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efi_loader: Fix relocations above 64kb image size

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We were truncating the image offset within the target image to 16 bits
which again meant that we were potentially overwriting random memory
in the lower 16 bits of the image.

This patch casts the offset to a more reasonable 32bits.

With this applied, I can successfully see Shell.efi assert because it
can't find a protocol it expects to be available.

Signed-off-by: Alexander Graf <agraf@suse.de>
This commit is contained in:
Alexander Graf 2016-08-18 23:45:18 +02:00 committed by Tom Rini
parent 68a2fd4357
commit b1237c6e8a
1 changed files with 1 additions and 1 deletions
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lib/efi_loader/efi_image_loader.c
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@ -37,7 +37,7 @@ static void efi_loader_relocate(const IMAGE_BASE_RELOCATION *rel,
const uint16_t *relocs = (const uint16_t *)(rel + 1);
i = (rel->SizeOfBlock - sizeof(*rel)) / sizeof(uint16_t);
while (i--) {
uint16_t offset = (*relocs & 0xfff) +
uint32_t offset = (uint32_t)(*relocs & 0xfff) +
rel->VirtualAddress;
int type = *relocs >> EFI_PAGE_SHIFT;
unsigned long delta = (unsigned long)efi_reloc;