linux-kernel - Re: [PATCH]: x86_64, audio: Fix system panic when DMA

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <51820968.7080303@sgi.com>
Date:	Wed, 01 May 2013 23:36:24 -0700
From:	Mike Travis <travis@....com>
To:	David Henningsson <david.henningsson@...onical.com>
CC:	Stephen Warren <swarren@...dia.com>,
	Jaroslav Kysela <perex@...ex.cz>, Takashi Iwai <tiwai@...e.de>,
	Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>,
	alsa-devel@...a-project.org, linux-kernel@...r.kernel.org,
	Russ Anderson <rja@....com>
Subject: Re: [PATCH]: x86_64, audio: Fix system panic when DMA > 40 bits



On 5/1/2013 11:20 PM, David Henningsson wrote:
> On 05/01/2013 09:04 PM, Mike Travis wrote:
>> The audio driver mistakenly allows 64 bit addresses to be created for
>> the audio driver on Nvidia GPUs.  Unfortunately, the hardware normally
>> only supports up to 40 bits of DMA.  This can cause system panics as
>> well as misdirected data when the address is > 40 bits as the upper
>> part the address is truncated.
> 
> Thanks for this patch. Stephen Warren, is this something you can
> confirm/deny, and do you know what range of hardware this actually
> applies to?

The dma_mask can be read from the gpu device's pci entry.  I know it's
a stretch to try to link to that but past history has shown that it
ranges from 36 to 40 bits.

> 
>>
>> Signed-off-by: Mike Travis <travis@....com>
>> Reviewed-by: Mike Habeck <habeck@....com>
>> ---
>>   sound/pci/hda/hda_intel.c | 2 +-
>>   1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/sound/pci/hda/hda_intel.c b/sound/pci/hda/hda_intel.c
>> index bcd40ee..45eb165 100644
>> --- a/sound/pci/hda/hda_intel.c
>> +++ b/sound/pci/hda/hda_intel.c
>> @@ -615,7 +615,7 @@ enum {
>>   /* quirks for Nvidia */
>>   #define AZX_DCAPS_PRESET_NVIDIA \
>>       (AZX_DCAPS_NVIDIA_SNOOP | AZX_DCAPS_RIRB_DELAY |
>> AZX_DCAPS_NO_MSI |\
>> -     AZX_DCAPS_ALIGN_BUFSIZE)
>> +     AZX_DCAPS_ALIGN_BUFSIZE | AZX_DCAPS_NO_64BIT)
>>
>>   #define AZX_DCAPS_PRESET_CTHDA \
>>       (AZX_DCAPS_NO_MSI | AZX_DCAPS_POSFIX_LPIB |
>> AZX_DCAPS_4K_BDLE_BOUNDARY)
>>
> 
> 
> 
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/