45 lines
1.6 KiB
Markdown
45 lines
1.6 KiB
Markdown
# Fuzzing with AFL
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Clixon can be fuzzed with [american fuzzy lop](https://github.com/google/AFL/releases) but not without pain.
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So far the backend and cli can be fuzzed.
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Some issues are as follows:
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- Static linking. Fuzzing requires static linking. You can statically link clixon using: `LINKAGE=static ./configure` but that does not work with Clixon plugins (at least yet). Therefore fuzzing has been made with no plugins using the hello example only.
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- Multiple processes. Only the backend can run stand-alone, cli/netconf/restconf requires a backend. When you fuzz eg clixon_cli, the backend must be running and it will be slow due to IPC. Possibly one could link them together and run as a monolith by making a threaded image.
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Restconf also has the extra problem of running TLS sockets.
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## Prereqs
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See [AFL docs](https://afl-1.readthedocs.io/en/latest) for installing afl.
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On ubuntu this may be enough:
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```
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sudo apt install afl
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```
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You may have to change cpu frequency:
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```
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cd /sys/devices/system/cpu
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echo performance | tee cpu?/cpufreq/scaling_governor
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```
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And possibly change core behaviour:
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```
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echo core >/proc/sys/kernel/core_pattern
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```
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### backend/restconf
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Backend and restconf requires the preeny package to change sockets to stdio.
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Preeny has a "desocketizing" module necessary to map stdio to the internal sockets that the backend uses. Install preeny example:
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```
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sudo apt install libini-config-dev # debian/ubuntu
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sudo apt install libseccomp-dev # debian/ubuntu
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git clone https://github.com/zardus/preeny.git
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cd preeny
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make
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sudo cp x86_64-linux-gnu/desock.so /usr/local/lib/ # install
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```
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