dumpstate.te

# dumpstate
type dumpstate, domain, mlstrustedsubject;
type dumpstate_exec, exec_type, file_type;

net_domain(dumpstate)
binder_use(dumpstate)
wakelock_use(dumpstate)

# Allow setting process priority, protect from OOM killer, and dropping
# privileges by switching UID / GID
allow dumpstate self:global_capability_class_set { setuid setgid sys_resource };

# Allow dumpstate to scan through /proc/pid for all processes
r_dir_file(dumpstate, domain)

allow dumpstate self:global_capability_class_set {
    # Send signals to processes
    kill
    # Run iptables
    net_raw
    net_admin
};

# Allow executing files on system, such as:
#   /system/bin/toolbox
#   /system/bin/logcat
#   /system/bin/dumpsys
allow dumpstate system_file:file execute_no_trans;
not_full_treble(`allow dumpstate vendor_file:file execute_no_trans;')
allow dumpstate toolbox_exec:file rx_file_perms;

# hidl searches for files in /system/lib(64)/hw/
allow dumpstate system_file:dir r_dir_perms;

# Create and write into /data/anr/
allow dumpstate self:global_capability_class_set { dac_override chown fowner fsetid };
allow dumpstate anr_data_file:dir rw_dir_perms;
allow dumpstate anr_data_file:file create_file_perms;

# Allow reading /data/system/uiderrors.txt
# TODO: scope this down.
allow dumpstate system_data_file:file r_file_perms;

# Read dmesg
allow dumpstate self:global_capability2_class_set syslog;
allow dumpstate kernel:system syslog_read;

# Read /sys/fs/pstore/console-ramoops
allow dumpstate pstorefs:dir r_dir_perms;
allow dumpstate pstorefs:file r_file_perms;

# Get process attributes
allow dumpstate domain:process getattr;

# Signal java processes to dump their stack
allow dumpstate { appdomain system_server }:process signal;

# Signal native processes to dump their stack.
allow dumpstate {
  # This list comes from native_processes_to_dump in dumputils/dump_utils.c
  audioserver
  cameraserver
  drmserver
  inputflinger
  mediadrmserver
  mediaextractor
  mediametrics
  mediaserver
  sdcardd
  surfaceflinger

  # This list comes from hal_interfaces_to_dump in dumputils/dump_utils.c
  hal_audio_server
  hal_bluetooth_server
  hal_camera_server
  hal_drm_server
  hal_graphics_composer_server
  hal_sensors_server
  hal_vr_server
  mediacodec # TODO(b/36375899): hal_omx_server
}:process signal;

# Connect to tombstoned to intercept dumps.
unix_socket_connect(dumpstate, tombstoned_intercept, tombstoned)

# Access to /sys
allow dumpstate sysfs_type:dir r_dir_perms;

allow dumpstate {
  sysfs_dm
  sysfs_usb
  sysfs_zram
}:file r_file_perms;

# Other random bits of data we want to collect
allow dumpstate qtaguid_proc:file r_file_perms;
allow dumpstate debugfs:file r_file_perms;

# df for
allow dumpstate {
  block_device
  cache_file
  rootfs
  selinuxfs
  storage_file
  tmpfs
}:dir { search getattr };
allow dumpstate fuse_device:chr_file getattr;
allow dumpstate { dm_device cache_block_device }:blk_file getattr;
allow dumpstate { cache_file rootfs }:lnk_file { getattr read };

# Read /dev/cpuctl and /dev/cpuset
r_dir_file(dumpstate, cgroup)

# Allow dumpstate to make binder calls to any binder service
binder_call(dumpstate, binderservicedomain)
binder_call(dumpstate, { appdomain netd wificond })

hal_client_domain(dumpstate, hal_dumpstate)
hal_client_domain(dumpstate, hal_graphics_allocator)
# Vibrate the device after we are done collecting the bugreport
hal_client_domain(dumpstate, hal_vibrator)

# Reading /proc/PID/maps of other processes
allow dumpstate self:global_capability_class_set sys_ptrace;

# Allow the bugreport service to create a file in
# /data/data/com.android.shell/files/bugreports/bugreport
allow dumpstate shell_data_file:dir create_dir_perms;
allow dumpstate shell_data_file:file create_file_perms;

# Run a shell.
allow dumpstate shell_exec:file rx_file_perms;

# For running am and similar framework commands.
# Run /system/bin/app_process.
allow dumpstate zygote_exec:file rx_file_perms;
# Dalvik Compiler JIT.
allow dumpstate ashmem_device:chr_file execute;
allow dumpstate self:process execmem;
# For art.
allow dumpstate dalvikcache_data_file:dir { search getattr };
allow dumpstate dalvikcache_data_file:file { r_file_perms execute };
allow dumpstate dalvikcache_data_file:lnk_file r_file_perms;

