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

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Message-Id: <1570024819.4999.119.camel@linux.ibm.com>
Date:   Wed, 02 Oct 2019 10:00:19 -0400
From:   Mimi Zohar <zohar@...ux.ibm.com>
To:     Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>,
        linux-integrity@...r.kernel.org
Cc:     stable@...r.kernel.org, David Howells <dhowells@...hat.com>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        "David S. Miller" <davem@...emloft.net>,
        "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()

On Thu, 2019-09-26 at 20:16 +0300, Jarkko Sakkinen wrote:
> Only the kernel random pool should be used for generating random numbers.
> TPM contributes to that pool among the other sources of entropy. In here it
> is not, agreed, absolutely critical because TPM is what is trusted anyway
> but in order to remove tpm_get_random() we need to first remove all the
> call sites.

At what point during boot is the kernel random pool available?  Does
this imply that you're planning on changing trusted keys as well?

Mimi