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efi_loader: add UEFI GPT measurement

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This commit adds the UEFI GPT disk partition topology
measurement required in TCG PC Client Platform Firmware
Profile Specification

Signed-off-by: Masahisa Kojima <masahisa.kojima@linaro.org>
This commit is contained in:
Masahisa Kojima 2021-10-26 17:27:25 +09:00 • committed by Heinrich Schuchardt
parent 3d49ee8510
commit ce3dbc5d08
6 changed files with 190 additions and 3 deletions
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146
lib/efi_loader/efi_tcg2.c
View file

@ -1528,12 +1528,152 @@ static void *find_smbios_table(void)
return NULL;
}
/**
* tcg2_measure_gpt_table() - measure gpt table
*
* @dev: TPM device
* @loaded_image: handle to the loaded image
*
* Return: status code
*/
static efi_status_t
tcg2_measure_gpt_data(struct udevice *dev,
struct efi_loaded_image_obj *loaded_image)
{
efi_status_t ret;
efi_handle_t handle;
struct efi_handler *dp_handler;
struct efi_device_path *orig_device_path;
struct efi_device_path *device_path;
struct efi_device_path *dp;
struct efi_block_io *block_io;
struct efi_gpt_data *event = NULL;
efi_guid_t null_guid = NULL_GUID;
gpt_header *gpt_h;
gpt_entry *entry = NULL;
gpt_entry *gpt_e;
u32 num_of_valid_entry = 0;
u32 event_size;
u32 i;
u32 total_gpt_entry_size;
ret = efi_search_protocol(&loaded_image->header,
&efi_guid_loaded_image_device_path,
&dp_handler);
if (ret != EFI_SUCCESS)
return ret;
orig_device_path = dp_handler->protocol_interface;
if (!orig_device_path) /* no device path, skip GPT measurement */
return EFI_SUCCESS;
device_path = efi_dp_dup(orig_device_path);
if (!device_path)
return EFI_OUT_OF_RESOURCES;
dp = search_gpt_dp_node(device_path);
if (!dp) {
/* no GPT device path node found, skip GPT measurement */
ret = EFI_SUCCESS;
goto out1;
}
/* read GPT header */
dp->type = DEVICE_PATH_TYPE_END;
dp->sub_type = DEVICE_PATH_SUB_TYPE_END;
dp = device_path;
ret = EFI_CALL(systab.boottime->locate_device_path(&efi_block_io_guid,
&dp, &handle));
if (ret != EFI_SUCCESS)
goto out1;
ret = EFI_CALL(efi_handle_protocol(handle,
&efi_block_io_guid, (void **)&block_io));
if (ret != EFI_SUCCESS)
goto out1;
gpt_h = memalign(block_io->media->io_align, block_io->media->block_size);
if (!gpt_h) {
ret = EFI_OUT_OF_RESOURCES;
goto out2;
}
ret = block_io->read_blocks(block_io, block_io->media->media_id, 1,
block_io->media->block_size, gpt_h);
if (ret != EFI_SUCCESS)
goto out2;
/* read GPT entry */
total_gpt_entry_size = gpt_h->num_partition_entries *
gpt_h->sizeof_partition_entry;
entry = memalign(block_io->media->io_align, total_gpt_entry_size);
if (!entry) {
ret = EFI_OUT_OF_RESOURCES;
goto out2;
}
ret = block_io->read_blocks(block_io, block_io->media->media_id,
gpt_h->partition_entry_lba,
total_gpt_entry_size, entry);
if (ret != EFI_SUCCESS)
goto out2;
/* count valid GPT entry */
gpt_e = entry;
for (i = 0; i < gpt_h->num_partition_entries; i++) {
if (guidcmp(&null_guid, &gpt_e->partition_type_guid))
num_of_valid_entry++;
gpt_e = (gpt_entry *)((u8 *)gpt_e + gpt_h->sizeof_partition_entry);
}
/* prepare event data for measurement */
event_size = sizeof(struct efi_gpt_data) +
(num_of_valid_entry * gpt_h->sizeof_partition_entry);
event = calloc(1, event_size);
if (!event) {
ret = EFI_OUT_OF_RESOURCES;
goto out2;
}
memcpy(event, gpt_h, sizeof(gpt_header));
put_unaligned_le64(num_of_valid_entry, &event->number_of_partitions);
/* copy valid GPT entry */
gpt_e = entry;
num_of_valid_entry = 0;
for (i = 0; i < gpt_h->num_partition_entries; i++) {
if (guidcmp(&null_guid, &gpt_e->partition_type_guid)) {
memcpy((u8 *)event->partitions +
(num_of_valid_entry * gpt_h->sizeof_partition_entry),
gpt_e, gpt_h->sizeof_partition_entry);
num_of_valid_entry++;
}
gpt_e = (gpt_entry *)((u8 *)gpt_e + gpt_h->sizeof_partition_entry);
}
ret = tcg2_measure_event(dev, 5, EV_EFI_GPT_EVENT, event_size, (u8 *)event);
if (ret != EFI_SUCCESS)
goto out2;
out2:
EFI_CALL(efi_close_protocol((efi_handle_t)block_io, &efi_block_io_guid,
NULL, NULL));
free(gpt_h);
free(entry);
free(event);
out1:
efi_free_pool(device_path);
return ret;
}
/**
* efi_tcg2_measure_efi_app_invocation() - measure efi app invocation
*
* Return: status code
*/
efi_status_t efi_tcg2_measure_efi_app_invocation(void)
efi_status_t efi_tcg2_measure_efi_app_invocation(struct efi_loaded_image_obj *handle)
{
efi_status_t ret;
u32 pcr_index;
@ -1565,6 +1705,10 @@ efi_status_t efi_tcg2_measure_efi_app_invocation(void)
goto out;
}
ret = tcg2_measure_gpt_data(dev, handle);
if (ret != EFI_SUCCESS)
goto out;
for (pcr_index = 0; pcr_index <= 7; pcr_index++) {
ret = tcg2_measure_event(dev, pcr_index, EV_SEPARATOR,
sizeof(event), (u8 *)&event);