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security/intel/txt/ramstage.c: Fix clearing secrets on CBNT 

intel_txt_memory_has_secret() checks for ESTS.TXT_ESTS_WAKE_ERROR_STS
|| E2STS.TXT_E2STS_SECRET_STS and it looks like with CBNT the E2STS
bit can be set without the ESTS bit.

Change-Id: Iff4436501b84f5c209add845b3cd3a62782d17e6
Signed-off-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/47934
Reviewed-by: Jonathan Zhang <jonzhang@fb.com>
Reviewed-by: Christian Walter <christian.walter@9elements.com>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
This commit is contained in:
Arthur Heymans 2020-11-24 17:37:11 +01:00 committed by Patrick Georgi
parent b513c53f31
commit bccb6916fe
1 changed files with 14 additions and 16 deletions
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30
src/security/intel/txt/ramstage.c
View File

@ -89,23 +89,21 @@ static void check_secrets_txt(void *unused)
if (status & ACMSTS_TXT_DISABLED)
return;
/* Check for fatal ACM error and TXT reset */
if (get_wake_error_status()) {
/*
* Check if secrets bit needs to be reset. Only platforms that support
* CONFIG(PLATFORM_HAS_DRAM_CLEAR) will be able to run this code.
* Assume all memory really was cleared.
*
* TXT will issue a platform reset to come up sober.
*/
if (intel_txt_memory_has_secrets()) {
printk(BIOS_INFO, "TEE-TXT: Wiping TEE...\n");
intel_txt_run_bios_acm(ACMINPUT_CLEAR_SECRETS);
/*
* Check if secrets bit needs to be reset. Only platforms that support
* CONFIG(PLATFORM_HAS_DRAM_CLEAR) will be able to run this code.
* On some platforms FSP-M takes care of the DRAM clearing.
* Assume all memory really was cleared.
*
* TXT will issue a platform reset to come up sober.
*/
if (intel_txt_memory_has_secrets()) {
printk(BIOS_INFO, "TEE-TXT: Wiping TEE...\n");
intel_txt_run_bios_acm(ACMINPUT_CLEAR_SECRETS);
/* Should never reach this point ... */
intel_txt_log_acm_error(read32((void *)TXT_BIOSACM_ERRORCODE));
die("Waiting for platform reset...\n");
}
/* Should never reach this point ... */
intel_txt_log_acm_error(read32((void *)TXT_BIOSACM_ERRORCODE));
die("Waiting for platform reset...\n");
}
}