1# init is its own domain. 2type init, domain, mlstrustedsubject; 3type init_exec, system_file_type, exec_type, file_type; 4type init_tmpfs, file_type; 5 6# /dev/__null__ node created by init. 7allow init tmpfs:chr_file { create setattr unlink rw_file_perms }; 8 9# 10# init direct restorecon calls. 11# 12# /dev/kmsg 13allow init tmpfs:chr_file relabelfrom; 14allow init kmsg_device:chr_file { getattr write relabelto }; 15# /dev/kmsg_debug 16userdebug_or_eng(` 17 allow init kmsg_debug_device:chr_file { open write relabelto }; 18') 19 20# allow init to mount and unmount debugfs in debug builds 21userdebug_or_eng(` 22 allow init debugfs:dir mounton; 23') 24 25# /dev/__properties__ 26allow init properties_device:dir relabelto; 27allow init properties_serial:file { write relabelto }; 28allow init property_type:file { append create getattr map open read relabelto rename setattr unlink write }; 29# /dev/__properties__/property_info 30allow init properties_device:file create_file_perms; 31allow init property_info:file relabelto; 32# /dev/event-log-tags 33allow init device:file relabelfrom; 34allow init runtime_event_log_tags_file:file { open write setattr relabelto create }; 35# /dev/socket 36allow init { device socket_device dm_user_device }:dir relabelto; 37# allow init to establish connection and communicate with lmkd 38unix_socket_connect(init, lmkd, lmkd) 39# Relabel /dev nodes created in first stage init: /dev/console, /dev/null, /dev/ptmx, /dev/random 40# and /dev/urandom 41allow init { console_device null_device ptmx_device random_device } : chr_file relabelto; 42# /dev/device-mapper, /dev/block(/.*)? 43allow init tmpfs:{ chr_file blk_file } relabelfrom; 44allow init tmpfs:blk_file getattr; 45allow init block_device:{ dir blk_file lnk_file } relabelto; 46allow init dm_device:{ chr_file blk_file } relabelto; 47allow init dm_user_device:chr_file relabelto; 48allow init kernel:fd use; 49# restorecon for early mount device symlinks 50allow init tmpfs:lnk_file { getattr read relabelfrom }; 51allow init { 52 metadata_block_device 53 misc_block_device 54 recovery_block_device 55 system_block_device 56 userdata_block_device 57}:{ blk_file lnk_file } relabelto; 58 59allow init super_block_device:lnk_file relabelto; 60 61# Create /mnt/sdcard -> /storage/self/primary symlink. 62allow init mnt_sdcard_file:lnk_file create; 63 64# setrlimit 65allow init self:global_capability_class_set sys_resource; 66 67# Remove /dev/.booting and load /debug_ramdisk/* files 68allow init tmpfs:file { getattr unlink }; 69 70# Access pty created for fsck. 71allow init devpts:chr_file { read write open }; 72 73# Create /dev/fscklogs files. 74allow init fscklogs:file create_file_perms; 75 76# Access /dev/__null__ node created prior to initial policy load. 77allow init tmpfs:chr_file write; 78 79# Access /dev/console. 80allow init console_device:chr_file rw_file_perms; 81 82# Access /dev/tty0. 83allow init tty_device:chr_file rw_file_perms; 84 85# Call mount(2). 86allow init self:global_capability_class_set sys_admin; 87 88# Call setns(2). 89allow init self:global_capability_class_set sys_chroot; 90 91# Create and mount on directories in /. 92allow init rootfs:dir create_dir_perms; 93allow init { 94 rootfs 95 cache_file 96 cgroup 97 linkerconfig_file 98 storage_file 99 mnt_user_file 100 system_data_file 101 system_data_root_file 102 system_dlkm_file 103 system_file 104 vendor_file 105 postinstall_mnt_dir 106 mirror_data_file 107}:dir mounton; 108 109# Mount bpf fs on sys/fs/bpf 110allow init fs_bpf:dir mounton; 111 112# Mount on /dev/usb-ffs/adb. 113allow init device:dir mounton; 114 115# Mount tmpfs on /apex 116allow init apex_mnt_dir:dir mounton; 117 118# Bind-mount on /system/apex/com.android.art 119allow init art_apex_dir:dir mounton; 120 121# Create and remove symlinks in /. 