linux-kernel - Re: [PATCH] Check files' signatures before doing suid/sgid [2/4]

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Message-ID: <Pine.LNX.4.64.0706232001070.11964@fbirervta.pbzchgretzou.qr>
Date:	Sat, 23 Jun 2007 20:01:29 +0200 (CEST)
From:	Jan Engelhardt <jengelh@...putergmbh.de>
To:	Alexander Wuerstlein <snalwuer@....informatik.uni-erlangen.de>
cc:	Arjan van de Ven <arjan@...radead.org>,
	linux-kernel@...r.kernel.org, arw@....name
Subject: Re: [PATCH] Check files' signatures before doing suid/sgid [2/4]


On Jun 21 2007 19:46, Alexander Wuerstlein wrote:
>
>If a process uses read() it needs some executable and writable memory. We do
>check for this in mprotect(). There is a problem with the i386-architecture,
>because it allows execution of any readable page (except with newer
>processors). But beyond that ugliness of i386, it should not be possible to
>execute anything without us noticing it (hopefully).

r and x together is not a problem IMHO.


	Jan
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