* [PATCH 5.10 195/770] fs: add file and path permissions helpers
[not found] <20240618123407.280171066@linuxfoundation.org>
@ 2024-06-18 12:30 ` Greg Kroah-Hartman
2024-06-18 12:30 ` [PATCH 5.10 196/770] namei: introduce struct renamedata Greg Kroah-Hartman
1 sibling, 0 replies; 2+ messages in thread
From: Greg Kroah-Hartman @ 2024-06-18 12:30 UTC (permalink / raw)
To: stable
Cc: Greg Kroah-Hartman, patches, David Howells, Al Viro,
linux-fsdevel, Christoph Hellwig, James Morris, Christian Brauner,
Chuck Lever, Sasha Levin
5.10-stable review patch. If anyone has any objections, please let me know.
------------------
From: Christian Brauner <christian.brauner@ubuntu.com>
[ Upstream commit 02f92b3868a1b34ab98464e76b0e4e060474ba10 ]
Add two simple helpers to check permissions on a file and path
respectively and convert over some callers. It simplifies quite a few
codepaths and also reduces the churn in later patches quite a bit.
Christoph also correctly points out that this makes codepaths (e.g.
ioctls) way easier to follow that would otherwise have to do more
complex argument passing than necessary.
Link: https://lore.kernel.org/r/20210121131959.646623-4-christian.brauner@ubuntu.com
Cc: David Howells <dhowells@redhat.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: linux-fsdevel@vger.kernel.org
Suggested-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: James Morris <jamorris@linux.microsoft.com>
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
fs/init.c | 6 +++---
fs/notify/fanotify/fanotify_user.c | 2 +-
fs/notify/inotify/inotify_user.c | 2 +-
fs/open.c | 6 +++---
fs/udf/file.c | 2 +-
fs/verity/enable.c | 2 +-
include/linux/fs.h | 8 ++++++++
kernel/bpf/inode.c | 2 +-
kernel/sys.c | 2 +-
mm/madvise.c | 2 +-
mm/memcontrol.c | 2 +-
mm/mincore.c | 2 +-
net/unix/af_unix.c | 2 +-
13 files changed, 24 insertions(+), 16 deletions(-)
diff --git a/fs/init.c b/fs/init.c
index e9c320a48cf15..02723bea84990 100644
--- a/fs/init.c
+++ b/fs/init.c
@@ -49,7 +49,7 @@ int __init init_chdir(const char *filename)
error = kern_path(filename, LOOKUP_FOLLOW | LOOKUP_DIRECTORY, &path);
if (error)
return error;
- error = inode_permission(path.dentry->d_inode, MAY_EXEC | MAY_CHDIR);
+ error = path_permission(&path, MAY_EXEC | MAY_CHDIR);
if (!error)
set_fs_pwd(current->fs, &path);
path_put(&path);
@@ -64,7 +64,7 @@ int __init init_chroot(const char *filename)
error = kern_path(filename, LOOKUP_FOLLOW | LOOKUP_DIRECTORY, &path);
if (error)
return error;
- error = inode_permission(path.dentry->d_inode, MAY_EXEC | MAY_CHDIR);
+ error = path_permission(&path, MAY_EXEC | MAY_CHDIR);
if (error)
goto dput_and_out;
error = -EPERM;
@@ -118,7 +118,7 @@ int __init init_eaccess(const char *filename)
error = kern_path(filename, LOOKUP_FOLLOW, &path);
if (error)
return error;
- error = inode_permission(d_inode(path.dentry), MAY_ACCESS);
+ error = path_permission(&path, MAY_ACCESS);
path_put(&path);
return error;
}
diff --git a/fs/notify/fanotify/fanotify_user.c b/fs/notify/fanotify/fanotify_user.c
index 3e905b2e1b9c3..829ead2792dfb 100644
--- a/fs/notify/fanotify/fanotify_user.c
+++ b/fs/notify/fanotify/fanotify_user.c
@@ -702,7 +702,7 @@ static int fanotify_find_path(int dfd, const char __user *filename,
}
/* you can only watch an inode if you have read permissions on it */
- ret = inode_permission(path->dentry->d_inode, MAY_READ);
+ ret = path_permission(path, MAY_READ);
if (ret) {
path_put(path);
goto out;
diff --git a/fs/notify/inotify/inotify_user.c b/fs/notify/inotify/inotify_user.c
index ad8fb4bca6dc1..82fc0cf86a7c3 100644
--- a/fs/notify/inotify/inotify_user.c
+++ b/fs/notify/inotify/inotify_user.c
@@ -352,7 +352,7 @@ static int inotify_find_inode(const char __user *dirname, struct path *path,
if (error)
return error;
