linux-kernel - Re: mmap_min_addr and your local LSM (ok, just SELinux)

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Message-ID: <20090728110028.31fa9a6f@lxorguk.ukuu.org.uk>
Date:	Tue, 28 Jul 2009 11:00:28 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	James Morris <jmorris@...ei.org>,
	James Carter <jwcart2@...ho.nsa.gov>,
	Eric Paris <eparis@...hat.com>, linux-kernel@...r.kernel.org,
	linux-security-module@...r.kernel.org, selinux@...ho.nsa.gov,
	Stephen Smalley <sds@...ho.nsa.gov>, spender@...ecurity.net,
	Daniel J Walsh <dwalsh@...hat.com>, cl@...ux-foundation.org,
	Arjan van de Ven <arjan@...radead.org>, kees@...flux.net,
	Chad Sellers <csellers@...sys.com>,
	Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>,
	mingo@...e.hu
Subject: Re: mmap_min_addr and your local LSM (ok, just SELinux)

On Tue, 28 Jul 2009 11:21:29 +0200
Andi Kleen <andi@...stfloor.org> wrote:

> Alan Cox <alan@...rguk.ukuu.org.uk> writes:
> 
> > A dumb question perhaps, but while addling my brain over the tty layer I
> > was wondering if for the specific case of jump through NULL (which seems
> > to be the most common but by no means only problem case that gets
> > exploited) is there any reason we can't set a default breakpoint for
> 
> You mean a hardware breakpoint? Hardware break points are a precious
> scarce resource. The people who rely on them would be likely
> unhappy if you take one way from them.

They are a tiny minority and could always turn such protection off.
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