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do_change_type(): refuse to operate on unmounted/not ours mounts

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Ensure that propagation settings can only be changed for mounts located
in the caller's mount namespace. This change aligns permission checking
with the rest of mount(2).

Reviewed-by: Christian Brauner <brauner@kernel.org>
Fixes: 07b20889e3 ("beginning of the shared-subtree proper")
Reported-by: "Orlando, Noah" <Noah.Orlando@deshaw.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2025-06-04 12:27:08 -04:00
parent c28f922c9d
commit 12f147ddd6
1 changed files with 4 additions and 0 deletions
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4
fs/namespace.c
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@ -2959,6 +2959,10 @@ static int do_change_type(struct path *path, int ms_flags)
return -EINVAL; return -EINVAL;
namespace_lock(); namespace_lock();
if (!check_mnt(mnt)) {
err = -EINVAL;
goto out_unlock;
}
if (type == MS_SHARED) { if (type == MS_SHARED) {
err = invent_group_ids(mnt, recurse); err = invent_group_ids(mnt, recurse);
if (err) if (err)