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

Rik van Riel
2009-05-23T22:42:24Z

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.

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