From 5c0ede0b42ac306c5999995b8ed4357efe1f6eb7 Mon Sep 17 00:00:00 2001
From: Nick Lewycky <nicholas@mxc.ca>
Date: Sat, 13 Jul 2019 17:57:30 -0700
Subject: [PATCH] Initial commit of a fuzzer. Run with "cargo fuzz run
 simple_instantiate".

Used to discover issue #558.

We'll probably want to reconsider the default .gitignore of the artifacts and corpus directories. The fuzzer wastes a lot of time not having even a single exampel of a valid .wasm file to start with.
---
 fuzz/.gitignore                         |  4 ++++
 fuzz/Cargo.toml                         | 21 +++++++++++++++++++++
 fuzz/fuzz_targets/simple_instantiate.rs | 13 +++++++++++++
 3 files changed, 38 insertions(+)
 create mode 100644 fuzz/.gitignore
 create mode 100644 fuzz/Cargo.toml
 create mode 100644 fuzz/fuzz_targets/simple_instantiate.rs

diff --git a/fuzz/.gitignore b/fuzz/.gitignore
new file mode 100644
index 00000000000..572e03bdf32
--- /dev/null
+++ b/fuzz/.gitignore
@@ -0,0 +1,4 @@
+
+target
+corpus
+artifacts
diff --git a/fuzz/Cargo.toml b/fuzz/Cargo.toml
new file mode 100644
index 00000000000..5c37cb47ed3
--- /dev/null
+++ b/fuzz/Cargo.toml
@@ -0,0 +1,21 @@
+
+[package]
+name = "wasmer-fuzz"
+version = "0.0.1"
+authors = ["Automatically generated"]
+publish = false
+
+[package.metadata]
+cargo-fuzz = true
+
+[dependencies]
+wasmer-runtime = { path = "../lib/runtime" }
+libfuzzer-sys = { git = "https://github.com/rust-fuzz/libfuzzer-sys.git" }
+
+# Prevent this from interfering with workspaces
+[workspace]
+members = ["."]
+
+[[bin]]
+name = "simple_instantiate"
+path = "fuzz_targets/simple_instantiate.rs"
diff --git a/fuzz/fuzz_targets/simple_instantiate.rs b/fuzz/fuzz_targets/simple_instantiate.rs
new file mode 100644
index 00000000000..831bbb1a510
--- /dev/null
+++ b/fuzz/fuzz_targets/simple_instantiate.rs
@@ -0,0 +1,13 @@
+#![no_main]
+#[macro_use] extern crate libfuzzer_sys;
+extern crate wasmer_runtime;
+
+use wasmer_runtime::{
+    instantiate,
+    imports,
+};
+
+fuzz_target!(|data: &[u8]| {
+    let import_object = imports! {};
+    instantiate(data, &import_object);
+});