* [PATCH 6.6.y 1/4] nfsd: convert to new timestamp accessors
2026-01-03 19:38 [PATCH 6.6.y 0/4] NFSD: NFSv4 file creation neglects setting ACL Chuck Lever
@ 2026-01-03 19:38 ` Chuck Lever
2026-01-08 11:03 ` Greg Kroah-Hartman
2026-01-08 12:33 ` Greg Kroah-Hartman
2026-01-03 19:38 ` [PATCH 6.6.y 2/4] nfsd: Fix NFSv3 atomicity bugs in nfsd_setattr() Chuck Lever
` (2 subsequent siblings)
3 siblings, 2 replies; 9+ messages in thread
From: Chuck Lever @ 2026-01-03 19:38 UTC (permalink / raw)
To: stable; +Cc: linux-nfs, Greg Kroah-Hartman, Sasha Levin, Chuck Lever
From: Chuck Lever <chuck.lever@oracle.com>
[ Upstream commit 335a7be84b526861f3deb4fdd5d5c2a48cf1feef ]
[ cel: adjust to the 6.6.y version of fs/nfsd/blocklayout.c ]
Stable-dep-of: 24d92de9186e ("nfsd: Fix NFSv3 atomicity bugs in nfsd_setattr()")
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
---
fs/nfsd/nfs3proc.c | 4 ++--
fs/nfsd/nfs4proc.c | 8 ++++----
fs/nfsd/nfsctl.c | 2 +-
fs/nfsd/vfs.c | 2 +-
4 files changed, 8 insertions(+), 8 deletions(-)
diff --git a/fs/nfsd/nfs3proc.c b/fs/nfsd/nfs3proc.c
index 268ef57751c4..666bad8182e5 100644
--- a/fs/nfsd/nfs3proc.c
+++ b/fs/nfsd/nfs3proc.c
@@ -294,8 +294,8 @@ nfsd3_create_file(struct svc_rqst *rqstp, struct svc_fh *fhp,
status = nfserr_exist;
break;
case NFS3_CREATE_EXCLUSIVE:
- if (d_inode(child)->i_mtime.tv_sec == v_mtime &&
- d_inode(child)->i_atime.tv_sec == v_atime &&
+ if (inode_get_mtime_sec(d_inode(child)) == v_mtime &&
+ inode_get_atime_sec(d_inode(child)) == v_atime &&
d_inode(child)->i_size == 0) {
break;
}
diff --git a/fs/nfsd/nfs4proc.c b/fs/nfsd/nfs4proc.c
index 886c09267544..37b918e4a53d 100644
--- a/fs/nfsd/nfs4proc.c
+++ b/fs/nfsd/nfs4proc.c
@@ -322,8 +322,8 @@ nfsd4_create_file(struct svc_rqst *rqstp, struct svc_fh *fhp,
status = nfserr_exist;
break;
case NFS4_CREATE_EXCLUSIVE:
- if (d_inode(child)->i_mtime.tv_sec == v_mtime &&
- d_inode(child)->i_atime.tv_sec == v_atime &&
+ if (inode_get_mtime_sec(d_inode(child)) == v_mtime &&
+ inode_get_atime_sec(d_inode(child)) == v_atime &&
d_inode(child)->i_size == 0) {
open->op_created = true;
break; /* subtle */
@@ -331,8 +331,8 @@ nfsd4_create_file(struct svc_rqst *rqstp, struct svc_fh *fhp,
status = nfserr_exist;
break;
case NFS4_CREATE_EXCLUSIVE4_1:
- if (d_inode(child)->i_mtime.tv_sec == v_mtime &&
- d_inode(child)->i_atime.tv_sec == v_atime &&
+ if (inode_get_mtime_sec(d_inode(child)) == v_mtime &&
+ inode_get_atime_sec(d_inode(child)) == v_atime &&
d_inode(child)->i_size == 0) {
open->op_created = true;
goto set_attr; /* subtle */
diff --git a/fs/nfsd/nfsctl.c b/fs/nfsd/nfsctl.c
index 887035b74467..81e0b4726567 100644
--- a/fs/nfsd/nfsctl.c
+++ b/fs/nfsd/nfsctl.c
@@ -1140,7 +1140,7 @@ static struct inode *nfsd_get_inode(struct super_block *sb, umode_t mode)
/* Following advice from simple_fill_super documentation: */
inode->i_ino = iunique(sb, NFSD_MaxReserved);
inode->i_mode = mode;
- inode->i_atime = inode->i_mtime = inode_set_ctime_current(inode);
+ simple_inode_init_ts(inode);
switch (mode & S_IFMT) {
case S_IFDIR:
inode->i_fop = &simple_dir_operations;
diff --git a/fs/nfsd/vfs.c b/fs/nfsd/vfs.c
index 5ee7149ceaa5..1faf65147223 100644
