From: Jarkko Sakkinen <jarkko@kernel.org>
To: James Bottomley <jejb@linux.ibm.com>
Cc: Evan Green <evgreen@chromium.org>,
linux-kernel@vger.kernel.org, corbet@lwn.net,
linux-integrity@vger.kernel.org,
Eric Biggers <ebiggers@kernel.org>,
gwendal@chromium.org, dianders@chromium.org,
apronin@chromium.org, Pavel Machek <pavel@ucw.cz>,
Ben Boeckel <me@benboeckel.net>,
rjw@rjwysocki.net, Kees Cook <keescook@chromium.org>,
dlunev@google.com, zohar@linux.ibm.com,
Matthew Garrett <mgarrett@aurora.tech>,
linux-pm@vger.kernel.org, Matthew Garrett <mjg59@google.com>,
Jason Gunthorpe <jgg@ziepe.ca>, Peter Huewe <peterhuewe@gmx.de>
Subject: Re: [PATCH v5 03/11] tpm: Allow PCR 23 to be restricted to kernel-only use
Date: Sun, 27 Nov 2022 18:33:41 +0200 [thread overview]
Message-ID: <Y4ORZT2t/KhL5jfn@kernel.org> (raw)
In-Reply-To: <8ae56656a461d7b957b93778d716c6161070383a.camel@linux.ibm.com>
On Mon, Nov 14, 2022 at 12:11:20PM -0500, James Bottomley wrote:
> On Fri, 2022-11-11 at 15:16 -0800, Evan Green wrote:
> > Introduce a new Kconfig, TCG_TPM_RESTRICT_PCR, which if enabled
> > restricts usermode's ability to extend or reset PCR 23.
>
> Could I re ask the question here that I asked of Matthew's patch set:
>
> https://lore.kernel.org/all/b0c4980c8fad14115daa3040979c52f07f7fbe2c.camel@linux.ibm.com/
>
> Which was could we use an NVRAM index in the TPM instead of a PCR? The
> reason for asking was that PCRs are rather precious and might get more
> so now that Lennart has some grand scheme for using more of them in his
> unified boot project. Matthew promised to play with the idea but never
> got back to the patch set to say whether he investigated this or not.
Even for PCR case it would be better to have it configurable through
kernel command-line, including a disabled state, which would the
default.
This would be backwards compatible, and if designed properly, could
more easily extended for NV index later on.
BR, Jarkko
next prev parent reply other threads:[~2022-11-27 16:33 UTC|newest]
Thread overview: 61+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-11-11 23:16 [PATCH v5 00/11] Encrypted Hibernation Evan Green
2022-11-11 23:16 ` [PATCH v5 01/11] tpm: Add support for in-kernel resetting of PCRs Evan Green
2022-11-13 20:31 ` Eric Biggers
2022-11-27 16:06 ` Jarkko Sakkinen
2022-11-27 16:07 ` Jarkko Sakkinen
2022-11-11 23:16 ` [PATCH v5 02/11] tpm: Export and rename tpm2_find_and_validate_cc() Evan Green
2022-11-11 23:16 ` [PATCH v5 03/11] tpm: Allow PCR 23 to be restricted to kernel-only use Evan Green
2022-11-13 20:46 ` Eric Biggers
2022-11-14 17:11 ` James Bottomley
2022-11-27 16:33 ` Jarkko Sakkinen [this message]
2022-11-27 16:41 ` James Bottomley
2022-11-30 20:22 ` Dr. Greg
2022-11-30 21:34 ` Casey Schaufler
2022-12-02 1:10 ` Dr. Greg
2023-01-03 20:42 ` Matthew Garrett
2023-01-03 21:04 ` William Roberts
2023-01-03 21:10 ` Matthew Garrett
2023-01-14 14:55 ` James Bottomley
2023-01-14 15:11 ` William Roberts
2023-01-15 3:05 ` Matthew Garrett
2023-01-15 14:41 ` William Roberts
2023-01-17 21:26 ` James Bottomley
2023-01-21 3:29 ` Jarkko Sakkinen
2023-01-23 17:48 ` William Roberts
2023-01-24 11:51 ` Dr. Greg
2023-01-24 12:38 ` James Bottomley
2023-01-24 15:05 ` William Roberts
2023-01-26 17:21 ` Jarkko Sakkinen
2023-01-26 17:32 ` William Roberts
2023-01-26 21:30 ` Jarkko Sakkinen
2023-01-26 22:01 ` William Roberts
2023-02-07 23:20 ` Jarkko Sakkinen
2023-01-26 17:07 ` Jarkko Sakkinen
2023-01-26 17:12 ` Jarkko Sakkinen
2023-01-26 17:20 ` William Roberts
2023-01-10 16:07 ` William Roberts
2022-11-27 16:29 ` Jarkko Sakkinen
2022-11-11 23:16 ` [PATCH v5 04/11] security: keys: trusted: Include TPM2 creation data Evan Green
2022-11-13 21:20 ` Eric Biggers
2022-11-14 3:32 ` James Bottomley
2022-11-14 16:32 ` Evan Green
2022-11-14 16:56 ` James Bottomley
2022-11-14 17:43 ` Evan Green
2022-11-14 18:00 ` James Bottomley
2022-12-02 21:03 ` James Bottomley
2022-12-05 18:43 ` Evan Green
2022-11-11 23:16 ` [PATCH v5 05/11] security: keys: trusted: Allow storage of PCR values in " Evan Green
2022-11-13 22:01 ` Eric Biggers
2022-11-11 23:16 ` [PATCH v5 06/11] security: keys: trusted: Verify " Evan Green
2022-11-13 22:13 ` Eric Biggers
2022-11-11 23:16 ` [PATCH v5 07/11] PM: hibernate: Add kernel-based encryption Evan Green
2022-11-13 22:55 ` Eric Biggers
2022-11-11 23:16 ` [PATCH v5 08/11] PM: hibernate: Use TPM-backed keys to encrypt image Evan Green
2022-11-13 23:33 ` Eric Biggers
2022-11-11 23:16 ` [PATCH v5 09/11] PM: hibernate: Mix user key in encrypted hibernate Evan Green
2022-11-13 23:44 ` Eric Biggers
2022-11-11 23:16 ` [PATCH v5 10/11] PM: hibernate: Verify the digest encryption key Evan Green
2022-11-13 23:47 ` Eric Biggers
2022-11-11 23:16 ` [PATCH v5 11/11] PM: hibernate: seal the encryption key with a PCR policy Evan Green
2022-11-13 23:51 ` Eric Biggers
2022-12-07 23:54 ` [PATCH v5 00/11] Encrypted Hibernation Evan Green
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