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undefect. CWE-407 — 63 sites patched across 27 ecosystems

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Authors: russell@unturf.com · brackishbert@gmail.com · foxhop.net · TimeHexOn.com

Patches, unit tests, benchmarks, whitepaper, and outreach briefs.
Public domain — no copyright claimed. Use freely.
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russell@unturf.com 2026-03-26 17:11:57 -04:00
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test/jdk/java/net/URLEncoder/SurrogatePairs.java Normal file
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/*
* Copyright (c) 2001, 2023, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
/*
* @test
* @bug 4396708
* @summary Test URL encoder and decoder on a string that contains
* surrogate pairs.
* @run junit SurrogatePairs
*/
import org.junit.jupiter.params.ParameterizedTest;
import org.junit.jupiter.params.provider.MethodSource;
import java.net.URLDecoder;
import java.net.URLEncoder;
import java.util.stream.Collectors;
import static java.nio.charset.StandardCharsets.UTF_8;
import static org.junit.jupiter.api.Assertions.*;
/*
* Surrogate pairs are two character Unicode sequences where the first
* character lies in the range [d800, dbff] and the second character lies
* in the range [dc00, dfff]. They are used as an escaping mechanism to add
* 1M more characters to Unicode.
*/
public class SurrogatePairs {
public static String[][] arguments() {
return new String[][] {
{"\uD800\uDC00", "%F0%90%80%80"},
{"\uD800\uDFFF", "%F0%90%8F%BF"},
{"\uDBFF\uDC00", "%F4%8F%B0%80"},
{"\uDBFF\uDFFF", "%F4%8F%BF%BF"},
{"1\uDBFF\uDC00", "1%F4%8F%B0%80"},
{"@\uDBFF\uDC00", "%40%F4%8F%B0%80"},
{"\uDBFF\uDC001", "%F4%8F%B0%801"},
{"\uDBFF\uDC00@", "%F4%8F%B0%80%40"},
{"\u0101\uDBFF\uDC00", "%C4%81%F4%8F%B0%80"},
{"\u0101\u0101\u0101\u0101\u0101\u0101\uDBFF\uDC00\u0101", "%C4%81%C4%81%C4%81%C4%81%C4%81%C4%81%F4%8F%B0%80%C4%81"},
{"\u0101\u0101\u0101\u0101\u0101\u0101\u0101\uDBFF\uDC00\u0101", "%C4%81%C4%81%C4%81%C4%81%C4%81%C4%81%C4%81%F4%8F%B0%80%C4%81"},
{"\u0101\u0101\u0101\u0101\u0101\u0101\u0101\u0101\uDBFF\uDC00\u0101", "%C4%81%C4%81%C4%81%C4%81%C4%81%C4%81%C4%81%C4%81%F4%8F%B0%80%C4%81"},
{"\uDBFF\uDC00\u0101", "%F4%8F%B0%80%C4%81"},
{"\uDE0A\uD83D", "%3F%3F"},
{"1\uDE0A\uD83D", "1%3F%3F"},
{"@\uDE0A\uD83D", "%40%3F%3F"},
{"1@1\uDE0A\uD800\uDC00 \uD83D", "1%401%3F%F0%90%80%80+%3F"}
};
}
@ParameterizedTest
@MethodSource("arguments")
public void test(String str, String correctEncoding) {
String encoded = URLEncoder.encode(str, UTF_8);
assertEquals(correctEncoding, encoded, () ->
"str=%s, expected=%s, actual=%s"
.formatted(escape(str), escape(correctEncoding), escape(encoded)));
// Map unmappable characters to '?'
String cleanStr = new String(str.getBytes(UTF_8), UTF_8);
String decoded = URLDecoder.decode(encoded, UTF_8);
assertEquals(cleanStr, decoded, () ->
"expected=%s, actual=%s".formatted(escape(str), escape(decoded)));
}
private static String escape(String s) {
return s.chars().mapToObj(c -> String.format("\\u%04x", c))
.collect(Collectors.joining());
}
}