122allow init rootfs:lnk_file { create unlink }; 123 124# Mount debugfs on /sys/kernel/debug. 125allow init sysfs:dir mounton; 126 127# Create cgroups mount points in tmpfs and mount cgroups on them. 128allow init tmpfs:dir create_dir_perms; 129allow init tmpfs:dir mounton; 130allow init cgroup:dir create_dir_perms; 131allow init cgroup:file rw_file_perms; 132allow init cgroup_rc_file:file rw_file_perms; 133allow init cgroup_desc_file:file r_file_perms; 134allow init cgroup_desc_api_file:file r_file_perms; 135allow init vendor_cgroup_desc_file:file r_file_perms; 136allow init cgroup_v2:dir { mounton create_dir_perms}; 137allow init cgroup_v2:file rw_file_perms; 138 139# /config 140allow init configfs:dir mounton; 141allow init configfs:dir create_dir_perms; 142allow init configfs:{ file lnk_file } create_file_perms; 143 144# /metadata 145allow init metadata_file:dir mounton; 146 147# Run restorecon on /dev 148allow init tmpfs:dir relabelfrom; 149 150# Create directories under /dev/cpuctl after chowning it to system. 151allow init self:global_capability_class_set { dac_override dac_read_search }; 152 153# Set system clock. 154allow init self:global_capability_class_set sys_time; 155 156allow init self:global_capability_class_set { sys_rawio mknod }; 157 158# Mounting filesystems from block devices. 159allow init dev_type:blk_file r_file_perms; 160allowxperm init dev_type:blk_file ioctl BLKROSET; 161 162# Mounting filesystems. 163# Only allow relabelto for types used in context= mount options, 164# which should all be assigned the contextmount_type attribute. 165# This can be done in device-specific policy via type or typeattribute 166# declarations. 167allow init { 168 fs_type 169 enforce_debugfs_restriction(`-debugfs_type') 170}:filesystem ~relabelto; 171 172# Allow init to mount/unmount debugfs in non-user builds. 173enforce_debugfs_restriction(` 174 userdebug_or_eng(`allow init debugfs_type:filesystem { mount unmount };') 175') 176 177# Allow init to mount tracefs in /sys/kernel/tracing 178allow init debugfs_tracing_debug:filesystem mount; 179 180allow init unlabeled:filesystem ~relabelto; 181allow init contextmount_type:filesystem relabelto; 182 183# Allow read-only access to context= mounted filesystems. 184allow init contextmount_type:dir r_dir_perms; 185allow init contextmount_type:notdevfile_class_set r_file_perms; 186 187# restorecon /adb_keys or any other rootfs files and directories to a more 188# specific type. 189allow init rootfs:{ dir file } relabelfrom; 190 191# mkdir, symlink, write, rm/rmdir, chown/chmod, restorecon/restorecon_recursive from init.rc files. 192# chown/chmod require open+read+setattr required for open()+fchown/fchmod(). 193# system/core/init.rc requires at least cache_file and data_file_type. 194# init.<board>.rc files often include device-specific types, so 195# we just allow all file types except /system files here. 196allow init self:global_capability_class_set { chown fowner fsetid }; 197 198allow init { 199 file_type 200 -app_data_file 201 -exec_type 202 -misc_logd_file 203 -nativetest_data_file 204 -privapp_data_file 205 -system_app_data_file 206 -system_dlkm_file_type 207 -system_file_type 208 -vendor_file_type 209}:dir { create search getattr open read setattr ioctl }; 210 211allow init { 212 file_type 213 -app_data_file 214 -exec_type 215 -iorapd_data_file 216 -credstore_data_file 217 -keystore_data_file 218 -misc_logd_file 219 -nativetest_data_file 220 -privapp_data_file 221 -shell_data_file 222 -system_app_data_file 223 -system_dlkm_file_type 224 -system_file_type 225 -vendor_file_type 226 -vold_data_file 227}:dir { write add_name remove_name rmdir relabelfrom }; 228 229allow init { 230 file_type 231 -apex_info_file 232 -app_data_file 233 -exec_type 234 -gsi_data_file 235 -iorapd_data_file 236 -credstore_data_file 237 -keystore_data_file 238 -misc_logd_file 239 -nativetest_data_file 240 -privapp_data_file 241 -runtime_event_log_tags_file 242 -shell_data_file 243 -system_app_data_file 244 -system_dlkm_file_type 245 -system_file_type 246 -vendor_file_type 247 -vold_data_file 248 enforce_debugfs_restriction(`-debugfs_type') 249}:file { create getattr open read write setattr relabelfrom unlink map }; 250 251allow init tracefs_type:file { create_file_perms relabelfrom }; 252 253allow init { 254 file_type 255 -app_data_file 256 -exec_type 257 -gsi_data_file 258 -iorapd_data_file 259 -credstore_data_file 260 -keystore_data_file 261 -misc_logd_file 262 -nativetest_data_file 263 -privapp_data_file 264 -shell_data_file 265 -system_app_data_file 266 -system_dlkm_file_type 267 -system_file_type 268 -vendor_file_type 269 -vold_data_file 270}:{ sock_file fifo_file } { create getattr open read setattr relabelfrom unlink }; 271 272allow init { 273 file_type 274 -apex_mnt_dir 275 -app_data_file 276 -exec_type 277 -gsi_data_file 278 -iorapd_data_file 279 -credstore_data_file 280 -keystore_data_file 281 -misc_logd_file 282 -nativetest_data_file 283 -privapp_data_file 284 -shell_data_file 285 -system_app_data_file 286 -system_dlkm_file_type 287 -system_file_type 288 -vendor_file_type 289 -vold_data_file 290}:lnk_file { create getattr setattr relabelfrom unlink }; 291 292allow init cache_file:lnk_file r_file_perms; 293 294allow init { 295 file_type 296 -system_dlkm_file_type 297 -system_file_type 298 -vendor_file_type 299 -exec_type 300 -app_data_file 301 -privapp_data_file 302}:dir_file_class_set relabelto; 303 304allow init { sysfs no_debugfs_restriction(`debugfs') debugfs_tracing debugfs_tracing_debug }:{ dir file lnk_file } { getattr relabelfrom }; 305allow init { sysfs_type no_debugfs_restriction(`debugfs_type') tracefs_type }:{ dir file lnk_file } { relabelto getattr }; 306allow init dev_type:dir create_dir_perms; 307allow init dev_type:lnk_file create; 308 309# Disable tracing by writing to /sys/kernel/debug/tracing/tracing_on 310allow init debugfs_tracing:file w_file_perms; 311 312# Setup and control wifi event tracing (see wifi-events.rc) 313allow init debugfs_tracing_instances:dir create_dir_perms; 314allow init debugfs_tracing_instances:file w_file_perms; 315allow init debugfs_wifi_tracing:file w_file_perms; 316 317# chown/chmod on pseudo files. 318allow init { 319 fs_type 320 -contextmount_type 321 -keychord_device 322 -proc_type 323 -sdcard_type 324 -fusefs_type 325 -sysfs_type 326 -rootfs 327 enforce_debugfs_restriction(`-debugfs_type') 328}:file { open read setattr }; 329allow init { fs_type -contextmount_type -sdcard_type -fusefs_type -rootfs }:dir { open read setattr search }; 330 331allow init { 332 binder_device 333 console_device 334 devpts 335 dm_device 336 hwbinder_device 337 input_device 338 kmsg_device 339 null_device 340 owntty_device 341 pmsg_device 342 ptmx_device 343 random_device 344 tty_device 345 zero_device 346}:chr_file { read open }; 347 348# Unlabeled file access for upgrades from 4.2. 349allow init unlabeled:dir { create_dir_perms relabelfrom }; 350allow init unlabeled:notdevfile_class_set { create_file_perms relabelfrom }; 351 352# Any operation that can modify the kernel ring buffer, e.g. clear 353# or a read that consumes the messages that were read. 354allow init kernel:system syslog_mod; 355allow init self:global_capability2_class_set syslog; 356 357# init access to /proc. 358r_dir_file(init, proc_net_type) 359allow init proc_filesystems:file r_file_perms; 360 361userdebug_or_eng(` 362 # Overlayfs workdir write access check during mount to permit remount,rw 363 allow init overlayfs_file:dir { relabelfrom mounton write }; 364 allow init overlayfs_file:file { append }; 365 allow init system_block_device:blk_file { write }; 366') 367 368allow init { 369 proc # b/67049235 processes /proc/<pid>/* files are mislabeled. 