if (special_id >= 0) {
+ ace->e_flags |= RICHACE_SPECIAL_WHO;
+ ace->e_flags &= ~RICHACE_IDENTIFIER_GROUP;
+ ace->e_id.special = special_id;
+ return nfs_ok;
}
- return NFS4_ACL_WHO_NAMED;
+ if (ace->e_flags & RICHACE_IDENTIFIER_GROUP)
+ return nfsd_map_name_to_gid(rqstp, who, len, &ace->e_id.gid);
+ else
+ return nfsd_map_name_to_uid(rqstp, who, len, &ace->e_id.uid);
}
-__be32 nfs4_acl_write_who(struct xdr_stream *xdr, int who)
+__be32 nfsd4_encode_ace_who(struct xdr_stream *xdr, struct svc_rqst *rqstp,
+ struct richace *ace)
{
- __be32 *p;
- int i;
-
- for (i = 0; i < ARRAY_SIZE(s2t_map); i++) {
- if (s2t_map[i].type != who)
- continue;
- p = xdr_reserve_space(xdr, s2t_map[i].stringlen + 4);
+ if (ace->e_flags & RICHACE_SPECIAL_WHO) {
+ unsigned int special_id = ace->e_id.special;
+ const char *who;
+ unsigned int len;
+ __be32 *p;
+
+ if (!nfs4acl_special_id_to_who(special_id, &who, &len)) {
+ WARN_ON_ONCE(1);
+ return nfserr_serverfault;
+ }
+ p = xdr_reserve_space(xdr, len + 4);
if (!p)
return nfserr_resource;
- p = xdr_encode_opaque(p, s2t_map[i].string,
- s2t_map[i].stringlen);
+ p = xdr_encode_opaque(p, who, len);
return 0;
}
- WARN_ON_ONCE(1);
- return nfserr_serverfault;
+ if (ace->e_flags & RICHACE_IDENTIFIER_GROUP)
+ return nfsd4_encode_group(xdr, rqstp, ace->e_id.gid);
+ else
+ return nfsd4_encode_user(xdr, rqstp, ace->e_id.uid);
}
diff --git a/fs/nfsd/nfs4proc.c b/fs/nfsd/nfs4proc.c
index 90cfda7..8c2cb16 100644
--- a/fs/nfsd/nfs4proc.c
+++ b/fs/nfsd/nfs4proc.c
@@ -159,12 +159,12 @@ is_create_with_attrs(struct nfsd4_open *open)
* in the returned attr bitmap.
*/
static void
-do_set_nfs4_acl(struct svc_rqst *rqstp, struct svc_fh *fhp,
- struct nfs4_acl *acl, u32 *bmval)
+do_set_acl(struct svc_rqst *rqstp, struct svc_fh *fhp, struct richacl *acl,
+ u32 *bmval)
{
__be32 status;
- status = nfsd4_set_nfs4_acl(rqstp, fhp, acl);
+ status = nfsd4_set_acl(rqstp, fhp, acl);
if (status)
/*
* We should probably fail the whole open at this point,
@@ -299,7 +299,7 @@ do_open_lookup(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, stru
goto out;
if (is_create_with_attrs(open) && open->op_acl != NULL)
- do_set_nfs4_acl(rqstp, *resfh, open->op_acl, open->op_bmval);
+ do_set_acl(rqstp, *resfh, open->op_acl, open->op_bmval);
nfsd4_set_open_owner_reply_cache(cstate, open, *resfh);
accmode = NFSD_MAY_NOP;
@@ -674,8 +674,7 @@ nfsd4_create(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
nfsd4_security_inode_setsecctx(&resfh, &create->cr_label, create->cr_bmval);
if (create->cr_acl != NULL)
- do_set_nfs4_acl(rqstp, &resfh, create->cr_acl,
- create->cr_bmval);
+ do_set_acl(rqstp, &resfh, create->cr_acl, create->cr_bmval);
fh_unlock(&cstate->current_fh);
set_change_info(&create->cr_cinfo, &cstate->current_fh);
@@ -940,8 +939,8 @@ nfsd4_setattr(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
goto out;
if (setattr->sa_acl != NULL)
- status = nfsd4_set_nfs4_acl(rqstp, &cstate->current_fh,
- setattr->sa_acl);
+ status = nfsd4_set_acl(rqstp, &cstate->current_fh,
+ setattr->sa_acl);
if (status)
goto out;
if (setattr->sa_label.len)
diff --git a/fs/nfsd/nfs4xdr.c b/fs/nfsd/nfs4xdr.c
index 819a670..e66e261 100644
--- a/fs/nfsd/nfs4xdr.c
+++ b/fs/nfsd/nfs4xdr.c
@@ -303,7 +303,7 @@ nfsd4_decode_bitmap(struct nfsd4_compoundargs *argp, u32 *bmval)
static __be32
nfsd4_decode_fattr(struct nfsd4_compoundargs *argp, u32 *bmval,
- struct iattr *iattr, struct nfs4_acl **acl,
+ struct iattr *iattr, struct richacl **acl,
struct xdr_netobj *label)
{
int expected_len, len = 0;
@@ -326,38 +326,31 @@ nfsd4_decode_fattr(struct nfsd4_compoundargs *argp, u32 *bmval,
}
if (bmval[0] & FATTR4_WORD0_ACL) {
u32 nace;
- struct nfs4_ace *ace;
+ struct richace *ace;
READ_BUF(4); len += 4;
nace = be32_to_cpup(p++);
- if (nace > NFS4_ACL_MAX)
+ if (nace > NFSD4_ACL_MAX)
return nfserr_fbig;
- *acl = svcxdr_tmpalloc(argp, nfs4_acl_bytes(nace));
+ *acl = svcxdr_alloc_richacl(argp, nace);
if (*acl == NULL)
return nfserr_jukebox;
- (*acl)->naces = nace;
- for (ace = (*acl)->aces; ace < (*acl)->aces + nace; ace++) {
+ richacl_for_each_entry(ace, *acl) {
READ_BUF(16); len += 16;
- ace->type = be32_to_cpup(p++);
- ace->flag = be32_to_cpup(p++);
- ace->access_mask = be32_to_cpup(p++);
+ ace->e_type = be32_to_cpup(p++);
+ ace->e_flags = be32_to_cpup(p++);
+ ace->e_mask = be32_to_cpup(p++);
+ if (ace->e_flags & RICHACE_SPECIAL_WHO)
+ return nfserr_inval;
dummy32 = be32_to_cpup(p++);
READ_BUF(dummy32);
len += XDR_QUADLEN(dummy32) << 2;
READMEM(buf, dummy32);
- ace->whotype = nfs4_acl_get_whotype(buf, dummy32);
- status = nfs_ok;
- if (ace->whotype != NFS4_ACL_WHO_NAMED)
- ;
- else if (ace->flag & NFS4_ACE_IDENTIFIER_GROUP)
- status = nfsd_map_name_to_gid(argp->rqstp,
- buf, dummy32, &ace->who_gid);
- else
- status = nfsd_map_name_to_uid(argp->rqstp,
- buf, dummy32, &ace->who_uid);
+ status = nfsd4_decode_ace_who(ace, argp->rqstp,
+ buf, dummy32);
if (status)
return status;
}
@@ -2147,18 +2140,6 @@ static u32 nfs4_file_type(umode_t mode)
};
}
-static inline __be32
-nfsd4_encode_aclname(struct xdr_stream *xdr, struct svc_rqst *rqstp,
- struct nfs4_ace *ace)
-{
- if (ace->whotype != NFS4_ACL_WHO_NAMED)
- return nfs4_acl_write_who(xdr, ace->whotype);
- else if (ace->flag & NFS4_ACE_IDENTIFIER_GROUP)
- return nfsd4_encode_group(xdr, rqstp, ace->who_gid);
- else
- return nfsd4_encode_user(xdr, rqstp, ace->who_uid);
-}
-
#define WORD0_ABSENT_FS_ATTRS (FATTR4_WORD0_FS_LOCATIONS | FATTR4_WORD0_FSID | \
FATTR4_WORD0_RDATTR_ERROR)
#define WORD1_ABSENT_FS_ATTRS FATTR4_WORD1_MOUNTED_ON_FILEID
@@ -2247,7 +2228,7 @@ nfsd4_encode_fattr(struct xdr_stream *xdr, struct svc_fh *fhp,
u32 rdattr_err = 0;
__be32 status;
int err;
- struct nfs4_acl *acl = NULL;
+ struct richacl *acl = NULL;
void *context = NULL;
int contextlen;
bool contextsupport = false;
@@ -2468,7 +2449,7 @@ nfsd4_encode_fattr(struct xdr_stream *xdr, struct svc_fh *fhp,
*p++ = cpu_to_be32(rdattr_err);
}
if (bmval0 & FATTR4_WORD0_ACL) {
- struct nfs4_ace *ace;
+ struct richace *ace;
if (acl == NULL) {
p = xdr_reserve_space(xdr, 4);
@@ -2481,17 +2462,16 @@ nfsd4_encode_fattr(struct xdr_stream *xdr, struct svc_fh *fhp,
p = xdr_reserve_space(xdr, 4);
if (!p)
goto out_resource;
- *p++ = cpu_to_be32(acl->naces);
+ *p++ = cpu_to_be32(acl->a_count);
- for (ace = acl->aces; ace < acl->aces + acl->naces; ace++) {
+ richacl_for_each_entry(ace, acl) {
p = xdr_reserve_space(xdr, 4*3);
if (!p)
goto out_resource;
- *p++ = cpu_to_be32(ace->type);
- *p++ = cpu_to_be32(ace->flag);
- *p++ = cpu_to_be32(ace->access_mask &
- NFS4_ACE_MASK_ALL);
- status = nfsd4_encode_aclname(xdr, rqstp, ace);
+ *p++ = cpu_to_be32(ace->e_type);
+ *p++ = cpu_to_be32(ace->e_flags & ~RICHACE_SPECIAL_WHO);
+ *p++ = cpu_to_be32(ace->e_mask & NFS4_ACE_MASK_ALL);
+ status = nfsd4_encode_ace_who(xdr, rqstp, ace);
if (status)
goto out;
}
@@ -2754,7 +2734,7 @@ out:
if (context)
security_release_secctx(context, contextlen);
#endif /* CONFIG_NFSD_V4_SECURITY_LABEL */
- kfree(acl);
+ richacl_put(acl);
if (tempfh) {
fh_put(tempfh);
kfree(tempfh);
diff --git a/fs/nfsd/xdr4.h b/fs/nfsd/xdr4.h
index b698585..c311066 100644
--- a/fs/nfsd/xdr4.h
+++ b/fs/nfsd/xdr4.h
@@ -118,7 +118,7 @@ struct nfsd4_create {
u32 cr_bmval[3]; /* request */
struct iattr cr_iattr; /* request */
struct nfsd4_change_info cr_cinfo; /* response */
- struct nfs4_acl *cr_acl;
+ struct richacl *cr_acl;
struct xdr_netobj cr_label;
};
#define cr_datalen u.link.datalen
@@ -248,7 +248,7 @@ struct nfsd4_open {
struct nfs4_file *op_file; /* used during processing */
struct nfs4_ol_stateid *op_stp; /* used during processing */
struct nfs4_clnt_odstate *op_odstate; /* used during processing */
- struct nfs4_acl *op_acl;
+ struct richacl *op_acl;
struct xdr_netobj op_label;
};
@@ -332,7 +332,7 @@ struct nfsd4_setattr {
stateid_t sa_stateid; /* request */
u32 sa_bmval[3]; /* request */
struct iattr sa_iattr; /* request */
- struct nfs4_acl *sa_acl;
+ struct richacl *sa_acl;
struct xdr_netobj sa_label;
};
diff --git a/include/linux/nfs4.h b/include/linux/nfs4.h
index b8e72aa..992ddc4 100644
--- a/include/linux/nfs4.h
+++ b/include/linux/nfs4.h
@@ -16,29 +16,6 @@
#include <linux/uidgid.h>
#include <uapi/linux/nfs4.h>
-enum nfs4_acl_whotype {
- NFS4_ACL_WHO_NAMED = 0,
- NFS4_ACL_WHO_OWNER,
- NFS4_ACL_WHO_GROUP,
- NFS4_ACL_WHO_EVERYONE,
-};
-
-struct nfs4_ace {
- uint32_t type;
- uint32_t flag;
- uint32_t access_mask;
- int whotype;
- union {
- kuid_t who_uid;
- kgid_t who_gid;
- };
-};
-
-struct nfs4_acl {
- uint32_t naces;
- struct nfs4_ace aces[0];
-};
-
#define NFS4_MAXLABELLEN 2048
struct nfs4_label {
diff --git a/include/linux/nfs4acl.h b/include/linux/nfs4acl.h
new file mode 100644
index 0000000..db9f9a6
--- /dev/null
+++ b/include/linux/nfs4acl.h
@@ -0,0 +1,7 @@
+#ifndef __LINUX_NFS4ACL_H
+#define __LINUX_NFS4ACL_H
+
+int nfs4acl_who_to_special_id(const char *, u32);
+bool nfs4acl_special_id_to_who(unsigned int, const char **, unsigned int *);
+
+#endif
--
2.4.3
^ permalink raw reply related
* [PATCH v5 28/39] nfsd: Keep list of acls to dispose of in compoundargs
From: Andreas Gruenbacher @ 2015-07-22 13:03 UTC (permalink / raw)
To: linux-kernel
Cc: linux-fsdevel, linux-nfs, linux-api, samba-technical,
linux-security-module, Andreas Gruenbacher
In-Reply-To: <1437570209-29832-1-git-send-email-andreas.gruenbacher@gmail.com>
From: Andreas Gruenbacher <agruenba@redhat.com>
We will decode acls in requests into richacls. Even if unlikely, there can be
more than one acl in a single request; those richacls need to be richacl_put()
at the end of the request instead of kfree()d, so keep a list of acls in
compoundargs for that.
