[PATCH] efi_loader: migrate SMBIOS 3.0 entry point structure for measurement
Masahisa Kojima
masahisa.kojima at linaro.org
Thu Jan 25 00:57:31 CET 2024
Hi Heinrich,
On Wed, 24 Jan 2024 at 22:54, Heinrich Schuchardt <xypron.glpk at gmx.de> wrote:
>
> On 24.01.24 12:51, Masahisa Kojima wrote:
> > Hi Heinrich,
> >
> > On Wed, 24 Jan 2024 at 18:29, Heinrich Schuchardt <xypron.glpk at gmx.de> wrote:
> >>
> >> On 1/24/24 10:15, 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 at linaro.org>
> >>
> >> Hello Maasahisa,
> >>
> >> Thank you for looking into this.
> >>
> >> SMBIOS tables may be provided by QEMU. Depending on the architecture and
> >> the QEMU release we will see SMBIOS2.1 and SMBIOS3 tables. We should
> >> support measuring for both.
> >
> > With this commit, I assume that only SMBIOS 3.0 is supported in an EFI
> > enabled system.
> > # Sorry but I don't fully follow the recent SMBIOS discussion in U-Boot ML.
> >
> > commit aa8499680c14afa80ed731b4cfcd6934b4f93712
> > "efi: smbios: Drop support for SMBIOS2 tables"
> >
> > If QEMU provides the SMBIOS 2.1 tables, do we need to revert the above patch?
>
> qemu-x86_defconfig receives a SMBIOS 2.1 table from QEMU 8.2.
>
> But in qfw_parse_smbios_anchor() we translate this to SMBIOS 3.0. So it
> seems my worries concerning QEMU were unjustified.
Thank you for confirming it.
>
> I still wonder why in smbios_prepare_measurement() we don't check that
> the SMBIOS header has the expected signature ('_SM3_').
I will add anchor string checking.
Thanks,
Masahisa Kojima
>
> Best regards
>
> Heinrich
> >>
> >>> ---
> >>> include/efi_loader.h | 1 +
> >>> include/smbios.h | 4 +-
> >>> lib/efi_loader/efi_tcg2.c | 14 ++--
> >>> lib/efi_selftest/efi_selftest_tcg2.c | 97 +++++++++++++---------------
> >>> lib/smbios-parser.c | 9 ++-
> >>> 5 files changed, 61 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..8b4f2fd2da 100644
> >>> --- a/lib/efi_loader/efi_tcg2.c
> >>> +++ b/lib/efi_loader/efi_tcg2.c
> >>> @@ -1075,7 +1075,7 @@ 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;
> >>> @@ -1093,7 +1093,7 @@ 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 +1104,11 @@ 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 +1133,7 @@ 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 +1360,7 @@ 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 +1382,7 @@ 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,
> >>
>
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