1typeattribute apexd coredomain; 2 3init_daemon_domain(apexd) 4 5# Allow creating, reading and writing of APEX files/dirs in the APEX data dir 6allow apexd apex_data_file:dir create_dir_perms; 7allow apexd apex_data_file:file create_file_perms; 8# Allow relabeling file created in /data/apex/decompressed 9allow apexd apex_data_file:file relabelfrom; 10 11# Allow creating, reading and writing of APEX files/dirs in the APEX metadata dir 12allow apexd metadata_file:dir search; 13allow apexd apex_metadata_file:dir create_dir_perms; 14allow apexd apex_metadata_file:file create_file_perms; 15 16# Allow reserving space on /data/apex/ota_reserved for apex decompression 17allow apexd apex_ota_reserved_file:dir create_dir_perms; 18allow apexd apex_ota_reserved_file:file create_file_perms; 19 20# Allow apexd to create files and directories for snapshots of apex data 21allow apexd apex_data_file_type:dir { create_dir_perms relabelto }; 22allow apexd apex_data_file_type:file { create_file_perms relabelto }; 23allow apexd apex_module_data_file:dir { create_dir_perms relabelfrom }; 24allow apexd apex_module_data_file:file { create_file_perms relabelfrom }; 25allow apexd apex_rollback_data_file:dir create_dir_perms; 26allow apexd apex_rollback_data_file:file create_file_perms; 27 28# Allow apexd to read /data/misc_de and the directories under it, in order to 29# snapshot and restore apex data for all users. 30allow apexd { 31 system_userdir_file 32 system_data_file 33}:dir r_dir_perms; 34 35# allow apexd to create loop devices with /dev/loop-control 36allow apexd loop_control_device:chr_file rw_file_perms; 37# allow apexd to access loop devices 38allow apexd loop_device:blk_file rw_file_perms; 39allowxperm apexd loop_device:blk_file ioctl { 40 LOOP_GET_STATUS64 41 LOOP_SET_STATUS64 42 LOOP_SET_FD 43 LOOP_SET_BLOCK_SIZE 44 LOOP_SET_DIRECT_IO 45 LOOP_CLR_FD 46 BLKFLSBUF 47 LOOP_CONFIGURE 48}; 49# Allow apexd to access /dev/block 50allow apexd dev_type:dir r_dir_perms; 51allow apexd dev_type:blk_file getattr; 52 53#allow apexd to access virtual disks 54allow apexd vd_device:blk_file r_file_perms; 55 56# allow apexd to access /dev/block/dm-* (device-mapper entries) 57allow apexd dm_device:chr_file rw_file_perms; 58allow apexd dm_device:blk_file rw_file_perms; 59 60# sys_admin is required to access the device-mapper and mount 61# dac_override, chown, and fowner are needed for snapshot and restore 62allow apexd self:global_capability_class_set { sys_admin chown dac_override dac_read_search fowner }; 63 64# Note: fsetid is deliberately not included above. fsetid checks are 65# triggered by chmod on a directory or file owned by a group other 66# than one of the groups assigned to the current process to see if 67# the setgid bit should be cleared, regardless of whether the setgid 68# bit was even set. We do not appear to truly need this capability 69# for apexd to operate. 70dontaudit apexd self:global_capability_class_set fsetid; 71 72# allow apexd to create a mount point in /apex 73allow apexd apex_mnt_dir:dir create_dir_perms; 74# allow apexd to mount in /apex 75allow apexd apex_mnt_dir:filesystem { mount unmount }; 76allow apexd apex_mnt_dir:dir mounton; 77# allow apexd to create symlinks in /apex 78allow apexd apex_mnt_dir:lnk_file create_file_perms; 79# allow apexd to create /apex/apex-info-list.xml and relabel to apex_info_file 80allow apexd apex_mnt_dir:file { create_file_perms relabelfrom mounton }; 81allow apexd apex_info_file:file relabelto; 82# apexd needs to update /apex/apex-info-list.xml after non-staged APEX update. 83allow apexd apex_info_file:file rw_file_perms; 84 85# allow apexd to unlink apex files in /data/apex/active 86# note that apexd won't be able to unlink files in /data/app-staging/session_XXXX, 87# because it doesn't have write permission for staging_data_file object. 88allow apexd staging_data_file:file unlink; 89 90# allow apexd to read files from /data/app-staging and hardlink them to /data/apex. 91allow apexd staging_data_file:dir r_dir_perms; 92allow apexd staging_data_file:file { r_file_perms link }; 93# # Allow relabeling file created in /data/apex/decompressed 94allow apexd staging_data_file:file relabelto; 95 96# allow apexd to read files from /vendor/apex 97r_dir_file(apexd, vendor_apex_file) 98r_dir_file(apexd, vendor_apex_metadata_file) 99 100# Unmount and mount filesystems 101allow apexd labeledfs:filesystem { mount unmount }; 102 103# /sys directory tree traversal 104allow apexd sysfs_type:dir search; 105# Access to /sys/class/block 106allow apexd sysfs_type:dir r_dir_perms; 107allow apexd sysfs_type:file r_file_perms; 108# Configure read-ahead of dm-verity and loop devices 109# for dm-X 110allow apexd sysfs_dm:dir r_dir_perms; 111allow apexd sysfs_dm:file rw_file_perms; 112# for loopX 113allow apexd sysfs_loop:dir r_dir_perms; 114allow apexd sysfs_loop:file rw_file_perms; 115 116# Allow apexd to log to the kernel. 