From c5d0a2ea1fff572d6a61b4c6cb8b3661833f904f Mon Sep 17 00:00:00 2001 From: Joel Kitching Date: Fri, 12 Oct 2018 15:52:00 +0800 Subject: tpm2/tlcl_send_startup: should pass on TPM_E_INVALID_POSTINIT Change TSS layer tlcl_send_startup() to expose TPM_RC_INITIALIZE, which gets mapped to TPM_E_INVALID_POSTINIT. The return value is exposed to TSPI layer tpm_setup(), and dealt with as follows: - Regular startup: TPM_E_INVALID_POSTINIT should count as failure. - S3 resume: TPM_E_INVALID_POSTINIT can be assumed to mean that TPM maintains power during S3, and is already initialized. Also, correct an error where |response| could be erroneously accessed when it is set to NULL. BUG=b:114018226 TEST=compile coreboot Change-Id: Ib0c3750386ae04279401c1dc318c5019d39f5ecf Signed-off-by: Joel Kitching Reviewed-on: https://review.coreboot.org/29063 Tested-by: build bot (Jenkins) Reviewed-by: Paul Menzel Reviewed-by: Julius Werner Reviewed-by: Philipp Deppenwiese --- src/security/tpm/tss/tcg-2.0/tss.c | 18 +++++++++++++++--- 1 file changed, 15 insertions(+), 3 deletions(-) (limited to 'src/security') diff --git a/src/security/tpm/tss/tcg-2.0/tss.c b/src/security/tpm/tss/tcg-2.0/tss.c index e6ec57c811..c67fdfaa49 100644 --- a/src/security/tpm/tss/tcg-2.0/tss.c +++ b/src/security/tpm/tss/tcg-2.0/tss.c @@ -61,12 +61,24 @@ static uint32_t tlcl_send_startup(TPM_SU type) startup.startup_type = type; response = tpm_process_command(TPM2_Startup, &startup); - if (response && (response->hdr.tpm_code == 0 || - response->hdr.tpm_code == TPM_RC_INITIALIZE)) { - return TPM_SUCCESS; + /* IO error, tpm2_response pointer is empty. */ + if (response == NULL) { + printk(BIOS_ERR, "%s: TPM communication error\n", __func__); + return TPM_E_IOERROR; } + printk(BIOS_INFO, "%s: Startup return code is %x\n", __func__, response->hdr.tpm_code); + + switch (response->hdr.tpm_code) { + case TPM_RC_INITIALIZE: + /* TPM already initialized. */ + return TPM_E_INVALID_POSTINIT; + case TPM2_RC_SUCCESS: + return TPM_SUCCESS; + } + + /* Collapse any other errors into TPM_E_IOERROR. */ return TPM_E_IOERROR; } -- cgit v1.2.3