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Date: Fri, 27 Jul 2012 08:08:28 -0700 From: "H. Peter Anvin" <hpa@...or.com> To: Kent Yoder <key@...ux.vnet.ibm.com> CC: James Morris <jmorris@...ei.org>, Peter Huewe <peter.huewe@...ineon.com>, Bryan Freed <bfreed@...omium.org>, linux-kernel@...r.kernel.org, linux-security-module@...r.kernel.org Subject: Re: [GIT PULL] New TPM driver and features On 07/27/2012 07:29 AM, Kent Yoder wrote: > Hi, > > On Thu, Jul 26, 2012 at 02:46:25PM -0700, H. Peter Anvin wrote: >> On 07/26/2012 07:31 AM, Kent Yoder wrote: >>> hw_random: add support for the TPM chip as a hardware RNG source >> >> Could you clarify this? rngd (the user of /dev/hw_random) already >> has support for the TPM... is this fundamentally different (e.g. can >> it coexist with tcsd being in use at the same time)? > > These can coexist at the same time since /dev/tpm0 is only opened once > from user-space (from tcsd) and this hwrng driver comes in through the > kernel. There would be some amount of contention with the tpm, but its > not likely to be noticable - grabbing rng data doesn't require any state > in the tpm, like an auth session or key loading. > > Since the rngd support for the tpm requires trousers, this patch will > be useful in places where you don't want to have to deploy the full TSS, > like embedded and early boot. > Actually the rngd support for the TPM *conflicts* with trousers... I was looking at adding trousers support when I stumbled over your patch. Your patch is better, because it solves the handover problem (rngd should normally be started as early as possible.) -hpa -- H. Peter Anvin, Intel Open Source Technology Center I work for Intel. I don't speak on their behalf. -- 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/
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