该方法同时适用于RK3566，以及其他Android11 相关的RK平台

1. 需要将固件编译成 userdebug 版本，方法如下：

source build/envsetup.sh
lunch rk3566_r-userdebug
make -j32
./mkimage.sh

2. 关闭 selinux 模式，方法如下：

device/rockchip/common/BoardConfig.mk

diff --git a/BoardConfig.mk b/BoardConfig.mk
index e28fd4b..4fcbaf8 100755
--- a/BoardConfig.mk
+++ b/BoardConfig.mk
@@ -59,7 +59,7 @@ 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

3. 修改 su.cpp，注释用户组权限检测，方法如下：

system/extras/su/su.cpp

diff --git a/su/su.cpp b/su/su.cpp
index 1a1ab6bf..af3d2a68 100644
--- a/su/su.cpp
+++ b/su/su.cpp
@@ -80,8 +80,8 @@ 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, "not allowed");
+    //uid_t current_uid = getuid();
+    //if (current_uid != AID_ROOT && current_uid != AID_SHELL) error(1, 0, "not allowed");

4. 给su文件默认授予root 权限，方法如下：

system/core/libcutils/fs_config.cpp

diff --git a/libcutils/fs_config.cpp b/libcutils/fs_config.cpp
index 5805a4d19..92e93e76f 100644
--- a/libcutils/fs_config.cpp
+++ b/libcutils/fs_config.cpp
@@ -188,7 +188,7 @@ 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" },

     // the following files have enhanced capabilities and ARE included
     // in user builds.

frameworks/base/core/jni/com_android_internal_os_Zygote.cpp

diff --git a/core/jni/com_android_internal_os_Zygote.cpp b/core/jni/com_android_internal_os_Zygote.cpp
index 9eede83e21e..a260aca1fe8 100644
--- a/core/jni/com_android_internal_os_Zygote.cpp
+++ b/core/jni/com_android_internal_os_Zygote.cpp
@@ -656,7 +656,7 @@ static void EnableKeepCapabilities(fail_fn_t fail_fn) {
 }

 static void DropCapabilitiesBoundingSet(fail_fn_t fail_fn) {
-  for (int i = 0; prctl(PR_CAPBSET_READ, i, 0, 0, 0) >= 0; i++) {;
+  /*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 "
@@ -665,7 +665,7 @@ static void DropCapabilitiesBoundingSet(fail_fn_t fail_fn) {
         fail_fn(CREATE_ERROR("prctl(PR_CAPBSET_DROP, %d) failed: %s", i, strerror(errno)));
       }
     }
-  }
+  }*/
 }

kernel/security/commoncap.c

diff --git a/security/commoncap.c b/security/commoncap.c
index 876cfe01d939..8b338503b122 100644
--- a/security/commoncap.c
+++ b/security/commoncap.c
@@ -1167,10 +1167,12 @@ 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();
        if (!new)