/* you can only watch an inode if you have read permissions on it */
- error = inode_permission(path->dentry->d_inode, MAY_READ);
+ error = path_permission(path, MAY_READ);
if (error) {
path_put(path);
return error;
diff --git a/fs/open.c b/fs/open.c
index 48933cbb75391..9f56ebacfbefe 100644
--- a/fs/open.c
+++ b/fs/open.c
@@ -492,7 +492,7 @@ SYSCALL_DEFINE1(chdir, const char __user *, filename)
if (error)
goto out;
- error = inode_permission(path.dentry->d_inode, MAY_EXEC | MAY_CHDIR);
+ error = path_permission(&path, MAY_EXEC | MAY_CHDIR);
if (error)
goto dput_and_out;
@@ -521,7 +521,7 @@ SYSCALL_DEFINE1(fchdir, unsigned int, fd)
if (!d_can_lookup(f.file->f_path.dentry))
goto out_putf;
- error = inode_permission(file_inode(f.file), MAY_EXEC | MAY_CHDIR);
+ error = file_permission(f.file, MAY_EXEC | MAY_CHDIR);
if (!error)
set_fs_pwd(current->fs, &f.file->f_path);
out_putf:
@@ -540,7 +540,7 @@ SYSCALL_DEFINE1(chroot, const char __user *, filename)
if (error)
goto out;
- error = inode_permission(path.dentry->d_inode, MAY_EXEC | MAY_CHDIR);
+ error = path_permission(&path, MAY_EXEC | MAY_CHDIR);
if (error)
goto dput_and_out;
diff --git a/fs/udf/file.c b/fs/udf/file.c
index e283a62701b83..25f7c915f22b7 100644
--- a/fs/udf/file.c
+++ b/fs/udf/file.c
@@ -181,7 +181,7 @@ long udf_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
long old_block, new_block;
int result;
- if (inode_permission(inode, MAY_READ) != 0) {
+ if (file_permission(filp, MAY_READ) != 0) {
udf_debug("no permission to access inode %lu\n", inode->i_ino);
return -EPERM;
}
diff --git a/fs/verity/enable.c b/fs/verity/enable.c
index 5ceae66e1ae02..29becb66d0d88 100644
--- a/fs/verity/enable.c
+++ b/fs/verity/enable.c
@@ -369,7 +369,7 @@ int fsverity_ioctl_enable(struct file *filp, const void __user *uarg)
* has verity enabled, and to stabilize the data being hashed.
*/
- err = inode_permission(inode, MAY_WRITE);
+ err = file_permission(filp, MAY_WRITE);
if (err)
return err;
diff --git a/include/linux/fs.h b/include/linux/fs.h
index 6de70634e5471..0974e8160f50c 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -2824,6 +2824,14 @@ static inline int bmap(struct inode *inode, sector_t *block)
extern int notify_change(struct dentry *, struct iattr *, struct inode **);
extern int inode_permission(struct inode *, int);
extern int generic_permission(struct inode *, int);
+static inline int file_permission(struct file *file, int mask)
+{
+ return inode_permission(file_inode(file), mask);
+}
+static inline int path_permission(const struct path *path, int mask)
+{
+ return inode_permission(d_inode(path->dentry), mask);
+}
extern int __check_sticky(struct inode *dir, struct inode *inode);
static inline bool execute_ok(struct inode *inode)
diff --git a/kernel/bpf/inode.c b/kernel/bpf/inode.c
index 6b14b4c4068cc..5966013bc788b 100644
--- a/kernel/bpf/inode.c
+++ b/kernel/bpf/inode.c
@@ -507,7 +507,7 @@ static void *bpf_obj_do_get(const char __user *pathname,
return ERR_PTR(ret);
inode = d_backing_inode(path.dentry);
- ret = inode_permission(inode, ACC_MODE(flags));
+ ret = path_permission(&path, ACC_MODE(flags));
if (ret)
goto out;
diff --git a/kernel/sys.c b/kernel/sys.c
index efc213ae4c5ad..7a2cfb57fa9e7 100644
--- a/kernel/sys.c
+++ b/kernel/sys.c
@@ -1873,7 +1873,7 @@ static int prctl_set_mm_exe_file(struct mm_struct *mm, unsigned int fd)
if (!S_ISREG(inode->i_mode) || path_noexec(&exe.file->f_path))
goto exit;
- err = inode_permission(inode, MAY_EXEC);
+ err = file_permission(exe.file, MAY_EXEC);
if (err)
goto exit;
diff --git a/mm/madvise.c b/mm/madvise.c
index f71fc88f0b331..a63aa04ec7fa3 100644
--- a/mm/madvise.c
+++ b/mm/madvise.c
@@ -543,7 +543,7 @@ static inline bool can_do_pageout(struct vm_area_struct *vma)
* opens a side channel.
