linux-kernel - Re: [PATCH 2/2] hw_random: add support for the TPM chip as a hardware RNG source

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Date:	Thu, 26 Jul 2012 15:28:14 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Kent Yoder <key@...ux.vnet.ibm.com>
CC:	linux-kernel@...r.kernel.org, tpmdd-devel@...ts.sourceforge.net,
	m.selhorst@...rix.com, safford@...ibm.com,
	Jeff Garzik <jeff@...zik.org>
Subject: Re: [PATCH 2/2] hw_random: add support for the TPM chip as a hardware
 RNG source

On 07/26/2012 02:58 PM, H. Peter Anvin wrote:
> On 06/07/2012 11:47 AM, Kent Yoder wrote:
>> This driver will make use of any available TPM chip on the system as a
>> hwrng source.
>>
>> Signed-off-by: Kent Yoder <key@...ux.vnet.ibm.com>
>> ---
>>   drivers/char/hw_random/Kconfig   |   13 +++++++++
>>   drivers/char/hw_random/Makefile  |    1 +
>>   drivers/char/hw_random/tpm-rng.c |   55
>> ++++++++++++++++++++++++++++++++++++++
>>   3 files changed, 69 insertions(+), 0 deletions(-)
>>   create mode 100644 drivers/char/hw_random/tpm-rng.c
>>
>
> So I just noticed this patch being pushed.
>
> /dev/hw_random is used by rngd, which already has support for the TPM
> directly.  However, the TPM support in rngd conflict with tcsd (from
> TrouSerS).
>
> Does this driver solve the coexistence problem?  If so, this is a Very
> Good Thing and should be accepted (and the TPM support in rngd
> deprecated/removed.)
>
> If it does *not* solve the coexistence problem, then it just prevents a
> user space solution and the patch really should be rejected.
>
> It would be great to get that clarified as soon as possible.
>

To answer my own question: this *does* seem to resolve the coexistence 
problem.  However, please see the type violation/memory overwrite bug I 
posted about in my other mail.

	-hpa


-- 
H. Peter Anvin, Intel Open Source Technology Center
I work for Intel.  I don't speak on their behalf.

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