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

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[ Upstream commit 12f147ddd6de7382dad54812e65f3f08d05809fc ]

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 <[email protected]>
Fixes: 07b20889e3 ("beginning of the shared-subtree proper")
Reported-by: "Orlando, Noah" <[email protected]>
Signed-off-by: Al Viro <[email protected]>
Signed-off-by: Sasha Levin <[email protected]>
This commit is contained in:
Al Viro 2025-06-04 12:27:08 -04:00 • committed by Greg Kroah-Hartman
commit 787937c4e3
1 changed files with 4 additions and 0 deletions
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4
fs/namespace.c
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@ -2246,6 +2246,10 @@ static int do_change_type(struct path *path, int ms_flags)
return -EINVAL;
namespace_lock();
if (!check_mnt(mnt)) {
err = -EINVAL;
goto out_unlock;
}
if (type == MS_SHARED) {
err = invent_group_ids(mnt, recurse);
if (err)