[tpmdd-devel] tpm: fix type issues in tpm_getcap()
diff mbox

Message ID 20170201175347.2035-1-jarkko.sakkinen@linux.intel.com
State New
Headers show

Commit Message

Jarkko Sakkinen Feb. 1, 2017, 5:53 p.m. UTC
There are two type issues associated with tpm_getcap().

You must not do arithmetic with __be32 or __le32 types because sometimes
it results incorrect results. Calculations must be done only with data
that is in CPU byte order. This commit migrates tpm_getcap() to struct
tpm_buf in order to sort out these issues.

The second issue is with struct cap_t as the size of the type bool is
assumed to be one byte. This commit sorts out the issue by changing the
type to u8.

Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
---
v2:
- Use struct tpm_buf.
- Merge the type change of 'owned' to this patch.
 drivers/char/tpm/tpm-interface.c | 33 ++++++++++++++++++---------------
 drivers/char/tpm/tpm.h           | 15 +--------------
 2 files changed, 19 insertions(+), 29 deletions(-)

Comments

Jarkko Sakkinen Feb. 1, 2017, 6:18 p.m. UTC | #1
On Wed, Feb 01, 2017 at 07:53:47PM +0200, Jarkko Sakkinen wrote:
> There are two type issues associated with tpm_getcap().
> 
> You must not do arithmetic with __be32 or __le32 types because sometimes
> it results incorrect results. Calculations must be done only with data
> that is in CPU byte order. This commit migrates tpm_getcap() to struct
> tpm_buf in order to sort out these issues.
> 
> The second issue is with struct cap_t as the size of the type bool is
> assumed to be one byte. This commit sorts out the issue by changing the
> type to u8.
> 
> Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>

This is the only mandatory fix for the next pull request and 4.11.

/Jarkko

> ---
> v2:
> - Use struct tpm_buf.
> - Merge the type change of 'owned' to this patch.
>  drivers/char/tpm/tpm-interface.c | 33 ++++++++++++++++++---------------
>  drivers/char/tpm/tpm.h           | 15 +--------------
>  2 files changed, 19 insertions(+), 29 deletions(-)
> 
> diff --git a/drivers/char/tpm/tpm-interface.c b/drivers/char/tpm/tpm-interface.c
> index 423938e..7af1e8c 100644
> --- a/drivers/char/tpm/tpm-interface.c
> +++ b/drivers/char/tpm/tpm-interface.c
> @@ -480,31 +480,34 @@ static const struct tpm_input_header tpm_getcap_header = {
>  ssize_t tpm_getcap(struct tpm_chip *chip, u32 subcap_id, cap_t *cap,
>  		   const char *desc, size_t min_cap_length)
>  {
> -	struct tpm_cmd_t tpm_cmd;
> +	struct tpm_buf buf;
>  	int rc;
>  
> -	tpm_cmd.header.in = tpm_getcap_header;
> +	rc = tpm_buf_init(&buf, TPM_TAG_RQU_COMMAND, TPM_ORD_GET_CAP);
> +	if (rc)
> +		return rc;
> +
>  	if (subcap_id == TPM_CAP_VERSION_1_1 ||
>  	    subcap_id == TPM_CAP_VERSION_1_2) {
> -		tpm_cmd.params.getcap_in.cap = cpu_to_be32(subcap_id);
> -		/*subcap field not necessary */
> -		tpm_cmd.params.getcap_in.subcap_size = cpu_to_be32(0);
> -		tpm_cmd.header.in.length -= cpu_to_be32(sizeof(__be32));
> +		tpm_buf_append_u32(&buf, subcap_id);
> +		tpm_buf_append_u32(&buf, 0);
>  	} else {
>  		if (subcap_id == TPM_CAP_FLAG_PERM ||
>  		    subcap_id == TPM_CAP_FLAG_VOL)
> -			tpm_cmd.params.getcap_in.cap =
> -				cpu_to_be32(TPM_CAP_FLAG);
> +			tpm_buf_append_u32(&buf, TPM_CAP_FLAG);
>  		else
> -			tpm_cmd.params.getcap_in.cap =
> -				cpu_to_be32(TPM_CAP_PROP);
> -		tpm_cmd.params.getcap_in.subcap_size = cpu_to_be32(4);
> -		tpm_cmd.params.getcap_in.subcap = cpu_to_be32(subcap_id);
> +			tpm_buf_append_u32(&buf, TPM_CAP_PROP);
> +
> +		tpm_buf_append_u32(&buf, 4);
> +		tpm_buf_append_u32(&buf, subcap_id);
>  	}
> -	rc = tpm_transmit_cmd(chip, &tpm_cmd, TPM_INTERNAL_RESULT_SIZE,
> -			      min_cap_length, 0, desc);
> +
> +	rc = tpm_transmit_cmd(chip, buf.data, PAGE_SIZE, min_cap_length, 0,
> +			      desc);
>  	if (!rc)
> -		*cap = tpm_cmd.params.getcap_out.cap;
> +		*cap = *(cap_t *)&buf.data[TPM_HEADER_SIZE + 4];
> +
> +	tpm_buf_destroy(&buf);
>  	return rc;
>  }
>  EXPORT_SYMBOL_GPL(tpm_getcap);
> diff --git a/drivers/char/tpm/tpm.h b/drivers/char/tpm/tpm.h
> index bff37be..709e7d4 100644
> --- a/drivers/char/tpm/tpm.h
> +++ b/drivers/char/tpm/tpm.h
> @@ -281,7 +281,7 @@ struct permanent_flags_t {
>  typedef union {
>  	struct	permanent_flags_t perm_flags;
>  	struct	stclear_flags_t	stclear_flags;
> -	bool	owned;
> +	u8	owned;
>  	__be32	num_pcrs;
>  	struct	tpm_version_t	tpm_version;
>  	struct	tpm_version_1_2_t tpm_version_1_2;
> @@ -307,17 +307,6 @@ enum tpm_sub_capabilities {
>  	TPM_CAP_PROP_TIS_DURATION = 0x120,
>  };
>  
> -struct	tpm_getcap_params_in {
> -	__be32	cap;
> -	__be32	subcap_size;
> -	__be32	subcap;
> -} __packed;
> -
> -struct	tpm_getcap_params_out {
> -	__be32	cap_size;
> -	cap_t	cap;
> -} __packed;
> -
>  struct	tpm_readpubek_params_out {
>  	u8	algorithm[4];
>  	u8	encscheme[2];
> @@ -367,10 +356,8 @@ struct tpm_startup_in {
>  } __packed;
>  
>  typedef union {
> -	struct	tpm_getcap_params_out getcap_out;
>  	struct	tpm_readpubek_params_out readpubek_out;
>  	u8	readpubek_out_buffer[sizeof(struct tpm_readpubek_params_out)];
> -	struct	tpm_getcap_params_in getcap_in;
>  	struct	tpm_pcrread_in	pcrread_in;
>  	struct	tpm_pcrread_out	pcrread_out;
>  	struct	tpm_pcrextend_in pcrextend_in;
> -- 
> 2.9.3
> 

