Add basic options and documentations for fuzzing #1601
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danobi
reviewed
Nov 10, 2020
This option lets the program stop right after the specified process.
The supported arguments are either 'semantic' or 'codegen'. For example,
`bpftrace --test semantic -e 'BEGIN{}'` does semantic analysis and then
quits. This option is useful for tests and fuzzing.
This option is intended for developers, and its usage is not included in
the reference guide.
danobi
reviewed
Nov 10, 2020
This visitor calls a callback function on each node.
When doing fuzzing, it is important to limit the number of AST nodes because otherwise a fuzzer might keep to generate a very long program that cause a stack overflow. This introduces `BPFTRACE_NODE_MAX` environment variable, and it controls the maximum number of AST nodes. This feature is intended for developers, and its usage is not included in the reference guide.
danobi
approved these changes
Nov 10, 2020
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Maybe we can try https://github.com/google/oss-fuzz too |
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Several months ago and the last month, I fuzzed bftrace with AFL and found several bugs. This PR adds the documentation about it and some options useful for fuzzing. There are many fuzzers other than AFL and several techniques. I've been trying to fuzz various ways in my spare time and find some useful ways. I plan to update the document later. Also, I hope for more people to try to fuzz and find bugs and make bpftrace safer :)
Please read each commit messages and docs/fuzzing.md for the details.
Checklist
docs/reference_guide.mdCHANGELOG.md