370 proc_bootconfig 371 proc_cmdline 372 proc_diskstats 373 proc_kmsg # Open /proc/kmsg for logd service. 374 proc_meminfo 375 proc_stat # Read /proc/stat for bootchart. 376 proc_uptime 377 proc_version 378}:file r_file_perms; 379 380allow init { 381 proc_abi 382 proc_bpf 383 proc_cpu_alignment 384 proc_dirty 385 proc_hostname 386 proc_hung_task 387 proc_extra_free_kbytes 388 proc_net_type 389 proc_max_map_count 390 proc_min_free_order_shift 391 proc_overcommit_memory # /proc/sys/vm/overcommit_memory 392 proc_panic 393 proc_page_cluster 394 proc_perf 395 proc_sched 396 proc_sysrq 397 proc_watermark_boost_factor 398}:file w_file_perms; 399 400allow init { 401 proc_security 402}:file rw_file_perms; 403 404# init chmod/chown access to /proc files. 405allow init { 406 proc_cmdline 407 proc_bootconfig 408 proc_kmsg 409 proc_net 410 proc_pagetypeinfo 411 proc_qtaguid_stat 412 proc_slabinfo 413 proc_sysrq 414 proc_qtaguid_ctrl 415 proc_vmallocinfo 416}:file setattr; 417 418# init access to /sys files. 419allow init { 420 sysfs_android_usb 421 sysfs_dm_verity 422 sysfs_leds 423 sysfs_power 424 sysfs_fs_f2fs 425 sysfs_dm 426 sysfs_lru_gen_enabled 427}:file w_file_perms; 428 429allow init { 430 sysfs_dt_firmware_android 431 sysfs_fs_ext4_features 432}:file r_file_perms; 433 434allow init { 435 sysfs_zram 436}:file rw_file_perms; 437 438# allow init to create loop devices with /dev/loop-control 439allow init loop_control_device:chr_file rw_file_perms; 440allow init loop_device:blk_file rw_file_perms; 441allowxperm init loop_device:blk_file ioctl { 442 LOOP_SET_FD 443 LOOP_CLR_FD 444 LOOP_CTL_GET_FREE 445 LOOP_SET_BLOCK_SIZE 446 LOOP_SET_DIRECT_IO 447 LOOP_GET_STATUS 448 LOOP_SET_STATUS64 449}; 450 451# Allow init to write to vibrator/trigger 452allow init sysfs_vibrator:file w_file_perms; 453 454# init chmod/chown access to /sys files. 455allow init { 456 sysfs_android_usb 457 sysfs_devices_system_cpu 458 sysfs_ipv4 459 sysfs_leds 460 sysfs_lowmemorykiller 461 sysfs_power 462 sysfs_vibrator 463 sysfs_wake_lock 464 sysfs_zram 465}:file setattr; 466 467# Set usermodehelpers. 468allow init { usermodehelper sysfs_usermodehelper }:file rw_file_perms; 469 470allow init self:global_capability_class_set net_admin; 471 472# Reboot. 473allow init self:global_capability_class_set sys_boot; 474 475# Init will create /data/misc/logd when the property persist.logd.logpersistd is "logcatd". 476# Init will also walk through the directory as part of a recursive restorecon. 477allow init misc_logd_file:dir { add_name open create read getattr setattr search write }; 478allow init misc_logd_file:file { open create getattr setattr write }; 479 480# Support "adb shell stop" 481allow init self:global_capability_class_set kill; 482allow init domain:process { getpgid sigkill signal }; 483 484# Init creates credstore's directory on boot, and walks through 485# the directory as part of a recursive restorecon. 486allow init credstore_data_file:dir { open create read getattr setattr search }; 487allow init credstore_data_file:file { getattr }; 488 489# Init creates keystore's directory on boot, and walks through 490# the directory as part of a recursive restorecon. 491allow init keystore_data_file:dir { open create read getattr setattr search }; 492allow init keystore_data_file:file { getattr }; 493 494# Init creates vold's directory on boot, and walks through 495# the directory as part of a recursive restorecon. 