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efi_selftest: check system table pointer

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Enhance the debug support unit test.

Acked-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>
Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
This commit is contained in:
Heinrich Schuchardt
2025-07-04 16:22:12 +02:00
parent 62b3dbfc5e
commit b9bb2627bb
1 changed files with 67 additions and 1 deletions
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68
lib/efi_selftest/efi_selftest_debug_support.c
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@@ -9,6 +9,7 @@
#include <efi_loader.h>
#include <efi_selftest.h>
#include <linux/sizes.h>
/**
* efi_st_debug_support_execute() - execute test
@@ -21,6 +22,12 @@ static int efi_st_debug_support_execute(void)
{
struct efi_debug_image_info_table_header *efi_st_debug_info_table_header = NULL;
efi_guid_t efi_debug_image_info_table_guid = EFI_DEBUG_IMAGE_INFO_TABLE_GUID;
struct efi_mem_desc *memory_map;
efi_uintn_t map_size = 0;
efi_uintn_t map_key;
efi_uintn_t desc_size;
u32 desc_version;
efi_status_t ret;
/* get EFI_DEBUG_IMAGE_INFO_TABLE */
efi_st_debug_info_table_header = efi_st_get_config_table(&efi_debug_image_info_table_guid);
@@ -30,7 +37,66 @@ static int efi_st_debug_support_execute(void)
return EFI_ST_FAILURE;
}
return EFI_ST_SUCCESS;
/* Load memory map */
ret = st_boottime->get_memory_map(&map_size, NULL, &map_key, &desc_size,
&desc_version);
if (ret != EFI_BUFFER_TOO_SMALL) {
efi_st_error
("GetMemoryMap did not return EFI_BUFFER_TOO_SMALL\n");
return EFI_ST_FAILURE;
}
/* Allocate extra space for newly allocated memory */
map_size += sizeof(struct efi_mem_desc);
ret = st_boottime->allocate_pool(EFI_BOOT_SERVICES_DATA, map_size,
(void **)&memory_map);
if (ret != EFI_SUCCESS) {
efi_st_error("AllocatePool failed\n");
return EFI_ST_FAILURE;
}
ret = st_boottime->get_memory_map(&map_size, memory_map, &map_key,
&desc_size, &desc_version);
if (ret != EFI_SUCCESS) {
efi_st_error("GetMemoryMap failed\n");
return EFI_ST_FAILURE;
}
/* Find the system table pointer */
for (efi_uintn_t i = 0; map_size; ++i, map_size -= desc_size) {
struct efi_mem_desc *entry = &memory_map[i];
u64 end;
if (entry->type != EFI_RUNTIME_SERVICES_DATA)
continue;
end = entry->physical_start +
(entry->num_pages << EFI_PAGE_SHIFT);
for (u64 pos = ALIGN(entry->physical_start, SZ_4M);
pos <= end; pos += SZ_4M) {
struct efi_system_table_pointer *systab_pointer =
(void *)(uintptr_t)pos;
/* check for overflow */
if (pos < entry->physical_start)
break;
if (systab_pointer->signature ==
EFI_SYSTEM_TABLE_SIGNATURE) {
if (systab_pointer->efi_system_table_base !=
(uintptr_t)st_systable) {
efi_st_error("Wrong system table address\n");
ret = EFI_ST_FAILURE;
goto out;
}
ret = EFI_ST_SUCCESS;
goto out;
}
}
}
efi_st_error("System table pointer not found\n");
ret = EFI_ST_FAILURE;
out:
st_boottime->free_pool(memory_map);
return ret;
}
EFI_UNIT_TEST(debug_support) = {