*/
return inode_owner_or_capable(file_inode(vma->vm_file)) ||
- inode_permission(file_inode(vma->vm_file), MAY_WRITE) == 0;
+ file_permission(vma->vm_file, MAY_WRITE) == 0;
}
static long madvise_pageout(struct vm_area_struct *vma,
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index ddc8ed096deca..186ae9dba0fd5 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -4918,7 +4918,7 @@ static ssize_t memcg_write_event_control(struct kernfs_open_file *of,
/* the process need read permission on control file */
/* AV: shouldn't we check that it's been opened for read instead? */
- ret = inode_permission(file_inode(cfile.file), MAY_READ);
+ ret = file_permission(cfile.file, MAY_READ);
if (ret < 0)
goto out_put_cfile;
diff --git a/mm/mincore.c b/mm/mincore.c
index 02db1a834021b..7bdb4673f776a 100644
--- a/mm/mincore.c
+++ b/mm/mincore.c
@@ -167,7 +167,7 @@ static inline bool can_do_mincore(struct vm_area_struct *vma)
* mappings, which opens a side channel.
*/
return inode_owner_or_capable(file_inode(vma->vm_file)) ||
- inode_permission(file_inode(vma->vm_file), MAY_WRITE) == 0;
+ file_permission(vma->vm_file, MAY_WRITE) == 0;
}
static const struct mm_walk_ops mincore_walk_ops = {
diff --git a/net/unix/af_unix.c b/net/unix/af_unix.c
index 3ab726a668e8a..405bf3e6eb796 100644
--- a/net/unix/af_unix.c
+++ b/net/unix/af_unix.c
@@ -959,7 +959,7 @@ static struct sock *unix_find_other(struct net *net,
if (err)
goto fail;
inode = d_backing_inode(path.dentry);
- err = inode_permission(inode, MAY_WRITE);
+ err = path_permission(&path, MAY_WRITE);
if (err)
goto put_fail;
--
2.43.0
^ permalink raw reply related [flat|nested] 2+ messages in thread* [PATCH 5.10 196/770] namei: introduce struct renamedata
[not found] <20240618123407.280171066@linuxfoundation.org>
2024-06-18 12:30 ` [PATCH 5.10 195/770] fs: add file and path permissions helpers Greg Kroah-Hartman
@ 2024-06-18 12:30 ` Greg Kroah-Hartman
1 sibling, 0 replies; 2+ messages in thread
From: Greg Kroah-Hartman @ 2024-06-18 12:30 UTC (permalink / raw)
To: stable
Cc: Greg Kroah-Hartman, patches, Christoph Hellwig, David Howells,
Al Viro, linux-fsdevel, Christian Brauner, Sasha Levin
5.10-stable review patch. If anyone has any objections, please let me know.
------------------
From: Christian Brauner <christian.brauner@ubuntu.com>
[ Upstream commit 9fe61450972d3900bffb1dc26a17ebb9cdd92db2 ]
In order to handle idmapped mounts we will extend the vfs rename helper
to take two new arguments in follow up patches. Since this operations
already takes a bunch of arguments add a simple struct renamedata and
make the current helper use it before we extend it.