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
---
fs/nfsd/nfs4xdr.c | 26 ++++++++++++++++++++++++++
fs/nfsd/xdr4.h | 6 ++++++
2 files changed, 32 insertions(+)
diff --git a/fs/nfsd/nfs4xdr.c b/fs/nfsd/nfs4xdr.c
index 5463385..819a670 100644
--- a/fs/nfsd/nfs4xdr.c
+++ b/fs/nfsd/nfs4xdr.c
@@ -40,6 +40,7 @@
#include <linux/utsname.h>
#include <linux/pagemap.h>
#include <linux/sunrpc/svcauth_gss.h>
+#include <linux/richacl.h>
#include "idmap.h"
#include "acl.h"
@@ -196,6 +197,24 @@ svcxdr_tmpalloc(struct nfsd4_compoundargs *argp, u32 len)
return tb->buf;
}
+static struct richacl *
+svcxdr_alloc_richacl(struct nfsd4_compoundargs *argp, u32 nace)
+{
+ struct svcxdr_richacl *acls;
+
+ acls = kmalloc(sizeof(*acls), GFP_KERNEL);
+ if (!acls)
+ return NULL;
+ acls->acl = richacl_alloc(nace, GFP_KERNEL);
+ if (!acls->acl) {
+ kfree(acls);
+ return NULL;
+ }
+ acls->next = argp->acls;
+ argp->acls = acls;
+ return acls->acl;
+}
+
/*
* For xdr strings that need to be passed to other kernel api's
* as null-terminated strings.
@@ -4394,6 +4413,12 @@ int nfsd4_release_compoundargs(void *rq, __be32 *p, void *resp)
args->to_free = tb->next;
kfree(tb);
}
+ while (args->acls) {
+ struct svcxdr_richacl *acls = args->acls;
+ args->acls = acls->next;
+ richacl_put(acls->acl);
+ kfree(acls);
+ }
return 1;
}
@@ -4412,6 +4437,7 @@ nfs4svc_decode_compoundargs(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_comp
args->pagelen = rqstp->rq_arg.page_len;
args->tmpp = NULL;
args->to_free = NULL;
+ args->acls = NULL;
args->ops = args->iops;
args->rqstp = rqstp;
diff --git a/fs/nfsd/xdr4.h b/fs/nfsd/xdr4.h
index 9f99100..b698585 100644
--- a/fs/nfsd/xdr4.h
+++ b/fs/nfsd/xdr4.h
@@ -570,6 +570,11 @@ struct svcxdr_tmpbuf {
char buf[];
};
+struct svcxdr_richacl {
+ struct svcxdr_richacl *next;
+ struct richacl *acl;
+};
+
struct nfsd4_compoundargs {
/* scratch variables for XDR decode */
__be32 * p;
@@ -579,6 +584,7 @@ struct nfsd4_compoundargs {
__be32 tmp[8];
__be32 * tmpp;
struct svcxdr_tmpbuf *to_free;
+ struct svcxdr_richacl *acls;
struct svc_rqst *rqstp;
--
2.4.3
^ permalink raw reply related
* [PATCH v5 27/39] richacl: Create richacl from mode values
From: Andreas Gruenbacher @ 2015-07-22 13:03 UTC (permalink / raw)
To: linux-kernel
Cc: linux-fsdevel, linux-nfs, linux-api, samba-technical,
linux-security-module, Andreas Gruenbacher
In-Reply-To: <1437570209-29832-1-git-send-email-andreas.gruenbacher@gmail.com>
From: Andreas Gruenbacher <agruenba@redhat.com>
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
---
fs/richacl_compat.c | 88 +++++++++++++++++++++++++++++++++++++++++++++++++
include/linux/richacl.h | 1 +
2 files changed, 89 insertions(+)
diff --git a/fs/richacl_compat.c b/fs/richacl_compat.c
index 05219ce..b7d3990 100644
--- a/fs/richacl_compat.c
+++ b/fs/richacl_compat.c
@@ -813,3 +813,91 @@ richacl_apply_masks(struct richacl **acl, kuid_t owner)
return 0;
}
EXPORT_SYMBOL_GPL(richacl_apply_masks);
+
+/**
+ * richacl_from_mode - create an acl which corresponds to @mode
+ *
+ * The resulting acl doesn't have the RICHACL_MASKED flag set.
+ *
+ * @mode: file mode including the file type
+ */
+struct richacl *
+richacl_from_mode(mode_t mode)
+{
+ unsigned int owner_mask = richacl_mode_to_mask(mode >> 6);
+ unsigned int group_mask = richacl_mode_to_mask(mode >> 3);
+ unsigned int other_mask = richacl_mode_to_mask(mode);
+ unsigned int denied;
+ unsigned int entries = 0;
+ struct richacl *acl;
+ struct richace *ace;
+
+ /* RICHACE_DELETE_CHILD is meaningless for non-directories. */
+ if (!S_ISDIR(mode)) {
+ owner_mask &= ~RICHACE_DELETE_CHILD;
+ group_mask &= ~RICHACE_DELETE_CHILD;
+ other_mask &= ~RICHACE_DELETE_CHILD;
+ }
+
+ denied = ~owner_mask & (group_mask | other_mask);
+ if (denied)
+ entries++; /* owner@ deny entry needed */
+ if (owner_mask & ~(group_mask & other_mask))
+ entries++; /* owner@ allow entry needed */
+ denied = ~group_mask & other_mask;
+ if (denied)
+ entries++; /* group@ deny entry needed */
+ if (group_mask & ~other_mask)
+ entries++; /* group@ allow entry needed */
+ if (other_mask)
+ entries++; /* everyone@ allow entry needed */
+
+ acl = richacl_alloc(entries, GFP_KERNEL);
+ if (!acl)
+ return NULL;
+ acl->a_owner_mask = owner_mask;
+ acl->a_group_mask = group_mask;
+ acl->a_other_mask = other_mask;
+ ace = acl->a_entries;
+
+ denied = ~owner_mask & (group_mask | other_mask);
+ if (denied) {
+ ace->e_type = RICHACE_ACCESS_DENIED_ACE_TYPE;
+ ace->e_flags = RICHACE_SPECIAL_WHO;
+ ace->e_mask = denied;
+ ace->e_id.special = RICHACE_OWNER_SPECIAL_ID;
+ ace++;
+ }
+ if (owner_mask & ~(group_mask & other_mask)) {
+ ace->e_type = RICHACE_ACCESS_ALLOWED_ACE_TYPE;
+ ace->e_flags = RICHACE_SPECIAL_WHO;
+ ace->e_mask = owner_mask;
+ ace->e_id.special = RICHACE_OWNER_SPECIAL_ID;
+ ace++;
+ }
+ denied = ~group_mask & other_mask;
+ if (denied) {
+ ace->e_type = RICHACE_ACCESS_DENIED_ACE_TYPE;
+ ace->e_flags = RICHACE_SPECIAL_WHO;
+ ace->e_mask = denied;
+ ace->e_id.special = RICHACE_GROUP_SPECIAL_ID;
+ ace++;
+ }
+ if (group_mask & ~other_mask) {
+ ace->e_type = RICHACE_ACCESS_ALLOWED_ACE_TYPE;
+ ace->e_flags = RICHACE_SPECIAL_WHO;
+ ace->e_mask = group_mask;
+ ace->e_id.special = RICHACE_GROUP_SPECIAL_ID;
+ ace++;
+ }
+ if (other_mask) {
+ ace->e_type = RICHACE_ACCESS_ALLOWED_ACE_TYPE;
+ ace->e_flags = RICHACE_SPECIAL_WHO;
+ ace->e_mask = other_mask;
+ ace->e_id.special = RICHACE_EVERYONE_SPECIAL_ID;
+ ace++;
+ }
+
+ return acl;
+}
+EXPORT_SYMBOL_GPL(richacl_from_mode);
diff --git a/include/linux/richacl.h b/include/linux/richacl.h
index ef23581..eeb5bd9 100644
--- a/include/linux/richacl.h
+++ b/include/linux/richacl.h
@@ -338,5 +338,6 @@ extern struct richacl *richacl_create(struct inode *, struct inode *);
/* richacl_compat.c */
extern int richacl_apply_masks(struct richacl **, kuid_t);
+extern struct richacl *richacl_from_mode(mode_t);
#endif /* __RICHACL_H */
--
2.4.3
^ permalink raw reply related
* [PATCH v5 26/39] richacl: Apply the file masks to a richacl
From: Andreas Gruenbacher @ 2015-07-22 13:03 UTC (permalink / raw)
To: linux-kernel
Cc: linux-fsdevel, linux-nfs, linux-api, samba-technical,
linux-security-module, Andreas Gruenbacher, Andreas Gruenbacher
In-Reply-To: <1437570209-29832-1-git-send-email-andreas.gruenbacher@gmail.com>
From: Andreas Gruenbacher <agruenba@redhat.com>
Put all the pieces of the acl transformation puzzle together for
computing a richacl which has the file masks "applied" so that the
standard nfsv4 access check algorithm can be used on the richacl.
Signed-off-by: Andreas Gruenbacher <agruen@kernel.org>
---
fs/richacl_compat.c | 110 ++++++++++++++++++++++++++++++++++++++++++++++++
include/linux/richacl.h | 3 ++
2 files changed, 113 insertions(+)
diff --git a/fs/richacl_compat.c b/fs/richacl_compat.c
index f18f59c..05219ce 100644
--- a/fs/richacl_compat.c
+++ b/fs/richacl_compat.c
@@ -703,3 +703,113 @@ richacl_isolate_group_class(struct richacl_alloc *alloc)
}
return 0;
}
+
+/**
+ * __richacl_apply_masks - apply the file masks to all aces
+ * @alloc: acl and number of allocated entries
+ *
+ * Apply the owner mask to owner@ aces, the other mask to
+ * everyone@ aces, and the group mask to all other aces.
+ *
+ * The previous transformations have brought the acl into a
+ * form in which applying the masks will not lead to the
+ * accidental loss of permissions anymore.
+ */
+static int
+__richacl_apply_masks(struct richacl_alloc *alloc, kuid_t owner)
+{
+ struct richace *ace;
+
+ richacl_for_each_entry(ace, alloc->acl) {
+ unsigned int mask;
+
+ if (richace_is_inherit_only(ace) || !richace_is_allow(ace) ||
+ richace_is_owner(ace))
+ continue;
+ if (richace_is_unix_user(ace) && uid_eq(owner, ace->e_id.uid))
+ mask = alloc->acl->a_owner_mask;
+ else if (richace_is_everyone(ace))
+ mask = alloc->acl->a_other_mask;
+ else
+ mask = alloc->acl->a_group_mask;
+ if (richace_change_mask(alloc, &ace, ace->e_mask & mask))
+ return -1;
+ }
+ return 0;
+}
+
+/**
+ * richacl_apply_masks - apply the masks to the acl
+ *
+ * Transform @acl so that the standard NFSv4 permission check algorithm (which
+ * is not aware of file masks) will compute the same access decisions as the
+ * richacl permission check algorithm (which looks at the acl and the file
+ * masks).
+ *
+ * This algorithm is split into several steps:
+ *
+ * - Move everyone@ aces to the end of the acl. This simplifies the other
+ * transformations, and allows the everyone@ allow ace at the end of the
+ * acl to eventually allow permissions to the other class only.
+ *
+ * - Propagate everyone@ permissions up the acl. This transformation makes
+ * sure that the owner and group class aces won't lose any permissions when
+ * we apply the other mask to the everyone@ allow ace at the end of the acl.
+ *
+ * - Apply the file masks to all aces.
+ *
+ * - Make sure the owner is granted the owner mask permissions.
+ *
+ * - Make sure everyone is granted the other mask permissions.
+ *
+ * - Make sure that the owner is not granted any permissions beyond the owner
+ * mask from group class aces or from everyone@.
+ *
+ * - Make sure that the group class is not granted any permissions from
+ * everyone@.
+ *
+ * The algorithm is exact except for richacls which cannot be represented as an
+ * acl alone: for example, given this acl:
+ *
+ * group@:rw::allow
+ *
+ * when file masks corresponding to mode 0600 are applied, the owner would only
+ * get rw access if he is a member of the owning group. This algorithm would
+ * produce an empty acl in this case. We fix this case by modifying
+ * richacl_permission() so that the group mask is always applied to group class
+ * aces. With this fix, the owner would not have any access (beyond the
+ * implicit permissions always granted to owners).
+ *
+ * NOTE: Depending on the acl and file masks, this algorithm can increase the
+ * number of aces by almost a factor of three in the worst case. This may make
+ * the acl too large for some purposes.
