On Sun, Mar 1, 2015 at 12:29 PM, Borislav Petkov <bp@xxxxxxx> wrote:
> On Sun, Mar 01, 2015 at 12:24:08PM -0800, Yinghai Lu wrote:
>> static allocation in misc.c can not be used to kernel/head_64.S stage safely.
>
> Correct. One possibility that works is sticking it right below
> LOAD_PHYSICAL_ADDR:
>
> +static void add_kaslr_setup_data(struct boot_params *params,
> + u8 *output, __u8 enabled)
> {
> + /*
> + * Stick it right under LOAD_PHYSICAL_ADDR
> + */
> + ksd = (struct setup_data *)(output - 2 * sizeof(struct setup_data));
>
> output is LOAD_PHYSICAL_ADDR AFAICT and is the minimum kASLR considers
> so right below it should work:
Does not look safe yet...
Let me think about it more.
Thanks
Yinghai
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