linux-kernel - Re: [PATCHv7 0/3] syscalls,x86: Add execveat() system call

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Message-ID: <CAHse=S_uQGmzz+umKDfJPOaT2+TAdzbtjZeVZaj1i4NBVWy35g@mail.gmail.com>
Date:	Thu, 13 Nov 2014 14:42:58 +0000
From:	David Drysdale <drysdale@...gle.com>
To:	Andrew Morton <akpm@...ux-foundation.org>,
	Christoph Hellwig <hch@...radead.org>,
	Rich Felker <dalias@...ifal.cx>
Cc:	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Andy Lutomirski <luto@...capital.net>,
	Alexander Viro <viro@...iv.linux.org.uk>,
	Meredydd Luff <meredydd@...atehouse.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Kees Cook <keescook@...omium.org>,
	Arnd Bergmann <arnd@...db.de>, X86 ML <x86@...nel.org>,
	linux-arch <linux-arch@...r.kernel.org>,
	Linux API <linux-api@...r.kernel.org>
Subject: Re: [PATCHv7 0/3] syscalls,x86: Add execveat() system call

On Wed, Nov 12, 2014 at 9:50 PM, Andrew Morton
<akpm@...ux-foundation.org> wrote:
> On Fri,  7 Nov 2014 17:01:01 +0000 David Drysdale <drysdale@...gle.com> wrote:
>
>> This patch set adds execveat(2) for x86, and is derived from Meredydd
>> Luff's patch from Sept 2012 (https://lkml.org/lkml/2012/9/11/528).
>>
>> The primary aim of adding an execveat syscall is to allow an
>> implementation of fexecve(3) that does not rely on the /proc
>> filesystem, at least for executables (rather than scripts).  The
>> current glibc version of fexecve(3) is implemented via /proc, which
>> causes problems in sandboxed or otherwise restricted environments.
>
> Have the relevant glibc people seen/reviewed/liked this?

I think it's been mentioned in passing but not explicitly discussed over there
(https://sourceware.org/ml/libc-alpha/2014-10/msg00497.html,
https://sourceware.org/ml/libc-alpha/2014-10/msg00509.html)
and a couple of the participants in that thread (Christoph Hellwig, Rich Felker)
were also cc:ed here.

It sounded like execveat might be useful for another feature (O_EXEC) but
I'm not sure whether that amounts to the relevant glibc folk liking this...
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