From 4de52364db6a92de6ed45d86bc5bc59c599b7d24 Mon Sep 17 00:00:00 2001
From: Joe Birr-Pixton <jpixton@gmail.com>
Date: Wed, 18 Sep 2024 12:11:40 +0100
Subject: [PATCH] Add fuzz target for PEM decoding

---
 fuzz/Cargo.lock          |  2 +-
 fuzz/Cargo.toml          |  7 +++++++
 fuzz/corpus/pem/zen.pem  |  1 +
 fuzz/fuzz_targets/pem.rs | 16 ++++++++++++++++
 4 files changed, 25 insertions(+), 1 deletion(-)
 create mode 120000 fuzz/corpus/pem/zen.pem
 create mode 100644 fuzz/fuzz_targets/pem.rs

diff --git a/fuzz/Cargo.lock b/fuzz/Cargo.lock
index 15d45c4..2730088 100644
--- a/fuzz/Cargo.lock
+++ b/fuzz/Cargo.lock
@@ -52,7 +52,7 @@ checksum = "3fdb12b2476b595f9358c5161aa467c2438859caa136dec86c26fdd2efe17b92"
 
 [[package]]
 name = "rustls-pki-types"
-version = "1.3.1"
+version = "1.8.0"
 
 [[package]]
 name = "rustls-pki-types-fuzz"
diff --git a/fuzz/Cargo.toml b/fuzz/Cargo.toml
index 40ac233..4bfa301 100644
--- a/fuzz/Cargo.toml
+++ b/fuzz/Cargo.toml
@@ -12,6 +12,7 @@ libfuzzer-sys = "0.4"
 
 [dependencies.rustls-pki-types]
 path = ".."
+features = ["std"]
 
 # Prevent this from interfering with workspaces
 [workspace]
@@ -25,3 +26,9 @@ name = "private_key"
 path = "fuzz_targets/private_key.rs"
 test = false
 doc = false
+
+[[bin]]
+name = "pem"
+path = "fuzz_targets/pem.rs"
+test = false
+doc = false
diff --git a/fuzz/corpus/pem/zen.pem b/fuzz/corpus/pem/zen.pem
new file mode 120000
index 0000000..644365f
--- /dev/null
+++ b/fuzz/corpus/pem/zen.pem
@@ -0,0 +1 @@
+../../../tests/data/zen.pem
\ No newline at end of file
diff --git a/fuzz/fuzz_targets/pem.rs b/fuzz/fuzz_targets/pem.rs
new file mode 100644
index 0000000..8a629f5
--- /dev/null
+++ b/fuzz/fuzz_targets/pem.rs
@@ -0,0 +1,16 @@
+#![no_main]
+
+use std::io::BufReader;
+use std::hint::black_box;
+
+use libfuzzer_sys::fuzz_target;
+
+use rustls_pki_types::pem;
+
+fuzz_target!(|data: &[u8]| {
+    for x in pem::Item::iter_from_buf(&mut BufReader::new(data)) {
+        let _ = black_box(x);
+    }
+
+    let _ = black_box(pem::Item::from_slice(data));
+});