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Jarkko Sakkinen Feb. 1, 2017, 6:30 p.m. UTC | #2
On Wed, Feb 01, 2017 at 08:18:45PM +0200, Jarkko Sakkinen wrote:
> On Wed, Feb 01, 2017 at 07:53:47PM +0200, Jarkko Sakkinen wrote:
> > There are two type issues associated with tpm_getcap().
> > 
> > You must not do arithmetic with __be32 or __le32 types because sometimes
> > it results incorrect results. Calculations must be done only with data
> > that is in CPU byte order. This commit migrates tpm_getcap() to struct
> > tpm_buf in order to sort out these issues.
> > 
> > The second issue is with struct cap_t as the size of the type bool is
> > assumed to be one byte. This commit sorts out the issue by changing the
> > type to u8.
> > 
> > Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
> 
> This is the only mandatory fix for the next pull request and 4.11.

I mean from the reported sparse errors.

/Jarkko

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Jarkko Sakkinen Feb. 1, 2017, 6:40 p.m. UTC | #3
On Wed, Feb 01, 2017 at 07:53:47PM +0200, Jarkko Sakkinen wrote:
> There are two type issues associated with tpm_getcap().
> 
> You must not do arithmetic with __be32 or __le32 types because sometimes
> it results incorrect results. Calculations must be done only with data
> that is in CPU byte order. This commit migrates tpm_getcap() to struct
> tpm_buf in order to sort out these issues.
> 
> The second issue is with struct cap_t as the size of the type bool is
> assumed to be one byte. This commit sorts out the issue by changing the
> type to u8.
> 
> Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
> ---
> v2:
> - Use struct tpm_buf.
> - Merge the type change of 'owned' to this patch.
>  drivers/char/tpm/tpm-interface.c | 33 ++++++++++++++++++---------------
>  drivers/char/tpm/tpm.h           | 15 +--------------
>  2 files changed, 19 insertions(+), 29 deletions(-)
> 
> diff --git a/drivers/char/tpm/tpm-interface.c b/drivers/char/tpm/tpm-interface.c
> index 423938e..7af1e8c 100644
> --- a/drivers/char/tpm/tpm-interface.c
> +++ b/drivers/char/tpm/tpm-interface.c
> @@ -480,31 +480,34 @@ static const struct tpm_input_header tpm_getcap_header = {
>  ssize_t tpm_getcap(struct tpm_chip *chip, u32 subcap_id, cap_t *cap,
>  		   const char *desc, size_t min_cap_length)

Last two parameters are in the wrong order (different than
tpm_transmit_cmd).

