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Groups > linux.kernel > #1557618 > unrolled thread

[PATCH v3 0/2] tpm: enhance TPM 2.0 extend function to support multiple PCR banks

Started byNayna Jain <nayna@linux.vnet.ibm.com>
First post2017-01-12 18:00 +0100
Last post2017-01-13 17:50 +0100
Articles 5 — 3 participants

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Contents

  [PATCH v3 0/2] tpm: enhance TPM 2.0 extend function to support multiple PCR banks  Nayna Jain <nayna@linux.vnet.ibm.com> - 2017-01-12 18:00 +0100
    [PATCH v3 2/2] tpm: enhance TPM 2.0 PCR extend to support multiple banks Nayna Jain <nayna@linux.vnet.ibm.com> - 2017-01-12 18:00 +0100
      Re: [PATCH v3 2/2] tpm: enhance TPM 2.0 PCR extend to support  multiple banks Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com> - 2017-01-12 19:30 +0100
        Re: [PATCH v3 2/2] tpm: enhance TPM 2.0 PCR extend to support  multiple banks Nayna <nayna@linux.vnet.ibm.com> - 2017-01-13 09:50 +0100
          Re: [PATCH v3 2/2] tpm: enhance TPM 2.0 PCR extend to support  multiple banks Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com> - 2017-01-13 17:50 +0100

#1557618 — [PATCH v3 0/2] tpm: enhance TPM 2.0 extend function to support multiple PCR banks

FromNayna Jain <nayna@linux.vnet.ibm.com>
Date2017-01-12 18:00 +0100
Subject[PATCH v3 0/2] tpm: enhance TPM 2.0 extend function to support multiple PCR banks
Message-ID<sYQTg-6jV-25@gated-at.bofh.it>
IMA extends its hash measurements in the TPM PCRs, based on policy.
The existing in-kernel TPM extend function extends only the SHA1
PCR bank. TPM 2.0 defines multiple PCR banks, to support different
hash algorithms. The TCG TPM 2.0 Specification[1] recommends
extending all active PCR banks to prevent malicious users from
setting unused PCR banks with fake measurements and quoting them.
This patch set adds support for extending all active PCR banks,
as recommended.

The first patch implements the TPM 2.0 capability to retrieve
the list of active PCR banks.

The second patch modifies the tpm_pcr_extend() and tpm2_pcr_extend()
interface to support extending multiple PCR banks. The existing
tpm_pcr_extend() interface expects only a SHA1 digest. Hence, to
extend all active PCR banks with differing digest sizes for TPM 2.0,
the SHA1 digest is padded with 0's as needed.

This approach is taken to maintain backwards compatibility for IMA
in order to continue working with both TPM 1.2 and TPM 2.0 without
any changes and still comply with TCG TPM 2.0 Specification[1].

[1] TPM 2.0 Specification referred here is "TCG PC Client Specific
Platform Firmware Profile for TPM 2.0"

Changelog v3:
- Rebased to the Jarkko's latest master branch (8e25809 tpm:
  Do not print an error message when doing TPM auto startup)
- Patch "tpm: implement TPM 2.0 capability to get active PCR banks"
  - Included Jarkko's feedbacks
     - Removed getcap_in, getcap_out and used tpm_buf for getting
     capability.
     - Used ARRAY_SIZE in place of TPM_MAX_PCR_BANKS and included
     other feedbacks.
- Patch "tpm: enhance TPM 2.0 PCR extend to support multiple banks"
     - Fixed kbuild errors
       - Fixed buf.data uninitialized warning.
       - Added TCG_TPM dependency on CONFIG_CRYPTO_HASH_INFO in Kconfig.

Changelog v2:

- Patch "tpm: implement TPM 2.0 capability to get active PCR banks"
  - defined structs definition in tpm2-cmd.c.
  - no_of_active_banks field is removed. Instead, constant
  TPM2_MAX_PCR_BANKS is defined.
  - renamed tpm2_get_active_pcr_banks() to tpm2_get_pcr_allocation()
  - removed generic function tpm2_get_capability().

- Patch "tpm: enchance TPM 2.0 PCR extend to support multiple banks"
 - Removed tpm2.h, and defined structs common for extend and event log
  in tpm_eventlog.h
 - uses tpm_buf in tpm2_pcr_extend().

Nayna Jain (2):
  tpm: implement TPM 2.0 capability to get active PCR banks
  tpm: enhance TPM 2.0 PCR extend to support multiple banks

 drivers/char/tpm/Kconfig         |   1 +
 drivers/char/tpm/tpm-interface.c |  16 ++++-
 drivers/char/tpm/tpm.h           |   7 ++-
 drivers/char/tpm/tpm2-cmd.c      | 127 ++++++++++++++++++++++++++++++---------
 drivers/char/tpm/tpm_eventlog.h  |  18 ++++++
 5 files changed, 138 insertions(+), 31 deletions(-)

-- 
2.5.0

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#1557619 — [PATCH v3 2/2] tpm: enhance TPM 2.0 PCR extend to support multiple banks

FromNayna Jain <nayna@linux.vnet.ibm.com>
Date2017-01-12 18:00 +0100
Subject[PATCH v3 2/2] tpm: enhance TPM 2.0 PCR extend to support multiple banks
Message-ID<sYQTg-6jV-33@gated-at.bofh.it>
In reply to#1557618
The current TPM 2.0 device driver extends only the SHA1 PCR bank
but the TCG Specification[1] recommends extending all active PCR
banks, to prevent malicious users from setting unused PCR banks with
fake measurements and quoting them.

The existing in-kernel interface(tpm_pcr_extend()) expects only a
SHA1 digest.  To extend all active PCR banks with differing
digest sizes, the SHA1 digest is padded with trailing 0's as needed.

