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path: root/drivers/firmware/efi/libstub/efi-stub-helper.c
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Diffstat (limited to 'drivers/firmware/efi/libstub/efi-stub-helper.c')
-rw-r--r--drivers/firmware/efi/libstub/efi-stub-helper.c98
1 files changed, 70 insertions, 28 deletions
diff --git a/drivers/firmware/efi/libstub/efi-stub-helper.c b/drivers/firmware/efi/libstub/efi-stub-helper.c
index 3dc2f9aaf0..de659f6a81 100644
--- a/drivers/firmware/efi/libstub/efi-stub-helper.c
+++ b/drivers/firmware/efi/libstub/efi-stub-helper.c
@@ -11,6 +11,7 @@
#include <linux/efi.h>
#include <linux/kernel.h>
+#include <linux/overflow.h>
#include <asm/efi.h>
#include <asm/setup.h>
@@ -201,7 +202,7 @@ void efi_apply_loadoptions_quirk(const void **load_options, u32 *load_options_si
*load_options_size = load_option_unpacked.optional_data_size;
}
-enum efistub_event {
+enum efistub_event_type {
EFISTUB_EVT_INITRD,
EFISTUB_EVT_LOAD_OPTIONS,
EFISTUB_EVT_COUNT,
@@ -227,54 +228,95 @@ static const struct {
},
};
+static_assert(sizeof(efi_tcg2_event_t) == sizeof(efi_cc_event_t));
+
+union efistub_event {
+ efi_tcg2_event_t tcg2_data;
+ efi_cc_event_t cc_data;
+};
+
+struct efistub_measured_event {
+ union efistub_event event_data;
+ TCG_PCClientTaggedEvent tagged_event __packed;
+};
+
static efi_status_t efi_measure_tagged_event(unsigned long load_addr,
unsigned long load_size,
- enum efistub_event event)
+ enum efistub_event_type event)
{
+ union {
+ efi_status_t
+ (__efiapi *hash_log_extend_event)(void *, u64, efi_physical_addr_t,
+ u64, const union efistub_event *);
+ struct { u32 hash_log_extend_event; } mixed_mode;
+ } method;
+ struct efistub_measured_event *evt;
+ int size = struct_size(evt, tagged_event.tagged_event_data,
+ events[event].event_data_len);
efi_guid_t tcg2_guid = EFI_TCG2_PROTOCOL_GUID;
efi_tcg2_protocol_t *tcg2 = NULL;
+ union efistub_event ev;
efi_status_t status;
+ void *protocol;
efi_bs_call(locate_protocol, &tcg2_guid, NULL, (void **)&tcg2);
if (tcg2) {
- struct efi_measured_event {
- efi_tcg2_event_t event_data;
- efi_tcg2_tagged_event_t tagged_event;
- u8 tagged_event_data[];
- } *evt;
- int size = sizeof(*evt) + events[event].event_data_len;
-
- status = efi_bs_call(allocate_pool, EFI_LOADER_DATA, size,
- (void **)&evt);
- if (status != EFI_SUCCESS)
- goto fail;
-
- evt->event_data = (struct efi_tcg2_event){
+ ev.tcg2_data = (struct efi_tcg2_event){
.event_size = size,
- .event_header.header_size = sizeof(evt->event_data.event_header),
+ .event_header.header_size = sizeof(ev.tcg2_data.event_header),
.event_header.header_version = EFI_TCG2_EVENT_HEADER_VERSION,
.event_header.pcr_index = events[event].pcr_index,
.event_header.event_type = EV_EVENT_TAG,
};
+ protocol = tcg2;
+ method.hash_log_extend_event =
+ (void *)efi_table_attr(tcg2, hash_log_extend_event);
+ } else {
+ efi_guid_t cc_guid = EFI_CC_MEASUREMENT_PROTOCOL_GUID;
+ efi_cc_protocol_t *cc = NULL;
- evt->tagged_event = (struct efi_tcg2_tagged_event){
- .tagged_event_id = events[event].event_id,
- .tagged_event_data_size = events[event].event_data_len,
- };
-
- memcpy(evt->tagged_event_data, events[event].event_data,
- events[event].event_data_len);
+ efi_bs_call(locate_protocol, &cc_guid, NULL, (void **)&cc);
+ if (!cc)
+ return EFI_UNSUPPORTED;
- status = efi_call_proto(tcg2, hash_log_extend_event, 0,
- load_addr, load_size, &evt->event_data);
- efi_bs_call(free_pool, evt);
+ ev.cc_data = (struct efi_cc_event){
+ .event_size = size,
+ .event_header.header_size = sizeof(ev.cc_data.event_header),
+ .event_header.header_version = EFI_CC_EVENT_HEADER_VERSION,
+ .event_header.event_type = EV_EVENT_TAG,
+ };
+ status = efi_call_proto(cc, map_pcr_to_mr_index,
+ events[event].pcr_index,
+ &ev.cc_data.event_header.mr_index);
if (status != EFI_SUCCESS)
goto fail;
- return EFI_SUCCESS;
+
+ protocol = cc;
+ method.hash_log_extend_event =
+ (void *)efi_table_attr(cc, hash_log_extend_event);
}
- return EFI_UNSUPPORTED;
+ status = efi_bs_call(allocate_pool, EFI_LOADER_DATA, size, (void **)&evt);
+ if (status != EFI_SUCCESS)
+ goto fail;
+
+ *evt = (struct efistub_measured_event) {
+ .event_data = ev,
+ .tagged_event.tagged_event_id = events[event].event_id,
+ .tagged_event.tagged_event_data_size = events[event].event_data_len,
+ };
+
+ memcpy(evt->tagged_event.tagged_event_data, events[event].event_data,
+ events[event].event_data_len);
+
+ status = efi_fn_call(&method, hash_log_extend_event, protocol, 0,
+ load_addr, load_size, &evt->event_data);
+ efi_bs_call(free_pool, evt);
+
+ if (status == EFI_SUCCESS)
+ return EFI_SUCCESS;
+
fail:
efi_warn("Failed to measure data for event %d: 0x%lx\n", event, status);
return status;