AllocatePages() can be called with Type=AllocateAddress. Such a call can only succeed if *Memory points to the address of an unallocated page range.
A call with *Memory being an address that is not page aligned must not succeed. The UEFI specification requires returning EFI_OUT_OF_RESOURCES if the requested pages cannot be allocated.
Signed-off-by: Heinrich Schuchardt heinrich.schuchardt@canonical.com --- lib/efi_loader/efi_memory.c | 2 ++ 1 file changed, 2 insertions(+)
diff --git a/lib/efi_loader/efi_memory.c b/lib/efi_loader/efi_memory.c index e048a545e4..a17b426d11 100644 --- a/lib/efi_loader/efi_memory.c +++ b/lib/efi_loader/efi_memory.c @@ -483,6 +483,8 @@ efi_status_t efi_allocate_pages(enum efi_allocate_type type, return EFI_OUT_OF_RESOURCES; break; case EFI_ALLOCATE_ADDRESS: + if (*memory & EFI_PAGE_MASK) + return EFI_NOT_FOUND; /* Exact address, reserve it. The addr is already in *memory. */ ret = efi_check_allocated(*memory, false); if (ret != EFI_SUCCESS)