linux-integrity.vger.kernel.org archive mirror
 help / color / mirror / Atom feed
From: Mimi Zohar <zohar@linux.ibm.com>
To: "Michael Niewöhner" <linux@mniewoehner.de>,
	"Jarkko Sakkinen" <jarkko.sakkinen@linux.intel.com>,
	"James Bottomley" <James.Bottomley@HansenPartnership.com>,
	peterhuewe@gmx.de, jgg@ziepe.ca, arnd@arndb.de,
	linux-integrity@vger.kernel.org,
	linux-kernel <linux-kernel@vger.kernel.org>,
	"Nayna Jain" <nayna@linux.ibm.com>,
	"Ken Goldman" <kgold@linux.ibm.com>
Subject: Re: tpm_tis TPM2.0 not detected on cold boot
Date: Tue, 01 Jan 2019 11:38:21 -0500	[thread overview]
Message-ID: <1546360701.4069.168.camel@linux.ibm.com> (raw)
In-Reply-To: <0902784697eea3fc522e21a89cdecb745f12c83c.camel@mniewoehner.de>

On Tue, 2019-01-01 at 17:15 +0100, Michael Niewöhner wrote:
> On Mon, 2018-12-31 at 16:17 -0500, Mimi Zohar wrote:
> > On Sun, 2018-12-30 at 14:22 +0100, Michael Niewöhner wrote:
> > 
> > > > difference is that on a cold boot, the TPM takes longer to initialize.
> > > 
> > > Well, as I said. Waiting for 10, 20 or even 60 seconds in the boot manager
> > > does
> > > not solve the problem. So the problem is NOT that the TPM takes longer to
> > > initialize. Even adding a delay of 20 seconds before TPM init does not solve
> > > that while that should be more than enough time.
> > 
> > The purpose of commenting out the TPM2 selftest was to minimize the
> > TPM initialization delay, so that the TPM is ready before IMA.  After
> > James' patch that wasn't needed anymore.
> > 
> > Looking back at this thread, I see you're using systemd-boot, not
> > grub2.  When you commented out the systemd-boot timeout, IMA found the
> > TPM.  The question is why isn't the TPM ready with the timeout before
> > IMA (like above)?  Has systemd-boot done the selftest?
> 
> I am not sure wether systemd-boot touches TPM at all but I get the same
> behaviour with syslinux-efi.

From looking at the source code, it depends on whether systemd was
compiled with ENABLE_TPM enabled(eg. src/boot/efi/boot.c,
src/boot/efi/measure.c, src/boot/efi/stub.c).

Mimi


  reply	other threads:[~2019-01-01 16:38 UTC|newest]

Thread overview: 26+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-12-16 13:32 tpm_tis TPM2.0 not detected on cold boot Michael Niewöhner
2018-12-22 13:47 ` Michael Niewöhner
2018-12-22 22:53   ` Mimi Zohar
2018-12-23 11:55     ` Michael Niewöhner
2018-12-25 13:55       ` Michael Niewöhner
2018-12-30  3:33         ` Mimi Zohar
2018-12-30 13:22           ` Michael Niewöhner
2018-12-31 18:10             ` Ken Goldman
2018-12-31 21:17             ` Mimi Zohar
2019-01-01 16:15               ` Michael Niewöhner
2019-01-01 16:38                 ` Mimi Zohar [this message]
2019-01-01 16:47                   ` Michael Niewöhner
2018-12-31 17:56           ` Ken Goldman
2019-01-03 13:27       ` Jarkko Sakkinen
2019-01-03 13:38         ` Michael Niewöhner
2019-01-03 15:04           ` Jarkko Sakkinen
2019-01-03 15:47             ` Michael Niewöhner
2019-01-04 11:58               ` Michael Niewöhner
2019-01-04 15:28                 ` Michael Niewöhner
2019-01-04 18:26                   ` Michael Niewöhner
2019-01-10 17:28                   ` Jarkko Sakkinen
2019-01-10 18:03                     ` Michael Niewöhner
2019-01-10 17:19               ` Jarkko Sakkinen
2019-01-10 18:00                 ` Michael Niewöhner
2019-01-03 13:41 ` Jarkko Sakkinen
2019-01-03 13:55   ` Michael Niewöhner

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=1546360701.4069.168.camel@linux.ibm.com \
    --to=zohar@linux.ibm.com \
    --cc=James.Bottomley@HansenPartnership.com \
    --cc=arnd@arndb.de \
    --cc=jarkko.sakkinen@linux.intel.com \
    --cc=jgg@ziepe.ca \
    --cc=kgold@linux.ibm.com \
    --cc=linux-integrity@vger.kernel.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=linux@mniewoehner.de \
    --cc=nayna@linux.ibm.com \
    --cc=peterhuewe@gmx.de \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).