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db: fix 64-bit argument comparisons
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Our approach to doing 64-bit comparisons using 32-bit operators was
just plain wrong, leading to a number of potential problems with
filters that used the LT, GT, LE, or GE operators.  This patch fixes
this problem and a few other related issues that came to light in
the course of fixing the core problem.

A special thanks to Jann Horn for bringing this problem to our
attention.

Signed-off-by: Paul Moore <paul@paul-moore.com>
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pcmoore committed Mar 14, 2019
1 parent 3e5a13d commit c5bf78d
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