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

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Message-ID: <20090625091002.0b8203a7@lxorguk.ukuu.org.uk>
Date:	Thu, 25 Jun 2009 09:10:02 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Denys Vlasenko <vda.linux@...glemail.com>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Mike Frysinger <vapier@...too.org>
Subject: Re: [PATCH] allow execve'ing "/proc/self/exe" even if /proc is not
  mounted

> 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

Alan
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