[PATCH v2] efi_loader: migrate SMBIOS 3.0 entry point structure for measurement
Ilias Apalodimas
ilias.apalodimas at linaro.org
Fri Jan 26 09:06:22 CET 2024
On Fri, 26 Jan 2024 at 02:56, Masahisa Kojima
<masahisa.kojima at linaro.org> wrote:
>
> Current U-Boot only supports the SMBIOS 3.0 entry point structure.
> TCG2 measurement code should migrate to SMBIOS 3.0 entry
> point structure.
>
> efi_selftest tcg2 test also needs to be updated, and expected
> PCR[1] result is changed since guid for SMBIOS EFI system table
> uses different guid SMBIOS3_TABLE_GUID instead of SMBIOS_TABLE_GUID.
>
> Signed-off-by: Masahisa Kojima <masahisa.kojima at linaro.org>
> ---
> Changes in v2:
> - add SMBIOS 3.0 anchor string check
>
> include/efi_loader.h | 1 +
> include/smbios.h | 4 +-
> lib/efi_loader/efi_tcg2.c | 19 ++++--
> lib/efi_selftest/efi_selftest_tcg2.c | 97 +++++++++++++---------------
> lib/smbios-parser.c | 9 ++-
> 5 files changed, 66 insertions(+), 64 deletions(-)
>
> diff --git a/include/efi_loader.h b/include/efi_loader.h
> index d5fca2fa5e..5c5af4f7fd 100644
> --- a/include/efi_loader.h
> +++ b/include/efi_loader.h
> @@ -340,6 +340,7 @@ extern const efi_guid_t efi_guid_firmware_management_protocol;
> extern const efi_guid_t efi_esrt_guid;
> /* GUID of the SMBIOS table */
> extern const efi_guid_t smbios_guid;
> +extern const efi_guid_t smbios3_guid;
> /*GUID of console */
> extern const efi_guid_t efi_guid_text_input_protocol;
> extern const efi_guid_t efi_guid_text_output_protocol;
> diff --git a/include/smbios.h b/include/smbios.h
> index b507b9d9d7..e45303d0d3 100644
> --- a/include/smbios.h
> +++ b/include/smbios.h
> @@ -326,10 +326,10 @@ int smbios_update_version_full(void *smbios_tab, const char *version);
> * This function clear the device dependent parameters such as
> * serial number for the measurement.
> *
> - * @entry: pointer to a struct smbios_entry
> + * @entry: pointer to a struct smbios3_entry
> * @header: pointer to a struct smbios_header
> */
> -void smbios_prepare_measurement(const struct smbios_entry *entry,
> +void smbios_prepare_measurement(const struct smbios3_entry *entry,
> struct smbios_header *header);
>
> #endif /* _SMBIOS_H_ */
> diff --git a/lib/efi_loader/efi_tcg2.c b/lib/efi_loader/efi_tcg2.c
> index 8db35d0b3c..85562c50a1 100644
> --- a/lib/efi_loader/efi_tcg2.c
> +++ b/lib/efi_loader/efi_tcg2.c
> @@ -1075,12 +1075,17 @@ error:
> */
> static efi_status_t
> tcg2_measure_smbios(struct udevice *dev,
> - const struct smbios_entry *entry)
> + const struct smbios3_entry *entry)
> {
> efi_status_t ret;
> struct smbios_header *smbios_copy;
> struct smbios_handoff_table_pointers2 *event = NULL;
> u32 event_size;
> + const char smbios3_anchor[] = "_SM3_";
> +
> + /* We only support SMBIOS 3.0 Entry Point structure */
> + if (memcmp(entry->anchor, smbios3_anchor, sizeof(smbios3_anchor) - 1))
> + return EFI_UNSUPPORTED;
>
> /*
> * TCG PC Client PFP Spec says