+ */
+int
+richacl_apply_masks(struct richacl **acl, kuid_t owner)
+{
+ if ((*acl)->a_flags & RICHACL_MASKED) {
+ struct richacl_alloc alloc = {
+ .acl = richacl_clone(*acl, GFP_KERNEL),
+ .count = (*acl)->a_count,
+ };
+ if (!alloc.acl)
+ return -ENOMEM;
+
+ if (richacl_move_everyone_aces_down(&alloc) ||
+ richacl_propagate_everyone(&alloc) ||
+ __richacl_apply_masks(&alloc, owner) ||
+ richacl_set_owner_permissions(&alloc) ||
+ richacl_set_other_permissions(&alloc) ||
+ richacl_isolate_owner_class(&alloc) ||
+ richacl_isolate_group_class(&alloc)) {
+ richacl_put(alloc.acl);
+ return -ENOMEM;
+ }
+
+ alloc.acl->a_flags &= ~RICHACL_MASKED;
+ richacl_put(*acl);
+ *acl = alloc.acl;
+ }
+ return 0;
+}
+EXPORT_SYMBOL_GPL(richacl_apply_masks);
diff --git a/include/linux/richacl.h b/include/linux/richacl.h
index 49d7207..ef23581 100644
--- a/include/linux/richacl.h
+++ b/include/linux/richacl.h
@@ -336,4 +336,7 @@ extern struct richacl *richacl_inherit(const struct richacl *, int);
extern int richacl_permission(struct inode *, const struct richacl *, int);
extern struct richacl *richacl_create(struct inode *, struct inode *);
+/* richacl_compat.c */
+extern int richacl_apply_masks(struct richacl **, kuid_t);
+
#endif /* __RICHACL_H */
--
2.4.3
^ permalink raw reply related
* [PATCH v5 25/39] richacl: Isolate the owner and group classes
From: Andreas Gruenbacher @ 2015-07-22 13:03 UTC (permalink / raw)
To: linux-kernel
Cc: linux-fsdevel, linux-nfs, linux-api, samba-technical,
linux-security-module, Andreas Gruenbacher, Andreas Gruenbacher
In-Reply-To: <1437570209-29832-1-git-send-email-andreas.gruenbacher@gmail.com>
From: Andreas Gruenbacher <agruenba@redhat.com>
When applying the file masks to an acl, we need to ensure that no
process gets more permissions than allowed by its file mask.
This may require inserting an owner@ deny ace to ensure this if the
owner mask contains fewer permissions than the group or other mask. For
example, when applying mode 0466 to the following acl:
everyone@:rw::allow
A deny ace needs to be inserted so that the owner won't get elevated
write access:
owner@:w::deny
everyone@:rw::allow
Likewise, we may need to insert group class deny aces if the group mask
contains fewer permissions than the other mask. For example, when
applying mode 0646 to the following acl:
owner@:rw::allow
everyone@:rw::allow
A deny ace needs to be inserted so that the owning group won't get
elevated write access:
owner@:rw::allow
group@:w::deny
everyone@:rw::allow
Signed-off-by: Andreas Gruenbacher <agruen@kernel.org>
---
fs/richacl_compat.c | 229 ++++++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 229 insertions(+)
diff --git a/fs/richacl_compat.c b/fs/richacl_compat.c
index 438859c..f18f59c 100644
--- a/fs/richacl_compat.c
+++ b/fs/richacl_compat.c
@@ -474,3 +474,232 @@ richacl_set_other_permissions(struct richacl_alloc *alloc)
richace_change_mask(alloc, &ace, other_mask);
return 0;
}
+
+/**
+ * richacl_max_allowed - maximum permissions that anybody is allowed
+ */
+static unsigned int
+richacl_max_allowed(struct richacl *acl)
+{
+ struct richace *ace;
+ unsigned int allowed = 0;
+
+ richacl_for_each_entry_reverse(ace, acl) {
+ if (richace_is_inherit_only(ace))
+ continue;
+ if (richace_is_allow(ace))
+ allowed |= ace->e_mask;
+ else if (richace_is_deny(ace)) {
+ if (richace_is_everyone(ace))
+ allowed &= ~ace->e_mask;
+ }
+ }
+ return allowed;
+}
+
+/**
+ * richacl_isolate_owner_class - limit the owner class to the owner file mask
+ * @alloc: acl and number of allocated entries
+ *
+ * POSIX requires that after a chmod, the owner class is granted no more
+ * permissions than the owner file permission bits. For richacls, this
+ * means that the owner class must not be granted any permissions that the
+ * owner mask does not include.
+ *
+ * When we apply file masks to an acl which grant more permissions to the group
+ * or other class than to the owner class, we may end up in a situation where
+ * the owner is granted additional permissions from other aces. For example,
+ * given this acl:
+ *
+ * everyone:rwx::allow
+ *
+ * when file masks corresponding to mode 0466 are applied, after
+ * richacl_propagate_everyone() and __richacl_apply_masks(), we end up with:
+ *
+ * owner@:r::allow
+ * everyone@:rw::allow
+ *
+ * This acl still grants the owner rw access through the everyone@ allow ace.
+ * To fix this, we must deny the owner w access:
+ *
+ * owner@:w::deny
+ * owner@:r::allow
+ * everyone@:rw::allow
+ */
+static int
+richacl_isolate_owner_class(struct richacl_alloc *alloc)
+{
+ struct richace *ace;
+ unsigned int allowed = 0;
+
+ allowed = richacl_max_allowed(alloc->acl);
+ if (allowed & ~alloc->acl->a_owner_mask) {
+ /*
+ * Figure out if we can update an existig OWNER@ DENY entry.
+ */
+ richacl_for_each_entry(ace, alloc->acl) {
+ if (richace_is_inherit_only(ace))
+ continue;
+ if (richace_is_deny(ace)) {
+ if (richace_is_owner(ace))
+ break;
+ } else if (richace_is_allow(ace)) {
+ ace = alloc->acl->a_entries + alloc->acl->a_count;
+ break;
+ }
+ }
+ if (ace != alloc->acl->a_entries + alloc->acl->a_count) {
+ if (richace_change_mask(alloc, &ace, ace->e_mask |
+ (allowed & ~alloc->acl->a_owner_mask)))
+ return -1;
+ } else {
+ /* Insert an owner@ deny entry at the front. */
+ ace = alloc->acl->a_entries;
+ if (richacl_insert_entry(alloc, &ace))
+ return -1;
+ ace->e_type = RICHACE_ACCESS_DENIED_ACE_TYPE;
+ ace->e_flags = RICHACE_SPECIAL_WHO;
+ ace->e_mask = allowed & ~alloc->acl->a_owner_mask;
+ ace->e_id.special = RICHACE_OWNER_SPECIAL_ID;
+ }
+ }
+ return 0;
+}
+
+/**
+ * __richacl_isolate_who - isolate entry from everyone@ allow entry
+ * @alloc: acl and number of allocated entries
+ * @who: identifier to isolate
+ * @deny: permissions this identifier should not be allowed
+ *
+ * See richacl_isolate_group_class().
+ */
+static int
+__richacl_isolate_who(struct richacl_alloc *alloc, struct richace *who,
+ unsigned int deny)
+{
+ struct richacl *acl = alloc->acl;
+ struct richace *ace;
+ int n;
+ /*
+ * Compute the permissions already denied to @who.
+ */
+ richacl_for_each_entry(ace, acl) {
+ if (richace_is_inherit_only(ace))
+ continue;
+ if (richace_is_same_identifier(ace, who) &&
+ richace_is_deny(ace))
+ deny &= ~ace->e_mask;
+ }
+ if (!deny)
+ return 0;
+
+ /*
+ * Figure out if we can update an existig deny entry. Start from the
+ * entry before the trailing everyone@ allow entry. We will not hit
+ * everyone@ entries in the loop.
+ */
+ for (n = acl->a_count - 2; n != -1; n--) {
+ ace = acl->a_entries + n;
+ if (richace_is_inherit_only(ace))
+ continue;
+ if (richace_is_deny(ace)) {
+ if (richace_is_same_identifier(ace, who))
+ break;
+ } else if (richace_is_allow(ace) &&
+ (ace->e_mask & deny)) {
+ n = -1;
+ break;
+ }
+ }
+ if (n != -1) {
+ if (richace_change_mask(alloc, &ace, ace->e_mask | deny))
+ return -1;
+ } else {
+ /*
+ * Insert a new entry before the trailing everyone@ deny entry.
+ */
+ struct richace who_copy;
+
+ richace_copy(&who_copy, who);
+ ace = acl->a_entries + acl->a_count - 1;
+ if (richacl_insert_entry(alloc, &ace))
+ return -1;
+ richace_copy(ace, &who_copy);
+ ace->e_type = RICHACE_ACCESS_DENIED_ACE_TYPE;
+ richace_clear_inheritance_flags(ace);
+ ace->e_mask = deny;
+ }
+ return 0;
+}
+
+/**
+ * richacl_isolate_group_class - limit the group class to the group file mask
+ * @alloc: acl and number of allocated entries
+ *
+ * POSIX requires that after a chmod, the group class is granted no more
+ * permissions than the group file permission bits. For richacls, this
+ * means that the group class must not be granted any permissions that the
+ * group mask does not include.
+ *
+ * When we apply file masks to an acl which grant more permissions to the other
+ * class than to the group class, we may end up in a situation where processes
+ * in the group class are granted additional permission from other aces. For
+ * example, given this acl:
+ *
+ * joe:rwx::allow
+ * everyone:rwx::allow
+ *
+ * when file masks corresponding to mode 0646 are applied, after
+ * richacl_propagate_everyone() and __richacl_apply_masks(), we end up with:
+ *
+ * joe:r::allow
+ * owner@:rw::allow
+ * group@:r::allow
+ * everyone@:rw::allow
+ *
+ * This acl still grants joe and group@ rw access through the everyone@ allow
+ * ace. To fix this, we must deny w access to group class aces before the
+ * everyone@ allow ace at the end of the acl:
+ *
+ * joe:r::allow
+ * owner@:rw::allow
+ * group@:r::allow
+ * joe:w::deny
+ * group@:w::deny
+ * everyone@:rw::allow
+ */
+static int
+richacl_isolate_group_class(struct richacl_alloc *alloc)
+{
+ struct richace who = {
+ .e_flags = RICHACE_SPECIAL_WHO,
+ .e_id.special = RICHACE_GROUP_SPECIAL_ID,
+ };
+ unsigned int deny;
+
+ deny = alloc->acl->a_other_mask & ~alloc->acl->a_group_mask;
+
+ if (deny) {
+ unsigned int n;
+
+ if (__richacl_isolate_who(alloc, &who, deny))
+ return -1;
+ /*
+ * Start from the entry before the trailing everyone@ allow
+ * entry. We will not hit everyone@ entries in the loop.
+ */
+ for (n = alloc->acl->a_count - 1; n != -1; n--) {
+ struct richace *ace = alloc->acl->a_entries + n;
+
+ if (richace_is_inherit_only(ace) ||
+ richace_is_owner(ace) ||
+ richace_is_group(ace) ||
+ richace_is_everyone(ace))
+ continue;
+ if (__richacl_isolate_who(alloc, ace, deny))
+ return -1;
+ }
+ }
+ return 0;
+}
--
2.4.3
^ permalink raw reply related
* [PATCH v5 24/39] richacl: Set the other permissions to the other mask
From: Andreas Gruenbacher @ 2015-07-22 13:03 UTC (permalink / raw)
To: linux-kernel
Cc: linux-fsdevel, linux-nfs, linux-api, samba-technical,
linux-security-module, Andreas Gruenbacher
In-Reply-To: <1437570209-29832-1-git-send-email-andreas.gruenbacher@gmail.com>
From: Andreas Gruenbacher <agruenba@redhat.com>
Change the acl so that everyone@ is granted the permissions set in the other
mask.
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
---
fs/richacl_compat.c | 33 +++++++++++++++++++++++++++++++++
1 file changed, 33 insertions(+)
diff --git a/fs/richacl_compat.c b/fs/richacl_compat.c
index db33b63..438859c 100644
--- a/fs/richacl_compat.c
+++ b/fs/richacl_compat.c
@@ -441,3 +441,36 @@ richacl_set_owner_permissions(struct richacl_alloc *alloc)
}
return 0;
}
+
+/**
+ * richacl_set_other_permissions - set the other permissions to the other mask
+ *
+ * Change the acl so that everyone@ is granted the permissions set in the other
+ * mask. This leaves at most one efective everyone@ allow entry at the end of
+ * the acl.
+ */
+static int
+richacl_set_other_permissions(struct richacl_alloc *alloc)
+{
+ struct richacl *acl = alloc->acl;
+ unsigned int x = RICHACE_POSIX_ALWAYS_ALLOWED;
+ unsigned int other_mask = acl->a_other_mask & ~x;
+ struct richace *ace = acl->a_entries + acl->a_count - 1;
+
+ if (!other_mask)
+ return 0;
+
+ if (acl->a_count == 0 ||
+ !richace_is_everyone(ace) ||
+ richace_is_inherit_only(ace)) {
+ ace++;
+ if (richacl_insert_entry(alloc, &ace))
+ return -1;
+ ace->e_type = RICHACE_ACCESS_ALLOWED_ACE_TYPE;
+ ace->e_flags = RICHACE_SPECIAL_WHO;
+ ace->e_mask = other_mask;
+ ace->e_id.special = RICHACE_EVERYONE_SPECIAL_ID;
+ } else
+ richace_change_mask(alloc, &ace, other_mask);
+ return 0;
+}
--
2.4.3
^ permalink raw reply related
* [PATCH v5 23/39] richacl: Set the owner permissions to the owner mask
From: Andreas Gruenbacher @ 2015-07-22 13:03 UTC (permalink / raw)
To: linux-kernel
Cc: linux-fsdevel, linux-nfs, linux-api, samba-technical,
linux-security-module, Andreas Gruenbacher
In-Reply-To: <1437570209-29832-1-git-send-email-andreas.gruenbacher@gmail.com>
From: Andreas Gruenbacher <agruenba@redhat.com>
Change the acl so that owner@ is granted the permissions set in the owner mask.
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
---
fs/richacl_compat.c | 42 ++++++++++++++++++++++++++++++++++++++++++
1 file changed, 42 insertions(+)
diff --git a/fs/richacl_compat.c b/fs/richacl_compat.c
index b709cde..db33b63 100644
--- a/fs/richacl_compat.c
+++ b/fs/richacl_compat.c
@@ -399,3 +399,45 @@ richacl_propagate_everyone(struct richacl_alloc *alloc)
}
return 0;
}
+
+/**
+ * richacl_set_owner_permissions - set the owner permissions to the owner mask
+ *
+ * Change the acl so that owner@ is granted the permissions set in the owner
+ * mask. This leaves at most one efective owner@ allow entry at the beginning
+ * of the acl.
