android 权限
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Android系统沿用了Linux的UID/GID权限模型,但并没有使用传统的passws和group文件来存储用户和用户组的认证凭据,作为代替,Android定义了从名称到Android ID(AID) 的映射表。system/core/include/private/android_filesystem_config.h
#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 */
2.Android 权限
权限至用户组的映射表存储在/etc/permissions/platform.xml文件中。
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The following tags are associating low-level group IDs with permission names. By specifying such a mapping, you are saying that any application process granted the given permission will also be running with the given group ID attached to its process, so it can perform any filesystem (read, write, execute) operations allowed for that group.-->
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