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authorChristian Brauner <brauner@kernel.org>2023-01-13 14:49:32 +0300
committerChristian Brauner (Microsoft) <brauner@kernel.org>2023-01-19 11:24:30 +0300
commit4d7ca4090184c153f8ccb1a68ca5cf136dac108b (patch)
tree2beb8f9a791c2aeafd4dad7e052aa260b6926ab7 /fs/open.c
parentc14329d39f2daa8132e1bbe5cc531da387bcf44a (diff)
downloadlinux-4d7ca4090184c153f8ccb1a68ca5cf136dac108b.tar.xz
fs: port vfs{g,u}id helpers to mnt_idmap
Convert to struct mnt_idmap. Last cycle we merged the necessary infrastructure in 256c8aed2b42 ("fs: introduce dedicated idmap type for mounts"). This is just the conversion to struct mnt_idmap. Currently we still pass around the plain namespace that was attached to a mount. This is in general pretty convenient but it makes it easy to conflate namespaces that are relevant on the filesystem with namespaces that are relevent on the mount level. Especially for non-vfs developers without detailed knowledge in this area this can be a potential source for bugs. Once the conversion to struct mnt_idmap is done all helpers down to the really low-level helpers will take a struct mnt_idmap argument instead of two namespace arguments. This way it becomes impossible to conflate the two eliminating the possibility of any bugs. All of the vfs and all filesystems only operate on struct mnt_idmap. Acked-by: Dave Chinner <dchinner@redhat.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Christian Brauner (Microsoft) <brauner@kernel.org>
Diffstat (limited to 'fs/open.c')
-rw-r--r--fs/open.c7
1 files changed, 3 insertions, 4 deletions
diff --git a/fs/open.c b/fs/open.c
index e9e5da4815a9..f9d48da3c630 100644
--- a/fs/open.c
+++ b/fs/open.c
@@ -702,7 +702,7 @@ static inline bool setattr_vfsgid(struct iattr *attr, kgid_t kgid)
int chown_common(const struct path *path, uid_t user, gid_t group)
{
struct mnt_idmap *idmap;
- struct user_namespace *mnt_userns, *fs_userns;
+ struct user_namespace *fs_userns;
struct inode *inode = path->dentry->d_inode;
struct inode *delegated_inode = NULL;
int error;
@@ -714,7 +714,6 @@ int chown_common(const struct path *path, uid_t user, gid_t group)
gid = make_kgid(current_user_ns(), group);
idmap = mnt_idmap(path->mnt);
- mnt_userns = mnt_idmap_owner(idmap);
fs_userns = i_user_ns(inode);
retry_deleg:
@@ -732,8 +731,8 @@ retry_deleg:
/* Continue to send actual fs values, not the mount values. */
error = security_path_chown(
path,
- from_vfsuid(mnt_userns, fs_userns, newattrs.ia_vfsuid),
- from_vfsgid(mnt_userns, fs_userns, newattrs.ia_vfsgid));
+ from_vfsuid(idmap, fs_userns, newattrs.ia_vfsuid),
+ from_vfsgid(idmap, fs_userns, newattrs.ia_vfsgid));
if (!error)
error = notify_change(idmap, path->dentry, &newattrs,
&delegated_inode);