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Tolerate creation of InnocuousThreads - to facilitate use of java.lang.ref.Cleaner #77788 #77789

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Merged
merged 3 commits into from
Sep 16, 2021
Merged

Tolerate creation of InnocuousThreads - to facilitate use of java.lang.ref.Cleaner #77788 #77789

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311d318
Laxify SecureSM to allow creation of the JDK's innocuous threads
ChrisHegarty Sep 15, 2021
0bd6f60
Merge branch 'master' into innocuousThread
ChrisHegarty Sep 15, 2021
4536888
Merge branch 'master' into innocuousThread
elasticmachine Sep 16, 2021
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8 changes: 7 additions & 1 deletion libs/secure-sm/src/main/java/org/elasticsearch/secure_sm/SecureSM.java
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Original file line number Diff line number Diff line change
Expand Up @@ -154,6 +154,12 @@ private void debugThreadGroups(final ThreadGroup caller, final ThreadGroup targe
private static final Permission MODIFY_THREAD_PERMISSION = new RuntimePermission("modifyThread");
private static final Permission MODIFY_ARBITRARY_THREAD_PERMISSION = new ThreadPermission("modifyArbitraryThread");

// Returns true if the given thread is an instance of the JDK's InnocuousThread.
private static boolean isInnocuousThread(Thread t) {
final Class<?> c = t.getClass();
return c.getModule() == Object.class.getModule() && c.getName().equals("jdk.internal.misc.InnocuousThread");
}

protected void checkThreadAccess(Thread t) {
Objects.requireNonNull(t);

Expand All @@ -166,7 +172,7 @@ protected void checkThreadAccess(Thread t) {

if (target == null) {
return; // its a dead thread, do nothing.
} else if (source.parentOf(target) == false) {
} else if (source.parentOf(target) == false && isInnocuousThread(t) == false) {
checkPermission(MODIFY_ARBITRARY_THREAD_PERMISSION);
}
}
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