linux-kernel - Re: [tip:x86/asm] x86-64, copy_user: Remove zero byte check before copy user buffer.

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Message-ID: <528AEB27.2070404@zytor.com>
Date:	Mon, 18 Nov 2013 20:37:59 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Ingo Molnar <mingo@...nel.org>
CC:	Peter Anvin <hpa@...ux.intel.com>, tglx@...utronix.de,
	linux-tip-commits@...r.kernel.org, fenghua.yu@...el.com,
	linux-kernel@...r.kernel.org
Subject: Re: [tip:x86/asm] x86-64, copy_user: Remove zero byte check before
 copy user buffer.

On 11/16/2013 10:44 PM, Linus Torvalds wrote:
> So this doesn't do the 32-bit truncation in the error path of the generic
> string copy. Oversight?
> 
>        Linus

Hi Linus,

Do you have a preference:

1. Considering the 32-bit truncation incidental (take it or leave it);
2. Require the 32-bit truncation, or
3. Get rid of it completely?

	-hpa


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