From 9315e73ac87065acd898d3f15b9f524ca86736a7 Mon Sep 17 00:00:00 2001 From: Tomas Winkler Date: Fri, 19 Oct 2018 21:23:05 +0300 Subject: [PATCH] tpm1: reimplement SAVESTATE using tpm_buf In tpm1_pm_suspend() function reimplement, TPM_ORD_SAVESTATE comamnd using tpm_buf. Signed-off-by: Tomas Winkler Reviewed-by: Jarkko Sakkinen Tested-by: Jarkko Sakkinen Signed-off-by: Jarkko Sakkinen --- drivers/char/tpm/tpm1-cmd.c | 22 ++++++++++++---------- 1 file changed, 12 insertions(+), 10 deletions(-) diff --git a/drivers/char/tpm/tpm1-cmd.c b/drivers/char/tpm/tpm1-cmd.c index 05b772477bac..d418a27a75e0 100644 --- a/drivers/char/tpm/tpm1-cmd.c +++ b/drivers/char/tpm/tpm1-cmd.c @@ -718,12 +718,6 @@ out: } #define TPM_ORD_SAVESTATE 152 -#define SAVESTATE_RESULT_SIZE 10 -static const struct tpm_input_header savestate_header = { - .tag = cpu_to_be16(TPM_TAG_RQU_COMMAND), - .length = cpu_to_be32(10), - .ordinal = cpu_to_be32(TPM_ORD_SAVESTATE) -}; /** * tpm1_pm_suspend() - pm suspend handler @@ -739,18 +733,22 @@ static const struct tpm_input_header savestate_header = { int tpm1_pm_suspend(struct tpm_chip *chip, int tpm_suspend_pcr) { u8 dummy_hash[TPM_DIGEST_SIZE] = { 0 }; - struct tpm_cmd_t cmd; - int rc, try; + struct tpm_buf buf; + unsigned int try; + int rc; + /* for buggy tpm, flush pcrs with extend to selected dummy */ if (tpm_suspend_pcr) rc = tpm1_pcr_extend(chip, tpm_suspend_pcr, dummy_hash, "extending dummy pcr before suspend"); + rc = tpm_buf_init(&buf, TPM_TAG_RQU_COMMAND, TPM_ORD_SAVESTATE); + if (rc) + return rc; /* now do the actual savestate */ for (try = 0; try < TPM_RETRY; try++) { - cmd.header.in = savestate_header; - rc = tpm_transmit_cmd(chip, NULL, &cmd, SAVESTATE_RESULT_SIZE, + rc = tpm_transmit_cmd(chip, NULL, buf.data, PAGE_SIZE, 0, 0, NULL); /* @@ -766,6 +764,8 @@ int tpm1_pm_suspend(struct tpm_chip *chip, int tpm_suspend_pcr) if (rc != TPM_WARN_RETRY) break; tpm_msleep(TPM_TIMEOUT_RETRY); + + tpm_buf_reset(&buf, TPM_TAG_RQU_COMMAND, TPM_ORD_SAVESTATE); } if (rc) @@ -775,6 +775,8 @@ int tpm1_pm_suspend(struct tpm_chip *chip, int tpm_suspend_pcr) dev_warn(&chip->dev, "TPM savestate took %dms\n", try * TPM_TIMEOUT_RETRY); + tpm_buf_destroy(&buf); + return rc; }