> A type mismatch in the efi_allocate_pool boot service flow causes > hazardous memory scribbling on 32-bit systems. > > This is efi_allocate_pool's prototype: > > static efi_status_t EFIAPI efi_allocate_pool(int pool_type, > unsigned long size, > void **buffer); > > Internally, it invokes efi_allocate_pages as follows: > > efi_allocate_pages(0, pool_type, (size + 0xfff) >> 12, > (void*)buffer); > > This is efi_allocate_pages' prototype: > > efi_status_t efi_allocate_pages(int type, int memory_type, > unsigned long pages, > uint64_t *memory); > > The problem: efi_allocate_pages does this internally: > > *memory = addr; > > This fix in efi_allocate_pool uses a transitional uintptr_t cast to > ensure the correct outcome, irrespective of the system's native word > size. > > This was observed when bootefi'ing the EFI instance of FreeBSD's first > stage bootstrap (boot1.efi) on a 32-bit ARM platform (Qemu VExpress + > Cortex-a9). > > Signed-off-by: Robin Randhawa <robin.randh...@arm.com>
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