engineering/java-topology
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

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

Browse source 
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.
This commit is contained in:
russell@unturf.com 2026-03-26 17:11:57 -04:00
commit 0a580b313d
70422 changed files with 17213626 additions and 0 deletions
Download patch file Download diff file Expand all files Collapse all files

231
test/hotspot/jtreg/runtime/Thread/TooSmallStackSize.java Normal file
View file

@ -0,0 +1,231 @@
/*
* Copyright (c) 2016, 2025, 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 8140520
* @summary Setting small CompilerThreadStackSize, ThreadStackSize, and
* VMThreadStackSize values should result in an error message that shows
* the minimum stack size value for each thread type.
* @library /test/lib
* @requires vm.flagless
* @modules java.base/jdk.internal.misc
* java.management
* @run driver TooSmallStackSize
*/
/*
* The primary purpose of this test is to make sure we can run with a
* stack smaller than the minimum without crashing. Also this test will
* determine the minimum allowed stack size for the platform (as
* provided by the JVM error message when a very small stack is used),
* and then verify that the JVM can be launched with that stack size
* without a crash or any error messages.
*
* Note: The '-Xss<size>' and '-XX:ThreadStackSize=<k-bytes>' options
* both control Java thread stack size. This repo's version of the test
* exercises the '-XX:ThreadStackSize' VM option. The jdk repo's version
* of the test exercises the '-Xss' option.
*/
import jdk.test.lib.process.ProcessTools;
import jdk.test.lib.process.OutputAnalyzer;
public class TooSmallStackSize {
/* for debugging. Normally false. */
static final boolean verbose = false;
static final String CompilerThreadStackSizeString = "CompilerThreadStackSize";
static final String ThreadStackSizeString = "Java thread stack size";
static final String VMThreadStackSizeString = "VMThreadStackSize";
static String testShadowSize = null;
/*
* Returns the minimum stack size this platform will allowed based on the
* contents of the error message the JVM outputs when too small of a
* stack size was used.
*
* The testOutput argument must contain the result of having already run
* the JVM with too small of a stack size.
*/
static String getMinStackAllowed(String testOutput) {
/*
* The JVM output will contain in one of the lines:
* "The CompilerThreadStackSize specified is too small. Specify at least 100k"
* "The Java thread stack size specified is too small. Specify at least 100k"
* "The VMThreadStackSize specified is too small. Specify at least 100k"
* Although the actual size will vary. We need to extract this size
* string from the output and return it.
*/
String matchStr = "Specify at least ";
int match_idx = testOutput.indexOf(matchStr);
if (match_idx >= 0) {
int size_start_idx = match_idx + matchStr.length();
int k_start_idx = testOutput.indexOf("k", size_start_idx);
// don't include the 'k'; the caller will have to
// add it back as needed.
return testOutput.substring(size_start_idx, k_start_idx);
}
System.out.println("Expect='" + matchStr + "'");
System.out.println("Actual: " + testOutput);
System.out.println("FAILED: Could not get the stack size from the output");
throw new RuntimeException("test fails");
}
static ProcessBuilder createProcessWithOptions(String stackOption, String stackSize) throws Exception {
if (testShadowSize == null) {
return ProcessTools.createLimitedTestJavaProcessBuilder(
stackOption + stackSize,
// Uncomment the following to get log output
// that shows actual thread creation sizes.
// "-Xlog:os+thread",
"-version");
} else {
return ProcessTools.createLimitedTestJavaProcessBuilder(
stackOption + stackSize,
// Uncomment the following to get log output
// that shows actual thread creation sizes.
// "-Xlog:os+thread",
"-XX:StackShadowPages=" + testShadowSize,
"-version");
}
}
/*
* Run the JVM with the specified stack size.
*
* Returns the minimum allowed stack size gleaned from the error message,
* if there is an error message. Otherwise returns the stack size passed in.
*/
static String checkStack(String stackOption, String optionMesg, String stackSize) throws Exception {
