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openat2: don't trigger automounts with RESOLVE_NO_XDEV

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commit 042a60680d upstream.

openat2 had a bug: if we pass RESOLVE_NO_XDEV, then openat2
doesn't traverse through automounts, but may still trigger them.
(See the link for full bug report with reproducer.)

This commit fixes this bug.

Link: https://lore.kernel.org/linux-fsdevel/20250817075252.4137628-1-safinaskar@zohomail.com/
Fixes: fddb5d430a ("open: introduce openat2(2) syscall")
Reviewed-by: Aleksa Sarai <cyphar@cyphar.com>
Cc: stable@vger.kernel.org
Signed-off-by: Askar Safin <safinaskar@zohomail.com>
Link: https://lore.kernel.org/20250825181233.2464822-5-safinaskar@zohomail.com
Signed-off-by: Christian Brauner <brauner@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Askar Safin
2025-08-25 18:12:33 +00:00
committed by Greg Kroah-Hartman
parent 65074c41d7
commit 066c9afe6b
1 changed files with 8 additions and 0 deletions
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8
fs/namei.c
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@@ -1449,6 +1449,10 @@ static int follow_automount(struct path *path, int *count, unsigned lookup_flags
dentry->d_inode)
return -EISDIR;
/* No need to trigger automounts if mountpoint crossing is disabled. */
if (lookup_flags & LOOKUP_NO_XDEV)
return -EXDEV;
if (count && (*count)++ >= MAXSYMLINKS)
return -ELOOP;
@@ -1472,6 +1476,10 @@ static int __traverse_mounts(struct path *path, unsigned flags, bool *jumped,
/* Allow the filesystem to manage the transit without i_rwsem
* being held. */
if (flags & DCACHE_MANAGE_TRANSIT) {
if (lookup_flags & LOOKUP_NO_XDEV) {
ret = -EXDEV;
break;
}
ret = path->dentry->d_op->d_manage(path, false);
flags = smp_load_acquire(&path->dentry->d_flags);
if (ret < 0)