linux-kernel - [PATCH 24/25] MODSIGN: Allow modules to be signed with an unknown key unless enforcing

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Message-ID: <20120816013834.872.7280.stgit@warthog.procyon.org.uk>
Date:	Thu, 16 Aug 2012 02:38:34 +0100
From:	David Howells <dhowells@...hat.com>
To:	rusty@...tcorp.com.au
Cc:	dhowells@...hat.com, dmitry.kasatkin@...el.com,
	zohar@...ux.vnet.ibm.com, jmorris@...ei.org,
	keyrings@...ux-nfs.org, linux-security-module@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH 24/25] MODSIGN: Allow modules to be signed with an unknown key
 unless enforcing

Currently we fail the loading of modules that are signed with a public key
that is not in the modsign keyring even if we are not in enforcing mode.
This is somewhat at odds with the fact that we allow a completely unsigned
module to load in such a case.

We should allow modules signed with an unknown key to load in cases
where we are not enforcing and not in FIPS mode.

Signed-off-by: Josh Boyer <jwboyer@...hat.com>
Signed-off-by: David Howells <dhowells@...hat.com>
---

 kernel/module-verify.c |    7 +++++++
 1 file changed, 7 insertions(+)


diff --git a/kernel/module-verify.c b/kernel/module-verify.c
index 070d730..c02d2e5 100644
--- a/kernel/module-verify.c
+++ b/kernel/module-verify.c
@@ -124,6 +124,13 @@ int module_verify(const void *data, size_t size, bool *_gpgsig_ok)
 		break;
 	case -ENOKEY:		/* Signed, but we don't have the public key */
 		pr_err("Module signed with unknown public key\n");
+		if (!modsign_signedonly) {
+			/* Allow a module to be signed with an unknown public
+			 * key unless we're enforcing.
+			 */
+			pr_info("Allowing\n");
+			ret = 0;
+		}
 		break;
 	default:		/* Other error (probably ENOMEM) */
 		break;

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