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[PATCH v3 1/2] tpm: implement TPM 2.0 capability to get active PCR banks

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  [PATCH v3 1/2] tpm: implement TPM 2.0 capability to get active PCR banks Nayna Jain <nayna@linux.vnet.ibm.com> - 2017-01-12 18:00 +0100
    Re: [PATCH v3 1/2] tpm: implement TPM 2.0 capability to get active  PCR banks Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com> - 2017-01-12 19:30 +0100
      Re: [PATCH v3 1/2] tpm: implement TPM 2.0 capability to get active  PCR banks Nayna <nayna@linux.vnet.ibm.com> - 2017-01-13 08:40 +0100
        Re: [PATCH v3 1/2] tpm: implement TPM 2.0 capability to get active  PCR banks Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com> - 2017-01-13 17:50 +0100

#1557615 — [PATCH v3 1/2] tpm: implement TPM 2.0 capability to get active PCR banks

This patch implements the TPM 2.0 capability TPM_CAP_PCRS to
retrieve the active PCR banks from the TPM. This is needed
to enable extending all active banks as recommended by TPM 2.0
TCG Specification.

Signed-off-by: Nayna Jain <nayna@linux.vnet.ibm.com>
---
 drivers/char/tpm/tpm.h      |  4 +++
 drivers/char/tpm/tpm2-cmd.c | 59 +++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 63 insertions(+)

diff --git a/drivers/char/tpm/tpm.h b/drivers/char/tpm/tpm.h
index 1ae9768..dddd573 100644
--- a/drivers/char/tpm/tpm.h
+++ b/drivers/char/tpm/tpm.h
@@ -127,6 +127,7 @@ enum tpm2_permanent_handles {
 };
 
 enum tpm2_capabilities {
+	TPM2_CAP_PCRS		= 5,
 	TPM2_CAP_TPM_PROPERTIES = 6,
 };
 
@@ -187,6 +188,8 @@ struct tpm_chip {
 
 	const struct attribute_group *groups[3];
 	unsigned int groups_cnt;
+
+	u16 active_banks[7];
 #ifdef CONFIG_ACPI
 	acpi_handle acpi_dev_handle;
 	char ppi_version[TPM_PPI_VERSION_LEN + 1];
@@ -545,4 +548,5 @@ int tpm2_auto_startup(struct tpm_chip *chip);
 void tpm2_shutdown(struct tpm_chip *chip, u16 shutdown_type);
 unsigned long tpm2_calc_ordinal_duration(struct tpm_chip *chip, u32 ordinal);
 int tpm2_probe(struct tpm_chip *chip);
+ssize_t tpm2_get_pcr_allocation(struct tpm_chip *chip);
 #endif
diff --git a/drivers/char/tpm/tpm2-cmd.c b/drivers/char/tpm/tpm2-cmd.c
index 6eda239..87388921 100644
--- a/drivers/char/tpm/tpm2-cmd.c
+++ b/drivers/char/tpm/tpm2-cmd.c
@@ -83,6 +83,12 @@ struct tpm2_get_tpm_pt_out {
 	__be32	value;
 } __packed;
 
+struct tpm2_tpms_pcr_selection {
+	__be16  hash_alg;
+	u8  size_of_select;
+	u8  pcr_select[3];
+} __packed;
+
 struct tpm2_get_random_in {
 	__be16	size;
 } __packed;
@@ -993,8 +999,61 @@ int tpm2_auto_startup(struct tpm_chip *chip)
 		}
 	}
 
+	rc = tpm2_get_pcr_allocation(chip);
+
 out:
 	if (rc > 0)
 		rc = -ENODEV;
 	return rc;
 }
+
+/**
+ * tpm2_get_pcr_allocation() - get TPM active PCR banks.
+ *
+ * @chip: TPM chip to use.
+ *
+ * Return: Same as with tpm_transmit_cmd.
+ */
+ssize_t tpm2_get_pcr_allocation(struct tpm_chip *chip)
+{
+	struct tpm2_tpms_pcr_selection pcr_selection;
+	struct tpm_buf buf;
+	void *marker;
+	unsigned int count = 0;
+	int rc;
+	int i;
+
+	rc = tpm_buf_init(&buf, TPM2_ST_NO_SESSIONS, TPM2_CC_GET_CAPABILITY);
+	if (rc)
+		return rc;
+
+	tpm_buf_append_u32(&buf, TPM2_CAP_PCRS);
+	tpm_buf_append_u32(&buf, 0);
+	tpm_buf_append_u32(&buf, 1);
+
+	rc = tpm_transmit_cmd(chip, buf.data, PAGE_SIZE, 0,
+			      "get tpm pcr allocation");
+	if (rc < 0)
+		goto out;
+
+	count = be32_to_cpup(
+		(__be32 *) &buf.data[TPM_HEADER_SIZE + 5]);
+
+	if (count > ARRAY_SIZE(chip->active_banks))
+		return -ENODEV;
+
+	marker = &buf.data[TPM_HEADER_SIZE + 9];
+	for (i = 0; i < count; i++) {
+		memcpy(&pcr_selection, marker, sizeof(pcr_selection));
+		chip->active_banks[i] = be16_to_cpu(pcr_selection.hash_alg);
+		marker = marker + sizeof(struct tpm2_tpms_pcr_selection);
+	}
+
+out:
+	if (count < ARRAY_SIZE(chip->active_banks))
+		chip->active_banks[count] = 0;
+
+	tpm_buf_destroy(&buf);
+
+	return rc;
+}
-- 
2.5.0

