linux-kernel - Re: Generic DMA

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Date:	Thu, 21 Jan 2010 09:51:37 -0600
From:	"Steven J. Magnani" <steve@...idescorp.com>
To:	Joerg Roedel <joerg.roedel@....com>
Cc:	monstr@...str.eu, linux-kernel@...r.kernel.org,
	michal.simek@...alogix.com, arnd@...db.de,
	linux-arch@...r.kernel.org, fujita.tomonori@....ntt.co.jp,
	akpm@...ux-foundation.org, mingo@...e.hu
Subject: Re: Generic DMA - BUG_ON

On Wed, 2010-01-20 at 12:00 +0100, Joerg Roedel wrote:
> On Wed, Jan 20, 2010 at 10:53:50AM +0000, Russell King wrote:
> > and ops is NULL, then this code will oops; you will get a full register
> > dump and backtrace.  You can use this information along with markup_oops.pl
> > to find out where the problem is.
> 
> You can't rely on the oops if the code runs in process context. The
> process may have address 0 mapped which would result in a security hole.
> We had two of these bugs last year.

You also can't rely on an oops in a NOMMU environment.

------------------------------------------------------------------------
 Steven J. Magnani               "I claim this network for MARS!
 www.digidescorp.com              Earthling, return my space modulator!"

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