[v7,09/21] tpm: factor out tpm1_get_random into tpm1-cmd.c
diff mbox series

Message ID 20181019182307.17745-10-tomas.winkler@intel.com
State Accepted
Commit 433d390f005d3a89dba5a03a87b5a6c242748de3
Headers show
Series
  • tpm: separate tpm 1.x and tpm 2.x commands
Related show

Commit Message

Tomas Winkler Oct. 19, 2018, 6:22 p.m. UTC
Factor out get random implementation from tpm-interface.c
into tpm1_get_random function in tpm1-cmd.c.
No functional changes.

Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Reviewed-by: Jarkko Sakkine <jarkko.sakkinen@linux.intel.com>
---
V2-V3: Rebase
V4-V7: Resend

 drivers/char/tpm/tpm-interface.c | 58 +++++-----------------------------------
 drivers/char/tpm/tpm.h           |  1 +
 drivers/char/tpm/tpm1-cmd.c      | 55 +++++++++++++++++++++++++++++++++++++
 3 files changed, 63 insertions(+), 51 deletions(-)

Comments

Jarkko Sakkinen Oct. 20, 2018, 12:58 a.m. UTC | #1
On Fri, 19 Oct 2018, Tomas Winkler wrote:
> Factor out get random implementation from tpm-interface.c
> into tpm1_get_random function in tpm1-cmd.c.
> No functional changes.
>
> Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
> Reviewed-by: Jarkko Sakkine <jarkko.sakkinen@linux.intel.com>

*If* there is need for a new version can you change that to:

Reviewed-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>

Otherwise, I can fix it.

