Messages in this thread | | | From | Hannes Frederic Sowa <> | Subject | Re: [BUG/PATCH] kernel RNG and its secrets | Date | Wed, 18 Mar 2015 18:56:19 +0100 |
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On Wed, Mar 18, 2015, at 18:41, Theodore Ts'o wrote: > Maybe we should add a kernel self-test that automatically checks > whether or not memset_explicit() gets optimized away? Otherwise we > might not notice when gcc or how we implement barrier() or whatever > else we end up using ends up changing. > > It shold be something that is really fast, so it might be a good idea > to simply automatically run it as part of an __initcall() > unconditionally. We can debate where the __initcall() lives, but I'd > prefer that it be run even if the crypto layer isn't configured for > some reason. Hopefully such an self-test is small enough that the > kernel bloat people won't complain. :-) > > -Ted
Maybe a BUILD_BUGON: ;)
__label__ l1, l2; char buffer[1024]; l1: memset(buffer, 0, 1024); l2: BUILD_BUGON(&&l1 == &&l2);
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