UML in android9.0

[房伟]

    I want to run user mode linux on Android system;  but there is somthing when running uml!

    Android source version: 9.0

     Kernel source branch:   android-4.14-p

    I followed on these steps:

    1)  Compile UML userspace
    $ . build/envsetup.sh
    $ lunch uml-userdebug
    $ make -j40

    2) Compile UML Kernel on android-4.14-p branch
    $ ARCH=um SUBARCH=x86_64 scripts/kconfig/merge_config.sh
    arch/um/configs/x86_64_defconfig kernel/configs/android-base.config
    kernel/configs/android-recommended.config
    $ make ARCH=um SUBARCH=x86_64 CROSS_COMPILE= -j40

   3) ./vmlinux initrd=ramdisk.img ubda=system.img ubdb=userdata.img  androidboot.hardware=uml mem=256M umid=uml

       The log output:

init: First stage mount skipped (missing/incompatible fstab in device tree)
init: Skipped setting INIT_AVB_VERSION (not in recovery mode)
init: Loading SELinux policy
SELinux:  Class process2 not defined in policy.
SELinux:  Permission watch in class filesystem not defined in policy.
SELinux:  Permission watch in class file not defined in policy.
SELinux:  Permission watch_mount in class file not defined in policy.
SELinux:  Permission watch_sb in class file not defined in policy.
SELinux:  Permission watch_with_perm in class file not defined in policy.
SELinux:  Permission watch_reads in class file not defined in policy.
SELinux:  Permission watch in class dir not defined in policy.
SELinux:  Permission watch_mount in class dir not defined in policy.
SELinux:  Permission watch_sb in class dir not defined in policy.
SELinux:  Permission watch_with_perm in class dir not defined in policy.
SELinux:  Permission watch_reads in class dir not defined in policy.
SELinux:  Permission watch in class lnk_file not defined in policy.
SELinux:  Permission watch_mount in class lnk_file not defined in policy.
SELinux:  Permission watch_sb in class lnk_file not defined in policy.
SELinux:  Permission watch_with_perm in class lnk_file not defined in policy.
SELinux:  Permission watch_reads in class lnk_file not defined in policy.
SELinux:  Permission watch in class chr_file not defined in policy.
SELinux:  Permission watch_mount in class chr_file not defined in policy.
SELinux:  Permission watch_sb in class chr_file not defined in policy.
SELinux:  Permission watch_with_perm in class chr_file not defined in policy.
SELinux:  Permission watch_reads in class chr_file not defined in policy.
SELinux:  Permission watch in class blk_file not defined in policy.
SELinux:  Permission watch_mount in class blk_file not defined in policy.
SELinux:  Permission watch_sb in class blk_file not defined in policy.
SELinux:  Permission watch_with_perm in class blk_file not defined in policy.
SELinux:  Permission watch_reads in class blk_file not defined in policy.
SELinux:  Permission watch in class sock_file not defined in policy.
SELinux:  Permission watch_mount in class sock_file not defined in policy.
SELinux:  Permission watch_sb in class sock_file not defined in policy.
SELinux:  Permission watch_with_perm in class sock_file not defined in policy.
SELinux:  Permission watch_reads in class sock_file not defined in policy.
SELinux:  Permission watch in class fifo_file not defined in policy.
SELinux:  Permission watch_mount in class fifo_file not defined in policy.
SELinux:  Permission watch_sb in class fifo_file not defined in policy.
SELinux:  Permission watch_with_perm in class fifo_file not defined in policy.
SELinux:  Permission watch_reads in class fifo_file not defined in policy.
SELinux:  Permission name_connect in class sctp_socket not defined in policy.
SELinux:  Permission association in class sctp_socket not defined in policy.
SELinux:  Class infiniband_pkey not defined in policy.
SELinux:  Class infiniband_endport not defined in policy.
SELinux:  Class xdp_socket not defined in policy.
SELinux:  Class perf_event not defined in policy.
SELinux: the above unknown classes and permissions will be denied
SELinux:  policy capability network_peer_controls=1
SELinux:  policy capability open_perms=1
SELinux:  policy capability extended_socket_class=1
SELinux:  policy capability always_check_network=0
SELinux:  policy capability cgroup_seclabel=0
SELinux:  policy capability nnp_nosuid_transition=0
audit: type=1403 audit(1577771151.933:2): auid=4294967295 ses=4294967295 lsm=selinux res=1
selinux: SELinux: Loaded policy from /sepolicy

audit: type=1404 audit(1577771151.933:3): enforcing=1 old_enforcing=0 auid=4294967295 ses=4294967295 enabled=1 old-enabled=1 lsm=selinux res=1
selinux: SELinux: Loaded file_contexts

random: init: uninitialized urandom read (40 bytes read)
init: init second stage started!
init: Using Android DT directory /proc/device-tree/firmware/android/
selinux: SELinux: Loaded file_contexts

init: Running restorecon...
selinux: SELinux:  Could not stat /dev/block: No such file or directory.

init: waitid failed: No child processes
init: Created socket '/dev/socket/property_service', mode 666, user 0, group 0
init: Forked subcontext for 'u:r:vendor_init:s0' with pid 68
init: Forked subcontext for 'u:r:vendor_init:s0' with pid 69
random: init: uninitialized urandom read (40 bytes read)
random: init: uninitialized urandom read (40 bytes read)
audit: type=1400 audit(1577771151.993:4): avc:  denied  { map } for  pid=68 comm="init" path="/plat_file_contexts" dev="rootfs" ino=2651 scontext=u:r:vendor_init:s0 tcontext=u:object_r:file_contexts_file:s0 tclass=file permissive=0
audit: type=1400 audit(1577771151.993:5): avc:  denied  { map } for  pid=69 comm="init" path="/plat_file_contexts" dev="rootfs" ino=2651 scontext=u:r:vendor_init:s0 tcontext=u:object_r:file_contexts_file:s0 tclass=file permissive=0
random: fast init done

My question is:  why can not loggin into shell terminal?

The detail log shows in the attachment!