/Jarkko
Jarkko Sakkinen Oct. 23, 2018, 6:42 p.m. UTC | #2
On Fri, 19 Oct 2018, Tomas Winkler wrote:
> Factor out get random implementation from tpm-interface.c
> into tpm1_get_random function in tpm1-cmd.c.
> No functional changes.
>
> Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
> Reviewed-by: Jarkko Sakkine <jarkko.sakkinen@linux.intel.com>
> Reviewed-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
> ---
> V2-V3: Rebase
> V4-V7: Resend
>
> drivers/char/tpm/tpm-interface.c | 58 +++++-----------------------------------
> drivers/char/tpm/tpm.h           |  1 +
> drivers/char/tpm/tpm1-cmd.c      | 55 +++++++++++++++++++++++++++++++++++++
> 3 files changed, 63 insertions(+), 51 deletions(-)
>
> diff --git a/drivers/char/tpm/tpm-interface.c b/drivers/char/tpm/tpm-interface.c
> index 486e211b03a0..a72bf6ea8f05 100644
> --- a/drivers/char/tpm/tpm-interface.c
> +++ b/drivers/char/tpm/tpm-interface.c
> @@ -812,14 +812,6 @@ int tpm_pm_resume(struct device *dev)
> }
> EXPORT_SYMBOL_GPL(tpm_pm_resume);
>
> -#define TPM_ORD_GET_RANDOM 70
> -#define TPM_GETRANDOM_RESULT_SIZE	18
> -static const struct tpm_input_header tpm_getrandom_header = {
> -	.tag = cpu_to_be16(TPM_TAG_RQU_COMMAND),
> -	.length = cpu_to_be32(14),
> -	.ordinal = cpu_to_be32(TPM_ORD_GET_RANDOM)
> -};
> -
> /**
>  * tpm_get_random() - get random bytes from the TPM's RNG
>  * @chip:	a &struct tpm_chip instance, %NULL for the default chip
> @@ -830,58 +822,22 @@ static const struct tpm_input_header tpm_getrandom_header = {
>  */
> int tpm_get_random(struct tpm_chip *chip, u8 *out, size_t max)
> {
> -	struct tpm_cmd_t tpm_cmd;
> -	u32 recd, num_bytes = min_t(u32, max, TPM_MAX_RNG_DATA), rlength;
> -	int err, total = 0, retries = 5;
> -	u8 *dest = out;
> +	int rc;
>
> -	if (!out || !num_bytes || max > TPM_MAX_RNG_DATA)
> +	if (!out || max > TPM_MAX_RNG_DATA)
> 		return -EINVAL;
>
> 	chip = tpm_find_get_ops(chip);
> 	if (!chip)
> 		return -ENODEV;
>
> -	if (chip->flags & TPM_CHIP_FLAG_TPM2) {
> -		err = tpm2_get_random(chip, out, max);
> -		tpm_put_ops(chip);
> -		return err;
> -	}
> -
> -	do {
> -		tpm_cmd.header.in = tpm_getrandom_header;
> -		tpm_cmd.params.getrandom_in.num_bytes = cpu_to_be32(num_bytes);
> -
> -		err = tpm_transmit_cmd(chip, NULL, &tpm_cmd,
> -				       TPM_GETRANDOM_RESULT_SIZE + num_bytes,
> -				       offsetof(struct tpm_getrandom_out,
> -						rng_data),
> -				       0, "attempting get random");
> -		if (err)
> -			break;
> -
> -		recd = be32_to_cpu(tpm_cmd.params.getrandom_out.rng_data_len);
> -		if (recd > num_bytes) {
> -			total = -EFAULT;
> -			break;
> -		}
> -
> -		rlength = be32_to_cpu(tpm_cmd.header.out.length);
> -		if (rlength < TPM_HEADER_SIZE +
> -			      offsetof(struct tpm_getrandom_out, rng_data) +
> -			      recd) {
> -			total = -EFAULT;
> -			break;
> -		}
> -		memcpy(dest, tpm_cmd.params.getrandom_out.rng_data, recd);
> -
> -		dest += recd;
> -		total += recd;
> -		num_bytes -= recd;
> -	} while (retries-- && total < max);
> +	if (chip->flags & TPM_CHIP_FLAG_TPM2)
> +		rc = tpm2_get_random(chip, out, max);
> +	else
> +		rc = tpm1_get_random(chip, out, max);
>
> 	tpm_put_ops(chip);
> -	return total ? total : -EIO;
> +	return rc;
> }
> EXPORT_SYMBOL_GPL(tpm_get_random);
>
> diff --git a/drivers/char/tpm/tpm.h b/drivers/char/tpm/tpm.h
> index 05c386b3ab12..22f89f41ad52 100644
> --- a/drivers/char/tpm/tpm.h
> +++ b/drivers/char/tpm/tpm.h
> @@ -551,6 +551,7 @@ int tpm1_pcr_extend(struct tpm_chip *chip, int pcr_idx, const u8 *hash,
> 		    const char *log_msg);
> ssize_t tpm1_getcap(struct tpm_chip *chip, u32 subcap_id, cap_t *cap,
> 		    const char *desc, size_t min_cap_length);
> +int tpm1_get_random(struct tpm_chip *chip, u8 *out, size_t max);
> unsigned long tpm_calc_ordinal_duration(struct tpm_chip *chip, u32 ordinal);
> int tpm_pm_suspend(struct device *dev);
> int tpm_pm_resume(struct device *dev);
> diff --git a/drivers/char/tpm/tpm1-cmd.c b/drivers/char/tpm/tpm1-cmd.c
> index 3bd079587ef5..e02f0c1c822f 100644
> --- a/drivers/char/tpm/tpm1-cmd.c
> +++ b/drivers/char/tpm/tpm1-cmd.c
> @@ -469,3 +469,58 @@ ssize_t tpm1_getcap(struct tpm_chip *chip, u32 subcap_id, cap_t *cap,
> 	return rc;
> }
> EXPORT_SYMBOL_GPL(tpm1_getcap);
> +
> +#define TPM_ORD_GET_RANDOM 70
> +#define TPM_GETRANDOM_RESULT_SIZE	18
> +static const struct tpm_input_header tpm_getrandom_header = {
> +	.tag = cpu_to_be16(TPM_TAG_RQU_COMMAND),
> +	.length = cpu_to_be32(14),
> +	.ordinal = cpu_to_be32(TPM_ORD_GET_RANDOM)
> +};
> +
> +int tpm1_get_random(struct tpm_chip *chip, u8 *out, size_t max)
> +{
> +	struct tpm_cmd_t tpm_cmd;
> +	u32 recd;
> +	u32 num_bytes = min_t(u32, max, TPM_MAX_RNG_DATA);
> +	u32 rlength;
> +	int err, total = 0, retries = 5;
> +	u8 *dest = out;
> +
> +	if (!out || !num_bytes || max > TPM_MAX_RNG_DATA)
> +		return -EINVAL;
> +
> +	do {
> +		tpm_cmd.header.in = tpm_getrandom_header;
> +		tpm_cmd.params.getrandom_in.num_bytes = cpu_to_be32(num_bytes);
> +
> +		err = tpm_transmit_cmd(chip, NULL, &tpm_cmd,
> +				       TPM_GETRANDOM_RESULT_SIZE + num_bytes,
> +				       offsetof(struct tpm_getrandom_out,
> +						rng_data),
> +				       0, "attempting get random");
> +		if (err)
> +			break;
> +
> +		recd = be32_to_cpu(tpm_cmd.params.getrandom_out.rng_data_len);
> +		if (recd > num_bytes) {
> +			total = -EFAULT;
> +			break;
> +		}
> +
> +		rlength = be32_to_cpu(tpm_cmd.header.out.length);
> +		if (rlength < TPM_HEADER_SIZE +
> +			      offsetof(struct tpm_getrandom_out, rng_data) +
> +			      recd) {
> +			total = -EFAULT;
> +			break;
> +		}
> +		memcpy(dest, tpm_cmd.params.getrandom_out.rng_data, recd);
> +
> +		dest += recd;
> +		total += recd;
> +		num_bytes -= recd;
> +	} while (retries-- && (size_t)total < max);
> +
> +	return total ? total : -EIO;
> +}
>

