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artagnon.com · Aug 23, 2015

An ABI-mismatch bug

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Our custom max function returns the maximum of two positive integers, and returns the negative integer, given a positive and negative integer. Classic signed wrapping, you'd think. It's not so simple, as the problem reproduces only under the following circumstances: LLVM code is calling the max function. The library containing the max function is compiled without debugging information. The entire…

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