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

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Date:	Tue, 14 Aug 2007 23:42:06 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	Hajime Inoue <hinoue@...l.carleton.ca>,
	linux-kernel@...r.kernel.org
Subject: Re: System call interposition/unprotecting the table

> So even with Alan's hypervisor support the whole thing would be still
> quite holey.  The argument of raising the bar also doesn't seem very

Its materially harder, especially with the hypervisor.

> convincing to me, because attackers reuse code too and it's enough
> when someone publishes such code once, then they can cut'n'paste
> it into any exploits forever.

Then you fix the specific case and the game continues.

> In general the .data protection is only considered a debugging
> feature. I don't know why Fedora enables it in their production
> kernels.

That would be because we think you are wrong 8)

Alan
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