Davide Libenzi wrote:
>>
>>This seems to confuddle the idea of colouring the kernel stack.
>>
>
> It's task_truct colouring not stack, to colour the stack you've to go in
> arch/??/kernel/process.c and jitter the stack pointer.
> The task_struct colouring is done at task_struct creation time :
>
> +struct task_struct *alloc_task_struct(void)
> +{
> + unsigned long tskb = __get_free_pages(GFP_KERNEL, 1), tsk;
> + tsk = tskb | ((tskb >> 13) & 0x00000060) | SMP_CACHE_BYTES;
> + *(unsigned long *) tskb = tsk;
> + return (struct task_struct *) tsk;
> +}
>
I know, but I believe the part of the idea was to color not just the
current, but also the stack.
Your idea would make the obvious way to color the kernel stack -- have the
stacks offset by a non-power-of-two -- no longer work.
-hpa
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This archive was generated by hypermail 2b29 : Fri Nov 30 2001 - 21:00:42 EST