+ */
+static int
+richacl_set_owner_permissions(struct richacl_alloc *alloc)
+{
+ unsigned int x = RICHACE_POSIX_ALWAYS_ALLOWED;
+ unsigned int owner_mask = alloc->acl->a_owner_mask & ~x;
+ unsigned int denied = 0;
+ struct richace *ace;
+
+ if (!owner_mask)
+ return 0;
+
+ richacl_for_each_entry(ace, alloc->acl) {
+ if (richace_is_owner(ace)) {
+ if (!richace_is_inherit_only(ace))
+ richace_change_mask(alloc, &ace, 0);
+ } else {
+ if (richace_is_deny(ace))
+ denied |= ace->e_mask;
+ }
+ }
+
+ if (owner_mask & (denied |
+ ~alloc->acl->a_other_mask |
+ ~alloc->acl->a_group_mask)) {
+ ace = alloc->acl->a_entries;
+ if (richacl_insert_entry(alloc, &ace))
+ return -1;
+ ace->e_type = RICHACE_ACCESS_ALLOWED_ACE_TYPE;
+ ace->e_flags = RICHACE_SPECIAL_WHO;
+ ace->e_mask = owner_mask;
+ ace->e_id.special = RICHACE_OWNER_SPECIAL_ID;
+ }
+ return 0;
+}
--
2.4.3
^ permalink raw reply related
* [PATCH v5 22/39] richacl: Propagate everyone@ permissions to other aces
From: Andreas Gruenbacher @ 2015-07-22 13:03 UTC (permalink / raw)
To: linux-kernel
Cc: linux-fsdevel, linux-nfs, linux-api, samba-technical,
linux-security-module, Andreas Gruenbacher, Andreas Gruenbacher
In-Reply-To: <1437570209-29832-1-git-send-email-andreas.gruenbacher@gmail.com>
From: Andreas Gruenbacher <agruenba@redhat.com>
The trailing everyone@ allow ace can grant permissions to all file
classes including the owner and group class. Before we can apply the
other mask to this entry to turn it into an "other class" entry, we need
to ensure that members of the owner or group class will not lose any
permissions from that ace.
Conceptually, we do this by inserting additional <who>:<allow>::allow
entries before the trailing everyone@ allow ace with the same
permissions as the trailing everyone@ allow ace for owner@, group@, and
all explicitly mentioned users and groups. (In practice, we will rarely
need to insert any additional aces in this step.)
Signed-off-by: Andreas Gruenbacher <agruen@kernel.org>
---
fs/richacl_compat.c | 182 ++++++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 182 insertions(+)
diff --git a/fs/richacl_compat.c b/fs/richacl_compat.c
index e10ead3..b709cde 100644
--- a/fs/richacl_compat.c
+++ b/fs/richacl_compat.c
@@ -217,3 +217,185 @@ richacl_move_everyone_aces_down(struct richacl_alloc *alloc)
}
return 0;
}
+
+/**
+ * __richacl_propagate_everyone - propagate everyone@ permissions up for @who
+ * @alloc: acl and number of allocated entries
+ * @who: identifier to propagate permissions for
+ * @allow: permissions to propagate up
+ *
+ * Propagate the permissions in @allow up from the end of the acl to the start
+ * for the specified principal @who.
+ *
+ * The simplest possible approach to achieve this would be to insert a
+ * "<who>:<allow>::allow" ace before the final everyone@ allow ace. Since this
+ * would often result in aces which are not needed or which could be merged
+ * with an existing ace, we make the following optimizations:
+ *
+ * - We go through the acl and determine which permissions are already
+ * allowed or denied to @who, and we remove those permissions from
+ * @allow.
+ *
+ * - If the acl contains an allow ace for @who and no aces after this entry
+ * deny permissions in @allow, we add the permissions in @allow to this
+ * ace. (Propagating permissions across a deny ace which can match the
+ * process can elevate permissions.)
+ *
+ * This transformation does not alter the permissions that the acl grants.
+ */
+static int
+__richacl_propagate_everyone(struct richacl_alloc *alloc, struct richace *who,
+ unsigned int allow)
+{
+ struct richace *allow_last = NULL, *ace;
+ struct richacl *acl = alloc->acl;
+
+ /*
+ * Remove the permissions from allow that are already determined for
+ * this who value, and figure out if there is an allow entry for
+ * this who value that is "reachable" from the trailing everyone@
+ * allow ace.
+ */
+ richacl_for_each_entry(ace, acl) {
+ if (richace_is_inherit_only(ace))
+ continue;
+ if (richace_is_allow(ace)) {
+ if (richace_is_same_identifier(ace, who)) {
+ allow &= ~ace->e_mask;
+ allow_last = ace;
+ }
+ } else if (richace_is_deny(ace)) {
+ if (richace_is_same_identifier(ace, who))
+ allow &= ~ace->e_mask;
+ else if (allow & ace->e_mask)
+ allow_last = NULL;
+ }
+ }
+ ace--;
+
+ /*
+ * If for group class entries, all the remaining permissions will
+ * remain granted by the trailing everyone@ ace, no additional entry is
+ * needed.
+ */
+ if (!richace_is_owner(who) &&
+ richace_is_everyone(ace) && richace_is_allow(ace) &&
+ !(allow & ~(ace->e_mask & acl->a_other_mask)))
+ allow = 0;
+
+ if (allow) {
+ if (allow_last)
+ return richace_change_mask(alloc, &allow_last,
+ allow_last->e_mask | allow);
+ else {
+ struct richace who_copy;
+
+ richace_copy(&who_copy, who);
+ ace = acl->a_entries + acl->a_count - 1;
+ if (richacl_insert_entry(alloc, &ace))
+ return -1;
+ richace_copy(ace, &who_copy);
+ ace->e_type = RICHACE_ACCESS_ALLOWED_ACE_TYPE;
+ richace_clear_inheritance_flags(ace);
+ ace->e_mask = allow;
+ }
+ }
+ return 0;
+}
+
+/**
+ * richacl_propagate_everyone - propagate everyone@ permissions up the acl
+ * @alloc: acl and number of allocated entries
+ *
+ * Make sure that group@ and all other users and groups mentioned in the acl
+ * will not lose any permissions when finally applying the other mask to the
+ * everyone@ allow ace at the end of the acl. We modify the permissions of
+ * existing entries or add new entries before the final everyone@ allow ace to
+ * achieve that.
+ *
+ * Entries for owner@ are ignored here; see richacl_set_owner_permissions().
+ *
+ * For example, the following acl implicitly grants everyone rwpx access:
+ *
+ * joe:r::allow
+ * everyone@:rwpx::allow
+ *
+ * When applying mode 0660 to this acl, group@ would lose rwp access, and joe
+ * would lose wp access even though the mode does not exclude those
+ * permissions. After propagating the everyone@ permissions, the result for
+ * applying mode 0660 becomes:
+ *
+ * owner@:rwp::allow
+ * joe:rwp::allow
+ * group@:rwp::allow
+ *
+ * Deny aces complicate the matter. For example, the following acl grants
+ * everyone but joe write access:
+ *
+ * joe:wp::deny
+ * everyone@:rwpx::allow
+ *
+ * When applying mode 0660 to this acl, group@ would lose rwp access, and joe
+ * would lose r access. After propagating the everyone@ permissions, the
+ * result for applying mode 0660 becomes:
+ *
+ * owner@:rwp::allow
+ * joe:w::deny
+ * group@:rwp::allow
+ * joe:r::allow
+ */
+static int
+richacl_propagate_everyone(struct richacl_alloc *alloc)
+{
+ struct richace who = { .e_flags = RICHACE_SPECIAL_WHO };
+ struct richacl *acl = alloc->acl;
+ struct richace *ace;
+ unsigned int group_allow;
+
+ /*
+ * If the group mask contains permissions which are not in the other
+ * mask, we may need to propagate permissions up from the everyone@
+ * allow ace.
+ */
+ if (!(acl->a_group_mask & ~acl->a_other_mask))
+ return 0;
+ if (!acl->a_count)
+ return 0;
+ ace = acl->a_entries + acl->a_count - 1;
+ if (richace_is_inherit_only(ace) || !richace_is_everyone(ace))
+ return 0;
+
+ group_allow = ace->e_mask & acl->a_group_mask;
+ if (group_allow & ~acl->a_other_mask) {
+ int n;
+
+ /* Propagate everyone@ permissions through to group@. */
+ who.e_id.special = RICHACE_GROUP_SPECIAL_ID;
+ if (__richacl_propagate_everyone(alloc, &who, group_allow))
+ return -1;
+ acl = alloc->acl;
+
+ /*
+ * Start from the entry before the trailing everyone@ allow
+ * entry. We will not hit everyone@ entries in the loop.
+ */
+ for (n = acl->a_count - 2; n != -1; n--) {
+ ace = acl->a_entries + n;
+
+ if (richace_is_inherit_only(ace) ||
+ richace_is_owner(ace) ||
+ richace_is_group(ace))
+ continue;
+ if (richace_is_allow(ace) || richace_is_deny(ace)) {
+ /*
+ * Any inserted entry will end up below the
+ * current entry
+ */
+ if (__richacl_propagate_everyone(alloc, ace,
+ group_allow))
+ return -1;
+ }
+ }
+ }
+ return 0;
+}
--
2.4.3
^ permalink raw reply related
* [PATCH v5 21/39] richacl: Move everyone@ aces down the acl
From: Andreas Gruenbacher @ 2015-07-22 13:03 UTC (permalink / raw)
To: linux-kernel
Cc: linux-fsdevel, linux-nfs, linux-api, samba-technical,
linux-security-module, Andreas Gruenbacher, Andreas Gruenbacher
In-Reply-To: <1437570209-29832-1-git-send-email-andreas.gruenbacher@gmail.com>
From: Andreas Gruenbacher <agruenba@redhat.com>
The POSIX standard puts processes which are not the owner or a member in
the owning group or which match any ace other then everyone@ on the
other file class. We only know if a process is in the other class after
processing the entire acl.
Move all everyone@ aces in the acl down in the acl so that at most a
single everyone@ allow ace remains at the end. Permissions which are
not explicitly allowed are implicitly denied, so an everyone@ deny ace is
unneeded.
The everyone@ aces can be moved down the acl without changing the
permissions that the acl grants. This transformation simplifies the
following algorithms, and eventually allows us to turn the final
everyone@ allow ace into an entry for the other class.
Signed-off-by: Andreas Gruenbacher <agruen@kernel.org>
---
fs/richacl_compat.c | 65 +++++++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 65 insertions(+)
diff --git a/fs/richacl_compat.c b/fs/richacl_compat.c
index 5bbf993..e10ead3 100644
--- a/fs/richacl_compat.c
+++ b/fs/richacl_compat.c
@@ -152,3 +152,68 @@ richace_change_mask(struct richacl_alloc *alloc, struct richace **ace,
}
return 0;
}
+
+/**
+ * richacl_move_everyone_aces_down - move everyone@ aces to the end of the acl
+ * @alloc: acl and number of allocated entries
+ *
+ * Move all everyone aces to the end of the acl so that only a single everyone@
+ * allow ace remains at the end, and update the mask fields of all aces on the
+ * way. The last ace of the resulting acl will be an everyone@ allow ace only
+ * if @acl grants any permissions to @everyone. No @everyone deny aces will
+ * remain.
+ *
+ * This transformation does not alter the permissions that the acl grants.
+ * Having at most one everyone@ allow ace at the end of the acl helps us in the
+ * following algorithms.
+ */
+static int
+richacl_move_everyone_aces_down(struct richacl_alloc *alloc)
+{
+ struct richace *ace;
+ unsigned int allowed = 0, denied = 0;
+
+ richacl_for_each_entry(ace, alloc->acl) {
+ if (richace_is_inherit_only(ace))
+ continue;
+ if (richace_is_everyone(ace)) {
+ if (richace_is_allow(ace))
+ allowed |= (ace->e_mask & ~denied);
+ else if (richace_is_deny(ace))
+ denied |= (ace->e_mask & ~allowed);
+ else
+ continue;
+ if (richace_change_mask(alloc, &ace, 0))
+ return -1;
+ } else {
+ if (richace_is_allow(ace)) {
+ if (richace_change_mask(alloc, &ace, allowed |
+ (ace->e_mask & ~denied)))
+ return -1;
+ } else if (richace_is_deny(ace)) {
+ if (richace_change_mask(alloc, &ace, denied |
+ (ace->e_mask & ~allowed)))
+ return -1;
+ }
+ }
+ }
+ if (allowed & ~RICHACE_POSIX_ALWAYS_ALLOWED) {
+ struct richace *last_ace = ace - 1;
+
+ if (alloc->acl->a_entries &&
+ richace_is_everyone(last_ace) &&
+ richace_is_allow(last_ace) &&
+ richace_is_inherit_only(last_ace) &&
+ last_ace->e_mask == allowed)
+ last_ace->e_flags &= ~RICHACE_INHERIT_ONLY_ACE;
+ else {
+ if (richacl_insert_entry(alloc, &ace))
+ return -1;
+ ace->e_type = RICHACE_ACCESS_ALLOWED_ACE_TYPE;
+ ace->e_flags = RICHACE_SPECIAL_WHO;
+ ace->e_mask = allowed;
+ ace->e_id.special = RICHACE_EVERYONE_SPECIAL_ID;
+ }
+ }
+ return 0;
+}
--
2.4.3
^ permalink raw reply related
* [PATCH v5 20/39] richacl: acl editing helper functions
From: Andreas Gruenbacher @ 2015-07-22 13:03 UTC (permalink / raw)
To: linux-kernel-u79uwXL29TY76Z2rM5mHXA
Cc: linux-fsdevel-u79uwXL29TY76Z2rM5mHXA,
linux-nfs-u79uwXL29TY76Z2rM5mHXA,
linux-api-u79uwXL29TY76Z2rM5mHXA,
samba-technical-w/Ol4Ecudpl8XjKLYN78aQ,
linux-security-module-u79uwXL29TY76Z2rM5mHXA, Andreas Gruenbacher,
Andreas Gruenbacher
In-Reply-To: <1437570209-29832-1-git-send-email-andreas.gruenbacher-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
From: Andreas Gruenbacher <agruenba-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
The file masks in richacls make chmod and creating new files more
efficient than having to apply file permission bits to the acl directly.
