From 433d390f005d3a89dba5a03a87b5a6c242748de3 Mon Sep 17 00:00:00 2001 From: Tomas Winkler Date: Fri, 19 Oct 2018 21:22:55 +0300 Subject: tpm: factor out tpm1_get_random into tpm1-cmd.c 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 Reviewed-by: Jarkko Sakkinen Tested-by: Jarkko Sakkinen Signed-off-by: Jarkko Sakkinen --- 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 a94a88f9f91c..a2205f26c74c 100644 --- a/drivers/char/tpm/tpm-interface.c +++ b/drivers/char/tpm/tpm-interface.c @@ -811,14 +811,6 @@ 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 @@ -829,58 +821,22 @@ 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; +} -- cgit v1.2.3