496allow init vold_data_file:dir { open create read getattr setattr search }; 497allow init vold_data_file:file { getattr }; 498 499# Init creates /data/local/tmp at boot 500allow init shell_data_file:dir { open create read getattr setattr search }; 501allow init shell_data_file:file { getattr }; 502 503# Set UID, GID, and adjust capability bounding set for services. 504allow init self:global_capability_class_set { setuid setgid setpcap }; 505 506# For bootchart to read the /proc/$pid/cmdline file of each process, 507# we need to have following line to allow init to have access 508# to different domains. 509r_dir_file(init, domain) 510 511# Use setexeccon(), setfscreatecon(), and setsockcreatecon(). 512# setexec is for services with seclabel options. 513# setfscreate is for labeling directories and socket files. 514# setsockcreate is for labeling local/unix domain sockets. 515allow init self:process { setexec setfscreate setsockcreate }; 516 517# Get file context 518allow init file_contexts_file:file r_file_perms; 519 520# sepolicy access 521allow init sepolicy_file:file r_file_perms; 522 523# Perform SELinux access checks on setting properties. 524selinux_check_access(init) 525 526# Ask the kernel for the new context on services to label their sockets. 527allow init kernel:security compute_create; 528 529# Create sockets for the services. 530allow init domain:unix_stream_socket { create bind setopt }; 531allow init domain:unix_dgram_socket { create bind setopt }; 532 533# Create /data/property and files within it. 534allow init property_data_file:dir create_dir_perms; 535allow init property_data_file:file create_file_perms; 536 537# Set any property. 538allow init property_type:property_service set; 539 540# Send an SELinux userspace denial to the kernel audit subsystem, 541# so it can be picked up and processed by logd. These denials are 542# generated when an attempt to set a property is denied by policy. 543allow init self:netlink_audit_socket { create_socket_perms_no_ioctl nlmsg_relay }; 544allow init self:global_capability_class_set audit_write; 545 546# Run "ifup lo" to bring up the localhost interface 547allow init self:udp_socket { create ioctl }; 548# in addition to unpriv ioctls granted to all domains, init also needs: 549allowxperm init self:udp_socket ioctl SIOCSIFFLAGS; 550allow init self:global_capability_class_set net_raw; 551 552# Set scheduling info for psi monitor thread. 553# TODO: delete or revise this line b/131761776 554allow init kernel:process { getsched setsched }; 555 556# swapon() needs write access to swap device 557# system/core/fs_mgr/fs_mgr.c - fs_mgr_swapon_all 558allow init swap_block_device:blk_file rw_file_perms; 559 560# Create and access /dev files without a specific type, 561# e.g. /dev/.coldboot_done, /dev/.booting 562# TODO: Move these files into their own type unless they are 563# only ever accessed by init. 564allow init device:file create_file_perms; 565 566# keychord retrieval from /dev/input/ devices 567allow init input_device:dir r_dir_perms; 568allow init input_device:chr_file rw_file_perms; 569 570# Access device mapper for setting up dm-verity 571allow init dm_device:chr_file rw_file_perms; 572allow init dm_device:blk_file rw_file_perms; 573 574# Access dm-user for OTA boot 575allow init dm_user_device:chr_file rw_file_perms; 576 577# Access metadata block device for storing dm-verity state 578allow init metadata_block_device:blk_file rw_file_perms; 579 580# Read /sys/fs/pstore/console-ramoops to detect restarts caused 581# by dm-verity detecting corrupted blocks 582allow init pstorefs:dir search; 583allow