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44 lines
2.4 KiB
Markdown
44 lines
2.4 KiB
Markdown
# Fuzzing LND #
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The `fuzz` package is organized into subpackages which are named after the `lnd` package they test. Each subpackage has its own set of fuzz targets.
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## Setup and Installation ##
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This section will cover setup and installation of the fuzzing binaries.
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* The following is a command to build all fuzzing harnesses:
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```shell
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⛰ make fuzz-build
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```
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* This may take a while since this will create zip files associated with each fuzzing target.
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* The following is a command to run all fuzzing harnesses for 30 seconds:
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```shell
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⛰ make fuzz-run
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```
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`go-fuzz` will print out log lines every couple of seconds. Example output:
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```text
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2017/09/19 17:44:23 workers: 8, corpus: 23 (3s ago), crashers: 1, restarts: 1/748, execs: 400690 (16694/sec), cover: 394, uptime: 24s
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```
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Corpus is the number of items in the corpus. `go-fuzz` may add valid inputs to
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the corpus in an attempt to gain more coverage. Crashers is the number of inputs
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resulting in a crash. The inputs, and their outputs are logged by default in:
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`fuzz/<package>/<harness>/crashers`. `go-fuzz` also creates a `suppressions` directory
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of stacktraces to ignore so that it doesn't create duplicate stacktraces.
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Cover is a number representing edge coverage of the program being fuzzed.
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## Options ##
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Several parameters can be appended to the end of the make commands to tune the build process or the way the fuzzer runs.
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- `run_time` specifies how long each fuzz harness runs for. The default is 30 seconds.
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- `timeout` specifies how long an individual testcase can run before raising an error. The default is 20 seconds.
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- `processes` specifies the number of parallel processes to use while running the harnesses.
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- `pkg` specifies the `lnd` packages to build or fuzz. The default is to build and run all available packages (`brontide lnwire wtwire zpay32`). This can be changed to build/run against individual packages.
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- `base_workdir` specifies the workspace of the fuzzer. This folder will contain the corpus, crashers, and suppressions.
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## Corpus ##
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Fuzzing generally works best with a corpus that is of minimal size while achieving the maximum coverage. `go-fuzz` automatically minimizes the corpus in-memory before fuzzing so a large corpus shouldn't make a difference.
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## Disclosure ##
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If you find any crashers that affect LND security, please disclose with the information found [here](https://github.com/lightningnetwork/lnd/#security).
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