From: Stefan Berger <stefanb@linux.ibm.com>
To: peterhuewe@gmx.de, jarkko@kernel.org
Cc: jgg@ziepe.ca, linux-integrity@vger.kernel.org,
linux-security-module@vger.kernel.org,
linux-kernel@vger.kernel.org,
Stefan Berger <stefanb@linux.ibm.com>
Subject: [PATCH v2 3/3] tpm: vtpm_proxy: Avoid reading host log when using a virtual device
Date: Wed, 10 Mar 2021 17:19:16 -0500 [thread overview]
Message-ID: <20210310221916.356716-4-stefanb@linux.ibm.com> (raw)
In-Reply-To: <20210310221916.356716-1-stefanb@linux.ibm.com>
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.
Fixes: 6f99612e2500 ("tpm: Proxy driver for supporting multiple emulated TPMs")
Signed-off-by: Stefan Berger <stefanb@linux.ibm.com>
---
drivers/char/tpm/eventlog/common.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/drivers/char/tpm/eventlog/common.c b/drivers/char/tpm/eventlog/common.c
index 7460f230bae4..8512ec76d526 100644
--- 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 *chip)
int log_version;
int rc = 0;
+ if (chip->flags & TPM_CHIP_FLAG_VIRTUAL)
+ return;
+
rc = tpm_read_log(chip);
if (rc < 0)
return;
--
2.29.2
next prev parent reply other threads:[~2021-03-10 22:20 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-03-10 22:19 [PATCH v2 0/3] Fix bugs related to TPM2 event log Stefan Berger
2021-03-10 22:19 ` [PATCH v2 1/3] tpm: efi: Use local variable for calculating final log size Stefan Berger
2021-03-10 23:14 ` Jarkko Sakkinen
2021-03-10 23:21 ` Jarkko Sakkinen
2021-03-10 23:24 ` Jarkko Sakkinen
2021-03-11 14:02 ` Stefan Berger
2021-03-12 16:54 ` Jarkko Sakkinen
2021-03-10 22:19 ` [PATCH v2 2/3] tpm: acpi: Check eventlog signature before using it Stefan Berger
2021-03-10 23:13 ` Jarkko Sakkinen
2021-03-10 22:19 ` Stefan Berger [this message]
2021-03-10 23:04 ` [PATCH v2 3/3] tpm: vtpm_proxy: Avoid reading host log when using a virtual device Jarkko Sakkinen
2021-03-10 23:04 ` [PATCH v2 0/3] Fix bugs related to TPM2 event log Jarkko Sakkinen
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