--- a/fs/nfsd/vfs.c
+++ b/fs/nfsd/vfs.c
@@ -521,7 +521,7 @@ nfsd_setattr(struct svc_rqst *rqstp, struct svc_fh *fhp,
nfsd_sanitize_attrs(inode, iap);
- if (check_guard && guardtime != inode_get_ctime(inode).tv_sec)
+ if (check_guard && guardtime != inode_get_ctime_sec(inode))
return nfserr_notsync;
/*
--
2.52.0
^ permalink raw reply related [flat|nested] 9+ messages in thread* [PATCH 6.6.y 2/4] nfsd: Fix NFSv3 atomicity bugs in nfsd_setattr()
2026-01-03 19:38 [PATCH 6.6.y 0/4] NFSD: NFSv4 file creation neglects setting ACL Chuck Lever
2026-01-03 19:38 ` [PATCH 6.6.y 1/4] nfsd: convert to new timestamp accessors Chuck Lever
@ 2026-01-03 19:38 ` Chuck Lever
2026-01-03 19:38 ` [PATCH 6.6.y 3/4] nfsd: set security label during create operations Chuck Lever
2026-01-03 19:38 ` [PATCH 6.6.y 4/4] NFSD: NFSv4 file creation neglects setting ACL Chuck Lever
3 siblings, 0 replies; 9+ messages in thread
From: Chuck Lever @ 2026-01-03 19:38 UTC (permalink / raw)
To: stable
Cc: linux-nfs, Greg Kroah-Hartman, Sasha Levin, Chuck Lever,
Jeff Layton, NeilBrown
From: Chuck Lever <chuck.lever@oracle.com>
[ Upstream commit 24d92de9186ebc340687caf7356e1070773e67bc ]
nfsd: Fix NFSv3 atomicity bugs in nfsd_setattr()
The main point of the guarded SETATTR is to prevent races with other
WRITE and SETATTR calls. That requires that the check of the guard time
against the inode ctime be done after taking the inode lock.
Furthermore, we need to take into account the 32-bit nature of
timestamps in NFSv3, and the possibility that files may change at a
faster rate than once a second.
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Reviewed-by: NeilBrown <neilb@suse.de>
Stable-dep-of: 442d27ff09a2 ("nfsd: set security label during create operations")
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
---
fs/nfsd/nfs3proc.c | 6 ++++--
fs/nfsd/nfs3xdr.c | 5 +----
fs/nfsd/nfs4proc.c | 3 +--
fs/nfsd/nfs4state.c | 2 +-
fs/nfsd/nfsproc.c | 6 +++---
fs/nfsd/vfs.c | 20 +++++++++++++-------
fs/nfsd/vfs.h | 2 +-
fs/nfsd/xdr3.h | 2 +-
8 files changed, 25 insertions(+), 21 deletions(-)
diff --git a/fs/nfsd/nfs3proc.c b/fs/nfsd/nfs3proc.c
index 666bad8182e5..f4ccbb1f49ba 100644
--- a/fs/nfsd/nfs3proc.c
+++ b/fs/nfsd/nfs3proc.c
@@ -71,13 +71,15 @@ nfsd3_proc_setattr(struct svc_rqst *rqstp)
struct nfsd_attrs attrs = {
.na_iattr = &argp->attrs,
};
+ const struct timespec64 *guardtime = NULL;
dprintk("nfsd: SETATTR(3) %s\n",
SVCFH_fmt(&argp->fh));
fh_copy(&resp->fh, &argp->fh);
- resp->status = nfsd_setattr(rqstp, &resp->fh, &attrs,
- argp->check_guard, argp->guardtime);
+ if (argp->check_guard)
+ guardtime = &argp->guardtime;
+ resp->status = nfsd_setattr(rqstp, &resp->fh, &attrs, guardtime);
return rpc_success;
}
diff --git a/fs/nfsd/nfs3xdr.c b/fs/nfsd/nfs3xdr.c
index f32128955ec8..a7a07470c1f8 100644
--- a/fs/nfsd/nfs3xdr.c
+++ b/fs/nfsd/nfs3xdr.c
@@ -295,17 +295,14 @@ svcxdr_decode_sattr3(struct svc_rqst *rqstp, struct xdr_stream *xdr,
static bool
svcxdr_decode_sattrguard3(struct xdr_stream *xdr, struct nfsd3_sattrargs *args)
{
- __be32 *p;
u32 check;
if (xdr_stream_decode_bool(xdr, &check) < 0)
return false;
if (check) {
- p = xdr_inline_decode(xdr, XDR_UNIT * 2);