They also allow us to regain permissions from an acl even after a
restrictive chmod, because the permissions in the acl itself are not
being destroyed. In POSIX ACLs, the mask entry has a similar function.
Protocols like nfsv4 do not understand file masks. For those protocols,
we need to compute nfs4 acls which represent the effective permissions
granted by a richacl: we need to "apply" the file masks to the acl.
This is the first in a series of richacl transformation patches; it
implements basic richacl editing functions. The following patches
implement algorithms for transforming a richacl so that it can be
evaluated as a plain nfs4 acl, with identical permission check results.
Signed-off-by: Andreas Gruenbacher <agruen-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
---
fs/Makefile | 3 +-
fs/richacl_compat.c | 154 +++++++++++++++++++++++++++++++++++++++++
include/linux/richacl_compat.h | 40 +++++++++++
3 files changed, 196 insertions(+), 1 deletion(-)
create mode 100644 fs/richacl_compat.c
create mode 100644 include/linux/richacl_compat.h
diff --git a/fs/Makefile b/fs/Makefile
index baf385a..2d08c70 100644
--- a/fs/Makefile
+++ b/fs/Makefile
@@ -48,7 +48,8 @@ obj-$(CONFIG_SYSCTL) += drop_caches.o
obj-$(CONFIG_FHANDLE) += fhandle.o
obj-$(CONFIG_FS_RICHACL) += richacl.o
-richacl-y := richacl_base.o richacl_inode.o richacl_xattr.o
+richacl-y := richacl_base.o richacl_inode.o \
+ richacl_xattr.o richacl_compat.o
obj-y += quota/
diff --git a/fs/richacl_compat.c b/fs/richacl_compat.c
new file mode 100644
index 0000000..5bbf993
--- /dev/null
+++ b/fs/richacl_compat.c
@@ -0,0 +1,154 @@
+/*
+ * Copyright (C) 2006, 2010 Novell, Inc.
+ * Copyright (C) 2015 Red Hat, Inc.
+ * Written by Andreas Gruenbacher <agruen-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2, or (at your option) any
+ * later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ */
+
+#include <linux/module.h>
+#include <linux/fs.h>
+#include <linux/slab.h>
+#include <linux/richacl_compat.h>
+
+/**
+ * richacl_prepare - allocate richacl being constructed
+ *
+ * Allocate a richacl which can hold @count entries but which is initially
+ * empty.
+ */
+struct richacl *richacl_prepare(struct richacl_alloc *alloc, unsigned int count)
+{
+ alloc->acl = richacl_alloc(count, GFP_KERNEL);
+ if (!alloc->acl)
+ return NULL;
+ alloc->acl->a_count = 0;
+ alloc->count = count;
+ return alloc->acl;
+}
+EXPORT_SYMBOL_GPL(richacl_prepare);
+
+/**
+ * richacl_delete_entry - delete an entry in an acl
+ * @alloc: acl and number of allocated entries
+ * @ace: an entry in @alloc->acl
+ *
+ * Updates @ace so that it points to the entry before the deleted entry
+ * on return. (When deleting the first entry, @ace will point to the
+ * (non-existant) entry before the first entry). This behavior is the
+ * expected behavior when deleting entries while forward iterating over
+ * an acl.
+ */
+void
+richacl_delete_entry(struct richacl_alloc *alloc, struct richace **ace)
+{
+ void *end = alloc->acl->a_entries + alloc->acl->a_count;
+
+ memmove(*ace, *ace + 1, end - (void *)(*ace + 1));
+ (*ace)--;
+ alloc->acl->a_count--;
+}
+EXPORT_SYMBOL_GPL(richacl_delete_entry);
+
+/**
+ * richacl_insert_entry - insert an entry in an acl
+ * @alloc: acl and number of allocated entries
+ * @ace: entry before which the new entry shall be inserted
+ *
+ * Insert a new entry in @alloc->acl at position @ace and zero-initialize
+ * it. This may require reallocating @alloc->acl.
+ */
+int
+richacl_insert_entry(struct richacl_alloc *alloc, struct richace **ace)
+{
+ struct richacl *acl = alloc->acl;
+ unsigned int index = *ace - acl->a_entries;
+ size_t tail_size = (acl->a_count - index) * sizeof(struct richace);
+
+ if (alloc->count == acl->a_count) {
+ size_t new_size = sizeof(struct richacl) +
+ (acl->a_count + 1) * sizeof(struct richace);
+
+ acl = krealloc(acl, new_size, GFP_KERNEL);
+ if (!acl)
+ return -1;
+ *ace = acl->a_entries + index;
+ alloc->acl = acl;
+ alloc->count++;
+ }
+
+ memmove(*ace + 1, *ace, tail_size);
+ memset(*ace, 0, sizeof(**ace));
+ acl->a_count++;
+ return 0;
+}
+EXPORT_SYMBOL_GPL(richacl_insert_entry);
+
+/**
+ * richacl_append_entry - append an entry to an acl
+ * @alloc: acl and number of allocated entries
+ *
+ * This may require reallocating @alloc->acl.
+ */
+struct richace *richacl_append_entry(struct richacl_alloc *alloc)
+{
+ struct richacl *acl = alloc->acl;
+ struct richace *ace = acl->a_entries + acl->a_count;
+
+ if (alloc->count > alloc->acl->a_count) {
+ acl->a_count++;
+ return ace;
+ }
+ return richacl_insert_entry(alloc, &ace) ? NULL : ace;
+}
+EXPORT_SYMBOL_GPL(richacl_append_entry);
+
+/**
+ * richace_change_mask - set the mask of @ace to @mask
+ * @alloc: acl and number of allocated entries
+ * @ace: entry to modify
+ * @mask: new mask for @ace
+ *
+ * If @ace is inheritable, a inherit-only ace is inserted before @ace which
+ * includes the inheritable permissions of @ace and the inheritance flags of
+ * @ace are cleared before changing the mask.
+ *
+ * If @mask is 0, the original ace is turned into an inherit-only entry if
+ * there are any inheritable permissions, and removed otherwise.
+ *
+ * The returned @ace points to the modified or inserted effective-only acl
+ * entry if that entry exists, to the entry that has become inheritable-only,
+ * or else to the previous entry in the acl.
+ */
+static int
+richace_change_mask(struct richacl_alloc *alloc, struct richace **ace,
+ unsigned int mask)
+{
+ if (mask && (*ace)->e_mask == mask)
+ (*ace)->e_flags &= ~RICHACE_INHERIT_ONLY_ACE;
+ else if (mask & ~RICHACE_POSIX_ALWAYS_ALLOWED) {
+ if (richace_is_inheritable(*ace)) {
+ if (richacl_insert_entry(alloc, ace))
+ return -1;
+ richace_copy(*ace, *ace + 1);
+ (*ace)->e_flags |= RICHACE_INHERIT_ONLY_ACE;
+ (*ace)++;
+ richace_clear_inheritance_flags(*ace);
+ }
+ (*ace)->e_mask = mask;
+ } else {
+ if (richace_is_inheritable(*ace))
+ (*ace)->e_flags |= RICHACE_INHERIT_ONLY_ACE;
+ else
+ richacl_delete_entry(alloc, ace);
+ }
+ return 0;
+}
diff --git a/include/linux/richacl_compat.h b/include/linux/richacl_compat.h
new file mode 100644
index 0000000..a9ff630
--- /dev/null
+++ b/include/linux/richacl_compat.h
@@ -0,0 +1,40 @@
+/*
+ * Copyright (C) 2015 Red Hat, Inc.
+ * Written by Andreas Gruenbacher <agruenba-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2, or (at your option) any
+ * later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ */
+
+#ifndef __RICHACL_COMPAT_H
+#define __RICHACL_COMPAT_H
+
+#include <linux/richacl.h>
+
+/**
+ * struct richacl_alloc - remember how many entries are actually allocated
+ * @acl: acl with a_count <= @count
+ * @count: the actual number of entries allocated in @acl
+ *
+ * We pass around this structure while modifying an acl so that we do
+ * not have to reallocate when we remove existing entries followed by
+ * adding new entries.
+ */
+struct richacl_alloc {
+ struct richacl *acl;
+ unsigned int count;
+};
+
+struct richacl *richacl_prepare(struct richacl_alloc *, unsigned int);
+struct richace *richacl_append_entry(struct richacl_alloc *);
+int richacl_insert_entry(struct richacl_alloc *, struct richace **);
+void richacl_delete_entry(struct richacl_alloc *, struct richace **);
+
+#endif /* __RICHACL_COMPAT_H */
--
2.4.3
--
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^ permalink raw reply related
* [PATCH v5 19/39] ext4: Add richacl feature flag
From: Andreas Gruenbacher @ 2015-07-22 13:03 UTC (permalink / raw)
To: linux-kernel
Cc: linux-fsdevel, linux-nfs, linux-api, samba-technical,
linux-security-module, Aneesh Kumar K.V, Andreas Gruenbacher
In-Reply-To: <1437570209-29832-1-git-send-email-andreas.gruenbacher@gmail.com>
From: "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>
This feature flag selects richacl instead of posix acl support on the file
system. In addition, the "acl" mount option is needed for enabling either of
the two kinds of acls.
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
---
fs/ext4/ext4.h | 6 ++++--
fs/ext4/super.c | 41 ++++++++++++++++++++++++++++++++---------
2 files changed, 36 insertions(+), 11 deletions(-)
diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
index f5e9f04..e69c8ea 100644
--- a/fs/ext4/ext4.h
+++ b/fs/ext4/ext4.h
@@ -991,7 +991,7 @@ struct ext4_inode_info {
#define EXT4_MOUNT_UPDATE_JOURNAL 0x01000 /* Update the journal format */
#define EXT4_MOUNT_NO_UID32 0x02000 /* Disable 32-bit UIDs */
#define EXT4_MOUNT_XATTR_USER 0x04000 /* Extended user attributes */
-#define EXT4_MOUNT_POSIX_ACL 0x08000 /* POSIX Access Control Lists */
+#define EXT4_MOUNT_ACL 0x08000 /* Access Control Lists */
#define EXT4_MOUNT_NO_AUTO_DA_ALLOC 0x10000 /* No auto delalloc mapping */
#define EXT4_MOUNT_BARRIER 0x20000 /* Use block barriers */
#define EXT4_MOUNT_QUOTA 0x80000 /* Some quota option set */
@@ -1582,6 +1582,7 @@ static inline int ext4_encrypted_inode(struct inode *inode)
#define EXT4_FEATURE_INCOMPAT_LARGEDIR 0x4000 /* >2GB or 3-lvl htree */
#define EXT4_FEATURE_INCOMPAT_INLINE_DATA 0x8000 /* data in inode */
#define EXT4_FEATURE_INCOMPAT_ENCRYPT 0x10000
+#define EXT4_FEATURE_INCOMPAT_RICHACL 0x20000
#define EXT2_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR
#define EXT2_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \
@@ -1607,7 +1608,8 @@ static inline int ext4_encrypted_inode(struct inode *inode)
EXT4_FEATURE_INCOMPAT_FLEX_BG| \
EXT4_FEATURE_INCOMPAT_MMP | \
EXT4_FEATURE_INCOMPAT_INLINE_DATA | \
- EXT4_FEATURE_INCOMPAT_ENCRYPT)
+ EXT4_FEATURE_INCOMPAT_ENCRYPT | \
+ EXT4_FEATURE_INCOMPAT_RICHACL)
#define EXT4_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \
diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index 58987b5..0bffaa6 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -1257,6 +1257,27 @@ static ext4_fsblk_t get_sb_block(void **data)
return sb_block;
}
+static int enable_acl(struct super_block *sb)
+{
+ sb->s_flags &= ~(MS_POSIXACL | MS_RICHACL);
+ if (test_opt(sb, ACL)) {
+ if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RICHACL)) {
+#ifdef CONFIG_EXT4_FS_RICHACL
+ sb->s_flags |= MS_RICHACL;
+#else
+ return -EOPNOTSUPP;
+#endif
+ } else {
+#ifdef CONFIG_EXT4_FS_POSIX_ACL
+ sb->s_flags |= MS_POSIXACL;
+#else
+ return -EOPNOTSUPP;
+#endif
+ }
+ }
+ return 0;
+}
+
#define DEFAULT_JOURNAL_IOPRIO (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 3))
static char deprecated_msg[] = "Mount option \"%s\" will be removed by %s\n"
"Contact linux-ext4@vger.kernel.org if you think we should keep it.\n";
@@ -1403,9 +1424,9 @@ static const struct mount_opts {
MOPT_NO_EXT2 | MOPT_DATAJ},
{Opt_user_xattr, EXT4_MOUNT_XATTR_USER, MOPT_SET},
{Opt_nouser_xattr, EXT4_MOUNT_XATTR_USER, MOPT_CLEAR},
-#ifdef CONFIG_EXT4_FS_POSIX_ACL
- {Opt_acl, EXT4_MOUNT_POSIX_ACL, MOPT_SET},
- {Opt_noacl, EXT4_MOUNT_POSIX_ACL, MOPT_CLEAR},
+#if defined(CONFIG_EXT4_FS_POSIX_ACL) || defined(CONFIG_EXT4_FS_RICHACL)
+ {Opt_acl, EXT4_MOUNT_ACL, MOPT_SET},
+ {Opt_noacl, EXT4_MOUNT_ACL, MOPT_CLEAR},
#else
{Opt_acl, 0, MOPT_NOSUPPORT},
{Opt_noacl, 0, MOPT_NOSUPPORT},
@@ -3563,8 +3584,8 @@ static int ext4_fill_super(struct super_block *sb, void *data, int silent)
set_opt(sb, NO_UID32);
/* xattr user namespace & acls are now defaulted on */
set_opt(sb, XATTR_USER);
-#ifdef CONFIG_EXT4_FS_POSIX_ACL
- set_opt(sb, POSIX_ACL);
+#if defined(CONFIG_EXT4_FS_POSIX_ACL) || defined(CONFIG_EXT4_FS_RICHACL)
+ set_opt(sb, ACL);
#endif
/* don't forget to enable journal_csum when metadata_csum is enabled. */
if (ext4_has_metadata_csum(sb))
@@ -3645,8 +3666,9 @@ static int ext4_fill_super(struct super_block *sb, void *data, int silent)
clear_opt(sb, DELALLOC);
}
- sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
- (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
+ err = enable_acl(sb);
+ if (err)
+ goto failed_mount;
if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV &&
(EXT4_HAS_COMPAT_FEATURE(sb, ~0U) ||
@@ -4960,8 +4982,9 @@ static int ext4_remount(struct super_block *sb, int *flags, char *data)
if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED)
ext4_abort(sb, "Abort forced by user");
- sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
- (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
+ err = enable_acl(sb);
+ if (err)
+ goto restore_opts;
es = sbi->s_es;
--
2.4.3
^ permalink raw reply related
* [PATCH v5 18/39] ext4: Add richacl support
From: Andreas Gruenbacher @ 2015-07-22 13:03 UTC (permalink / raw)
To: linux-kernel
Cc: linux-fsdevel, linux-nfs, linux-api, samba-technical,
linux-security-module, Aneesh Kumar K.V, Andreas Gruenbacher
In-Reply-To: <1437570209-29832-1-git-send-email-andreas.gruenbacher@gmail.com>
From: "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>
Support the richacl permission model in ext4. The richacls are stored in
"system.richacl" xattrs. Richacls need to be enabled by tune2fs or at file
system create time.
