ptrainbow / jnihook

jni hook demo

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jnihook's Issues

可变参数方法hook不生效

#include <stdarg.h>


jint (*originCallStaticIntMethod)(JNIEnv *env,  jclass obj, jmethodID methodId, ...);
jint CallStaticIntMethodOverride(JNIEnv *env,  jclass javaclass, jmethodID methodId, ...) {
   LOG("hook success");
   va_list args;
   va_start(args, methodId);
   jint result = originCallStaticIntMethod(env, javaclass, methodId, args);
   va_end(args);
   return result;
}

void hookStaticIntMethod(JNIEnv *env) {
   auto *functionTable = env->functions;
   void** funcPointerAddress = (void **)&(functionTable->CallStaticIntMethod);
   accessWrite(reinterpret_cast<unsigned long>(funcPointerAddress));
   originCallStaticIntMethod = functionTable->CallStaticIntMethod;
   void** newFuncPointerAddress = reinterpret_cast<void **>(&CallStaticIntMethodOverride);
   *funcPointerAddress = newFuncPointerAddress;
}

可变参数方法hook未生效，普通方法没问题，也不报错，不知道什么原因导致