linux-kernel - Re: [PATCH 2/6] x86: kaslr: move CPU flags out of cpucheck

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Date:	Fri, 26 Apr 2013 08:28:51 -0700
From:	Kees Cook <keescook@...omium.org>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	"kernel-hardening@...ts.openwall.com" 
	<kernel-hardening@...ts.openwall.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"x86@...nel.org" <x86@...nel.org>,
	Jarkko Sakkinen <jarkko.sakkinen@...el.com>,
	Matthew Garrett <mjg@...hat.com>,
	Matt Fleming <matt.fleming@...el.com>,
	Eric Northup <digitaleric@...gle.com>,
	Dan Rosenberg <drosenberg@...curity.com>,
	Julien Tinnes <jln@...gle.com>, Will Drewry <wad@...omium.org>
Subject: Re: [PATCH 2/6] x86: kaslr: move CPU flags out of cpucheck

On Thu, Apr 25, 2013 at 3:00 PM, H. Peter Anvin <hpa@...or.com> wrote:
> On 04/25/2013 02:54 PM, Kees Cook wrote:
>> Since has_eflag() and has_fpu() are 32-bit only, short-circuit the
>> routines on 64-bit when they are built without -m32. This also refactors
>> the calls to cpuid to make them PIC-safe on 32-bit.
>
> These functions can trivially be made 32- and 64-bit agnostic by
> changing "u32" to "unsigned long" and drop the -l suffixes in the
> assembly code.

Ah, good call. I found what was stopping me earlier. The u32 argument
needed to be switched to unsigned long too. Duh. :)

Thanks!

-Kees

--
Kees Cook
Chrome OS Security
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