[PATCH v4 0/4] Enhance Measured Boot
This patch series add the following measurement mandated in the TCG PC Client PFP Specification. - SMBIOS tables - GPT disk partition topology - AuditMode and Deployed mode
Masahisa Kojima (4): efi_loader: add SMBIOS table measurement efi_loader: add UEFI GPT measurement efi_loader: simplify tcg2_measure_secure_boot_variable() efi_loader: add DeployedMode and AuditMode variable measurement
include/blk.h | 3 + include/efi_loader.h | 5 +- include/efi_tcg2.h | 27 +++ include/smbios.h | 17 +- lib/efi_loader/Kconfig | 1 + lib/efi_loader/efi_boottime.c | 4 +- lib/efi_loader/efi_device_path.c | 27 +++ lib/efi_loader/efi_smbios.c | 2 - lib/efi_loader/efi_tcg2.c | 309 ++++++++++++++++++++++++++----- lib/smbios-parser.c | 152 ++++++++++++++- 10 files changed, 487 insertions(+), 60 deletions(-)
TCG PC Client Platform Firmware Profile Specification requires to measure the SMBIOS table that contains static configuration information (e.g. Platform Manufacturer Enterprise Number assigned by IANA, platform model number, Vendor and Device IDs for each SMBIOS table).
The device- and environment-dependent information such as serial number is cleared to zero or space character for the measurement.
Existing smbios_string() function returns pointer to the string with const qualifier, but exisintg use case is updating version string and const qualifier must be removed. This commit removes const qualifier from smbios_string() return value and reuses to clear the strings for the measurement.
This commit also fixes the following compiler warning:
lib/smbios-parser.c:59:39: warning: cast to pointer from integer of different size [-Wint-to-pointer-cast] const struct smbios_header *header = (struct smbios_header *)entry->struct_table_address;
Signed-off-by: Masahisa Kojima masahisa.kojima@linaro.org --- Changes in v4: - update commit message
Changes in v3: - TCG spec says EV_SEPARATOR must be the last, swap the order of measurement
Changes in v2: - use flexible array for table_entry field - modify funtion name to find_smbios_table() - remove unnecessary const qualifier from smbios_string() - create non-const version of next_header()
include/efi_loader.h | 2 + include/efi_tcg2.h | 15 ++++ include/smbios.h | 17 +++- lib/efi_loader/Kconfig | 1 + lib/efi_loader/efi_boottime.c | 2 + lib/efi_loader/efi_smbios.c | 2 - lib/efi_loader/efi_tcg2.c | 84 +++++++++++++++++++ lib/smbios-parser.c | 152 +++++++++++++++++++++++++++++++--- 8 files changed, 261 insertions(+), 14 deletions(-)
diff --git a/include/efi_loader.h b/include/efi_loader.h index f6d65a6c0c..d0433ea52e 100644 --- a/include/efi_loader.h +++ b/include/efi_loader.h @@ -308,6 +308,8 @@ extern const efi_guid_t efi_guid_capsule_report; extern const efi_guid_t efi_guid_firmware_management_protocol; /* GUID for the ESRT */ extern const efi_guid_t efi_esrt_guid; +/* GUID of the SMBIOS table */ +extern const efi_guid_t smbios_guid;
extern char __efi_runtime_start[], __efi_runtime_stop[]; extern char __efi_runtime_rel_start[], __efi_runtime_rel_stop[]; diff --git a/include/efi_tcg2.h b/include/efi_tcg2.h index 8f02d4fb0b..ca66695b39 100644 --- a/include/efi_tcg2.h +++ b/include/efi_tcg2.h @@ -210,6 +210,21 @@ struct efi_tcg2_uefi_variable_data { u8 variable_data[1]; };
+/** + * struct tdUEFI_HANDOFF_TABLE_POINTERS2 - event log structure of SMBOIS tables + * @table_description_size: size of table description + * @table_description: table description + * @number_of_tables: number of uefi configuration table + * @table_entry: uefi configuration table entry + */ +#define SMBIOS_HANDOFF_TABLE_DESC "SmbiosTable" +struct smbios_handoff_table_pointers2 { + u8 table_description_size; + u8 table_description[sizeof(SMBIOS_HANDOFF_TABLE_DESC)]; + u64 number_of_tables; + struct efi_configuration_table table_entry[]; +} __packed; + struct efi_tcg2_protocol { efi_status_t (EFIAPI * get_capability)(struct efi_tcg2_protocol *this, struct efi_tcg2_boot_service_capability *capability); diff --git a/include/smbios.h b/include/smbios.h index aa6b6f3849..acfcbfe2ca 100644 --- a/include/smbios.h +++ b/include/smbios.h @@ -260,9 +260,9 @@ const struct smbios_header *smbios_header(const struct smbios_entry *entry, int * * @header: pointer to struct smbios_header * @index: string index - * @return: NULL or a valid const char pointer + * @return: NULL or a valid char pointer */ -const char *smbios_string(const struct smbios_header *header, int index); +char *smbios_string(const struct smbios_header *header, int index);
/** * smbios_update_version() - Update the version string @@ -292,4 +292,17 @@ int smbios_update_version(const char *version); */ int smbios_update_version_full(void *smbios_tab, const char *version);
