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sharecode
/
java
/
src
/
Jvm.java
sharecode
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java
/
src
/
Jvm.java
Jvm.java 9.30 KB
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dwing 提交于 2024年12月10日 17:32 +08:00 . java: improve Jvm 
import java.lang.foreign.Arena;

import java.lang.foreign.FunctionDescriptor;

import java.lang.foreign.Linker;

import java.lang.foreign.MemorySegment;

import java.lang.foreign.SymbolLookup;

import java.lang.invoke.MethodHandles;

import java.lang.invoke.MethodType;

import java.lang.reflect.AccessibleObject;

import java.lang.reflect.Field;

import java.lang.reflect.Method;

import java.nio.file.Files;

import java.nio.file.Path;

import java.util.Arrays;

import static java.lang.foreign.ValueLayout.*;



//ref: https://github.com/dreamlike-ocean/backend_qingyou/blob/main/dreamlike%E7%9A%84%E7%A7%81%E8%B4%A7/afterUnsafe.md

//ref: https://github.com/dreamlike-ocean/UnsafeJava/blob/master/unsafe-core/src/main/java/top/dreamlike/unsafe/core/panama/jni/JNIEnv.java

public class Jvm {

	public static final MethodHandles.Lookup lookup = MethodHandles.lookup();



	static {

		var jvmName = System.mapLibraryName("jvm");

		var javaHome = System.getProperty("java.home");

		var jvmPath = javaHome + "/lib/server/" + jvmName;

		if (!Files.exists(Path.of(jvmPath)))

			jvmPath = javaHome + "/bin/server/" + jvmName;

		Runtime.getRuntime().load(jvmPath);



		try (var arena = Arena.ofConfined()) {

			var pAddr = arena.allocate(ADDRESS);

			var pNumVms = arena.allocate(JAVA_INT);

			pNumVms.set(JAVA_INT, 0, 0);

			var linker = Linker.nativeLinker();

			// jint JNI_GetCreatedJavaVMs(JavaVM** vm_buf, jsize bufLen, jsize* numVMs);

			int r = (int)linker.downcallHandle(SymbolLookup.loaderLookup().find("JNI_GetCreatedJavaVMs").orElseThrow(),

					FunctionDescriptor.of(JAVA_INT, ADDRESS, JAVA_INT, ADDRESS)).invokeExact(pAddr, 1, pNumVms);

			if (r != 0)

				throw new ExceptionInInitializerError("JNI_GetCreatedJavaVMs=" + r);

			var pJavaVm = pAddr.get(ADDRESS, 0);

			var pGetEnv = pJavaVm.reinterpret(ADDRESS.byteSize()).get(ADDRESS, 0).reinterpret(ADDRESS.byteSize() * 8)

					.get(ADDRESS, ADDRESS.byteSize() * 6);

			// int GetEnv(JavaVM* vm, void** penv, jint version);

			r = (int)linker.downcallHandle(pGetEnv, FunctionDescriptor.of(JAVA_INT, ADDRESS, ADDRESS, JAVA_INT))

					.invokeExact(pJavaVm, pAddr, 21 << 16);

			if (r != 0)

				throw new ExceptionInInitializerError("JavaVM.GetEnv=" + r);

			var pEnv = pAddr.get(ADDRESS, 0);

			var envFuncs = pEnv.reinterpret(ADDRESS.byteSize()).get(ADDRESS, 0).reinterpret(ADDRESS.byteSize() * 235);



			// jclass FindClass(JNIEnv* env, const char* name);

			var mhFindClass = linker.downcallHandle(envFuncs.get(ADDRESS, ADDRESS.byteSize() * 6),

					FunctionDescriptor.of(ADDRESS, ADDRESS, ADDRESS));

			// jobject NewGlobalRef(JNIEnv* env, jobject lobj);

			var mhNewGlobalRef = linker.downcallHandle(envFuncs.get(ADDRESS, ADDRESS.byteSize() * 21),

					FunctionDescriptor.of(ADDRESS, ADDRESS, ADDRESS));

			// void DeleteGlobalRef(JNIEnv* env, jobject gref);

			var mhDeleteGlobalRef = linker.downcallHandle(envFuncs.get(ADDRESS, ADDRESS.byteSize() * 22),

					FunctionDescriptor.ofVoid(ADDRESS, ADDRESS));

