[mupdf] Add mupdf fuzzer (#1067)

* Add fuzzer for mupdf

* Address review comments

* Add check to ensure corpus/dict exist

* Silence stderr spam

* Update fuzzer based on review comments

* Enable MemorySanitizer

* Set primary contact

projects/mupdf/Dockerfile

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+# 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
+MAINTAINER jonathan@titanous.com
+RUN apt-get update && apt-get install -y make libtool pkg-config
+RUN git clone --recursive --depth 1 git://git.ghostscript.com/mupdf.git mupdf
+RUN git clone --depth 1 https://github.com/mozilla/pdf.js pdf.js && \
+    zip -q $SRC/pdf_fuzzer_seed_corpus.zip pdf.js/test/pdfs/*.pdf && \
+    rm -rf pdf.js
+ADD https://raw.githubusercontent.com/rc0r/afl-fuzz/master/dictionaries/pdf.dict $SRC/pdf_fuzzer.dict
+WORKDIR mupdf
+COPY *.cc source/fuzz/
+COPY build.sh *.options $SRC/

projects/mupdf/build.sh

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+#!/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.
+#
+################################################################################
+
+LDFLAGS="$CXXFLAGS" make -j$(nproc) HAVE_GLUT=no build=debug OUT=$WORK
+fuzz_target=pdf_fuzzer
+
+$CXX $CXXFLAGS -std=c++11 -Iinclude \
+    source/fuzz/pdf_fuzzer.cc -o $OUT/$fuzz_target \
+    -lFuzzingEngine $WORK/libmupdf.a $WORK/libmupdfthird.a
+
+mv $SRC/{*.zip,*.dict,*.options} $OUT
+
+if [ ! -f "${OUT}/${fuzz_target}_seed_corpus.zip" ]; then
+  echo "missing seed corpus"
+  exit 1
+fi
+
+if [ ! -f "${OUT}/${fuzz_target}.dict" ]; then
+  echo "missing dictionary"
+  exit 1
+fi
+
+if [ ! -f "${OUT}/${fuzz_target}.options" ]; then
+  echo "missing options"
+  exit 1
+fi

projects/mupdf/pdf_fuzzer.cc

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+/*
+# 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.
+#
+################################################################################
+*/
+
+#include <cstdint>
+
+#include <mupdf/fitz.h>
+
+extern "C" int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
+  fz_context *ctx = fz_new_context(nullptr, nullptr, FZ_STORE_DEFAULT);
+
+  fz_stream *stream = fz_open_memory(ctx, data, size);
+  fz_matrix ctm;
+  fz_pixmap *pix;
+  fz_try(ctx) {
+    fz_document *doc = fz_open_document_with_stream(ctx, "pdf", stream);
+    for (int i = 0; i < fz_count_pages(ctx, doc); i++) {
+      pix = fz_new_pixmap_from_page_number(ctx, doc, i, &ctm, fz_device_rgb(ctx), 0);
+      fz_drop_pixmap(ctx, pix);
+    }
+    fz_drop_document(ctx, doc);
+  }
+  fz_catch(ctx) {}
+
+  fz_drop_stream(ctx, stream);
+  fz_drop_context(ctx);
+
+  return 0;
+}

projects/mupdf/pdf_fuzzer.options

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+[libfuzzer]
+close_fd_mask = 3

projects/mupdf/project.yaml

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+homepage: "https://www.mupdf.com"
+primary_contact: tor.andersson@artifex.com
+sanitizers:
+  - address
+  - undefined
+  - memory
+auto_ccs:
+  - jonathan@titanous.com