[1] TPM 2.0 Specification referred here is "TCG PC Client Specific
Platform Firmware Profile for TPM 2.0"

Signed-off-by: Nayna Jain <nayna@linux.vnet.ibm.com>
---
 drivers/char/tpm/Kconfig         |  1 +
 drivers/char/tpm/tpm-interface.c | 16 +++++++++-
 drivers/char/tpm/tpm.h           |  3 +-
 drivers/char/tpm/tpm2-cmd.c      | 68 +++++++++++++++++++++++-----------------
 drivers/char/tpm/tpm_eventlog.h  | 18 +++++++++++
 5 files changed, 75 insertions(+), 31 deletions(-)

diff --git a/drivers/char/tpm/Kconfig b/drivers/char/tpm/Kconfig
index 277186d..af985cc 100644
--- a/drivers/char/tpm/Kconfig
+++ b/drivers/char/tpm/Kconfig
@@ -6,6 +6,7 @@ menuconfig TCG_TPM
 	tristate "TPM Hardware Support"
 	depends on HAS_IOMEM
 	select SECURITYFS
+	select CRYPTO_HASH_INFO
 	---help---
 	  If you have a TPM security chip in your system, which
 	  implements the Trusted Computing Group's specification,
diff --git a/drivers/char/tpm/tpm-interface.c b/drivers/char/tpm/tpm-interface.c
index fecdd3f..e037dd2 100644
--- a/drivers/char/tpm/tpm-interface.c
+++ b/drivers/char/tpm/tpm-interface.c
@@ -7,6 +7,7 @@
  * Dave Safford <safford@watson.ibm.com>
  * Reiner Sailer <sailer@watson.ibm.com>
  * Kylene Hall <kjhall@us.ibm.com>
+ * Nayna Jain <nayna@linux.vnet.ibm.com>
  *
  * Maintained by: <tpmdd-devel@lists.sourceforge.net>
  *
@@ -759,6 +760,7 @@ static const struct tpm_input_header pcrextend_header = {
 int tpm_pcr_extend(u32 chip_num, int pcr_idx, const u8 *hash)
 {
 	struct tpm_cmd_t cmd;
+	int i;
 	int rc;
 	struct tpm_chip *chip;
 
@@ -767,7 +769,19 @@ int tpm_pcr_extend(u32 chip_num, int pcr_idx, const u8 *hash)
 		return -ENODEV;
 
 	if (chip->flags & TPM_CHIP_FLAG_TPM2) {
-		rc = tpm2_pcr_extend(chip, pcr_idx, hash);
+		struct tpml_digest_values d_values;
+
+		memset(&d_values, 0, sizeof(d_values));
+
+		for (i = 0; (chip->active_banks[i] != 0) &&
+		     (i < ARRAY_SIZE(chip->active_banks)); i++) {
+			d_values.digests[i].alg_id = chip->active_banks[i];
+			memcpy(d_values.digests[i].digest, hash,
+			       TPM_DIGEST_SIZE);
+			d_values.count++;
+		}
+
+		rc = tpm2_pcr_extend(chip, pcr_idx, &d_values);
 		tpm_put_ops(chip);
 		return rc;
 	}
diff --git a/drivers/char/tpm/tpm.h b/drivers/char/tpm/tpm.h
index dddd573..dd82d58 100644
--- a/drivers/char/tpm/tpm.h
+++ b/drivers/char/tpm/tpm.h
@@ -533,7 +533,8 @@ static inline void tpm_add_ppi(struct tpm_chip *chip)
 #endif
 
 int tpm2_pcr_read(struct tpm_chip *chip, int pcr_idx, u8 *res_buf);
-int tpm2_pcr_extend(struct tpm_chip *chip, int pcr_idx, const u8 *hash);
+int tpm2_pcr_extend(struct tpm_chip *chip, int pcr_idx,
+		    struct tpml_digest_values *digests);
 int tpm2_get_random(struct tpm_chip *chip, u8 *out, size_t max);
 int tpm2_seal_trusted(struct tpm_chip *chip,
 		      struct trusted_key_payload *payload,
diff --git a/drivers/char/tpm/tpm2-cmd.c b/drivers/char/tpm/tpm2-cmd.c
index 87388921..5027a54 100644
--- a/drivers/char/tpm/tpm2-cmd.c
+++ b/drivers/char/tpm/tpm2-cmd.c
@@ -64,9 +64,7 @@ struct tpm2_pcr_extend_in {
 	__be32				pcr_idx;
 	__be32				auth_area_size;
 	struct tpm2_null_auth_area	auth_area;
-	__be32				digest_cnt;
-	__be16				hash_alg;
-	u8				digest[TPM_DIGEST_SIZE];
+	struct tpml_digest_values       digests;
 } __packed;
 
 struct tpm2_get_tpm_pt_in {
@@ -296,46 +294,58 @@ int tpm2_pcr_read(struct tpm_chip *chip, int pcr_idx, u8 *res_buf)
 	return rc;
 }
 
-#define TPM2_GET_PCREXTEND_IN_SIZE \
-	(sizeof(struct tpm_input_header) + \
-	 sizeof(struct tpm2_pcr_extend_in))
-
-static const struct tpm_input_header tpm2_pcrextend_header = {
-	.tag = cpu_to_be16(TPM2_ST_SESSIONS),
-	.length = cpu_to_be32(TPM2_GET_PCREXTEND_IN_SIZE),
-	.ordinal = cpu_to_be32(TPM2_CC_PCR_EXTEND)
-};
-
 /**
  * tpm2_pcr_extend() - extend a PCR value
  *
  * @chip:	TPM chip to use.
  * @pcr_idx:	index of the PCR.
- * @hash:	hash value to use for the extend operation.
+ * @digests:	list of pcr banks and corresponding hash values to be extended.
  *
  * Return: Same as with tpm_transmit_cmd.
  */
-int tpm2_pcr_extend(struct tpm_chip *chip, int pcr_idx, const u8 *hash)
+int tpm2_pcr_extend(struct tpm_chip *chip, int pcr_idx,
+		    struct tpml_digest_values *digests)
 {
-	struct tpm2_cmd cmd;
+	struct tpm_buf buf;
+	struct tpm2_null_auth_area auth_area;
 	int rc;
+	int i;
+	int j;
 
-	cmd.header.in = tpm2_pcrextend_header;
-	cmd.params.pcrextend_in.pcr_idx = cpu_to_be32(pcr_idx);
-	cmd.params.pcrextend_in.auth_area_size =
-		cpu_to_be32(sizeof(struct tpm2_null_auth_area));
-	cmd.params.pcrextend_in.auth_area.handle =
-		cpu_to_be32(TPM2_RS_PW);
-	cmd.params.pcrextend_in.auth_area.nonce_size = 0;
-	cmd.params.pcrextend_in.auth_area.attributes = 0;
-	cmd.params.pcrextend_in.auth_area.auth_size = 0;
-	cmd.params.pcrextend_in.digest_cnt = cpu_to_be32(1);
-	cmd.params.pcrextend_in.hash_alg = cpu_to_be16(TPM2_ALG_SHA1);
-	memcpy(cmd.params.pcrextend_in.digest, hash, TPM_DIGEST_SIZE);
+	rc = tpm_buf_init(&buf, TPM2_ST_SESSIONS, TPM2_CC_PCR_EXTEND);
+	if (rc)
+		return rc;
 
