linux-kernel - Re: [patch] honour MNT

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Message-ID: <4529D2AD.9080509@aknet.ru>
Date:	Mon, 09 Oct 2006 08:40:13 +0400
From:	Stas Sergeev <stsp@...et.ru>
To:	"Horst H. von Brand" <vonbrand@....utfsm.cl>
Cc:	Arjan van de Ven <arjan@...radead.org>,
	Ulrich Drepper <drepper@...hat.com>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Jakub Jelinek <jakub@...hat.com>,
	Linux kernel <linux-kernel@...r.kernel.org>,
	Hugh Dickins <hugh@...itas.com>,
	Jeremy Fitzhardinge <jeremy@...p.org>
Subject: Re: [patch] honour MNT_NOEXEC for access()

Hello.

Horst H. von Brand wrote:
> Right. But what prevents anybody to have a hacked, non-testing, ld.so lying
> around?
Having "noexec" on every user-writable mount can
kind of make that difficult - you can't easily run
the ld.so you just copied in.

> It just can't do them (reliably at least) in general.
Certainly it can't, now and then.
Right now the check is to see whether the mmap(PROT_EXEC)
fails. I wanted to change that to something that at least
won't break other apps, but of course without adding any
extra reliability.

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