** Changed in: linux (Ubuntu Bionic)
Status: In Progress => Fix Committed
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https://bugs.launchpad.net/bugs/1762672
Title:
TPM intermittently fails after cold-boot
Status in linux package in Ubuntu:
Fix Released
Status in linux source package in Bionic:
Fix Committed
Bug description:
[Impact]
On an 18.04 LTS system with a TPM, the TPM will fail intermittently on cold
boots. The problem seems to be that the TPM gets into a state where the partial
self-test doesn't return TPM_RC_SUCCESS (meaning all tests have run to
completion), but instead returns TPM_RC_TESTING (meaning some tests are still
running in the background). A reboot can sometimes restore TPM functionality.
This bug was originally reported on a Dell XPS 13, but has also
recently been reported on a Dell Edge Gateway 3000.
The bug has been confirmed to be fixed in the current development
release (19.04/Cosmic).
[Test Case]
Cold boot a Dell XPS 13 or Dell Edge Gateway 3000 running 18.04 LTS Desktop
or Server and grep for the following error log message:
"tpm tpm0: A TPM error (2314) occurred continue selftest"
Any attempts at using the TPM via tpm2-tss libraries or tpm2-tools
should produce errors.
As this bug is due to a race condition, ideally this test case would
be run multiple times (20+ cold boots).
Once the patch is installed the following error message may still be
present in the syslog, however attempts to use the TPM should work:
"tpm tpm0: A TPM error (2314) occurred attempting the self test"
[Regression Potential]
The chance of regression is low, as this patch was written by a well
respected kernel developer with deep TPM experience. The patch is also being
cherry-picked from the upstream stable and LTS kernels, and as mentioned, has
already landed in Disco.
[Original Description]
After updating a Dell XPS 13 to 18.04 LTS, the TPM started to intermittently
fail on cold boot. The following log messages could be observed in syslog:
[ 0.801334] tpm_tis MSFT0101:00: 2.0 TPM (device-id 0xFE, rev-id 4)
[ 0.812132] tpm tpm0: A TPM error (2314) occurred continue selftest
[ 0.843629] tpm tpm0: A TPM error (2314) occurred continue selftest
[ 0.895424] tpm tpm0: A TPM error (2314) occurred continue selftest
[ 0.987230] tpm tpm0: A TPM error (2314) occurred continue selftest
[ 1.159026] tpm tpm0: A TPM error (2314) occurred continue selftest
[ 1.490819] tpm tpm0: A TPM error (2314) occurred continue selftest
[ 2.142530] tpm tpm0: A TPM error (2314) occurred continue selftest
[ 3.423100] tpm tpm0: TPM self test failed
[ 3.456304] ima: No TPM chip found, activating TPM-bypass! (rc=-19)
Discussion https://lkml.org/lkml/2017/12/6/284
Fix
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/drivers/char/tpm/tpm2-cmd.c?id=2be8ffed093b91536d52b5cd2c99b52f605c9ba6
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