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diff --git a/tests/libfuzzer/README b/tests/libfuzzer/README new file mode 100644 index 0000000000..7327e76eff --- /dev/null +++ b/tests/libfuzzer/README @@ -0,0 +1,39 @@ +This directory contains tests to be run with clang's libFuzzer. It will generate data, pass this +data to the function + + LLVMFuzzerTestOneInput(const char *Data, size_t Size) + +of the test and track the code execution. Should the test crash, libFuzzer will provide you with the +data which triggered the crash. You can then use this to debug and fix the called code. + +! Please note: The purpose of fuzz testing is to find unexpected code paths. Running fuzz tests may! +! result in unforeseen bevavior, including loss of data. Consider running the tests in an isolated ! +! environment, e.g. on a virtual machine. You have been warned. ! + +To run a test with libFuzzer: + +1. Install clang 5.0 or later, e.g. from the repositories of the Linux distribution you are using. + Depending on the version of clang and the source you are installing from, you might have to + install libFuzzer for this version of clang explicitly. +2. Make sure clang and clang++ from this version of clang are found in PATH. +3. Configure Qt with + -platform linux-clang -coverage trace-pc-guard + to add the needed code coverage instrumentation. Since speed of execution is crucial for fuzz + testing, it's recommendable to also use the switches + -release -static + It might also make sense to add sanitzers by passing + -sanitize <...> +4. Build Qt. +5. Build one of the tests using this Qt build. +6. Execute the resulting executable. + Depending on the expected input format of the tested function, you will get results faster if + you: + * provide a set of interesting input data by passing the path of a directory which contains + these data, each in one file. You can find such datasets in the subdirectory "testcases". + * pass a so-called dictionary listing keywords of the input format using + -dict=<dictionary file> + A couple of such dictionaries are provided by AFL (http://lcamtuf.coredump.cx/afl/) + * tell libFuzzer to generate only ASCII data using + -only_ascii=1 + +For further info, see https://llvm.org/docs/LibFuzzer.html |