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#1557705 — Re: [PATCH v3 1/2] tpm: implement TPM 2.0 capability to get active PCR banks

On Thu, Jan 12, 2017 at 11:58:09AM -0500, Nayna Jain wrote:
> This patch implements the TPM 2.0 capability TPM_CAP_PCRS to
> retrieve the active PCR banks from the TPM. This is needed
> to enable extending all active banks as recommended by TPM 2.0
> TCG Specification.
> 
> Signed-off-by: Nayna Jain <nayna@linux.vnet.ibm.com>
> ---
>  drivers/char/tpm/tpm.h      |  4 +++
>  drivers/char/tpm/tpm2-cmd.c | 59 +++++++++++++++++++++++++++++++++++++++++++++
>  2 files changed, 63 insertions(+)
> 
> diff --git a/drivers/char/tpm/tpm.h b/drivers/char/tpm/tpm.h
> index 1ae9768..dddd573 100644
> --- a/drivers/char/tpm/tpm.h
> +++ b/drivers/char/tpm/tpm.h
> @@ -127,6 +127,7 @@ enum tpm2_permanent_handles {
>  };
>  
>  enum tpm2_capabilities {
> +	TPM2_CAP_PCRS		= 5,
>  	TPM2_CAP_TPM_PROPERTIES = 6,
>  };
>  
> @@ -187,6 +188,8 @@ struct tpm_chip {
>  
>  	const struct attribute_group *groups[3];
>  	unsigned int groups_cnt;
> +
> +	u16 active_banks[7];
>  #ifdef CONFIG_ACPI
>  	acpi_handle acpi_dev_handle;
>  	char ppi_version[TPM_PPI_VERSION_LEN + 1];
> @@ -545,4 +548,5 @@ int tpm2_auto_startup(struct tpm_chip *chip);
>  void tpm2_shutdown(struct tpm_chip *chip, u16 shutdown_type);
>  unsigned long tpm2_calc_ordinal_duration(struct tpm_chip *chip, u32 ordinal);
>  int tpm2_probe(struct tpm_chip *chip);
> +ssize_t tpm2_get_pcr_allocation(struct tpm_chip *chip);
>  #endif
> diff --git a/drivers/char/tpm/tpm2-cmd.c b/drivers/char/tpm/tpm2-cmd.c
> index 6eda239..87388921 100644
> --- a/drivers/char/tpm/tpm2-cmd.c
> +++ b/drivers/char/tpm/tpm2-cmd.c
> @@ -83,6 +83,12 @@ struct tpm2_get_tpm_pt_out {
>  	__be32	value;
>  } __packed;
>  
> +struct tpm2_tpms_pcr_selection {
> +	__be16  hash_alg;
> +	u8  size_of_select;
> +	u8  pcr_select[3];
> +} __packed;

Please move this right before tpm2_get_pcr_allocation.
Drop 'tpms_'.

> +
>  struct tpm2_get_random_in {
>  	__be16	size;
>  } __packed;
> @@ -993,8 +999,61 @@ int tpm2_auto_startup(struct tpm_chip *chip)
>  		}
>  	}
>  
> +	rc = tpm2_get_pcr_allocation(chip);
> +

Please have this call in the commit where you actually use it
Does not make any sense here

