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keys: consider user namespace in key_permission

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If a key is owned by another user namespace, then treat the
key as though it is owned by both another uid and gid.

Signed-off-by: Serge E. Hallyn <serue@us.ibm.com>
Acked-by: David Howells <dhowells@redhat.com>
Signed-off-by: James Morris <jmorris@namei.org>
This commit is contained in:
Serge E. Hallyn 2009-02-26 18:27:47 -06:00 committed by James Morris
parent 1d1e97562e
commit 8ff3bc3138
1 changed files with 5 additions and 0 deletions
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5
security/keys/permission.c
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@ -35,6 +35,9 @@ int key_task_permission(const key_ref_t key_ref, const struct cred *cred,
key = key_ref_to_ptr(key_ref);
if (key->user->user_ns != cred->user->user_ns)
goto use_other_perms;
/* use the second 8-bits of permissions for keys the caller owns */
if (key->uid == cred->fsuid) {
kperm = key->perm >> 16;
@ -56,6 +59,8 @@ int key_task_permission(const key_ref_t key_ref, const struct cred *cred,
}
}
use_other_perms:
/* otherwise use the least-significant 8-bits */
kperm = key->perm;