Root Android OS - Revision history

Yunjin.jiang at 03:48, 24 July 2019

2019-07-24T03:48:24Z

2019-07-24T03:45:08Z

2019-07-24T03:43:44Z

2019-07-24T03:42:58Z

2019-07-24T03:40:51Z

2019-07-24T03:38:22Z

2019-07-24T03:36:03Z

2019-07-24T03:35:13Z

2019-07-24T03:32:07Z

2019-07-24T03:31:27Z

@@ Line 11: / Line 11: @@
 In Linux OS, user's passwords are recorded in /etc/shadow, and only root can write. How could other users &nbsp;modify their passwords? That is all attributed to setUID.&nbsp;<br/>''ls /usr/bin/passwd -al<br/>-rwsr-xr-x 1 root root 47032 &nbsp;16 Jul &nbsp;2015 /usr/bin/passwd''
-Except "wrx", there is another privilege “s” , and it is "setUID" which allows normal user temporarily own the privilege of root.
+Except "wrx", there is another privilege “s” , and it is "setUID" which allows normal user temporarily to own the privilege of root.
 = Root in android =

@@ Line 15: / Line 15: @@
 = Root in android =
-We use command "su" to change user from normal user to root，but in standard android system&nbsp;DOSE NOT allow normal user to change to root for security reasons. So what we should do is giving the privillege to normal users include adb, debug console and apps .
+We use command "su" to change user from normal user to root，but standard android system&nbsp;DOSE NOT allow normal user to change to root for security reasons. So what we should do is giving the privillege to normal users include adb, debug console and apps .
 = How to root system =

@@ Line 29: / Line 29: @@
 == Allow apps to have the privileges of root.&nbsp; ==
-'''Step 1：'''<br/>Remove the limitation of only AID_ROOT and AID_SHELL can use the command "su".<br/>It is built into /system/xbin/su.
+'''Step 1：'''<br/>Remove the limitation that&nbsp;only AID_ROOT and AID_SHELL can use the command "su".<br/>It is built into /system/xbin/su.
 <br/>''diff --git a/system/extras/su/su.cpp b/system/extras/su/su.cpp<br/>index ee1526ef93..f7d931a5e3 100644<br/>--- a/system/extras/su/su.cpp<br/>+++ b/system/extras/su/su.cpp<br/>@@ -81,8 +81,10 @@ void extract_uidgids(const char* uidgids, uid_t* uid, gid_t* gid, gid_t* gids, i<br/>&nbsp;}<br/>&nbsp;<br/>&nbsp;int main(int argc, char** argv) {<br/>+/*<br/>&nbsp; &nbsp; &nbsp;uid_t current_uid = getuid();<br/>&nbsp; &nbsp; &nbsp;if (current_uid&nbsp;!= AID_ROOT && current_uid&nbsp;!= AID_SHELL) error(1, 0, "not allowed");<br/>+*/<br/>&nbsp;<br/>&nbsp; &nbsp; &nbsp;// Handle -h and --help.<br/>&nbsp; &nbsp; &nbsp;++argv;''

@@ Line 11: / Line 11: @@
 In Linux OS, user's passwords are recorded in /etc/shadow, and only root can write. How could other users &nbsp;modify their passwords? That is all attributed to setUID.&nbsp;<br/>''ls /usr/bin/passwd -al<br/>-rwsr-xr-x 1 root root 47032 &nbsp;16 Jul &nbsp;2015 /usr/bin/passwd''
-Except "wrx", there is another privilege “s” , and it is "setUID" which allow normal user temporarily own the privilege of root.
+Except "wrx", there is another privilege “s” , and it is "setUID" which allows normal user temporarily own the privilege of root.
 = Root in android =

@@ Line 15: / Line 15: @@
 = Root in android =
-We use command "su" to change user from normal user to root，but in standard android system&nbsp;DOSE NOT allow normal user change to root for security reasons. So what we should do is giving the privillege to normal users include adb, debug console and apps .
+We use command "su" to change user from normal user to root，but in standard android system&nbsp;DOSE NOT allow normal user to change to root for security reasons. So what we should do is giving the privillege to normal users include adb, debug console and apps .
 = How to root system =