> @@ -1093,7 +1098,7 @@ tcg2_measure_smbios(struct udevice *dev,
> */
> event_size = sizeof(struct smbios_handoff_table_pointers2) +
> FIELD_SIZEOF(struct efi_configuration_table, guid) +
> - entry->struct_table_length;
> + entry->max_struct_size;
> event = calloc(1, event_size);
> if (!event) {
> ret = EFI_OUT_OF_RESOURCES;
> @@ -1104,11 +1109,11 @@ tcg2_measure_smbios(struct udevice *dev,
> memcpy(event->table_description, SMBIOS_HANDOFF_TABLE_DESC,
> sizeof(SMBIOS_HANDOFF_TABLE_DESC));
> put_unaligned_le64(1, &event->number_of_tables);
> - guidcpy(&event->table_entry[0].guid, &smbios_guid);
> + guidcpy(&event->table_entry[0].guid, &smbios3_guid);
> smbios_copy = (struct smbios_header *)((uintptr_t)&event->table_entry[0].table);
> memcpy(&event->table_entry[0].table,
> (void *)((uintptr_t)entry->struct_table_address),
> - entry->struct_table_length);
> + entry->max_struct_size);
>
> smbios_prepare_measurement(entry, smbios_copy);
>
> @@ -1133,7 +1138,7 @@ static void *find_smbios_table(void)
> u32 i;
>
> for (i = 0; i < systab.nr_tables; i++) {
> - if (!guidcmp(&smbios_guid, &systab.tables[i].guid))
> + if (!guidcmp(&smbios3_guid, &systab.tables[i].guid))
> return systab.tables[i].table;
> }
>
> @@ -1360,7 +1365,7 @@ efi_status_t efi_tcg2_measure_efi_app_invocation(struct efi_loaded_image_obj *ha
> u32 pcr_index;
> struct udevice *dev;
> u32 event = 0;
> - struct smbios_entry *entry;
> + struct smbios3_entry *entry;
>
> if (!is_tcg2_protocol_installed())
> return EFI_SUCCESS;
> @@ -1382,7 +1387,7 @@ efi_status_t efi_tcg2_measure_efi_app_invocation(struct efi_loaded_image_obj *ha
> if (ret != EFI_SUCCESS)
> goto out;
>
> - entry = (struct smbios_entry *)find_smbios_table();
> + entry = (struct smbios3_entry *)find_smbios_table();
> if (entry) {
> ret = tcg2_measure_smbios(dev, entry);
> if (ret != EFI_SUCCESS)
> diff --git a/lib/efi_selftest/efi_selftest_tcg2.c b/lib/efi_selftest/efi_selftest_tcg2.c
> index 67a886efaa..fb8b997653 100644
> --- a/lib/efi_selftest/efi_selftest_tcg2.c
> +++ b/lib/efi_selftest/efi_selftest_tcg2.c
> @@ -126,41 +126,40 @@ static u8 boot_order[] = {0x02, 0x10, 0x00, 0x10, 0x01, 0x10};
>
> static void *orig_smbios_table;
> static u64 dmi_addr = U32_MAX;
> -#define SMBIOS_ENTRY_HEADER_SIZE 0x20
> +#define SMBIOS3_ENTRY_HEADER_SIZE 0x18
> /* smbios table for the measurement test */
> -static u8 smbios_table_test[] = {
> -0x5f, 0x53, 0x4d, 0x5f, 0x2c, 0x1f, 0x03, 0x00, 0x54, 0x00, 0x00, 0x00,
> -0x00, 0x00, 0x00, 0x00, 0x5f, 0x44, 0x4d, 0x49, 0x5f, 0xe4, 0x5c, 0x01,
> -0x20, 0x00, 0x00, 0x00, 0x07, 0x00, 0x00, 0x00, 0x00, 0x18, 0x00, 0x00,
> -0x01, 0x02, 0x00, 0x00, 0x03, 0x00, 0x80, 0x08, 0x01, 0x00, 0x00, 0x00,
> -0x00, 0x00, 0x00, 0x0c, 0x15, 0x0a, 0xff, 0xff, 0x55, 0x2d, 0x42, 0x6f,
> -0x6f, 0x74, 0x00, 0x32, 0x30, 0x32, 0x31, 0x2e, 0x31, 0x30, 0x2d, 0x72,
> -0x63, 0x34, 0x2d, 0x30, 0x30, 0x30, 0x30, 0x35, 0x2d, 0x67, 0x37, 0x32,