			// jmethodID GetMethodID(JNIEnv* env, jclass clazz, const char* name, const char* sig);

			var mhGetMethodID = linker.downcallHandle(envFuncs.get(ADDRESS, ADDRESS.byteSize() * 33),

					FunctionDescriptor.of(ADDRESS, ADDRESS, ADDRESS, ADDRESS, ADDRESS));

			// jobject CallObjectMethod(JNIEnv* env, jobject obj, jmethodID methodID, ...);

			var mhCallObjectMethod0 = linker.downcallHandle(envFuncs.get(ADDRESS, ADDRESS.byteSize() * 34),

					FunctionDescriptor.of(ADDRESS, ADDRESS, ADDRESS, ADDRESS));

			// jmethodID GetStaticMethodID(JNIEnv* env, jclass clazz, const char* name, const char* sig);

			var mhGetStaticMethodID = linker.downcallHandle(envFuncs.get(ADDRESS, ADDRESS.byteSize() * 113),

					FunctionDescriptor.of(ADDRESS, ADDRESS, ADDRESS, ADDRESS, ADDRESS));

			// jobject CallStaticObjectMethod(JNIEnv* env, jclass clazz, jmethodID methodID, ...);

			var mhCallStaticObjectMethod0 = linker.downcallHandle(envFuncs.get(ADDRESS, ADDRESS.byteSize() * 114),

					FunctionDescriptor.of(ADDRESS, ADDRESS, ADDRESS, ADDRESS));

			var mhCallStaticObjectMethod3 = linker.downcallHandle(envFuncs.get(ADDRESS, ADDRESS.byteSize() * 114),

					FunctionDescriptor.of(ADDRESS, ADDRESS, ADDRESS, ADDRESS, ADDRESS, ADDRESS, ADDRESS));

			// jfieldID GetStaticFieldID(JNIEnv* env, jclass clazz, const char* name, const char* sig);

			var mhGetStaticFieldID = linker.downcallHandle(envFuncs.get(ADDRESS, ADDRESS.byteSize() * 144),

					FunctionDescriptor.of(ADDRESS, ADDRESS, ADDRESS, ADDRESS, ADDRESS));

			// jobject GetStaticObjectField(JNIEnv* env, jclass clazz, jfieldID fieldID);

			var mhGetStaticObjectField = linker.downcallHandle(envFuncs.get(ADDRESS, ADDRESS.byteSize() * 145),

					FunctionDescriptor.of(ADDRESS, ADDRESS, ADDRESS, ADDRESS));

			// void SetStaticObjectField(JNIEnv* env, jclass clazz, jfieldID fieldID, jobject value);

			var mhSetStaticObjectField = linker.downcallHandle(envFuncs.get(ADDRESS, ADDRESS.byteSize() * 154),

					FunctionDescriptor.ofVoid(ADDRESS, ADDRESS, ADDRESS, ADDRESS));

			// jstring NewStringUTF(JNIEnv* env, const char* utf);

			var mhNewStringUTF = linker.downcallHandle(envFuncs.get(ADDRESS, ADDRESS.byteSize() * 167),

					FunctionDescriptor.of(ADDRESS, ADDRESS, ADDRESS));



			var threadClass = (MemorySegment)mhFindClass.invokeExact(pEnv,

					arena.allocateFrom("java/lang/Thread"));

			var threadClassGlobal = (MemorySegment)mhNewGlobalRef.invokeExact(pEnv, threadClass);

			var classClass = (MemorySegment)mhFindClass.invokeExact(pEnv,

					arena.allocateFrom("java/lang/Class"));

			var classClassGlobal = (MemorySegment)mhNewGlobalRef.invokeExact(pEnv, classClass);

			var lookupClass = (MemorySegment)mhFindClass.invokeExact(pEnv,

					arena.allocateFrom("java/lang/invoke/MethodHandles$Lookup"));

			var lookupClassGlobal = (MemorySegment)mhNewGlobalRef.invokeExact(pEnv, lookupClass);



			var currentThreadMethodId = (MemorySegment)mhGetStaticMethodID.invokeExact(pEnv, threadClassGlobal,

					arena.allocateFrom("currentThread"), arena.allocateFrom("()Ljava/lang/Thread;"));

			var getContextClassLoaderMethodId = (MemorySegment)mhGetMethodID.invokeExact(pEnv, threadClassGlobal,

