The EFI spec defines special-purpose memory in ยง7.2. That memory serves as a hint to the OS to avoid allocating this memory for core OS data or code that can not be relocated. So let's ignore it when allocating from conventional memory.
Signed-off-by: Ilias Apalodimas ilias.apalodimas@linaro.org --- lib/efi_loader/efi_memory.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/lib/efi_loader/efi_memory.c b/lib/efi_loader/efi_memory.c index c6f1dd09456e..74732e37f8aa 100644 --- a/lib/efi_loader/efi_memory.c +++ b/lib/efi_loader/efi_memory.c @@ -422,7 +422,8 @@ static efi_status_t efi_check_allocated(u64 addr, bool must_be_allocated)
if (addr >= start && addr < end) { if (must_be_allocated ^ - (item->desc.type == EFI_CONVENTIONAL_MEMORY)) + (item->desc.type == EFI_CONVENTIONAL_MEMORY) && + !(item->desc.attribute & EFI_MEMORY_SP)) return EFI_SUCCESS; else return EFI_NOT_FOUND; @@ -460,6 +461,9 @@ static uint64_t efi_find_free_memory(uint64_t len, uint64_t max_addr) if (desc->type != EFI_CONVENTIONAL_MEMORY) continue;
+ if (desc->attribute & EFI_MEMORY_SP) + continue; + /* Out of bounds for max_addr */ if ((ret + len) > max_addr) continue;