-	rc = tpm_transmit_cmd(chip, &cmd, sizeof(cmd), 0,
+	tpm_buf_append_u32(&buf, pcr_idx);
+
+	auth_area.handle = cpu_to_be32(TPM2_RS_PW);
+	auth_area.nonce_size = 0;
+	auth_area.attributes = 0;
+	auth_area.auth_size = 0;
+
+	tpm_buf_append_u32(&buf, sizeof(struct tpm2_null_auth_area));
+	tpm_buf_append(&buf, (const unsigned char *)&auth_area,
+		       sizeof(auth_area));
+	tpm_buf_append_u32(&buf, digests->count);
+
+	for (i = 0; i < digests->count; i++) {
+		for (j = 0; j < ARRAY_SIZE(tpm2_hash_map); j++) {
+			if (digests->digests[i].alg_id !=
+			    tpm2_hash_map[j].tpm_id)
+				continue;
+
+			tpm_buf_append_u16(&buf, digests->digests[i].alg_id);
+			tpm_buf_append(&buf, (const unsigned char
+					      *)&digests->digests[i].digest,
+				hash_digest_size[tpm2_hash_map[j].crypto_id]);
+		}
+	}
+
+	rc = tpm_transmit_cmd(chip, buf.data, tpm_buf_length(&buf), 0,
 			      "attempting extend a PCR value");
 
+	tpm_buf_destroy(&buf);
+
 	return rc;
 }
 
diff --git a/drivers/char/tpm/tpm_eventlog.h b/drivers/char/tpm/tpm_eventlog.h
index 1660d74..2e47f4d 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)
@@ -73,6 +76,21 @@ enum tcpa_pc_event_ids {
 	HOST_TABLE_OF_DEVICES,
 };
 
+/**
+ * Digest structures for TPM 2.0 as defined in document
+ * Trusted Platform Module Library Part 2: Structures, Family "2.0".
+ */
+
+struct tpmt_ha {
+	u16 alg_id;
+	u8 digest[SHA384_DIGEST_SIZE];
+} __packed;
+
+struct tpml_digest_values {
+	u32 count;
+	struct tpmt_ha digests[TPM2_ACTIVE_PCR_BANKS];
+} __packed;
+
 #if defined(CONFIG_ACPI)
 int tpm_read_log_acpi(struct tpm_chip *chip);
 #else
-- 
2.5.0

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#1557706 — Re: [PATCH v3 2/2] tpm: enhance TPM 2.0 PCR extend to support multiple banks

FromJarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Date2017-01-12 19:30 +0100
SubjectRe: [PATCH v3 2/2] tpm: enhance TPM 2.0 PCR extend to support multiple banks
Message-ID<sYSim-7i7-21@gated-at.bofh.it>
In reply to#1557619
On Thu, Jan 12, 2017 at 11:58:10AM -0500, Nayna Jain wrote:
> The current TPM 2.0 device driver extends only the SHA1 PCR bank
> but the TCG Specification[1] recommends extending all active PCR
> banks, to prevent malicious users from setting unused PCR banks with
> fake measurements and quoting them.
> 
> The existing in-kernel interface(tpm_pcr_extend()) expects only a
> SHA1 digest.  To extend all active PCR banks with differing
> digest sizes, the SHA1 digest is padded with trailing 0's as needed.
> 
> [1] TPM 2.0 Specification referred here is "TCG PC Client Specific
> Platform Firmware Profile for TPM 2.0"
> 
> Signed-off-by: Nayna Jain <nayna@linux.vnet.ibm.com>
> ---
>  drivers/char/tpm/Kconfig         |  1 +
>  drivers/char/tpm/tpm-interface.c | 16 +++++++++-
>  drivers/char/tpm/tpm.h           |  3 +-
>  drivers/char/tpm/tpm2-cmd.c      | 68 +++++++++++++++++++++++-----------------
>  drivers/char/tpm/tpm_eventlog.h  | 18 +++++++++++
>  5 files changed, 75 insertions(+), 31 deletions(-)
> 
> diff --git a/drivers/char/tpm/Kconfig b/drivers/char/tpm/Kconfig
> index 277186d..af985cc 100644
> --- a/drivers/char/tpm/Kconfig
> +++ b/drivers/char/tpm/Kconfig
> @@ -6,6 +6,7 @@ menuconfig TCG_TPM
>  	tristate "TPM Hardware Support"
>  	depends on HAS_IOMEM
>  	select SECURITYFS
> +	select CRYPTO_HASH_INFO

In the commit message you did not mention this.

>  	---help---
>  	  If you have a TPM security chip in your system, which
>  	  implements the Trusted Computing Group's specification,
> diff --git a/drivers/char/tpm/tpm-interface.c b/drivers/char/tpm/tpm-interface.c
> index fecdd3f..e037dd2 100644
> --- a/drivers/char/tpm/tpm-interface.c
> +++ b/drivers/char/tpm/tpm-interface.c
> @@ -7,6 +7,7 @@
>   * Dave Safford <safford@watson.ibm.com>
>   * Reiner Sailer <sailer@watson.ibm.com>
>   * Kylene Hall <kjhall@us.ibm.com>
> + * Nayna Jain <nayna@linux.vnet.ibm.com>

Remove.

