imrcpan/erofs-linux
1
0 Fork 0
mirror of git://git.kernel.org/pub/scm/linux/kernel/git/xiang/erofs.git synced 2026-10-29 05:12:59 +01:00
Code Issues Packages Projects Releases Wiki Activity

fs: refuse fspick() on internal superblocks

Browse Source 
There's a few instances where a internal superblock is reachable by
fspick(). Block that. graft_tree() and fsmount() already refuse them.
fanotify refuses mount and superblock marks on them for the same reason.

Fixes: cf3cba4a42 ("vfs: syscall: Add fspick() to select a superblock for reconfiguration")
Cc: [email protected] # v5.2+
Link: https://patch.msgid.link/[email protected]
Signed-off-by: Christian Brauner (Amutable) <[email protected]>
This commit is contained in:
Christian Brauner committed 2026-09-26 15:47:41 +02:00
1 parent 08f4288a37
commit 02587a4af8
1 file changed
+3
Download Patch File Download Diff File Expand all files Collapse all files
fs/fsopen.c
+3
View File
@@ -190,6 +190,9 @@ SYSCALL_DEFINE3(fspick, int, dfd, const char __user *, path, unsigned int, flags
ret = -EINVAL;
if (target.mnt->mnt_root != target.dentry)
goto err_path;
/* kernel-internal superblocks are nobody's to reconfigure */
if (target.dentry->d_sb->s_flags & SB_NOUSER)
goto err_path;
fc = fs_context_for_reconfigure(target.dentry, 0, 0);
if (IS_ERR(fc)) {