From: Jarkko Sakkinen <jarkko@kernel.org>
To: Matthew Garrett <mgarrett@aurora.tech>
Cc: Ken Goldman <kgold@linux.ibm.com>,
Evan Green <evgreen@chromium.org>,
linux-kernel@vger.kernel.org, dlunev@google.com,
zohar@linux.ibm.com, jejb@linux.ibm.com,
linux-integrity@vger.kernel.org, corbet@lwn.net,
rjw@rjwysocki.net, gwendal@chromium.org,
linux-pm@vger.kernel.org, Len Brown <len.brown@intel.com>,
Pavel Machek <pavel@ucw.cz>,
"Rafael J. Wysocki" <rafael@kernel.org>
Subject: Re: TPM: hibernate with IMA PCR 10
Date: Wed, 31 Aug 2022 05:48:25 +0300 [thread overview]
Message-ID: <Yw7L+X2cHf9qprxl@kernel.org> (raw)
In-Reply-To: <CAHSSk06+CNQLKS8p_jh8JH7acn6=Ck8W3W2DM75rV3paZQ+MbA@mail.gmail.com>
On Mon, Aug 29, 2022 at 02:51:50PM -0700, Matthew Garrett wrote:
> On Mon, Aug 29, 2022 at 2:45 PM Ken Goldman <kgold@linux.ibm.com> wrote:
> >
> > On 5/4/2022 7:20 PM, Evan Green wrote:
> > > Enabling the kernel to be able to do encryption and integrity checks on
> > > the hibernate image prevents a malicious userspace from escalating to
> > > kernel execution via hibernation resume. [snip]
> >
> > I have a related question.
> >
> > When a TPM powers up from hibernation, PCR 10 is reset. When a
> > hibernate image is restored:
> >
> > 1. Is there a design for how PCR 10 is restored?
>
> I don't see anything that does that at present.
>
> > 2. How are /sys/kernel/security/ima/[pseudofiles] saved and
> > restored?
>
> They're part of the running kernel state, so should re-appear without
> any special casing. However, in the absence of anything repopulating
> PCR 10, they'll no longer match the in-TPM value.
This feature could still be supported, if IMA is disabled
in the kernel configuration, which I see a non-issue as
long as config flag checks are there.
BR, Jarkko
next prev parent reply other threads:[~2022-08-31 2:48 UTC|newest]
Thread overview: 42+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-05-04 23:20 [PATCH 00/10] Encrypted Hibernation Evan Green
2022-05-04 23:20 ` [PATCH 01/10] tpm: Add support for in-kernel resetting of PCRs Evan Green
2022-05-04 23:20 ` [PATCH 02/10] tpm: Allow PCR 23 to be restricted to kernel-only use Evan Green
2022-05-04 23:20 ` [PATCH 03/10] security: keys: trusted: Parse out individual components of the key blob Evan Green
2022-05-04 23:20 ` [PATCH 04/10] security: keys: trusted: Allow storage of PCR values in creation data Evan Green
2022-08-02 23:00 ` Eric Biggers
2022-08-03 20:48 ` Evan Green
2022-05-04 23:20 ` [PATCH 05/10] security: keys: trusted: Verify " Evan Green
2022-05-04 23:20 ` [PATCH 06/10] PM: hibernate: Add kernel-based encryption Evan Green
2022-08-29 21:45 ` TPM: hibernate with IMA PCR 10 Ken Goldman
2022-08-29 21:51 ` Matthew Garrett
2022-08-31 2:48 ` Jarkko Sakkinen [this message]
2022-09-07 20:47 ` Evan Green
2022-09-07 23:57 ` Mimi Zohar
2022-09-08 5:25 ` Jarkko Sakkinen
2022-09-11 2:40 ` Mimi Zohar
2022-09-20 4:36 ` Jarkko Sakkinen
2022-09-21 20:15 ` Mimi Zohar
2022-09-23 13:30 ` Jarkko Sakkinen
2022-09-27 16:03 ` Evan Green
2022-09-28 9:42 ` Jonathan McDowell
2022-05-04 23:20 ` [PATCH 07/10] PM: hibernate: Use TPM-backed keys to encrypt image Evan Green
2022-05-04 23:21 ` [PATCH 08/10] PM: hibernate: Mix user key in encrypted hibernate Evan Green
2022-05-06 16:08 ` Pavel Machek
2022-05-09 16:44 ` Evan Green
2022-05-10 12:29 ` Pavel Machek
2022-05-10 16:02 ` Evan Green
2022-08-02 22:48 ` Eric Biggers
2022-08-03 20:48 ` Evan Green
2022-05-04 23:21 ` [PATCH 09/10] PM: hibernate: Verify the digest encryption key Evan Green
2022-08-02 22:51 ` Eric Biggers
2022-05-04 23:21 ` [PATCH 10/10] PM: hibernate: seal the encryption key with a PCR policy Evan Green
2022-05-06 16:08 ` [PATCH 00/10] Encrypted Hibernation Pavel Machek
2022-05-09 16:43 ` Evan Green
2022-05-17 16:06 ` Rafael J. Wysocki
2022-05-17 17:34 ` Evan Green
2022-06-16 15:42 ` Evan Green
2022-08-01 22:32 ` Evan Green
2022-08-02 18:36 ` Matthew Garrett
2022-08-04 0:59 ` Jarkko Sakkinen
2022-08-04 21:55 ` Evan Green
2022-08-06 18:21 ` Jarkko Sakkinen
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