Re: [PATCH] arm64: kaslr: Reserve size of ARM64_MEMSTART_ALIGN in linear region

[Yueyi Li]

Hi Ard,


On 2018/12/24 17:45, Ard Biesheuvel wrote:
> Does the following change fix your issue as well?
>
> index 9b432d9fcada..9dcf0ff75a11 100644
> --- a/arch/arm64/mm/init.c
> +++ b/arch/arm64/mm/init.c
> @@ -447,7 +447,7 @@ void __init arm64_memblock_init(void)
>                   * memory spans, randomize the linear region as well.
>                   */
>                  if (memstart_offset_seed > 0 && range >= ARM64_MEMSTART_ALIGN) {
> -                       range = range / ARM64_MEMSTART_ALIGN + 1;
> +                       range /= ARM64_MEMSTART_ALIGN;
>                          memstart_addr -= ARM64_MEMSTART_ALIGN *
>                                           ((range * memstart_offset_seed) >> 16);
>                  }

Yes, it can fix this also. I just think modify the first *range* 
calculation would be easier to
  grasp, what do you think?



Thanks,
Yueyi