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[PATCH] tpm: remove redundant code from self-test functions

Started byJarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
First post2016-03-30 07:40 +0200
Last post2016-03-30 15:10 +0200
Articles 5 — 2 participants

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  [PATCH] tpm: remove redundant code from self-test functions Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com> - 2016-03-30 07:40 +0200
    Re: [PATCH] tpm: remove redundant code from self-test functions kbuild test robot <lkp@intel.com> - 2016-03-30 08:30 +0200
    Re: [PATCH] tpm: remove redundant code from self-test functions Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com> - 2016-03-30 08:40 +0200
    Re: [PATCH] tpm: remove redundant code from self-test functions kbuild test robot <lkp@intel.com> - 2016-03-30 09:00 +0200
    Re: [PATCH] tpm: remove redundant code from self-test functions kbuild test robot <lkp@intel.com> - 2016-03-30 15:10 +0200

#1366900 — [PATCH] tpm: remove redundant code from self-test functions

FromJarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Date2016-03-30 07:40 +0200
Subject[PATCH] tpm: remove redundant code from self-test functions
Message-ID<rih1f-Mt-9@gated-at.bofh.it>
Self-test functions construct PCR read calls by ad hoc, which is only a
waste space. Use instead tpm_pcr_read_dev (renamed as tpm1_pcr_read() by
this commit) in tpm_do_selftest and tpm2_pcr_read() in
tpm2_do_selftest() functions in order to remove the duplicate code.

Patch can be tested easily tested by running the a kernel with this
patch compiled in since self-test is done when the a device driver
initializes.

Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
---
 drivers/char/tpm/tpm-interface.c | 14 +++++---------
 drivers/char/tpm/tpm2-cmd.c      | 14 ++------------
 2 files changed, 7 insertions(+), 21 deletions(-)

diff --git a/drivers/char/tpm/tpm-interface.c b/drivers/char/tpm/tpm-interface.c
index 5397b64..0c8140f 100644
--- a/drivers/char/tpm/tpm-interface.c
+++ b/drivers/char/tpm/tpm-interface.c
@@ -1,6 +1,6 @@
 /*
  * Copyright (C) 2004 IBM Corporation
- * Copyright (C) 2014 Intel Corporation
+ * Copyright (C) 2014, 2016 Intel Corporation
  *
  * Authors:
  * Leendert van Doorn <leendert@watson.ibm.com>
@@ -666,7 +666,7 @@ static struct tpm_input_header pcrread_header = {
 	.ordinal = TPM_ORDINAL_PCRREAD
 };
 
-int tpm_pcr_read_dev(struct tpm_chip *chip, int pcr_idx, u8 *res_buf)
+int tpm1_pcr_read(struct tpm_chip *chip, int pcr_idx, u8 *res_buf)
 {
 	int rc;
 	struct tpm_cmd_t cmd;
@@ -676,7 +676,7 @@ int tpm_pcr_read_dev(struct tpm_chip *chip, int pcr_idx, u8 *res_buf)
 	rc = tpm_transmit_cmd(chip, &cmd, READ_PCR_RESULT_SIZE,
 			      "attempting to read a pcr value");
 
-	if (rc == 0)
+	if (rc == 0 && res_buf)
 		memcpy(res_buf, cmd.params.pcrread_out.pcr_result,
 		       TPM_DIGEST_SIZE);
 	return rc;
@@ -728,7 +728,7 @@ int tpm_pcr_read(u32 chip_num, int pcr_idx, u8 *res_buf)
 	if (chip->flags & TPM_CHIP_FLAG_TPM2)
 		rc = tpm2_pcr_read(chip, pcr_idx, res_buf);
 	else
-		rc = tpm_pcr_read_dev(chip, pcr_idx, res_buf);
+		rc = tpm1_pcr_read(chip, pcr_idx, res_buf);
 	tpm_put_ops(chip);
 	return rc;
 }
@@ -793,7 +793,6 @@ int tpm_do_selftest(struct tpm_chip *chip)
 	unsigned int loops;
 	unsigned int delay_msec = 100;
 	unsigned long duration;
-	struct tpm_cmd_t cmd;
 
 	duration = tpm_calc_ordinal_duration(chip, TPM_ORD_CONTINUE_SELFTEST);
 
