CI: speedups and fixes (#855)

* scripts/clippy.sh: remove cargo clean step

Clippy used to only report warnings in code that was not part of the
incremental cache. This has changed since and I believe we can safely
drop the `cargo clean` step.

* Revert "ci: install z3 to avoid building from source"

This reverts commit 6ff1c4088811040dcfdbd12273f0baf507a4308b.
This doesn't do anything as we're using `static-link-z3` explicitly.

* refactor test_all_fuzzers

nyx tests were not included in `time_record` before this

* nyx fuzzer: move modprobe logic out of setup_libxml2.sh

.github/workflows/build_and_test.yml

@@ -156,7 +156,7 @@ jobs:
     - uses: lyricwulf/abc@v1
       with: 
         # todo: remove afl++-clang when nyx support samcov_pcguard
-        linux: llvm llvm-dev clang nasm ninja-build gcc-arm-linux-gnueabi g++-arm-linux-gnueabi libgtk-3-dev afl++-clang pax-utils z3 libz3-dev
+        linux: llvm llvm-dev clang nasm ninja-build gcc-arm-linux-gnueabi g++-arm-linux-gnueabi libgtk-3-dev afl++-clang pax-utils
         # update bash for macos to support `declare -A` command`
         macos: llvm libpng nasm coreutils z3 bash
     - name: pip install

fuzzers/nyx_libxml2_parallel/Makefile.toml

@@ -28,6 +28,18 @@ script='''
 ./setup_libxml2.sh
 '''
 
+[tasks.enable_kvm_vmware_hypercall]
+script_runner = "@shell"
+script='''
+if [ ! -e /sys/module/kvm/parameters/enable_vmware_backdoor ] ||
+  ! grep -qF Y /sys/module/kvm/parameters/enable_vmware_backdoor; then
+  sudo modprobe -r kvm-intel # or kvm-amd for AMD
+  sudo modprobe -r kvm
+  sudo modprobe kvm enable_vmware_backdoor=y
+  sudo modprobe kvm-intel
+fi;
+'''
+
 # Run the fuzzer
 [tasks.run]
 linux_alias = "run_unix"
@@ -39,7 +51,7 @@ script_runner = "@shell"
 script='''
 cargo run
 '''
-dependencies = [ "libxml2" ]
+dependencies = [ "libxml2", "enable_kvm_vmware_hypercall" ]
 
 # Clean up
 [tasks.clean]

fuzzers/nyx_libxml2_parallel/setup_libxml2.sh

@@ -23,7 +23,3 @@ python3 "../../libafl_nyx/packer/packer/nyx_packer.py" \
     --purge || exit
 
 python3 ../../libafl_nyx/packer/packer/nyx_config_gen.py /tmp/nyx_libxml2/ Kernel || exit
-sudo modprobe -r kvm-intel # or kvm-amd for AMD 
-sudo modprobe -r kvm
-sudo modprobe kvm enable_vmware_backdoor=y
-sudo modprobe kvm-intel

fuzzers/nyx_libxml2_standalone/Makefile.toml

@@ -28,6 +28,18 @@ script='''
 ./setup_libxml2.sh
 '''
 
+[tasks.enable_kvm_vmware_hypercall]
+script_runner = "@shell"
+script='''
+if [ ! -e /sys/module/kvm/parameters/enable_vmware_backdoor ] ||
+  ! grep -qF Y /sys/module/kvm/parameters/enable_vmware_backdoor; then
+  sudo modprobe -r kvm-intel # or kvm-amd for AMD
+  sudo modprobe -r kvm
+  sudo modprobe kvm enable_vmware_backdoor=y
+  sudo modprobe kvm-intel
+fi;
+'''
+
 # Run the fuzzer
 [tasks.run]
 linux_alias = "run_unix"
@@ -39,7 +51,7 @@ script_runner = "@shell"
 script='''
 cargo run
 '''
-dependencies = [ "libxml2" ]
+dependencies = [ "libxml2", "enable_kvm_vmware_hypercall" ]
 
