Android普通应用程序使用system权限

Android 在标准Linux系统上扩展了很多用户。

在Android 4.1中,定义这些用户的文件为

system/core/include/private/android_filesystem_config.h

在这里也就直接粘贴过来吧

#define AID_ROOT             0  /* traditional unix root user */

#define AID_SYSTEM        1000  /* system server */

#define AID_RADIO         1001  /* telephony subsystem, RIL */
#define AID_BLUETOOTH     1002  /* bluetooth subsystem */
#define AID_GRAPHICS      1003  /* graphics devices */
#define AID_INPUT         1004  /* input devices */
#define AID_AUDIO         1005  /* audio devices */
#define AID_CAMERA        1006  /* camera devices */
#define AID_LOG           1007  /* log devices */
#define AID_COMPASS       1008  /* compass device */
#define AID_MOUNT         1009  /* mountd socket */
#define AID_WIFI          1010  /* wifi subsystem */
#define AID_ADB           1011  /* android debug bridge (adbd) */
#define AID_INSTALL       1012  /* group for installing packages */
#define AID_MEDIA         1013  /* mediaserver process */
#define AID_DHCP          1014  /* dhcp client */
#define AID_SDCARD_RW     1015  /* external storage write access */
#define AID_VPN           1016  /* vpn system */
#define AID_KEYSTORE      1017  /* keystore subsystem */
#define AID_USB           1018  /* USB devices */
#define AID_DRM           1019  /* DRM server */
#define AID_MDNSR         1020  /* MulticastDNSResponder (service discovery) */
#define AID_GPS           1021  /* GPS daemon */
#define AID_UNUSED1       1022  /* deprecated, DO NOT USE */
#define AID_MEDIA_RW      1023  /* internal media storage write access */
#define AID_MTP           1024  /* MTP USB driver access */
#define AID_UNUSED2       1025  /* deprecated, DO NOT USE */
#define AID_DRMRPC        1026  /* group for drm rpc */
#define AID_NFC           1027  /* nfc subsystem */
#define AID_SDCARD_R      1028  /* external storage read access */


#define AID_SHELL         2000  /* adb and debug shell user */
#define AID_CACHE         2001  /* cache access */
#define AID_DIAG          2002  /* access to diagnostic resources */


/* The 3000 series are intended for use as supplemental group id's only.
 * They indicate special Android capabilities that the kernel is aware of. */
#define AID_NET_BT_ADMIN  3001  /* bluetooth: create any socket */
#define AID_NET_BT        3002  /* bluetooth: create sco, rfcomm or l2cap sockets */
#define AID_INET          3003  /* can create AF_INET and AF_INET6 sockets */
#define AID_NET_RAW       3004  /* can create raw INET sockets */
#define AID_NET_ADMIN     3005  /* can configure interfaces and routing tables. */
#define AID_NET_BW_STATS  3006  /* read bandwidth statistics */
#define AID_NET_BW_ACCT   3007  /* change bandwidth statistics accounting */
#define AID_QCOM_ONCRPC   3008  /* can read/write /dev/oncrpc files */


#if defined(MOTOROLA_UIDS)
#define AID_MOT_OSH       5000  /* OSH */
#define AID_MOT_ACCY      9000  /* access to accessory */
#define AID_MOT_PWRIC     9001  /* power IC */
#define AID_MOT_USB       9002  /* mot usb */
#define AID_MOT_DRM       9003  /* can access DRM resource. */
#define AID_MOT_TCMD      9004  /* mot_tcmd */
#define AID_MOT_SEC_RTC   9005  /* mot cpcap rtc */
#define AID_MOT_TOMBSTONE 9006
#define AID_MOT_TPAPI     9007  /* mot_tpapi */
#define AID_MOT_SECCLKD   9008  /* mot_secclkd */
#define AID_MOT_WHISPER   9009  /* Whisper Protocol access */
#define AID_MOT_CAIF      9010  /* can create CAIF sockets */
#define AID_MOT_DLNA      9011  /* DLNA native */
#endif // MOTOROLA_UIDS


#define AID_MISC          9998  /* access to misc storage */
#define AID_NOBODY        9999


#define AID_APP          10000  /* first app user */


#define AID_ISOLATED_START 99000 /* start of uids for fully isolated sandboxed processes */
#define AID_ISOLATED_END   99999 /* end of uids for fully isolated sandboxed processes */


#define AID_USER        100000  /* offset for uid ranges for each user */


普通应用程序使用的user ID 为AID_USER + app_id

比如u0_a46    1103  158   474424 30180 ffffffff 400afa70 S com.yixia.vitamio.media

它的user ID 就为10046


这里需要讨论的是,如何让一个app具有system权限,这样才可以对/data目录下的文件进行修改操作。

方法很简单,只需要在该app的AndroidManifest.xml中加一行代码即可

在开头处加上 android:sharedUserId="android.uid.system"

这样之后,所编译出来的app就是system用户了

system    547   158   473676 39788 ffffffff 400afa70 S com.android.systemui

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