String min_stack_allowed;
System.out.println("*** Testing " + stackOption + stackSize);
ProcessBuilder pb = createProcessWithOptions(stackOption, stackSize);
OutputAnalyzer output = new OutputAnalyzer(pb.start());
if (verbose) {
System.out.println("stdout: " + output.getStdout());
}
if (output.getExitValue() == 0) {
// checkMinStackAllowed() is called with stackSize values
// that should be the minimum that works. This method,
// checkStack(), is called with stackSize values that
// should be too small and result in error messages.
// However, some platforms fix up a stackSize value that is
// too small into something that works so we have to allow
// for checkStack() calls that work.
System.out.println("PASSED: got exit_code == 0 with " + stackOption + stackSize);
min_stack_allowed = stackSize;
} else {
String expect = "The " + optionMesg + " specified is too small";
if (verbose) {
System.out.println("Expect='" + expect + "'");
}
output.shouldContain(expect);
min_stack_allowed = getMinStackAllowed(output.getStdout());
System.out.println("PASSED: got expected error message with " + stackOption + stackSize);
}
return min_stack_allowed;
}
/*
* Run the JVM with the minimum allowed stack size. This should always succeed.
*/
static void checkMinStackAllowed(String stackOption, String optionMesg, String stackSize) throws Exception {
System.out.println("*** Testing " + stackOption + stackSize);
ProcessBuilder pb = createProcessWithOptions(stackOption, stackSize);
OutputAnalyzer output = new OutputAnalyzer(pb.start());
output.shouldHaveExitValue(0);
System.out.println("PASSED: VM launched with " + stackOption + stackSize);
}
public static void test(String... args) throws Exception {
/*
* The result of a 16k stack size should be a quick exit with a complaint
* that the stack size is too small. However, for some win32 builds, the
* stack is always at least 64k, and this also sometimes is the minimum
* allowed size, so we won't see an error in this case.
*
* This test case will also produce a crash on some platforms if the fix
* for 6762191 is not yet in place.
*/
checkStack("-XX:ThreadStackSize=", ThreadStackSizeString, "16");
/*
* Try with a 64k stack size, which is the size that the launcher will
* set to if you try setting to anything smaller. This should produce the same
* result as setting to 16k if the fix for 6762191 is in place.
*/
String min_stack_allowed = checkStack("-XX:ThreadStackSize=", ThreadStackSizeString, "64");
/*
* Try again with the minimum stack size that was given in the error message
*/
checkMinStackAllowed("-XX:ThreadStackSize=", ThreadStackSizeString, min_stack_allowed);
/*
* Now try with a stack size that is not page aligned.
*/
checkMinStackAllowed("-XX:ThreadStackSize=", ThreadStackSizeString, "513");
/*
* Try with 0k which indicates that the default thread stack size from JVM will be used.
*/
checkMinStackAllowed("-XX:ThreadStackSize=", ThreadStackSizeString, "0");
/*
* Now redo the same tests with the compiler thread stack size:
*/
checkStack("-XX:CompilerThreadStackSize=", CompilerThreadStackSizeString, "16");
min_stack_allowed = checkStack("-XX:CompilerThreadStackSize=", CompilerThreadStackSizeString, "64");
checkMinStackAllowed("-XX:CompilerThreadStackSize=", CompilerThreadStackSizeString, min_stack_allowed);
checkMinStackAllowed("-XX:CompilerThreadStackSize=", CompilerThreadStackSizeString, "513");
checkMinStackAllowed("-XX:CompilerThreadStackSize=", CompilerThreadStackSizeString, "0");
/*
* Now redo the same tests with the VM thread stack size:
*/
checkStack("-XX:VMThreadStackSize=", VMThreadStackSizeString, "16");
min_stack_allowed = checkStack("-XX:VMThreadStackSize=", VMThreadStackSizeString, "64");
checkMinStackAllowed("-XX:VMThreadStackSize=", VMThreadStackSizeString, min_stack_allowed);
checkMinStackAllowed("-XX:VMThreadStackSize=", VMThreadStackSizeString, "513");
checkMinStackAllowed("-XX:VMThreadStackSize=", VMThreadStackSizeString, "0");
}
// aarch64 StackShadowPage size range is 25-55
static String shadowSizes[] = { null, "30" };
public static void main(java.lang.String[] unused) throws Exception {
for (String sz : shadowSizes) {
testShadowSize = sz;
test();
}
}
}