ci: add afl fuzz stage

fuzz for 1 min to quickly detect e.g. incorrect asserts

.github/workflows/ci.yml

@@ -63,3 +63,18 @@ jobs:
           rustup component add clippy
       - name: "Check linting"
         run: make lint
+  fuzz:
+    name: Fuzz
+    runs-on: ubuntu-latest
+    steps:
+      - name: "Checkout"
+        uses: actions/checkout@v3
+      - name: "Setup toolchain"
+        run: |
+          rustup update nightly
+          rustup default nightly
+          cargo install afl
+      - name: "Fuzz"
+        run: |
+          echo core | sudo tee /proc/sys/kernel/core_pattern
+          make afl_quick

Makefile

@@ -68,6 +68,13 @@ afl:
 		trap - EXIT;\
 		cat) # keep process alive for trap
 
+afl_quick:
+	rm -rf tests/afl/out
+	(cd tests/afl && \
+		cargo afl build --release --config profile.release.debug-assertions=true && \
+		AFL_NO_UI=1 AFL_BENCH_UNTIL_CRASH=1 \
+			cargo afl fuzz -i in -o out -V 60 target/release/${AFL_TARGET})
+
 afl_crash:
 	set +e; \
 	for f in $$(find tests/afl/out -path '*/${AFL_TARGET_CRASH}/id*'); do \