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Message-ID: <20120627194737.GA19640@openwall.com>
Date: Wed, 27 Jun 2012 23:47:37 +0400
From: Solar Designer <solar@...nwall.com>
To: john-dev@...ts.openwall.com
Subject: Re: RAR cmp_one(3) failures
On Wed, Jun 27, 2012 at 09:42:51PM +0200, magnum wrote:
> Oh. But the very first time it's called, we are in the self-test with a
> crypt_all(1), right? So there should only be one thread.
No, we're in there with crypt_all(3), and we're running 4 threads.
This also explains why I was unable to trigger the bug with fewer than 4
threads.
> I'm extremely happy if we can kill this bug!
Me too. Patch attached.
Sorry for this counter-intuitive CRC32_Init() interface, which mimics
OpenSSL's thread-safe interfaces but actually is not... I actually knew
of this limitation many years ago when I wrote this code, but of course
I did not recall until I debugged it the hard way today.
Alexander
View attachment "john-rar-crc32-race.diff" of type "text/plain" (431 bytes)
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