Link: https://lore.kernel.org/r/20210121131959.646623-14-christian.brauner@ubuntu.com
Cc: Christoph Hellwig <hch@lst.de>
Cc: David Howells <dhowells@redhat.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: linux-fsdevel@vger.kernel.org
Reviewed-by: Christoph Hellwig <hch@lst.de>
[ cel: backported to 5.10.y, prior to idmapped mounts ]
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
fs/cachefiles/namei.c | 9 +++++++--
fs/ecryptfs/inode.c | 10 +++++++---
fs/namei.c | 21 +++++++++++++++------
fs/nfsd/vfs.c | 8 +++++++-
fs/overlayfs/overlayfs.h | 9 ++++++++-
include/linux/fs.h | 12 +++++++++++-
6 files changed, 55 insertions(+), 14 deletions(-)
diff --git a/fs/cachefiles/namei.c b/fs/cachefiles/namei.c
index ecc8ecbbfa5ac..7b987de0babe8 100644
--- a/fs/cachefiles/namei.c
+++ b/fs/cachefiles/namei.c
@@ -412,9 +412,14 @@ static int cachefiles_bury_object(struct cachefiles_cache *cache,
if (ret < 0) {
cachefiles_io_error(cache, "Rename security error %d", ret);
} else {
+ struct renamedata rd = {
+ .old_dir = d_inode(dir),
+ .old_dentry = rep,
+ .new_dir = d_inode(cache->graveyard),
+ .new_dentry = grave,
+ };
trace_cachefiles_rename(object, rep, grave, why);
- ret = vfs_rename(d_inode(dir), rep,
- d_inode(cache->graveyard), grave, NULL, 0);
+ ret = vfs_rename(&rd);
if (ret != 0 && ret != -ENOMEM)
cachefiles_io_error(cache,
"Rename failed with error %d", ret);
diff --git a/fs/ecryptfs/inode.c b/fs/ecryptfs/inode.c
index c867a0d62f360..1dbe0c3ff38ea 100644
--- a/fs/ecryptfs/inode.c
+++ b/fs/ecryptfs/inode.c
@@ -598,6 +598,7 @@ ecryptfs_rename(struct inode *old_dir, struct dentry *old_dentry,
struct dentry *lower_new_dir_dentry;
struct dentry *trap;
struct inode *target_inode;
+ struct renamedata rd = {};
if (flags)
return -EINVAL;
@@ -627,9 +628,12 @@ ecryptfs_rename(struct inode *old_dir, struct dentry *old_dentry,
rc = -ENOTEMPTY;
goto out_lock;
}
- rc = vfs_rename(d_inode(lower_old_dir_dentry), lower_old_dentry,
- d_inode(lower_new_dir_dentry), lower_new_dentry,
- NULL, 0);
+
+ rd.old_dir = d_inode(lower_old_dir_dentry);
+ rd.old_dentry = lower_old_dentry;
+ rd.new_dir = d_inode(lower_new_dir_dentry);
+ rd.new_dentry = lower_new_dentry;
+ rc = vfs_rename(&rd);
if (rc)
goto out_lock;
if (target_inode)
diff --git a/fs/namei.c b/fs/namei.c
index cb37d7c477e0b..72521a614514b 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -4277,11 +4277,14 @@ SYSCALL_DEFINE2(link, const char __user *, oldname, const char __user *, newname
* ->i_mutex on parents, which works but leads to some truly excessive
* locking].
