Re: [patch 0/5] Support for sanitization flag in low-level pageallocator

From: Ingo Molnar
Date: Wed May 27 2009 - 18:35:10 EST

* Rik van Riel <riel@xxxxxxxxxx> wrote:

> Ingo Molnar wrote:
>> What you are missing is that your patch makes _no technical
>> sense_ if you allow the same information to leak over the kernel
>> stack. Kernel stacks can be freed and reused, swapped out and
>> thus 'exposed'.
> Kernel stacks may be freed and reused, but Larry's latest patch
> takes care of that by clearing them at page free time.
> As for being swapped out - I do not believe that kernel stacks can
> ever be swapped out in Linux.

yes, i referred to that as an undesirable option - because it slows
down pthread_create() quite substantially.

This needs before/after pthread_create() benchmark results.

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