linux-kernel - Re: [GIT PULL] Asymmetric keys and module signing

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Message-ID: <20121001204150.GA20849@hansolo.jdub.homelinux.org>
Date:	Mon, 1 Oct 2012 16:41:50 -0400
From:	Josh Boyer <jwboyer@...hat.com>
To:	David Howells <dhowells@...hat.com>
Cc:	Rusty Russell <rusty@...tcorp.com.au>,
	herbert@...dor.hengli.com.au, pjones@...hat.com,
	linux-crypto@...r.kernel.org,
	linux-security-module@...r.kernel.org,
	linux-kernel@...r.kernel.org, keyrings@...ux-nfs.org
Subject: Re: [GIT PULL] Asymmetric keys and module signing

On Sat, Sep 29, 2012 at 08:13:25AM +0100, David Howells wrote:
> Rusty Russell <rusty@...tcorp.com.au> wrote:
> 
> > [    2.808075] Loading module verification certificates
> > [    2.809331] X.509: Cert 6e03943da0f3b015ba6ed7f5e0cac4fe48680994 has expired
> > [    2.810500] MODSIGN: Problem loading in-kernel X.509 certificate (-127)
> 
> Hmmm...  Other people have seen that.
> 
> Ahhhhh!
> 
> I wonder if the problem is that the certificate is valid for 100 years....
> That might well cause an overflow on a 32-bit system.

That does seem quite plausible.  The comparisons are done with time_t,
which boils down to 'long' and 100 years in seconds would overflow
LONG_MAX.

> Could you try changing the '36500' in kernel/Makefile to something shorter,
> like 365?

I tried two values today.  One close to LONG_MAX (24800 or ~68 years),
and 10 years (3650).  The former still seemed to overflow, but
specifying a 10yr lifetime appears to have worked.

josh
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