> -0x37, 0x63, 0x33, 0x66, 0x33, 0x32, 0x35, 0x39, 0x2d, 0x64, 0x69, 0x72,
> -0x74, 0x79, 0x00, 0x31, 0x30, 0x2f, 0x30, 0x31, 0x2f, 0x32, 0x30, 0x32,
> -0x31, 0x00, 0x00, 0x01, 0x1b, 0x01, 0x00, 0x01, 0x02, 0x00, 0x03, 0x31,
> -0x32, 0x33, 0x34, 0x35, 0x36, 0x37, 0x38, 0x00, 0x00, 0x00, 0x00, 0x00,
> -0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x55, 0x6e, 0x6b, 0x6e, 0x6f, 0x77,
> -0x6e, 0x00, 0x55, 0x6e, 0x6b, 0x6e, 0x6f, 0x77, 0x6e, 0x20, 0x50, 0x72,
> -0x6f, 0x64, 0x75, 0x63, 0x74, 0x00, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36,
> -0x37, 0x38, 0x00, 0x00, 0x02, 0x0e, 0x02, 0x00, 0x01, 0x02, 0x00, 0x04,
> -0x03, 0x01, 0x01, 0x01, 0x00, 0x0a, 0x55, 0x6e, 0x6b, 0x6e, 0x6f, 0x77,
> -0x6e, 0x00, 0x55, 0x6e, 0x6b, 0x6e, 0x6f, 0x77, 0x6e, 0x20, 0x50, 0x72,
> -0x6f, 0x64, 0x75, 0x63, 0x74, 0x00, 0x33, 0x33, 0x33, 0x33, 0x33, 0x33,
> -0x33, 0x33, 0x00, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, 0x38, 0x00,
> -0x00, 0x03, 0x15, 0x03, 0x00, 0x01, 0x03, 0x00, 0x02, 0x03, 0x03, 0x03,
> -0x03, 0x03, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x55, 0x6e,
> -0x6b, 0x6e, 0x6f, 0x77, 0x6e, 0x00, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36,
> -0x37, 0x38, 0x00, 0x33, 0x33, 0x33, 0x33, 0x33, 0x33, 0x33, 0x33, 0x00,
> -0x00, 0x04, 0x30, 0x04, 0x00, 0x00, 0x03, 0x02, 0x01, 0x00, 0x00, 0x00,
> -0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x0c, 0x00, 0x00, 0x00, 0x00, 0x00,
> -0x00, 0x01, 0x06, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x02, 0x03, 0x04,
> -0x04, 0x04, 0x08, 0x00, 0x00, 0x02, 0x00, 0x08, 0x00, 0x08, 0x00, 0x01,
> -0x00, 0x55, 0x6e, 0x6b, 0x6e, 0x6f, 0x77, 0x6e, 0x00, 0x31, 0x32, 0x33,
> -0x34, 0x35, 0x36, 0x37, 0x38, 0x00, 0x33, 0x33, 0x33, 0x33, 0x33, 0x33,
> -0x33, 0x33, 0x00, 0x35, 0x35, 0x35, 0x35, 0x35, 0x35, 0x35, 0x35, 0x00,
> -0x00, 0x20, 0x0b, 0x05, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
> -0x00, 0x00, 0x7f, 0x04, 0x06, 0x00, 0x00, 0x00
> +static u8 smbios3_table_test[] = {
> +0x5f, 0x53, 0x4d, 0x33, 0x5f, 0x00, 0x18, 0x03, 0x07, 0x00, 0x01, 0x00,
> +0x5c, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
> +0x00, 0x18, 0x00, 0x00, 0x01, 0x02, 0x00, 0x00, 0x03, 0x00, 0x80, 0x08,
> +0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x0c, 0x15, 0x0a, 0xff, 0xff,
> +0x55, 0x2d, 0x42, 0x6f, 0x6f, 0x74, 0x00, 0x32, 0x30, 0x32, 0x31, 0x2e,
> +0x31, 0x30, 0x2d, 0x72, 0x63, 0x34, 0x2d, 0x30, 0x30, 0x30, 0x30, 0x35,
> +0x2d, 0x67, 0x37, 0x32, 0x37, 0x63, 0x33, 0x66, 0x33, 0x32, 0x35, 0x39,
> +0x2d, 0x64, 0x69, 0x72, 0x74, 0x79, 0x00, 0x31, 0x30, 0x2f, 0x30, 0x31,
> +0x2f, 0x32, 0x30, 0x32, 0x31, 0x00, 0x00, 0x01, 0x1b, 0x01, 0x00, 0x01,
> +0x02, 0x00, 0x03, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, 0x38, 0x00,
> +0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x55, 0x6e,
> +0x6b, 0x6e, 0x6f, 0x77, 0x6e, 0x00, 0x55, 0x6e, 0x6b, 0x6e, 0x6f, 0x77,
> +0x6e, 0x20, 0x50, 0x72, 0x6f, 0x64, 0x75, 0x63, 0x74, 0x00, 0x31, 0x32,
