From 2d0b3ec6a2f021b233f776d623fdfad8e07fb44c Mon Sep 17 00:00:00 2001
From: Erik Boasson <eb@ilities.com>
Date: Mon, 15 Apr 2024 15:34:51 +0200
Subject: [PATCH] Some extra scripting for dealing with fuzzers

* check.sh: uses the oss-fuzz infrastructure scripts to run over various fuzzing engines,
  trying to build the fuzzers and run a sanity check on them
* local.sh: builds the fuzzers locally with some minor assumptions on locations

Signed-off-by: Erik Boasson <eb@ilities.com>
---
 fuzz/check.sh                  | 26 ++++++++++++++++++
 fuzz/local.sh                  | 48 ++++++++++++++++++++++++++++++++++
 src/core/xtests/CMakeLists.txt |  2 +-
 3 files changed, 75 insertions(+), 1 deletion(-)
 create mode 100755 fuzz/check.sh
 create mode 100644 fuzz/local.sh

diff --git a/fuzz/check.sh b/fuzz/check.sh
new file mode 100755
index 0000000000..3e7463aeb3
--- /dev/null
+++ b/fuzz/check.sh
@@ -0,0 +1,26 @@
+#!/usr/bin/bash
+
+if [ ! -f "infra/helper.py" ] ; then
+  echo "this script must be executed in the oss-fuzz directory" 2>&1
+  exit 33
+fi
+
+if [ "$1" = "build-image" ] ; then
+  shift
+  python3 infra/helper.py build_image cyclonedds
+fi
+
+if [ ! -d "$1" -o ! -f "$1/src/core/ddsi/src/ddsi_init.c" ] ; then
+  echo "usage: $0 [build-image] cyclone-source-dir" 2>&1
+  exit 33
+fi
+srcdir="$1"
+
+set -x
+engines="libfuzzer afl honggfuzz centipede"
+for eng in $engines ; do
+  echo "********** ENGINE = $eng **********"
+  sudo rm -rf $srcdir/{build,install,build_python}
+  python3 infra/helper.py build_fuzzers --sanitizer address --engine $eng cyclonedds $srcdir || break
+  python3 infra/helper.py check_build --engine $eng cyclonedds || break
+done
diff --git a/fuzz/local.sh b/fuzz/local.sh
new file mode 100644
index 0000000000..fcde516a59
--- /dev/null
+++ b/fuzz/local.sh
@@ -0,0 +1,48 @@
+#!/usr/bin/bash
+
+# Local build
+#
+# sudo apt install clang libfuzzer-14-dev (replace 14 with clang version)
+
+set -ex
+
+if [ ! -f ../src/core/ddsi/src/ddsi_receive.c -o ! -d ../fuzz ] ; then
+    echo "This expects to be run in a build directory that is a subdirectory of the Cyclone repo" 2>&1
+    exit 1
+fi
+if [ -z "$CYCLONEDDS_HOME" ] ; then
+    echo "Need CYCLONEDDS_HOME to be set" 2>&1
+fi
+if [ -z "$CYCLONEDDS_PYTHON" -o ! -d "$CYCLONEDDS_PYTHON/tests/support_modules/fuzz_tools" ] ; then
+    echo "need CYCLONEDDS_PYTHON to point to the cyclone python binding sources" 2>&1
+    exit 1
+fi
+
+export PATH="$CYCLONEDDS_HOME/bin:$PATH"
+export LD_LIBRARY_PATH="$CYCLONEDDS_HOME/lib${LD_LIBRARY_PATH:+:$LD_LIBRARY_PATH}"
+export PATH="$CYCLONEDDS_HOME/lib:$PATH"
+export PYTHONPATH="$CYCLONEDDS_PYTHON/tests/support_modules${PYTHONPATH:+:$PYTHONPATH}"
+
+# Use current git HEAD hash as seed
+[ -z "$SEED" ] && SEED=$(git ls-remote https://github.com/eclipse-cyclonedds/cyclonedds HEAD |cut -f1)
+python3 "../fuzz/fuzz_sample_deser/generate_idl.py" $SEED "../fuzz/fuzz_sample_deser"
+
+export CC=clang
+export CXX=clang++
+export LIB_FUZZING_ENGINE=/usr/lib/llvm-14/lib/libFuzzer.a
+
+cmake -G Ninja \
+      -DSANITIZER=address,undefined,fuzzer \
+      -DEXPORT_ALL_SYMBOLS=ON \
+      -DBUILD_SHARED_LIBS=OFF \
+      -DBUILD_EXAMPLES=NO \
+      -DENABLE_SECURITY=ON \
+      -DENABLE_SSL=NO \
+      -DCMAKE_POSITION_INDEPENDENT_CODE=ON \
+      -DBUILD_IDLC=NO \
+      -DBUILD_DDSPERF=NO \
+      -DCMAKE_BUILD_TYPE=Debug \
+      -DCMAKE_PREFIX_PATH=$PWD/host_install \
+      -DCMAKE_INSTALL_PREFIX=$PWD/install ..
+
+cmake --build .
diff --git a/src/core/xtests/CMakeLists.txt b/src/core/xtests/CMakeLists.txt
index 406a625782..e913404409 100644
--- a/src/core/xtests/CMakeLists.txt
+++ b/src/core/xtests/CMakeLists.txt
@@ -15,6 +15,6 @@ if(BUILD_TESTING AND BUILD_IDLC)
     add_subdirectory(initsampledeliv)
 endif()
 
-if(NOT CMAKE_CROSSCOMPILING AND NOT CMAKE_SYSTEM_NAME MATCHES "iOS")
+if(NOT CMAKE_CROSSCOMPILING AND NOT CMAKE_SYSTEM_NAME MATCHES "iOS" AND NOT DEFINED ENV{LIB_FUZZING_ENGINE})
     add_subdirectory(symbol_export)
 endif()