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

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

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From: Ingo Molnar

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

Date: Wednesday, May 27, 2009 - 3:34 pm

* Rik van Riel <riel@redhat.com> wrote:

quoted text> 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.

	Ingo
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Messages in current thread:

[patch 0/5] Support for sanitization flag in low-level pag ..., Larry H., (Wed May 20, 11:30 am)

Re: [patch 0/5] Support for sanitization flag in low-level ..., Peter Zijlstra, (Wed May 20, 1:42 pm)

Re: [patch 0/5] Support for sanitization flag in low-level ..., Larry H., (Wed May 20, 2:24 pm)

Re: [patch 0/5] Support for sanitization flag in low-level ..., Robin Holt, (Thu May 21, 8:21 am)

Re: [patch 0/5] Support for sanitization flag in low-level ..., Larry H., (Thu May 21, 11:43 am)

Re: [patch 0/5] Support for sanitization flag in low-level ..., Rik van Riel, (Thu May 21, 12:08 pm)

Re: [patch 0/5] Support for sanitization flag in low-level ..., Alan Cox, (Thu May 21, 12:26 pm)

Re: [patch 0/5] Support for sanitization flag in low-level ..., Larry H., (Thu May 21, 12:56 pm)

Re: [patch 0/5] Support for sanitization flag in low-level ..., Alan Cox, (Thu May 21, 1:47 pm)

Re: [patch 0/5] Support for sanitization flag in low-level ..., Alan Cox, (Thu May 21, 3:47 pm)

Re: [patch 0/5] Support for sanitization flag in low-level ..., Larry H., (Fri May 22, 4:22 am)

Re: [patch 0/5] Support for sanitization flag in low-level ..., Larry H., (Fri May 22, 4:38 am)

Re: [patch 0/5] Support for sanitization flag in low-level ..., Alan Cox, (Fri May 22, 6:37 am)

Re: [patch 0/5] Support for sanitization flag in low-level ..., Alan Cox, (Fri May 22, 6:39 am)

Re: [patch 0/5] Support for sanitization flag in low-level ..., Larry H., (Fri May 22, 11:03 am)

Re: [patch 0/5] Support for sanitization flag in low-level ..., Alan Cox, (Fri May 22, 11:21 am)

Re: [patch 0/5] Support for sanitization flag in low-level ..., Nai Xia, (Fri May 22, 11:37 am)

Re: [patch 0/5] Support for sanitization flag in low-level ..., Nai Xia, (Fri May 22, 12:18 pm)

Re: [patch 0/5] Support for sanitization flag in low-level ..., Alan Cox, (Sat May 23, 1:09 am)

Re: [patch 0/5] Support for sanitization flag in low-level ..., Ingo Molnar, (Sat May 23, 5:49 am)

Re: [patch 0/5] Support for sanitization flag in low-level ..., Arjan van de Ven, (Sat May 23, 8:56 am)

[PATCH] Support for unconditional page sanitization, Larry H., (Sat May 23, 11:21 am)

Re: [PATCH] Support for unconditional page sanitization, Arjan van de Ven, (Sat May 23, 2:05 pm)

Re: [patch 0/5] Support for sanitization flag in low-level ..., Larry H., (Sat May 23, 3:28 pm)

Re: [patch 0/5] Support for sanitization flag in low-level ..., Rik van Riel, (Sat May 23, 3:42 pm)

Re: [PATCH] Support for unconditional page sanitization, pageexec, (Sun May 24, 3:19 am)

Re: [PATCH] Support for unconditional page sanitization, Arjan van de Ven, (Sun May 24, 9:38 am)

[PATCH] Sanitize memory on kfree() and kmem_cache_free(), Larry H., (Sun May 24, 6:17 pm)

Re: [patch 0/5] Support for sanitization flag in low-level ..., Pavel Machek, (Tue May 26, 12:02 pm)

Re: [patch 0/5] Support for sanitization flag in low-level ..., Ingo Molnar, (Wed May 27, 3:34 pm)

Re: [patch 0/5] Support for sanitization flag in low-level ..., Alan Cox, (Wed May 27, 11:27 pm)

Re: [patch 0/5] Support for sanitization flag in low-level ..., Larry H., (Thu May 28, 12:00 am)

Re: [patch 0/5] Support for sanitization flag in low-level ..., Ingo Molnar, (Thu May 28, 2:08 am)

Re: [patch 0/5] Support for sanitization flag in low-level ..., Alan Cox, (Thu May 28, 4:50 am)

