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8b3bf39ab8
Currently the xcm-executor returns an `Unimplemented` error if it receives any HRMP-related instruction. What I propose here, which is what we are currently doing in our forked executor at polimec, is to introduce a trait implemented by the executor which will handle those instructions. This way, if parachains want to keep the default behavior, they just use `()` and it will return unimplemented, but they can also implement their own logic to establish HRMP channels with other chains in an automated fashion, without requiring to go through governance. Our implementation is mentioned in the [polkadot HRMP docs](https://arc.net/l/quote/hduiivbu), and it was suggested to us to submit a PR to add these changes to polkadot-sdk. --------- Co-authored-by: Branislav Kontur <bkontur@gmail.com> Co-authored-by: command-bot <>
XCM Simulator Fuzzer
This project will fuzz-test the XCM simulator. It can catch reachable panics, timeouts as well as integer overflows and underflows.
Install dependencies
cargo install honggfuzz
Run the fuzzer
In this directory, run this command:
HFUZZ_BUILD_ARGS="--features=try-runtime" cargo hfuzz run xcm-fuzzer
Run a single input
In this directory, run this command:
cargo run --features=try-runtime -- hfuzz_workspace/xcm-fuzzer/fuzzer_input_file
Generate coverage
In this directory, run these four commands:
RUSTFLAGS="-Zprofile -Ccodegen-units=1 -Copt-level=0 -Clink-dead-code -Coverflow-checks=off -Zpanic_abort_tests -Cpanic=abort" \
CARGO_INCREMENTAL=0 SKIP_WASM_BUILD=1 CARGO_HOME=./cargo cargo build --features=try-runtime
../../../target/debug/xcm-fuzzer hfuzz_workspace/xcm-fuzzer/input/
zip -0 ccov.zip `find ../../../target/ \( -name "*.gc*" -o -name "test-*.gc*" \) -print`
grcov ccov.zip -s ../../../ -t html --llvm --branch --ignore-not-existing -o ./coverage
The code coverage will be in ./coverage/index.html.