Android 12中配置Selinux相关权限问题

1. 从logcat中过滤avc信息

avc: denied { read write } for comm="vendor.demo" name="ttyHW5" dev="tmpfs" ino=610 scontext=u:r:hal_gnss_default:s0 tcontext=u:object_r:device:s0 tclass=chr_file permissive=1
avc: denied { ioctl } for comm="vendor.demo" path="/dev/ttyHW5" dev="tmpfs" ino=610 ioctlcmd=0x5401 scontext=u:r:hal_gnss_default:s0 tcontext=u:object_r:device:s0 tclass=chr_file permissive=1
avc: denied { ioctl } for comm="vendor.demo" path="/dev/ttyHW5" dev="tmpfs" ino=610 ioctlcmd=0x5401 scontext=u:r:hal_gnss_default:s0 tcontext=u:object_r:device:s0 tclass=chr_file permissive=1

  2. 从avc中配置相关规则

allow hal_gnss_default device:chr_file rw_file_perms;

        但上面的规则无法生效。如上规则，放在系统里编译，会出现如下错误：

libsepol.report_failure: neverallow on line 681