/Jarkko

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Jarkko Sakkinen Feb. 2, 2017, 1:50 p.m. UTC | #4
On Wed, Feb 01, 2017 at 07:53:47PM +0200, Jarkko Sakkinen wrote:
> There are two type issues associated with tpm_getcap().
> 
> You must not do arithmetic with __be32 or __le32 types because sometimes
> it results incorrect results. Calculations must be done only with data
> that is in CPU byte order. This commit migrates tpm_getcap() to struct
> tpm_buf in order to sort out these issues.
> 
> The second issue is with struct cap_t as the size of the type bool is
> assumed to be one byte. This commit sorts out the issue by changing the
> type to u8.
> 
> Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>

Wwould it be possible for anyone to peer test this so I could
move forward creating the pull request? 

/Jarkko

> ---
> v2:
> - Use struct tpm_buf.
> - Merge the type change of 'owned' to this patch.
>  drivers/char/tpm/tpm-interface.c | 33 ++++++++++++++++++---------------
>  drivers/char/tpm/tpm.h           | 15 +--------------
>  2 files changed, 19 insertions(+), 29 deletions(-)
> 
> diff --git a/drivers/char/tpm/tpm-interface.c b/drivers/char/tpm/tpm-interface.c
> index 423938e..7af1e8c 100644
> --- a/drivers/char/tpm/tpm-interface.c
> +++ b/drivers/char/tpm/tpm-interface.c
> @@ -480,31 +480,34 @@ static const struct tpm_input_header tpm_getcap_header = {
>  ssize_t tpm_getcap(struct tpm_chip *chip, u32 subcap_id, cap_t *cap,
>  		   const char *desc, size_t min_cap_length)
>  {
> -	struct tpm_cmd_t tpm_cmd;
> +	struct tpm_buf buf;
>  	int rc;
>  
> -	tpm_cmd.header.in = tpm_getcap_header;
> +	rc = tpm_buf_init(&buf, TPM_TAG_RQU_COMMAND, TPM_ORD_GET_CAP);
> +	if (rc)
> +		return rc;
> +
>  	if (subcap_id == TPM_CAP_VERSION_1_1 ||
>  	    subcap_id == TPM_CAP_VERSION_1_2) {
> -		tpm_cmd.params.getcap_in.cap = cpu_to_be32(subcap_id);
> -		/*subcap field not necessary */
> -		tpm_cmd.params.getcap_in.subcap_size = cpu_to_be32(0);
> -		tpm_cmd.header.in.length -= cpu_to_be32(sizeof(__be32));
> +		tpm_buf_append_u32(&buf, subcap_id);
> +		tpm_buf_append_u32(&buf, 0);
>  	} else {
>  		if (subcap_id == TPM_CAP_FLAG_PERM ||
>  		    subcap_id == TPM_CAP_FLAG_VOL)
> -			tpm_cmd.params.getcap_in.cap =
> -				cpu_to_be32(TPM_CAP_FLAG);
> +			tpm_buf_append_u32(&buf, TPM_CAP_FLAG);
>  		else
> -			tpm_cmd.params.getcap_in.cap =
> -				cpu_to_be32(TPM_CAP_PROP);
> -		tpm_cmd.params.getcap_in.subcap_size = cpu_to_be32(4);
> -		tpm_cmd.params.getcap_in.subcap = cpu_to_be32(subcap_id);
> +			tpm_buf_append_u32(&buf, TPM_CAP_PROP);
> +
> +		tpm_buf_append_u32(&buf, 4);
> +		tpm_buf_append_u32(&buf, subcap_id);
>  	}
> -	rc = tpm_transmit_cmd(chip, &tpm_cmd, TPM_INTERNAL_RESULT_SIZE,
> -			      min_cap_length, 0, desc);
> +
> +	rc = tpm_transmit_cmd(chip, buf.data, PAGE_SIZE, min_cap_length, 0,
> +			      desc);
>  	if (!rc)
> -		*cap = tpm_cmd.params.getcap_out.cap;
> +		*cap = *(cap_t *)&buf.data[TPM_HEADER_SIZE + 4];
> +
> +	tpm_buf_destroy(&buf);
>  	return rc;
>  }
>  EXPORT_SYMBOL_GPL(tpm_getcap);
> diff --git a/drivers/char/tpm/tpm.h b/drivers/char/tpm/tpm.h
> index bff37be..709e7d4 100644
> --- a/drivers/char/tpm/tpm.h
> +++ b/drivers/char/tpm/tpm.h
> @@ -281,7 +281,7 @@ struct permanent_flags_t {
>  typedef union {
>  	struct	permanent_flags_t perm_flags;
>  	struct	stclear_flags_t	stclear_flags;
> -	bool	owned;
> +	u8	owned;
>  	__be32	num_pcrs;
>  	struct	tpm_version_t	tpm_version;
>  	struct	tpm_version_1_2_t tpm_version_1_2;
> @@ -307,17 +307,6 @@ enum tpm_sub_capabilities {
>  	TPM_CAP_PROP_TIS_DURATION = 0x120,
>  };
>  
> -struct	tpm_getcap_params_in {
> -	__be32	cap;
> -	__be32	subcap_size;
> -	__be32	subcap;
> -} __packed;
> -
> -struct	tpm_getcap_params_out {
> -	__be32	cap_size;
> -	cap_t	cap;
> -} __packed;
> -
>  struct	tpm_readpubek_params_out {
>  	u8	algorithm[4];
>  	u8	encscheme[2];
> @@ -367,10 +356,8 @@ struct tpm_startup_in {
>  } __packed;
>  
>  typedef union {
> -	struct	tpm_getcap_params_out getcap_out;
>  	struct	tpm_readpubek_params_out readpubek_out;
>  	u8	readpubek_out_buffer[sizeof(struct tpm_readpubek_params_out)];
> -	struct	tpm_getcap_params_in getcap_in;
>  	struct	tpm_pcrread_in	pcrread_in;
>  	struct	tpm_pcrread_out	pcrread_out;
>  	struct	tpm_pcrextend_in pcrextend_in;
> -- 
> 2.9.3
> 

