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// Copyright 2022 Code Intelligence GmbH
//
// 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.
package com.example;
import com.code_intelligence.jazzer.api.FuzzedDataProvider;
import java.util.regex.Pattern;
/**
* Compiling a regex pattern can lead to stack overflows and thus is caught
* in the constructor of {@link java.util.regex.Pattern} and rethrown as a
* {@link java.util.regex.PatternSyntaxException}.
* The {@link com.code_intelligence.jazzer.sanitizers.RegexInjection} sanitizer
* uses this exception to detect injections and would incorrectly report a
* finding. Exceptions caused by stack overflows should not be handled in the
* hook as it's very unlikely that the fuzzer generates a pattern causing a
* stack overflow before it generates an invalid one.
*/
@SuppressWarnings({"ReplaceOnLiteralHasNoEffect", "ResultOfMethodCallIgnored"})
public class StackOverflowRegexInjection {
public static void fuzzerTestOneInput(FuzzedDataProvider ignored) {
// load regex classes by using them beforehand,
// otherwise initialization would cause other issues.
Pattern.compile("\n").matcher("some string").replaceAll("\\\\n");
generatePatternSyntaxException();
}
@SuppressWarnings("InfiniteRecursion")
private static void generatePatternSyntaxException() {
// try-catch on every level to not unwind the stack
try {
// generate stack overflow
generatePatternSyntaxException();
} catch (StackOverflowError e) {
// invoke regex injection hook
"some sting".replaceAll("\n", "\\\\n");
}
}
}
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