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efi/libstub: Add get_event_log() support for CC platforms

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To allow event log info access after boot, EFI boot stub extracts
the event log information and installs it in an EFI configuration
table. Currently, EFI boot stub only supports installation of event
log only for TPM 1.2 and TPM 2.0 protocols. Extend the same support
for CC protocol. Since CC platform also uses TCG2 format, reuse TPM2
support code as much as possible.

Link: https://uefi.org/specs/UEFI/2.10/38_Confidential_Computing.html#efi-cc-measurement-protocol [1]
Signed-off-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com>
Link: https://lkml.kernel.org/r/0229a87e-fb19-4dad-99fc-4afd7ed4099a%40collabora.com
[ardb: Split out final events table handling to avoid version confusion]
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
This commit is contained in:
Kuppuswamy Sathyanarayanan 2024-02-15 03:00:02 +00:00 committed by Ard Biesheuvel
parent ac93cbfc2a
commit d228814b19
6 changed files with 61 additions and 31 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
drivers/firmware/efi/efi.c
View File

@ -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" },

2
drivers/firmware/efi/libstub/efi-stub.c
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@ -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();

4
drivers/firmware/efi/libstub/efistub.h
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@ -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);

82
drivers/firmware/efi/libstub/tpm.c
View File

@ -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);
}

2
drivers/firmware/efi/libstub/x86-stub.c
View File

@ -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);

1
include/linux/efi.h
View File

@ -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