- if (!p)
+ if (!svcxdr_decode_nfstime3(xdr, &args->guardtime))
return false;
args->check_guard = 1;
- args->guardtime = be32_to_cpup(p);
} else
args->check_guard = 0;
diff --git a/fs/nfsd/nfs4proc.c b/fs/nfsd/nfs4proc.c
index 37b918e4a53d..c9ae789bb045 100644
--- a/fs/nfsd/nfs4proc.c
+++ b/fs/nfsd/nfs4proc.c
@@ -1160,8 +1160,7 @@ nfsd4_setattr(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
goto out;
save_no_wcc = cstate->current_fh.fh_no_wcc;
cstate->current_fh.fh_no_wcc = true;
- status = nfsd_setattr(rqstp, &cstate->current_fh, &attrs,
- 0, (time64_t)0);
+ status = nfsd_setattr(rqstp, &cstate->current_fh, &attrs, NULL);
cstate->current_fh.fh_no_wcc = save_no_wcc;
if (!status)
status = nfserrno(attrs.na_labelerr);
diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c
index 57f1f6aa19c9..511fedc37008 100644
--- a/fs/nfsd/nfs4state.c
+++ b/fs/nfsd/nfs4state.c
@@ -5223,7 +5223,7 @@ nfsd4_truncate(struct svc_rqst *rqstp, struct svc_fh *fh,
return 0;
if (!(open->op_share_access & NFS4_SHARE_ACCESS_WRITE))
return nfserr_inval;
- return nfsd_setattr(rqstp, fh, &attrs, 0, (time64_t)0);
+ return nfsd_setattr(rqstp, fh, &attrs, NULL);
}
static __be32 nfs4_get_vfs_file(struct svc_rqst *rqstp, struct nfs4_file *fp,
diff --git a/fs/nfsd/nfsproc.c b/fs/nfsd/nfsproc.c
index a7315928a760..36370b957b63 100644
--- a/fs/nfsd/nfsproc.c
+++ b/fs/nfsd/nfsproc.c
@@ -103,7 +103,7 @@ nfsd_proc_setattr(struct svc_rqst *rqstp)
}
}
- resp->status = nfsd_setattr(rqstp, fhp, &attrs, 0, (time64_t)0);
+ resp->status = nfsd_setattr(rqstp, fhp, &attrs, NULL);
if (resp->status != nfs_ok)
goto out;
@@ -390,8 +390,8 @@ nfsd_proc_create(struct svc_rqst *rqstp)
*/
attr->ia_valid &= ATTR_SIZE;
if (attr->ia_valid)
- resp->status = nfsd_setattr(rqstp, newfhp, &attrs, 0,
- (time64_t)0);
+ resp->status = nfsd_setattr(rqstp, newfhp, &attrs,
+ NULL);
}
out_unlock:
diff --git a/fs/nfsd/vfs.c b/fs/nfsd/vfs.c
index 1faf65147223..51c2ad3847c4 100644
--- a/fs/nfsd/vfs.c
+++ b/fs/nfsd/vfs.c
@@ -459,7 +459,6 @@ static int __nfsd_setattr(struct dentry *dentry, struct iattr *iap)
* @rqstp: controlling RPC transaction
* @fhp: filehandle of target
* @attr: attributes to set
- * @check_guard: set to 1 if guardtime is a valid timestamp
* @guardtime: do not act if ctime.tv_sec does not match this timestamp
*
* This call may adjust the contents of @attr (in particular, this
@@ -471,8 +470,7 @@ static int __nfsd_setattr(struct dentry *dentry, struct iattr *iap)
*/
__be32
nfsd_setattr(struct svc_rqst *rqstp, struct svc_fh *fhp,
- struct nfsd_attrs *attr,
- int check_guard, time64_t guardtime)
+ struct nfsd_attrs *attr, const struct timespec64 *guardtime)
{
struct dentry *dentry;
struct inode *inode;
@@ -521,9 +519,6 @@ nfsd_setattr(struct svc_rqst *rqstp, struct svc_fh *fhp,
nfsd_sanitize_attrs(inode, iap);
- if (check_guard && guardtime != inode_get_ctime_sec(inode))
- return nfserr_notsync;
-
/*
* The size case is special, it changes the file in addition to the
* attributes, and file systems don't expect it to be mixed with
@@ -541,6 +536,16 @@ nfsd_setattr(struct svc_rqst *rqstp, struct svc_fh *fhp,
err = fh_fill_pre_attrs(fhp);
if (err)
