diff --git a/LaunchServer/src/main/java/ru/gravit/launchserver/StarterAgent.java b/LaunchServer/src/main/java/ru/gravit/launchserver/StarterAgent.java
index ed8b85c5..dc8b7457 100644
--- a/LaunchServer/src/main/java/ru/gravit/launchserver/StarterAgent.java
+++ b/LaunchServer/src/main/java/ru/gravit/launchserver/StarterAgent.java
@@ -4,27 +4,50 @@
 import java.lang.instrument.Instrumentation;
 import java.nio.file.*;
 import java.nio.file.attribute.BasicFileAttributes;
+import java.nio.file.attribute.PosixFileAttributeView;
+import java.nio.file.attribute.PosixFilePermission;
+import java.util.Arrays;
 import java.util.Collections;
+import java.util.HashSet;
+import java.util.Set;
 import java.util.jar.JarFile;
 
 public final class StarterAgent {
 
     private static final class StarterVisitor extends SimpleFileVisitor<Path> {
-        private final Instrumentation inst;
+    	private static final Set<PosixFilePermission> DPERMS;
+    	static {
+    		Set<PosixFilePermission> perms = new HashSet<>(Arrays.asList(PosixFilePermission.values()));
+    		perms.remove(PosixFilePermission.OTHERS_WRITE);
+    		perms.remove(PosixFilePermission.GROUP_WRITE);
+    		DPERMS = Collections.unmodifiableSet(perms);
+    	}
 
-        private StarterVisitor(Instrumentation inst) {
-            this.inst = inst;
+        private final Path filef;
+		private final boolean fixLib;
+
+		private StarterVisitor() {
+            this.filef = StarterAgent.libraries.resolve(".libraries_chmoded");
+            this.fixLib = !Files.exists(filef) && !Boolean.getBoolean("launcher.noLibrariesPosixPermsFix");
+            if (fixLib) {
+            	try {
+            		Files.deleteIfExists(filef);
+            		Files.createFile(filef);
+            	} catch (Throwable t) { }
+            }
         }
 
         @Override
         public FileVisitResult visitFile(Path file, BasicFileAttributes attrs) throws IOException {
+        	if (fixLib && Files.getFileAttributeView(file, PosixFileAttributeView.class) != null) Files.setPosixFilePermissions(file, DPERMS);
             if (file.toFile().getName().endsWith(".jar"))
                 inst.appendToSystemClassLoaderSearch(new JarFile(file.toFile()));
             return super.visitFile(file, attrs);
         }
     }
 
-    public static Instrumentation inst;
+    public static Instrumentation inst = null;
+    public static Path libraries = null;
     private static boolean isStarted = false;
 
     public static boolean isAgentStarted() {
@@ -33,9 +56,10 @@ public static boolean isAgentStarted() {
 
     public static void premain(String agentArgument, Instrumentation inst) {
         StarterAgent.inst = inst;
+        libraries = Paths.get("libraries");
         isStarted = true;
         try {
-            Files.walkFileTree(Paths.get("libraries"), Collections.singleton(FileVisitOption.FOLLOW_LINKS), Integer.MAX_VALUE, new StarterVisitor(inst));
+            Files.walkFileTree(libraries, Collections.singleton(FileVisitOption.FOLLOW_LINKS), Integer.MAX_VALUE, new StarterVisitor());
         } catch (IOException e) {
             e.printStackTrace(System.err);
         }