fix msan-problems in fuzzer-environment

.clusterfuzzlite/Dockerfile

@@ -1,7 +1,7 @@
 FROM gcr.io/oss-fuzz-base/base-builder:v1
 
 ENV CLUSTERFUZZLITE=TRUE
-RUN apt-get update && apt-get install -y bison libssl-dev libevent-dev libsystemd-dev
+RUN apt-get update && apt-get install -y bison libssl-dev libevent-dev
 COPY . $SRC/openiked-portable
 WORKDIR openiked-portable
 COPY .clusterfuzzlite/build.sh $SRC/

.clusterfuzzlite/build.sh

@@ -1,7 +1,7 @@
 #!/bin/bash -eu
 
 # build project
-cmake -S . -B build -DCMAKE_BUILD_TYPE=Release -DCLUSTERFUZZ=ON
+cmake -S . -B build -DCMAKE_BUILD_TYPE=DEBUG -DCLUSTERFUZZ=ON
 cmake --build build
 
 # copy binary and dict to $OUT

CMakeLists.txt

@@ -409,7 +409,7 @@ if(CLUSTERFUZZ)
 	add_subdirectory(regress/parser-libfuzzer)
 	if (NOT DEFINED ENV{CLUSTERFUZZLITE})
 		set(CMAKE_C_COMPILER clang)
-		string(APPEND CMAKE_C_FLAGS " -g -O1 -fsanitize=fuzzer-no-link")
+		string(APPEND CMAKE_C_FLAGS " -g -O0 -fsanitize=fuzzer-no-link")
 	endif()
 endif()
 add_subdirectory(compat)

regress/parser-libfuzzer/common.c

@@ -12,6 +12,7 @@
 
 #include <event.h>
 #include <limits.h>
+#include <string.h>
 
 #include "iked.h"
 #include "types.h"
@@ -162,6 +163,7 @@ ssize_t
 ikev2_nat_detection(struct iked *env, struct iked_message *msg,
     void *ptr, size_t len, u_int type, int frompeer)
 {
+	bzero(ptr, len);
 	return (0);
 }
 

regress/parser-libfuzzer/run_test.sh

@@ -1,6 +1,7 @@
 #!/bin/sh
 
 # script to run the parser-fuzzer for 5 minutes with the right options
+# use repo github.com/openiked/openiked-fuzzing/corpus/test_libfuzzer as corpus for faster results
 
 # ASAN-option to help finding the source of memory leaks
 export ASAN_OPTIONS=fast_unwind_on_malloc=0