diff options
| author | Christian Brauner <brauner@kernel.org> | 2023-01-13 12:49:32 +0100 |
|---|---|---|
| committer | Christian Brauner (Microsoft) <brauner@kernel.org> | 2023-01-19 09:24:30 +0100 |
| commit | 4d7ca4090184c153f8ccb1a68ca5cf136dac108b (patch) | |
| tree | 2beb8f9a791c2aeafd4dad7e052aa260b6926ab7 /fs/overlayfs | |
| parent | c14329d39f2daa8132e1bbe5cc531da387bcf44a (diff) | |
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/overlayfs')
| -rw-r--r-- | fs/overlayfs/inode.c | 10 |
1 files changed, 4 insertions, 6 deletions
diff --git a/fs/overlayfs/inode.c b/fs/overlayfs/inode.c index 4e56d0cb7cce..541cf3717fc2 100644 --- a/fs/overlayfs/inode.c +++ b/fs/overlayfs/inode.c @@ -463,7 +463,7 @@ ssize_t ovl_listxattr(struct dentry *dentry, char *list, size_t size) * alter the POSIX ACLs for the underlying filesystem. */ static void ovl_idmap_posix_acl(const struct inode *realinode, - struct user_namespace *mnt_userns, + struct mnt_idmap *idmap, struct posix_acl *acl) { struct user_namespace *fs_userns = i_user_ns(realinode); @@ -475,11 +475,11 @@ static void ovl_idmap_posix_acl(const struct inode *realinode, struct posix_acl_entry *e = &acl->a_entries[i]; switch (e->e_tag) { case ACL_USER: - vfsuid = make_vfsuid(mnt_userns, fs_userns, e->e_uid); + vfsuid = make_vfsuid(idmap, fs_userns, e->e_uid); e->e_uid = vfsuid_into_kuid(vfsuid); break; case ACL_GROUP: - vfsgid = make_vfsgid(mnt_userns, fs_userns, e->e_gid); + vfsgid = make_vfsgid(idmap, fs_userns, e->e_gid); e->e_gid = vfsgid_into_kgid(vfsgid); break; } @@ -514,12 +514,10 @@ struct posix_acl *ovl_get_acl_path(const struct path *path, const char *acl_name, bool noperm) { struct posix_acl *real_acl, *clone; - struct user_namespace *mnt_userns; struct mnt_idmap *idmap; struct inode *realinode = d_inode(path->dentry); idmap = mnt_idmap(path->mnt); - mnt_userns = mnt_idmap_owner(idmap); if (noperm) real_acl = get_inode_acl(realinode, posix_acl_type(acl_name)); @@ -542,7 +540,7 @@ struct posix_acl *ovl_get_acl_path(const struct path *path, if (!clone) return ERR_PTR(-ENOMEM); - ovl_idmap_posix_acl(realinode, mnt_userns, clone); + ovl_idmap_posix_acl(realinode, idmap, clone); return clone; } |