Re: [patch 0/5] Support for sanitization flag in low-level ..., Pavel Machek, (Thu May 28, 5:48 am)

Re: [patch 0/5] Support for sanitization flag in low-level ..., Larry H., (Thu May 28, 5:55 am)

Re: [patch 0/5] Support for sanitization flag in low-level ..., pageexec, (Thu May 28, 11:48 am)

Re: [patch 0/5] Support for sanitization flag in low-level ..., Peter Zijlstra, (Thu May 28, 12:36 pm)

Re: [patch 0/5] Support for sanitization flag in low-level ..., Peter Zijlstra, (Thu May 28, 12:44 pm)

Re: [patch 0/5] Support for sanitization flag in low-level ..., Arjan van de Ven, (Fri May 29, 7:32 am)

Re: [patch 0/5] Support for sanitization flag in low-level ..., Andrew Morton, (Fri May 29, 3:58 pm)

Re: [patch 0/5] Support for sanitization flag in low-level ..., Larry H., (Fri May 29, 10:48 pm)

Re: [patch 0/5] Support for sanitization flag in low-level ..., Pekka Enberg, (Sat May 30, 12:12 am)

Re: [patch 0/5] Support for sanitization flag in low-level ..., Larry H., (Sat May 30, 12:35 am)

Re: [patch 0/5] Support for sanitization flag in low-level ..., Pekka Enberg, (Sat May 30, 12:35 am)

Re: [patch 0/5] Support for sanitization flag in low-level ..., Pekka Enberg, (Sat May 30, 12:39 am)

Re: [patch 0/5] Support for sanitization flag in low-level ..., Larry H., (Sat May 30, 12:50 am)

Re: [patch 0/5] Support for sanitization flag in low-level ..., Pekka Enberg, (Sat May 30, 12:53 am)

Re: [patch 0/5] Support for sanitization flag in low-level ..., Pekka Enberg, (Sat May 30, 12:57 am)

Re: [patch 0/5] Support for sanitization flag in low-level ..., Larry H., (Sat May 30, 1:20 am)

Re: [patch 0/5] Support for sanitization flag in low-level ..., Alan Cox, (Sat May 30, 1:31 am)

Re: [patch 0/5] Support for sanitization flag in low-level ..., Pekka Enberg, (Sat May 30, 1:33 am)

Re: [patch 0/5] Support for sanitization flag in low-level ..., Pekka Enberg, (Sat May 30, 1:35 am)

Re: [patch 0/5] Support for sanitization flag in low-level ..., Larry H., (Sat May 30, 2:05 am)

Re: [patch 0/5] Support for sanitization flag in low-level ..., Larry H., (Sat May 30, 2:27 am)

Re: [patch 0/5] Support for sanitization flag in low-level ..., Peter Zijlstra, (Sat May 30, 3:39 am)

Re: [patch 0/5] Support for sanitization flag in low-level ..., Larry H., (Sat May 30, 3:43 am)

Re: [patch 0/5] Support for sanitization flag in low-level ..., pageexec, (Sat May 30, 4:42 am)

Re: [patch 0/5] Support for sanitization flag in low-level ..., Peter Zijlstra, (Sat May 30, 6:21 am)

Re: [patch 0/5] Support for sanitization flag in low-level ..., Peter Zijlstra, (Sat May 30, 6:24 am)

Re: [patch 0/5] Support for sanitization flag in low-level ..., pageexec, (Sat May 30, 6:54 am)

Re: [patch 0/5] Support for sanitization flag in low-level ..., Larry H., (Sat May 30, 7:04 am)

Re: [patch 0/5] Support for sanitization flag in low-level ..., Rik van Riel, (Sat May 30, 7:08 am)

Re: [patch 0/5] Support for sanitization flag in low-level ..., Rik van Riel, (Sat May 30, 7:13 am)

Re: [patch 0/5] Support for sanitization flag in low-level ..., Peter Zijlstra, (Sat May 30, 7:45 am)

Re: [patch 0/5] Support for sanitization flag in low-level ..., Rik van Riel, (Sat May 30, 7:48 am)

Re: [patch 0/5] Support for sanitization flag in low-level ..., Ray Lee, (Sat May 30, 8:05 am)

Re: [patch 0/5] Support for sanitization flag in low-level ..., Larry H., (Sat May 30, 10:00 am)

Re: [patch 0/5] Support for sanitization flag in low-level ..., Larry H., (Sat May 30, 10:25 am)

