Messages in this thread | | | From | Stephan Mueller <> | Subject | Re: [BUG/PATCH] kernel RNG and its secrets | Date | Mon, 27 Apr 2015 21:10:14 +0200 |
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Am Freitag, 10. April 2015, 16:50:22 schrieb Stephan Mueller:
Hi Stephan,
>Am Freitag, 10. April 2015, 16:46:04 schrieb Daniel Borkmann: > >Hi Daniel, > >>On 04/10/2015 04:36 PM, Stephan Mueller wrote: >>> Am Freitag, 10. April 2015, 16:26:00 schrieb Hannes Frederic Sowa: >>... >> >>>> I suspected a problem in how volatile with non-present output args could >>>> be different, but this seems not to be the case. >>>> >>>> I would contact llvm/clang mailing list and ask. Maybe there is a >>>> problem? It seems kind of strange to me... >> >>+1 >> >>> Do you really think this is a compiler issue? >> >>If clang/LLVM advertises "GCC compatibility", then this would >>certainly be a different behavior. > >As you wish. I will contact the clang folks. As the proposed fix is not super >urgend, I think we can leave it until I got word from clang.
I posted the issue on the clang mailing list on April 10 -- no word so far. I would interpret this as a sign that it is a no-issue for them.
Thus, I propose we update our memzero_explicit implementation to use
__asm__ __volatile__("" : "=r" (s) : "0" (s) : "memory");
Concerns?
Ciao Stephan
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