This is a note to let you know that I've just added the patch titled
tpm: vtpm_proxy: Avoid reading host log when using a virtual device
to the 5.12-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
tpm-vtpm_proxy-avoid-reading-host-log-when-using-a-virtual-device.patch
and it can be found in the queue-5.12 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 9716ac65efc8f780549b03bddf41e60c445d4709 Mon Sep 17 00:00:00 2001
From: Stefan Berger <stefanb@xxxxxxxxxxxxx>
Date: Wed, 10 Mar 2021 17:19:16 -0500
Subject: tpm: vtpm_proxy: Avoid reading host log when using a virtual device
From: Stefan Berger <stefanb@xxxxxxxxxxxxx>
commit 9716ac65efc8f780549b03bddf41e60c445d4709 upstream.
Avoid allocating memory and reading the host log when a virtual device
is used since this log is of no use to that driver. A virtual
device can be identified through the flag TPM_CHIP_FLAG_VIRTUAL, which
is only set for the tpm_vtpm_proxy driver.
Cc: stable@xxxxxxxxxxxxxxx
Fixes: 6f99612e2500 ("tpm: Proxy driver for supporting multiple emulated TPMs")
Signed-off-by: Stefan Berger <stefanb@xxxxxxxxxxxxx>
Reviewed-by: Jarkko Sakkinen <jarkko@xxxxxxxxxx>
Signed-off-by: Jarkko Sakkinen <jarkko@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/char/tpm/eventlog/common.c | 3 +++
1 file changed, 3 insertions(+)
--- a/drivers/char/tpm/eventlog/common.c
+++ b/drivers/char/tpm/eventlog/common.c
@@ -107,6 +107,9 @@ void tpm_bios_log_setup(struct tpm_chip
int log_version;
int rc = 0;
+ if (chip->flags & TPM_CHIP_FLAG_VIRTUAL)
+ return;
+
rc = tpm_read_log(chip);
if (rc < 0)
return;
Patches currently in stable-queue which might be from stefanb@xxxxxxxxxxxxx are
queue-5.12/tpm-acpi-check-eventlog-signature-before-using-it.patch
queue-5.12/tpm-efi-use-local-variable-for-calculating-final-log-size.patch
queue-5.12/tpm-vtpm_proxy-avoid-reading-host-log-when-using-a-virtual-device.patch
