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Date: Wed, 11 Sep 2013 14:45:09 -0400 From: Theodore Ts'o <tytso@....edu> To: Andy Lutomirski <luto@...capital.net> Cc: David Safford <safford@...ibm.com>, "H. Peter Anvin" <hpa@...or.com>, Leonidas Da Silva Barbosa <leosilva@...ux.vnet.ibm.com>, Ashley Lai <ashley@...leylai.com>, Rajiv Andrade <mail@...jiv.net>, Marcel Selhorst <tpmdd@...horst.net>, Sirrix AG <tpmdd@...rix.com>, Linux Kernel Mailing List <linux-kernel@...r.kernel.org>, Jeff Garzik <jgarzik@...ox.com>, Kent Yoder <key@...ux.vnet.ibm.com>, David Safford <safford@...son.ibm.com>, Mimi Zohar <zohar@...ibm.com>, "Johnston, DJ" <dj.johnston@...el.com> Subject: Re: TPMs and random numbers On Wed, Sep 11, 2013 at 10:49:59AM -0700, Andy Lutomirski wrote: > > A TPM that has an excellent internal entropy source and is FIPS 140-2 > compliant with no bugs whatsoever may still use Dual_EC_DRBG, which > looks increasingly likely to be actively malicious. To be fair, given the limited CPU found in most TPM's, using Dual_EC_DRBG would be rather unlikely. It's more likely that the TPM would be using a real hardware RNG --- and if the TPM was compromised by some evil spy agency, it would be doing using something like AES_ENCRYPT(i++, NSA_KEY), not using Dual_EC_DRBG. > I'd be *much* happier if my system read a few hundred random bytes > from the TPM at startup and fed those bytes into the kernel's entropy > pool. This should IMO happen at startup as early as possible. We should definitely do this. If the TPM driver could fetch some randomness and then call add_device_randomness() to feed this into the random driver's entropy pool when it initializes itself, that would be ***really*** cool. - Ted -- 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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