 # Clean up
 [tasks.clean]

fuzzers/nyx_libxml2_standalone/setup_libxml2.sh

@@ -21,9 +21,3 @@ python3 "../../libafl_nyx/packer/packer/nyx_packer.py" \
     -file "/tmp/input" \
     --fast_reload_mode \
     --purge || exit
-
-python3 ../../libafl_nyx/packer/packer/nyx_config_gen.py /tmp/nyx_libxml2/ Kernel || exit
-sudo modprobe -r kvm-intel # or kvm-amd for AMD 
-sudo modprobe -r kvm
-sudo modprobe kvm enable_vmware_backdoor=y
-sudo modprobe kvm-intel

scripts/clippy.sh

@@ -2,12 +2,6 @@
 SCRIPT_DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" &> /dev/null && pwd )"
 cd "$SCRIPT_DIR/.." || exit 1
 
-# Clippy checks
-if [ "$1" != "--no-clean" ]; then
-   # Usually, we want to clean, since clippy won't work otherwise.
-   echo "[+] Cleaning up previous builds..."
-   cargo clean -p libafl
-fi
 RUST_BACKTRACE=full cargo +nightly clippy --all --all-features --release --tests -- -Z macro-backtrace \
    -D clippy::all \
    -D clippy::pedantic \

scripts/test_all_fuzzers.sh

@@ -10,6 +10,9 @@ backtrace_fuzzers=$(find ./fuzzers/backtrace_baby_fuzzers -mindepth 1 -maxdepth
 
 libafl=$(pwd)
 
+# build with a shared target dir for all fuzzers. this should speed up
+# compilation a bit, and allows for easier artifact management (caching and
+# cargo clean).
 export CARGO_TARGET_DIR="$libafl/target"
 mkdir -p "$CARGO_TARGET_DIR"
 
@@ -34,23 +37,8 @@ declare -A time_record || (echo "declare -A not avaliable, please update your ba
 # shellcheck disable=SC2116
 for fuzzer in $(echo "$fuzzers" "$backtrace_fuzzers");
 do
-    # for nyx examples
-    if [[ $fuzzer == *"nyx_"* ]]; then
-    
-    	# only test on linux
-    	if [[ $(uname -s) == "Linux" ]]; then
-		    cd "$fuzzer" || exit 1
-			if [ "$1" != "--no-fmt" ]; then
-			    echo "[*] Checking fmt for $fuzzer"
-			    cargo fmt --all -- --check || exit 1
-			    echo "[*] Running clippy for $fuzzer"
-			    cargo clippy || exit 1
-			else
-			    echo "[+] Skipping fmt and clippy for $fuzzer (--no-fmt specified)"
-			fi
-            cargo make build
-		    cd - || exit
-	    fi
+    # skip nyx test on non-linux platforms
+    if [[ $fuzzer == *"nyx_"* ]] && [[ $(uname -s) != "Linux" ]]; then
         continue
     fi
 
@@ -67,7 +55,11 @@ do
         echo "[+] Skipping fmt and clippy for $fuzzer (--no-fmt specified)"
     fi
     
-    if [ -e ./Makefile.toml ]; then
+    if [ -e ./Makefile.toml ] && grep -qF "skip_core_tasks = true" Makefile.toml; then
+        echo "[*] Building $fuzzer (running tests is not supported in this context)"
+        cargo make build || exit 1
+        echo "[+] Done building $fuzzer"
+    elif [ -e ./Makefile.toml ]; then
         echo "[*] Testing $fuzzer"
         cargo make test || exit 1
         echo "[+] Done testing $fuzzer"
@@ -82,7 +74,7 @@ do
     # Save disk space
     cargo clean -p "$(basename "$fuzzer")"
     cargo clean --release -p "$(basename "$fuzzer")" 2> /dev/null
-    # Leaving these in the cache results in lots of duplicate build artefacts
+    # Leaving these in the cache results in lots of duplicate build artifacts
     # (many different feature flag combinations, ...), so let's prune them.
     for clean_pkgid in libafl libafl_targets libafl_sugar; do
         cargo clean -p "$clean_pkgid" 2> /dev/null