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tpm: move TPM 1.2 code of tpm_pcr_extend() to tpm1_pcr_extend() 

In preparation of the modifications to tpm_pcr_extend(), which will
allow callers to supply a digest for each PCR bank of a TPM 2.0,
the TPM 1.2 specific code has been moved to tpm1_pcr_extend().

tpm1_pcr_extend() uses tpm_buf_init() to prepare the command buffer,
which offers protection against buffer overflow. It is called by
tpm_pcr_extend() and tpm_pm_suspend().

Signed-off-by: Roberto Sassu <roberto.sassu@huawei.com>
Reviewed-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Tested-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
This commit is contained in:
Roberto Sassu 2017-05-04 13:16:47 +02:00 committed by Jarkko Sakkinen
parent a69faebf4d
commit 175d5b2a57
1 changed files with 24 additions and 17 deletions
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41
drivers/char/tpm/tpm-interface.c
View File

@ -847,6 +847,25 @@ static const struct tpm_input_header pcrextend_header = {
.ordinal = cpu_to_be32(TPM_ORD_PCR_EXTEND) .ordinal = cpu_to_be32(TPM_ORD_PCR_EXTEND)
}; };
static int tpm1_pcr_extend(struct tpm_chip *chip, int pcr_idx, const u8 *hash,
char *log_msg)
{
struct tpm_buf buf;
int rc;
rc = tpm_buf_init(&buf, TPM_TAG_RQU_COMMAND, TPM_ORD_PCR_EXTEND);
if (rc)
return rc;
tpm_buf_append_u32(&buf, pcr_idx);
tpm_buf_append(&buf, hash, TPM_DIGEST_SIZE);
rc = tpm_transmit_cmd(chip, NULL, buf.data, EXTEND_PCR_RESULT_SIZE,
EXTEND_PCR_RESULT_BODY_SIZE, 0, log_msg);
tpm_buf_destroy(&buf);
return rc;
}
/** /**
* tpm_pcr_extend - extend pcr value with hash * tpm_pcr_extend - extend pcr value with hash
* @chip_num: tpm idx # or AN& * @chip_num: tpm idx # or AN&
@ -859,7 +878,6 @@ static const struct tpm_input_header pcrextend_header = {
*/ */
int tpm_pcr_extend(u32 chip_num, int pcr_idx, const u8 *hash) int tpm_pcr_extend(u32 chip_num, int pcr_idx, const u8 *hash)
{ {
struct tpm_cmd_t cmd;
int rc; int rc;
struct tpm_chip *chip; struct tpm_chip *chip;
struct tpm2_digest digest_list[ARRAY_SIZE(chip->active_banks)]; struct tpm2_digest digest_list[ARRAY_SIZE(chip->active_banks)];
@ -885,13 +903,8 @@ int tpm_pcr_extend(u32 chip_num, int pcr_idx, const u8 *hash)
return rc; return rc;
} }
cmd.header.in = pcrextend_header; rc = tpm1_pcr_extend(chip, pcr_idx, hash,
cmd.params.pcrextend_in.pcr_idx = cpu_to_be32(pcr_idx); "attempting extend a PCR value");
memcpy(cmd.params.pcrextend_in.hash, hash, TPM_DIGEST_SIZE);
rc = tpm_transmit_cmd(chip, NULL, &cmd, EXTEND_PCR_RESULT_SIZE,
EXTEND_PCR_RESULT_BODY_SIZE, 0,
"attempting extend a PCR value");
tpm_put_ops(chip); tpm_put_ops(chip);
return rc; return rc;
} }
@ -1090,15 +1103,9 @@ int tpm_pm_suspend(struct device *dev)
} }
/* for buggy tpm, flush pcrs with extend to selected dummy */ /* for buggy tpm, flush pcrs with extend to selected dummy */
if (tpm_suspend_pcr) { if (tpm_suspend_pcr)
cmd.header.in = pcrextend_header; rc = tpm1_pcr_extend(chip, tpm_suspend_pcr, dummy_hash,
cmd.params.pcrextend_in.pcr_idx = cpu_to_be32(tpm_suspend_pcr); "extending dummy pcr before suspend");
memcpy(cmd.params.pcrextend_in.hash, dummy_hash,
TPM_DIGEST_SIZE);
rc = tpm_transmit_cmd(chip, NULL, &cmd, EXTEND_PCR_RESULT_SIZE,
EXTEND_PCR_RESULT_BODY_SIZE, 0,
"extending dummy pcr before suspend");
}
/* now do the actual savestate */ /* now do the actual savestate */
for (try = 0; try < TPM_RETRY; try++) { for (try = 0; try < TPM_RETRY; try++) {