linux-kernel - Re: MODSIGN: Modules fail signature verification with -ENOKEY

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-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <50F10278.3050309@csamuel.org>
Date:	Sat, 12 Jan 2013 17:28:08 +1100
From:	Chris Samuel <chris@...muel.org>
To:	Josh Boyer <jwboyer@...il.com>
CC:	linux-kernel@...r.kernel.org,
	Rusty Russell <rusty@...tcorp.com.au>, dhowells@...hat.com
Subject: Re: MODSIGN: Modules fail signature verification with -ENOKEY

/* Please CC, not on LKML */

Hi Josh,

On 12/01/13 00:44, Josh Boyer wrote:

> Check the installed modules.  A simple:
>
>      hexdump -C <path to module> | tail -n 20
>
> should be enough to tell you if the installed modules at least look like
> they're signed.  You should see the expected "~Module signature appended~"
> string.  You could also check the modules in the kernel build tree for
> the same thing. [...]

Good call - neither the modules in the build tree, nor the installed 
ones are signed.   I did a "make mrproper", changed scripts/sign-file to 
be verbose by default and rebuilt.  That confirmed that the modules are 
getting signed, which left the possibility of make-kpkg stripping the 
modules after compiling as an option.

Google pointed me at the likely culprit, a patch from a certain Mr Ted 
Ts'o in 2009 to make-kpkg so that it would strip kernel modules by default.

http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=517290

I'll file a bug against it asking for the it to not strip if 
CONFIG_MODULE_SIG is set.

Thanks for the pointer!
Chris
-- 
  Chris Samuel  :  http://www.csamuel.org/  :  Melbourne, VIC
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/