From: Stefan Berger <stefanb@linux.vnet.ibm.com>
To: linux-integrity@vger.kernel.org, jarkko.sakkinen@linux.intel.com,
linux-kernel@vger.kernel.org, linux-acpi@vger.kernel.org,
linux-security-module@vger.kernel.org
Cc: Stefan Berger <stefanb@linux.ibm.com>
Subject: [PATCH v2 3/3] tpm: Add support for ACPI logs from TPM2 ACPI table
Date: Mon, 30 Mar 2020 11:15:36 -0400 [thread overview]
Message-ID: <20200330151536.871700-4-stefanb@linux.vnet.ibm.com> (raw)
In-Reply-To: <20200330151536.871700-1-stefanb@linux.vnet.ibm.com>
From: Stefan Berger <stefanb@linux.ibm.com>
In case of a TPM2 search for a TPM2 ACPI table and if found use it to
find start and length of the log area.
Signed-off-by: Stefan Berger <stefanb@linux.ibm.com>
---
drivers/char/tpm/eventlog/acpi.c | 15 +++++++++++++--
1 file changed, 13 insertions(+), 2 deletions(-)
diff --git a/drivers/char/tpm/eventlog/acpi.c b/drivers/char/tpm/eventlog/acpi.c
index 1ef2267c9378..2447f21e4a23 100644
--- a/drivers/char/tpm/eventlog/acpi.c
+++ b/drivers/char/tpm/eventlog/acpi.c
@@ -49,6 +49,8 @@ int tpm_read_log_acpi(struct tpm_chip *chip)
void __iomem *virt;
u64 len, start;
struct tpm_bios_log *log;
+ struct acpi_table_tpm2 *tbl;
+ int format;
log = &chip->log;
@@ -59,7 +61,15 @@ int tpm_read_log_acpi(struct tpm_chip *chip)
return -ENODEV;
if (chip->flags & TPM_CHIP_FLAG_TPM2) {
- return -ENODEV;
+ status = acpi_get_table("TPM2", 1,
+ (struct acpi_table_header **)&tbl);
+ if (ACPI_FAILURE(status))
+ return -ENODEV;
+ if (tbl->header.length < sizeof(*tbl))
+ return -ENODEV;
+ len = tbl->log_area_minimum_length;
+ start = tbl->log_area_start_address;
+ format = EFI_TCG2_EVENT_LOG_FORMAT_TCG_2;
} else {
/* Find TCPA entry in RSDT (ACPI_LOGICAL_ADDRESSING) */
status = acpi_get_table(ACPI_SIG_TCPA, 1,
@@ -79,6 +89,7 @@ int tpm_read_log_acpi(struct tpm_chip *chip)
start = buff->client.log_start_addr;
break;
}
+ format = EFI_TCG2_EVENT_LOG_FORMAT_TCG_1_2;
}
if (!len) {
dev_warn(&chip->dev, "%s: TCPA log area empty\n", __func__);
@@ -99,7 +110,7 @@ int tpm_read_log_acpi(struct tpm_chip *chip)
memcpy_fromio(log->bios_event_log, virt, len);
acpi_os_unmap_iomem(virt, len);
- return EFI_TCG2_EVENT_LOG_FORMAT_TCG_1_2;
+ return format;
err:
kfree(log->bios_event_log);
--
2.14.5
next prev parent reply other threads:[~2020-03-30 15:15 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-03-30 15:15 [PATCH v2 0/3] tpm2: Make TPM2 logs accessible for non-UEFI firmware Stefan Berger
2020-03-30 15:15 ` [PATCH v2 1/3] acpi: Extend TPM2 ACPI table with missing log fields Stefan Berger
2020-03-30 19:28 ` Jarkko Sakkinen
2020-03-30 21:26 ` Stefan Berger
2020-03-31 11:55 ` Jarkko Sakkinen
2020-03-30 15:15 ` [PATCH v2 2/3] tpm: Rearrange ACPI log code to easier extend for TPM2 case Stefan Berger
2020-03-30 19:32 ` Jarkko Sakkinen
2020-03-30 21:12 ` Stefan Berger
2020-03-31 11:51 ` Jarkko Sakkinen
2020-03-30 15:15 ` Stefan Berger [this message]
2020-03-30 19:54 ` [PATCH v2 3/3] tpm: Add support for ACPI logs from TPM2 ACPI table Jarkko Sakkinen
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