From 3c3648fd1db45d795de23a5eabb46b8daa4dab2e Mon Sep 17 00:00:00 2001
From: Markus Kusano <mukusano@gmail.com>
Date: Wed, 19 Dec 2018 23:20:49 -0500
Subject: [PATCH] Integrate libsass and add a fuzz target. (#2039)

---
 projects/libsass/Dockerfile             | 22 +++++++++++++++++
 projects/libsass/build.sh               | 26 ++++++++++++++++++++
 projects/libsass/data_context_fuzzer.cc | 32 +++++++++++++++++++++++++
 projects/libsass/project.yaml           | 13 ++++++++++
 4 files changed, 93 insertions(+)
 create mode 100644 projects/libsass/Dockerfile
 create mode 100755 projects/libsass/build.sh
 create mode 100644 projects/libsass/data_context_fuzzer.cc
 create mode 100644 projects/libsass/project.yaml

diff --git a/projects/libsass/Dockerfile b/projects/libsass/Dockerfile
new file mode 100644
index 000000000..93ad9874c
--- /dev/null
+++ b/projects/libsass/Dockerfile
@@ -0,0 +1,22 @@
+# Copyright 2018 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 gcr.io/oss-fuzz-base/base-builder
+RUN apt-get update && apt-get install -y make autoconf automake libtool
+RUN git clone --depth 1 https://github.com/sass/libsass.git libsass
+WORKDIR $SRC
+COPY build.sh $SRC/
+COPY data_context_fuzzer.cc $SRC/
diff --git a/projects/libsass/build.sh b/projects/libsass/build.sh
new file mode 100755
index 000000000..ee8866c45
--- /dev/null
+++ b/projects/libsass/build.sh
@@ -0,0 +1,26 @@
+#!/bin/bash -eu
+# Copyright 2018 Google Inc.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+################################################################################
+
+pushd libsass
+export BUILD='static'
+make -j$(nproc)
+popd
+
+INSTALL_DIR="$SRC/libsass"
+
+$CXX $CXXFLAGS -I${INSTALL_DIR}/include -lFuzzingEngine data_context_fuzzer.cc \
+  -o $OUT/data_context_fuzzer ${INSTALL_DIR}/lib/libsass.a
diff --git a/projects/libsass/data_context_fuzzer.cc b/projects/libsass/data_context_fuzzer.cc
new file mode 100644
index 000000000..310e43e7e
--- /dev/null
+++ b/projects/libsass/data_context_fuzzer.cc
@@ -0,0 +1,32 @@
+#include "sass.h"
+
+extern "C" int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
+  char* sass_data = (char*) malloc(sizeof(char) * size + 1);
+  if (sass_data == NULL) return 0;
+
+  memcpy(sass_data, data, size);
+  sass_data[size] = '\0';
+
+  struct Sass_Data_Context* ctx = sass_make_data_context(sass_data);
+  if (ctx == NULL) {
+    free(sass_data);
+    return 0;
+  }
+
+  struct Sass_Options* options = sass_make_options();
+  if (options == NULL) {
+    sass_delete_data_context(ctx);
+    return 0;
+  }
+
+  sass_option_set_output_style(options, SASS_STYLE_NESTED);
+  sass_option_set_precision(options, 5);
+
+  sass_data_context_set_options(ctx, options);
+  sass_compile_data_context(ctx);
+
+  sass_delete_data_context(ctx);
+  sass_delete_options(options);
+
+  return 0;
+}
diff --git a/projects/libsass/project.yaml b/projects/libsass/project.yaml
new file mode 100644
index 000000000..f8794866c
--- /dev/null
+++ b/projects/libsass/project.yaml
@@ -0,0 +1,13 @@
+homepage: "http://libsass.org/"
+primary_contact: "kusano@google.com"
+
+experimental: true
+
+sanitizers:
+  - address
+  - memory
+  - undefined
+
+labels:
+  data_context_fuzze:
+    - sundew