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Nayna Jain Feb. 3, 2017, 12:54 p.m. UTC | #5
On 02/01/2017 11:23 PM, Jarkko Sakkinen wrote:
> There are two type issues associated with tpm_getcap().
>
> You must not do arithmetic with __be32 or __le32 types because sometimes
> it results incorrect results. Calculations must be done only with data
> that is in CPU byte order. This commit migrates tpm_getcap() to struct
> tpm_buf in order to sort out these issues.
>
> The second issue is with struct cap_t as the size of the type bool is
> assumed to be one byte. This commit sorts out the issue by changing the
> type to u8.
>
> Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
> ---
> v2:
> - Use struct tpm_buf.
> - Merge the type change of 'owned' to this patch.
>   drivers/char/tpm/tpm-interface.c | 33 ++++++++++++++++++---------------
>   drivers/char/tpm/tpm.h           | 15 +--------------
>   2 files changed, 19 insertions(+), 29 deletions(-)
>
> diff --git a/drivers/char/tpm/tpm-interface.c b/drivers/char/tpm/tpm-interface.c
> index 423938e..7af1e8c 100644
> --- a/drivers/char/tpm/tpm-interface.c
> +++ b/drivers/char/tpm/tpm-interface.c
> @@ -480,31 +480,34 @@ static const struct tpm_input_header tpm_getcap_header = {

Is tpm_getcap_header still needed ?

Thanks & Regards,
    - Nayna

>   ssize_t tpm_getcap(struct tpm_chip *chip, u32 subcap_id, cap_t *cap,
>   		   const char *desc, size_t min_cap_length)
>   {
> -	struct tpm_cmd_t tpm_cmd;
> +	struct tpm_buf buf;
>   	int rc;
>
> -	tpm_cmd.header.in = tpm_getcap_header;
> +	rc = tpm_buf_init(&buf, TPM_TAG_RQU_COMMAND, TPM_ORD_GET_CAP);
> +	if (rc)
> +		return rc;
> +
>   	if (subcap_id == TPM_CAP_VERSION_1_1 ||
>   	    subcap_id == TPM_CAP_VERSION_1_2) {
> -		tpm_cmd.params.getcap_in.cap = cpu_to_be32(subcap_id);
> -		/*subcap field not necessary */
> -		tpm_cmd.params.getcap_in.subcap_size = cpu_to_be32(0);
> -		tpm_cmd.header.in.length -= cpu_to_be32(sizeof(__be32));
> +		tpm_buf_append_u32(&buf, subcap_id);
> +		tpm_buf_append_u32(&buf, 0);
>   	} else {
>   		if (subcap_id == TPM_CAP_FLAG_PERM ||
>   		    subcap_id == TPM_CAP_FLAG_VOL)
> -			tpm_cmd.params.getcap_in.cap =
> -				cpu_to_be32(TPM_CAP_FLAG);
> +			tpm_buf_append_u32(&buf, TPM_CAP_FLAG);
>   		else
> -			tpm_cmd.params.getcap_in.cap =
> -				cpu_to_be32(TPM_CAP_PROP);
> -		tpm_cmd.params.getcap_in.subcap_size = cpu_to_be32(4);
> -		tpm_cmd.params.getcap_in.subcap = cpu_to_be32(subcap_id);
> +			tpm_buf_append_u32(&buf, TPM_CAP_PROP);
> +
> +		tpm_buf_append_u32(&buf, 4);
> +		tpm_buf_append_u32(&buf, subcap_id);
>   	}
> -	rc = tpm_transmit_cmd(chip, &tpm_cmd, TPM_INTERNAL_RESULT_SIZE,
> -			      min_cap_length, 0, desc);
> +
> +	rc = tpm_transmit_cmd(chip, buf.data, PAGE_SIZE, min_cap_length, 0,
> +			      desc);
>   	if (!rc)
> -		*cap = tpm_cmd.params.getcap_out.cap;
> +		*cap = *(cap_t *)&buf.data[TPM_HEADER_SIZE + 4];
> +
> +	tpm_buf_destroy(&buf);
>   	return rc;
>   }
>   EXPORT_SYMBOL_GPL(tpm_getcap);
> diff --git a/drivers/char/tpm/tpm.h b/drivers/char/tpm/tpm.h
> index bff37be..709e7d4 100644
> --- a/drivers/char/tpm/tpm.h
> +++ b/drivers/char/tpm/tpm.h
> @@ -281,7 +281,7 @@ struct permanent_flags_t {
>   typedef union {
>   	struct	permanent_flags_t perm_flags;
>   	struct	stclear_flags_t	stclear_flags;
> -	bool	owned;
> +	u8	owned;
>   	__be32	num_pcrs;
>   	struct	tpm_version_t	tpm_version;
>   	struct	tpm_version_1_2_t tpm_version_1_2;
> @@ -307,17 +307,6 @@ enum tpm_sub_capabilities {
>   	TPM_CAP_PROP_TIS_DURATION = 0x120,
>   };
>
> -struct	tpm_getcap_params_in {
> -	__be32	cap;
> -	__be32	subcap_size;
> -	__be32	subcap;
> -} __packed;
> -
> -struct	tpm_getcap_params_out {
> -	__be32	cap_size;
> -	cap_t	cap;
> -} __packed;
> -
>   struct	tpm_readpubek_params_out {
>   	u8	algorithm[4];
>   	u8	encscheme[2];
> @@ -367,10 +356,8 @@ struct tpm_startup_in {
>   } __packed;
>
>   typedef union {
> -	struct	tpm_getcap_params_out getcap_out;
>   	struct	tpm_readpubek_params_out readpubek_out;
>   	u8	readpubek_out_buffer[sizeof(struct tpm_readpubek_params_out)];
> -	struct	tpm_getcap_params_in getcap_in;
>   	struct	tpm_pcrread_in	pcrread_in;
>   	struct	tpm_pcrread_out	pcrread_out;
>   	struct	tpm_pcrextend_in pcrextend_in;
>


