Added cargo-fuzz tests for Rlp crate

util/rlp/fuzz/.gitignore

@@ -0,0 +1,4 @@
+
+target
+corpus
+artifacts

util/rlp/fuzz/Cargo.toml

@@ -0,0 +1,36 @@
+
+[package]
+name = "rlp-fuzz"
+version = "0.0.1"
+authors = ["Parity Technologies <admin@parity.io>"]
+publish = false
+build = "build.rs"
+
+[package.metadata]
+cargo-fuzz = true
+
+[features]
+nightly = []
+
+[dependencies]
+rand = "0.3"
+
+[build-dependencies]
+rustc_version = "0.2.1"
+
+[dependencies.rlp]
+path = ".."
+[dependencies.libfuzzer-sys]
+git = "https://github.com/rust-fuzz/libfuzzer-sys.git"
+
+# Prevent this from interfering with workspaces
+[workspace]
+members = ["."]
+
+[[bin]]
+name = "untrusted"
+path = "fuzz_targets/untrusted.rs"
+
+[[bin]]
+name = "append_raw"
+path = "fuzz_targets/append_raw.rs"

util/rlp/fuzz/README.md

@@ -0,0 +1,38 @@
+#Fuzzing crates with cargo-fuzz
+
+##Installation
+Install cargo-fuzz using cargo:
+  - `cargo install cargo-fuzz`
+
+##Initializing fuzz tests
+Change into the target crate's base directory, e.g.:
+  - `cd parity/util/rlp`
+
+Initialize the fuzz directory:
+  - `cargo fuzz init`
+  - `cargo fuzz init -t named_first_test`
+
+Fuzz tests stored under `./fuzz/fuzz_targets/*.rs`
+
+##Adding tests
+Add a test named `anyname` under `fuzz/fuzz_targets/anyname.rs`:
+  - `cargo fuzz add anyname`
+
+This also adds an entry to `fuzz/Cargo.toml` for creating a binary target
+with the test's name, e.g.
+```
+[[bin]]
+name = "anyname"
+path = "fuzz_targets/anyname.rs"
+```
+
+##Editing tests
+Make changes and import any necessary libraries to test target features
+  - `vim ./fuzz/fuzz_targets/untrusted.rs`
+
+##Running tests
+While still in the crate's root directory, run the following:
+  - `cargo fuzz run <test-name>`
+  - `cargo fuzz run -j <num-jobs> <test-name>` for parallell jobs
+
+Examples and detailed information on libfuzzer output can be found [here](https://rust-fuzz.github.io/book/cargo-fuzz/tutorial.html)

util/rlp/fuzz/build.rs

@@ -0,0 +1,19 @@
+extern crate rustc_version;
+use rustc_version::{version, version_meta, Channel, Version};
+
+fn main() {
+    assert!(version().unwrap().major >= 1);
+
+    match version_meta().unwrap().channel {
+        Channel::Stable => {
+        }
+        Channel::Beta => {
+        }
+        Channel::Nightly => {
+            println!("cargo:rustc-cfg=feature=\"nightly\"")
+        }
+        Channel::Dev => {
+        }
+    }
+
+}

util/rlp/fuzz/fuzz_targets/append_raw.rs

@@ -0,0 +1,19 @@
+#![no_main]
+#![cfg(feature = "nightly")]
+#[macro_use] extern crate libfuzzer_sys;
+extern crate rlp;
+extern crate rand;
+
+use rlp::RlpStream;
+use rand::Rng;
+
+fuzz_target!(|data: &[u8]| {
+    let mut rls = RlpStream::new();
+
+    // Generate random item count to further fuzz append_raw's parsing
+    let mut rng = rand::thread_rng();
+    let rand_item_count = rng.gen_range::<usize>(1 as usize, 4096 as usize);
+
+    let _ = rls.append_raw(data, rand_item_count);
+});
+

util/rlp/fuzz/fuzz_targets/untrusted.rs

@@ -0,0 +1,11 @@
+#![no_main]
+#![cfg(feature = "nightly")]
+#[macro_use] extern crate libfuzzer_sys;
+extern crate rlp;
+
+use rlp::UntrustedRlp;
+
+fuzz_target!(|data: &[u8]| {
+    let _ = UntrustedRlp::new(data);
+});
+