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
---
fs/ext4/Kconfig | 15 ++++
fs/ext4/Makefile | 1 +
fs/ext4/acl.c | 6 +-
fs/ext4/acl.h | 12 ++--
fs/ext4/file.c | 6 +-
fs/ext4/ialloc.c | 7 +-
fs/ext4/inode.c | 10 ++-
fs/ext4/namei.c | 11 +--
fs/ext4/richacl.c | 211 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
fs/ext4/richacl.h | 47 ++++++++++++
fs/ext4/xattr.c | 6 ++
fs/ext4/xattr.h | 1 +
12 files changed, 314 insertions(+), 19 deletions(-)
create mode 100644 fs/ext4/richacl.c
create mode 100644 fs/ext4/richacl.h
diff --git a/fs/ext4/Kconfig b/fs/ext4/Kconfig
index bf8bc8a..77a386d 100644
--- a/fs/ext4/Kconfig
+++ b/fs/ext4/Kconfig
@@ -96,3 +96,18 @@ config EXT4_DEBUG
If you select Y here, then you will be able to turn on debugging
with a command such as:
echo 1 > /sys/module/ext4/parameters/mballoc_debug
+
+config EXT4_FS_RICHACL
+ bool "Ext4 Rich Access Control Lists (EXPERIMENTAL)"
+ depends on EXT4_FS
+ select FS_RICHACL
+ help
+ Rich ACLs are an implementation of NFSv4 ACLs, extended by file masks
+ to fit into the standard POSIX file permission model. They are
+ designed to work seamlessly locally as well as across the NFSv4 and
+ CIFS/SMB2 network file system protocols.
+
+ To learn more about Rich ACL, visit
+ http://acl.bestbits.at/richacl/
+
+ If you don't know what Rich ACLs are, say N
diff --git a/fs/ext4/Makefile b/fs/ext4/Makefile
index 75285ea..ea0d539 100644
--- a/fs/ext4/Makefile
+++ b/fs/ext4/Makefile
@@ -14,3 +14,4 @@ ext4-$(CONFIG_EXT4_FS_POSIX_ACL) += acl.o
ext4-$(CONFIG_EXT4_FS_SECURITY) += xattr_security.o
ext4-$(CONFIG_EXT4_FS_ENCRYPTION) += crypto_policy.o crypto.o \
crypto_key.o crypto_fname.o
+ext4-$(CONFIG_EXT4_FS_RICHACL) += richacl.o
diff --git a/fs/ext4/acl.c b/fs/ext4/acl.c
index 69b1e73..d965fa6 100644
--- a/fs/ext4/acl.c
+++ b/fs/ext4/acl.c
@@ -140,7 +140,7 @@ fail:
* inode->i_mutex: don't care
*/
struct posix_acl *
-ext4_get_acl(struct inode *inode, int type)
+ext4_get_posix_acl(struct inode *inode, int type)
{
int name_index;
char *value = NULL;
@@ -234,7 +234,7 @@ __ext4_set_acl(handle_t *handle, struct inode *inode, int type,
}
int
-ext4_set_acl(struct inode *inode, struct posix_acl *acl, int type)
+ext4_set_posix_acl(struct inode *inode, struct posix_acl *acl, int type)
{
handle_t *handle;
int error, retries = 0;
@@ -259,7 +259,7 @@ retry:
* inode->i_mutex: up (access to inode is still exclusive)
*/
int
-ext4_init_acl(handle_t *handle, struct inode *inode, struct inode *dir)
+ext4_init_posix_acl(handle_t *handle, struct inode *inode, struct inode *dir)
{
struct posix_acl *default_acl, *acl;
int error;
diff --git a/fs/ext4/acl.h b/fs/ext4/acl.h
index da2c795..450b4d1 100644
--- a/fs/ext4/acl.h
+++ b/fs/ext4/acl.h
@@ -54,17 +54,17 @@ static inline int ext4_acl_count(size_t size)
#ifdef CONFIG_EXT4_FS_POSIX_ACL
/* acl.c */
-struct posix_acl *ext4_get_acl(struct inode *inode, int type);
-int ext4_set_acl(struct inode *inode, struct posix_acl *acl, int type);
-extern int ext4_init_acl(handle_t *, struct inode *, struct inode *);
+struct posix_acl *ext4_get_posix_acl(struct inode *inode, int type);
+int ext4_set_posix_acl(struct inode *inode, struct posix_acl *acl, int type);
+extern int ext4_init_posix_acl(handle_t *, struct inode *, struct inode *);
#else /* CONFIG_EXT4_FS_POSIX_ACL */
#include <linux/sched.h>
-#define ext4_get_acl NULL
-#define ext4_set_acl NULL
+#define ext4_get_posix_acl NULL
+#define ext4_set_posix_acl NULL
static inline int
-ext4_init_acl(handle_t *handle, struct inode *inode, struct inode *dir)
+ext4_init_posix_acl(handle_t *handle, struct inode *inode, struct inode *dir)
{
return 0;
}
diff --git a/fs/ext4/file.c b/fs/ext4/file.c
index bc313ac..3d3fcc8 100644
--- a/fs/ext4/file.c
+++ b/fs/ext4/file.c
@@ -29,6 +29,7 @@
#include "ext4_jbd2.h"
#include "xattr.h"
#include "acl.h"
+#include "richacl.h"
/*
* Called when an inode is released. Note that this is different
@@ -659,8 +660,9 @@ const struct inode_operations ext4_file_inode_operations = {
.getxattr = generic_getxattr,
.listxattr = ext4_listxattr,
.removexattr = generic_removexattr,
- .get_acl = ext4_get_acl,
- .set_acl = ext4_set_acl,
+ .get_acl = ext4_get_posix_acl,
+ .set_acl = ext4_set_posix_acl,
+ .get_richacl = ext4_get_richacl,
.fiemap = ext4_fiemap,
};
diff --git a/fs/ext4/ialloc.c b/fs/ext4/ialloc.c
index 173c1ae..aa5d1e1 100644
--- a/fs/ext4/ialloc.c
+++ b/fs/ext4/ialloc.c
@@ -27,6 +27,7 @@
#include "ext4_jbd2.h"
#include "xattr.h"
#include "acl.h"
+#include "richacl.h"
#include <trace/events/ext4.h>
@@ -1050,7 +1051,11 @@ got:
if (err)
goto fail_drop;
- err = ext4_init_acl(handle, inode, dir);
+ if (EXT4_IS_RICHACL(dir))
+ err = ext4_init_richacl(handle, inode, dir);
+ else
+ err = ext4_init_posix_acl(handle, inode, dir);
+
if (err)
goto fail_free_drop;
diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index cecf9aa..7f6bbe8 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -41,6 +41,7 @@
#include "xattr.h"
#include "acl.h"
#include "truncate.h"
+#include "richacl.h"
#include <trace/events/ext4.h>
@@ -4782,9 +4783,12 @@ int ext4_setattr(struct dentry *dentry, struct iattr *attr)
if (orphan && inode->i_nlink)
ext4_orphan_del(NULL, inode);
- if (!rc && (ia_valid & ATTR_MODE))
- rc = posix_acl_chmod(inode, inode->i_mode);
-
+ if (!rc && (ia_valid & ATTR_MODE)) {
+ if (EXT4_IS_RICHACL(inode))
+ rc = ext4_richacl_chmod(inode);
+ else
+ rc = posix_acl_chmod(inode, inode->i_mode);
+ }
err_out:
ext4_std_error(inode->i_sb, error);
if (!error)
diff --git a/fs/ext4/namei.c b/fs/ext4/namei.c
index 011dcfb..9be6a8a 100644
--- a/fs/ext4/namei.c
+++ b/fs/ext4/namei.c
@@ -38,6 +38,7 @@
#include "xattr.h"
#include "acl.h"
+#include "richacl.h"
#include <trace/events/ext4.h>
/*
@@ -3821,8 +3822,9 @@ const struct inode_operations ext4_dir_inode_operations = {
.getxattr = generic_getxattr,
.listxattr = ext4_listxattr,
.removexattr = generic_removexattr,
- .get_acl = ext4_get_acl,
- .set_acl = ext4_set_acl,
+ .get_acl = ext4_get_posix_acl,
+ .set_acl = ext4_set_posix_acl,
+ .get_richacl = ext4_get_richacl,
.fiemap = ext4_fiemap,
};
@@ -3832,6 +3834,7 @@ const struct inode_operations ext4_special_inode_operations = {
.getxattr = generic_getxattr,
.listxattr = ext4_listxattr,
.removexattr = generic_removexattr,
- .get_acl = ext4_get_acl,
- .set_acl = ext4_set_acl,
+ .get_acl = ext4_get_posix_acl,
+ .set_acl = ext4_set_posix_acl,
+ .get_richacl = ext4_get_richacl,
};
diff --git a/fs/ext4/richacl.c b/fs/ext4/richacl.c
new file mode 100644
index 0000000..6ffb2ae
--- /dev/null
+++ b/fs/ext4/richacl.c
@@ -0,0 +1,211 @@
+/*
+ * Copyright IBM Corporation, 2010
+ * Copyright (C) 2015 Red Hat, Inc.
