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By patching QEMU, TriforceAFL and AFL++ managed to get coverage feedback out of any binary that QEMU can run. How cool is that?!
By patching QEMU, TriforceAFL and AFL++ managed to get coverage feedback out of any binary that QEMU can run. How cool is that?!
QEMU user-mode is a tool of QEMU that allows emulating just the userspace (in contrast to the normal mode where both the user-mode and the kernel are emulated). This is done by forwarding any syscalls from the target program to the host machine. The main benefits are improved performance and less complex enviroment but it sacrifices on the portability. AFL++ fork of QEMU uses this mechanism while adding coverage tracking and optional performance optimizations.
Full example here https://github.com/bitterbit/fuzzer-qemu/blob/fb9170ba1f2723592844ee368fcc33ef25b04f39/src/src/main.rs
QEMU is an emulator that can emulate many cpu architectures, For example it can run Android (arm) on your PC (x86) or run Windows on your iPad UTM.