linux-kernel - Re: [RFC PATCH 02/20] KEYS: Add a system blacklist keyring [ver #2]

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Message-ID: <25433.1454939711@warthog.procyon.org.uk>
Date:	Mon, 08 Feb 2016 13:55:11 +0000
From:	David Howells <dhowells@...hat.com>
To:	Mimi Zohar <zohar@...ux.vnet.ibm.com>
Cc:	dhowells@...hat.com, linux-security-module@...r.kernel.org,
	keyrings@...r.kernel.org, petkan@...-labs.com,
	linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH 02/20] KEYS: Add a system blacklist keyring [ver #2]

Mimi Zohar <zohar@...ux.vnet.ibm.com> wrote:

> In addition, this patch set removes the IMA blacklist without any method for
> adding blacklisted IMA keys to the system blacklist keyring.

That's not true.

Patch 18 enables userspace to add keys to the system blacklist keyring,
provided those keys are validly signed:

-			      KEY_USR_SEARCH,
+			      KEY_USR_SEARCH | KEY_USR_WRITE,
 			      KEY_ALLOC_NOT_IN_QUOTA |
 			      KEY_FLAG_KEEP,
-			      NULL, NULL);
+			      restrict_link_by_system_trusted, NULL);

After this commit, you can do everything with the system blacklist keyring
that you can currently do with the IMA blacklist keyring.

David