@@ -808,9 +807,7 @@ int tpm_do_selftest(struct tpm_chip *chip)
 
 	do {
 		/* Attempt to read a PCR value */
-		cmd.header.in = pcrread_header;
-		cmd.params.pcrread_in.pcr_idx = cpu_to_be32(0);
-		rc = tpm_transmit(chip, (u8 *) &cmd, READ_PCR_RESULT_SIZE);
+		rc = tpm1_pcr_read(chip, 0, NULL);
 		/* Some buggy TPMs will not respond to tpm_tis_ready() for
 		 * around 300ms while the self test is ongoing, keep trying
 		 * until the self test duration expires. */
@@ -825,7 +822,6 @@ int tpm_do_selftest(struct tpm_chip *chip)
 		if (rc < TPM_HEADER_SIZE)
 			return -EFAULT;
 
-		rc = be32_to_cpu(cmd.header.out.return_code);
 		if (rc == TPM_ERR_DISABLED || rc == TPM_ERR_DEACTIVATED) {
 			dev_info(&chip->dev,
 				 "TPM is disabled/deactivated (0x%X)\n", rc);
diff --git a/drivers/char/tpm/tpm2-cmd.c b/drivers/char/tpm/tpm2-cmd.c
index 5fc0e7c..afe8d47 100644
--- a/drivers/char/tpm/tpm2-cmd.c
+++ b/drivers/char/tpm/tpm2-cmd.c
@@ -284,7 +284,7 @@ int tpm2_pcr_read(struct tpm_chip *chip, int pcr_idx, u8 *res_buf)
 
 	rc = tpm_transmit_cmd(chip, &cmd, sizeof(cmd),
 			      "attempting to read a pcr value");
-	if (rc == 0) {
+	if (rc == 0 && res_buf) {
 		buf = cmd.params.pcrread_out.digest;
 		memcpy(res_buf, buf, TPM_DIGEST_SIZE);
 	}
@@ -861,7 +861,6 @@ int tpm2_do_selftest(struct tpm_chip *chip)
 	unsigned int loops;
 	unsigned int delay_msec = 100;
 	unsigned long duration;
-	struct tpm2_cmd cmd;
 	int i;
 
 	duration = tpm2_calc_ordinal_duration(chip, TPM2_CC_SELF_TEST);
@@ -874,19 +873,10 @@ int tpm2_do_selftest(struct tpm_chip *chip)
 
 	for (i = 0; i < loops; i++) {
 		/* Attempt to read a PCR value */
-		cmd.header.in = tpm2_pcrread_header;
-		cmd.params.pcrread_in.pcr_selects_cnt = cpu_to_be32(1);
-		cmd.params.pcrread_in.hash_alg = cpu_to_be16(TPM2_ALG_SHA1);
-		cmd.params.pcrread_in.pcr_select_size = TPM2_PCR_SELECT_MIN;
-		cmd.params.pcrread_in.pcr_select[0] = 0x01;
-		cmd.params.pcrread_in.pcr_select[1] = 0x00;
-		cmd.params.pcrread_in.pcr_select[2] = 0x00;
-
-		rc = tpm_transmit_cmd(chip, (u8 *) &cmd, sizeof(cmd), NULL);
+		rc = tpm2_pcr_read(chip, 0, NULL);
 		if (rc < 0)
 			break;
 
-		rc = be32_to_cpu(cmd.header.out.return_code);
 		if (rc != TPM2_RC_TESTING)
 			break;
 
-- 
2.7.3

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#1366906

Fromkbuild test robot <lkp@intel.com>
Date2016-03-30 08:30 +0200
Message-ID<rihNE-1lh-7@gated-at.bofh.it>
In reply to#1366900

