linux-kernel - [PATCH 23/25] MODSIGN: Panic the kernel if FIPS is enabled upon module signing failure

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Message-ID: <20120816013824.872.75588.stgit@warthog.procyon.org.uk>
Date:	Thu, 16 Aug 2012 02:38:24 +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 23/25] MODSIGN: Panic the kernel if FIPS is enabled upon
 module signing failure

If module signing fails when the kernel is running with FIPS enabled then the
kernel should panic lest the crypto layer be compromised.  Possibly a panic
shouldn't happen on cases like ENOMEM.

Reported-by: Stephan Mueller <stephan.mueller@...ec.com>
Signed-off-by: David Howells <dhowells@...hat.com>
---

 kernel/module-verify.c |    5 +++++
 1 file changed, 5 insertions(+)


diff --git a/kernel/module-verify.c b/kernel/module-verify.c
index 6684e24..070d730 100644
--- a/kernel/module-verify.c
+++ b/kernel/module-verify.c
@@ -19,6 +19,7 @@
 #include <linux/sched.h>
 #include <linux/modsign.h>
 #include <linux/moduleparam.h>
+#include <linux/fips.h>
 #include <keys/crypto-type.h>
 #include "module-verify.h"
 
@@ -97,6 +98,10 @@ int module_verify(const void *data, size_t size, bool *_gpgsig_ok)
 
 	pr_devel("module_verify_signature() = %d\n", ret);
 
+        if (ret < 0 && fips_enabled)
+                panic("Module verification failed with error %d in FIPS mode\n",
+                      ret);
+
 	switch (ret) {
 	case 0:			/* Good signature */
 		*_gpgsig_ok = true;

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