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@xxxxxxxxxx>
---
security/keys/permission.c | 5 +++++
1 files changed, 5 insertions(+), 0 deletions(-)
diff --git a/security/keys/permission.c b/security/keys/permission.c
index 5d9fc7b..0ed802c 100644
--- a/security/keys/permission.c
+++ b/security/keys/permission.c
@@ -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;
--
1.5.4.3
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