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Re: [PATCH] replace SYSV shared memory with shm filesystem

To: Christoph Rohland <hans-christoph.rohland@sap.com>
Subject: Re: [PATCH] replace SYSV shared memory with shm filesystem
From: Rik van Riel <riel@nl.linux.org>
Date: Mon, 10 Jan 2000 13:52:01 +0100 (CET)
cc: MM mailing list <linux-mm@kvack.org>, Linux Kernel Mailing List <linux-kernel@vger.rutgers.edu>, "Eric W. Biederman" <ebiederm+eric@ccr.net>, Alexander Viro <viro@math.psu.edu>, Alan Cox <alan@lxorguk.ukuu.org.uk>, GOTO Masanori <gotom@debian.or.jp>
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On 10 Jan 2000, Christoph Rohland wrote:

> You can mount the fs only once. This will probably break shm in
> chrooted environments.

I think it would be best to code it in such a way that you
can mount multiple instances of shmfs, in such a way that
the differently chrooted programs cannot see each other's
shared memory. That should make it a bit more difficult to
get out of a chroot() jail...

(security buffs, please tell me if I'm full of it)

cheers,

Rik
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References:
- [PATCH] replace SYSV shared memory with shm filesystem
  - From: Christoph Rohland <hans-christoph.rohland@sap.com>

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