					arena.allocateFrom("getContextClassLoader"), arena.allocateFrom("()Ljava/lang/ClassLoader;"));

			var forNameMethodId = (MemorySegment)mhGetStaticMethodID.invokeExact(pEnv, classClassGlobal,

					arena.allocateFrom("forName"),

					arena.allocateFrom("(Ljava/lang/String;ZLjava/lang/ClassLoader;)Ljava/lang/Class;"));



			var curThreadObj = (MemorySegment)mhCallStaticObjectMethod0.invokeExact(

					pEnv, threadClassGlobal, currentThreadMethodId);

			var curThreadObjGlobal = (MemorySegment)mhNewGlobalRef.invokeExact(pEnv, curThreadObj);

			var curClassLoaderObj = (MemorySegment)mhCallObjectMethod0.invokeExact(

					pEnv, curThreadObjGlobal, getContextClassLoaderMethodId);

			var curClassLoaderObjGlobal = (MemorySegment)mhNewGlobalRef.invokeExact(pEnv, curClassLoaderObj);



			var thisClassNameStr = (MemorySegment)mhNewStringUTF.invokeExact(

					pEnv, arena.allocateFrom(Jvm.class.getName().replace('.', '/')));

			var thisClassNameStrGlobal = (MemorySegment)mhNewGlobalRef.invokeExact(pEnv, thisClassNameStr);

			var thisClassObj = (MemorySegment)mhCallStaticObjectMethod3.invokeExact(pEnv, classClassGlobal,

					forNameMethodId, thisClassNameStrGlobal, MemorySegment.NULL, curClassLoaderObjGlobal);

			var thisClassObjGlobal = (MemorySegment)mhNewGlobalRef.invokeExact(pEnv, thisClassObj);



			var lookupSig = arena.allocateFrom("Ljava/lang/invoke/MethodHandles$Lookup;");

			var implLookupFieldId = (MemorySegment)mhGetStaticFieldID

					.invokeExact(pEnv, lookupClassGlobal, arena.allocateFrom("IMPL_LOOKUP"), lookupSig);

			var thisLookupFieldId = (MemorySegment)mhGetStaticFieldID

					.invokeExact(pEnv, thisClassObjGlobal, arena.allocateFrom("lookup"), lookupSig);



			mhSetStaticObjectField.invokeExact(pEnv, thisClassObjGlobal, thisLookupFieldId,

					(MemorySegment)mhGetStaticObjectField.invokeExact(pEnv, lookupClassGlobal, implLookupFieldId));



			mhDeleteGlobalRef.invokeExact(pEnv, thisClassObjGlobal);

			mhDeleteGlobalRef.invokeExact(pEnv, thisClassNameStrGlobal);

			mhDeleteGlobalRef.invokeExact(pEnv, curClassLoaderObjGlobal);

			mhDeleteGlobalRef.invokeExact(pEnv, curThreadObjGlobal);

			mhDeleteGlobalRef.invokeExact(pEnv, lookupClassGlobal);

			mhDeleteGlobalRef.invokeExact(pEnv, classClassGlobal);

			mhDeleteGlobalRef.invokeExact(pEnv, threadClassGlobal);

		} catch (RuntimeException | Error e) {

			throw e;

		} catch (Throwable e) {

			throw new ExceptionInInitializerError(e);

		}

	}



	public static void main(String[] args) throws Throwable {

		System.out.println(System.getProperty("java.home"));

		System.out.println(lookup); // "/trusted"



		var unsafeClass = Class.forName("jdk.internal.misc.Unsafe");

		var u = lookup.findStaticGetter(unsafeClass, "theUnsafe", unsafeClass).invoke();

		System.out.println(u);



		var getFields = lookup.findSpecial(Class.class, "getDeclaredFields0",

				MethodType.methodType(Field[].class, boolean.class), Class.class);

		var getMethods = lookup.findSpecial(Class.class, "getDeclaredMethods0",

				MethodType.methodType(Method[].class, boolean.class), Class.class);

		System.out.println("---");

		System.out.println(Arrays.toString((Field[])getFields.invokeExact(

				AccessibleObject.class, false)).replace(", ", "\n "));

		System.out.println("---");

		System.out.println(Arrays.toString((Method[])getMethods.invokeExact(

				Class.forName("jdk.internal.reflect.Reflection"), false)).replace(", ", "\n "));

		System.out.println("---");

	}

}
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