Android中如何自己制作su

冷不防 2022-04-17 00:12 427阅读 0赞

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本文原博客：http://hubingforever.blog.163.com/blog/static/171040579201372915716149/

在Android源码的system\\extras（比如Android4.0\\system\\extras）下新建一个目录，比如su\_robin目录

在su\_robin目录下包含以三个文件：

**su.h文件**

\#ifndef  SU\_h

\#define  SU\_h  1

\#ifdef  LOG\_TAG

\#undef  LOG\_TAG

\#endif

\#define  LOG\_TAG  "robin"

\#define  REQUESTOR  "com.noshufou.android.su"

\#define  REQUESTOR\_DATA\_PATH  "/data/data/"  REQUESTOR

\#define  REQUESTOR\_CACHE\_PATH  "/dev/"  REQUESTOR

\#define  REQUESTOR\_DATABASES\_PATH REQUESTOR\_DATA\_PATH  "/databases"

\#define  REQUESTOR\_DATABASE\_PATH REQUESTOR\_DATABASES\_PATH  "/permissions.sqlite"

/\* intent actions \*/

\#define  ACTION\_REQUEST REQUESTOR  ".REQUEST"

\#define  ACTION\_RESULT  REQUESTOR  ".RESULT"

\#define  DEFAULT\_SHELL  "/system/bin/sh"

\#ifdef  SU\_LEGACY\_BUILD

\#define  VERSION\_EXTRA   "l"

\#else

\#define  VERSION\_EXTRA   ""

\#endif

\#define  VERSION  "3.1.1"  VERSION\_EXTRA

\#define  VERSION\_CODE  17

\#define  DATABASE\_VERSION  6

\#define  PROTO\_VERSION  0

struct  su\_initiator  \{

pid\_t  pid ;

unsigned  uid ;

char  bin \[ PATH\_MAX \];

char  args \[ 4096 \];

\};

struct  su\_request  \{

unsigned  uid ;

int  login ;

int  keepenv ;

char  \* shell ;

char  \* command ;

char  \*\* argv ;

int  argc ;

int  optind ;

\};

struct  su\_context  \{

struct  su\_initiator  from ;

struct  su\_request to ;

mode\_t  umask ;

\};

enum  \{

DB\_INTERACTIVE ,

DB\_DENY ,

DB\_ALLOW

\};

\#endif

注意，这里的很多东西是多余。

**su.c文件**

\#include  <sys/types.h>

\#include  <sys/socket.h>

\#include  <sys/un.h>

\#include  <sys/wait.h>

\#include  <sys/select.h>

\#include  <sys/time.h>

\#include  <unistd.h>

\#include  <limits.h>

\#include  <fcntl.h>

\#include  <errno.h>

\#include  <endian.h>

\#include  <stdio.h>

\#include  <stdlib.h>

\#include  <string.h>

\#include  <getopt.h>

\#include  <stdint.h>

\#include  <pwd.h>

\#include  <private/android\_filesystem\_config.h>

\#include  <cutils/properties.h>

\#include  <cutils/log.h>

\#include  "su.h"

int  main ( int  argc ,  char  \* argv \[\])

LOGI ( "hello !robin-su begin %d !" , getuid ());

printf ( "hello !robin-su begin" );

int  uid = 0 ;

int  gid = 0 ;

if ( setgid ( gid )  ||  setuid ( uid ))  \{

LOGI ( "robin su: permission denied\\n" );

fprintf ( stderr , "su: permission denied\\n" );

return  1 ;

char  command \[ 1024 \];

LOGI ( "hello !robin-su end %d !" , getuid ());

printf ( "hello !robin-su end" );

/\* Default exec shell. \*/

execlp ( "/system/bin/sh" ,  "sh" ,  NULL );

fprintf ( stderr ,  "su: exec failed\\n" );

return  1 ;

**Android.mk文件**

LOCAL\_PATH  :=  $ ( call  my \- dir )

include $ ( CLEAR\_VARS )

LOCAL\_MODULE  :=  sur

LOCAL\_SRC\_FILES  :=  su . c

LOCAL\_STATIC\_LIBRARIES  :=  \\

liblog \\

libc \\

LOCAL\_MODULE\_PATH  :=  $ ( TARGET\_OUT\_OPTIONAL\_EXECUTABLES )

LOCAL\_MODULE\_TAGS  :=  eng debug

LOCAL\_FORCE\_STATIC\_EXECUTABLE  :=  true

include $ ( BUILD\_EXECUTABLE )

编译Android源码，生成rom

如果你还不知道如何编译Android源码，请参照

[http://source.android.com/source/building-running.html][http_source.android.com_source_building-running.html]

在out\\target\\product\\generic\\system\\xbin目录下找到生成的可执行文件 sur,就是我们自己制作的su文件

通过adb push命令将其推送到手机上的 system\\xbin目录，

通过执行系统原来自己带的su切换到root用户，对手机上sur文件执行 chmod  6 777 sur命令。

使文件属性变为 rwsrwsrwx，如下所示

rw s rwsrwx root     root        58960 2013-08-29 11:31  sur

然后你可以 通过执行系统原来自己带的sur切换到root用户

关于 chmod  6 777 sur 命令请参考《 [chmod命令基本篇][chmod] 》和 请参考《 [chmod命令高级篇（ SetUID与SetGID标识位）][chmod_SetUID_SetGID] 》

关于 setuid 请参考《 [setuid()与setgid()的使用 ][setuid_setgid] 》

结束！

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![这里写图片描述][SouthEast]

[http_blog.csdn.net_jiangjunshow]: https://blog.csdn.net/jiangjunshow/article/details/77338485
[http_source.android.com_source_building-running.html]: http://source.android.com/source/building-running.html
[chmod]: http://hubingforever.blog.163.com/blog/static/171040579201041432333648/
[chmod_SetUID_SetGID]: http://hubingforever.blog.163.com/blog/static/17104057920138232126687/
[setuid_setgid]: http://hubingforever.blog.163.com/blog/static/171040579201372932033844/
[SouthEast]: /images/20220417/4f828ed290bd44d4b570827287dbbcc8.png