diff --git a/test/hotspot/jtreg/serviceability/sa/ClhsdbLauncher.java b/test/hotspot/jtreg/serviceability/sa/ClhsdbLauncher.java
index 2eb6d5ccd57..a21035a64c8 100644
--- a/test/hotspot/jtreg/serviceability/sa/ClhsdbLauncher.java
+++ b/test/hotspot/jtreg/serviceability/sa/ClhsdbLauncher.java
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2017, 2019, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2017, 2020, 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
@@ -197,10 +197,14 @@ public String run(long lingeredAppPid,
         throws Exception {
 
         if (!Platform.shouldSAAttach()) {
-            if (Platform.isOSX() && SATestUtils.canAddPrivileges()) {
-                needPrivileges = true;
+            if (Platform.isOSX()) {
+                if (Platform.isSignedOSX()) {
+                    throw new SkippedException("SA attach not expected to work. JDK is signed.");
+                } else if (SATestUtils.canAddPrivileges()) {
+                    needPrivileges = true;
+                }
             }
-            else {
+            if (!needPrivileges)  {
                // Skip the test if we don't have enough permissions to attach
                // and cannot add privileges.
                throw new SkippedException(
diff --git a/test/hotspot/jtreg/testlibrary_tests/TestMutuallyExclusivePlatformPredicates.java b/test/hotspot/jtreg/testlibrary_tests/TestMutuallyExclusivePlatformPredicates.java
index 11e34465b06..b9547b6586f 100644
--- a/test/hotspot/jtreg/testlibrary_tests/TestMutuallyExclusivePlatformPredicates.java
+++ b/test/hotspot/jtreg/testlibrary_tests/TestMutuallyExclusivePlatformPredicates.java
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2014, 2019, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2014, 2020, 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
@@ -52,7 +52,8 @@ private static enum MethodGroup {
         MODE("isInt", "isMixed", "isComp"),
         IGNORED("isEmulatedClient", "isDebugBuild", "isFastDebugBuild",
                 "isSlowDebugBuild", "hasSA", "shouldSAAttach", "isTieredSupported",
-                "areCustomLoadersSupportedForCDS", "isDefaultCDSArchiveSupported");
+                "areCustomLoadersSupportedForCDS", "isDefaultCDSArchiveSupported",
+                "isSignedOSX");
 
         public final List<String> methodNames;
 
diff --git a/test/lib/jdk/test/lib/Platform.java b/test/lib/jdk/test/lib/Platform.java
index 4327f1bc2bb..d29ac66dea3 100644
--- a/test/lib/jdk/test/lib/Platform.java
+++ b/test/lib/jdk/test/lib/Platform.java
@@ -24,10 +24,12 @@
 package jdk.test.lib;
 
 import java.io.File;
+import java.io.FileNotFoundException;
 import java.io.IOException;
 import java.io.RandomAccessFile;
 import java.nio.file.Path;
 import java.nio.file.Paths;
+import java.util.concurrent.TimeUnit;
 import java.util.regex.Pattern;
 import java.security.AccessController;
 import java.security.PrivilegedAction;
@@ -231,6 +233,59 @@ public static boolean hasSA() {
         return true;
     }
 
+    /**
+     * Return true if the test JDK is signed, otherwise false. Only valid on OSX.
+     */
+    public static boolean isSignedOSX() throws IOException {
+        // We only care about signed binaries for 10.14 and later (actually 10.14.5, but
+        // for simplicity we'll also include earlier 10.14 versions).
+        if (getOsVersionMajor() == 10 && getOsVersionMinor() < 14) {
+            return false; // assume not signed
+        }
+
+        // Find the path to the java binary.
+        String jdkPath = System.getProperty("java.home");
+        Path javaPath = Paths.get(jdkPath + "/bin/java");
+        String javaFileName = javaPath.toAbsolutePath().toString();
+        if (!javaPath.toFile().exists()) {
+            throw new FileNotFoundException("Could not find file " + javaFileName);
+        }
+
+        // Run codesign on the java binary.
+        ProcessBuilder pb = new ProcessBuilder("codesign", "-d", "-v", javaFileName);
+        pb.redirectError(ProcessBuilder.Redirect.DISCARD);
+        pb.redirectOutput(ProcessBuilder.Redirect.DISCARD);
+        Process codesignProcess = pb.start();
+        try {
+            if (codesignProcess.waitFor(10, TimeUnit.SECONDS) == false) {
+                System.err.println("Timed out waiting for the codesign process to complete. Assuming not signed.");
+                codesignProcess.destroyForcibly();
+                return false; // assume not signed
+            }
+        } catch (InterruptedException e) {
+            throw new RuntimeException(e);
+        }
+
+        // Check codesign result to see if java binary is signed. Here are the
+        // exit code meanings:
+        //    0: signed
+        //    1: not signed
+        //    2: invalid arguments
+        //    3: only has meaning with the -R argument.
+        // So we should always get 0 or 1 as an exit value.
+        if (codesignProcess.exitValue() == 0) {
+            System.out.println("Target JDK is signed. Some tests may be skipped.");
+            return true; // signed
+        } else if (codesignProcess.exitValue() == 1) {
+            System.out.println("Target JDK is not signed.");
+            return false; // not signed
+        } else {
+            System.err.println("Executing codesign failed. Assuming unsigned: " +
+                               codesignProcess.exitValue());
+            return false; // not signed
+        }
+    }
+
     /**
      * Return a boolean for whether we expect to be able to attach
      * the SA to our own processes on this system.  This requires
@@ -241,7 +296,7 @@ public static boolean shouldSAAttach() throws IOException {
         if (isLinux()) {
             return canPtraceAttachLinux();
         } else if (isOSX()) {
-            return canAttachOSX();
+            return canAttachOSX() && !isSignedOSX();
         } else {
             // Other platforms expected to work:
             return true;