*/
-int vfs_rename(struct inode *old_dir, struct dentry *old_dentry,
- struct inode *new_dir, struct dentry *new_dentry,
- struct inode **delegated_inode, unsigned int flags)
+int vfs_rename(struct renamedata *rd)
{
int error;
+ struct inode *old_dir = rd->old_dir, *new_dir = rd->new_dir;
+ struct dentry *old_dentry = rd->old_dentry;
+ struct dentry *new_dentry = rd->new_dentry;
+ struct inode **delegated_inode = rd->delegated_inode;
+ unsigned int flags = rd->flags;
bool is_dir = d_is_dir(old_dentry);
struct inode *source = old_dentry->d_inode;
struct inode *target = new_dentry->d_inode;
@@ -4429,6 +4432,7 @@ EXPORT_SYMBOL(vfs_rename);
int do_renameat2(int olddfd, struct filename *from, int newdfd,
struct filename *to, unsigned int flags)
{
+ struct renamedata rd;
struct dentry *old_dentry, *new_dentry;
struct dentry *trap;
struct path old_path, new_path;
@@ -4532,9 +4536,14 @@ int do_renameat2(int olddfd, struct filename *from, int newdfd,
&new_path, new_dentry, flags);
if (error)
goto exit5;
- error = vfs_rename(old_path.dentry->d_inode, old_dentry,
- new_path.dentry->d_inode, new_dentry,
- &delegated_inode, flags);
+
+ rd.old_dir = old_path.dentry->d_inode;
+ rd.old_dentry = old_dentry;
+ rd.new_dir = new_path.dentry->d_inode;
+ rd.new_dentry = new_dentry;
+ rd.delegated_inode = &delegated_inode;
+ rd.flags = flags;
+ error = vfs_rename(&rd);
exit5:
dput(new_dentry);
exit4:
diff --git a/fs/nfsd/vfs.c b/fs/nfsd/vfs.c
index 3e30788e0046b..d12c3e71ca10e 100644
--- a/fs/nfsd/vfs.c
+++ b/fs/nfsd/vfs.c
@@ -1812,7 +1812,13 @@ nfsd_rename(struct svc_rqst *rqstp, struct svc_fh *ffhp, char *fname, int flen,
close_cached = true;
goto out_dput_old;
} else {
- host_err = vfs_rename(fdir, odentry, tdir, ndentry, NULL, 0);
+ struct renamedata rd = {
+ .old_dir = fdir,
+ .old_dentry = odentry,
+ .new_dir = tdir,
+ .new_dentry = ndentry,
+ };
+ host_err = vfs_rename(&rd);
if (!host_err) {
host_err = commit_metadata(tfhp);
if (!host_err)
diff --git a/fs/overlayfs/overlayfs.h b/fs/overlayfs/overlayfs.h
index 26f91868fbdaf..87b7a4a74f4ed 100644
--- a/fs/overlayfs/overlayfs.h
+++ b/fs/overlayfs/overlayfs.h
@@ -212,9 +212,16 @@ static inline int ovl_do_rename(struct inode *olddir, struct dentry *olddentry,
unsigned int flags)
{
int err;
+ struct renamedata rd = {
+ .old_dir = olddir,
+ .old_dentry = olddentry,
+ .new_dir = newdir,
+ .new_dentry = newdentry,
+ .flags = flags,
+ };
pr_debug("rename(%pd2, %pd2, 0x%x)\n", olddentry, newdentry, flags);
- err = vfs_rename(olddir, olddentry, newdir, newdentry, NULL, flags);
+ err = vfs_rename(&rd);
if (err) {
pr_debug("...rename(%pd2, %pd2, ...) = %i\n",
olddentry, newdentry, err);
diff --git a/include/linux/fs.h b/include/linux/fs.h
index 0974e8160f50c..cc3b6ddf58223 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -1780,7 +1780,17 @@ extern int vfs_symlink(struct inode *, struct dentry *, const char *);
extern int vfs_link(struct dentry *, struct inode *, struct dentry *, struct inode **);
extern int vfs_rmdir(struct inode *, struct dentry *);
extern int vfs_unlink(struct inode *, struct dentry *, struct inode **);
-extern int vfs_rename(struct inode *, struct dentry *, struct inode *, struct dentry *, struct inode **, unsigned int);
+
+struct renamedata {
+ struct inode *old_dir;
+ struct dentry *old_dentry;
+ struct inode *new_dir;
+ struct dentry *new_dentry;
+ struct inode **delegated_inode;
+ unsigned int flags;
+} __randomize_layout;
+
+int vfs_rename(struct renamedata *);
static inline int vfs_whiteout(struct inode *dir, struct dentry *dentry)
{
--
2.43.0
^ permalink raw reply related [flat|nested] 2+ messages in thread