+/** + * smbios_prepare_measurement() - Update smbios table for the measurement + * + * TCG specification requires to measure static configuration information. + * This function clear the device dependent parameters such as + * serial number for the measurement. + * + * @entry: pointer to a struct smbios_entry + * @header: pointer to a struct smbios_header + */ +void smbios_prepare_measurement(const struct smbios_entry *entry, + struct smbios_header *header); + #endif /* _SMBIOS_H_ */ diff --git a/lib/efi_loader/Kconfig b/lib/efi_loader/Kconfig index 06633e90a1..52f71c07c9 100644 --- a/lib/efi_loader/Kconfig +++ b/lib/efi_loader/Kconfig @@ -312,6 +312,7 @@ config EFI_TCG2_PROTOCOL select SHA384 select SHA512 select HASH + select SMBIOS_PARSER help Provide a EFI_TCG2_PROTOCOL implementation using the TPM hardware of the platform. diff --git a/lib/efi_loader/efi_boottime.c b/lib/efi_loader/efi_boottime.c index 352c2db25a..973134b12d 100644 --- a/lib/efi_loader/efi_boottime.c +++ b/lib/efi_loader/efi_boottime.c @@ -86,6 +86,8 @@ const efi_guid_t efi_guid_event_group_reset_system = /* GUIDs of the Load File and Load File2 protocols */ const efi_guid_t efi_guid_load_file_protocol = EFI_LOAD_FILE_PROTOCOL_GUID; const efi_guid_t efi_guid_load_file2_protocol = EFI_LOAD_FILE2_PROTOCOL_GUID; +/* GUID of the SMBIOS table */ +const efi_guid_t smbios_guid = SMBIOS_TABLE_GUID;
static efi_status_t EFIAPI efi_disconnect_controller( efi_handle_t controller_handle, diff --git a/lib/efi_loader/efi_smbios.c b/lib/efi_loader/efi_smbios.c index 2eb4cb1c1a..fc0b23397c 100644 --- a/lib/efi_loader/efi_smbios.c +++ b/lib/efi_loader/efi_smbios.c @@ -13,8 +13,6 @@ #include <mapmem.h> #include <smbios.h>
-static const efi_guid_t smbios_guid = SMBIOS_TABLE_GUID; - /* * Install the SMBIOS table as a configuration table. * diff --git a/lib/efi_loader/efi_tcg2.c b/lib/efi_loader/efi_tcg2.c index b6f8f9923d..da589d0197 100644 --- a/lib/efi_loader/efi_tcg2.c +++ b/lib/efi_loader/efi_tcg2.c @@ -15,6 +15,7 @@ #include <efi_tcg2.h> #include <log.h> #include <malloc.h> +#include <smbios.h> #include <version_string.h> #include <tpm-v2.h> #include <u-boot/hash-checksum.h> @@ -1452,6 +1453,81 @@ error: return ret; }
+/** + * tcg2_measure_smbios() - measure smbios table + * + * @dev: TPM device + * @entry: pointer to the smbios_entry structure + * + * Return: status code + */ +static efi_status_t +tcg2_measure_smbios(struct udevice *dev, + const struct smbios_entry *entry) +{ + efi_status_t ret; + struct smbios_header *smbios_copy; + struct smbios_handoff_table_pointers2 *event = NULL; + u32 event_size; + + /* + * TCG PC Client PFP Spec says + * "SMBIOS structures that contain static configuration information + * (e.g. Platform Manufacturer Enterprise Number assigned by IANA, + * platform model number, Vendor and Device IDs for each SMBIOS table) + * that is relevant to the security of the platform MUST be measured". + * Device dependent parameters such as serial number are cleared to + * zero or spaces for the measurement. + */ + event_size = sizeof(struct smbios_handoff_table_pointers2) + + FIELD_SIZEOF(struct efi_configuration_table, guid) + + entry->struct_table_length; + event = calloc(1, event_size); + if (!event) { + ret = EFI_OUT_OF_RESOURCES; + goto out; + } + + event->table_description_size = sizeof(SMBIOS_HANDOFF_TABLE_DESC); + 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); + 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); + + smbios_prepare_measurement(entry, smbios_copy); + + ret = tcg2_measure_event(dev, 1, EV_EFI_HANDOFF_TABLES2, event_size, + (u8 *)event); + if (ret != EFI_SUCCESS) + goto out; + +out: + free(event); + + return ret; +} + +/** + * find_smbios_table() - find smbios table + * + * Return: pointer to the smbios table + */ +static void *find_smbios_table(void) +{ + u32 i; + + for (i = 0; i < systab.nr_tables; i++) { + if (!guidcmp(&smbios_guid, &systab.tables[i].guid)) + return systab.tables[i].table; + } + + return NULL; +} + /** * efi_tcg2_measure_efi_app_invocation() - measure efi app invocation * @@ -1463,6 +1539,7 @@ efi_status_t efi_tcg2_measure_efi_app_invocation(void) u32 pcr_index; struct udevice *dev; u32 event = 0; + struct smbios_entry *entry;
if (tcg2_efi_app_invoked) return EFI_SUCCESS; @@ -1481,6 +1558,13 @@ efi_status_t efi_tcg2_measure_efi_app_invocation(void) if (ret != EFI_SUCCESS) goto out;
+ entry = (struct smbios_entry *)find_smbios_table(); + if (entry) { + ret = tcg2_measure_smbios(dev, entry); + 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); diff --git a/lib/smbios-parser.c b/lib/smbios-parser.c index 34203f952c..2b9392936b 100644 --- a/lib/smbios-parser.c +++ b/lib/smbios-parser.c @@ -39,10 +39,8 @@ const struct smbios_entry *smbios_entry(u64 address, u32 size) return entry; }
-static const struct smbios_header *next_header(const struct smbios_header *curr) +static u8 *find_next_header(u8 *pos) { - u8 *pos = ((u8 *)curr) + curr->length; - /* search for _double_ NULL bytes */ while (!((*pos == 0) && (*(pos + 1) == 0))) pos++; @@ -50,13 +48,27 @@ static const struct smbios_header *next_header(const struct smbios_header *curr) /* step behind the double NULL bytes */ pos += 2;
- return (struct smbios_header *)pos; + return pos; +} + +static struct smbios_header *get_next_header(struct smbios_header *curr) +{ + u8 *pos = ((u8 *)curr) + curr->length; + + return (struct smbios_header *)find_next_header(pos); +} + +static const struct smbios_header *next_header(const struct smbios_header *curr) +{ + u8 *pos = ((u8 *)curr) + curr->length; + + return (struct smbios_header *)find_next_header(pos); }
const struct smbios_header *smbios_header(const struct smbios_entry *entry, int type) { const unsigned int num_header = entry->struct_count; - const struct smbios_header *header = (struct smbios_header *)entry->struct_table_address; + const struct smbios_header *header = (struct smbios_header *)((uintptr_t)entry->struct_table_address);
