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KEYS: Make request_key() and co. return an error for a negative key

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Make request_key() and co. return an error for a negative or rejected key.  If
the key was simply negated, then return ENOKEY, otherwise return the error
with which it was rejected.

Without this patch, the following command returns a key number (with the latest
keyutils):

	[root@andromeda ~]# keyctl request2 user debug:foo rejected @s
	586569904

Trying to print the key merely gets you a permission denied error:

	[root@andromeda ~]# keyctl print 586569904
	keyctl_read_alloc: Permission denied

Doing another request_key() call does get you the error, as long as it hasn't
expired yet:

	[root@andromeda ~]# keyctl request user debug:foo
	request_key: Key was rejected by service

Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: James Morris <jmorris@namei.org>
This commit is contained in:
David Howells 2011-03-11 17:57:33 +00:00 committed by James Morris
parent 78b7280cce
commit 4aab1e896a
1 changed files with 6 additions and 0 deletions
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6
security/keys/keyctl.c
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@ -206,8 +206,14 @@ SYSCALL_DEFINE4(request_key, const char __user *, _type,
goto error5; goto error5;
} }
/* wait for the key to finish being constructed */
ret = wait_for_key_construction(key, 1);
if (ret < 0)
goto error6;
ret = key->serial; ret = key->serial;
error6:
key_put(key); key_put(key);
error5: error5:
key_type_put(ktype); key_type_put(ktype);