Add fuzz targets for tint (#6331)

Adds fuzz targets for the SPIR-V reader of the tint project.

projects/tint/Dockerfile

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+# Copyright 2021 Google LLC
+#
+# 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 ninja-build
+RUN git clone 'https://chromium.googlesource.com/chromium/tools/depot_tools.git' --depth 1
+ENV PATH="${SRC}/depot_tools:${PATH}"
+RUN git clone --depth 1 https://dawn.googlesource.com/tint tint
+WORKDIR tint
+COPY build.sh $SRC/

projects/tint/build.sh

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+#!/bin/bash -eu
+# Copyright 2021 Google LLC
+#
+# 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.
+#
+################################################################################
+
+cp standalone.gclient .gclient
+gclient sync
+
+mkdir -p out/Debug
+pushd out/Debug
+
+# ubsan's vptr sanitization is desabled as it requires RTTI, which is disabled
+# when building tint.
+CFLAGS="$CFLAGS -fno-sanitize=vptr" \
+CXXFLAGS="$CXXFLAGS -fno-sanitize=vptr" \
+cmake -GNinja ../.. -DTINT_BUILD_FUZZERS=ON -DTINT_BUILD_SPIRV_TOOLS_FUZZER=ON -DTINT_BUILD_TESTS=OFF
+
+SPIRV_FUZZERS="tint_spv_reader_fuzzer\
+ tint_spv_reader_msl_writer_fuzzer\
+ tint_spv_reader_wgsl_writer_fuzzer\
+ tint_spv_reader_hlsl_writer_fuzzer\
+ tint_spv_reader_spv_writer_fuzzer"
+
+# TODO(afd): add tint_spirv_tools_fuzzer
+
+# The spirv-as tool is used to build seed corpora
+ninja ${SPIRV_FUZZERS} spirv-as
+
+cp ${SPIRV_FUZZERS} $OUT
+
+popd
+
+# Generate a corpus of SPIR-V binaries from the SPIR-V assembly files in the
+# tint repository.
+mkdir $WORK/spirv-corpus
+python3 fuzzers/generate_spirv_corpus.py test $WORK/spirv-corpus out/Debug/spirv-as
+
+mkdir $WORK/spirv-corpus-hashed-names
+for f in `ls $WORK/spirv-corpus/*.spv`
+do
+  hashed_name=$(sha1sum "$f" | awk '{print $1}')
+  cp $f $WORK/spirv-corpus-hashed-names/$hashed_name
+done
+
+zip -j "$WORK/seed_corpus.zip" "$WORK"/spirv-corpus-hashed-names/*
+
+for fuzzer in $SPIRV_FUZZERS
+do
+  cp "$WORK/seed_corpus.zip" "$OUT/${fuzzer}_seed_corpus.zip"
+done

projects/tint/project.yaml

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+homepage: https://dawn.googlesource.com/tint
+language: c++
+primary_contact: bclayton@google.com 
+auto_ccs:
+  - "afdx@google.com"
+sanitizers:
+  - address
+  - memory
+  - undefined
+main_repo: 'https://dawn.googlesource.com/tint.git'
+architectures:
+  - x86_64
+  - i386