linux-kernel - Re: [PATCH] [RFC] syscalls,x86: Add execveat() system call (v2)

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Message-ID: <5019BC0E.4010109@zytor.com>
Date:	Wed, 01 Aug 2012 16:30:22 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Meredydd Luff <meredydd@...atehouse.org>
CC:	linux-kernel@...r.kernel.org, Kees Cook <keescook@...omium.org>,
	Ingo Molnar <mingo@...hat.com>, Jeff Dike <jdike@...toit.com>,
	Richard Weinberger <richard@....at>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH] [RFC] syscalls,x86: Add execveat() system call (v2)

On 08/01/2012 04:09 PM, Meredydd Luff wrote:
>>>  #
>>>  # x32-specific system call numbers start at 512 to avoid cache impact
>>
>> I think that should be common, not 64 (as should kcmp be).
> 
> I copied the original execve, which is 64.
> 

Sorry, you're right.  The argument vector needs compatibility support.

This means you need an x32 version of the function -- execve
unfortunately is one of the few system calls which require a special x32
version (although it's a simple wrapper around sys32_execve).  See
sys_x32_execve.

	-hpa

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