>   *
>   * Maintained by: <tpmdd-devel@lists.sourceforge.net>
>   *
> @@ -759,6 +760,7 @@ static const struct tpm_input_header pcrextend_header = {
>  int tpm_pcr_extend(u32 chip_num, int pcr_idx, const u8 *hash)
>  {
>  	struct tpm_cmd_t cmd;
> +	int i;
>  	int rc;
>  	struct tpm_chip *chip;
>  
> @@ -767,7 +769,19 @@ int tpm_pcr_extend(u32 chip_num, int pcr_idx, const u8 *hash)
>  		return -ENODEV;
>  
>  	if (chip->flags & TPM_CHIP_FLAG_TPM2) {
> -		rc = tpm2_pcr_extend(chip, pcr_idx, hash);
> +		struct tpml_digest_values d_values;
> +
> +		memset(&d_values, 0, sizeof(d_values));
> +
> +		for (i = 0; (chip->active_banks[i] != 0) &&
> +		     (i < ARRAY_SIZE(chip->active_banks)); i++) {
> +			d_values.digests[i].alg_id = chip->active_banks[i];
> +			memcpy(d_values.digests[i].digest, hash,
> +			       TPM_DIGEST_SIZE);
> +			d_values.count++;
> +		}
> +
> +		rc = tpm2_pcr_extend(chip, pcr_idx, &d_values);
>  		tpm_put_ops(chip);
>  		return rc;
>  	}
> diff --git a/drivers/char/tpm/tpm.h b/drivers/char/tpm/tpm.h
> index dddd573..dd82d58 100644
> --- a/drivers/char/tpm/tpm.h
> +++ b/drivers/char/tpm/tpm.h
> @@ -533,7 +533,8 @@ static inline void tpm_add_ppi(struct tpm_chip *chip)
>  #endif
>  
>  int tpm2_pcr_read(struct tpm_chip *chip, int pcr_idx, u8 *res_buf);
> -int tpm2_pcr_extend(struct tpm_chip *chip, int pcr_idx, const u8 *hash);
> +int tpm2_pcr_extend(struct tpm_chip *chip, int pcr_idx,
> +		    struct tpml_digest_values *digests);
>  int tpm2_get_random(struct tpm_chip *chip, u8 *out, size_t max);
>  int tpm2_seal_trusted(struct tpm_chip *chip,
>  		      struct trusted_key_payload *payload,
> diff --git a/drivers/char/tpm/tpm2-cmd.c b/drivers/char/tpm/tpm2-cmd.c
> index 87388921..5027a54 100644
> --- a/drivers/char/tpm/tpm2-cmd.c
> +++ b/drivers/char/tpm/tpm2-cmd.c
> @@ -64,9 +64,7 @@ struct tpm2_pcr_extend_in {
>  	__be32				pcr_idx;
>  	__be32				auth_area_size;
>  	struct tpm2_null_auth_area	auth_area;
> -	__be32				digest_cnt;
> -	__be16				hash_alg;
> -	u8				digest[TPM_DIGEST_SIZE];
> +	struct tpml_digest_values       digests;
>  } __packed;
>  
>  struct tpm2_get_tpm_pt_in {
> @@ -296,46 +294,58 @@ int tpm2_pcr_read(struct tpm_chip *chip, int pcr_idx, u8 *res_buf)
>  	return rc;
>  }
>  
> -#define TPM2_GET_PCREXTEND_IN_SIZE \
> -	(sizeof(struct tpm_input_header) + \
> -	 sizeof(struct tpm2_pcr_extend_in))
> -
> -static const struct tpm_input_header tpm2_pcrextend_header = {
> -	.tag = cpu_to_be16(TPM2_ST_SESSIONS),
> -	.length = cpu_to_be32(TPM2_GET_PCREXTEND_IN_SIZE),
> -	.ordinal = cpu_to_be32(TPM2_CC_PCR_EXTEND)
> -};
> -
>  /**
>   * tpm2_pcr_extend() - extend a PCR value
>   *
>   * @chip:	TPM chip to use.
>   * @pcr_idx:	index of the PCR.
> - * @hash:	hash value to use for the extend operation.
> + * @digests:	list of pcr banks and corresponding hash values to be extended.
>   *
>   * Return: Same as with tpm_transmit_cmd.
>   */
> -int tpm2_pcr_extend(struct tpm_chip *chip, int pcr_idx, const u8 *hash)
> +int tpm2_pcr_extend(struct tpm_chip *chip, int pcr_idx,
> +		    struct tpml_digest_values *digests)
>  {
> -	struct tpm2_cmd cmd;
> +	struct tpm_buf buf;
> +	struct tpm2_null_auth_area auth_area;
>  	int rc;
> +	int i;
> +	int j;
>  
> -	cmd.header.in = tpm2_pcrextend_header;
> -	cmd.params.pcrextend_in.pcr_idx = cpu_to_be32(pcr_idx);
> -	cmd.params.pcrextend_in.auth_area_size =
> -		cpu_to_be32(sizeof(struct tpm2_null_auth_area));
> -	cmd.params.pcrextend_in.auth_area.handle =
> -		cpu_to_be32(TPM2_RS_PW);
> -	cmd.params.pcrextend_in.auth_area.nonce_size = 0;
> -	cmd.params.pcrextend_in.auth_area.attributes = 0;
> -	cmd.params.pcrextend_in.auth_area.auth_size = 0;
> -	cmd.params.pcrextend_in.digest_cnt = cpu_to_be32(1);
> -	cmd.params.pcrextend_in.hash_alg = cpu_to_be16(TPM2_ALG_SHA1);
> -	memcpy(cmd.params.pcrextend_in.digest, hash, TPM_DIGEST_SIZE);
> +	rc = tpm_buf_init(&buf, TPM2_ST_SESSIONS, TPM2_CC_PCR_EXTEND);
> +	if (rc)
> +		return rc;
>  
> -	rc = tpm_transmit_cmd(chip, &cmd, sizeof(cmd), 0,
> +	tpm_buf_append_u32(&buf, pcr_idx);
> +
> +	auth_area.handle = cpu_to_be32(TPM2_RS_PW);
> +	auth_area.nonce_size = 0;
> +	auth_area.attributes = 0;
> +	auth_area.auth_size = 0;
> +
> +	tpm_buf_append_u32(&buf, sizeof(struct tpm2_null_auth_area));
> +	tpm_buf_append(&buf, (const unsigned char *)&auth_area,
> +		       sizeof(auth_area));
> +	tpm_buf_append_u32(&buf, digests->count);
> +
> +	for (i = 0; i < digests->count; i++) {
> +		for (j = 0; j < ARRAY_SIZE(tpm2_hash_map); j++) {
> +			if (digests->digests[i].alg_id !=
> +			    tpm2_hash_map[j].tpm_id)
> +				continue;
> +
> +			tpm_buf_append_u16(&buf, digests->digests[i].alg_id);
> +			tpm_buf_append(&buf, (const unsigned char
> +					      *)&digests->digests[i].digest,
> +				hash_digest_size[tpm2_hash_map[j].crypto_id]);
> +		}
> +	}
> +
> +	rc = tpm_transmit_cmd(chip, buf.data, tpm_buf_length(&buf), 0,
>  			      "attempting extend a PCR value");
>  
> +	tpm_buf_destroy(&buf);
> +
>  	return rc;
>  }
>  
> diff --git a/drivers/char/tpm/tpm_eventlog.h b/drivers/char/tpm/tpm_eventlog.h
> index 1660d74..2e47f4d 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)
> @@ -73,6 +76,21 @@ enum tcpa_pc_event_ids {
>  	HOST_TABLE_OF_DEVICES,
>  };
>  
> +/**
> + * Digest structures for TPM 2.0 as defined in document
> + * Trusted Platform Module Library Part 2: Structures, Family "2.0".
> + */

Please remove this comment

> +
> +struct tpmt_ha {
> +	u16 alg_id;
> +	u8 digest[SHA384_DIGEST_SIZE];
> +} __packed;

struct tpm2_hash

> +struct tpml_digest_values {
> +	u32 count;
> +	struct tpmt_ha digests[TPM2_ACTIVE_PCR_BANKS];
> +} __packed;

Please remove this structure.