Tested-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>

/Jarkko

Patch
diff mbox series

diff --git a/drivers/char/tpm/tpm-interface.c b/drivers/char/tpm/tpm-interface.c
index 486e211b03a0..a72bf6ea8f05 100644
--- a/drivers/char/tpm/tpm-interface.c
+++ b/drivers/char/tpm/tpm-interface.c
@@ -812,14 +812,6 @@  int tpm_pm_resume(struct device *dev)
 }
 EXPORT_SYMBOL_GPL(tpm_pm_resume);
 
-#define TPM_ORD_GET_RANDOM 70
-#define TPM_GETRANDOM_RESULT_SIZE	18
-static const struct tpm_input_header tpm_getrandom_header = {
-	.tag = cpu_to_be16(TPM_TAG_RQU_COMMAND),
-	.length = cpu_to_be32(14),
-	.ordinal = cpu_to_be32(TPM_ORD_GET_RANDOM)
-};
-
 /**
  * tpm_get_random() - get random bytes from the TPM's RNG
  * @chip:	a &struct tpm_chip instance, %NULL for the default chip
@@ -830,58 +822,22 @@  static const struct tpm_input_header tpm_getrandom_header = {
  */
 int tpm_get_random(struct tpm_chip *chip, u8 *out, size_t max)
 {
-	struct tpm_cmd_t tpm_cmd;
-	u32 recd, num_bytes = min_t(u32, max, TPM_MAX_RNG_DATA), rlength;
-	int err, total = 0, retries = 5;
-	u8 *dest = out;
+	int rc;
 
-	if (!out || !num_bytes || max > TPM_MAX_RNG_DATA)
+	if (!out || max > TPM_MAX_RNG_DATA)
 		return -EINVAL;
 
 	chip = tpm_find_get_ops(chip);
 	if (!chip)
 		return -ENODEV;
 
-	if (chip->flags & TPM_CHIP_FLAG_TPM2) {
-		err = tpm2_get_random(chip, out, max);
-		tpm_put_ops(chip);
-		return err;
-	}
-
-	do {
-		tpm_cmd.header.in = tpm_getrandom_header;
-		tpm_cmd.params.getrandom_in.num_bytes = cpu_to_be32(num_bytes);
-
-		err = tpm_transmit_cmd(chip, NULL, &tpm_cmd,
-				       TPM_GETRANDOM_RESULT_SIZE + num_bytes,
-				       offsetof(struct tpm_getrandom_out,
-						rng_data),
-				       0, "attempting get random");
-		if (err)
-			break;
-
-		recd = be32_to_cpu(tpm_cmd.params.getrandom_out.rng_data_len);
-		if (recd > num_bytes) {
-			total = -EFAULT;
-			break;
-		}
-
-		rlength = be32_to_cpu(tpm_cmd.header.out.length);
-		if (rlength < TPM_HEADER_SIZE +
-			      offsetof(struct tpm_getrandom_out, rng_data) +
-			      recd) {
-			total = -EFAULT;
-			break;
-		}
-		memcpy(dest, tpm_cmd.params.getrandom_out.rng_data, recd);
-
-		dest += recd;
-		total += recd;
-		num_bytes -= recd;
-	} while (retries-- && total < max);
+	if (chip->flags & TPM_CHIP_FLAG_TPM2)
+		rc = tpm2_get_random(chip, out, max);
+	else
+		rc = tpm1_get_random(chip, out, max);
 