goto out_unlock;
+
+ if (guardtime) {
+ struct timespec64 ctime = inode_get_ctime(inode);
+ if ((u32)guardtime->tv_sec != (u32)ctime.tv_sec ||
+ guardtime->tv_nsec != ctime.tv_nsec) {
+ err = nfserr_notsync;
+ goto out_fill_attrs;
+ }
+ }
+
for (retries = 1;;) {
struct iattr attrs;
@@ -568,6 +573,7 @@ nfsd_setattr(struct svc_rqst *rqstp, struct svc_fh *fhp,
attr->na_aclerr = set_posix_acl(&nop_mnt_idmap,
dentry, ACL_TYPE_DEFAULT,
attr->na_dpacl);
+out_fill_attrs:
fh_fill_post_attrs(fhp);
out_unlock:
inode_unlock(inode);
@@ -1374,7 +1380,7 @@ nfsd_create_setattr(struct svc_rqst *rqstp, struct svc_fh *fhp,
* if the attributes have not changed.
*/
if (iap->ia_valid)
- status = nfsd_setattr(rqstp, resfhp, attrs, 0, (time64_t)0);
+ status = nfsd_setattr(rqstp, resfhp, attrs, NULL);
else
status = nfserrno(commit_metadata(resfhp));
diff --git a/fs/nfsd/vfs.h b/fs/nfsd/vfs.h
index e3c29596f4df..b476028e020b 100644
--- a/fs/nfsd/vfs.h
+++ b/fs/nfsd/vfs.h
@@ -69,7 +69,7 @@ __be32 nfsd_lookup_dentry(struct svc_rqst *, struct svc_fh *,
const char *, unsigned int,
struct svc_export **, struct dentry **);
__be32 nfsd_setattr(struct svc_rqst *, struct svc_fh *,
- struct nfsd_attrs *, int, time64_t);
+ struct nfsd_attrs *, const struct timespec64 *);
int nfsd_mountpoint(struct dentry *, struct svc_export *);
#ifdef CONFIG_NFSD_V4
__be32 nfsd4_vfs_fallocate(struct svc_rqst *, struct svc_fh *,
diff --git a/fs/nfsd/xdr3.h b/fs/nfsd/xdr3.h
index 03fe4e21306c..522067b7fd75 100644
--- a/fs/nfsd/xdr3.h
+++ b/fs/nfsd/xdr3.h
@@ -14,7 +14,7 @@ struct nfsd3_sattrargs {
struct svc_fh fh;
struct iattr attrs;
int check_guard;
- time64_t guardtime;
+ struct timespec64 guardtime;
};
struct nfsd3_diropargs {
--
2.52.0
^ permalink raw reply related [flat|nested] 9+ messages in thread* [PATCH 6.6.y 3/4] nfsd: set security label during create operations
2026-01-03 19:38 [PATCH 6.6.y 0/4] NFSD: NFSv4 file creation neglects setting ACL Chuck Lever
2026-01-03 19:38 ` [PATCH 6.6.y 1/4] nfsd: convert to new timestamp accessors Chuck Lever
2026-01-03 19:38 ` [PATCH 6.6.y 2/4] nfsd: Fix NFSv3 atomicity bugs in nfsd_setattr() Chuck Lever
@ 2026-01-03 19:38 ` Chuck Lever
2026-01-03 19:38 ` [PATCH 6.6.y 4/4] NFSD: NFSv4 file creation neglects setting ACL Chuck Lever
3 siblings, 0 replies; 9+ messages in thread
From: Chuck Lever @ 2026-01-03 19:38 UTC (permalink / raw)
To: stable
Cc: linux-nfs, Greg Kroah-Hartman, Sasha Levin, Chuck Lever,
Jeff Layton, NeilBrown
From: Chuck Lever <chuck.lever@oracle.com>
[ Upstream commit 442d27ff09a218b61020ab56387dbc508ad6bfa6 ]
When security labeling is enabled, the client can pass a file security
label as part of a create operation for the new file, similar to mode
and other attributes. At present, the security label is received by nfsd
and passed down to nfsd_create_setattr(), but nfsd_setattr() is never
called and therefore the label is never set on the new file. This bug
may have been introduced on or around commit d6a97d3f589a ("NFSD:
add security label to struct nfsd_attrs"). Looking at nfsd_setattr()
I am uncertain as to whether the same issue presents for
file ACLs and therefore requires a similar fix for those.