117allow apexd kmsg_device:chr_file w_file_perms; 118 119# Allow apexd to reboot device. Required for rollbacks of apexes that are 120# not covered by rollback manager. 121set_prop(apexd, powerctl_prop) 122 123# Allow apexd to stop itself 124set_prop(apexd, ctl_apexd_prop) 125 126# Allow apexd to send control messages to load/unload apex from init 127set_prop(apexd, ctl_apex_load_prop) 128 129# Find the vold service, and call into vold to manage FS checkpoints 130allow apexd vold_service:service_manager find; 131binder_call(apexd, vold) 132 133# apexd is using bootstrap bionic 134use_bootstrap_libs(apexd) 135 136# Allow apexd to be invoked with logwrapper from init during userspace reboot. 137allow apexd devpts:chr_file { read write }; 138 139# Allow apexd to create pts files via logwrap_fork_exec for its own use, to pass to 140# other processes 141create_pty(apexd) 142 143# Allow apexd to read file contexts when performing restorecon of snapshots. 144allow apexd file_contexts_file:file r_file_perms; 145 146# Allow apexd to execute toybox for snapshot & restore 147allow apexd toolbox_exec:file rx_file_perms; 148 149# Allow apexd to release compressed blocks in case /data is f2fs-compressed fs. 150allowxperm apexd staging_data_file:file ioctl { 151 FS_IOC_GETFLAGS 152 F2FS_IOC_RELEASE_COMPRESS_BLOCKS 153}; 154 155# Allow apexd to read ro.cold_boot_done prop. 156# apexd uses it to decide whether it needs to keep retrying polling for loop device. 157get_prop(apexd, cold_boot_done_prop) 158 159# Allow apexd to read per-device configuration properties. 160get_prop(apexd, apexd_config_prop) 161 162# Allow apexd to read apex selection properties. 163# These are used to choose between multi-installed APEXes at activation time. 164get_prop(apexd, apexd_select_prop) 165# 166# Allow apexd to read apexd_payload_metadata_prop 167get_prop(apexd, apexd_payload_metadata_prop) 168 169neverallow { domain -apexd -init } apex_data_file:dir no_w_dir_perms; 170neverallow { domain -apexd -init } apex_metadata_file:dir no_w_dir_perms; 171neverallow { domain -apexd -init -kernel } apex_data_file:file no_w_file_perms; 172neverallow { domain -apexd -init -kernel } apex_metadata_file:file no_w_file_perms; 173neverallow { domain -apexd } apex_mnt_dir:lnk_file no_w_file_perms; 174 175neverallow { domain -apexd -init -vold_prepare_subdirs } apex_module_data_file:dir no_w_dir_perms; 176neverallow { domain -apexd -init -vold_prepare_subdirs } apex_module_data_file:file no_w_file_perms; 177 178neverallow { domain -apexd -init -vold_prepare_subdirs } apex_rollback_data_file:dir no_w_dir_perms; 179neverallow { domain -apexd -init -vold_prepare_subdirs } apex_rollback_data_file:file no_w_file_perms; 180 181# only apexd can set apexd sysprop 182set_prop(apexd, apexd_prop) 183neverallow { domain -apexd -init } apexd_prop:property_service set; 184 185# only apexd can write apex-info-list.xml 186neverallow { domain -apexd } apex_info_file:file no_w_file_perms; 187 188# Only apexd and init should be allowed to manage /apex mounts 189# A note on otapreopt_chroot. It used to mount APEXes during postainstall stage of A/B OTAs, 190# but starting from S it just calls into apexd to prepare /apex for otapreoprt. Once the sepolicies 191# around otapreopt_chroot are cleaned up we should be able to remove it from the lists below. 192neverallow { domain -apexd -init -otapreopt_chroot } apex_mnt_dir:filesystem { mount unmount }; 193neverallow { domain -apexd -init -otapreopt_chroot } apex_mnt_dir:dir { mounton }; 194 195# Allow for use in postinstall 196allow apexd otapreopt_chroot:fd use; 197allow apexd postinstall_apex_mnt_dir:dir { create_dir_perms mounton }; 198allow apexd postinstall_apex_mnt_dir:file { create_file_perms relabelfrom }; 199allow apexd postinstall_apex_mnt_dir:lnk_file create; 200allow apexd proc_filesystems:file r_file_perms; 201 202# Allow calling derive_classpath to gather BCP information for staged sessions 203domain_auto_trans(apexd, derive_classpath_exec, apexd_derive_classpath); 204 205# Allow set apex ready property 206set_prop(apexd, apex_ready_prop) 207