>  out:
>  	if (rc > 0)
>  		rc = -ENODEV;
>  	return rc;
>  }
> +
> +/**
> + * tpm2_get_pcr_allocation() - get TPM active PCR banks.
> + *
> + * @chip: TPM chip to use.
> + *
> + * Return: Same as with tpm_transmit_cmd.
> + */
> +ssize_t tpm2_get_pcr_allocation(struct tpm_chip *chip)
> +{
> +	struct tpm2_tpms_pcr_selection pcr_selection;
> +	struct tpm_buf buf;
> +	void *marker;
> +	unsigned int count = 0;
> +	int rc;
> +	int i;
> +
> +	rc = tpm_buf_init(&buf, TPM2_ST_NO_SESSIONS, TPM2_CC_GET_CAPABILITY);
> +	if (rc)
> +		return rc;
> +
> +	tpm_buf_append_u32(&buf, TPM2_CAP_PCRS);
> +	tpm_buf_append_u32(&buf, 0);
> +	tpm_buf_append_u32(&buf, 1);
> +
> +	rc = tpm_transmit_cmd(chip, buf.data, PAGE_SIZE, 0,
> +			      "get tpm pcr allocation");
> +	if (rc < 0)
> +		goto out;
> +
> +	count = be32_to_cpup(
> +		(__be32 *) &buf.data[TPM_HEADER_SIZE + 5]);

Please do not add a space after cast. This has been an issue in your
previous patches too so try to do it right next time.

> +
> +	if (count > ARRAY_SIZE(chip->active_banks))
> +		return -ENODEV;
> +
> +	marker = &buf.data[TPM_HEADER_SIZE + 9];
> +	for (i = 0; i < count; i++) {
> +		memcpy(&pcr_selection, marker, sizeof(pcr_selection));
> +		chip->active_banks[i] = be16_to_cpu(pcr_selection.hash_alg);
> +		marker = marker + sizeof(struct tpm2_tpms_pcr_selection);
> +	}
> +
> +out:
> +	if (count < ARRAY_SIZE(chip->active_banks))
> +		chip->active_banks[count] = 0;
> +
> +	tpm_buf_destroy(&buf);
> +
> +	return rc;
> +}
> -- 
> 2.5.0
> 

/Jarkko

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#1558074 — Re: [PATCH v3 1/2] tpm: implement TPM 2.0 capability to get active PCR banks

On 01/12/2017 11:55 PM, Jarkko Sakkinen wrote:
> On Thu, Jan 12, 2017 at 11:58:09AM -0500, Nayna Jain wrote:
>> This patch implements the TPM 2.0 capability TPM_CAP_PCRS to
>> retrieve the active PCR banks from the TPM. This is needed
>> to enable extending all active banks as recommended by TPM 2.0
>> TCG Specification.
>>
>> Signed-off-by: Nayna Jain <nayna@linux.vnet.ibm.com>
>> ---
>>   drivers/char/tpm/tpm.h      |  4 +++
>>   drivers/char/tpm/tpm2-cmd.c | 59 +++++++++++++++++++++++++++++++++++++++++++++
>>   2 files changed, 63 insertions(+)
>>
>> diff --git a/drivers/char/tpm/tpm.h b/drivers/char/tpm/tpm.h
>> index 1ae9768..dddd573 100644
>> --- a/drivers/char/tpm/tpm.h
>> +++ b/drivers/char/tpm/tpm.h
>> @@ -127,6 +127,7 @@ enum tpm2_permanent_handles {
>>   };
>>
>>   enum tpm2_capabilities {
>> +	TPM2_CAP_PCRS		= 5,
>>   	TPM2_CAP_TPM_PROPERTIES = 6,
>>   };
>>
>> @@ -187,6 +188,8 @@ struct tpm_chip {
>>
>>   	const struct attribute_group *groups[3];
>>   	unsigned int groups_cnt;
>> +
>> +	u16 active_banks[7];
>>   #ifdef CONFIG_ACPI
>>   	acpi_handle acpi_dev_handle;
>>   	char ppi_version[TPM_PPI_VERSION_LEN + 1];
>> @@ -545,4 +548,5 @@ int tpm2_auto_startup(struct tpm_chip *chip);
>>   void tpm2_shutdown(struct tpm_chip *chip, u16 shutdown_type);
>>   unsigned long tpm2_calc_ordinal_duration(struct tpm_chip *chip, u32 ordinal);
>>   int tpm2_probe(struct tpm_chip *chip);
>> +ssize_t tpm2_get_pcr_allocation(struct tpm_chip *chip);
>>   #endif
>> diff --git a/drivers/char/tpm/tpm2-cmd.c b/drivers/char/tpm/tpm2-cmd.c
>> index 6eda239..87388921 100644
>> --- a/drivers/char/tpm/tpm2-cmd.c
>> +++ b/drivers/char/tpm/tpm2-cmd.c
>> @@ -83,6 +83,12 @@ struct tpm2_get_tpm_pt_out {
>>   	__be32	value;
>>   } __packed;
>>
>> +struct tpm2_tpms_pcr_selection {
>> +	__be16  hash_alg;
>> +	u8  size_of_select;
>> +	u8  pcr_select[3];
>> +} __packed;
>
> Please move this right before tpm2_get_pcr_allocation.
> Drop 'tpms_'.

