linux-kernel - Re: [PATCH] dma-mapping: Add BUG_ON for uninitialized dma

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Message-Id: <201306191720.47185.arnd@arndb.de>
Date:	Wed, 19 Jun 2013 17:20:46 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	James Bottomley <James.Bottomley@...senpartnership.com>
Cc:	Marek Szyprowski <m.szyprowski@...sung.com>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Michal Simek <michal.simek@...inx.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Michal Simek <monstr@...str.eu>,
	"Linux-Arch" <linux-arch@...r.kernel.org>
Subject: Re: [PATCH] dma-mapping: Add BUG_ON for uninitialized dma_ops

On Friday 14 June 2013, James Bottomley wrote:
> This is the MMAP_PAGE_ZERO exploit.  The original exploit relied on a
> leaky personality capability clearing mask and was fixed in 2.6.31 by
> 
> commit f9fabcb58a6d26d6efde842d1703ac7cfa9427b6
> Author: Julien Tinnes <jt@....org>
> Date:   Fri Jun 26 20:27:40 2009 +0200
> 
>     personality: fix PER_CLEAR_ON_SETID
> 
> So it's not really relevant to 3.x kernels, is it?

Probably not. There is always a risk that something like this
can turn into an exploit, but it needs a combination with a couple
of other bugs.

	Arnd
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