manager: improve become_manager validation

manager/app/src/main/cpp/jni.cc

@@ -11,8 +11,11 @@
 
 extern "C"
 JNIEXPORT jboolean JNICALL
-Java_me_weishu_kernelsu_Natives_becomeManager(JNIEnv *env, jclass clazz) {
-    return become_manager();
+Java_me_weishu_kernelsu_Natives_becomeManager(JNIEnv *env, jclass clazz, jstring pkg) {
+    auto cpkg = env->GetStringUTFChars(pkg, nullptr);
+    auto result = become_manager(cpkg);
+    env->ReleaseStringUTFChars(pkg, cpkg);
+    return result;
 }
 
 extern "C"

manager/app/src/main/cpp/ksu.cc

@@ -4,6 +4,8 @@
 
 #include <sys/prctl.h>
 #include <stdint.h>
+#include <string.h>
+#include <stdio.h>
 
 #include "ksu.h"
 
@@ -24,8 +26,10 @@ static bool ksuctl(int cmd, void* arg1, void* arg2) {
     return result == KERNEL_SU_OPTION;
 }
 
-bool become_manager() {
-    return ksuctl(CMD_BECOME_MANAGER, nullptr, nullptr);
+bool become_manager(const char* pkg) {
+    char param[128];
+    sprintf(param, "/data/data/%s", pkg);
+    return ksuctl(CMD_BECOME_MANAGER, param, nullptr);
 }
 
 int get_version() {

manager/app/src/main/cpp/ksu.h

@@ -5,7 +5,7 @@
 #ifndef KERNELSU_KSU_H
 #define KERNELSU_KSU_H
 
-bool become_manager();
+bool become_manager(const char*);
 
 int get_version();