linux-kernel - Re: Userspace process may be able to DoS kernel

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Message-ID: <474c7c2f0610121325j23320d36i20c71ccaa04645d9@mail.gmail.com>
Date:	Thu, 12 Oct 2006 16:25:57 -0400
From:	"Günther Starnberger" <gst@...frog.org>
To:	jplatte@...sa.net
Cc:	"Pekka Enberg" <penberg@...helsinki.fi>,
	linux-kernel@...r.kernel.org
Subject: Re: Userspace process may be able to DoS kernel

On 10/12/06, Joerg Platte <lists@...sa.net> wrote:

> Not that easy, since it takes a few hours to be able to trigger the bug. I
> tried to record the system calls with strace but without success. Skype did
> not cause any lockups and then crashes... Maybe the timing is too different
> with strace.

According to [1] there are several anti-debugging techniques used in
Skype. I.e. if it notices some sort of debugger it will crash (on
purpose).

bye,
/gst

[1] www.blackhat.com/presentations/bh-europe-06/bh-eu-06-biondi/bh-eu-06-biondi-up.pdf
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