for (unsigned int i = 0; i < num_header; i++) { if (header->type == type) @@ -68,8 +80,8 @@ const struct smbios_header *smbios_header(const struct smbios_entry *entry, int return NULL; }
-static const char *string_from_smbios_table(const struct smbios_header *header, - int idx) +static char *string_from_smbios_table(const struct smbios_header *header, + int idx) { unsigned int i = 1; u8 *pos; @@ -86,10 +98,10 @@ static const char *string_from_smbios_table(const struct smbios_header *header, pos++; }
- return (const char *)pos; + return (char *)pos; }
-const char *smbios_string(const struct smbios_header *header, int index) +char *smbios_string(const struct smbios_header *header, int index) { if (!header) return NULL; @@ -109,7 +121,7 @@ int smbios_update_version_full(void *smbios_tab, const char *version) if (!hdr) return log_msg_ret("tab", -ENOENT); bios = (struct smbios_type0 *)hdr; - ptr = (char *)smbios_string(hdr, bios->bios_ver); + ptr = smbios_string(hdr, bios->bios_ver); if (!ptr) return log_msg_ret("str", -ENOMEDIUM);
@@ -132,3 +144,123 @@ int smbios_update_version_full(void *smbios_tab, const char *version)
return 0; } + +struct smbios_filter_param { + u32 offset; + u32 size; + bool is_string; +}; + +struct smbios_filter_table { + int type; + struct smbios_filter_param *params; + u32 count; +}; + +struct smbios_filter_param smbios_type1_filter_params[] = { + {offsetof(struct smbios_type1, serial_number), + FIELD_SIZEOF(struct smbios_type1, serial_number), true}, + {offsetof(struct smbios_type1, uuid), + FIELD_SIZEOF(struct smbios_type1, uuid), false}, + {offsetof(struct smbios_type1, wakeup_type), + FIELD_SIZEOF(struct smbios_type1, wakeup_type), false}, +}; + +struct smbios_filter_param smbios_type2_filter_params[] = { + {offsetof(struct smbios_type2, serial_number), + FIELD_SIZEOF(struct smbios_type2, serial_number), true}, + {offsetof(struct smbios_type2, chassis_location), + FIELD_SIZEOF(struct smbios_type2, chassis_location), false}, +}; + +struct smbios_filter_param smbios_type3_filter_params[] = { + {offsetof(struct smbios_type3, serial_number), + FIELD_SIZEOF(struct smbios_type3, serial_number), true}, + {offsetof(struct smbios_type3, asset_tag_number), + FIELD_SIZEOF(struct smbios_type3, asset_tag_number), true}, +}; + +struct smbios_filter_param smbios_type4_filter_params[] = { + {offsetof(struct smbios_type4, serial_number), + FIELD_SIZEOF(struct smbios_type4, serial_number), true}, + {offsetof(struct smbios_type4, asset_tag), + FIELD_SIZEOF(struct smbios_type4, asset_tag), true}, + {offsetof(struct smbios_type4, part_number), + FIELD_SIZEOF(struct smbios_type4, part_number), true}, + {offsetof(struct smbios_type4, core_count), + FIELD_SIZEOF(struct smbios_type4, core_count), false}, + {offsetof(struct smbios_type4, core_enabled), + FIELD_SIZEOF(struct smbios_type4, core_enabled), false}, + {offsetof(struct smbios_type4, thread_count), + FIELD_SIZEOF(struct smbios_type4, thread_count), false}, + {offsetof(struct smbios_type4, core_count2), + FIELD_SIZEOF(struct smbios_type4, core_count2), false}, + {offsetof(struct smbios_type4, core_enabled2), + FIELD_SIZEOF(struct smbios_type4, core_enabled2), false}, + {offsetof(struct smbios_type4, thread_count2), + FIELD_SIZEOF(struct smbios_type4, thread_count2), false}, + {offsetof(struct smbios_type4, voltage), + FIELD_SIZEOF(struct smbios_type4, voltage), false}, +}; + +struct smbios_filter_table smbios_filter_tables[] = { + {SMBIOS_SYSTEM_INFORMATION, smbios_type1_filter_params, + ARRAY_SIZE(smbios_type1_filter_params)}, + {SMBIOS_BOARD_INFORMATION, smbios_type2_filter_params, + ARRAY_SIZE(smbios_type2_filter_params)}, + {SMBIOS_SYSTEM_ENCLOSURE, smbios_type3_filter_params, + ARRAY_SIZE(smbios_type3_filter_params)}, + {SMBIOS_PROCESSOR_INFORMATION, smbios_type4_filter_params, + ARRAY_SIZE(smbios_type4_filter_params)}, +}; + +static void clear_smbios_table(struct smbios_header *header, + struct smbios_filter_param *filter, + u32 count) +{ + u32 i; + char *str; + u8 string_id; + + for (i = 0; i < count; i++) { + if (filter[i].is_string) { + string_id = *((u8 *)header + filter[i].offset); + if (string_id == 0) /* string is empty */ + continue; + + str = smbios_string(header, string_id); + if (!str) + continue; + + /* string is cleared to space, keep '\0' terminator */ + memset(str, ' ', strlen(str)); + + } else { + memset((void *)((u8 *)header + filter[i].offset), + 0, filter[i].size); + } + } +} + +void smbios_prepare_measurement(const struct smbios_entry *entry, + struct smbios_header *smbios_copy) +{ + u32 i, j; + struct smbios_header *header; + + for (i = 0; i < ARRAY_SIZE(smbios_filter_tables); i++) { + header = smbios_copy; + for (j = 0; j < entry->struct_count; j++) { + if (header->type == smbios_filter_tables[i].type) + break; + + header = get_next_header(header); + } + if (j >= entry->struct_count) + continue; + + clear_smbios_table(header, + smbios_filter_tables[i].params, + smbios_filter_tables[i].count); + } +}
Hi Masahisa,
On Tue, 26 Oct 2021 at 02:26, Masahisa Kojima masahisa.kojima@linaro.org wrote:
TCG PC Client Platform Firmware Profile Specification requires to measure the SMBIOS table that contains static configuration information (e.g. Platform Manufacturer Enterprise Number assigned by IANA, platform model number, Vendor and Device IDs for each SMBIOS table).
