Move integration test artifacts into primary source tree (#336)

src/integration-tests/libfuzzer-rust/Cargo.toml

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+[package]
+name = "rust_fuzz_example"
+version = "0.1.0"
+license = "MIT"
+authors = ["<fuzzing@microsoft.com>"]
+edition = "2018"
+
+[dependencies]
+libc = "0.2.79"

src/integration-tests/libfuzzer-rust/Makefile

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+.PHONY: all clean
+
+all: 
+	rustup install nightly
+	cargo install cargo-fuzz 
+	cargo +nightly fuzz build --release
+
+clean:
+	cargo clean
+	(cd fuzz; cargo clean)

src/integration-tests/libfuzzer-rust/README.md

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+# Fuzzing Rust in OneFuzz
+
+OneFuzz can orchastrate fuzzing of Rust using
+[cargo-fuzz](https://crates.io/crates/cargo-fuzz) to build libfuzzer based
+fuzzing targets.
+
+Included in this directory is a simple example to demonstrate rust based
+fuzzing.  For more examples, check out the libfuzzer examples in the [rust
+fuzzing trophy case](https://github.com/rust-fuzz/trophy-case).
+
+## Example command
+
+```bash
+# ensure the latest cargo-fuzz is installed
+cargo install cargo-fuzz --force     
+# build your fuzzing targets
+cargo +nightly fuzz build --release  
+# Launch a fuzz job for each of the targets provided by cargo-fuzz
+for target in $(cargo fuzz list); do
+    onefuzz template libfuzzer basic $PROJECT_NAME $target $BUILD_NUMBER $POOL_NAME --target_exe ./fuzz/target/x86_64-unknown-linux-gnu/release/$target --inputs ./fuzz/corpus/$target
+done
+```

src/integration-tests/libfuzzer-rust/fuzz/.gitignore

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+target
+corpus
+artifacts

src/integration-tests/libfuzzer-rust/fuzz/Cargo.toml

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+[package]
+name = "rust-fuzz"
+version = "0.0.0"
+authors = ["Automatically generated"]
+publish = false
+edition = "2018"
+
+[package.metadata]
+cargo-fuzz = true
+
+[dependencies]
+libfuzzer-sys = "0.3"
+
+[dependencies.rust_fuzz_example]
+path = ".."
+
+# Prevent this from interfering with workspaces
+[workspace]
+members = ["."]
+
+[[bin]]
+name = "fuzz_target_1"
+path = "fuzz_targets/fuzz_target_1.rs"
+test = false
+doc = false

src/integration-tests/libfuzzer-rust/fuzz/fuzz_targets/fuzz_target_1.rs

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+#![no_main]
+use libfuzzer_sys::fuzz_target;
+use rust_fuzz_example;
+
+fuzz_target!(|data: &[u8]| {
+    rust_fuzz_example::check(data);
+});

src/integration-tests/libfuzzer-rust/src/lib.rs

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+// Copyright (c) Microsoft Corporation. All rights reserved.
+// Licensed under the MIT License.
+
+extern crate libc;
+
+pub fn check(data: &[u8]) -> bool {
+    if data.len() < 4 {
+        return false;
+    }
+
+    if data[0] != 0x41 {
+        return false;
+    }
+
+    if data[1] != 0x42 {
+        return false;
+    }
+
+    if data[2] != 0x43 {
+        return false;
+    }
+
+    match data[3] {
+        // OOB access
+        4 => data[100000] == 0xFF,
+        // null ptr
+        5 => unsafe {
+            let ptr: *mut u8 = 0 as *mut u8;
+            *ptr = 10;
+            true
+        },
+        _ => false,
+    }
+}