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Nayna Jain Feb. 3, 2017, 1:48 p.m. UTC | #6
On 02/01/2017 11:23 PM, Jarkko Sakkinen wrote:
> There are two type issues associated with tpm_getcap().
>
> You must not do arithmetic with __be32 or __le32 types because sometimes
> it results incorrect results. Calculations must be done only with data
> that is in CPU byte order. This commit migrates tpm_getcap() to struct
> tpm_buf in order to sort out these issues.
>
> The second issue is with struct cap_t as the size of the type bool is
> assumed to be one byte. This commit sorts out the issue by changing the
> type to u8.
>
> Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
> ---
> v2:
> - Use struct tpm_buf.
> - Merge the type change of 'owned' to this patch.
>   drivers/char/tpm/tpm-interface.c | 33 ++++++++++++++++++---------------
>   drivers/char/tpm/tpm.h           | 15 +--------------
>   2 files changed, 19 insertions(+), 29 deletions(-)
>
> diff --git a/drivers/char/tpm/tpm-interface.c b/drivers/char/tpm/tpm-interface.c
> index 423938e..7af1e8c 100644
> --- a/drivers/char/tpm/tpm-interface.c
> +++ b/drivers/char/tpm/tpm-interface.c
> @@ -480,31 +480,34 @@ static const struct tpm_input_header tpm_getcap_header = {
>   ssize_t tpm_getcap(struct tpm_chip *chip, u32 subcap_id, cap_t *cap,
>   		   const char *desc, size_t min_cap_length)
>   {
> -	struct tpm_cmd_t tpm_cmd;
> +	struct tpm_buf buf;
>   	int rc;
>
> -	tpm_cmd.header.in = tpm_getcap_header;
> +	rc = tpm_buf_init(&buf, TPM_TAG_RQU_COMMAND, TPM_ORD_GET_CAP);

I think there is a problem here of twice converting to be32 for both tag 
and ordinal.

Both TPM_ORD_GET_CAP and TPM_TAG_RQU_COMMAND are already defined as:
#define TPM_ORD_GET_CAP cpu_to_be32(101)
#define TPM_TAG_RQU_COMMAND  cpu_to_be16(193)

and again converted to BE in tpm_buf_init().

