linux-kernel - Re: [tip:x86/asm] x86/i386: Make sure stack-protector segment base is cache aligned

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Message-ID: <4AA13C9D.2000401@zytor.com>
Date:	Fri, 04 Sep 2009 09:13:17 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Jeremy Fitzhardinge <jeremy@...p.org>
CC:	Tejun Heo <tj@...nel.org>, mingo@...hat.com,
	linux-kernel@...r.kernel.org, jeremy.fitzhardinge@...rix.com,
	stable@...nel.org, tglx@...utronix.de, mingo@...e.hu,
	linux-tip-commits@...r.kernel.org
Subject: Re: [tip:x86/asm] x86/i386: Make sure stack-protector segment base
 is cache aligned

On 09/04/2009 09:04 AM, Jeremy Fitzhardinge wrote:
> 
> Ideally we'd like to get rid of the constant offset too.  If we could
> change it to %[fg]s:__gcc_stack_canary_offset on both 32-bit and 64-bit,
> it would give us a lot more flexibility.  __gcc_stack_canary_offset
> could be weakly defined to 20/40 for backwards compatibility, but we
> could override it to point to a normal percpu variable.
> 

Yes, although that definitely means starting the gcc pipeline from scratch.

	-hpa

-- 
H. Peter Anvin, Intel Open Source Technology Center
I work for Intel.  I don't speak on their behalf.

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