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efi/libstub: Synchronize instruction cache after kernel relocation

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The relocated kernel image is copied to its new location using memcpy().
On architectures with separate instruction and data caches, the copied
instructions may remain stale in the instruction cache, leading to the
execution of outdated contents.

Call efi_cache_sync_image() after the relocation copy to ensure the
instruction cache is synchronized with the updated memory contents before
control is transferred to the relocated kernel.

Signed-off-by: WANG Rui <r@hev.cc>
Reviewed-by: Huacai Chen <chenhuacai@loongson.cn>
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
This commit is contained in:
WANG Rui
2026-04-27 16:47:21 +08:00
committed by Ard Biesheuvel
parent ad6f4f3ea7
commit cda92ac47c
1 changed files with 1 additions and 0 deletions
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drivers/firmware/efi/libstub/loongarch-stub.c
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@@ -86,6 +86,7 @@ efi_status_t efi_relocate_kernel(unsigned long *image_addr,
* have been allocated by UEFI, so we can safely use memcpy.
*/
memcpy((void *)new_addr, (void *)cur_image_addr, image_size);
efi_cache_sync_image(new_addr, image_size);
/* Return the new address of the relocated image. */
*image_addr = new_addr;