+ * Author Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of version 2.1 of the GNU Lesser General Public License
+ * as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it would be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+ *
+ */
+
+#include <linux/kernel.h>
+#include <linux/fs.h>
+#include <linux/richacl_xattr.h>
+
+#include "ext4.h"
+#include "ext4_jbd2.h"
+#include "xattr.h"
+#include "acl.h"
+#include "richacl.h"
+
+struct richacl *
+ext4_get_richacl(struct inode *inode)
+{
+ const int name_index = EXT4_XATTR_INDEX_RICHACL;
+ void *value = NULL;
+ struct richacl *acl;
+ int retval;
+
+ if (!IS_RICHACL(inode))
+ return ERR_PTR(-EOPNOTSUPP);
+ acl = get_cached_richacl(inode);
+ if (acl != ACL_NOT_CACHED)
+ return acl;
+ retval = ext4_xattr_get(inode, name_index, "", NULL, 0);
+ if (retval > 0) {
+ value = kmalloc(retval, GFP_NOFS);
+ if (!value)
+ return ERR_PTR(-ENOMEM);
+ retval = ext4_xattr_get(inode, name_index, "", value, retval);
+ }
+ if (retval > 0) {
+ acl = richacl_from_xattr(&init_user_ns, value, retval);
+ if (acl == ERR_PTR(-EINVAL))
+ acl = ERR_PTR(-EIO);
+ } else if (retval == -ENODATA || retval == -ENOSYS)
+ acl = NULL;
+ else
+ acl = ERR_PTR(retval);
+ kfree(value);
+
+ if (!IS_ERR(acl))
+ set_cached_richacl(inode, acl);
+
+ return acl;
+}
+
+static int
+ext4_set_richacl(handle_t *handle, struct inode *inode, struct richacl *acl)
+{
+ const int name_index = EXT4_XATTR_INDEX_RICHACL;
+ size_t size = 0;
+ void *value = NULL;
+ int retval;
+
+ if (acl) {
+ mode_t mode = inode->i_mode;
+ if (richacl_equiv_mode(acl, &mode) == 0) {
+ inode->i_mode = mode;
+ ext4_mark_inode_dirty(handle, inode);
+ acl = NULL;
+ }
+ }
+ if (acl) {
+ size = richacl_xattr_size(acl);
+ value = kmalloc(size, GFP_NOFS);
+ if (!value)
+ return -ENOMEM;
+ richacl_to_xattr(&init_user_ns, acl, value, size);
+ }
+ if (handle)
+ retval = ext4_xattr_set_handle(handle, inode, name_index, "",
+ value, size, 0);
+ else
+ retval = ext4_xattr_set(inode, name_index, "", value, size, 0);
+ kfree(value);
+ if (!retval)
+ set_cached_richacl(inode, acl);
+
+ return retval;
+}
+
+int
+ext4_init_richacl(handle_t *handle, struct inode *inode, struct inode *dir)
+{
+ struct richacl *acl = richacl_create(inode, dir);
+ int error;
+
+ error = PTR_ERR(acl);
+ if (IS_ERR(acl))
+ return error;
+ if (acl) {
+ error = ext4_set_richacl(handle, inode, acl);
+ richacl_put(acl);
+ }
+ return error;
+}
+
+int
+ext4_richacl_chmod(struct inode *inode)
+{
+ struct richacl *acl;
+ int retval;
+
+ if (S_ISLNK(inode->i_mode))
+ return -EOPNOTSUPP;
+ acl = ext4_get_richacl(inode);
+ if (IS_ERR_OR_NULL(acl))
+ return PTR_ERR(acl);
+ acl = richacl_chmod(acl, inode->i_mode);
+ if (IS_ERR(acl))
+ return PTR_ERR(acl);
+ retval = ext4_set_richacl(NULL, inode, acl);
+ richacl_put(acl);
+
+ return retval;
+}
+
+static size_t
+ext4_xattr_list_richacl(struct dentry *dentry, char *list, size_t list_len,
+ const char *name, size_t name_len, int type)
+{
+ const size_t size = sizeof(RICHACL_XATTR);
+ if (!IS_RICHACL(d_inode(dentry)))
+ return 0;
+ if (list && size <= list_len)
+ memcpy(list, RICHACL_XATTR, size);
+ return size;
+}
+
+static int
+ext4_xattr_get_richacl(struct dentry *dentry, const char *name, void *buffer,
+ size_t buffer_size, int type)
+{
+ struct richacl *acl;
+ int error;
+
+ if (strcmp(name, "") != 0)
+ return -EINVAL;
+ acl = ext4_get_richacl(d_inode(dentry));
+ if (IS_ERR(acl))
+ return PTR_ERR(acl);
+ if (acl == NULL)
+ return -ENODATA;
+
+ error = richacl_to_xattr(&init_user_ns, acl, buffer, buffer_size);
+ richacl_put(acl);
+ return error;
+}
+
+static int
+ext4_xattr_set_richacl(struct dentry *dentry, const char *name,
+ const void *value, size_t size, int flags, int type)
+{
+ handle_t *handle;
+ struct richacl *acl = NULL;
+ int retval, retries = 0;
+ struct inode *inode = d_inode(dentry);
+
+ if (!IS_RICHACL(d_inode(dentry)))
+ return -EOPNOTSUPP;
+ if (S_ISLNK(inode->i_mode))
+ return -EOPNOTSUPP;
+ if (strcmp(name, "") != 0)
+ return -EINVAL;
+ if (!uid_eq(current_fsuid(), inode->i_uid) &&
+ inode_permission(inode, MAY_CHMOD) &&
+ !capable(CAP_FOWNER))
+ return -EPERM;
+ if (value) {
+ acl = richacl_from_xattr(&init_user_ns, value, size);
+ if (IS_ERR(acl))
+ return PTR_ERR(acl);
+
+ inode->i_mode &= ~S_IRWXUGO;
+ inode->i_mode |= richacl_masks_to_mode(acl);
+ }
+
+retry:
+ handle = ext4_journal_start(inode, EXT4_HT_XATTR,
+ EXT4_DATA_TRANS_BLOCKS(inode->i_sb));
+ if (IS_ERR(handle))
+ return PTR_ERR(handle);
+ retval = ext4_set_richacl(handle, inode, acl);
+ ext4_journal_stop(handle);
+ if (retval == -ENOSPC && ext4_should_retry_alloc(inode->i_sb, &retries))
+ goto retry;
+ richacl_put(acl);
+ return retval;
+}
+
+const struct xattr_handler ext4_richacl_xattr_handler = {
+ .prefix = RICHACL_XATTR,
+ .list = ext4_xattr_list_richacl,
+ .get = ext4_xattr_get_richacl,
+ .set = ext4_xattr_set_richacl,
+};
diff --git a/fs/ext4/richacl.h b/fs/ext4/richacl.h
new file mode 100644
index 0000000..09a5cad
--- /dev/null
+++ b/fs/ext4/richacl.h
@@ -0,0 +1,47 @@
+/*
+ * Copyright IBM Corporation, 2010
+ * Copyright (C) 2015 Red Hat, Inc.
+ * Author Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of version 2.1 of the GNU Lesser General Public License
+ * as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it would be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+ *
+ */
+
+#ifndef __FS_EXT4_RICHACL_H
+#define __FS_EXT4_RICHACL_H
+
+#include <linux/richacl.h>
+
+#ifdef CONFIG_EXT4_FS_RICHACL
+
+#define EXT4_IS_RICHACL(inode) IS_RICHACL(inode)
+
+extern struct richacl *ext4_get_richacl(struct inode *);
+extern int ext4_init_richacl(handle_t *, struct inode *, struct inode *);
+extern int ext4_richacl_chmod(struct inode *);
+
+#else /* CONFIG_FS_EXT4_RICHACL */
+
+#define EXT4_IS_RICHACL(inode) (0)
+#define ext4_get_richacl NULL
+
+static inline int
+ext4_init_richacl(handle_t *handle, struct inode *inode, struct inode *dir)
+{
+ return 0;
+}
+
+static inline int
+ext4_richacl_chmod(struct inode *inode)
+{
+ return 0;
+}
+
+#endif /* CONFIG_FS_EXT4_RICHACL */
+#endif /* __FS_EXT4_RICHACL_H */
diff --git a/fs/ext4/xattr.c b/fs/ext4/xattr.c
index 16e28c0..c1dee9b 100644
--- a/fs/ext4/xattr.c
+++ b/fs/ext4/xattr.c
@@ -99,6 +99,9 @@ static const struct xattr_handler *ext4_xattr_handler_map[] = {
#ifdef CONFIG_EXT4_FS_SECURITY
[EXT4_XATTR_INDEX_SECURITY] = &ext4_xattr_security_handler,
#endif
+#ifdef CONFIG_EXT4_FS_RICHACL
+ [EXT4_XATTR_INDEX_RICHACL] = &ext4_richacl_xattr_handler,
+#endif
};
const struct xattr_handler *ext4_xattr_handlers[] = {
@@ -111,6 +114,9 @@ const struct xattr_handler *ext4_xattr_handlers[] = {
#ifdef CONFIG_EXT4_FS_SECURITY
&ext4_xattr_security_handler,
#endif
+#ifdef CONFIG_EXT4_FS_RICHACL
+ &ext4_richacl_xattr_handler,
+#endif
NULL
};
diff --git a/fs/ext4/xattr.h b/fs/ext4/xattr.h
index ddc0957..f315493 100644
--- a/fs/ext4/xattr.h
+++ b/fs/ext4/xattr.h
@@ -98,6 +98,7 @@ struct ext4_xattr_ibody_find {
extern const struct xattr_handler ext4_xattr_user_handler;
extern const struct xattr_handler ext4_xattr_trusted_handler;
extern const struct xattr_handler ext4_xattr_security_handler;
+extern const struct xattr_handler ext4_richacl_xattr_handler;
#define EXT4_XATTR_NAME_ENCRYPTION_CONTEXT "c"
--
2.4.3
^ permalink raw reply related
* [PATCH v5 17/39] vfs: Add richacl permission checking
From: Andreas Gruenbacher @ 2015-07-22 13:03 UTC (permalink / raw)
To: linux-kernel
Cc: linux-fsdevel, linux-nfs, linux-api, samba-technical,
linux-security-module, Andreas Gruenbacher
In-Reply-To: <1437570209-29832-1-git-send-email-andreas.gruenbacher@gmail.com>
From: Andreas Gruenbacher <agruenba@redhat.com>
Hook the richacl permission checking function into the vfs.
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
---
fs/namei.c | 51 +++++++++++++++++++++++++++++++++++++++++++++++++--
fs/posix_acl.c | 6 +++---
2 files changed, 52 insertions(+), 5 deletions(-)
diff --git a/fs/namei.c b/fs/namei.c
index 86be72c..fe73eaa 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -35,6 +35,7 @@
#include <linux/fs_struct.h>
#include <linux/posix_acl.h>
#include <linux/hash.h>
+#include <linux/richacl.h>
#include <asm/uaccess.h>
#include "internal.h"
@@ -255,7 +256,40 @@ void putname(struct filename *name)
__putname(name);
}
-static int check_acl(struct inode *inode, int mask)
+static int check_richacl(struct inode *inode, int mask)
+{
+#ifdef CONFIG_FS_RICHACL
+ struct richacl *acl;
+
+ if (mask & MAY_NOT_BLOCK) {
+ acl = get_cached_richacl_rcu(inode);
+ if (!acl)
+ goto no_acl;
+ /* no ->get_richacl() calls in RCU mode... */
+ if (acl == ACL_NOT_CACHED)
+ return -ECHILD;
+ return richacl_permission(inode, acl, mask & ~MAY_NOT_BLOCK);
+ }
+
+ acl = get_richacl(inode);
+ if (IS_ERR(acl))
+ return PTR_ERR(acl);
+ if (acl) {
+ int error = richacl_permission(inode, acl, mask);
+ richacl_put(acl);
+ return error;
+ }
+no_acl:
+#endif
+ if (mask & (MAY_DELETE_SELF | MAY_TAKE_OWNERSHIP |
+ MAY_CHMOD | MAY_SET_TIMES)) {
+ /* File permission bits cannot grant this. */
+ return -EACCES;
+ }
+ return -EAGAIN;
+}
+
+static int check_posix_acl(struct inode *inode, int mask)
{
#ifdef CONFIG_FS_POSIX_ACL
struct posix_acl *acl;
@@ -290,11 +324,24 @@ static int acl_permission_check(struct inode *inode, int mask)
{
unsigned int mode = inode->i_mode;
+ /*
+ * With POSIX ACLs, the (mode & S_IRWXU) bits exactly match the owner
+ * permissions, and we can skip checking posix acls for the owner.
+ * With richacls, the owner may be granted fewer permissions than the
+ * mode bits seem to suggest (for example, append but not write), and
+ * we always need to check the richacl.
+ */
+
+ if (IS_RICHACL(inode)) {
+ int error = check_richacl(inode, mask);
+ if (error != -EAGAIN)
+ return error;
+ }
if (likely(uid_eq(current_fsuid(), inode->i_uid)))
mode >>= 6;
else {
if (IS_POSIXACL(inode) && (mode & S_IRWXG)) {
- int error = check_acl(inode, mask);
+ int error = check_posix_acl(inode, mask);
if (error != -EAGAIN)
return error;
}
diff --git a/fs/posix_acl.c b/fs/posix_acl.c
index 1d766a5..3459bd5 100644
--- a/fs/posix_acl.c
+++ b/fs/posix_acl.c
@@ -100,13 +100,13 @@ struct posix_acl *get_acl(struct inode *inode, int type)
{
struct posix_acl *acl;
+ if (!IS_POSIXACL(inode))
+ return NULL;
+
acl = get_cached_acl(inode, type);
if (acl != ACL_NOT_CACHED)
return acl;
- if (!IS_POSIXACL(inode))
- return NULL;
-
/*
* A filesystem can force a ACL callback by just never filling the
* ACL cache. But normally you'd fill the cache either at inode
--
2.4.3
^ permalink raw reply related
* [PATCH v5 16/39] richacl: xattr mapping functions
From: Andreas Gruenbacher @ 2015-07-22 13:03 UTC (permalink / raw)
To: linux-kernel
Cc: linux-fsdevel, linux-nfs, linux-api, samba-technical,
linux-security-module, Andreas Gruenbacher
In-Reply-To: <1437570209-29832-1-git-send-email-andreas.gruenbacher@gmail.com>
From: Andreas Gruenbacher <agruenba@redhat.com>
Map between "system.richacl" xattrs and the in-kernel representation.
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
---
fs/Makefile | 2 +-
fs/richacl_xattr.c | 209 ++++++++++++++++++++++++++++++++++++++++++
fs/xattr.c | 34 +++++--
include/linux/richacl_xattr.h | 52 +++++++++++
include/uapi/linux/xattr.h | 2 +
5 files changed, 292 insertions(+), 7 deletions(-)
create mode 100644 fs/richacl_xattr.c
create mode 100644 include/linux/richacl_xattr.h
diff --git a/fs/Makefile b/fs/Makefile
index 1305047..baf385a 100644
--- a/fs/Makefile
+++ b/fs/Makefile
@@ -48,7 +48,7 @@ obj-$(CONFIG_SYSCTL) += drop_caches.o
obj-$(CONFIG_FHANDLE) += fhandle.o
obj-$(CONFIG_FS_RICHACL) += richacl.o
-richacl-y := richacl_base.o richacl_inode.o
+richacl-y := richacl_base.o richacl_inode.o richacl_xattr.o
obj-y += quota/
diff --git a/fs/richacl_xattr.c b/fs/richacl_xattr.c
new file mode 100644
index 0000000..d145915
--- /dev/null
+++ b/fs/richacl_xattr.c
@@ -0,0 +1,209 @@
+/*
+ * Copyright (C) 2006, 2010 Novell, Inc.
+ * Copyright (C) 2015 Red Hat, Inc.
