TCG PC Client Platform Firmware Profile Spec mandates that an S-CRTM event for the version identifier using the event type EV_S_CRTM_VERSION must be measured.
So since we are trying to add more conformance into U-Boot, let's add the event using U_BOOT_VERSION_STRING, extend PCR[0] accordingly and log it in the EventLog
Signed-off-by: Ilias Apalodimas ilias.apalodimas@linaro.org --- Heinrich this won't apply without my previous patch fixing EFI TCG memory when the protocol installation fails
lib/efi_loader/efi_tcg2.c | 35 +++++++++++++++++++++++++++++++++++ 1 file changed, 35 insertions(+)
diff --git a/lib/efi_loader/efi_tcg2.c b/lib/efi_loader/efi_tcg2.c index 02de63808f9a..c0efd867a486 100644 --- a/lib/efi_loader/efi_tcg2.c +++ b/lib/efi_loader/efi_tcg2.c @@ -13,6 +13,7 @@ #include <efi_loader.h> #include <efi_tcg2.h> #include <log.h> +#include <version.h> #include <tpm-v2.h> #include <u-boot/sha1.h> #include <u-boot/sha256.h> @@ -1051,6 +1052,36 @@ out: return ret; }
+/** + * efi_append_scrtm_version - Append an S-CRTM EV_S_CRTM_VERSION event on the + * eventlog and extend the PCRs + * + * @dev: TPM device + * + * @Return: status code + */ +static efi_status_t efi_append_scrtm_version(struct udevice *dev) +{ + struct tpml_digest_values digest_list; + u8 ver[] = U_BOOT_VERSION_STRING; + const int pcr_index = 0; + efi_status_t ret; + + ret = tcg2_create_digest(ver, sizeof(ver), &digest_list); + if (ret != EFI_SUCCESS) + goto out; + + ret = tcg2_pcr_extend(dev, pcr_index, &digest_list); + if (ret != EFI_SUCCESS) + goto out; + + ret = tcg2_agile_log_append(pcr_index, EV_S_CRTM_VERSION, &digest_list, + sizeof(ver), ver); + +out: + return ret; +} + /** * efi_tcg2_register() - register EFI_TCG2_PROTOCOL * @@ -1074,6 +1105,10 @@ efi_status_t efi_tcg2_register(void) if (ret != EFI_SUCCESS) goto fail;
+ ret = efi_append_scrtm_version(dev); + if (ret != EFI_SUCCESS) + goto out; + ret = efi_add_protocol(efi_root, &efi_guid_tcg2_protocol, (void *)&efi_tcg2_protocol); if (ret != EFI_SUCCESS) {