linux-kernel - Re: [PATCH] KEYS: asym_tpm: Switch to get_random

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Message-ID: <59b88042-9c56-c891-f75e-7c0719eb5ff9@linux.ibm.com>
Date:   Mon, 7 Oct 2019 18:13:01 -0400
From:   Ken Goldman <kgold@...ux.ibm.com>
To:     Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>,
        "Safford, David (GE Global Research, US)" <david.safford@...com>
Cc:     Mimi Zohar <zohar@...ux.ibm.com>,
        "linux-integrity@...r.kernel.org" <linux-integrity@...r.kernel.org>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>,
        "open list:ASYMMETRIC KEYS" <keyrings@...r.kernel.org>,
        "open list:CRYPTO API" <linux-crypto@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] KEYS: asym_tpm: Switch to get_random_bytes()

The TPM library specification states that the TPM must comply with NIST 
SP800-90 A.

https://trustedcomputinggroup.org/membership/certification/tpm-certified-products/

shows that the TPMs get third party certification, Common Criteria EAL 4+.

While it's theoretically possible that an attacker could compromise
both the TPM vendors and the evaluation agencies, we do have EAL 4+ 
assurance against both 1 and 2.

On 10/6/2019 8:05 PM, Jarkko Sakkinen wrote:
> 
> Kernel has the random number generator for two reasons:
> 
> 1. To protect against bugs in hwrng's.
> 2. To protect against deliberate backdoors in hwrng's.
> 
> How TPM RNG is guaranteed to protect against both 1 and 2?