linux-kernel - Re: [PATCH] x86: make PTRACE_GETREGSET return 32-bit regs if 64-bit process entered kernel with int 80

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Message-ID: <511D2779.7040504@zytor.com>
Date:	Thu, 14 Feb 2013 10:05:45 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Oleg Nesterov <oleg@...hat.com>
CC:	Denys Vlasenko <dvlasenk@...hat.com>, linux-kernel@...r.kernel.org,
	Andi Kleen <andi@...stfloor.org>
Subject: Re: [PATCH] x86: make PTRACE_GETREGSET return 32-bit regs if 64-bit
 process entered kernel with int 80

On 02/14/2013 07:00 AM, Oleg Nesterov wrote:
> On 02/14, Denys Vlasenko wrote:
>>
>> Determining personality of a ptraced process is a murky area.
>> On x86, for years strace was looking at segment selectors,
>> which is conceptually wrong: see, for example,
>> https://lkml.org/lkml/2012/1/18/320
>>

One proposal that keeps being on the table is to export a regset with 
metadatam, including process mode at launch (i386, x86-64, x32).

	-hpa

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

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