jimfs: initial integration (#8483)

projects/jimfs/Dockerfile

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+# Copyright 2022 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-jvm
+
+RUN curl -L https://downloads.apache.org/maven/maven-3/3.6.3/binaries/apache-maven-3.6.3-bin.zip -o maven.zip && \
+    unzip maven.zip -d $SRC/maven && \
+    rm -rf maven.zip
+
+ENV MVN $SRC/maven/apache-maven-3.6.3/bin/mvn
+
+RUN git clone --depth 1 https://github.com/google/jimfs
+
+COPY build.sh $SRC/
+COPY *Fuzzer.java $SRC/
+WORKDIR $SRC/jimfs

projects/jimfs/FileSystemFuzzer.java

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+// Copyright 2022 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.
+//
+////////////////////////////////////////////////////////////////////////////////
+
+import com.code_intelligence.jazzer.api.FuzzedDataProvider;
+import com.code_intelligence.jazzer.api.FuzzerSecurityIssueLow;
+import com.google.common.collect.ImmutableList;
+import com.google.common.jimfs.Configuration;
+import com.google.common.jimfs.Jimfs;
+
+import java.io.IOException;
+import java.nio.charset.StandardCharsets;
+import java.nio.file.FileSystem;
+import java.nio.file.Files;
+import java.nio.file.InvalidPathException;
+import java.nio.file.Path;
+
+import static com.google.common.jimfs.PathNormalization.CASE_FOLD_UNICODE;
+import static com.google.common.jimfs.PathNormalization.NFD;
+
+public class FileSystemFuzzer {
+    public static void fuzzerTestOneInput(FuzzedDataProvider data) {
+        Configuration.Builder configBuilder;
+        if (data.consumeBoolean()) {
+            configBuilder = Configuration.unix().toBuilder();
+        } else {
+            configBuilder = Configuration.windows().toBuilder();
+        }
+
+        FileSystem fs;
+        try {
+            fs = Jimfs.newFileSystem(configBuilder
+                .setNameCanonicalNormalization(NFD, CASE_FOLD_UNICODE)
+                .setBlockSize(data.consumeInt(1, 1000))
+                .setMaxSize(data.consumeLong(1, 100000))
+                .setRoots(data.consumeString(50))
+                .setWorkingDirectory("/" + data.consumeString(50))
+                .setMaxCacheSize(data.consumeLong(1, 100000))
+                .setPathEqualityUsesCanonicalForm(data.consumeBoolean())
+                .build()
+            );
+        } catch (java.lang.IllegalArgumentException e) {
+            return;
+        }
+
+        Path foo;
+        try {
+            foo = fs.getPath(data.consumeString(50));
+        } catch (InvalidPathException e) {
+            return;
+        }
+
+        String content = data.consumeRemainingAsString();
+        try {
+            Files.createDirectory(foo);
+            Path dummyFile = foo.resolve("dummy.txt");
+            Files.write(dummyFile, ImmutableList.of(content), StandardCharsets.UTF_8);
+            String fileContent = Files.readString(dummyFile);
+            if (!fileContent.contains(content)) {
+                throw new FuzzerSecurityIssueLow("Content not entirely written to file");
+            }
+        } catch (IOException ignored) {}
+    }
+}

projects/jimfs/build.sh

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+#!/bin/bash -eu
+# Copyright 2022 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.
+#
+################################################################################
+
+MAVEN_ARGS="-Djavac.src.version=15 -Djavac.target.version=15 -DskipTests"
+$MVN package $MAVEN_ARGS org.apache.maven.plugins:maven-shade-plugin:3.2.4:shade
+CURRENT_VERSION=$($MVN org.apache.maven.plugins:maven-help-plugin:3.2.0:evaluate \
+ -Dexpression=project.version -q -DforceStdout)
+cp "jimfs/target/jimfs-$CURRENT_VERSION.jar" "$OUT/jimfs.jar"
+
+ALL_JARS="jimfs.jar"
+
+# The classpath at build-time includes the project jars in $OUT as well as the
+# Jazzer API.
+BUILD_CLASSPATH=$(echo $ALL_JARS | xargs printf -- "$OUT/%s:"):$JAZZER_API_PATH
+
+# All .jar and .class files lie in the same directory as the fuzzer at runtime.
+RUNTIME_CLASSPATH=$(echo $ALL_JARS | xargs printf -- "\$this_dir/%s:"):\$this_dir
+
+for fuzzer in $(find $SRC -name '*Fuzzer.java'); do
+  fuzzer_basename=$(basename -s .java $fuzzer)
+  javac -cp $BUILD_CLASSPATH $fuzzer
+  cp $SRC/$fuzzer_basename.class $OUT/
+
+  # Create an execution wrapper that executes Jazzer with the correct arguments.
+  echo "#!/bin/sh
+# LLVMFuzzerTestOneInput for fuzzer detection.
+this_dir=\$(dirname \"\$0\")
+LD_LIBRARY_PATH=\"$JVM_LD_LIBRARY_PATH\":\$this_dir \
+\$this_dir/jazzer_driver --agent_path=\$this_dir/jazzer_agent_deploy.jar \
+--cp=$RUNTIME_CLASSPATH \
+--target_class=$fuzzer_basename \
+--jvm_args=\"-Xmx2048m\" \
+\$@" > $OUT/$fuzzer_basename
+  chmod u+x $OUT/$fuzzer_basename
+done 

projects/jimfs/project.yaml

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+homepage: "https://github.com/google/jimfs"
+language: jvm
+main_repo: "git@github.com:google/jimfs.git"
+primary_contact: "cgdecker@google.com"
+fuzzing_engines:
+  - libfuzzer
+sanitizers:
+  - address
+vendor_ccs:
+  - "wagner@code-intelligence.com"
+  - "yakdan@code-intelligence.com"
+  - "glendowne@code-intelligence.com"
+  - "patrice.salathe@code-intelligence.com"
+  - "hlin@code-intelligence.com"
+  - "jacek.trossen@code-intelligence.com"