The device- and environment-dependent information such as serial number is cleared to zero or space character for the measurement.
Existing smbios_string() function returns pointer to the string with const qualifier, but exisintg use case is updating version string and const qualifier must be removed. This commit removes const qualifier from smbios_string() return value and reuses to clear the strings for the measurement.
This commit also fixes the following compiler warning:
lib/smbios-parser.c:59:39: warning: cast to pointer from integer of different size [-Wint-to-pointer-cast] const struct smbios_header *header = (struct smbios_header *)entry->struct_table_address;
Signed-off-by: Masahisa Kojima masahisa.kojima@linaro.org
Changes in v4:
- update commit message
Changes in v3:
- TCG spec says EV_SEPARATOR must be the last, swap the order of measurement
Changes in v2:
- use flexible array for table_entry field
- modify funtion name to find_smbios_table()
- remove unnecessary const qualifier from smbios_string()
- create non-const version of next_header()
include/efi_loader.h | 2 + include/efi_tcg2.h | 15 ++++ include/smbios.h | 17 +++- lib/efi_loader/Kconfig | 1 + lib/efi_loader/efi_boottime.c | 2 + lib/efi_loader/efi_smbios.c | 2 - lib/efi_loader/efi_tcg2.c | 84 +++++++++++++++++++ lib/smbios-parser.c | 152 +++++++++++++++++++++++++++++++--- 8 files changed, 261 insertions(+), 14 deletions(-)
I don't understand what efi_system_table is. Could someone add a comment about that to the code?
Also efi_configuration_table is an array of void * to what? Again I don't see any comment in the header file...
How does this match up with the SMBIOS table already in U-Boot? Is it a pointer to it?
Regards, Simon
Hi Simon,
On Tue, 2 Nov 2021 at 23:56, Simon Glass sjg@chromium.org wrote:
Hi Masahisa,
On Tue, 26 Oct 2021 at 02:26, Masahisa Kojima masahisa.kojima@linaro.org wrote:
TCG PC Client Platform Firmware Profile Specification requires to measure the SMBIOS table that contains static configuration information (e.g. Platform Manufacturer Enterprise Number assigned by IANA, platform model number, Vendor and Device IDs for each SMBIOS table).
The device- and environment-dependent information such as serial number is cleared to zero or space character for the measurement.
Existing smbios_string() function returns pointer to the string with const qualifier, but exisintg use case is updating version string and const qualifier must be removed. This commit removes const qualifier from smbios_string() return value and reuses to clear the strings for the measurement.
This commit also fixes the following compiler warning:
lib/smbios-parser.c:59:39: warning: cast to pointer from integer of different size [-Wint-to-pointer-cast] const struct smbios_header *header = (struct smbios_header *)entry->struct_table_address;
Signed-off-by: Masahisa Kojima masahisa.kojima@linaro.org
Changes in v4:
- update commit message
Changes in v3:
- TCG spec says EV_SEPARATOR must be the last, swap the order of measurement
Changes in v2:
- use flexible array for table_entry field
- modify funtion name to find_smbios_table()
- remove unnecessary const qualifier from smbios_string()
- create non-const version of next_header()
include/efi_loader.h | 2 + include/efi_tcg2.h | 15 ++++ include/smbios.h | 17 +++- lib/efi_loader/Kconfig | 1 + lib/efi_loader/efi_boottime.c | 2 + lib/efi_loader/efi_smbios.c | 2 - lib/efi_loader/efi_tcg2.c | 84 +++++++++++++++++++ lib/smbios-parser.c | 152 +++++++++++++++++++++++++++++++--- 8 files changed, 261 insertions(+), 14 deletions(-)
I don't understand what efi_system_table is. Could someone add a comment about that to the code?
efi_system_table is defined in the UEFI Specification.
Also efi_configuration_table is an array of void * to what? Again I don't see any comment in the header file...
It is also defined in the UEFI Specification.
typedef struct{ EFI_GUID VendorGuid; VOID *VendorTable; } EFI_CONFIGURATION_TABLE;
efi_configuration_table will contain the guid and pointer to the industry standard configuration tables such as APCI and SMBIOS.
How does this match up with the SMBIOS table already in U-Boot? Is it a pointer to it?
efi_system_table has array of efi_configuration_table, SMBIOS tables is installed(saving pointer into the array of efi_configuration_table together with guid) by calling efi_install_configuration_table().
Thanks, Masahisa Kojima
Regards, Simon
Hi Masahisa,
On Wed, 3 Nov 2021 at 19:16, Masahisa Kojima masahisa.kojima@linaro.org wrote:
Hi Simon,
On Tue, 2 Nov 2021 at 23:56, Simon Glass sjg@chromium.org wrote:
Hi Masahisa,
On Tue, 26 Oct 2021 at 02:26, Masahisa Kojima masahisa.kojima@linaro.org wrote:
TCG PC Client Platform Firmware Profile Specification requires to measure the SMBIOS table that contains static configuration information (e.g. Platform Manufacturer Enterprise Number assigned by IANA, platform model number, Vendor and Device IDs for each SMBIOS table).
