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References: <1415379664-31555-1-git-send-email-drysdale@google.com> <20141112135009.5a887d200be262d94ba50495@linux-foundation.org>
From: David Drysdale <drysdale@google.com>
Date: Thu, 13 Nov 2014 14:42:58 +0000
Message-ID: <CAHse=S_uQGmzz+umKDfJPOaT2+TAdzbtjZeVZaj1i4NBVWy35g@mail.gmail.com>
Subject: Re: [PATCHv7 0/3] syscalls,x86: Add execveat() system call
To: Andrew Morton <akpm@linux-foundation.org>,
        Christoph Hellwig <hch@infradead.org>, Rich Felker <dalias@aerifal.cx>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>,
        Andy Lutomirski <luto@amacapital.net>,
        Alexander Viro <viro@zeniv.linux.org.uk>,
        Meredydd Luff <meredydd@senatehouse.org>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        Thomas Gleixner <tglx@linutronix.de>, Ingo Molnar <mingo@redhat.com>,
        "H. Peter Anvin" <hpa@zytor.com>, Kees Cook <keescook@chromium.org>,
        Arnd Bergmann <arnd@arndb.de>, X86 ML <x86@kernel.org>,
        linux-arch <linux-arch@vger.kernel.org>,
        Linux API <linux-api@vger.kernel.org>
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Sender: linux-kernel-owner@vger.kernel.org

On Wed, Nov 12, 2014 at 9:50 PM, Andrew Morton
<akpm@linux-foundation.org> wrote:
> On Fri,  7 Nov 2014 17:01:01 +0000 David Drysdale <drysdale@google.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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