2 Commits

Author	SHA1	Message	Date
Matt Morehouse	f3c2e0bcee	[libFuzzer] Enable entropic by default. ... Entropic has performed at least on par with vanilla scheduling on Clusterfuzz, and has shown a slight coverage improvement on FuzzBench: https://www.fuzzbench.com/reports/2020-08-31/index.html Reviewed By: Dor1s Differential Revision: https://reviews.llvm.org/D87476	2020-09-16 10:44:34 -07:00
Dokyung Song	b53243e194	[libFuzzer] Evenly select inputs to cross over with from the corpus regardless of the input's coverage. ... This patch adds an option "cross_over_uniform_dist", which, if 1, considers all inputs in the corpus for the crossover input selection. More specifically, this patch uses a uniform distribution of all inputs in the corpus for the CrossOver input selection. Note that input selection for mutation is still fully determined by the scheduling policy (i.e., vanilla or Entropic); the uniform distribution only applies to the secondary input selection, only for the crossover mutation of the base input chosen by the scheduling policy. This way the corpus inputs that have useful fragments in them, even though they are deprioritized by the scheduling policy, have chances of getting mixed with other inputs that are prioritized and selected as base input for mutation. Differential Revision: https://reviews.llvm.org/D86954	2020-09-03 19:47:00 +00:00