Messages in this thread |  | | Date | Fri, 30 Nov 2001 17:36:04 -0800 | From | "H. Peter Anvin" <> | Subject | Re: [PATCH] task_struct colouring ... |
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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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