Re: [patch 0/5] Support for sanitization flag in low-level ..., Ingo Molnar, (Sat May 30, 10:34 am)

Re: [patch 0/5] Support for sanitization flag in low-level ..., Ingo Molnar, (Sat May 30, 10:39 am)

Re: [patch 0/5] Support for sanitization flag in low-level ..., Ingo Molnar, (Sat May 30, 10:46 am)

Re: [patch 0/5] Support for sanitization flag in low-level ..., Ingo Molnar, (Sat May 30, 10:50 am)

Re: [patch 0/5] Support for sanitization flag in low-level ..., Larry H., (Sat May 30, 11:03 am)

Re: [patch 0/5] Support for sanitization flag in low-level ..., Larry H., (Sat May 30, 11:09 am)

Re: [patch 0/5] Support for sanitization flag in low-level ..., Ingo Molnar, (Sat May 30, 11:21 am)

Re: [patch 0/5] Support for sanitization flag in low-level ..., Ingo Molnar, (Sat May 30, 11:32 am)

Re: [patch 0/5] Support for sanitization flag in low-level ..., Larry H., (Sat May 30, 11:45 am)

Re: [patch 0/5] Support for sanitization flag in low-level ..., Ingo Molnar, (Sat May 30, 12:08 pm)

Re: [patch 0/5] Support for sanitization flag in low-level ..., Pekka Enberg, (Sat May 30, 1:22 pm)

Re: [patch 0/5] Support for sanitization flag in low-level ..., Rik van Riel, (Sat May 30, 1:39 pm)

Re: [patch 0/5] Support for sanitization flag in low-level ..., Pekka Enberg, (Sat May 30, 1:53 pm)

Re: [patch 0/5] Support for sanitization flag in low-level ..., Larry H., (Sat May 30, 2:33 pm)

Re: [patch 0/5] Support for sanitization flag in low-level ..., Ingo Molnar, (Sat May 30, 3:10 pm)

Re: [patch 0/5] Support for sanitization flag in low-level ..., Ingo Molnar, (Sat May 30, 3:14 pm)

Re: [patch 0/5] Support for sanitization flag in low-level ..., Alan Cox, (Sat May 30, 4:10 pm)

Re: [patch 0/5] Support for sanitization flag in low-level ..., Alan Cox, (Sat May 30, 4:13 pm)

Re: [patch 0/5] Support for sanitization flag in low-level ..., Alan Cox, (Sat May 30, 4:15 pm)

Re: [patch 0/5] Support for sanitization flag in low-level ..., Larry H., (Sat May 30, 4:18 pm)

Re: [patch 0/5] Support for sanitization flag in low-level ..., Pekka Enberg, (Sat May 30, 11:14 pm)

Re: [patch 0/5] Support for sanitization flag in low-level ..., Pekka Enberg, (Sat May 30, 11:30 pm)

Re: [patch 0/5] Support for sanitization flag in low-level ..., Pekka Enberg, (Sun May 31, 12:17 am)

Re: [patch 0/5] Support for sanitization flag in low-level ..., Pekka Enberg, (Sun May 31, 3:24 am)

Re: [patch 0/5] Support for sanitization flag in low-level ..., Alan Cox, (Sun May 31, 3:24 am)

Re: [patch 0/5] Support for sanitization flag in low-level ..., Larry H., (Sun May 31, 4:49 am)

Re: [patch 0/5] Support for sanitization flag in low-level ..., Larry H., (Sun May 31, 4:58 am)

Re: [patch 0/5] Support for sanitization flag in low-level ..., Larry H., (Sun May 31, 5:16 am)

Re: [patch 0/5] Support for sanitization flag in low-level ..., Pekka Enberg, (Sun May 31, 5:16 am)

Re: [patch 0/5] Support for sanitization flag in low-level ..., Pekka Enberg, (Sun May 31, 5:19 am)

Re: [patch 0/5] Support for sanitization flag in low-level ..., Larry H., (Sun May 31, 5:30 am)

Re: [patch 0/5] Support for sanitization flag in low-level ..., Pekka Enberg, (Sun May 31, 5:35 am)

Re: [patch 0/5] Support for sanitization flag in low-level ..., Arjan van de Ven, (Sun May 31, 7:38 am)

Re: [patch 0/5] Support for sanitization flag in low-level ..., Arjan van de Ven, (Sun May 31, 8:03 am)

Re: [patch 0/5] Support for sanitization flag in low-level ..., Alan Cox, (Sun May 31, 9:25 am)

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