efi_random_alloc() demands EFI_ALLOCATE_ADDRESS when allocate_pages(), but the current implement can not ensure the selected target locates inside free area, that is to exclude EFI_BOOT_SERVICES_*, EFI_RUNTIME_SERVICES_* etc. Fix the issue by checking md->type. Signed-off-by: Pingfan Liu <piliu@xxxxxxxxxx> Cc: Ard Biesheuvel <ardb@xxxxxxxxxx> To: linux-efi@xxxxxxxxxxxxxxx --- drivers/firmware/efi/libstub/randomalloc.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/drivers/firmware/efi/libstub/randomalloc.c b/drivers/firmware/efi/libstub/randomalloc.c index c41e7b2091cdd..7304e767688f2 100644 --- a/drivers/firmware/efi/libstub/randomalloc.c +++ b/drivers/firmware/efi/libstub/randomalloc.c @@ -79,6 +79,8 @@ efi_status_t efi_random_alloc(unsigned long size, efi_memory_desc_t *md = (void *)map->map + map_offset; unsigned long slots; + if (!(md->type & (EFI_CONVENTIONAL_MEMORY || EFI_PERSISTENT_MEMORY))) + continue; slots = get_entry_num_slots(md, size, ilog2(align), alloc_min, alloc_max); MD_NUM_SLOTS(md) = slots; @@ -111,6 +113,9 @@ efi_status_t efi_random_alloc(unsigned long size, efi_physical_addr_t target; unsigned long pages; + if (!(md->type & (EFI_CONVENTIONAL_MEMORY || EFI_PERSISTENT_MEMORY))) + continue; + if (total_mirrored_slots > 0 && !(md->attribute & EFI_MEMORY_MORE_RELIABLE)) continue; -- 2.41.0
