linux-kernel - Re: [PATCH 06/30] sysinfo: Use explicit types in <linux/sysinfo.h>

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Date:	Mon, 20 Feb 2012 12:44:17 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Geert Uytterhoeven <geert@...ux-m68k.org>
CC:	linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org,
	mingo@...nel.org, tglx@...utronix.de,
	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	hjl.tools@...il.com
Subject: Re: [PATCH 06/30] sysinfo: Use explicit types in <linux/sysinfo.h>

On 02/20/2012 12:01 PM, Geert Uytterhoeven wrote:
> On Mon, Feb 20, 2012 at 18:29, H. Peter Anvin <hpa@...or.com> wrote:
>> Not really... it comes down to "implicit padding in kernel ABI structures is bad".  They can easily become security holes.
> 
> On 64-bit platforms with natural alignment of long, there's an implicit padding.
> 

We should try to make those explicit, but it sometimes gets hard
retroactively.  Note that the particular patch you're pointing to is
just an identity patch.

	-hpa

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

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