 	tpm_put_ops(chip);
-	return total ? total : -EIO;
+	return rc;
 }
 EXPORT_SYMBOL_GPL(tpm_get_random);
 
diff --git a/drivers/char/tpm/tpm.h b/drivers/char/tpm/tpm.h
index 05c386b3ab12..22f89f41ad52 100644
--- a/drivers/char/tpm/tpm.h
+++ b/drivers/char/tpm/tpm.h
@@ -551,6 +551,7 @@  int tpm1_pcr_extend(struct tpm_chip *chip, int pcr_idx, const u8 *hash,
 		    const char *log_msg);
 ssize_t tpm1_getcap(struct tpm_chip *chip, u32 subcap_id, cap_t *cap,
 		    const char *desc, size_t min_cap_length);
+int tpm1_get_random(struct tpm_chip *chip, u8 *out, size_t max);
 unsigned long tpm_calc_ordinal_duration(struct tpm_chip *chip, u32 ordinal);
 int tpm_pm_suspend(struct device *dev);
 int tpm_pm_resume(struct device *dev);
diff --git a/drivers/char/tpm/tpm1-cmd.c b/drivers/char/tpm/tpm1-cmd.c
index 3bd079587ef5..e02f0c1c822f 100644
--- a/drivers/char/tpm/tpm1-cmd.c
+++ b/drivers/char/tpm/tpm1-cmd.c
@@ -469,3 +469,58 @@  ssize_t tpm1_getcap(struct tpm_chip *chip, u32 subcap_id, cap_t *cap,
 	return rc;
 }
 EXPORT_SYMBOL_GPL(tpm1_getcap);
+
+#define TPM_ORD_GET_RANDOM 70
+#define TPM_GETRANDOM_RESULT_SIZE	18
+static const struct tpm_input_header tpm_getrandom_header = {
+	.tag = cpu_to_be16(TPM_TAG_RQU_COMMAND),
+	.length = cpu_to_be32(14),
+	.ordinal = cpu_to_be32(TPM_ORD_GET_RANDOM)
+};
+
+int tpm1_get_random(struct tpm_chip *chip, u8 *out, size_t max)
+{
+	struct tpm_cmd_t tpm_cmd;
+	u32 recd;
+	u32 num_bytes = min_t(u32, max, TPM_MAX_RNG_DATA);
+	u32 rlength;
+	int err, total = 0, retries = 5;
+	u8 *dest = out;
+
+	if (!out || !num_bytes || max > TPM_MAX_RNG_DATA)
+		return -EINVAL;
+
+	do {
+		tpm_cmd.header.in = tpm_getrandom_header;
+		tpm_cmd.params.getrandom_in.num_bytes = cpu_to_be32(num_bytes);
+
+		err = tpm_transmit_cmd(chip, NULL, &tpm_cmd,
+				       TPM_GETRANDOM_RESULT_SIZE + num_bytes,
+				       offsetof(struct tpm_getrandom_out,
+						rng_data),
+				       0, "attempting get random");
+		if (err)
+			break;
+
+		recd = be32_to_cpu(tpm_cmd.params.getrandom_out.rng_data_len);
+		if (recd > num_bytes) {
+			total = -EFAULT;
+			break;
+		}
+
+		rlength = be32_to_cpu(tpm_cmd.header.out.length);
+		if (rlength < TPM_HEADER_SIZE +
+			      offsetof(struct tpm_getrandom_out, rng_data) +
+			      recd) {
+			total = -EFAULT;
+			break;
+		}
+		memcpy(dest, tpm_cmd.params.getrandom_out.rng_data, recd);
+
+		dest += recd;
+		total += recd;
+		num_bytes -= recd;
+	} while (retries-- && (size_t)total < max);
+
+	return total ? total : -EIO;
+}