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

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Message-ID: <4516E8EE.1000508@aknet.ru>
Date:	Mon, 25 Sep 2006 00:22:06 +0400
From:	Stas Sergeev <stsp@...et.ru>
To:	Denis Vlasenko <vda.linux@...glemail.com>
Cc:	Ulrich Drepper <drepper@...hat.com>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Hugh Dickins <hugh@...itas.com>,
	Linux kernel <linux-kernel@...r.kernel.org>
Subject: Re: [patch] remove MNT_NOEXEC check for PROT_EXEC mmaps

Hello.

Denis Vlasenko wrote:
> If attacker has malicious loaders on the system,
> the situation is already sort of hopeless.
> Stas, I think noexec mounts are meant to prevent
> _accidental_ execution of binaries/libs from that
> filesystem.
In the past - yes. The problem is that this behaveour
was changed, which is this discussion all about.

> If user wants to execute binary blob from that fs
> bad enough, he will do it. Maybe just by
> copying file first to /tmp.
Not if you mount /tmp with noexec too. At least until
the loader script is written, which is probably some
time ahead. :)

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