Thanks & Regards,
    - Nayna

> +	if (rc)
> +		return rc;
> +
>   	if (subcap_id == TPM_CAP_VERSION_1_1 ||
>   	    subcap_id == TPM_CAP_VERSION_1_2) {
> -		tpm_cmd.params.getcap_in.cap = cpu_to_be32(subcap_id);
> -		/*subcap field not necessary */
> -		tpm_cmd.params.getcap_in.subcap_size = cpu_to_be32(0);
> -		tpm_cmd.header.in.length -= cpu_to_be32(sizeof(__be32));
> +		tpm_buf_append_u32(&buf, subcap_id);
> +		tpm_buf_append_u32(&buf, 0);
>   	} else {
>   		if (subcap_id == TPM_CAP_FLAG_PERM ||
>   		    subcap_id == TPM_CAP_FLAG_VOL)
> -			tpm_cmd.params.getcap_in.cap =
> -				cpu_to_be32(TPM_CAP_FLAG);
> +			tpm_buf_append_u32(&buf, TPM_CAP_FLAG);
>   		else
> -			tpm_cmd.params.getcap_in.cap =
> -				cpu_to_be32(TPM_CAP_PROP);
> -		tpm_cmd.params.getcap_in.subcap_size = cpu_to_be32(4);
> -		tpm_cmd.params.getcap_in.subcap = cpu_to_be32(subcap_id);
> +			tpm_buf_append_u32(&buf, TPM_CAP_PROP);
> +
> +		tpm_buf_append_u32(&buf, 4);
> +		tpm_buf_append_u32(&buf, subcap_id);
>   	}
> -	rc = tpm_transmit_cmd(chip, &tpm_cmd, TPM_INTERNAL_RESULT_SIZE,
> -			      min_cap_length, 0, desc);
> +
> +	rc = tpm_transmit_cmd(chip, buf.data, PAGE_SIZE, min_cap_length, 0,
> +			      desc);
>   	if (!rc)
> -		*cap = tpm_cmd.params.getcap_out.cap;
> +		*cap = *(cap_t *)&buf.data[TPM_HEADER_SIZE + 4];
> +
> +	tpm_buf_destroy(&buf);
>   	return rc;
>   }
>   EXPORT_SYMBOL_GPL(tpm_getcap);
> diff --git a/drivers/char/tpm/tpm.h b/drivers/char/tpm/tpm.h
> index bff37be..709e7d4 100644
> --- a/drivers/char/tpm/tpm.h
> +++ b/drivers/char/tpm/tpm.h
> @@ -281,7 +281,7 @@ struct permanent_flags_t {
>   typedef union {
>   	struct	permanent_flags_t perm_flags;
>   	struct	stclear_flags_t	stclear_flags;
> -	bool	owned;
> +	u8	owned;
>   	__be32	num_pcrs;
>   	struct	tpm_version_t	tpm_version;
>   	struct	tpm_version_1_2_t tpm_version_1_2;
> @@ -307,17 +307,6 @@ enum tpm_sub_capabilities {
>   	TPM_CAP_PROP_TIS_DURATION = 0x120,
>   };
>
> -struct	tpm_getcap_params_in {
> -	__be32	cap;
> -	__be32	subcap_size;
> -	__be32	subcap;
> -} __packed;
> -
> -struct	tpm_getcap_params_out {
> -	__be32	cap_size;
> -	cap_t	cap;
> -} __packed;
> -
>   struct	tpm_readpubek_params_out {
>   	u8	algorithm[4];
>   	u8	encscheme[2];
> @@ -367,10 +356,8 @@ struct tpm_startup_in {
>   } __packed;
>
>   typedef union {
> -	struct	tpm_getcap_params_out getcap_out;
>   	struct	tpm_readpubek_params_out readpubek_out;
>   	u8	readpubek_out_buffer[sizeof(struct tpm_readpubek_params_out)];
> -	struct	tpm_getcap_params_in getcap_in;
>   	struct	tpm_pcrread_in	pcrread_in;
>   	struct	tpm_pcrread_out	pcrread_out;
>   	struct	tpm_pcrextend_in pcrextend_in;
>


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Jarkko Sakkinen Feb. 3, 2017, 6:15 p.m. UTC | #7
On Fri, Feb 03, 2017 at 06:24:38PM +0530, Nayna wrote:
> 
> 
> On 02/01/2017 11:23 PM, Jarkko Sakkinen wrote:
> > There are two type issues associated with tpm_getcap().
> > 
> > You must not do arithmetic with __be32 or __le32 types because sometimes
> > it results incorrect results. Calculations must be done only with data
> > that is in CPU byte order. This commit migrates tpm_getcap() to struct
> > tpm_buf in order to sort out these issues.
> > 
> > The second issue is with struct cap_t as the size of the type bool is
> > assumed to be one byte. This commit sorts out the issue by changing the
> > type to u8.
> > 
> > Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
> > ---
> > v2:
> > - Use struct tpm_buf.
> > - Merge the type change of 'owned' to this patch.
> >   drivers/char/tpm/tpm-interface.c | 33 ++++++++++++++++++---------------
> >   drivers/char/tpm/tpm.h           | 15 +--------------
> >   2 files changed, 19 insertions(+), 29 deletions(-)
> > 
> > diff --git a/drivers/char/tpm/tpm-interface.c b/drivers/char/tpm/tpm-interface.c
> > index 423938e..7af1e8c 100644
> > --- a/drivers/char/tpm/tpm-interface.c
> > +++ b/drivers/char/tpm/tpm-interface.c
> > @@ -480,31 +480,34 @@ static const struct tpm_input_header tpm_getcap_header = {
> 
> Is tpm_getcap_header still needed ?