# For Bluetooth
allow dumpstate bluetooth_data_file:dir search;
allow dumpstate bluetooth_logs_data_file:dir r_dir_perms;
allow dumpstate bluetooth_logs_data_file:file r_file_perms;

# Dumpstate calls screencap, which grabs a screenshot. Needs gpu access
allow dumpstate gpu_device:chr_file rw_file_perms;

# logd access
read_logd(dumpstate)
control_logd(dumpstate)
read_runtime_log_tags(dumpstate)

# Read files in /proc
allow dumpstate {
  proc_buddyinfo
  proc_cmdline
  proc_meminfo
  proc_modules
  proc_net
  proc_pipe_conf
  proc_pagetypeinfo
  proc_qtaguid_stat
  proc_version
  proc_vmallocinfo
  proc_vmstat
}:file r_file_perms;

# Read network state info files.
allow dumpstate net_data_file:dir search;
allow dumpstate net_data_file:file r_file_perms;

# List sockets via ss.
allow dumpstate self:netlink_tcpdiag_socket { create_socket_perms_no_ioctl nlmsg_read };

# Access /data/tombstones.
allow dumpstate tombstone_data_file:dir r_dir_perms;
allow dumpstate tombstone_data_file:file r_file_perms;

# Access /cache/recovery
allow dumpstate cache_recovery_file:dir r_dir_perms;
allow dumpstate cache_recovery_file:file r_file_perms;

# Access /data/misc/recovery
allow dumpstate recovery_data_file:dir r_dir_perms;
allow dumpstate recovery_data_file:file r_file_perms;

# Access /data/misc/profiles/{cur,ref}/
userdebug_or_eng(`
  allow dumpstate user_profile_data_file:dir r_dir_perms;
  allow dumpstate user_profile_data_file:file r_file_perms;
')

# Access /data/misc/logd
userdebug_or_eng(`
  allow dumpstate misc_logd_file:dir r_dir_perms;
  allow dumpstate misc_logd_file:file r_file_perms;
')

allow dumpstate {
  service_manager_type
  -dumpstate_service
  -gatekeeper_service
  -incident_service
  -virtual_touchpad_service
  -vold_service
  -vr_hwc_service
}:service_manager find;
# suppress denials for services dumpstate should not be accessing.
dontaudit dumpstate {
  dumpstate_service
  gatekeeper_service
  incident_service
  virtual_touchpad_service
  vold_service
  vr_hwc_service
}:service_manager find;

allow dumpstate servicemanager:service_manager list;
allow dumpstate hwservicemanager:hwservice_manager list;

allow dumpstate devpts:chr_file rw_file_perms;

# Set properties.
# dumpstate_prop is used to share state with the Shell app.
set_prop(dumpstate, dumpstate_prop)
set_prop(dumpstate, exported_dumpstate_prop)
# dumpstate_options_prop is used to pass extra command-line args.
set_prop(dumpstate, dumpstate_options_prop)

# Read device's serial number from system properties
get_prop(dumpstate, serialno_prop)

# Read state of logging-related properties
get_prop(dumpstate, device_logging_prop)

# Read state of boot reason properties
get_prop(dumpstate, bootloader_boot_reason_prop)
get_prop(dumpstate, last_boot_reason_prop)
get_prop(dumpstate, system_boot_reason_prop)

# Access to /data/media.
# This should be removed if sdcardfs is modified to alter the secontext for its
# accesses to the underlying FS.
allow dumpstate media_rw_data_file:dir getattr;
allow dumpstate proc_interrupts:file r_file_perms;
allow dumpstate proc_zoneinfo:file r_file_perms;

# Create a service for talking back to system_server
add_service(dumpstate, dumpstate_service)

# use /dev/ion for screen capture
allow dumpstate ion_device:chr_file r_file_perms;

# Allow dumpstate to run top
allow dumpstate proc_stat:file r_file_perms;

# Allow dumpstate to talk to installd over binder
binder_call(dumpstate, installd);

# Allow dumpstate to run ip xfrm policy
allow dumpstate self:netlink_xfrm_socket { create_socket_perms_no_ioctl nlmsg_read };

# Allow dumpstate to run iotop
allow dumpstate self:netlink_socket create_socket_perms_no_ioctl;
# newer kernels (e.g. 4.4) have a new class for sockets
allow dumpstate self:netlink_generic_socket create_socket_perms_no_ioctl;

# Allow dumpstate to kill vendor dumpstate service by init
set_prop(dumpstate, ctl_dumpstate_prop)

###
### neverallow rules
###

# dumpstate has capability sys_ptrace, but should only use that capability for
# accessing sensitive /proc/PID files, never for using ptrace attach.
neverallow dumpstate *:process ptrace;

# only system_server, dumpstate, traceur_app and shell can find the dumpstate service
neverallow {
  domain
  -system_server
  -shell
  -traceur_app
  -dumpstate
} dumpstate_service:service_manager find;