lkml.org 
[lkml]   [2001]   [Nov]   [30]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH] task_struct colouring ...
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


-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2005-03-22 13:13    [W:0.045 / U:1.020 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site