Init

manager/app/src/main/cpp/CMakeLists.txt

@@ -0,0 +1,18 @@
+
+# For more information about using CMake with Android Studio, read the
+# documentation: https://d.android.com/studio/projects/add-native-code.html
+
+# Sets the minimum version of CMake required to build the native library.
+cmake_minimum_required(VERSION 3.18.1)
+
+project("kernelsu")
+
+add_library(kernelsu
+        SHARED
+        jni.cc
+        ksu.cc
+        )
+
+find_library(log-lib log)
+
+target_link_libraries(kernelsu ${log-lib})

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

@@ -0,0 +1,60 @@
+#include <jni.h>
+
+#include <sys/prctl.h>
+
+#include <android/log.h>
+
+#include "ksu.h"
+
+#define LOG_TAG "KernelSu"
+#define LOGD(...) __android_log_print(ANDROID_LOG_DEBUG, LOG_TAG, __VA_ARGS__)
+
+extern "C"
+JNIEXPORT jboolean JNICALL
+Java_me_weishu_kernelsu_Natives_becomeManager(JNIEnv *env, jclass clazz) {
+    return become_manager();
+}
+
+extern "C"
+JNIEXPORT jint JNICALL
+Java_me_weishu_kernelsu_Natives_getVersion(JNIEnv *env, jclass clazz) {
+    return get_version();
+}
+
+extern "C"
+JNIEXPORT jintArray JNICALL
+Java_me_weishu_kernelsu_Natives_getAllowList(JNIEnv *env, jclass clazz) {
+    int uids[1024];
+    int size = 0;
+    bool result = get_allow_list(uids, &size);
+    LOGD("getAllowList: %d, size: %d", result, size);
+    if (result) {
+        auto array = env->NewIntArray(size);
+        env->SetIntArrayRegion(array, 0, size, uids);
+        return array;
+    }
+    return env->NewIntArray(0);
+}
+
+extern "C"
+JNIEXPORT jintArray JNICALL
+Java_me_weishu_kernelsu_Natives_getDenyList(JNIEnv *env, jclass clazz) {
+    int uids[1024];
+    int size = 0;
+    bool result = get_deny_list(uids, &size);
+    if (result) {
+        // success!
+        auto array = env->NewIntArray(size);
+        env->SetIntArrayRegion(array, 0, size, uids);
+        return array;
+    }
+    return env->NewIntArray(0);
+}
+
+extern "C"
+JNIEXPORT jboolean JNICALL
+Java_me_weishu_kernelsu_Natives_allowRoot(JNIEnv *env, jclass clazz, jint uid, jboolean allow) {
+    return allow_su(uid, allow);
+}
+
+

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

@@ -0,0 +1,50 @@
+//
+// Created by weishu on 2022/12/9.
+//
+
+#include <sys/prctl.h>
+#include <stdint.h>
+
+#include "ksu.h"
+
+#define KERNEL_SU_OPTION 0xDEADBEEF
+
+#define CMD_GRANT_ROOT 0
+
+#define CMD_BECOME_MANAGER 1
+#define CMD_GET_VERSION 2
+#define CMD_ALLOW_SU 3
+#define CMD_DENY_SU 4
+#define CMD_GET_ALLOW_LIST 5
+#define CMD_GET_DENY_LIST 6
+
+static bool ksuctl(int cmd, void* arg1, void* arg2) {
+    int32_t result = 0;
+    prctl(KERNEL_SU_OPTION, cmd, arg1, arg2, &result);
+    return result == KERNEL_SU_OPTION;
+}
+
+bool become_manager() {
+    return ksuctl(CMD_BECOME_MANAGER, nullptr, nullptr);
+}
+
+int get_version() {
+    int32_t version = -1;
+    if (ksuctl(CMD_GET_VERSION, &version, nullptr)) {
+        return version;
+    }
+    return version;
+}
+
+bool allow_su(int uid, bool allow) {
+    int cmd = allow ? CMD_ALLOW_SU : CMD_DENY_SU;
+    return ksuctl(cmd, (void*) uid, nullptr);
+}
+
+bool get_allow_list(int *uids, int *size) {
+    return ksuctl(CMD_GET_ALLOW_LIST, uids, size);
+}
+
+bool get_deny_list(int *uids, int *size) {
+    return ksuctl(CMD_GET_DENY_LIST, uids, size);
+}

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

@@ -0,0 +1,18 @@
+//
+// Created by weishu on 2022/12/9.
+//
+
+#ifndef KERNELSU_KSU_H
+#define KERNELSU_KSU_H
+
+bool become_manager();
+
+int get_version();
+
+bool allow_su(int uid, bool allow);
+
+bool get_allow_list(int *uids, int *size);
+
+bool get_deny_list(int *uids, int *size);
+
+#endif //KERNELSU_KSU_H