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mount: honour SB_NOUSER in the new mount API

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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>
This commit is contained in:
Al Viro
2026-06-02 03:04:44 +01:00
committed by Christian Brauner
parent 00633c4683
commit 6dd3c6884c
1 changed files with 4 additions and 0 deletions
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4
fs/namespace.c
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@@ -4498,6 +4498,10 @@ SYSCALL_DEFINE3(fsmount, int, fs_fd, unsigned int, flags,
new_mnt = vfs_create_mount(fc);
if (IS_ERR(new_mnt))
return PTR_ERR(new_mnt);
if (new_mnt->mnt_sb->s_flags & SB_NOUSER) {
mntput(new_mnt);
return -EINVAL;
}
new_mnt->mnt_flags = mnt_flags;
new_path.dentry = dget(fc->root);