+ * Written by Andreas Gruenbacher <agruen@kernel.org>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2, or (at your option) any
+ * later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ */
+
+#include <linux/sched.h>
+#include <linux/fs.h>
+#include <linux/slab.h>
+#include <linux/module.h>
+#include <linux/richacl_xattr.h>
+
+MODULE_LICENSE("GPL");
+
+/**
+ * richacl_from_xattr - convert a richacl xattr into the in-memory representation
+ */
+struct richacl *
+richacl_from_xattr(struct user_namespace *user_ns,
+ const void *value, size_t size)
+{
+ const struct richacl_xattr *xattr_acl = value;
+ const struct richace_xattr *xattr_ace = (void *)(xattr_acl + 1);
+ struct richacl *acl;
+ struct richace *ace;
+ int count;
+
+ if (size < sizeof(*xattr_acl) ||
+ xattr_acl->a_version != RICHACL_XATTR_VERSION ||
+ (xattr_acl->a_flags & ~RICHACL_VALID_FLAGS))
+ return ERR_PTR(-EINVAL);
+ size -= sizeof(*xattr_acl);
+ count = le16_to_cpu(xattr_acl->a_count);
+ if (count > RICHACL_XATTR_MAX_COUNT)
+ return ERR_PTR(-EINVAL);
+ if (size != count * sizeof(*xattr_ace))
+ return ERR_PTR(-EINVAL);
+
+ acl = richacl_alloc(count, GFP_NOFS);
+ if (!acl)
+ return ERR_PTR(-ENOMEM);
+
+ acl->a_flags = xattr_acl->a_flags;
+ acl->a_owner_mask = le32_to_cpu(xattr_acl->a_owner_mask);
+ if (acl->a_owner_mask & ~RICHACE_VALID_MASK)
+ goto fail_einval;
+ acl->a_group_mask = le32_to_cpu(xattr_acl->a_group_mask);
+ if (acl->a_group_mask & ~RICHACE_VALID_MASK)
+ goto fail_einval;
+ acl->a_other_mask = le32_to_cpu(xattr_acl->a_other_mask);
+ if (acl->a_other_mask & ~RICHACE_VALID_MASK)
+ goto fail_einval;
+
+ richacl_for_each_entry(ace, acl) {
+ ace->e_type = le16_to_cpu(xattr_ace->e_type);
+ ace->e_flags = le16_to_cpu(xattr_ace->e_flags);
+ ace->e_mask = le32_to_cpu(xattr_ace->e_mask);
+
+ if (ace->e_flags & ~RICHACE_VALID_FLAGS)
+ goto fail_einval;
+ if (ace->e_flags & RICHACE_SPECIAL_WHO) {
+ ace->e_id.special = le32_to_cpu(xattr_ace->e_id);
+ if (ace->e_id.special > RICHACE_EVERYONE_SPECIAL_ID)
+ goto fail_einval;
+ } else if (ace->e_flags & RICHACE_IDENTIFIER_GROUP) {
+ ace->e_id.gid = make_kgid(user_ns, le32_to_cpu(xattr_ace->e_id));
+ if (!gid_valid(ace->e_id.gid))
+ goto fail_einval;
+ } else {
+ ace->e_id.uid = make_kuid(user_ns, le32_to_cpu(xattr_ace->e_id));
+ if (!uid_valid(ace->e_id.uid))
+ goto fail_einval;
+ }
+ if (ace->e_type > RICHACE_ACCESS_DENIED_ACE_TYPE ||
+ (ace->e_mask & ~RICHACE_VALID_MASK))
+ goto fail_einval;
+
+ xattr_ace++;
+ }
+
+ return acl;
+
+fail_einval:
+ richacl_put(acl);
+ return ERR_PTR(-EINVAL);
+}
+EXPORT_SYMBOL_GPL(richacl_from_xattr);
+
+/**
+ * richacl_xattr_size - compute the size of the xattr representation of @acl
+ */
+size_t
+richacl_xattr_size(const struct richacl *acl)
+{
+ size_t size = sizeof(struct richacl_xattr);
+
+ size += sizeof(struct richace_xattr) * acl->a_count;
+ return size;
+}
+EXPORT_SYMBOL_GPL(richacl_xattr_size);
+
+/**
+ * richacl_to_xattr - convert @acl into its xattr representation
+ * @acl: the richacl to convert
+ * @buffer: buffer for the result
+ * @size: size of @buffer
+ */
+int
+richacl_to_xattr(struct user_namespace *user_ns,
+ const struct richacl *acl, void *buffer, size_t size)
+{
+ struct richacl_xattr *xattr_acl = buffer;
+ struct richace_xattr *xattr_ace;
+ const struct richace *ace;
+ size_t real_size;
+
+ real_size = richacl_xattr_size(acl);
+ if (!buffer)
+ return real_size;
+ if (real_size > size)
+ return -ERANGE;
+
+ xattr_acl->a_version = RICHACL_XATTR_VERSION;
+ xattr_acl->a_flags = acl->a_flags;
+ xattr_acl->a_count = cpu_to_le16(acl->a_count);
+
+ xattr_acl->a_owner_mask = cpu_to_le32(acl->a_owner_mask);
+ xattr_acl->a_group_mask = cpu_to_le32(acl->a_group_mask);
+ xattr_acl->a_other_mask = cpu_to_le32(acl->a_other_mask);
+
+ xattr_ace = (void *)(xattr_acl + 1);
+ richacl_for_each_entry(ace, acl) {
+ xattr_ace->e_type = cpu_to_le16(ace->e_type);
+ xattr_ace->e_flags = cpu_to_le16(ace->e_flags);
+ xattr_ace->e_mask = cpu_to_le32(ace->e_mask);
+ if (ace->e_flags & RICHACE_SPECIAL_WHO)
+ xattr_ace->e_id = cpu_to_le32(ace->e_id.special);
+ else if (ace->e_flags & RICHACE_IDENTIFIER_GROUP)
+ xattr_ace->e_id =
+ cpu_to_le32(from_kgid(user_ns, ace->e_id.gid));
+ else
+ xattr_ace->e_id =
+ cpu_to_le32(from_kuid(user_ns, ace->e_id.uid));
+ xattr_ace++;
+ }
+ return real_size;
+}
+EXPORT_SYMBOL_GPL(richacl_to_xattr);
+
+/*
+ * Fix up the uids and gids in richacl extended attributes in place.
+ */
+static void richacl_fix_xattr_userns(
+ struct user_namespace *to, struct user_namespace *from,
+ void *value, size_t size)
+{
+ struct richacl_xattr *xattr_acl = value;
+ struct richace_xattr *xattr_ace =
+ (struct richace_xattr *)(xattr_acl + 1);
+ unsigned int count;
+
+ if (!value)
+ return;
+ if (size < sizeof(*xattr_acl))
+ return;
+ if (xattr_acl->a_version != cpu_to_le32(RICHACL_XATTR_VERSION))
+ return;
+ size -= sizeof(*xattr_acl);
+ if (size % sizeof(*xattr_ace))
+ return;
+ count = size / sizeof(*xattr_ace);
+ for (; count; count--, xattr_ace++) {
+ if (xattr_ace->e_flags & cpu_to_le16(RICHACE_SPECIAL_WHO))
+ continue;
+ if (xattr_ace->e_flags & cpu_to_le16(RICHACE_IDENTIFIER_GROUP)) {
+ kgid_t gid = make_kgid(from, le32_to_cpu(xattr_ace->e_id));
+ xattr_ace->e_id = cpu_to_le32(from_kgid(to, gid));
+ } else {
+ kuid_t uid = make_kuid(from, le32_to_cpu(xattr_ace->e_id));
+ xattr_ace->e_id = cpu_to_le32(from_kuid(to, uid));
+ }
+ }
+}
+
+void richacl_fix_xattr_from_user(void *value, size_t size)
+{
+ struct user_namespace *user_ns = current_user_ns();
+ if (user_ns == &init_user_ns)
+ return;
+ richacl_fix_xattr_userns(&init_user_ns, user_ns, value, size);
+}
+
+void richacl_fix_xattr_to_user(void *value, size_t size)
+{
+ struct user_namespace *user_ns = current_user_ns();
+ if (user_ns == &init_user_ns)
+ return;
+ richacl_fix_xattr_userns(user_ns, &init_user_ns, value, size);
+}
diff --git a/fs/xattr.c b/fs/xattr.c
index 072fee1..f2313c6 100644
--- a/fs/xattr.c
+++ b/fs/xattr.c
@@ -21,6 +21,7 @@
#include <linux/audit.h>
#include <linux/vmalloc.h>
#include <linux/posix_acl_xattr.h>
+#include <linux/richacl_xattr.h>
#include <asm/uaccess.h>
@@ -314,6 +315,18 @@ out:
}
EXPORT_SYMBOL_GPL(vfs_removexattr);
+static void
+fix_xattr_from_user(const char *kname, void *kvalue, size_t size)
+{
+ if (strncmp(kname, XATTR_SYSTEM_PREFIX, XATTR_SYSTEM_PREFIX_LEN))
+ return;
+ kname += XATTR_SYSTEM_PREFIX_LEN;
+ if (!strcmp(kname, XATTR_POSIX_ACL_ACCESS) ||
+ !strcmp(kname, XATTR_POSIX_ACL_DEFAULT))
+ posix_acl_fix_xattr_from_user(kvalue, size);
+ else if (!strcmp(kname, XATTR_RICHACL))
+ richacl_fix_xattr_from_user(kvalue, size);
+}
/*
* Extended attribute SET operations
@@ -350,9 +363,7 @@ setxattr(struct dentry *d, const char __user *name, const void __user *value,
error = -EFAULT;
goto out;
}
- if ((strcmp(kname, XATTR_NAME_POSIX_ACL_ACCESS) == 0) ||
- (strcmp(kname, XATTR_NAME_POSIX_ACL_DEFAULT) == 0))
- posix_acl_fix_xattr_from_user(kvalue, size);
+ fix_xattr_from_user(kname, kvalue, size);
}
error = vfs_setxattr(d, kname, kvalue, size, flags);
@@ -419,6 +430,19 @@ SYSCALL_DEFINE5(fsetxattr, int, fd, const char __user *, name,
return error;
}
+static void
+fix_xattr_to_user(const char *kname, void *kvalue, size_t size)
+{
+ if (strncmp(kname, XATTR_SYSTEM_PREFIX, XATTR_SYSTEM_PREFIX_LEN))
+ return;
+ kname += XATTR_SYSTEM_PREFIX_LEN;
+ if (!strcmp(kname, XATTR_POSIX_ACL_ACCESS) ||
+ !strcmp(kname, XATTR_POSIX_ACL_DEFAULT))
+ posix_acl_fix_xattr_to_user(kvalue, size);
+ else if (!strcmp(kname, XATTR_RICHACL))
+ richacl_fix_xattr_to_user(kvalue, size);
+}
+
/*
* Extended attribute GET operations
*/
@@ -451,9 +475,7 @@ getxattr(struct dentry *d, const char __user *name, void __user *value,
error = vfs_getxattr(d, kname, kvalue, size);
if (error > 0) {
- if ((strcmp(kname, XATTR_NAME_POSIX_ACL_ACCESS) == 0) ||
- (strcmp(kname, XATTR_NAME_POSIX_ACL_DEFAULT) == 0))
- posix_acl_fix_xattr_to_user(kvalue, size);
+ fix_xattr_to_user(kname, kvalue, size);
if (size && copy_to_user(value, kvalue, error))
error = -EFAULT;
} else if (error == -ERANGE && size >= XATTR_SIZE_MAX) {
diff --git a/include/linux/richacl_xattr.h b/include/linux/richacl_xattr.h
new file mode 100644
index 0000000..1f75959
--- /dev/null
+++ b/include/linux/richacl_xattr.h
@@ -0,0 +1,52 @@
+/*
+ * Copyright (C) 2006, 2010 Novell, Inc.
+ * Copyright (C) 2015 Red Hat, Inc.
+ * Written by Andreas Gruenbacher <agruen@kernel.org>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2, or (at your option) any
+ * later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ */
+
+#ifndef __RICHACL_XATTR_H
+#define __RICHACL_XATTR_H
+
+#include <linux/richacl.h>
+
+#define RICHACL_XATTR "system.richacl"
+
+struct richace_xattr {
+ __le16 e_type;
+ __le16 e_flags;
+ __le32 e_mask;
+ __le32 e_id;
+};
+
+struct richacl_xattr {
+ unsigned char a_version;
+ unsigned char a_flags;
+ __le16 a_count;
+ __le32 a_owner_mask;
+ __le32 a_group_mask;
+ __le32 a_other_mask;
+};
+
+#define RICHACL_XATTR_VERSION 0
+#define RICHACL_XATTR_MAX_COUNT \
+ ((XATTR_SIZE_MAX - sizeof(struct richacl_xattr)) / \
+ sizeof(struct richace_xattr))
+
+extern struct richacl *richacl_from_xattr(struct user_namespace *, const void *, size_t);
+extern size_t richacl_xattr_size(const struct richacl *);
+extern int richacl_to_xattr(struct user_namespace *, const struct richacl *, void *, size_t);
+
+extern void richacl_fix_xattr_from_user(void *, size_t);
+extern void richacl_fix_xattr_to_user(void *, size_t);
+
+#endif /* __RICHACL_XATTR_H */
diff --git a/include/uapi/linux/xattr.h b/include/uapi/linux/xattr.h
index 1590c49..1996903 100644
--- a/include/uapi/linux/xattr.h
+++ b/include/uapi/linux/xattr.h
@@ -73,5 +73,7 @@
#define XATTR_POSIX_ACL_DEFAULT "posix_acl_default"
#define XATTR_NAME_POSIX_ACL_DEFAULT XATTR_SYSTEM_PREFIX XATTR_POSIX_ACL_DEFAULT
+#define XATTR_RICHACL "richacl"
+#define XATTR_NAME_RICHACL XATTR_SYSTEM_PREFIX XATTR_RICHACL
#endif /* _UAPI_LINUX_XATTR_H */
--
2.4.3
^ permalink raw reply related
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