Chromium Blog: Fuzzing for Security

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Fuzzing for Security

Donnerstag, 26. April 2012

fuzzingLKGR (Last Known Good Revision)

Managing test cases and infrastructure - To run at maximum capacity we need to generate a constant stream of test cases, distribute them across thousands of Chrome instances running on hundreds of virtual machines, and track the results.

Analyzing crashes - The only crashes we care about for security purposes are the exploitable ones. So we use Address Sanitizer to instrument our Chrome binaries and provide detailed reports on potentially exploitable crashes.

Minimizing test cases - Fuzzer test cases are often very large files—usually as much as several hundred kilobytes each. So we take the generated test cases and distill them down to the few, essential pieces that actually trigger the crash.

Identifying regressions - The first step in getting a crash fixed is figuring out where it is and who should fix it. So this phase tracks the crash down to the range of changes that introduced it.

Verifying fixes - In order to verify when a crash is actually fixed, which we run the open crash cases against each new LKGR build.

security principlesWebKitFFmpegPosted by Abhishek Arya and Cris Neckar, Chrome Security Team

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