Android 11 第三方APP串口工具找不到串口添加SELinux权限

huang490649

1.在/device/mediatek/sepolicy/basic/non_plat/untrusted_app.te添加权限
        allow untrusted_app proc_tty_drivers:file { read write ioctl open getattr };
        allow untrusted_app ttyS_device:chr_file { read write open ioctl getattr };
        allow untrusted_app device:dir { read write open ioctl getattr };
       
2.在/device/mediatek/sepolicy/basic/non_plat/mnld.te添加权限
        allow mnld ttyS_device:chr_file { read write open ioctl getattr };
       
3.在/device/mediatek/sepolicy/basic/neverallows/non_plat/neverallows.te       
        /device/mediatek/sepolicy/basic/neverallows/plat_private/neverallows.te
        /device/mediatek/sepolicy/basic/neverallows/plat_public/neverallows.te 添加
       
         -vendor_init
         -vold
         -ueventd
+        -untrusted_app
     } device:dir ~{ search getattr };
         
4.在/system/sepolicy/prebuilts/api/30.0/private/app_neverallows.te
      /system/sepolicy/private/app_neverallows.te b/system/sepolicy/private/app_neverallows.te屏蔽
       
        +#neverallow { all_untrusted_apps -untrusted_app_25 } proc_tty_drivers:file r_file_perms;
        +#neverallow all_untrusted_apps proc_tty_drivers:file ~r_file_perms;