https://llvm.org/bugs/show_bug.cgi?id=31583
Bug ID: 31583
Summary: libFuzzer shouldn't disable default mutators when a
custom one is defined
Product: new-bugs
Version: trunk
Hardware: PC
OS: All
Status: NEW
Severity: normal
Priority: P
Component: new bugs
Assignee: unassignedb...@nondot.org
Reporter: ttaub...@mozilla.com
CC: llvm-bugs@lists.llvm.org
Classification: Unclassified
Currently, libFuzzer disables all default mutators and only the custom mutator,
if one is defined. We're currently applying the patch below to get the default
ones back when building against libFuzzer:
> diff --git libFuzzer/FuzzerMutate.cpp libFuzzer/FuzzerMutate.cpp
> --- libFuzzer/FuzzerMutate.cpp
> +++ libFuzzer/FuzzerMutate.cpp
> @@ -52,10 +52,9 @@
> DefaultMutators.push_back(
> {&MutationDispatcher::Mutate_AddWordFromTORC, "CMP"});
>
> + Mutators = DefaultMutators;
> if (EF->LLVMFuzzerCustomMutator)
> Mutators.push_back({&MutationDispatcher::Mutate_Custom, "Custom"});
> - else
> - Mutators = DefaultMutators;
>
> if (EF->LLVMFuzzerCustomCrossOver)
> Mutators.push_back(
--
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