linux-kernel - Re: [PATCH 1/1] tpm: disable hwrng for fTPM on some AMD designs

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:   Mon, 31 Jul 2023 16:28:13 -0700
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     "Limonciello, Mario" <mario.limonciello@....com>
Cc:     linux@...inikbrodowski.net, Jarkko Sakkinen <jarkko@...nel.org>,
        Daniil Stas <daniil.stas@...teo.net>,
        James.Bottomley@...senpartnership.com, Jason@...c4.com,
        linux-integrity@...r.kernel.org, linux-kernel@...r.kernel.org,
        regressions@...mhuis.info, stable@...r.kernel.org
Subject: Re: [PATCH 1/1] tpm: disable hwrng for fTPM on some AMD designs

On Mon, 31 Jul 2023 at 14:57, Limonciello, Mario
<mario.limonciello@....com> wrote:
>
> Are you thinking then to unregister the tpm hwrng "sometime" after boot?

No, I was more thinking that instead of registering it as a randomness
source, you'd just do a one-time

    tpm_get_random(..);
    add_hwgenerator_randomness(..);

and leave it at that.

Even if there is some stutter due to some crazy firmware
implementation for reading the random data, at boot time nobody will
notice it.

           Linus