| Message ID | 155024708261.21651.15380024848711404052.stgit@warthog.procyon.org.uk |
|---|---|
| State | New |
| Headers | show |
| Series | Containers and using authenticated filesystems | expand |
diff --git a/security/keys/request_key.c b/security/keys/request_key.c index ab1f6de9e623..10244b6fbf5d 100644 --- a/security/keys/request_key.c +++ b/security/keys/request_key.c @@ -564,6 +564,16 @@ struct key *request_key_and_link(struct key_type *type, key_ref = search_process_keyrings(&ctx); if (!IS_ERR(key_ref)) { + if (dest_keyring) { + ret = key_task_permission(key_ref, current_cred(), + KEY_NEED_LINK); + if (ret < 0) { + key_ref_put(key_ref); + key = ERR_PTR(ret); + goto error_free; + } + } + key = key_ref_to_ptr(key_ref); if (dest_keyring) { ret = key_link(dest_keyring, key);
The request_key() syscall allows a process to gain access to the 'possessor' permits of any key that grants it Search permission by virtue of request_key() not checking whether a key it finds grants Link permission to the caller. Signed-off-by: David Howells <dhowells@redhat.com> --- security/keys/request_key.c | 10 ++++++++++ 1 file changed, 10 insertions(+)