[libFuzzer] first steps in adding a proper automated test suite based on real-life code: add a script to build RE2 at a revision that has known bugs

llvm-svn: 282292

llvm/lib/Fuzzer/fuzzer-test-suite/re2-2014-12-09/build.sh

@@ -0,0 +1,21 @@
+#!/bin/bash
+
+[ -e $(basename $0) ] && echo "PLEASE USE THIS SCRIPT FROM ANOTHER DIR" && exit 1
+SCRIPT_DIR=$(dirname $0)
+LIBFUZZER_SRC=$(dirname $(dirname $SCRIPT_DIR))
+
+FUZZ_CXXFLAGS="-O2 -g -fsanitize=address -fsanitize-coverage=trace-pc-guard,trace-cmp,trace-gep,trace-div"
+
+get() {
+  [ ! -e SRC ] && git clone https://github.com/google/re2.git SRC && (cd SRC && git reset --hard 499ef7eff7455ce9c9fae86111d4a77b6ac335de)
+}
+build_lib() {
+  rm -rf BUILD
+  cp -rf SRC BUILD
+  (cd BUILD && make clean && CXX=clang++ CXXFLAGS="$FUZZ_CXXFLAGS"  make -j)
+}
+
+get
+build_lib
+$LIBFUZZER_SRC/build.sh
+clang++ -g $SCRIPT_DIR/target.cc -I  BUILD BUILD/obj/libre2.a libFuzzer.a  $FUZZ_CXXFLAGS

llvm/lib/Fuzzer/fuzzer-test-suite/re2-2014-12-09/target.cc

@@ -0,0 +1,27 @@
+#include <string>
+#include "re2/re2.h"
+
+extern "C" int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
+  if (size < 3) return 0;
+  uint16_t f = (data[0] << 16) + data[1];
+  RE2::Options opt;
+  opt.set_log_errors(false);
+  if (f & 1) opt.set_encoding(RE2::Options::EncodingLatin1);
+  opt.set_posix_syntax(f & 2);
+  opt.set_longest_match(f & 4);
+  opt.set_literal(f & 8);
+  opt.set_never_nl(f & 16);
+  opt.set_dot_nl(f & 32);
+  opt.set_never_capture(f & 64);
+  opt.set_case_sensitive(f & 128);
+  opt.set_perl_classes(f & 256);
+  opt.set_word_boundary(f & 512);
+  opt.set_one_line(f & 1024);
+  const char *b = reinterpret_cast<const char*>(data) + 2;
+  const char *e = reinterpret_cast<const char*>(data) + size;
+  std::string s1(b, e);
+  RE2 re(s1, opt);
+  if (re.ok())
+    RE2::FullMatch(s1, re);
+  return 0;
+}