Date: Wed, 06 Jun 2012 12:40:24 +0200 From: magnum <john.magnum@...hmail.com> To: john-dev@...ts.openwall.com Subject: RAR bug (was: off-list) On 06/06/2012 11:02 AM, magnum wrote: > On 06/05/2012 Solar Designer wrote: >> Here's what I got: >> >> $ ./john -w=password.lst -ru pw-rar >> Loaded 1 password hash (RAR3 [32/64]) >> Self test failed (cmp_one(3)) >> >> This happened just once. Repeating the command did not reproduce it >> (cracking started fine). I think the machine's hardware is fine. This >> could be some bug in the code triggered by specific address layout. >> (ASLR is enabled.) > > Yes, I have seen this occasionally. It happens with CPU or OpenCL code, > and with OMP or not. I just can't find the reason! I have audited the > code (I never hit the bug when debugging) and I can't see what could be > wrong. By the way, I think it is always cmp_one(3) and this means it's the -p -m3 test, that is the libclamav unrar code path that fails. I have looked at all initializations and I can't see anything amiss. I know just a little about ASLR. I don't see how it could trigger a thing like this? Could it be a buffer overrun that only get serious with some layouts? Wouldn't the relative layout be the same within any segment, and within the stack? magnum
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