Definitely not, thanks. Are you able to try this out so I could
move forward with pull request?

/Jarkko

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Nayna Jain Feb. 3, 2017, 6:46 p.m. UTC | #8
On 02/03/2017 11:45 PM, Jarkko Sakkinen wrote:
> On Fri, Feb 03, 2017 at 06:24:38PM +0530, Nayna wrote:
>>
>>
>> On 02/01/2017 11:23 PM, Jarkko Sakkinen wrote:
>>> There are two type issues associated with tpm_getcap().
>>>
>>> You must not do arithmetic with __be32 or __le32 types because sometimes
>>> it results incorrect results. Calculations must be done only with data
>>> that is in CPU byte order. This commit migrates tpm_getcap() to struct
>>> tpm_buf in order to sort out these issues.
>>>
>>> The second issue is with struct cap_t as the size of the type bool is
>>> assumed to be one byte. This commit sorts out the issue by changing the
>>> type to u8.
>>>
>>> Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
>>> ---
>>> v2:
>>> - Use struct tpm_buf.
>>> - Merge the type change of 'owned' to this patch.
>>>    drivers/char/tpm/tpm-interface.c | 33 ++++++++++++++++++---------------
>>>    drivers/char/tpm/tpm.h           | 15 +--------------
>>>    2 files changed, 19 insertions(+), 29 deletions(-)
>>>
>>> diff --git a/drivers/char/tpm/tpm-interface.c b/drivers/char/tpm/tpm-interface.c
>>> index 423938e..7af1e8c 100644
>>> --- a/drivers/char/tpm/tpm-interface.c
>>> +++ b/drivers/char/tpm/tpm-interface.c
>>> @@ -480,31 +480,34 @@ static const struct tpm_input_header tpm_getcap_header = {
>>
>> Is tpm_getcap_header still needed ?
>
> Definitely not, thanks. Are you able to try this out so I could
> move forward with pull request?

Yes, I tried it out and see a problem, I already replied that in one 
other mail.
The tag and ordinal are converted to BE twice, once in #define  and 
again in tpm_buf_init.

Thanks & Regards,
    - Nayna


>
> /Jarkko
>


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Jarkko Sakkinen Feb. 3, 2017, 7:06 p.m. UTC | #9
On Sat, Feb 04, 2017 at 12:16:31AM +0530, Nayna wrote:
> 
> 
> On 02/03/2017 11:45 PM, Jarkko Sakkinen wrote:
> > On Fri, Feb 03, 2017 at 06:24:38PM +0530, Nayna wrote:
> > > 
> > > 
> > > On 02/01/2017 11:23 PM, Jarkko Sakkinen wrote:
> > > > There are two type issues associated with tpm_getcap().
> > > > 
> > > > You must not do arithmetic with __be32 or __le32 types because sometimes
> > > > it results incorrect results. Calculations must be done only with data
> > > > that is in CPU byte order. This commit migrates tpm_getcap() to struct
> > > > tpm_buf in order to sort out these issues.
> > > > 
> > > > The second issue is with struct cap_t as the size of the type bool is
> > > > assumed to be one byte. This commit sorts out the issue by changing the
> > > > type to u8.
> > > > 
> > > > Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
> > > > ---
> > > > v2:
> > > > - Use struct tpm_buf.
> > > > - Merge the type change of 'owned' to this patch.
> > > >    drivers/char/tpm/tpm-interface.c | 33 ++++++++++++++++++---------------
> > > >    drivers/char/tpm/tpm.h           | 15 +--------------
> > > >    2 files changed, 19 insertions(+), 29 deletions(-)
> > > > 
> > > > diff --git a/drivers/char/tpm/tpm-interface.c b/drivers/char/tpm/tpm-interface.c
> > > > index 423938e..7af1e8c 100644
> > > > --- a/drivers/char/tpm/tpm-interface.c
> > > > +++ b/drivers/char/tpm/tpm-interface.c
> > > > @@ -480,31 +480,34 @@ static const struct tpm_input_header tpm_getcap_header = {
> > > 
> > > Is tpm_getcap_header still needed ?
> > 
> > Definitely not, thanks. Are you able to try this out so I could
> > move forward with pull request?
> 
> Yes, I tried it out and see a problem, I already replied that in one other
> mail.
> The tag and ordinal are converted to BE twice, once in #define  and again in
> tpm_buf_init.
> 
> Thanks & Regards,
>    - Nayna

Hmm... I wonder why it seemed to work when I tried it. I must have done
BuildRoot image build without this patch [1]. Hmm... I just take Stefans
patch that only changes 'owned' to u8 and refine this after the pull
request. Fixing the other sparse errors is not as high priority for the
release.