> +
>  #if defined(CONFIG_ACPI)
>  int tpm_read_log_acpi(struct tpm_chip *chip);
>  #else
> -- 
> 2.5.0
> 

/Jarkko

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#1558119 — Re: [PATCH v3 2/2] tpm: enhance TPM 2.0 PCR extend to support multiple banks

FromNayna <nayna@linux.vnet.ibm.com>
Date2017-01-13 09:50 +0100
SubjectRe: [PATCH v3 2/2] tpm: enhance TPM 2.0 PCR extend to support multiple banks
Message-ID<sZ5IB-75W-7@gated-at.bofh.it>
In reply to#1557706

On 01/12/2017 11:50 PM, Jarkko Sakkinen wrote:
> On Thu, Jan 12, 2017 at 11:58:10AM -0500, Nayna Jain wrote:
>> The current TPM 2.0 device driver extends only the SHA1 PCR bank
>> but the TCG Specification[1] recommends extending all active PCR
>> banks, to prevent malicious users from setting unused PCR banks with
>> fake measurements and quoting them.
>>
>> The existing in-kernel interface(tpm_pcr_extend()) expects only a
>> SHA1 digest.  To extend all active PCR banks with differing
>> digest sizes, the SHA1 digest is padded with trailing 0's as needed.
>>
>> [1] TPM 2.0 Specification referred here is "TCG PC Client Specific
>> Platform Firmware Profile for TPM 2.0"
>>
>> Signed-off-by: Nayna Jain <nayna@linux.vnet.ibm.com>
>> ---
>>   drivers/char/tpm/Kconfig         |  1 +
>>   drivers/char/tpm/tpm-interface.c | 16 +++++++++-
>>   drivers/char/tpm/tpm.h           |  3 +-
>>   drivers/char/tpm/tpm2-cmd.c      | 68 +++++++++++++++++++++++-----------------
>>   drivers/char/tpm/tpm_eventlog.h  | 18 +++++++++++
>>   5 files changed, 75 insertions(+), 31 deletions(-)
>>
>> diff --git a/drivers/char/tpm/Kconfig b/drivers/char/tpm/Kconfig
>> index 277186d..af985cc 100644
>> --- a/drivers/char/tpm/Kconfig
>> +++ b/drivers/char/tpm/Kconfig
>> @@ -6,6 +6,7 @@ menuconfig TCG_TPM
>>   	tristate "TPM Hardware Support"
>>   	depends on HAS_IOMEM
>>   	select SECURITYFS
>> +	select CRYPTO_HASH_INFO
>
> In the commit message you did not mention this.
>
>>   	---help---
>>   	  If you have a TPM security chip in your system, which
>>   	  implements the Trusted Computing Group's specification,
>> diff --git a/drivers/char/tpm/tpm-interface.c b/drivers/char/tpm/tpm-interface.c
>> index fecdd3f..e037dd2 100644
>> --- a/drivers/char/tpm/tpm-interface.c
>> +++ b/drivers/char/tpm/tpm-interface.c
>> @@ -7,6 +7,7 @@
>>    * Dave Safford <safford@watson.ibm.com>
>>    * Reiner Sailer <sailer@watson.ibm.com>
>>    * Kylene Hall <kjhall@us.ibm.com>
>> + * Nayna Jain <nayna@linux.vnet.ibm.com>
>
> Remove.
>
>>    *
>>    * Maintained by: <tpmdd-devel@lists.sourceforge.net>
>>    *
>> @@ -759,6 +760,7 @@ static const struct tpm_input_header pcrextend_header = {
>>   int tpm_pcr_extend(u32 chip_num, int pcr_idx, const u8 *hash)
>>   {
>>   	struct tpm_cmd_t cmd;
>> +	int i;
>>   	int rc;
>>   	struct tpm_chip *chip;
>>
>> @@ -767,7 +769,19 @@ int tpm_pcr_extend(u32 chip_num, int pcr_idx, const u8 *hash)
>>   		return -ENODEV;
>>
>>   	if (chip->flags & TPM_CHIP_FLAG_TPM2) {
>> -		rc = tpm2_pcr_extend(chip, pcr_idx, hash);
>> +		struct tpml_digest_values d_values;
>> +
>> +		memset(&d_values, 0, sizeof(d_values));
>> +
>> +		for (i = 0; (chip->active_banks[i] != 0) &&
>> +		     (i < ARRAY_SIZE(chip->active_banks)); i++) {
>> +			d_values.digests[i].alg_id = chip->active_banks[i];
>> +			memcpy(d_values.digests[i].digest, hash,
>> +			       TPM_DIGEST_SIZE);
>> +			d_values.count++;
>> +		}
>> +
>> +		rc = tpm2_pcr_extend(chip, pcr_idx, &d_values);
>>   		tpm_put_ops(chip);
>>   		return rc;
>>   	}
>> diff --git a/drivers/char/tpm/tpm.h b/drivers/char/tpm/tpm.h
>> index dddd573..dd82d58 100644
>> --- a/drivers/char/tpm/tpm.h
>> +++ b/drivers/char/tpm/tpm.h
>> @@ -533,7 +533,8 @@ static inline void tpm_add_ppi(struct tpm_chip *chip)
>>   #endif
>>
>>   int tpm2_pcr_read(struct tpm_chip *chip, int pcr_idx, u8 *res_buf);
>> -int tpm2_pcr_extend(struct tpm_chip *chip, int pcr_idx, const u8 *hash);
>> +int tpm2_pcr_extend(struct tpm_chip *chip, int pcr_idx,
>> +		    struct tpml_digest_values *digests);
>>   int tpm2_get_random(struct tpm_chip *chip, u8 *out, size_t max);
>>   int tpm2_seal_trusted(struct tpm_chip *chip,
>>   		      struct trusted_key_payload *payload,
>> diff --git a/drivers/char/tpm/tpm2-cmd.c b/drivers/char/tpm/tpm2-cmd.c
