关闭selinux

修改此文件（"+"号为修改内容）

device/rockchip/common/BoardConfig.mk

BOARD_BOOT_HEADER_VERSION ?= 2

BOARD_MKBOOTIMG_ARGS :=

BOARD_PREBUILT_DTBOIMAGE ?= $(TARGET_DEVICE_DIR)/dtbo.img

BOARD_ROCKCHIP_VIRTUAL_AB_ENABLE ?= false

-BOARD_SELINUX_ENFORCING ?= true

+BOARD_SELINUX_ENFORCING ?= false

注释用户组权限检测

修改此文件（"+"号为修改内容）

system/extras/su/su.cpp

void extract_uidgids(const char* uidgids, uid_t* uid, gid_t*

gid, gid_t* gids, i

}

int main(int argc, char** argv) {

- uid_t current_uid = getuid();

- if (current_uid != AID_ROOT && current_uid != AID_SHELL) error(1, 0, "notallowed");

+ //uid_t current_uid = getuid();

+ //if (current_uid != AID_ROOT && current_uid != AID_SHELL) error(1, 0, "notallowed");

给su文件默认授予root权限

修改此文件（"+"号为修改内容）

system/core/libcutils/fs_config.cpp

static const struct fs_path_config android_dirs[] = {

     { 00751, AID_ROOT,         AID_SHELL,        0, "system/bin" },

     { 00755, AID_ROOT,         AID_ROOT,         0, "system/etc/ppp" },

     { 00755, AID_ROOT,         AID_SHELL,        0, "system/vendor" },

-    { 00750, AID_ROOT,         AID_SHELL,        0, "system/xbin" },

+    { 00755, AID_ROOT,         AID_SHELL,        0, "system/xbin" },

     { 00751, AID_ROOT,         AID_SHELL,        0, "system/apex/*/bin" },

     { 00751, AID_ROOT,         AID_SHELL,        0, "system_ext/bin" },

     { 00751, AID_ROOT,         AID_SHELL,        0, "system_ext/apex/*/bin" },

static const struct fs_path_config android_files[] = {

     // the following two files are INTENTIONALLY set-uid, but they

     // are NOT included on user builds.

     { 06755, AID_ROOT,      AID_ROOT,      0, "system/xbin/procmem" },

-    { 04750, AID_ROOT,      AID_SHELL,     0, "system/xbin/su" },

+    { 06755, AID_ROOT,      AID_SHELL,     0, "system/xbin/su" },

然后修改此文件（"+"号为修改内容）

frameworks/base/core/jni/com_android_internal_os_Zygote.cpp

static void DropCapabilitiesBoundingSet(fail_fn_t fail_fn) {

+/*

  for (int i = 0; prctl(PR_CAPBSET_READ, i, 0, 0, 0) >= 0; i++) {;

    if (prctl(PR_CAPBSET_DROP, i, 0, 0, 0) == -1) {

      if (errno == EINVAL) {

        ALOGE("prctl(PR_CAPBSET_DROP) failed with EINVAL. Please verify "

              "your kernel is compiled with file capabilities support");

      } else {

        fail_fn(CREATE_ERROR("prctl(PR_CAPBSET_DROP, %d) failed: %s", i, strerror(errno)));

      }

    }

  }

+ */

}

最后修改此文件（"+"号为修改内容）

kernel-5.10/security/commoncap.c

int cap_task_setnice(struct task_struct *p, int nice)

static int cap_prctl_drop(unsigned long cap)

{

    struct cred *new;

+/*

    if (!ns_capable(current_user_ns(), CAP_SETPCAP))

    return -EPERM;

    if (!cap_valid(cap))

    return -EINVAL;

-

+*/

new = prepare_creds();

源码编译并验证固件是否ROOT

修改完上面三个步骤的文件后，重新编译内核和安卓源码，执行以下命令：

# make -j4下载RootChecker测试APK软件包（自行下载）,可通过ADB命令或者U盘安装,安装后按照提示点击按钮检查root。root成功如图：

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