[1] http://git.infradead.org/users/jjs/buildroot-tpmdd.git

/Jarkko

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Patch
diff mbox

diff --git a/drivers/char/tpm/tpm-interface.c b/drivers/char/tpm/tpm-interface.c
index 423938e..7af1e8c 100644
--- a/drivers/char/tpm/tpm-interface.c
+++ b/drivers/char/tpm/tpm-interface.c
@@ -480,31 +480,34 @@  static const struct tpm_input_header tpm_getcap_header = {
 ssize_t tpm_getcap(struct tpm_chip *chip, u32 subcap_id, cap_t *cap,
 		   const char *desc, size_t min_cap_length)
 {
-	struct tpm_cmd_t tpm_cmd;
+	struct tpm_buf buf;
 	int rc;
 
-	tpm_cmd.header.in = tpm_getcap_header;
+	rc = tpm_buf_init(&buf, TPM_TAG_RQU_COMMAND, TPM_ORD_GET_CAP);
+	if (rc)
+		return rc;
+
 	if (subcap_id == TPM_CAP_VERSION_1_1 ||
 	    subcap_id == TPM_CAP_VERSION_1_2) {
-		tpm_cmd.params.getcap_in.cap = cpu_to_be32(subcap_id);
-		/*subcap field not necessary */
-		tpm_cmd.params.getcap_in.subcap_size = cpu_to_be32(0);
-		tpm_cmd.header.in.length -= cpu_to_be32(sizeof(__be32));
+		tpm_buf_append_u32(&buf, subcap_id);
+		tpm_buf_append_u32(&buf, 0);
 	} else {
 		if (subcap_id == TPM_CAP_FLAG_PERM ||
 		    subcap_id == TPM_CAP_FLAG_VOL)
-			tpm_cmd.params.getcap_in.cap =
-				cpu_to_be32(TPM_CAP_FLAG);
+			tpm_buf_append_u32(&buf, TPM_CAP_FLAG);
 		else
-			tpm_cmd.params.getcap_in.cap =
-				cpu_to_be32(TPM_CAP_PROP);
-		tpm_cmd.params.getcap_in.subcap_size = cpu_to_be32(4);
-		tpm_cmd.params.getcap_in.subcap = cpu_to_be32(subcap_id);
+			tpm_buf_append_u32(&buf, TPM_CAP_PROP);
+
+		tpm_buf_append_u32(&buf, 4);
+		tpm_buf_append_u32(&buf, subcap_id);
 	}
-	rc = tpm_transmit_cmd(chip, &tpm_cmd, TPM_INTERNAL_RESULT_SIZE,
-			      min_cap_length, 0, desc);
+
+	rc = tpm_transmit_cmd(chip, buf.data, PAGE_SIZE, min_cap_length, 0,
+			      desc);
 	if (!rc)
-		*cap = tpm_cmd.params.getcap_out.cap;
+		*cap = *(cap_t *)&buf.data[TPM_HEADER_SIZE + 4];
+
+	tpm_buf_destroy(&buf);
 	return rc;
 }
 EXPORT_SYMBOL_GPL(tpm_getcap);
diff --git a/drivers/char/tpm/tpm.h b/drivers/char/tpm/tpm.h
index bff37be..709e7d4 100644
--- a/drivers/char/tpm/tpm.h
+++ b/drivers/char/tpm/tpm.h
@@ -281,7 +281,7 @@  struct permanent_flags_t {
 typedef union {
 	struct	permanent_flags_t perm_flags;
 	struct	stclear_flags_t	stclear_flags;
-	bool	owned;
+	u8	owned;
 	__be32	num_pcrs;
 	struct	tpm_version_t	tpm_version;
 	struct	tpm_version_1_2_t tpm_version_1_2;
@@ -307,17 +307,6 @@  enum tpm_sub_capabilities {
 	TPM_CAP_PROP_TIS_DURATION = 0x120,
 };
 
-struct	tpm_getcap_params_in {
-	__be32	cap;
-	__be32	subcap_size;
-	__be32	subcap;
-} __packed;
-
-struct	tpm_getcap_params_out {
-	__be32	cap_size;
-	cap_t	cap;
-} __packed;
-
 struct	tpm_readpubek_params_out {
 	u8	algorithm[4];
 	u8	encscheme[2];
@@ -367,10 +356,8 @@  struct tpm_startup_in {
 } __packed;
 
 typedef union {
-	struct	tpm_getcap_params_out getcap_out;
 	struct	tpm_readpubek_params_out readpubek_out;
 	u8	readpubek_out_buffer[sizeof(struct tpm_readpubek_params_out)];
-	struct	tpm_getcap_params_in getcap_in;
 	struct	tpm_pcrread_in	pcrread_in;
 	struct	tpm_pcrread_out	pcrread_out;
 	struct	tpm_pcrextend_in pcrextend_in;