>> index 87388921..5027a54 100644
>> --- a/drivers/char/tpm/tpm2-cmd.c
>> +++ b/drivers/char/tpm/tpm2-cmd.c
>> @@ -64,9 +64,7 @@ struct tpm2_pcr_extend_in {
>>   	__be32				pcr_idx;
>>   	__be32				auth_area_size;
>>   	struct tpm2_null_auth_area	auth_area;
>> -	__be32				digest_cnt;
>> -	__be16				hash_alg;
>> -	u8				digest[TPM_DIGEST_SIZE];
>> +	struct tpml_digest_values       digests;
>>   } __packed;
>>
>>   struct tpm2_get_tpm_pt_in {
>> @@ -296,46 +294,58 @@ int tpm2_pcr_read(struct tpm_chip *chip, int pcr_idx, u8 *res_buf)
>>   	return rc;
>>   }
>>
>> -#define TPM2_GET_PCREXTEND_IN_SIZE \
>> -	(sizeof(struct tpm_input_header) + \
>> -	 sizeof(struct tpm2_pcr_extend_in))
>> -
>> -static const struct tpm_input_header tpm2_pcrextend_header = {
>> -	.tag = cpu_to_be16(TPM2_ST_SESSIONS),
>> -	.length = cpu_to_be32(TPM2_GET_PCREXTEND_IN_SIZE),
>> -	.ordinal = cpu_to_be32(TPM2_CC_PCR_EXTEND)
>> -};
>> -
>>   /**
>>    * tpm2_pcr_extend() - extend a PCR value
>>    *
>>    * @chip:	TPM chip to use.
>>    * @pcr_idx:	index of the PCR.
>> - * @hash:	hash value to use for the extend operation.
>> + * @digests:	list of pcr banks and corresponding hash values to be extended.
>>    *
>>    * Return: Same as with tpm_transmit_cmd.
>>    */
>> -int tpm2_pcr_extend(struct tpm_chip *chip, int pcr_idx, const u8 *hash)
>> +int tpm2_pcr_extend(struct tpm_chip *chip, int pcr_idx,
>> +		    struct tpml_digest_values *digests)
>>   {
>> -	struct tpm2_cmd cmd;
>> +	struct tpm_buf buf;
>> +	struct tpm2_null_auth_area auth_area;
>>   	int rc;
>> +	int i;
>> +	int j;
>>
>> -	cmd.header.in = tpm2_pcrextend_header;
>> -	cmd.params.pcrextend_in.pcr_idx = cpu_to_be32(pcr_idx);
>> -	cmd.params.pcrextend_in.auth_area_size =
>> -		cpu_to_be32(sizeof(struct tpm2_null_auth_area));
>> -	cmd.params.pcrextend_in.auth_area.handle =
>> -		cpu_to_be32(TPM2_RS_PW);
>> -	cmd.params.pcrextend_in.auth_area.nonce_size = 0;
>> -	cmd.params.pcrextend_in.auth_area.attributes = 0;
>> -	cmd.params.pcrextend_in.auth_area.auth_size = 0;
>> -	cmd.params.pcrextend_in.digest_cnt = cpu_to_be32(1);
>> -	cmd.params.pcrextend_in.hash_alg = cpu_to_be16(TPM2_ALG_SHA1);
>> -	memcpy(cmd.params.pcrextend_in.digest, hash, TPM_DIGEST_SIZE);
>> +	rc = tpm_buf_init(&buf, TPM2_ST_SESSIONS, TPM2_CC_PCR_EXTEND);
>> +	if (rc)
>> +		return rc;
>>
>> -	rc = tpm_transmit_cmd(chip, &cmd, sizeof(cmd), 0,
>> +	tpm_buf_append_u32(&buf, pcr_idx);
>> +
>> +	auth_area.handle = cpu_to_be32(TPM2_RS_PW);
>> +	auth_area.nonce_size = 0;
>> +	auth_area.attributes = 0;
>> +	auth_area.auth_size = 0;
>> +
>> +	tpm_buf_append_u32(&buf, sizeof(struct tpm2_null_auth_area));
>> +	tpm_buf_append(&buf, (const unsigned char *)&auth_area,
>> +		       sizeof(auth_area));
>> +	tpm_buf_append_u32(&buf, digests->count);
>> +
>> +	for (i = 0; i < digests->count; i++) {
>> +		for (j = 0; j < ARRAY_SIZE(tpm2_hash_map); j++) {
>> +			if (digests->digests[i].alg_id !=
>> +			    tpm2_hash_map[j].tpm_id)
>> +				continue;
>> +
>> +			tpm_buf_append_u16(&buf, digests->digests[i].alg_id);
>> +			tpm_buf_append(&buf, (const unsigned char
>> +					      *)&digests->digests[i].digest,
>> +				hash_digest_size[tpm2_hash_map[j].crypto_id]);
>> +		}
>> +	}
>> +
>> +	rc = tpm_transmit_cmd(chip, buf.data, tpm_buf_length(&buf), 0,
>>   			      "attempting extend a PCR value");
>>
>> +	tpm_buf_destroy(&buf);
>> +
>>   	return rc;
>>   }
>>
>> diff --git a/drivers/char/tpm/tpm_eventlog.h b/drivers/char/tpm/tpm_eventlog.h
>> index 1660d74..2e47f4d 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)
>> @@ -73,6 +76,21 @@ enum tcpa_pc_event_ids {
>>   	HOST_TABLE_OF_DEVICES,
>>   };
>>
>> +/**
>> + * Digest structures for TPM 2.0 as defined in document
>> + * Trusted Platform Module Library Part 2: Structures, Family "2.0".
>> + */
>
> Please remove this comment
>
>> +
>> +struct tpmt_ha {
>> +	u16 alg_id;
>> +	u8 digest[SHA384_DIGEST_SIZE];
>> +} __packed;
>
> struct tpm2_hash
>
>> +struct tpml_digest_values {
>> +	u32 count;
>> +	struct tpmt_ha digests[TPM2_ACTIVE_PCR_BANKS];
>> +} __packed;
>
> Please remove this structure.

Sorry Jarkko, I didn't understand this comment.
Why do we want to remove this structure.

