lists.openwall.net   lists  /  announce  owl-users  owl-dev  john-users  john-dev  passwdqc-users  yescrypt  popa3d-users  /  oss-security  kernel-hardening  musl  sabotage  tlsify  passwords  /  crypt-dev  xvendor  /  Bugtraq  Full-Disclosure  linux-kernel  linux-netdev  linux-ext4  linux-hardening  linux-cve-announce  PHC 
Open Source and information security mailing list archives
 
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [thread-next>] [day] [month] [year] [list]
Message-ID: <50EFDF15.4080606@csamuel.org>
Date:	Fri, 11 Jan 2013 20:44:53 +1100
From:	Chris Samuel <chris@...muel.org>
To:	linux-kernel@...r.kernel.org
CC:	Rusty Russell <rusty@...tcorp.com.au>, dhowells@...hat.com
Subject: [PATCH] MODSIGN: Warn when sign check fails due to -ENOKEY

/* Please CC me in responses, I am not subscribed to LKML */

Currently if a signature check fails on module load due to not having
the appropriate key (-ENOKEY) and we are not doing strict checking
there is no information provided to the user other than the lock debug
taint warning:

Disabling lock debugging due to kernel taint

This patch causes a single warning to be emitted to explain why the
kernel is being tainted, before the above taint warning occurs.

Module verification failed, required key not present, tainting kernel

Found whilst trying to work out why all the 3.8 development kernels
I was building and testing were warning about taints and why all modules
were listed as forced load (F) in /proc/modules when that wasn't the
case in the 3.5, 3.6 or 3.7 kernels I'd tried.

Signed-off-by: Christopher Samuel <chris@...muel.org>
---
  kernel/module.c |    4 +++-
  1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/kernel/module.c b/kernel/module.c
index 250092c..27de534 100644
--- a/kernel/module.c
+++ b/kernel/module.c
@@ -2443,8 +2443,10 @@ static int module_sig_check(struct load_info *info)
  	if (err < 0 && fips_enabled)
  		panic("Module verification failed with error %d in FIPS mode\n",
  		      err);
-	if (err == -ENOKEY && !sig_enforce)
+	if (err == -ENOKEY && !sig_enforce) {
+		printk_once(KERN_DEBUG "Module verification failed, required key not 
present, tainting kernel\n");
  		err = 0;
+	}
   	return err;
  }
-- 
1.7.10.4


View attachment "Attached Message Part" of type "text/plain" (0 bytes)

Powered by blists - more mailing lists