From 4a982fe632aff23b935e35fcbcb3178395fc7867 Mon Sep 17 00:00:00 2001
From: link2xt <link2xt@testrun.org>
Date: Tue, 27 Dec 2022 09:17:19 +0000
Subject: [PATCH] Add fuzzing tests

---
 CHANGELOG.md                            |    1 +
 README.md                               |   23 +
 format-flowed/src/lib.rs                |    6 +
 fuzz/Cargo.lock                         | 3441 +++++++++++++++++++++++
 fuzz/Cargo.toml                         |   36 +
 fuzz/fuzz_targets/fuzz_dateparse.rs     |   10 +
 fuzz/fuzz_targets/fuzz_format_flowed.rs |   25 +
 fuzz/fuzz_targets/fuzz_mailparse.rs     |    7 +
 fuzz/fuzz_targets/fuzz_simplify.rs      |   13 +
 src/fuzzing.rs                          |    8 +
 src/lib.rs                              |    3 +
 11 files changed, 3573 insertions(+)
 create mode 100644 fuzz/Cargo.lock
 create mode 100644 fuzz/Cargo.toml
 create mode 100644 fuzz/fuzz_targets/fuzz_dateparse.rs
 create mode 100644 fuzz/fuzz_targets/fuzz_format_flowed.rs
 create mode 100644 fuzz/fuzz_targets/fuzz_mailparse.rs
 create mode 100644 fuzz/fuzz_targets/fuzz_simplify.rs
 create mode 100644 src/fuzzing.rs

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 9db270c67..706431cfb 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,6 +7,7 @@
 - Don't parse the message again after detached signatures validation #3862
 - Move format=flowed support to a separate crate #3869
 - cargo: bump quick-xml from 0.23.0 to 0.26.0 #3722
+- Add fuzzing tests #3853
 