Sure, will do this. But didn't understand why. I think all structs are 
defined in start of file..

Thanks & Regards,
    - Nayna

>
>> +
>>   struct tpm2_get_random_in {
>>   	__be16	size;
>>   } __packed;
>> @@ -993,8 +999,61 @@ int tpm2_auto_startup(struct tpm_chip *chip)
>>   		}
>>   	}
>>
>> +	rc = tpm2_get_pcr_allocation(chip);
>> +
>
> Please have this call in the commit where you actually use it
> Does not make any sense here
>
>>   out:
>>   	if (rc > 0)
>>   		rc = -ENODEV;
>>   	return rc;
>>   }
>> +
>> +/**
>> + * tpm2_get_pcr_allocation() - get TPM active PCR banks.
>> + *
>> + * @chip: TPM chip to use.
>> + *
>> + * Return: Same as with tpm_transmit_cmd.
>> + */
>> +ssize_t tpm2_get_pcr_allocation(struct tpm_chip *chip)
>> +{
>> +	struct tpm2_tpms_pcr_selection pcr_selection;
>> +	struct tpm_buf buf;
>> +	void *marker;
>> +	unsigned int count = 0;
>> +	int rc;
>> +	int i;
>> +
>> +	rc = tpm_buf_init(&buf, TPM2_ST_NO_SESSIONS, TPM2_CC_GET_CAPABILITY);
>> +	if (rc)
>> +		return rc;
>> +
>> +	tpm_buf_append_u32(&buf, TPM2_CAP_PCRS);
>> +	tpm_buf_append_u32(&buf, 0);
>> +	tpm_buf_append_u32(&buf, 1);
>> +
>> +	rc = tpm_transmit_cmd(chip, buf.data, PAGE_SIZE, 0,
>> +			      "get tpm pcr allocation");
>> +	if (rc < 0)
>> +		goto out;
>> +
>> +	count = be32_to_cpup(
>> +		(__be32 *) &buf.data[TPM_HEADER_SIZE + 5]);
>
> Please do not add a space after cast. This has been an issue in your
> previous patches too so try to do it right next time.
>
>> +
>> +	if (count > ARRAY_SIZE(chip->active_banks))
>> +		return -ENODEV;
>> +
>> +	marker = &buf.data[TPM_HEADER_SIZE + 9];
>> +	for (i = 0; i < count; i++) {
>> +		memcpy(&pcr_selection, marker, sizeof(pcr_selection));
>> +		chip->active_banks[i] = be16_to_cpu(pcr_selection.hash_alg);
>> +		marker = marker + sizeof(struct tpm2_tpms_pcr_selection);
>> +	}
>> +
>> +out:
>> +	if (count < ARRAY_SIZE(chip->active_banks))
>> +		chip->active_banks[count] = 0;
>> +
>> +	tpm_buf_destroy(&buf);
>> +
>> +	return rc;
>> +}
>> --
>> 2.5.0
>>
>
> /Jarkko
>

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#1558570 — Re: [PATCH v3 1/2] tpm: implement TPM 2.0 capability to get active PCR banks