The device- and environment-dependent information such as serial number is cleared to zero or space character for the measurement.
Existing smbios_string() function returns pointer to the string with const qualifier, but exisintg use case is updating version string and const qualifier must be removed. This commit removes const qualifier from smbios_string() return value and reuses to clear the strings for the measurement.
This commit also fixes the following compiler warning:
lib/smbios-parser.c:59:39: warning: cast to pointer from integer of different size [-Wint-to-pointer-cast] const struct smbios_header *header = (struct smbios_header *)entry->struct_table_address;
Signed-off-by: Masahisa Kojima masahisa.kojima@linaro.org
Changes in v4:
- update commit message
Changes in v3:
- TCG spec says EV_SEPARATOR must be the last, swap the order of measurement
Changes in v2:
- use flexible array for table_entry field
- modify funtion name to find_smbios_table()
- remove unnecessary const qualifier from smbios_string()
- create non-const version of next_header()
include/efi_loader.h | 2 + include/efi_tcg2.h | 15 ++++ include/smbios.h | 17 +++- lib/efi_loader/Kconfig | 1 + lib/efi_loader/efi_boottime.c | 2 + lib/efi_loader/efi_smbios.c | 2 - lib/efi_loader/efi_tcg2.c | 84 +++++++++++++++++++ lib/smbios-parser.c | 152 +++++++++++++++++++++++++++++++--- 8 files changed, 261 insertions(+), 14 deletions(-)
I don't understand what efi_system_table is. Could someone add a comment about that to the code?
efi_system_table is defined in the UEFI Specification.
Also efi_configuration_table is an array of void * to what? Again I don't see any comment in the header file...
It is also defined in the UEFI Specification.
typedef struct{ EFI_GUID VendorGuid; VOID *VendorTable; } EFI_CONFIGURATION_TABLE;
efi_configuration_table will contain the guid and pointer to the industry standard configuration tables such as APCI and SMBIOS.
How does this match up with the SMBIOS table already in U-Boot? Is it a pointer to it?
efi_system_table has array of efi_configuration_table, SMBIOS tables is installed(saving pointer into the array of efi_configuration_table together with guid) by calling efi_install_configuration_table().
OK thank you. So while you are here could you add a patch to add comments to this obtuse code? The specification is a mile long and the poor punters need to be able to figure out what is going on, particularly with void pointers.
Reviewed-by: Simon Glass sjg@chromium.org
Regards, Simon
Hi Simon,
On Thu, 4 Nov 2021 at 11:49, Simon Glass sjg@chromium.org wrote:
Hi Masahisa,
On Wed, 3 Nov 2021 at 19:16, Masahisa Kojima masahisa.kojima@linaro.org wrote:
Hi Simon,
On Tue, 2 Nov 2021 at 23:56, Simon Glass sjg@chromium.org wrote:
Hi Masahisa,
On Tue, 26 Oct 2021 at 02:26, Masahisa Kojima masahisa.kojima@linaro.org wrote:
TCG PC Client Platform Firmware Profile Specification requires to measure the SMBIOS table that contains static configuration information (e.g. Platform Manufacturer Enterprise Number assigned by IANA, platform model number, Vendor and Device IDs for each SMBIOS table).
The device- and environment-dependent information such as serial number is cleared to zero or space character for the measurement.
Existing smbios_string() function returns pointer to the string with const qualifier, but exisintg use case is updating version string and const qualifier must be removed. This commit removes const qualifier from smbios_string() return value and reuses to clear the strings for the measurement.
This commit also fixes the following compiler warning:
lib/smbios-parser.c:59:39: warning: cast to pointer from integer of different size [-Wint-to-pointer-cast] const struct smbios_header *header = (struct smbios_header *)entry->struct_table_address;
Signed-off-by: Masahisa Kojima masahisa.kojima@linaro.org
Changes in v4:
- update commit message
Changes in v3:
- TCG spec says EV_SEPARATOR must be the last, swap the order of measurement
Changes in v2:
- use flexible array for table_entry field
- modify funtion name to find_smbios_table()
- remove unnecessary const qualifier from smbios_string()
- create non-const version of next_header()
include/efi_loader.h | 2 + include/efi_tcg2.h | 15 ++++ include/smbios.h | 17 +++- lib/efi_loader/Kconfig | 1 + lib/efi_loader/efi_boottime.c | 2 + lib/efi_loader/efi_smbios.c | 2 - lib/efi_loader/efi_tcg2.c | 84 +++++++++++++++++++ lib/smbios-parser.c | 152 +++++++++++++++++++++++++++++++--- 8 files changed, 261 insertions(+), 14 deletions(-)
I don't understand what efi_system_table is. Could someone add a comment about that to the code?
efi_system_table is defined in the UEFI Specification.
Also efi_configuration_table is an array of void * to what? Again I don't see any comment in the header file...
It is also defined in the UEFI Specification.
typedef struct{ EFI_GUID VendorGuid; VOID *VendorTable; } EFI_CONFIGURATION_TABLE;
efi_configuration_table will contain the guid and pointer to the industry standard configuration tables such as APCI and SMBIOS.
How does this match up with the SMBIOS table already in U-Boot? Is it a pointer to it?
efi_system_table has array of efi_configuration_table, SMBIOS tables is installed(saving pointer into the array of efi_configuration_table together with guid) by calling efi_install_configuration_table().
OK thank you. So while you are here could you add a patch to add comments to this obtuse code? The specification is a mile long and the poor punters need to be able to figure out what is going on, particularly with void pointers.
Reviewed-by: Simon Glass sjg@chromium.org
Thank you for your review.
OK, I will add the comment for the struct efi_configuration_table and struct efi_system_table.
