cloud-hypervisor/docs/fuzzing.md

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# Fuzzing in Cloud Hypervisor
Cloud Hypervisor uses [cargo-fuzz](https://github.com/rust-fuzz/cargo-fuzz) for fuzzing individual components.
The fuzzers are are in the `fuzz/fuzz_targets` directory
## Preparation
Switch to nightly:
````
rustup override set nightly
````
Install `cargo fuzz`:
```
cargo install cargo-fuzz
```
## Running the fuzzers
e.g. To run the `qcow` fuzzer using all available CPUs:
```
cargo fuzz run qcow -j `nproc`
```
## Adding a new fuzzer
```
cargo fuzz add <new_fuzzer>
```
Inspiration for fuzzers can be found in [crosvm](https://chromium.googlesource.com/chromiumos/platform/crosvm/+/refs/heads/master/fuzz/)