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efi_loader: AllocateAdress error handling

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If AllocatePages() is called with AllocateAddress, the UEFI spec requires
to return EFI_NOT_FOUND in case the memory page does not exist.

The UEFI SCT II 2017 spec additionally requires to return EFI_NOT_FOUND if
the page is already allocated.

Check that *Memory refers to an unallocated page.

UEFI SCT II (2017): AllocatePages(), 5.1.2.1.9 - 5.1.2.1.10

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
This commit is contained in:
Heinrich Schuchardt 2019-05-11 08:21:17 +02:00
parent 735fd22800
commit f756fe83b0
1 changed files with 13 additions and 6 deletions
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19
lib/efi_loader/efi_memory.c
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@ -330,10 +330,11 @@ uint64_t efi_add_memory_map(uint64_t start, uint64_t pages, int memory_type,
* Page alignment is not checked as this is not a requirement of
* efi_free_pool().
*
* @addr: address of page to be freed
* Return: status code
* @addr: address of page to be freed
* @must_be_allocated: return success if the page is allocated
* Return: status code
*/
static efi_status_t efi_check_allocated(u64 addr)
static efi_status_t efi_check_allocated(u64 addr, bool must_be_allocated)
{
struct efi_mem_list *item;
@ -344,7 +345,8 @@ static efi_status_t efi_check_allocated(u64 addr)
u64 end = start + (item->desc.num_pages << EFI_PAGE_SHIFT);
if (addr >= start && addr < end) {
if (item->desc.type != EFI_CONVENTIONAL_MEMORY)
if (must_be_allocated ^
(item->desc.type == EFI_CONVENTIONAL_MEMORY))
return EFI_SUCCESS;
else
return EFI_NOT_FOUND;
@ -438,6 +440,11 @@ efi_status_t efi_allocate_pages(int type, int memory_type,
break;
case EFI_ALLOCATE_ADDRESS:
/* Exact address, reserve it. The addr is already in *memory. */
r = efi_check_allocated(*memory, false);
if (r != EFI_SUCCESS) {
r = EFI_NOT_FOUND;
break;
}
addr = *memory;
break;
default:
@ -488,7 +495,7 @@ efi_status_t efi_free_pages(uint64_t memory, efi_uintn_t pages)
uint64_t r = 0;
efi_status_t ret;
ret = efi_check_allocated(memory);
ret = efi_check_allocated(memory, true);
if (ret != EFI_SUCCESS)
return ret;
@ -555,7 +562,7 @@ efi_status_t efi_free_pool(void *buffer)
efi_status_t ret;
struct efi_pool_allocation *alloc;
ret = efi_check_allocated((uintptr_t)buffer);
ret = efi_check_allocated((uintptr_t)buffer, true);
if (ret != EFI_SUCCESS)
return ret;