at 2:01 AM, Peter Zijlstra <peterz@xxxxxxxxxxxxx> wrote:
> On Sun, Sep 02, 2018 at 10:32:22AM -0700, Nadav Amit wrote:
>> +void __init poking_init(void)
>> +{
>> + unsigned long poking_addr;
>> +
>> + poking_mm = copy_init_mm();
>> + if (!poking_mm) {
>> + pr_err("x86/mm: error setting a separate poking address space");
>> + return;
>> + }
>> +
>> + /*
>> + * Randomize the poking address, but make sure that the following page
>> + * will be mapped at the same PMD. We need 2 pages, so find space for 3,
>> + * and adjust the address if the PMD ends after the first one.
>> + */
>> + poking_addr = TASK_UNMAPPED_BASE +
>> + (kaslr_get_random_long("Poking") & PAGE_MASK) %
>> + (TASK_SIZE - TASK_UNMAPPED_BASE - 3 * PAGE_SIZE);
>> +
>> + if (((poking_addr + PAGE_SIZE) & ~PMD_MASK) == 0)
>> + poking_addr += PAGE_SIZE;
>> +}
>
> This fails to compile for me.. I don't have kaslr_get_random_long().
Will be fixed in v3. Thanks.
