Android版本实现root权限（本办法适用于所有android平台）-Toy模板网

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本方法适用于所有Android版本

userdebug和user版本
关闭selinux

system/core

diff --git a/init/selinux.cpp b/init/selinux.cpp
index 5a0255acd..787917274 100644
--- a/init/selinux.cpp
+++ b/init/selinux.cpp
@@ -104,6 +104,8 @@ EnforcingStatus StatusFromCmdline() {
 }
 
 bool IsEnforcing() {
+    return false;

+
     if (ALLOW_PERMISSIVE_SELINUX) {
         return StatusFromCmdline() == SELINUX_ENFORCING;
     }

修改su.cpp，注释用户组权限检测

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); // Handle -h and --help. ++argv;

给 su 文件默认授予 root 权限

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
@@ -86,7 +86,7 @@ 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 },
@@ -190,7 +190,7 @@ 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 },

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 9eede83e21e5..694eec2a40ac 100644
--- a/core/jni/com_android_internal_os_Zygote.cpp
+++ b/core/jni/com_android_internal_os_Zygote.cpp
@@ -656,6 +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++) {;
     if (prctl(PR_CAPBSET_DROP, i, 0, 0, 0) == -1) {
       if (errno == EINVAL) {
@@ -666,6 +667,7 @@ static void DropCapabilitiesBoundingSet(fail_fn_t fail_fn) {
       }
     }
   }
+  */

 }

kernel/security/commoncap.c文章来源地址https://www.toymoban.com/news/detail-456380.html

diff --git a/security/commoncap.c b/security/commoncap.c
index f86557a8e43f6..19124dd6239a1 100644
--- a/security/commoncap.c
+++ b/security/commoncap.c
@@ -1147,12 +1147,12 @@ 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();
        if (!new)
                return -ENOMEM;

user版本需要把su编进系统

diff --git a/target/product/base_system.mk b/target/product/base_system.mk
index 4569bceff9..5c8eaaa87c 100644
--- a/target/product/base_system.mk
+++ b/target/product/base_system.mk
@@ -273,6 +273,7 @@ PRODUCT_PACKAGES += \
     wificond \
     wifi.rc \
     wm \
+    su \

 
 # VINTF data for system image
 PRODUCT_PACKAGES += \
@@ -378,7 +379,6 @@ PRODUCT_PACKAGES_DEBUG := \
     ss \
     start_with_lockagent \
     strace \
-    su \

     sanitizer-status \
     tracepath \
     tracepath6 \

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