Android ：user版本赋予su权限-Toy模板网

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1. userdebug和user版本

2. 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;
     }

3. 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;

4. 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

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;

5. user版本需要把su编进系统

build/core文章来源地址https://www.toymoban.com/news/detail-783478.html

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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