Re: [PATCH] arm64: Add support for STACKLEAK gcc plugin

[Kees Cook]

On Wed, Jul 11, 2018 at 6:45 PM, Laura Abbott <labbott@xxxxxxxxxx> wrote:
>> +#ifdef CONFIG_GCC_PLUGIN_STACKLEAK
>> +#define MIN_STACK_LEFT 256
>> +
>> +void __used stackleak_check_alloca(unsigned long size)
>> +{
>> +       unsigned long sp, stack_left;
>> +
>> +       sp = current_stack_pointer;
>> +
>> +       stack_left = sp & (THREAD_SIZE - 1);
>> +       BUG_ON(stack_left < MIN_STACK_LEFT ||
>> +               size >= stack_left - MIN_STACK_LEFT);
>> +}
>> +EXPORT_SYMBOL(stackleak_check_alloca);
>> +#endif
>
>
> I think the conclusion was this needs to be re-written to account
> for the different stack sizes in the same way as x86.

Oh, whoops! Sorry, I missed that fork of the thread. :)

-Kees

-- 
Kees Cook
Pixel Security