 ### API-Changes
 - jsonrpc: add python API for webxdc updates #3872
diff --git a/README.md b/README.md
index 71a723eac..3ea334637 100644
--- a/README.md
+++ b/README.md
@@ -115,6 +115,29 @@ use the `--ignored` argument to the test binary (not to cargo itself):
 $ cargo test -- --ignored
 ```
 
+### Fuzzing
+
+Install [`cargo-bolero`](https://github.com/camshaft/bolero) with
+```sh
+$ cargo install cargo-bolero
+```
+
+Run fuzzing tests with
+```sh
+$ cd fuzz
+$ cargo bolero test fuzz_mailparse --release=false -s NONE
+```
+
+Corpus is created at `fuzz/fuzz_targets/corpus`,
+you can add initial inputs there.
+For `fuzz_mailparse` target corpus can be populated with
+`../test-data/message/*.eml`.
+
+To run with AFL instead of libFuzzer:
+```sh
+$ cargo bolero test fuzz_format_flowed --release=false -e afl -s NONE
+```
+
 ## Features
 
 - `vendored`: When using Openssl for TLS, this bundles a vendored version.
diff --git a/format-flowed/src/lib.rs b/format-flowed/src/lib.rs
index 67d18e8d1..52b6827e5 100644
--- a/format-flowed/src/lib.rs
+++ b/format-flowed/src/lib.rs
@@ -182,6 +182,12 @@ mod tests {
 
         let text = "   Foo bar baz";
         assert_eq!(format_flowed(text), "    Foo bar baz");
+
+        let text =
+            "AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAA";
+        let expected =
+            "AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA \r\nAAAAAA";
+        assert_eq!(format_flowed(text), expected);
     }
 
     #[test]
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diff --git a/fuzz/Cargo.toml b/fuzz/Cargo.toml
new file mode 100644
index 000000000..a3eba6256
--- /dev/null
+++ b/fuzz/Cargo.toml
@@ -0,0 +1,36 @@
+[package]
+name = "deltachat-fuzz"
+version = "0.0.0"
+publish = false
+edition = "2021"
+
+[dev-dependencies]
+bolero = "0.8"
+
+[dependencies]
+mailparse = "0.13"
+deltachat = { path = ".." }
+format-flowed = { path = "../format-flowed" }
+
+[workspace]
+members = ["."]
+
+[[test]]
+name = "fuzz_dateparse"
+path = "fuzz_targets/fuzz_dateparse.rs"
+harness = false
+
+[[test]]
+name = "fuzz_simplify"
+path = "fuzz_targets/fuzz_simplify.rs"
+harness = false
+
+[[test]]
+name = "fuzz_mailparse"
+path = "fuzz_targets/fuzz_mailparse.rs"
+harness = false
+
+[[test]]
+name = "fuzz_format_flowed"
+path = "fuzz_targets/fuzz_format_flowed.rs"
+harness = false
diff --git a/fuzz/fuzz_targets/fuzz_dateparse.rs b/fuzz/fuzz_targets/fuzz_dateparse.rs
new file mode 100644
index 000000000..e903363db
--- /dev/null
+++ b/fuzz/fuzz_targets/fuzz_dateparse.rs
@@ -0,0 +1,10 @@
+use bolero::check;
+
+fn main() {
+    check!().for_each(|data: &[u8]| match std::str::from_utf8(data) {
+        Ok(input) => {
+            mailparse::dateparse(input).ok();
+        }
+        Err(_err) => {}
+    });
+}
diff --git a/fuzz/fuzz_targets/fuzz_format_flowed.rs b/fuzz/fuzz_targets/fuzz_format_flowed.rs
new file mode 100644
index 000000000..f44bebf94
--- /dev/null
+++ b/fuzz/fuzz_targets/fuzz_format_flowed.rs
@@ -0,0 +1,25 @@
+use bolero::check;
+use format_flowed::{format_flowed, unformat_flowed};
+
+fn round_trip(input: &str) -> String {
+    let mut input = format_flowed(input);
+    input.retain(|c| c != '\r');
+    unformat_flowed(&input, false)
+}
+
+fn main() {
+    check!().for_each(|data: &[u8]| {
+        if let Ok(input) = std::str::from_utf8(data.into()) {
+            let mut input = input.to_string();
+
+            // Only consider inputs that don't contain quotes.
+            input.retain(|c| c != '>');
+
+            // Only consider inputs that are the result of unformatting format=flowed text.
+            // At least this means that lines don't contain any trailing whitespace.
+            let input = round_trip(&input);
+            let output = round_trip(&input);
+            assert_eq!(input, output);
+        }
+    });
+}
diff --git a/fuzz/fuzz_targets/fuzz_mailparse.rs b/fuzz/fuzz_targets/fuzz_mailparse.rs
new file mode 100644
index 000000000..19f2fe097
--- /dev/null
+++ b/fuzz/fuzz_targets/fuzz_mailparse.rs
@@ -0,0 +1,7 @@
+use bolero::check;
+
+fn main() {
+    check!().for_each(|data: &[u8]| {
+        mailparse::parse_mail(data).ok();
+    });
+}
diff --git a/fuzz/fuzz_targets/fuzz_simplify.rs b/fuzz/fuzz_targets/fuzz_simplify.rs
new file mode 100644
index 000000000..cd0a22352
--- /dev/null
+++ b/fuzz/fuzz_targets/fuzz_simplify.rs
@@ -0,0 +1,13 @@
+use bolero::check;
+
+use deltachat::fuzzing::simplify;
+
+fn main() {
+    check!().for_each(|data: &[u8]| match String::from_utf8(data.to_vec()) {
+        Ok(input) => {
+            simplify(input.clone(), true);
+            simplify(input, false);
+        }
+        Err(_err) => {}
+    });
+}
diff --git a/src/fuzzing.rs b/src/fuzzing.rs
new file mode 100644
index 000000000..85634430c
--- /dev/null
+++ b/src/fuzzing.rs
@@ -0,0 +1,8 @@
+/// Fuzzing target for simplify().
+///
+/// Calls simplify() and panics if simplify() panics.
+/// Does not return any vaule to avoid exposing internal crate types.
+#[cfg(fuzzing)]
+pub fn simplify(mut input: String, is_chat_message: bool) {
+    crate::simplify::simplify(input, is_chat_message);
+}
diff --git a/src/lib.rs b/src/lib.rs
index a672ec7c0..c69fc8587 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -117,3 +117,6 @@ pub const DCC_MIME_DEBUG: &str = "DCC_MIME_DEBUG";
 mod test_utils;
 #[cfg(test)]
 mod tests;
+
+#[cfg(fuzzing)]
+pub mod fuzzing;