tpm: add securityfs support for TPM 2.0 firmware event log

Unlike the device driver support for TPM 1.2, the TPM 2.0 does
not support the securityfs pseudo files for displaying the
firmware event log.

This patch enables support for providing the TPM 2.0 event log in
binary form. TPM 2.0 event log supports a crypto agile format that
records multiple digests, which is different from TPM 1.2. This
patch enables the tpm_bios_log_setup for TPM 2.0  and adds the
event log parser which understand the TPM 2.0 crypto agile format.

Signed-off-by: Nayna Jain <nayna@linux.vnet.ibm.com>
Reviewed-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Tested-by: Kenneth Goldman <kgold@linux.vnet.ibm.com>
Tested-by: Stefan Berger <stefanb@linux.vnet.ibm.com>
Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>

1 files changed, 46 insertions, 5 deletions

diff --git a/drivers/char/tpm/tpm_eventlog.h b/drivers/char/tpm/tpm_eventlog.h
index 1660d74ea79a..b4b549559203 100644
--- a/drivers/char/tpm/tpm_eventlog.h
+++ b/drivers/char/tpm/tpm_eventlog.h
@@ -2,9 +2,12 @@
 #ifndef __TPM_EVENTLOG_H__
 #define __TPM_EVENTLOG_H__
 
+#include <crypto/hash_info.h>
+
 #define TCG_EVENT_NAME_LEN_MAX	255
 #define MAX_TEXT_EVENT		1000	/* Max event string length */
 #define ACPI_TCPA_SIG		"TCPA"	/* 0x41504354 /'TCPA' */
+#define TPM2_ACTIVE_PCR_BANKS	3
 
 #ifdef CONFIG_PPC64
 #define do_endian_conversion(x) be32_to_cpu(x)
@@ -17,11 +20,6 @@ enum bios_platform_class {
 	BIOS_SERVER = 0x01,
 };
 
-struct tpm_bios_log {
-	void *bios_event_log;
-	void *bios_event_log_end;
-};
-
 struct tcpa_event {
 	u32 pcr_index;
 	u32 event_type;
@@ -73,6 +71,49 @@ enum tcpa_pc_event_ids {
 	HOST_TABLE_OF_DEVICES,
 };
 
+/* http://www.trustedcomputinggroup.org/tcg-efi-protocol-specification/ */
+
+struct tcg_efi_specid_event_algs {
+	u16 alg_id;
+	u16 digest_size;
+} __packed;
+
+struct tcg_efi_specid_event {
+	u8 signature[16];
+	u32 platform_class;
+	u8 spec_version_minor;
+	u8 spec_version_major;
+	u8 spec_errata;
+	u8 uintnsize;
+	u32 num_algs;
+	struct tcg_efi_specid_event_algs digest_sizes[TPM2_ACTIVE_PCR_BANKS];
+	u8 vendor_info_size;
+	u8 vendor_info[0];
+} __packed;
+
+struct tcg_pcr_event {
+	u32 pcr_idx;
+	u32 event_type;
+	u8 digest[20];
+	u32 event_size;
+	u8 event[0];
+} __packed;
+
+struct tcg_event_field {
+	u32 event_size;
+	u8 event[0];
+} __packed;
+
+struct tcg_pcr_event2 {
+	u32 pcr_idx;
+	u32 event_type;
+	u32 count;
+	struct tpm2_digest digests[TPM2_ACTIVE_PCR_BANKS];
+	struct tcg_event_field event;
+} __packed;
+
+extern const struct seq_operations tpm2_binary_b_measurements_seqops;
+
 #if defined(CONFIG_ACPI)
 int tpm_read_log_acpi(struct tpm_chip *chip);
 #else