[Multipart message — attachments visible in raw view] — view raw

Hi Jarkko,

[auto build test ERROR on next-20160330]
[cannot apply to v4.6-rc1 v4.5-rc7 v4.5-rc6 v4.6-rc1]
[if your patch is applied to the wrong git tree, please drop us a note to help improving the system]

url:    https://github.com/0day-ci/linux/commits/Jarkko-Sakkinen/tpm-remove-redundant-code-from-self-test-functions/20160330-134151
config: i386-randconfig-n0-201613 (attached as .config)
reproduce:
        # save the attached .config to linux build tree
        make ARCH=i386 

All errors (new ones prefixed by >>):

   drivers/built-in.o: In function `pcrs_show':
>> tpm-sysfs.c:(.text+0xac53a): undefined reference to `tpm_pcr_read_dev'

---
0-DAY kernel test infrastructure                Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all                   Intel Corporation

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#1366912

FromJarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Date2016-03-30 08:40 +0200
Message-ID<rihXk-1pR-19@gated-at.bofh.it>
In reply to#1366900
On Wed, Mar 30, 2016 at 08:37:59AM +0300, Jarkko Sakkinen wrote:
> Self-test functions construct PCR read calls by ad hoc, which is only a
> waste space. Use instead tpm_pcr_read_dev (renamed as tpm1_pcr_read() by
> this commit) in tpm_do_selftest and tpm2_pcr_read() in
> tpm2_do_selftest() functions in order to remove the duplicate code.
> 
> Patch can be tested easily tested by running the a kernel with this
> patch compiled in since self-test is done when the a device driver
> initializes.

Oops, I had a fixup for tpm-sysfs.c that I forgot to squash to the final
patch. Sorry about the compilation error. It can be fixed by changing
the call to tpm1_pcr_read() (parameters are same).