Thanks, Masahisa Kojima
Thanks, Masahisa Kojima
Regards, Simon
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 --- Changes in v4: - update commit message - return EFI_SUCCESS if device path is NULL - use memalign()
Changes in v3: - EV_EFI_GPT_EVENT is measured before EV_SEPARATOR, same as other PCRs - use PTR_ARRAY instead of ARRAY - create sub-function of allocating io_aligned buffer - move search_gpt_dp_node() into efi_device_path.c
include/blk.h | 3 + include/efi_loader.h | 3 +- include/efi_tcg2.h | 12 +++ lib/efi_loader/efi_boottime.c | 2 +- lib/efi_loader/efi_device_path.c | 27 ++++++ lib/efi_loader/efi_tcg2.c | 146 ++++++++++++++++++++++++++++++- 6 files changed, 190 insertions(+), 3 deletions(-)
diff --git a/include/blk.h b/include/blk.h index 19bab081c2..f0cc7ca1a2 100644 --- a/include/blk.h +++ b/include/blk.h @@ -45,6 +45,9 @@ enum if_type { #define BLK_PRD_SIZE 20 #define BLK_REV_SIZE 8
+#define PART_FORMAT_PCAT 0x1 +#define PART_FORMAT_GPT 0x2 + /* * Identifies the partition table type (ie. MBR vs GPT GUID) signature */ diff --git a/include/efi_loader.h b/include/efi_loader.h index d0433ea52e..d52e399841 100644 --- a/include/efi_loader.h +++ b/include/efi_loader.h @@ -503,7 +503,7 @@ efi_status_t efi_init_variables(void); void efi_variables_boot_exit_notify(void); efi_status_t efi_tcg2_notify_exit_boot_services_failed(void); /* Measure efi application invocation */ -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); /* Measure efi application exit */ efi_status_t efi_tcg2_measure_efi_app_exit(void); /* Called by bootefi to initialize root node */ @@ -847,6 +847,7 @@ struct efi_device_path *efi_dp_from_lo(struct efi_load_option *lo, const efi_guid_t *guid); struct efi_device_path *efi_dp_concat(const struct efi_device_path *dp1, const struct efi_device_path *dp2); +struct efi_device_path *search_gpt_dp_node(struct efi_device_path *device_path); efi_status_t efi_deserialize_load_option(struct efi_load_option *lo, u8 *data, efi_uintn_t *size); unsigned long efi_serialize_load_option(struct efi_load_option *lo, u8 **data); diff --git a/include/efi_tcg2.h b/include/efi_tcg2.h index ca66695b39..50a59f9263 100644 --- a/include/efi_tcg2.h +++ b/include/efi_tcg2.h @@ -225,6 +225,18 @@ struct smbios_handoff_table_pointers2 { struct efi_configuration_table table_entry[]; } __packed;
+/** + * struct tdUEFI_GPT_DATA - event log structure of industry standard tables + * @uefi_partition_header: gpt partition header + * @number_of_partitions: the number of partition + * @partitions: partition entries + */ +struct efi_gpt_data { + gpt_header uefi_partition_header; + u64 number_of_partitions; + gpt_entry partitions[]; +} __packed; + struct efi_tcg2_protocol { efi_status_t (EFIAPI * get_capability)(struct efi_tcg2_protocol *this, struct efi_tcg2_boot_service_capability *capability); diff --git a/lib/efi_loader/efi_boottime.c b/lib/efi_loader/efi_boottime.c index 973134b12d..1823990d9b 100644 --- a/lib/efi_loader/efi_boottime.c +++ b/lib/efi_loader/efi_boottime.c @@ -3004,7 +3004,7 @@ efi_status_t EFIAPI efi_start_image(efi_handle_t image_handle,
if (IS_ENABLED(CONFIG_EFI_TCG2_PROTOCOL)) { if (image_obj->image_type == IMAGE_SUBSYSTEM_EFI_APPLICATION) { - ret = efi_tcg2_measure_efi_app_invocation(); + ret = efi_tcg2_measure_efi_app_invocation(image_obj); if (ret != EFI_SUCCESS) { log_warning("tcg2 measurement fails(0x%lx)\n", ret); diff --git a/lib/efi_loader/efi_device_path.c b/lib/efi_loader/efi_device_path.c index c04439d16d..735ed0bd0f 100644 --- a/lib/efi_loader/efi_device_path.c +++ b/lib/efi_loader/efi_device_path.c @@ -1239,3 +1239,30 @@ efi_device_path *efi_dp_from_lo(struct efi_load_option *lo,
return NULL; } + +/** + * search_gpt_dp_node() - search gpt device path node + * + * @device_path: device path + * + * Return: pointer to the gpt device path node + */ +struct efi_device_path *search_gpt_dp_node(struct efi_device_path *device_path) +{ + struct efi_device_path *dp = device_path; + + while (dp) { + if (dp->type == DEVICE_PATH_TYPE_MEDIA_DEVICE && + dp->sub_type == DEVICE_PATH_SUB_TYPE_HARD_DRIVE_PATH) { + struct efi_device_path_hard_drive_path *hd_dp = + (struct efi_device_path_hard_drive_path *)dp; + + if (hd_dp->partmap_type == PART_FORMAT_GPT && + hd_dp->signature_type == SIG_TYPE_GUID) + return dp; + } + dp = efi_dp_next(dp); + } + + return NULL; +} diff --git a/lib/efi_loader/efi_tcg2.c b/lib/efi_loader/efi_tcg2.c index da589d0197..377b138855 100644 --- a/lib/efi_loader/efi_tcg2.c +++ b/lib/efi_loader/efi_tcg2.c @@ -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; + efi_guid_t null_guid = NULL_GUID; + gpt_header *gpt_h; + gpt_entry *entry; + 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);
On 10/26/21 10:27, Masahisa Kojima wrote:
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
