Re: [PATCH 3/3] tpm: Fix TPM 1.2 Shutdown sequence to prevent future TPM operations

From: Sasha Levin
Date: Wed Oct 02 2019 - 11:17:55 EST


On Wed, Oct 02, 2019 at 03:57:58PM +0200, Greg KH wrote:
On Wed, Oct 02, 2019 at 04:14:44PM +0300, Jarkko Sakkinen wrote:
From: Vadim Sukhomlinov <sukhomlinov@xxxxxxxxxx>

commit db4d8cb9c9f2af71c4d087817160d866ed572cc9 upstream

TPM 2.0 Shutdown involve sending TPM2_Shutdown to TPM chip and disabling
future TPM operations. TPM 1.2 behavior was different, future TPM
operations weren't disabled, causing rare issues. This patch ensures
that future TPM operations are disabled.

Fixes: d1bd4a792d39 ("tpm: Issue a TPM2_Shutdown for TPM2 devices.")
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Vadim Sukhomlinov <sukhomlinov@xxxxxxxxxx>
[dianders: resolved merge conflicts with mainline]
Signed-off-by: Douglas Anderson <dianders@xxxxxxxxxxxx>
Reviewed-by: Jarkko Sakkinen <jarkko.sakkinen@xxxxxxxxxxxxxxx>
Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@xxxxxxxxxxxxxxx>
---
drivers/char/tpm/tpm-chip.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)

What kernel version(s) is this for?

It would go to 4.19, we've recently reverted an incorrect backport of
this patch.

Jarkko, why is this patch 3/3? We haven't seen the first two on the
mailing list, do we need anything besides this patch?

--
Thanks,
Sasha