diff --git a/drivers/firmware/efi/efi.c b/drivers/firmware/efi/efi.c index f6cfd29308d9..8859fb0b006d 100644 --- a/drivers/firmware/efi/efi.c +++ b/drivers/firmware/efi/efi.c @@ -598,6 +598,7 @@ static const efi_config_table_type_t common_tables[] __initconst = { {LINUX_EFI_RANDOM_SEED_TABLE_GUID, &efi_rng_seed, "RNG" }, {LINUX_EFI_TPM_EVENT_LOG_GUID, &efi.tpm_log, "TPMEventLog" }, {EFI_TCG2_FINAL_EVENTS_TABLE_GUID, &efi.tpm_final_log, "TPMFinalLog" }, + {EFI_CC_FINAL_EVENTS_TABLE_GUID, &efi.tpm_final_log, "CCFinalLog" }, {LINUX_EFI_MEMRESERVE_TABLE_GUID, &mem_reserve, "MEMRESERVE" }, {LINUX_EFI_INITRD_MEDIA_GUID, &initrd, "INITRD" }, {EFI_RT_PROPERTIES_TABLE_GUID, &rt_prop, "RTPROP" }, diff --git a/drivers/firmware/efi/libstub/efi-stub.c b/drivers/firmware/efi/libstub/efi-stub.c index f9c1e8a2bd1d..958a680e0660 100644 --- a/drivers/firmware/efi/libstub/efi-stub.c +++ b/drivers/firmware/efi/libstub/efi-stub.c @@ -167,7 +167,7 @@ efi_status_t efi_stub_common(efi_handle_t handle, si = setup_graphics(); - efi_retrieve_tpm2_eventlog(); + efi_retrieve_eventlog(); /* Ask the firmware to clear memory on unclean shutdown */ efi_enable_reset_attack_mitigation(); diff --git a/drivers/firmware/efi/libstub/efistub.h b/drivers/firmware/efi/libstub/efistub.h index 6b020aadcf94..df174edfc228 100644 --- a/drivers/firmware/efi/libstub/efistub.h +++ b/drivers/firmware/efi/libstub/efistub.h @@ -929,6 +929,8 @@ typedef struct { #define EFI_CC_BOOT_HASH_ALG_SHA384 0x00000004 +#define EFI_CC_EVENT_LOG_FORMAT_TCG_2 0x00000002 + typedef union efi_cc_protocol efi_cc_protocol_t; union efi_cc_protocol { @@ -1140,7 +1142,7 @@ static inline void efi_enable_reset_attack_mitigation(void) { } #endif -void efi_retrieve_tpm2_eventlog(void); +void efi_retrieve_eventlog(void); struct screen_info *alloc_screen_info(void); struct screen_info *__alloc_screen_info(void); diff --git a/drivers/firmware/efi/libstub/tpm.c b/drivers/firmware/efi/libstub/tpm.c index a880f7374c27..df3182f2e63a 100644 --- a/drivers/firmware/efi/libstub/tpm.c +++ b/drivers/firmware/efi/libstub/tpm.c @@ -47,39 +47,18 @@ void efi_enable_reset_attack_mitigation(void) #endif -void efi_retrieve_tpm2_eventlog(void) +static void efi_retrieve_tcg2_eventlog(int version, efi_physical_addr_t log_location, + efi_physical_addr_t log_last_entry, + efi_bool_t truncated, + struct efi_tcg2_final_events_table *final_events_table) { - efi_guid_t tcg2_guid = EFI_TCG2_PROTOCOL_GUID; efi_guid_t linux_eventlog_guid = LINUX_EFI_TPM_EVENT_LOG_GUID; efi_status_t status; - efi_physical_addr_t log_location = 0, log_last_entry = 0; struct linux_efi_tpm_eventlog *log_tbl = NULL; - struct efi_tcg2_final_events_table *final_events_table = NULL; unsigned long first_entry_addr, last_entry_addr; size_t log_size, last_entry_size; - efi_bool_t truncated; - int version = EFI_TCG2_EVENT_LOG_FORMAT_TCG_2; - efi_tcg2_protocol_t *tcg2_protocol = NULL; int final_events_size = 0; - status = efi_bs_call(locate_protocol, &tcg2_guid, NULL, - (void **)&tcg2_protocol); - if (status != EFI_SUCCESS) - return; - - status = efi_call_proto(tcg2_protocol, get_event_log, version, - &log_location, &log_last_entry, &truncated); - - if (status != EFI_SUCCESS || !log_location) { - version = EFI_TCG2_EVENT_LOG_FORMAT_TCG_1_2; - status = efi_call_proto(tcg2_protocol, get_event_log, version, - &log_location, &log_last_entry, - &truncated); - if (status != EFI_SUCCESS || !log_location) - return; - - } - first_entry_addr = (unsigned long) log_location; /* @@ -93,8 +72,10 @@ void efi_retrieve_tpm2_eventlog(void) * get_event_log