rpm/librpm/rpm-python memory corruption pre-verification

[Tavis Ormandy <taviso () cmpxchg8b com>]

Hey, after the scary flaws Georgi spotted in apt-get, I had a quick look at
rpm signature verification. Some trivial bitflipping found a few memory
corruption issues.

Originally I didn't think yum used rpm, but i was wrong, rpm-python is a
native module wrapper that exports librpm to python. I'll step through the
signature verification logic when I get a chance.

Obviously we need the sections of rpm code touched before signature
verification to be bulletproof, as most distributions rely on public mirror
services that may or may not be trusted. Any volunteers who know crypto
better than me appreciated, I'll be primarily looking for memory corruption.

https://bugzilla.redhat.com/show_bug.cgi?id=741606
https://bugzilla.redhat.com/show_bug.cgi?id=741612

Tavis.

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