> +0x33, 0x34, 0x35, 0x36, 0x37, 0x38, 0x00, 0x00, 0x02, 0x0e, 0x02, 0x00,
> +0x01, 0x02, 0x00, 0x04, 0x03, 0x01, 0x01, 0x01, 0x00, 0x0a, 0x55, 0x6e,
> +0x6b, 0x6e, 0x6f, 0x77, 0x6e, 0x00, 0x55, 0x6e, 0x6b, 0x6e, 0x6f, 0x77,
> +0x6e, 0x20, 0x50, 0x72, 0x6f, 0x64, 0x75, 0x63, 0x74, 0x00, 0x33, 0x33,
> +0x33, 0x33, 0x33, 0x33, 0x33, 0x33, 0x00, 0x31, 0x32, 0x33, 0x34, 0x35,
> +0x36, 0x37, 0x38, 0x00, 0x00, 0x03, 0x15, 0x03, 0x00, 0x01, 0x03, 0x00,
> +0x02, 0x03, 0x03, 0x03, 0x03, 0x03, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
> +0x00, 0x00, 0x55, 0x6e, 0x6b, 0x6e, 0x6f, 0x77, 0x6e, 0x00, 0x31, 0x32,
> +0x33, 0x34, 0x35, 0x36, 0x37, 0x38, 0x00, 0x33, 0x33, 0x33, 0x33, 0x33,
> +0x33, 0x33, 0x33, 0x00, 0x00, 0x04, 0x30, 0x04, 0x00, 0x00, 0x03, 0x02,
> +0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x0c, 0x00,
> +0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x06, 0xff, 0xff, 0xff, 0xff, 0xff,
> +0xff, 0x02, 0x03, 0x04, 0x04, 0x04, 0x08, 0x00, 0x00, 0x02, 0x00, 0x08,
> +0x00, 0x08, 0x00, 0x01, 0x00, 0x55, 0x6e, 0x6b, 0x6e, 0x6f, 0x77, 0x6e,
> +0x00, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, 0x38, 0x00, 0x33, 0x33,
> +0x33, 0x33, 0x33, 0x33, 0x33, 0x33, 0x00, 0x35, 0x35, 0x35, 0x35, 0x35,
> +0x35, 0x35, 0x35, 0x00, 0x00, 0x20, 0x0b, 0x05, 0x00, 0x00, 0x00, 0x00,
> +0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x7f, 0x04, 0x06, 0x00, 0x00, 0x00
> };
>
> #define IDX_ARRAY_SZ 3 /* support 24 PCRs */
> @@ -179,10 +178,10 @@ static u8 expected_pcrs[EFI_TCG2_MAX_PCR_INDEX + 1][TPM2_SHA256_DIGEST_SIZE] = {
> 0x7b, 0xb9, 0xfe, 0xa1, 0xcd, 0x64, 0x49, 0xdd,
> 0xed, 0xe2, 0x65, 0x82, 0xc5, 0x3e, 0xf4, 0xc4},
>
> - {0xf5, 0x79, 0xf3, 0x20, 0x62, 0x6e, 0x8b, 0x58,
> - 0x62, 0xa3, 0x4e, 0x2f, 0xb7, 0x10, 0xac, 0x34,
> - 0x4e, 0x68, 0x94, 0x37, 0x87, 0x29, 0xc4, 0xbe,
> - 0xa3, 0xc4, 0xd9, 0x14, 0x2b, 0x66, 0x79, 0x9b},
> + {0x75, 0xb5, 0x91, 0x54, 0x12, 0xa8, 0xa4, 0x25,
> + 0x73, 0x79, 0xa7, 0x47, 0xd9, 0x32, 0x54, 0x78,
> + 0x9a, 0x80, 0x3f, 0xa8, 0x34, 0xfe, 0xd2, 0xae,
> + 0x76, 0xd3, 0x16, 0x4a, 0xb2, 0x03, 0xac, 0xe6},
>
> {0x3d, 0x45, 0x8c, 0xfe, 0x55, 0xcc, 0x03, 0xea,
> 0x1f, 0x44, 0x3f, 0x15, 0x62, 0xbe, 0xec, 0x8d,
> @@ -543,7 +542,7 @@ static void *find_smbios_table(const struct efi_system_table *systable)
> u32 i;
>
> for (i = 0; i < systable->nr_tables; i++) {
> - if (!guidcmp(&smbios_guid, &systable->tables[i].guid))
> + if (!guidcmp(&smbios3_guid, &systable->tables[i].guid))
> return systable->tables[i].table;
> }
>
> @@ -558,14 +557,12 @@ static void *find_smbios_table(const struct efi_system_table *systable)
> */
> static efi_status_t setup_smbios_table(const struct efi_system_table *systable)
> {
> - struct smbios_entry *se;
> + struct smbios3_entry *se;
> efi_status_t ret;
> /* Map within the low 32 bits, to allow for 32bit SMBIOS tables */
> void *dmi;
> - char *istart;
> - int isize;
>
