From: "Steven J. Magnani" <steve@digidescorp.com>
To: Joerg Roedel <joerg.roedel@amd.com>
Cc: monstr@monstr.eu, linux-kernel@vger.kernel.org,
michal.simek@petalogix.com, arnd@arndb.de,
linux-arch@vger.kernel.org, fujita.tomonori@lab.ntt.co.jp,
akpm@linux-foundation.org, mingo@elte.hu
Subject: Re: Generic DMA - BUG_ON
Date: Thu, 21 Jan 2010 09:51:37 -0600 [thread overview]
Message-ID: <1264089097.18869.0.camel@iscandar.digidescorp.com> (raw)
In-Reply-To: <20100120110031.GD8665@amd.com>
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!"
#include <standard.disclaimer>
next prev parent reply other threads:[~2010-01-21 16:00 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-01-20 10:08 Generic DMA - BUG_ON monstr
2010-01-20 10:08 ` monstr
2010-01-20 10:08 ` [PATCH] asm-generic: dma: Add BUG_ON for uninitialized dma_ops monstr
2010-01-20 10:48 ` Alexey Dobriyan
2010-01-20 11:00 ` Geert Uytterhoeven
2010-01-20 10:56 ` Joerg Roedel
2010-01-22 1:11 ` FUJITA Tomonori
2010-01-20 10:53 ` Generic DMA - BUG_ON Russell King
2010-01-20 10:53 ` Russell King
2010-01-20 11:00 ` Joerg Roedel
2010-01-20 11:00 ` Joerg Roedel
2010-01-20 11:18 ` Michal Simek
2010-01-20 19:03 ` Arnd Bergmann
2010-01-21 15:51 ` Steven J. Magnani [this message]
2010-01-21 17:53 ` Russell King
2010-01-21 17:53 ` Russell King
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