Thanks & Regards,
    - Nayna

>
>> +
>>   #if defined(CONFIG_ACPI)
>>   int tpm_read_log_acpi(struct tpm_chip *chip);
>>   #else
>> --
>> 2.5.0
>>
>
> /Jarkko
>

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#1558572 — Re: [PATCH v3 2/2] tpm: enhance TPM 2.0 PCR extend to support multiple banks

FromJarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Date2017-01-13 17:50 +0100
SubjectRe: [PATCH v3 2/2] tpm: enhance TPM 2.0 PCR extend to support multiple banks
Message-ID<sZdd8-3bn-9@gated-at.bofh.it>
In reply to#1558119
On Fri, Jan 13, 2017 at 12:44:15PM +0530, Nayna wrote:
> 
> 
> On 01/12/2017 11:50 PM, Jarkko Sakkinen wrote:
> > On Thu, Jan 12, 2017 at 11:58:10AM -0500, Nayna Jain wrote:
> > > The current TPM 2.0 device driver extends only the SHA1 PCR bank
> > > but the TCG Specification[1] recommends extending all active PCR
> > > banks, to prevent malicious users from setting unused PCR banks with
> > > fake measurements and quoting them.
> > > 
> > > The existing in-kernel interface(tpm_pcr_extend()) expects only a
> > > SHA1 digest.  To extend all active PCR banks with differing
> > > digest sizes, the SHA1 digest is padded with trailing 0's as needed.
> > > 
> > > [1] TPM 2.0 Specification referred here is "TCG PC Client Specific
> > > Platform Firmware Profile for TPM 2.0"
> > > 
> > > Signed-off-by: Nayna Jain <nayna@linux.vnet.ibm.com>
> > > ---
> > >   drivers/char/tpm/Kconfig         |  1 +
> > >   drivers/char/tpm/tpm-interface.c | 16 +++++++++-
> > >   drivers/char/tpm/tpm.h           |  3 +-
> > >   drivers/char/tpm/tpm2-cmd.c      | 68 +++++++++++++++++++++++-----------------
> > >   drivers/char/tpm/tpm_eventlog.h  | 18 +++++++++++
> > >   5 files changed, 75 insertions(+), 31 deletions(-)
> > > 
> > > diff --git a/drivers/char/tpm/Kconfig b/drivers/char/tpm/Kconfig
> > > index 277186d..af985cc 100644
> > > --- a/drivers/char/tpm/Kconfig
> > > +++ b/drivers/char/tpm/Kconfig
> > > @@ -6,6 +6,7 @@ menuconfig TCG_TPM
> > >   	tristate "TPM Hardware Support"
> > >   	depends on HAS_IOMEM
> > >   	select SECURITYFS
> > > +	select CRYPTO_HASH_INFO
> > 
> > In the commit message you did not mention this.
> > 
> > >   	---help---
> > >   	  If you have a TPM security chip in your system, which
> > >   	  implements the Trusted Computing Group's specification,
> > > diff --git a/drivers/char/tpm/tpm-interface.c b/drivers/char/tpm/tpm-interface.c
> > > index fecdd3f..e037dd2 100644
> > > --- a/drivers/char/tpm/tpm-interface.c
> > > +++ b/drivers/char/tpm/tpm-interface.c
> > > @@ -7,6 +7,7 @@
> > >    * Dave Safford <safford@watson.ibm.com>
> > >    * Reiner Sailer <sailer@watson.ibm.com>
> > >    * Kylene Hall <kjhall@us.ibm.com>
> > > + * Nayna Jain <nayna@linux.vnet.ibm.com>
> > 
> > Remove.
> > 
> > >    *
> > >    * Maintained by: <tpmdd-devel@lists.sourceforge.net>
> > >    *
> > > @@ -759,6 +760,7 @@ static const struct tpm_input_header pcrextend_header = {
> > >   int tpm_pcr_extend(u32 chip_num, int pcr_idx, const u8 *hash)
> > >   {
> > >   	struct tpm_cmd_t cmd;
> > > +	int i;
> > >   	int rc;
> > >   	struct tpm_chip *chip;
> > > 
> > > @@ -767,7 +769,19 @@ int tpm_pcr_extend(u32 chip_num, int pcr_idx, const u8 *hash)
> > >   		return -ENODEV;
> > > 
> > >   	if (chip->flags & TPM_CHIP_FLAG_TPM2) {
> > > -		rc = tpm2_pcr_extend(chip, pcr_idx, hash);
> > > +		struct tpml_digest_values d_values;
> > > +
> > > +		memset(&d_values, 0, sizeof(d_values));
> > > +
> > > +		for (i = 0; (chip->active_banks[i] != 0) &&
> > > +		     (i < ARRAY_SIZE(chip->active_banks)); i++) {
> > > +			d_values.digests[i].alg_id = chip->active_banks[i];
> > > +			memcpy(d_values.digests[i].digest, hash,
> > > +			       TPM_DIGEST_SIZE);
> > > +			d_values.count++;
> > > +		}
> > > +
> > > +		rc = tpm2_pcr_extend(chip, pcr_idx, &d_values);
> > >   		tpm_put_ops(chip);
> > >   		return rc;
> > >   	}
> > > diff --git a/drivers/char/tpm/tpm.h b/drivers/char/tpm/tpm.h
> > > index dddd573..dd82d58 100644
> > > --- a/drivers/char/tpm/tpm.h
> > > +++ b/drivers/char/tpm/tpm.h
> > > @@ -533,7 +533,8 @@ static inline void tpm_add_ppi(struct tpm_chip *chip)
> > >   #endif
> > > 
> > >   int tpm2_pcr_read(struct tpm_chip *chip, int pcr_idx, u8 *res_buf);
> > > -int tpm2_pcr_extend(struct tpm_chip *chip, int pcr_idx, const u8 *hash);
> > > +int tpm2_pcr_extend(struct tpm_chip *chip, int pcr_idx,
> > > +		    struct tpml_digest_values *digests);
> > >   int tpm2_get_random(struct tpm_chip *chip, u8 *out, size_t max);
> > >   int tpm2_seal_trusted(struct tpm_chip *chip,
> > >   		      struct trusted_key_payload *payload,
> > > diff --git a/drivers/char/tpm/tpm2-cmd.c b/drivers/char/tpm/tpm2-cmd.c