An alternative approach would be to introduce a new LSM hook to set the
"create SID" of the current task prior to the actual file creation, which
would atomically label the new inode at creation time. This would be better
for SELinux and a similar approach has been used previously
(see security_dentry_create_files_as) but perhaps not usable by other LSMs.
Reproducer:
1. Install a Linux distro with SELinux - Fedora is easiest
2. git clone https://github.com/SELinuxProject/selinux-testsuite
3. Install the requisite dependencies per selinux-testsuite/README.md
4. Run something like the following script:
MOUNT=$HOME/selinux-testsuite
sudo systemctl start nfs-server
sudo exportfs -o rw,no_root_squash,security_label localhost:$MOUNT
sudo mkdir -p /mnt/selinux-testsuite
sudo mount -t nfs -o vers=4.2 localhost:$MOUNT /mnt/selinux-testsuite
pushd /mnt/selinux-testsuite/
sudo make -C policy load
pushd tests/filesystem
sudo runcon -t test_filesystem_t ./create_file -f trans_test_file \
-e test_filesystem_filetranscon_t -v
sudo rm -f trans_test_file
popd
sudo make -C policy unload
popd
sudo umount /mnt/selinux-testsuite
sudo exportfs -u localhost:$MOUNT
sudo rmdir /mnt/selinux-testsuite
sudo systemctl stop nfs-server
Expected output:
<eliding noise from commands run prior to or after the test itself>
Process context:
unconfined_u:unconfined_r:test_filesystem_t:s0-s0:c0.c1023
Created file: trans_test_file
File context: unconfined_u:object_r:test_filesystem_filetranscon_t:s0
File context is correct
Actual output:
<eliding noise from commands run prior to or after the test itself>
Process context:
unconfined_u:unconfined_r:test_filesystem_t:s0-s0:c0.c1023
Created file: trans_test_file
File context: system_u:object_r:test_file_t:s0
File context error, expected:
test_filesystem_filetranscon_t
got:
test_file_t
Signed-off-by: Stephen Smalley <stephen.smalley.work@gmail.com>
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Reviewed-by: NeilBrown <neilb@suse.de>
Stable-dep-of: 913f7cf77bf1 ("NFSD: NFSv4 file creation neglects setting ACL")
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
---
fs/nfsd/vfs.c | 2 +-
fs/nfsd/vfs.h | 8 ++++++++
2 files changed, 9 insertions(+), 1 deletion(-)
diff --git a/fs/nfsd/vfs.c b/fs/nfsd/vfs.c
index 51c2ad3847c4..d2ca0739ae81 100644
--- a/fs/nfsd/vfs.c
+++ b/fs/nfsd/vfs.c
@@ -1379,7 +1379,7 @@ nfsd_create_setattr(struct svc_rqst *rqstp, struct svc_fh *fhp,
* Callers expect new file metadata to be committed even
* if the attributes have not changed.
*/
- if (iap->ia_valid)
+ if (nfsd_attrs_valid(attrs))
status = nfsd_setattr(rqstp, resfhp, attrs, NULL);
else
status = nfserrno(commit_metadata(resfhp));
diff --git a/fs/nfsd/vfs.h b/fs/nfsd/vfs.h
index b476028e020b..df9baaee052e 100644
--- a/fs/nfsd/vfs.h
+++ b/fs/nfsd/vfs.h
@@ -60,6 +60,14 @@ static inline void nfsd_attrs_free(struct nfsd_attrs *attrs)
posix_acl_release(attrs->na_dpacl);
}
+static inline bool nfsd_attrs_valid(struct nfsd_attrs *attrs)
+{
+ struct iattr *iap = attrs->na_iattr;
+
+ return (iap->ia_valid || (attrs->na_seclabel &&
+ attrs->na_seclabel->len));
+}
+
__be32 nfserrno (int errno);
int nfsd_cross_mnt(struct svc_rqst *rqstp, struct dentry **dpp,
struct svc_export **expp);
--
2.52.0
^ permalink raw reply related [flat|nested] 9+ messages in thread