b8b4f5d649
Remove a number of SELinux rules which were required to support file based OTA. After this, we can have a much stronger assertion that files on /system are immutable. Tighten up the neverallow rules at the same time. Bug: 35853185 Bug: 15575013 Bug: 69664758 Test: adb reboot recovery && adb sideload [file] Change-Id: I22aa208859b8478a2a90e1ed1c0f0d6b62a6664e
147 lines
4.7 KiB
Text
147 lines
4.7 KiB
Text
# recovery console (used in recovery init.rc for /sbin/recovery)
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# Declare the domain unconditionally so we can always reference it
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# in neverallow rules.
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type recovery, domain;
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# But the allow rules are only included in the recovery policy.
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# Otherwise recovery is only allowed the domain rules.
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recovery_only(`
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# Allow recovery to perform an update as update_engine would do.
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typeattribute recovery update_engine_common;
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# Recovery can only use HALs in passthrough mode
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passthrough_hal_client_domain(recovery, hal_bootctl)
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allow recovery self:global_capability_class_set { dac_override fowner setuid setgid sys_admin sys_tty_config };
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# Run helpers from / or /system without changing domain.
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r_dir_file(recovery, rootfs)
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allow recovery rootfs:file execute_no_trans;
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allow recovery system_file:file execute_no_trans;
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allow recovery toolbox_exec:file rx_file_perms;
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# Mount filesystems.
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allow recovery rootfs:dir mounton;
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allow recovery fs_type:filesystem ~relabelto;
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allow recovery unlabeled:filesystem ~relabelto;
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allow recovery contextmount_type:filesystem relabelto;
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# Get file contexts
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allow recovery file_contexts_file:file r_file_perms;
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# Write to /proc/sys/vm/drop_caches
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allow recovery proc_drop_caches:file w_file_perms;
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# Read /proc/swaps
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allow recovery proc_swaps:file r_file_perms;
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# Read kernel config through libvintf for OTA matching
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allow recovery config_gz:file { open read getattr };
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# Write to /sys/class/android_usb/android0/enable.
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r_dir_file(recovery, sysfs_android_usb)
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allow recovery sysfs_android_usb:file w_file_perms;
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# Write to /sys/devices/system/cpu/cpu0/cpufreq/scaling_max_freq.
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allow recovery sysfs_devices_system_cpu:file w_file_perms;
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allow recovery sysfs_batteryinfo:file r_file_perms;
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# Read /sysfs/fs/ext4/features
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r_dir_file(recovery, sysfs_fs_ext4_features)
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# Read from /sys/class/leds/lcd-backlight/max_brightness and write to /s/c/l/l/brightness to
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# control backlight brightness.
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allow recovery sysfs_leds:dir r_dir_perms;
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allow recovery sysfs_leds:file rw_file_perms;
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allow recovery sysfs_leds:lnk_file read;
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allow recovery kernel:system syslog_read;
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# Access /dev/usb-ffs/adb/ep0
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allow recovery functionfs:dir search;
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allow recovery functionfs:file rw_file_perms;
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# Access to /sys/fs/selinux/policyvers for compatibility check
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allow recovery selinuxfs:file r_file_perms;
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# Required to e.g. wipe userdata/cache.
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allow recovery device:dir r_dir_perms;
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allow recovery block_device:dir r_dir_perms;
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allow recovery dev_type:blk_file rw_file_perms;
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# GUI
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allow recovery graphics_device:chr_file rw_file_perms;
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allow recovery graphics_device:dir r_dir_perms;
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allow recovery input_device:dir r_dir_perms;
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allow recovery input_device:chr_file r_file_perms;
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allow recovery tty_device:chr_file rw_file_perms;
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# Create /tmp/recovery.log and execute /tmp/update_binary.
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allow recovery tmpfs:file { create_file_perms x_file_perms };
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allow recovery tmpfs:dir create_dir_perms;
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# Manage files on /cache and /cache/recovery
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allow recovery { cache_file cache_recovery_file }:dir create_dir_perms;
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allow recovery { cache_file cache_recovery_file }:file create_file_perms;
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# Read /sys/class/thermal/*/temp for thermal info.
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r_dir_file(recovery, sysfs_thermal)
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# Read files on /oem.
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r_dir_file(recovery, oemfs);
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# Reboot the device
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set_prop(recovery, powerctl_prop)
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# Start/stop adbd via ctl.start adbd
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set_prop(recovery, ctl_default_prop)
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# Read serial number of the device from system properties
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get_prop(recovery, serialno_prop)
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# Set sys.usb.ffs.ready when starting minadbd for sideload.
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set_prop(recovery, ffs_prop)
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# Read ro.boot.bootreason
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get_prop(recovery, bootloader_boot_reason_prop)
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# Use setfscreatecon() to label files for OTA updates.
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allow recovery self:process setfscreate;
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# Allow recovery to create a fuse filesystem, and read files from it.
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allow recovery fuse_device:chr_file rw_file_perms;
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allow recovery fuse:dir r_dir_perms;
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allow recovery fuse:file r_file_perms;
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wakelock_use(recovery)
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# This line seems suspect, as it should not really need to
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# set scheduling parameters for a kernel domain task.
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allow recovery kernel:process setsched;
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')
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###
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### neverallow rules
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###
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# Recovery should never touch /data.
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#
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# In particular, if /data is encrypted, it is not accessible
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# to recovery anyway.
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#
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# For now, we only enforce write/execute restrictions, as domain.te
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# contains a number of read-only rules that apply to all
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# domains, including recovery.
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#
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# TODO: tighten this up further.
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neverallow recovery {
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data_file_type
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-cache_file
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-cache_recovery_file
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}:file { no_w_file_perms no_x_file_perms };
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neverallow recovery {
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data_file_type
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-cache_file
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-cache_recovery_file
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}:dir no_w_dir_perms;
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