> - if (sizeof(smbios_table_test) > EFI_PAGE_SIZE)
> + if (sizeof(smbios3_table_test) > EFI_PAGE_SIZE)
> return EFI_OUT_OF_RESOURCES;
>
> orig_smbios_table = find_smbios_table(systable);
> @@ -586,19 +583,15 @@ static efi_status_t setup_smbios_table(const struct efi_system_table *systable)
>
> dmi = (void *)(uintptr_t)dmi_addr;
> se = dmi;
> - boottime->copy_mem(se, smbios_table_test, sizeof(smbios_table_test));
> + boottime->copy_mem(se, smbios3_table_test, sizeof(smbios3_table_test));
>
> /* update smbios table start address */
> - se->struct_table_address = (uintptr_t)((u8 *)dmi + SMBIOS_ENTRY_HEADER_SIZE);
> + se->struct_table_address = (uintptr_t)((u8 *)dmi + SMBIOS3_ENTRY_HEADER_SIZE);
>
> - /* calculate checksums */
> - istart = (char *)se + SMBIOS_INTERMEDIATE_OFFSET;
> - isize = sizeof(struct smbios_entry) - SMBIOS_INTERMEDIATE_OFFSET;
> - se->intermediate_checksum = table_compute_checksum(istart, isize);
> - se->checksum = table_compute_checksum(se, sizeof(struct smbios_entry));
> + se->checksum = table_compute_checksum(se, sizeof(struct smbios3_entry));
>
> /* Install SMBIOS information as configuration table */
> - ret = boottime->install_configuration_table(&smbios_guid, dmi);
> + ret = boottime->install_configuration_table(&smbios3_guid, dmi);
> if (ret != EFI_SUCCESS) {
> efi_st_error("Cannot install SMBIOS table\n");
> boottime->free_pages(dmi_addr, 1);
> @@ -992,7 +985,7 @@ static int efi_st_tcg2_teardown(void)
> * If orig_smbios_table is NULL, calling install_configuration_table()
> * removes dummy SMBIOS table form systab.
> */
> - r = boottime->install_configuration_table(&smbios_guid, orig_smbios_table);
> + r = boottime->install_configuration_table(&smbios3_guid, orig_smbios_table);
> if (r != EFI_SUCCESS) {
> efi_st_error("Failed to restore SMBOIS table\n");
> return EFI_ST_FAILURE;
> diff --git a/lib/smbios-parser.c b/lib/smbios-parser.c
> index ac9a367a87..f48d743657 100644
> --- a/lib/smbios-parser.c
> +++ b/lib/smbios-parser.c
> @@ -223,21 +223,24 @@ static void clear_smbios_table(struct smbios_header *header,
> }
> }
>
> -void smbios_prepare_measurement(const struct smbios_entry *entry,
> +void smbios_prepare_measurement(const struct smbios3_entry *entry,
> struct smbios_header *smbios_copy)
> {
> u32 i, j;
> + void *table_end;
> struct smbios_header *header;
>
> + table_end = (void *)((u8 *)smbios_copy + entry->max_struct_size);
> +
> for (i = 0; i < ARRAY_SIZE(smbios_filter_tables); i++) {
> header = smbios_copy;
> - for (j = 0; j < entry->struct_count; j++) {
> + for (j = 0; (void *)header < table_end; j++) {
> if (header->type == smbios_filter_tables[i].type)
> break;
>
> header = get_next_header(header);
> }
> - if (j >= entry->struct_count)
> + if ((void *)header >= table_end)
> continue;
>
> clear_smbios_table(header,
> --
> 2.34.1
>
Reviewed-by: Ilias Apalodimas <ilias.apalodimas at linaro.org>
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