only returns the address of the last entry. * We need to calculate its size to deduce the full size of * the logs. + * + * CC Event log also uses TCG2 format, handle it same as TPM2. */ - if (version == EFI_TCG2_EVENT_LOG_FORMAT_TCG_2) { + if (version > EFI_TCG2_EVENT_LOG_FORMAT_TCG_1_2) { /* * The TCG2 log format has variable length entries, * and the information to decode the hash algorithms @@ -127,8 +108,6 @@ void efi_retrieve_tpm2_eventlog(void) * Figure out whether any events have already been logged to the * final events structure, and if so how much space they take up */ - if (version == EFI_TCG2_EVENT_LOG_FORMAT_TCG_2) - final_events_table = get_efi_config_table(EFI_TCG2_FINAL_EVENTS_TABLE_GUID); if (final_events_table && final_events_table->nr_events) { struct tcg_pcr_event2_head *header; int offset; @@ -165,3 +144,50 @@ void efi_retrieve_tpm2_eventlog(void) err_free: efi_bs_call(free_pool, log_tbl); } + +void efi_retrieve_eventlog(void) +{ + struct efi_tcg2_final_events_table *final_events_table = NULL; + efi_physical_addr_t log_location = 0, log_last_entry = 0; + efi_guid_t tpm2_guid = EFI_TCG2_PROTOCOL_GUID; + int version = EFI_TCG2_EVENT_LOG_FORMAT_TCG_2; + efi_tcg2_protocol_t *tpm2 = NULL; + efi_bool_t truncated; + efi_status_t status; + + status = efi_bs_call(locate_protocol, &tpm2_guid, NULL, (void **)&tpm2); + if (status == EFI_SUCCESS) { + status = efi_call_proto(tpm2, get_event_log, version, &log_location, + &log_last_entry, &truncated); + + if (status != EFI_SUCCESS || !log_location) { + version = EFI_TCG2_EVENT_LOG_FORMAT_TCG_1_2; + status = efi_call_proto(tpm2, get_event_log, version, + &log_location, &log_last_entry, + &truncated); + } else { + final_events_table = + get_efi_config_table(EFI_TCG2_FINAL_EVENTS_TABLE_GUID); + } + } else { + efi_guid_t cc_guid = EFI_CC_MEASUREMENT_PROTOCOL_GUID; + efi_cc_protocol_t *cc = NULL; + + status = efi_bs_call(locate_protocol, &cc_guid, NULL, (void **)&cc); + if (status != EFI_SUCCESS) + return; + + version = EFI_CC_EVENT_LOG_FORMAT_TCG_2; + status = efi_call_proto(cc, get_event_log, version, &log_location, + &log_last_entry, &truncated); + + final_events_table = + get_efi_config_table(EFI_CC_FINAL_EVENTS_TABLE_GUID); + } + + if (status != EFI_SUCCESS || !log_location) + return; + + efi_retrieve_tcg2_eventlog(version, log_location, log_last_entry, + truncated, final_events_table); +} diff --git a/drivers/firmware/efi/libstub/x86-stub.c b/drivers/firmware/efi/libstub/x86-stub.c index 99429bc4b0c7..d09aa13c7ff0 100644 --- a/drivers/firmware/efi/libstub/x86-stub.c +++ b/drivers/firmware/efi/libstub/x86-stub.c @@ -923,7 +923,7 @@ void __noreturn efi_stub_entry(efi_handle_t handle, efi_random_get_seed(); - efi_retrieve_tpm2_eventlog(); + efi_retrieve_eventlog(); setup_graphics(boot_params); diff --git a/include/linux/efi.h b/include/linux/efi.h index 2493d3d4429b..f0d56f106b60 100644 --- a/include/linux/efi.h +++ b/include/linux/efi.h @@ -402,6 +402,7 @@ void efi_native_runtime_setup(void); #define EFI_CERT_X509_SHA256_GUID EFI_GUID(0x3bd2a492, 0x96c0, 0x4079, 0xb4, 0x20, 0xfc, 0xf9, 0x8e, 0xf1, 0x03, 0xed) #define EFI_CC_BLOB_GUID EFI_GUID(0x067b1f5f, 0xcf26, 0x44c5, 0x85, 0x54, 0x93, 0xd7, 0x77, 0x91, 0x2d, 0x42) #define EFI_CC_MEASUREMENT_PROTOCOL_GUID EFI_GUID(0x96751a3d, 0x72f4, 0x41a6, 0xa7, 0x94, 0xed, 0x5d, 0x0e, 0x67, 0xae, 0x6b) +#define EFI_CC_FINAL_EVENTS_TABLE_GUID EFI_GUID(0xdd4a4648, 0x2de7, 0x4665, 0x96, 0x4d, 0x21, 0xd9, 0xef, 0x5f, 0xb4, 0x46) /* * This GUID is used to pass to the kernel proper the struct screen_info