linux-kernel - Re: System call interposition/unprotecting the table

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Message-ID: <20070814000956.7c8929dd@the-village.bc.nu>
Date:	Tue, 14 Aug 2007 00:09:56 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	hinoue@...l.carleton.ca
Cc:	linux-kernel@...r.kernel.org
Subject: Re: System call interposition/unprotecting the table

On Mon, 13 Aug 2007 18:05:35 -0400
hinoue@...l.carleton.ca wrote:

> I have a question about changing the page attributes of the
> system call table.

Please don't do that.

> This works fine on my debian system, but apparently the stock Fedora
> kernel (2.6.22) has the system call table write protected.  

This is to protect it from being changed by an attacker or someone trying
to do strange and bogus things to the kernel.

What are you actually trying to achieve ?
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