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

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Message-ID: <45180F36.8010908@aknet.ru>
Date:	Mon, 25 Sep 2006 21:17:42 +0400
From:	Stas Sergeev <stsp@...et.ru>
To:	Arjan van de Ven <arjan@...radead.org>
Cc:	Andrew Morton <akpm@...l.org>,
	Linux kernel <linux-kernel@...r.kernel.org>,
	Valdis.Kletnieks@...edu
Subject: Re: [patch] remove MNT_NOEXEC check for PROT_EXEC mmaps

Hi Arjan.

Arjan van de Ven wrote:
> ... to add a "security" feature?
> sounds like the wrong tradeoff!
There is now an ongoing discussion about that here:
http://uwsg.ucs.indiana.edu/hypermail/linux/kernel/0609.2/2151.html
continues here:
http://uwsg.ucs.indiana.edu/hypermail/linux/kernel/0609.3/0008.html
with many posts already.
I'd like you to contribute to it.

In particular, I would be very happy if you (or anyone
else) will tell me why the noexec filesystem deny PROT_EXEC
for MAP_PRIVATE, while even the R/O filesystem doesn't deny
PROT_WRITE for MAP_PRIVATE? This is one of the key points of
mine, but there are others too.

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