Re: [PATCH v2] efi_loader: migrate SMBIOS 3.0 entry point structure for measurement

On 1/26/24 01:53, Masahisa Kojima 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@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);
  

  lib/efi_loader/efi_helper.c smbios_prepare_measurement(entry, smbios_copy);

@@ -1133,7 +1138,7 @@ static void *find_smbios_table(void)

This function contains redundant code. We should replace it in a future patch. See efi_loader: export efi_get_configuration_table https://lists.denx.de/pipermail/u-boot/2024-January/544516.html

Reviewed-by: Heinrich Schuchardt xypron.glpk@gmx.de

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,