From c69f27916991b6cde7b20772ca5a96863b4ef67b Mon Sep 17 00:00:00 2001
From: Kostya Serebryany <konstantin.s.serebryany@gmail.com>
Date: Wed, 12 Oct 2016 20:45:44 -0700
Subject: [PATCH] pcre2 fuzzer (#24)

---
 pcre2/Dockerfile      | 21 +++++++++++++++++++++
 pcre2/Jenkinsfile     | 23 +++++++++++++++++++++++
 pcre2/build.sh        | 33 +++++++++++++++++++++++++++++++++
 pcre2/pcre2_fuzzer.cc | 21 +++++++++++++++++++++
 4 files changed, 98 insertions(+)
 create mode 100644 pcre2/Dockerfile
 create mode 100644 pcre2/Jenkinsfile
 create mode 100755 pcre2/build.sh
 create mode 100644 pcre2/pcre2_fuzzer.cc

diff --git a/pcre2/Dockerfile b/pcre2/Dockerfile
new file mode 100644
index 000000000..ac0442ce5
--- /dev/null
+++ b/pcre2/Dockerfile
@@ -0,0 +1,21 @@
+# Copyright 2016 Google Inc.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+################################################################################
+
+FROM ossfuzz/base-libfuzzer
+MAINTAINER kcc@google.com
+RUN apt-get install -y make autoconf automake libtool subversion
+
+COPY build.sh /src/
diff --git a/pcre2/Jenkinsfile b/pcre2/Jenkinsfile
new file mode 100644
index 000000000..987499d21
--- /dev/null
+++ b/pcre2/Jenkinsfile
@@ -0,0 +1,23 @@
+// Copyright 2016 Google Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+////////////////////////////////////////////////////////////////////////////////
+
+def libfuzzerBuild = fileLoader.fromGit('infra/libfuzzer-pipeline.groovy',
+                                        'https://github.com/google/oss-fuzz.git')
+
+libfuzzerBuild {
+  // the real source is in svn
+  git = "https://github.com/google/oss-fuzz.git"
+}
diff --git a/pcre2/build.sh b/pcre2/build.sh
new file mode 100755
index 000000000..f7cb26279
--- /dev/null
+++ b/pcre2/build.sh
@@ -0,0 +1,33 @@
+#!/bin/bash -eu
+# Copyright 2016 Google Inc.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+################################################################################
+
+cd /src/pcre2
+svn co svn://vcs.exim.org/pcre2/code/trunk pcre2
+cd pcre2
+
+# build the library.
+./autogen.sh
+SAVED_LDFLAGS="$LDFLAGS"
+export LDFLAGS=  # Can't use provided LDFLAGS to build pcre's .a targets.
+./configure --enable-never-backslash-C --with-match-limit=1000 --with-match-limit-recursion=1000
+make clean all
+
+# Build the target.
+$CXX $CXXFLAGS -std=c++11 -I src  \
+     /src/oss-fuzz/pcre2/pcre2_fuzzer.cc -o /out/pcre2_fuzzer \
+     -Wl,--whole-archive .libs/*.a -Wl,-no-whole-archive $SAVED_LDFLAGS \
+     /work/libfuzzer/*.o
diff --git a/pcre2/pcre2_fuzzer.cc b/pcre2/pcre2_fuzzer.cc
new file mode 100644
index 000000000..f6fb828a3
--- /dev/null
+++ b/pcre2/pcre2_fuzzer.cc
@@ -0,0 +1,21 @@
+// Copyright 2016 Google Inc. All Rights Reserved.
+// Licensed under the Apache License, Version 2.0 (the "License");
+
+#include <string>
+#include "pcre2posix.h"
+
+using std::string;
+
+extern "C" int LLVMFuzzerTestOneInput(const unsigned char *data, size_t size) {
+  if (size < 1) return 0;
+  regex_t preg;
+  string str(reinterpret_cast<const char*>(data), size);
+  string pat(str);
+  int flags = data[size/2] - 'a';  // Make it 0 when the byte is 'a'.
+  if (0 == regcomp(&preg, pat.c_str(), flags)) {
+    regmatch_t pmatch[5];
+    regexec(&preg, str.c_str(), 5, pmatch, 0);
+    regfree(&preg);
+  }
+  return 0;
+}