Re: [RFC PATCH 2/3] efi/loongarch: Randomize kernel preferred address for KASLR
Lisa Robinson <[email protected]>
| Newsgroups | org.kernel.vger.linux-efi,dev.linux.lists.loongarch,org.kernel.vger.linux-kernel |
|---|---|
| Message-ID | <[email protected]> |
Hi Rui
> diff --git a/drivers/firmware/efi/libstub/loongarch.c b/drivers/firmware/efi/libstub/loongarch.c
> index 9825f5218137..80ba7d69e1b3 100644
> --- a/drivers/firmware/efi/libstub/loongarch.c
> +++ b/drivers/firmware/efi/libstub/loongarch.c
> @@ -38,6 +38,21 @@ static efi_status_t exit_boot_func(struct efi_boot_memmap *map, void *priv)
> return EFI_SUCCESS;
> }
>
> +unsigned long efi_get_kimg_kaslr_address(void)
> +{
> + unsigned int random_offset = 0;
> +
> +#ifdef CONFIG_RANDOMIZE_BASE
> + if (!efi_nokaslr) {
> + efi_get_random_bytes(sizeof(random_offset), (u8 *)&random_offset);
> + random_offset ^= (rdtime_l() << 16);
random_offset &= ~(efi_get_kimg_min_align() - 1);
> + random_offset &= (CONFIG_RANDOMIZE_BASE_MAX_OFFSET - 1);
> + }
> +#endif
> +
> + return PHYSADDR(VMLINUX_LOAD_ADDRESS) + random_offset;
> +}
> +
> unsigned long __weak kernel_entry_address(unsigned long kernel_addr,
> efi_loaded_image_t *image)
> {
--
Lisa