linux-kernel - Re: [patch] remove MNT_NOEXEC check for PROT

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Message-ID: <45240D4E.7090500@aknet.ru>
Date:	Wed, 04 Oct 2006 23:36:46 +0400
From:	Stas Sergeev <stsp@...et.ru>
To:	Arjan van de Ven <arjan@...radead.org>
Cc:	Ulrich Drepper <drepper@...hat.com>,
	Linux kernel <linux-kernel@...r.kernel.org>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Hugh Dickins <hugh@...itas.com>, Valdis.Kletnieks@...edu
Subject: Re: [patch] remove MNT_NOEXEC check for PROT_EXEC mmaps

Hi.

Arjan van de Ven wrote:
> and chmod o-x bash ....
> at which point.. game over.
> (and yes you can do in bash pretty much what you can do in perl. heck
> you can prove that.. shell is turning complete ;)
Can I do a syscalls from a bash script?
But in any case, I am not going to suggest any
solution against a script-loader - the mmap change
doesn't prevent that too.
Instead I'd like to evaluate a few ideas about an
ld.so problem. One of which is to _enforce_ the "noexec",
just as you asked for. :)
Please have a look at this patch:
http://uwsg.ucs.indiana.edu/hypermail/linux/kernel/0610.0/1402.html
The primary goal is to make access() to respect the "noexec".

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