Changes in v4:
- update commit message
- return EFI_SUCCESS if device path is NULL
- use memalign()
Changes in v3:
EV_EFI_GPT_EVENT is measured before EV_SEPARATOR, same as other PCRs
use PTR_ARRAY instead of ARRAY
create sub-function of allocating io_aligned buffer
move search_gpt_dp_node() into efi_device_path.c
include/blk.h | 3 + include/efi_loader.h | 3 +- include/efi_tcg2.h | 12 +++ lib/efi_loader/efi_boottime.c | 2 +- lib/efi_loader/efi_device_path.c | 27 ++++++ lib/efi_loader/efi_tcg2.c | 146 ++++++++++++++++++++++++++++++- 6 files changed, 190 insertions(+), 3 deletions(-)
diff --git a/include/blk.h b/include/blk.h index 19bab081c2..f0cc7ca1a2 100644 --- a/include/blk.h +++ b/include/blk.h @@ -45,6 +45,9 @@ enum if_type { #define BLK_PRD_SIZE 20 #define BLK_REV_SIZE 8
+#define PART_FORMAT_PCAT 0x1 +#define PART_FORMAT_GPT 0x2
- /*
*/
- Identifies the partition table type (ie. MBR vs GPT GUID) signature
diff --git a/include/efi_loader.h b/include/efi_loader.h index d0433ea52e..d52e399841 100644 --- a/include/efi_loader.h +++ b/include/efi_loader.h @@ -503,7 +503,7 @@ efi_status_t efi_init_variables(void); void efi_variables_boot_exit_notify(void); efi_status_t efi_tcg2_notify_exit_boot_services_failed(void); /* Measure efi application invocation */ -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); /* Measure efi application exit */ efi_status_t efi_tcg2_measure_efi_app_exit(void); /* Called by bootefi to initialize root node */ @@ -847,6 +847,7 @@ struct efi_device_path *efi_dp_from_lo(struct efi_load_option *lo, const efi_guid_t *guid); struct efi_device_path *efi_dp_concat(const struct efi_device_path *dp1, const struct efi_device_path *dp2); +struct efi_device_path *search_gpt_dp_node(struct efi_device_path *device_path); efi_status_t efi_deserialize_load_option(struct efi_load_option *lo, u8 *data, efi_uintn_t *size); unsigned long efi_serialize_load_option(struct efi_load_option *lo, u8 **data); diff --git a/include/efi_tcg2.h b/include/efi_tcg2.h index ca66695b39..50a59f9263 100644 --- a/include/efi_tcg2.h +++ b/include/efi_tcg2.h @@ -225,6 +225,18 @@ struct smbios_handoff_table_pointers2 { struct efi_configuration_table table_entry[]; } __packed;
+/**
- struct tdUEFI_GPT_DATA - event log structure of industry standard tables
- @uefi_partition_header: gpt partition header
- @number_of_partitions: the number of partition
- @partitions: partition entries
- */
+struct efi_gpt_data {
- gpt_header uefi_partition_header;
- u64 number_of_partitions;
- gpt_entry partitions[];
+} __packed;
- struct efi_tcg2_protocol { efi_status_t (EFIAPI * get_capability)(struct efi_tcg2_protocol *this, struct efi_tcg2_boot_service_capability *capability);
diff --git a/lib/efi_loader/efi_boottime.c b/lib/efi_loader/efi_boottime.c index 973134b12d..1823990d9b 100644 --- a/lib/efi_loader/efi_boottime.c +++ b/lib/efi_loader/efi_boottime.c @@ -3004,7 +3004,7 @@ efi_status_t EFIAPI efi_start_image(efi_handle_t image_handle,
if (IS_ENABLED(CONFIG_EFI_TCG2_PROTOCOL)) { if (image_obj->image_type == IMAGE_SUBSYSTEM_EFI_APPLICATION) {
ret = efi_tcg2_measure_efi_app_invocation();
ret = efi_tcg2_measure_efi_app_invocation(image_obj); if (ret != EFI_SUCCESS) { log_warning("tcg2 measurement fails(0x%lx)\n", ret);diff --git a/lib/efi_loader/efi_device_path.c b/lib/efi_loader/efi_device_path.c index c04439d16d..735ed0bd0f 100644 --- a/lib/efi_loader/efi_device_path.c +++ b/lib/efi_loader/efi_device_path.c @@ -1239,3 +1239,30 @@ efi_device_path *efi_dp_from_lo(struct efi_load_option *lo,
return NULL; }
+/**
- search_gpt_dp_node() - search gpt device path node
- @device_path: device path
- Return: pointer to the gpt device path node
- */
+struct efi_device_path *search_gpt_dp_node(struct efi_device_path *device_path) +{
- struct efi_device_path *dp = device_path;
- while (dp) {
if (dp->type == DEVICE_PATH_TYPE_MEDIA_DEVICE &&dp->sub_type == DEVICE_PATH_SUB_TYPE_HARD_DRIVE_PATH) {struct efi_device_path_hard_drive_path *hd_dp =(struct efi_device_path_hard_drive_path *)dp;if (hd_dp->partmap_type == PART_FORMAT_GPT &&hd_dp->signature_type == SIG_TYPE_GUID)return dp;}dp = efi_dp_next(dp);- }
- return NULL;
+} diff --git a/lib/efi_loader/efi_tcg2.c b/lib/efi_loader/efi_tcg2.c index da589d0197..377b138855 100644 --- a/lib/efi_loader/efi_tcg2.c +++ b/lib/efi_loader/efi_tcg2.c @@ -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;
- efi_guid_t null_guid = NULL_GUID;
- gpt_header *gpt_h;
- gpt_entry *entry;
This must be
gpt_entry *entry = NULL;
to avoid freeing an undefined pointer on sandbox_defconfig, cf. https://source.denx.de/u-boot/custodians/u-boot-efi/-/jobs/341558
Best regards
Heinrich
- 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);
This commit simplifies tcg2_measure_secure_boot_variable() using secure_variables table.
