From 52769cb422aa878b6c6fef76c9356787db3f766e Mon Sep 17 00:00:00 2001
From: Wiktor Kwapisiewicz <wiktor@metacode.biz>
Date: Fri, 5 Apr 2024 12:23:43 +0200
Subject: [PATCH] Add fuzzing setup for `Message::decode`

Signed-off-by: Wiktor Kwapisiewicz <wiktor@metacode.biz>
---
 fuzz/.gitignore                     |    4 +
 fuzz/Cargo.lock                     | 1051 +++++++++++++++++++++++++++
 fuzz/Cargo.toml                     |   22 +
 fuzz/README.md                      |   24 +
 fuzz/fuzz_targets/message_decode.rs |   10 +
 5 files changed, 1111 insertions(+)
 create mode 100644 fuzz/.gitignore
 create mode 100644 fuzz/Cargo.lock
 create mode 100644 fuzz/Cargo.toml
 create mode 100644 fuzz/README.md
 create mode 100644 fuzz/fuzz_targets/message_decode.rs

diff --git a/fuzz/.gitignore b/fuzz/.gitignore
new file mode 100644
index 0000000..1a45eee
--- /dev/null
+++ b/fuzz/.gitignore
@@ -0,0 +1,4 @@
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diff --git a/fuzz/Cargo.lock b/fuzz/Cargo.lock
new file mode 100644
index 0000000..3c68b16
--- /dev/null
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diff --git a/fuzz/Cargo.toml b/fuzz/Cargo.toml
new file mode 100644
index 0000000..26357a1
--- /dev/null
+++ b/fuzz/Cargo.toml
@@ -0,0 +1,22 @@
+[package]
+name = "ssh-agent-lib-fuzz"
+version = "0.0.0"
+publish = false
+edition = "2021"
+
+[package.metadata]
+cargo-fuzz = true
+
+[dependencies]
+libfuzzer-sys = "0.4"
+ssh-encoding = "0.2.0"
+
+[dependencies.ssh-agent-lib]
+path = ".."
+
+[[bin]]
+name = "message_decode"
+path = "fuzz_targets/message_decode.rs"
+test = false
+doc = false
+bench = false
diff --git a/fuzz/README.md b/fuzz/README.md
new file mode 100644
index 0000000..40d13db
--- /dev/null
+++ b/fuzz/README.md
@@ -0,0 +1,24 @@
+# Fuzzing
+
+This directory contains fuzzing targets for ssh-agent-lib.
+
+## Setup
+
+Install [`cargo-fuzz`](https://crates.io/crates/cargo-fuzz):
+
+```sh
+cargo install --locked cargo-fuzz
+```
+
+## Running
+
+Select a target from the list printed by `cargo fuzz list` e.g. `message_decode`:
+
+```sh
+cargo +nightly fuzz run --jobs 32 message_decode
+```
+
+Note that due to a limitation of cargo-fuzz nightly version of the toolchain is required.
+The number of jobs is configurable.
+
+For more details see [Fuzzing with cargo-fuzz](https://rust-fuzz.github.io/book/cargo-fuzz.html).
diff --git a/fuzz/fuzz_targets/message_decode.rs b/fuzz/fuzz_targets/message_decode.rs
new file mode 100644
index 0000000..c95ef31
--- /dev/null
+++ b/fuzz/fuzz_targets/message_decode.rs
@@ -0,0 +1,10 @@
+#![no_main]
+
+use libfuzzer_sys::fuzz_target;
+use ssh_agent_lib::proto::message::Message;
+use ssh_encoding::Decode;
+
+fuzz_target!(|data: &[u8]| {
+    let mut data = data;
+    let _ = Message::decode(&mut data);
+});