Re: MODSIGN: Modules fail signature verification with -ENOKEY

[Chris Samuel <chris@csamuel.org>]

/* 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