Signed-off-by: Masahisa Kojima masahisa.kojima@linaro.org --- Newly added in v4
lib/efi_loader/efi_tcg2.c | 60 ++++++++++++--------------------------- 1 file changed, 18 insertions(+), 42 deletions(-)
diff --git a/lib/efi_loader/efi_tcg2.c b/lib/efi_loader/efi_tcg2.c index 377b138855..6545ec9e79 100644 --- a/lib/efi_loader/efi_tcg2.c +++ b/lib/efi_loader/efi_tcg2.c @@ -81,12 +81,19 @@ static const struct digest_info hash_algo_list[] = { }, };
-static const u16 *secure_variables[] = { - u"SecureBoot", - u"PK", - u"KEK", - u"db", - u"dbx", +struct variable_info { + const u16 *name; + bool accept_empty; +}; + +static struct variable_info secure_variables[] = { + {u"SecureBoot", true}, + {u"PK", true}, + {u"KEK", true}, + {u"db", true}, + {u"dbx", true}, + {u"dbt", false}, + {u"dbr", false}, };
#define MAX_HASH_COUNT ARRAY_SIZE(hash_algo_list) @@ -1820,52 +1827,21 @@ static efi_status_t tcg2_measure_secure_boot_variable(struct udevice *dev) for (i = 0; i < count; i++) { const efi_guid_t *guid;
- guid = efi_auth_var_get_guid(secure_variables[i]); + guid = efi_auth_var_get_guid(secure_variables[i].name);
- /* - * According to the TCG2 PC Client PFP spec, "SecureBoot", - * "PK", "KEK", "db" and "dbx" variables must be measured - * even if they are empty. - */ - data = efi_get_var(secure_variables[i], guid, &data_size); + data = efi_get_var(secure_variables[i].name, guid, &data_size); + if (!data && !secure_variables[i].accept_empty) + continue;
ret = tcg2_measure_variable(dev, 7, EV_EFI_VARIABLE_DRIVER_CONFIG, - secure_variables[i], guid, + secure_variables[i].name, guid, data_size, data); free(data); if (ret != EFI_SUCCESS) goto error; }
- /* - * TCG2 PC Client PFP spec says "dbt" and "dbr" are - * measured if present and not empty. - */ - data = efi_get_var(L"dbt", - &efi_guid_image_security_database, - &data_size); - if (data) { - ret = tcg2_measure_variable(dev, 7, - EV_EFI_VARIABLE_DRIVER_CONFIG, - L"dbt", - &efi_guid_image_security_database, - data_size, data); - free(data); - } - - data = efi_get_var(L"dbr", - &efi_guid_image_security_database, - &data_size); - if (data) { - ret = tcg2_measure_variable(dev, 7, - EV_EFI_VARIABLE_DRIVER_CONFIG, - L"dbr", - &efi_guid_image_security_database, - data_size, data); - free(data); - } - error: return ret; }
This commit adds the DeployedMode and AuditMode variable measurement required in TCG PC Client Platform Firmware Profile Specification.
Signed-off-by: Masahisa Kojima masahisa.kojima@linaro.org --- Changes in v4: - use table and loop - update commit message
Changes in v3: - read variable first, then mesure the variable
lib/efi_loader/efi_tcg2.c | 33 +++++++++++++++++++++++++-------- 1 file changed, 25 insertions(+), 8 deletions(-)
diff --git a/lib/efi_loader/efi_tcg2.c b/lib/efi_loader/efi_tcg2.c index 6545ec9e79..6f0f36394a 100644 --- a/lib/efi_loader/efi_tcg2.c +++ b/lib/efi_loader/efi_tcg2.c @@ -84,16 +84,19 @@ static const struct digest_info hash_algo_list[] = { struct variable_info { const u16 *name; bool accept_empty; + u32 pcr_index; };
static struct variable_info secure_variables[] = { - {u"SecureBoot", true}, - {u"PK", true}, - {u"KEK", true}, - {u"db", true}, - {u"dbx", true}, - {u"dbt", false}, - {u"dbr", false}, + {u"SecureBoot", true, 7}, + {u"PK", true, 7}, + {u"KEK", true, 7}, + {u"db", true, 7}, + {u"dbx", true, 7}, + {u"dbt", false, 7}, + {u"dbr", false, 7}, + {u"DeployedMode", false, 1}, + {u"AuditMode", false, 1}, };
#define MAX_HASH_COUNT ARRAY_SIZE(hash_algo_list) @@ -1822,6 +1825,15 @@ static efi_status_t tcg2_measure_secure_boot_variable(struct udevice *dev) efi_uintn_t data_size; u32 count, i; efi_status_t ret; + u8 deployed_mode; + efi_uintn_t size; + u32 deployed_audit_pcr_index = 1; + + size = sizeof(deployed_mode); + ret = efi_get_variable_int(u"DeployedMode", &efi_global_variable_guid, + NULL, &size, &deployed_mode, NULL); + if (ret != EFI_SUCCESS || !deployed_mode) + deployed_audit_pcr_index = 7;
count = ARRAY_SIZE(secure_variables); for (i = 0; i < count; i++) { @@ -1833,7 +1845,12 @@ static efi_status_t tcg2_measure_secure_boot_variable(struct udevice *dev) if (!data && !secure_variables[i].accept_empty) continue;
- ret = tcg2_measure_variable(dev, 7, + if (u16_strcmp(u"DeployedMode", secure_variables[i].name)) + secure_variables[i].pcr_index = deployed_audit_pcr_index; + if (u16_strcmp(u"AuditMode", secure_variables[i].name)) + secure_variables[i].pcr_index = deployed_audit_pcr_index; + + ret = tcg2_measure_variable(dev, secure_variables[i].pcr_index, EV_EFI_VARIABLE_DRIVER_CONFIG, secure_variables[i].name, guid, data_size, data);
participants (3)
-
Heinrich Schuchardt -
Masahisa Kojima -
Simon Glass