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Message-Id: <1411549562-24242-4-git-send-email-jarkko.sakkinen@linux.intel.com>
Date: Wed, 24 Sep 2014 12:05:53 +0300
From: Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
To: tpmdd-devel@...ts.sourceforge.net
Cc: Peter Huewe <peterhuewe@....de>,
Marcel Selhorst <tpmdd@...horst.net>,
linux-kernel@...r.kernel.org, jgunthorpe@...idianresearch.com,
Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
Subject: [PATCH v1 03/12] tpm: TPM2 support for tpm_pcr_read()
Implemented TPM2 support for tpm_pcr_read() by adding a new function
tpm2_pcr_read_dev() that is called for TPM2 chipsets.
Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
---
drivers/char/tpm/tpm-interface.c | 5 ++++-
drivers/char/tpm/tpm.h | 21 ++++++++++++++++++++
drivers/char/tpm/tpm2-commands.c | 43 ++++++++++++++++++++++++++++++++++++++++
drivers/char/tpm/tpm2.h | 18 +++++++++++++++++
4 files changed, 86 insertions(+), 1 deletion(-)
diff --git a/drivers/char/tpm/tpm-interface.c b/drivers/char/tpm/tpm-interface.c
index 07a2fc5..4494b16 100644
--- a/drivers/char/tpm/tpm-interface.c
+++ b/drivers/char/tpm/tpm-interface.c
@@ -680,7 +680,10 @@ int tpm_pcr_read(u32 chip_num, int pcr_idx, u8 *res_buf)
chip = tpm_chip_find_get(chip_num);
if (chip == NULL)
return -ENODEV;
- rc = tpm_pcr_read_dev(chip, pcr_idx, res_buf);
+ if (chip->tpm2)
+ rc = tpm2_pcr_read_dev(chip, pcr_idx, res_buf);
+ else
+ rc = tpm_pcr_read_dev(chip, pcr_idx, res_buf);
tpm_chip_put(chip);
return rc;
}
diff --git a/drivers/char/tpm/tpm.h b/drivers/char/tpm/tpm.h
index bda88aa..10d6731 100644
--- a/drivers/char/tpm/tpm.h
+++ b/drivers/char/tpm/tpm.h
@@ -298,6 +298,25 @@ struct tpm_startup_in {
__be16 startup_type;
} __packed;
+struct tpm2_pcr_read_in {
+ __be32 pcr_selects_cnt;
+ __be16 hash_alg;
+ u8 pcr_select_size;
+ u8 pcr_select[TPM2_PCR_SELECT_MIN];
+} __packed;
+
+
+struct tpm2_pcr_read_out {
+ __be32 update_cnt;
+ __be32 pcr_selects_cnt;
+ __be16 hash_alg;
+ u8 pcr_select_size;
+ u8 pcr_select[TPM2_PCR_SELECT_MIN];
+ __be32 digests_cnt;
+ __be16 digest_size;
+ u8 digest[TPM_DIGEST_SIZE];
+} __packed;
+
typedef union {
struct tpm_getcap_params_out getcap_out;
struct tpm_readpubek_params_out readpubek_out;
@@ -309,6 +328,8 @@ typedef union {
struct tpm_getrandom_in getrandom_in;
struct tpm_getrandom_out getrandom_out;
struct tpm_startup_in startup_in;
+ struct tpm2_pcr_read_in tpm2_pcrread_in;
+ struct tpm2_pcr_read_out tpm2_pcrread_out;
} tpm_cmd_params;
struct tpm_cmd_t {
diff --git a/drivers/char/tpm/tpm2-commands.c b/drivers/char/tpm/tpm2-commands.c
index 14b3ae7..2fb553c 100644
--- a/drivers/char/tpm/tpm2-commands.c
+++ b/drivers/char/tpm/tpm2-commands.c
@@ -157,3 +157,46 @@ unsigned long tpm2_calc_ordinal_duration(struct tpm_chip *chip, u32 ordinal)
else
return duration;
}
+
+#define TPM2_PCR_READ_IN_SIZE \
+ (sizeof(struct tpm_input_header) + \
+ sizeof(struct tpm2_pcr_read_in))
+
+static struct tpm_input_header tpm2_pcrread_header = {
+ .tag = cpu_to_be16(TPM2_ST_NO_SESSIONS),
+ .length = cpu_to_be32(TPM2_PCR_READ_IN_SIZE),
+ .ordinal = cpu_to_be32(TPM2_CC_PCR_READ)
+};
+
+int tpm2_pcr_read_dev(struct tpm_chip *chip, int pcr_idx, u8 *res_buf)
+{
+ int rc;
+ struct tpm_cmd_t cmd;
+ u8 *buf;
+ int i, j;
+
+ if (pcr_idx >= TPM2_PLATFORM_PCR)
+ return -EINVAL;
+
+ cmd.header.in = tpm2_pcrread_header;
+ cmd.params.tpm2_pcrread_in.pcr_selects_cnt = cpu_to_be32(1);
+ cmd.params.tpm2_pcrread_in.hash_alg = cpu_to_be16(TPM2_ALG_SHA1);
+ cmd.params.tpm2_pcrread_in.pcr_select_size = TPM2_PCR_SELECT_MIN;
+
+ for (i = 0; i < TPM2_PCR_SELECT_MIN; i++) {
+ j = pcr_idx - i * 8;
+
+ cmd.params.tpm2_pcrread_in.pcr_select[i] =
+ (j >= 0 && j < 8) ? 1 << j : 0;
+ }
+
+ rc = tpm_transmit_cmd(chip, &cmd, sizeof(cmd),
+ "attempting to read a pcr value");
+
+ if (rc == 0) {
+ buf = cmd.params.tpm2_pcrread_out.digest;
+ memcpy(res_buf, buf, TPM_DIGEST_SIZE);
+ }
+
+ return rc;
+}
diff --git a/drivers/char/tpm/tpm2.h b/drivers/char/tpm/tpm2.h
index dc0a2a2..fbab49c 100644
--- a/drivers/char/tpm/tpm2.h
+++ b/drivers/char/tpm/tpm2.h
@@ -16,11 +16,29 @@
#ifndef __DRIVERS_CHAR_TPM2_H__
#define __DRIVERS_CHAR_TPM2_H__
+enum tpm2_const {
+ TPM2_PLATFORM_PCR = 24,
+ TPM2_PCR_SELECT_MIN = ((TPM2_PLATFORM_PCR + 7) / 8),
+};
+
+enum tpm2_structures {
+ TPM2_ST_NO_SESSIONS = 0x8001,
+};
+
+enum tpm2_algorithms {
+ TPM2_ALG_SHA1 = 0x0004,
+};
+
+enum tpm2_command_codes {
+ TPM2_CC_PCR_READ = 0x017E,
+};
+
struct tpm_chip;
#define TPM2_CC_FIRST 0x11F
#define TPM2_CC_LAST 0x18F
unsigned long tpm2_calc_ordinal_duration(struct tpm_chip *, u32);
+int tpm2_pcr_read_dev(struct tpm_chip *chip, int pcr_idx, u8 *res_buf);
#endif /* __DRIVERS_CHAR_TPM2_H__ */
--
2.1.0
--
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