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Message-ID: <5179A797.9040200@zytor.com>
Date: Thu, 25 Apr 2013 15:00:55 -0700
From: "H. Peter Anvin" <hpa@...or.com>
To: Kees Cook <keescook@...omium.org>
CC: linux-kernel@...r.kernel.org, kernel-hardening@...ts.openwall.com,
Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>,
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 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.
-hpa
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