> > > index 87388921..5027a54 100644
> > > --- a/drivers/char/tpm/tpm2-cmd.c
> > > +++ b/drivers/char/tpm/tpm2-cmd.c
> > > @@ -64,9 +64,7 @@ struct tpm2_pcr_extend_in {
> > >   	__be32				pcr_idx;
> > >   	__be32				auth_area_size;
> > >   	struct tpm2_null_auth_area	auth_area;
> > > -	__be32				digest_cnt;
> > > -	__be16				hash_alg;
> > > -	u8				digest[TPM_DIGEST_SIZE];
> > > +	struct tpml_digest_values       digests;
> > >   } __packed;
> > > 
> > >   struct tpm2_get_tpm_pt_in {
> > > @@ -296,46 +294,58 @@ int tpm2_pcr_read(struct tpm_chip *chip, int pcr_idx, u8 *res_buf)
> > >   	return rc;
> > >   }
> > > 
> > > -#define TPM2_GET_PCREXTEND_IN_SIZE \
> > > -	(sizeof(struct tpm_input_header) + \
> > > -	 sizeof(struct tpm2_pcr_extend_in))
> > > -
> > > -static const struct tpm_input_header tpm2_pcrextend_header = {
> > > -	.tag = cpu_to_be16(TPM2_ST_SESSIONS),
> > > -	.length = cpu_to_be32(TPM2_GET_PCREXTEND_IN_SIZE),
> > > -	.ordinal = cpu_to_be32(TPM2_CC_PCR_EXTEND)
> > > -};
> > > -
> > >   /**
> > >    * tpm2_pcr_extend() - extend a PCR value
> > >    *
> > >    * @chip:	TPM chip to use.
> > >    * @pcr_idx:	index of the PCR.
> > > - * @hash:	hash value to use for the extend operation.
> > > + * @digests:	list of pcr banks and corresponding hash values to be extended.
> > >    *
> > >    * Return: Same as with tpm_transmit_cmd.
> > >    */
> > > -int tpm2_pcr_extend(struct tpm_chip *chip, int pcr_idx, const u8 *hash)
> > > +int tpm2_pcr_extend(struct tpm_chip *chip, int pcr_idx,
> > > +		    struct tpml_digest_values *digests)
> > >   {
> > > -	struct tpm2_cmd cmd;
> > > +	struct tpm_buf buf;
> > > +	struct tpm2_null_auth_area auth_area;
> > >   	int rc;
> > > +	int i;
> > > +	int j;
> > > 
> > > -	cmd.header.in = tpm2_pcrextend_header;
> > > -	cmd.params.pcrextend_in.pcr_idx = cpu_to_be32(pcr_idx);
> > > -	cmd.params.pcrextend_in.auth_area_size =
> > > -		cpu_to_be32(sizeof(struct tpm2_null_auth_area));
> > > -	cmd.params.pcrextend_in.auth_area.handle =
> > > -		cpu_to_be32(TPM2_RS_PW);
> > > -	cmd.params.pcrextend_in.auth_area.nonce_size = 0;
> > > -	cmd.params.pcrextend_in.auth_area.attributes = 0;
> > > -	cmd.params.pcrextend_in.auth_area.auth_size = 0;
> > > -	cmd.params.pcrextend_in.digest_cnt = cpu_to_be32(1);
> > > -	cmd.params.pcrextend_in.hash_alg = cpu_to_be16(TPM2_ALG_SHA1);
> > > -	memcpy(cmd.params.pcrextend_in.digest, hash, TPM_DIGEST_SIZE);
> > > +	rc = tpm_buf_init(&buf, TPM2_ST_SESSIONS, TPM2_CC_PCR_EXTEND);
> > > +	if (rc)
> > > +		return rc;
> > > 
> > > -	rc = tpm_transmit_cmd(chip, &cmd, sizeof(cmd), 0,
> > > +	tpm_buf_append_u32(&buf, pcr_idx);
> > > +
> > > +	auth_area.handle = cpu_to_be32(TPM2_RS_PW);
> > > +	auth_area.nonce_size = 0;
> > > +	auth_area.attributes = 0;
> > > +	auth_area.auth_size = 0;
> > > +
> > > +	tpm_buf_append_u32(&buf, sizeof(struct tpm2_null_auth_area));
> > > +	tpm_buf_append(&buf, (const unsigned char *)&auth_area,
> > > +		       sizeof(auth_area));
> > > +	tpm_buf_append_u32(&buf, digests->count);
> > > +
> > > +	for (i = 0; i < digests->count; i++) {
> > > +		for (j = 0; j < ARRAY_SIZE(tpm2_hash_map); j++) {
> > > +			if (digests->digests[i].alg_id !=
> > > +			    tpm2_hash_map[j].tpm_id)
> > > +				continue;
> > > +
> > > +			tpm_buf_append_u16(&buf, digests->digests[i].alg_id);
> > > +			tpm_buf_append(&buf, (const unsigned char
> > > +					      *)&digests->digests[i].digest,
> > > +				hash_digest_size[tpm2_hash_map[j].crypto_id]);
> > > +		}
> > > +	}
> > > +
> > > +	rc = tpm_transmit_cmd(chip, buf.data, tpm_buf_length(&buf), 0,
> > >   			      "attempting extend a PCR value");
> > > 
> > > +	tpm_buf_destroy(&buf);
> > > +
> > >   	return rc;
> > >   }
> > > 
> > > diff --git a/drivers/char/tpm/tpm_eventlog.h b/drivers/char/tpm/tpm_eventlog.h
> > > index 1660d74..2e47f4d 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)
> > > @@ -73,6 +76,21 @@ enum tcpa_pc_event_ids {
> > >   	HOST_TABLE_OF_DEVICES,
> > >   };
> > > 
> > > +/**
> > > + * Digest structures for TPM 2.0 as defined in document
> > > + * Trusted Platform Module Library Part 2: Structures, Family "2.0".
> > > + */
> > 
> > Please remove this comment
> > 
> > > +
> > > +struct tpmt_ha {
> > > +	u16 alg_id;
> > > +	u8 digest[SHA384_DIGEST_SIZE];
> > > +} __packed;
> > 
> > struct tpm2_hash
> > 
> > > +struct tpml_digest_values {
> > > +	u32 count;
> > > +	struct tpmt_ha digests[TPM2_ACTIVE_PCR_BANKS];
> > > +} __packed;
> > 
> > Please remove this structure.
> 
> Sorry Jarkko, I didn't understand this comment.
> Why do we want to remove this structure.

Well it is only used to pass two parameters.

> Thanks & Regards,
>    - Nayna

/Jarkko

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