/Jarkko

> Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
> ---
>  drivers/char/tpm/tpm-interface.c | 14 +++++---------
>  drivers/char/tpm/tpm2-cmd.c      | 14 ++------------
>  2 files changed, 7 insertions(+), 21 deletions(-)
> 
> diff --git a/drivers/char/tpm/tpm-interface.c b/drivers/char/tpm/tpm-interface.c
> index 5397b64..0c8140f 100644
> --- a/drivers/char/tpm/tpm-interface.c
> +++ b/drivers/char/tpm/tpm-interface.c
> @@ -1,6 +1,6 @@
>  /*
>   * Copyright (C) 2004 IBM Corporation
> - * Copyright (C) 2014 Intel Corporation
> + * Copyright (C) 2014, 2016 Intel Corporation
>   *
>   * Authors:
>   * Leendert van Doorn <leendert@watson.ibm.com>
> @@ -666,7 +666,7 @@ static struct tpm_input_header pcrread_header = {
>  	.ordinal = TPM_ORDINAL_PCRREAD
>  };
>  
> -int tpm_pcr_read_dev(struct tpm_chip *chip, int pcr_idx, u8 *res_buf)
> +int tpm1_pcr_read(struct tpm_chip *chip, int pcr_idx, u8 *res_buf)
>  {
>  	int rc;
>  	struct tpm_cmd_t cmd;
> @@ -676,7 +676,7 @@ int tpm_pcr_read_dev(struct tpm_chip *chip, int pcr_idx, u8 *res_buf)
>  	rc = tpm_transmit_cmd(chip, &cmd, READ_PCR_RESULT_SIZE,
>  			      "attempting to read a pcr value");
>  
> -	if (rc == 0)
> +	if (rc == 0 && res_buf)
>  		memcpy(res_buf, cmd.params.pcrread_out.pcr_result,
>  		       TPM_DIGEST_SIZE);
>  	return rc;
> @@ -728,7 +728,7 @@ int tpm_pcr_read(u32 chip_num, int pcr_idx, u8 *res_buf)
>  	if (chip->flags & TPM_CHIP_FLAG_TPM2)
>  		rc = tpm2_pcr_read(chip, pcr_idx, res_buf);
>  	else
> -		rc = tpm_pcr_read_dev(chip, pcr_idx, res_buf);
> +		rc = tpm1_pcr_read(chip, pcr_idx, res_buf);
>  	tpm_put_ops(chip);
>  	return rc;
>  }
> @@ -793,7 +793,6 @@ int tpm_do_selftest(struct tpm_chip *chip)
>  	unsigned int loops;
>  	unsigned int delay_msec = 100;
>  	unsigned long duration;
> -	struct tpm_cmd_t cmd;
>  
>  	duration = tpm_calc_ordinal_duration(chip, TPM_ORD_CONTINUE_SELFTEST);
>  
> @@ -808,9 +807,7 @@ int tpm_do_selftest(struct tpm_chip *chip)
>  
>  	do {
>  		/* Attempt to read a PCR value */
> -		cmd.header.in = pcrread_header;
> -		cmd.params.pcrread_in.pcr_idx = cpu_to_be32(0);
> -		rc = tpm_transmit(chip, (u8 *) &cmd, READ_PCR_RESULT_SIZE);
> +		rc = tpm1_pcr_read(chip, 0, NULL);
>  		/* Some buggy TPMs will not respond to tpm_tis_ready() for
>  		 * around 300ms while the self test is ongoing, keep trying
>  		 * until the self test duration expires. */
> @@ -825,7 +822,6 @@ int tpm_do_selftest(struct tpm_chip *chip)
>  		if (rc < TPM_HEADER_SIZE)
>  			return -EFAULT;
>  
> -		rc = be32_to_cpu(cmd.header.out.return_code);
>  		if (rc == TPM_ERR_DISABLED || rc == TPM_ERR_DEACTIVATED) {
>  			dev_info(&chip->dev,
>  				 "TPM is disabled/deactivated (0x%X)\n", rc);
> diff --git a/drivers/char/tpm/tpm2-cmd.c b/drivers/char/tpm/tpm2-cmd.c
> index 5fc0e7c..afe8d47 100644
> --- a/drivers/char/tpm/tpm2-cmd.c
> +++ b/drivers/char/tpm/tpm2-cmd.c
> @@ -284,7 +284,7 @@ int tpm2_pcr_read(struct tpm_chip *chip, int pcr_idx, u8 *res_buf)
>  
>  	rc = tpm_transmit_cmd(chip, &cmd, sizeof(cmd),
>  			      "attempting to read a pcr value");
> -	if (rc == 0) {
> +	if (rc == 0 && res_buf) {
>  		buf = cmd.params.pcrread_out.digest;
>  		memcpy(res_buf, buf, TPM_DIGEST_SIZE);
>  	}
> @@ -861,7 +861,6 @@ int tpm2_do_selftest(struct tpm_chip *chip)
>  	unsigned int loops;
>  	unsigned int delay_msec = 100;
>  	unsigned long duration;
> -	struct tpm2_cmd cmd;
>  	int i;
>  
>  	duration = tpm2_calc_ordinal_duration(chip, TPM2_CC_SELF_TEST);
> @@ -874,19 +873,10 @@ int tpm2_do_selftest(struct tpm_chip *chip)
>  
>  	for (i = 0; i < loops; i++) {
>  		/* Attempt to read a PCR value */
> -		cmd.header.in = tpm2_pcrread_header;
> -		cmd.params.pcrread_in.pcr_selects_cnt = cpu_to_be32(1);
> -		cmd.params.pcrread_in.hash_alg = cpu_to_be16(TPM2_ALG_SHA1);
> -		cmd.params.pcrread_in.pcr_select_size = TPM2_PCR_SELECT_MIN;
> -		cmd.params.pcrread_in.pcr_select[0] = 0x01;
> -		cmd.params.pcrread_in.pcr_select[1] = 0x00;
> -		cmd.params.pcrread_in.pcr_select[2] = 0x00;
> -
> -		rc = tpm_transmit_cmd(chip, (u8 *) &cmd, sizeof(cmd), NULL);
> +		rc = tpm2_pcr_read(chip, 0, NULL);
>  		if (rc < 0)
>  			break;
>  
> -		rc = be32_to_cpu(cmd.header.out.return_code);
>  		if (rc != TPM2_RC_TESTING)
>  			break;
>  
> -- 
> 2.7.3
>

