Add libvharness and InputSetter. Set coverage map from inside the VM. Refactor commands. #3366
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create a rust sys crate for libvharness. remove old (now useless) bindings.
domenukk
reviewed
Aug 19, 2025
fix fuzzers.
1 task
- fix libvharness lints
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libvharness is a library to help making harnesses for libafl qemu more easily.
there is a new feature to optionally compile
nyxcommand stuff, it should avoid the mess with having both libafl qemu commands and nyx commands altogether we've seen in previous issues.InputSetteris just an abstraction of how the input should be set in qemu. before, it was implemented as part of the command manager, so code reuse was not really possible.SetMapCommandis a new command used to define coverage maps (including cmplog maps) from inside a VM. the main use case is when this gets coupled with something like KCOV. it makes it easier / more efficient to get the correct coverage compared with manual address filtering. the current implementation of KCOV is not enough to get this command working correctly, there is a linux patch to apply I'll try to push soon.add
qemu_linux_kernelexample in the toolchain. make the qemu image builder available publicly.