init pstorefs:file r_file_perms; 584allow init kernel:system syslog_read; 585 586# linux keyring configuration 587allow init init:key { write search setattr }; 588 589# Allow init to create /data/unencrypted 590allow init unencrypted_data_file:dir create_dir_perms; 591 592# Set encryption policy on dirs in /data 593allowxperm init { data_file_type unlabeled }:dir ioctl { 594 FS_IOC_GET_ENCRYPTION_POLICY 595 FS_IOC_SET_ENCRYPTION_POLICY 596}; 597 598# Raw writes to misc block device 599allow init misc_block_device:blk_file w_file_perms; 600 601r_dir_file(init, system_file) 602r_dir_file(init, system_dlkm_file_type) 603r_dir_file(init, vendor_file_type) 604 605allow init system_data_file:file { getattr read }; 606allow init system_data_file:lnk_file r_file_perms; 607 608# For init to be able to run shell scripts from vendor 609allow init vendor_shell_exec:file execute; 610 611# Metadata setup 612allow init vold_metadata_file:dir create_dir_perms; 613allow init vold_metadata_file:file getattr; 614allow init metadata_bootstat_file:dir create_dir_perms; 615allow init metadata_bootstat_file:file w_file_perms; 616allow init userspace_reboot_metadata_file:file w_file_perms; 617 618# Allow init to touch PSI monitors 619allow init proc_pressure_mem:file { rw_file_perms setattr }; 620 621# init is using bootstrap bionic 622use_bootstrap_libs(init) 623 624# stat the root dir of fuse filesystems (for the mount handler) 625allow init fuse:dir { search getattr }; 626 627# allow filesystem tuning 628allow init userdata_sysdev:file create_file_perms; 629 630# allow disk tuning 631allow init rootdisk_sysdev:file create_file_perms; 632 633### 634### neverallow rules 635### 636 637# The init domain is only entered via an exec based transition from the 638# kernel domain, never via setcon(). 639neverallow domain init:process dyntransition; 640neverallow { domain -kernel } init:process transition; 641neverallow init { file_type fs_type -init_exec }:file entrypoint; 642 643# Never read/follow symlinks created by shell or untrusted apps. 644neverallow init shell_data_file:lnk_file read; 645neverallow init { app_data_file privapp_data_file }:lnk_file read; 646 647# init should never execute a program without changing to another domain. 648neverallow init { file_type fs_type }:file execute_no_trans; 649 650# The use of sensitive environment variables, such as LD_PRELOAD, is disallowed 651# when init is executing other binaries. The use of LD_PRELOAD for init spawned 652# services is generally considered a no-no, as it injects libraries which the 653# binary was not expecting. This is especially problematic for APEXes. The use 654# of LD_PRELOAD via APEXes is a layering violation, and inappropriately loads 655# code into a process which wasn't expecting that code, with potentially 656# unexpected side effects. (b/140789528) 657neverallow init *:process noatsecure; 658 659# init can never add binder services 660neverallow init service_manager_type:service_manager { add find }; 661# init can never list binder services 662neverallow init servicemanager:service_manager list; 663 664# Init should not be creating subdirectories in /data/local/tmp 665neverallow init shell_data_file:dir { write add_name remove_name }; 666 667# Init should not access sysfs node that are not explicitly labeled. 668neverallow init sysfs:file { open write }; 669 670# No domain should be allowed to ptrace init. 671neverallow * init:process ptrace; 672 673# init owns the root of /data 674# TODO(b/140259336) We want to remove vendor_init 675# TODO(b/141108496) We want to remove toolbox 676neverallow { domain -init -toolbox -vendor_init -vold } system_data_root_file:dir { write add_name remove_name }; 677