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#1366923

Fromkbuild test robot <lkp@intel.com>
Date2016-03-30 09:00 +0200
Message-ID<riigF-1wq-1@gated-at.bofh.it>
In reply to#1366900

[Multipart message — attachments visible in raw view] — view raw

Hi Jarkko,

[auto build test ERROR on next-20160330]
[cannot apply to v4.6-rc1 v4.5-rc7 v4.5-rc6 v4.6-rc1]
[if your patch is applied to the wrong git tree, please drop us a note to help improving the system]

url:    https://github.com/0day-ci/linux/commits/Jarkko-Sakkinen/tpm-remove-redundant-code-from-self-test-functions/20160330-134151
config: arm-exynos_defconfig (attached as .config)
reproduce:
        wget https://git.kernel.org/cgit/linux/kernel/git/wfg/lkp-tests.git/plain/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # save the attached .config to linux build tree
        make.cross ARCH=arm 

All errors (new ones prefixed by >>):

   drivers/built-in.o: In function `pcrs_show':
>> drivers/char/tpm/tpm-sysfs.c:104: undefined reference to `tpm_pcr_read_dev'

vim +104 drivers/char/tpm/tpm-sysfs.c

000a07b0 Jason Gunthorpe 2013-11-26   98  			"attempting to determine the number of PCRS");
000a07b0 Jason Gunthorpe 2013-11-26   99  	if (rc)
000a07b0 Jason Gunthorpe 2013-11-26  100  		return 0;
000a07b0 Jason Gunthorpe 2013-11-26  101  
000a07b0 Jason Gunthorpe 2013-11-26  102  	num_pcrs = be32_to_cpu(cap.num_pcrs);
000a07b0 Jason Gunthorpe 2013-11-26  103  	for (i = 0; i < num_pcrs; i++) {
000a07b0 Jason Gunthorpe 2013-11-26 @104  		rc = tpm_pcr_read_dev(chip, i, digest);
000a07b0 Jason Gunthorpe 2013-11-26  105  		if (rc)
000a07b0 Jason Gunthorpe 2013-11-26  106  			break;
000a07b0 Jason Gunthorpe 2013-11-26  107  		str += sprintf(str, "PCR-%02d: ", i);

:::::: The code at line 104 was first introduced by commit
:::::: 000a07b0aac1bc69bcf602b468d975c3e37a155c tpm: Move sysfs functions from tpm-interface to tpm-sysfs

:::::: TO: Jason Gunthorpe <jgunthorpe@obsidianresearch.com>
:::::: CC: Peter Huewe <peterhuewe@gmx.de>

---
0-DAY kernel test infrastructure                Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all                   Intel Corporation

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#1367193

Fromkbuild test robot <lkp@intel.com>
Date2016-03-30 15:10 +0200
Message-ID<rio2K-5RV-5@gated-at.bofh.it>
In reply to#1366900

[Multipart message — attachments visible in raw view] — view raw

Hi Jarkko,

[auto build test ERROR on next-20160330]
[cannot apply to v4.6-rc1 v4.5-rc7 v4.5-rc6 v4.6-rc1]
[if your patch is applied to the wrong git tree, please drop us a note to help improving the system]

url:    https://github.com/0day-ci/linux/commits/Jarkko-Sakkinen/tpm-remove-redundant-code-from-self-test-functions/20160330-134151
config: x86_64-randconfig-n0-03301912 (attached as .config)
reproduce:
        # save the attached .config to linux build tree
        make ARCH=x86_64 

All errors (new ones prefixed by >>):

>> ERROR: "tpm_pcr_read_dev" [drivers/char/tpm/tpm.ko] undefined!

---
0-DAY kernel test infrastructure                Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all                   Intel Corporation

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