* [PATCH 5.10/6.1/6.12] mount: honour SB_NOUSER in the new mount API
@ 2026-08-07 10:38 Denis Arefev
2026-08-09 3:25 ` Sasha Levin
0 siblings, 1 reply; 2+ messages in thread
From: Denis Arefev @ 2026-08-07 10:38 UTC (permalink / raw)
To: stable, Greg Kroah-Hartman
Cc: Alexander Viro, Christian Brauner, Jan Kara, linux-fsdevel,
linux-kernel
From: Al Viro <viro@zeniv.linux.org.uk>
commit 6dd3c6884cd9defb511284b566cef5ac8f657dbf upstream.
One should *not* be allowed to mount one of those, new API or not.
Reported-by: Denis Arefev <arefev@swemel.ru>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Link: https://patch.msgid.link/20260602020444.GP2636677@ZenIV
Signed-off-by: Christian Brauner (Amutable) <brauner@kernel.org>
[Denis: rename new_mnt -> newmount.mnt]
[Denis: use goto err_unlock instead of direct return]
Signed-off-by: Denis Arefev <arefev@swemel.ru>
---
fs/namespace.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/fs/namespace.c b/fs/namespace.c
index 94c06c842902..a596381dba1c 100644
--- a/fs/namespace.c
+++ b/fs/namespace.c
@@ -4229,6 +4229,11 @@ SYSCALL_DEFINE3(fsmount, int, fs_fd, unsigned int, flags,
ret = PTR_ERR(newmount.mnt);
goto err_unlock;
}
+ if (newmount.mnt->mnt_sb->s_flags & SB_NOUSER) {
+ mntput(newmount.mnt);
+ ret = -EINVAL;
+ goto err_unlock;
+ }
newmount.dentry = dget(fc->root);
newmount.mnt->mnt_flags = mnt_flags;
--
2.43.0
^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [PATCH 5.10/6.1/6.12] mount: honour SB_NOUSER in the new mount API
2026-08-07 10:38 [PATCH 5.10/6.1/6.12] mount: honour SB_NOUSER in the new mount API Denis Arefev
@ 2026-08-09 3:25 ` Sasha Levin
0 siblings, 0 replies; 2+ messages in thread
From: Sasha Levin @ 2026-08-09 3:25 UTC (permalink / raw)
To: stable, Greg Kroah-Hartman
Cc: Sasha Levin, Alexander Viro, Christian Brauner, Jan Kara,
linux-fsdevel, linux-kernel, Denis Arefev
On Fri, Aug 07, 2026 at 01:38:27PM +0300, Denis Arefev wrote:
>From: Al Viro <viro@zeniv.linux.org.uk>
>
>commit 6dd3c6884cd9defb511284b566cef5ac8f657dbf upstream.
>
>One should *not* be allowed to mount one of those, new API or not.
Queued for 5.10, 5.15, 6.1, 6.6, 6.12 and 6.18, thanks.
--
Thanks,
Sasha
^ permalink raw reply [flat|nested] 2+ messages in thread
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