On Fri, Jan 13, 2017 at 12:54:12PM +0530, Nayna wrote:
> 
> 
> On 01/12/2017 11:55 PM, Jarkko Sakkinen wrote:
> > On Thu, Jan 12, 2017 at 11:58:09AM -0500, Nayna Jain wrote:
> > > This patch implements the TPM 2.0 capability TPM_CAP_PCRS to
> > > retrieve the active PCR banks from the TPM. This is needed
> > > to enable extending all active banks as recommended by TPM 2.0
> > > TCG Specification.
> > > 
> > > Signed-off-by: Nayna Jain <nayna@linux.vnet.ibm.com>
> > > ---
> > >   drivers/char/tpm/tpm.h      |  4 +++
> > >   drivers/char/tpm/tpm2-cmd.c | 59 +++++++++++++++++++++++++++++++++++++++++++++
> > >   2 files changed, 63 insertions(+)
> > > 
> > > diff --git a/drivers/char/tpm/tpm.h b/drivers/char/tpm/tpm.h
> > > index 1ae9768..dddd573 100644
> > > --- a/drivers/char/tpm/tpm.h
> > > +++ b/drivers/char/tpm/tpm.h
> > > @@ -127,6 +127,7 @@ enum tpm2_permanent_handles {
> > >   };
> > > 
> > >   enum tpm2_capabilities {
> > > +	TPM2_CAP_PCRS		= 5,
> > >   	TPM2_CAP_TPM_PROPERTIES = 6,
> > >   };
> > > 
> > > @@ -187,6 +188,8 @@ struct tpm_chip {
> > > 
> > >   	const struct attribute_group *groups[3];
> > >   	unsigned int groups_cnt;
> > > +
> > > +	u16 active_banks[7];
> > >   #ifdef CONFIG_ACPI
> > >   	acpi_handle acpi_dev_handle;
> > >   	char ppi_version[TPM_PPI_VERSION_LEN + 1];
> > > @@ -545,4 +548,5 @@ int tpm2_auto_startup(struct tpm_chip *chip);
> > >   void tpm2_shutdown(struct tpm_chip *chip, u16 shutdown_type);
> > >   unsigned long tpm2_calc_ordinal_duration(struct tpm_chip *chip, u32 ordinal);
> > >   int tpm2_probe(struct tpm_chip *chip);
> > > +ssize_t tpm2_get_pcr_allocation(struct tpm_chip *chip);
> > >   #endif
> > > diff --git a/drivers/char/tpm/tpm2-cmd.c b/drivers/char/tpm/tpm2-cmd.c
> > > index 6eda239..87388921 100644
> > > --- a/drivers/char/tpm/tpm2-cmd.c
> > > +++ b/drivers/char/tpm/tpm2-cmd.c
> > > @@ -83,6 +83,12 @@ struct tpm2_get_tpm_pt_out {
> > >   	__be32	value;
> > >   } __packed;
> > > 
> > > +struct tpm2_tpms_pcr_selection {
> > > +	__be16  hash_alg;
> > > +	u8  size_of_select;
> > > +	u8  pcr_select[3];
> > > +} __packed;
> > 
> > Please move this right before tpm2_get_pcr_allocation.
> > Drop 'tpms_'.
> 
> Sure, will do this. But didn't understand why. I think all structs are
> defined in start of file..
> 
> Thanks & Regards,
>    - Nayna
> 
> > 
> > > +
> > >   struct tpm2_get_random_in {
> > >   	__be16	size;
> > >   } __packed;
> > > @@ -993,8 +999,61 @@ int tpm2_auto_startup(struct tpm_chip *chip)
> > >   		}
> > >   	}
> > > 
> > > +	rc = tpm2_get_pcr_allocation(chip);
> > > +
> > 
> > Please have this call in the commit where you actually use it
> > Does not make any sense here
> > 
> > >   out:
> > >   	if (rc > 0)
> > >   		rc = -ENODEV;
> > >   	return rc;
> > >   }
> > > +
> > > +/**
> > > + * tpm2_get_pcr_allocation() - get TPM active PCR banks.
> > > + *
> > > + * @chip: TPM chip to use.
> > > + *
> > > + * Return: Same as with tpm_transmit_cmd.
> > > + */
> > > +ssize_t tpm2_get_pcr_allocation(struct tpm_chip *chip)
> > > +{
> > > +	struct tpm2_tpms_pcr_selection pcr_selection;
> > > +	struct tpm_buf buf;
> > > +	void *marker;
> > > +	unsigned int count = 0;
> > > +	int rc;
> > > +	int i;
> > > +
> > > +	rc = tpm_buf_init(&buf, TPM2_ST_NO_SESSIONS, TPM2_CC_GET_CAPABILITY);
> > > +	if (rc)
> > > +		return rc;
> > > +
> > > +	tpm_buf_append_u32(&buf, TPM2_CAP_PCRS);
> > > +	tpm_buf_append_u32(&buf, 0);
> > > +	tpm_buf_append_u32(&buf, 1);
> > > +
> > > +	rc = tpm_transmit_cmd(chip, buf.data, PAGE_SIZE, 0,
> > > +			      "get tpm pcr allocation");
> > > +	if (rc < 0)
> > > +		goto out;
> > > +
> > > +	count = be32_to_cpup(
> > > +		(__be32 *) &buf.data[TPM_HEADER_SIZE + 5]);
> > 
> > Please do not add a space after cast. This has been an issue in your
> > previous patches too so try to do it right next time.

It is only used internally by that function. I think this would
make sense for other structures too that are only used by one
function.

/Jarkko

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