linux-kernel - Re: [PATCH] allow execve'ing "/proc/self/exe" even if /proc is not mounted

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Message-ID: <1158166a0906261555k3f00e9bdi74960e9eb72a4bb7@mail.gmail.com>
Date:	Sat, 27 Jun 2009 00:55:32 +0200
From:	Denys Vlasenko <vda.linux@...glemail.com>
To:	Mike Frysinger <vapier.adi@...il.com>
Cc:	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Al Viro <viro@...iv.linux.org.uk>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH] allow execve'ing "/proc/self/exe" even if /proc is not 
	mounted

On Fri, Jun 26, 2009 at 3:26 PM, Mike Frysinger<vapier.adi@...il.com> wrote:
> On Fri, Jun 26, 2009 at 04:00, Denys Vlasenko wrote:
>> On Thu, Jun 25, 2009 at 10:10 AM, Alan Cox wrote:
>>>> With this patch, it is possible to execute /proc/self/exe
>>>> even if /proc is not mounted. In the below example,
>>>> ./sh is a static shell binary:
>>>
>>> What if the user has procfs mounted somewherelse, what if they are in a
>>> chroot where you don't want them to patch the binary and re-exec it ?
>>>
>>> It would be far far cleaner for NOMMU to have a NOMMU private "reexec()"
>>> call that didn't rely on procfs or hacking names into the kernel.
>>>
>>> So NAK
>>
>> I am ok with it. Are other people ok with adding a syscall
>> just for this purpose? Al?
>
> please try a custom binfmt first

I did not understand you.
--
vda
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