>>> On 02.03.18 at 16:43, <jgr...@suse.com> wrote:
> On 02/03/18 15:35, Jan Beulich wrote:
>> --- a/xen/arch/x86/mm.c
>> +++ b/xen/arch/x86/mm.c
>> @@ -5576,6 +5576,14 @@ void memguard_unguard_stack(void *p)
>> STACK_SIZE - PRIMARY_STACK_SIZE - IST_MAX *
>> PAGE_SIZE);
>> }
>>
>> +bool memguard_is_stack_guard_page(unsigned long addr)
>> +{
>> + addr &= STACK_SIZE - 1;
>> +
>> + return addr >= IST_MAX * PAGE_SIZE &&
>> + addr < STACK_SIZE - PRIMARY_STACK_SIZE;
>> +}
>> +
>
> What about making use of memguard_is_stack_guard_page() in
> memguard_[un]guard_stack() ?
I was considering this as a follow-up step.
> This would at once ensure the other unused
> pages won't be accessed accidentally somewhere.
I don't understand this part, though.
Jan
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