platform_system_sepolicy/private/bootstat.te

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typeattribute bootstat coredomain;
init_daemon_domain(bootstat)
# Collect metrics on boot time created by init
get_prop(bootstat, boottime_prop)
# Read/Write [persist.]sys.boot.reason and ro.boot.bootreason (write if empty)
set_prop(bootstat, bootloader_boot_reason_prop)
set_prop(bootstat, system_boot_reason_prop)
set_prop(bootstat, last_boot_reason_prop)
neverallow {
domain
-bootanim
-bootstat
-dumpstate
userdebug_or_eng(`-incidentd')
-init
-recovery
-shell
-system_server
} { bootloader_boot_reason_prop last_boot_reason_prop }:file r_file_perms;
# ... and refine, as these components should not set the last boot reason
neverallow { bootanim recovery } last_boot_reason_prop:file r_file_perms;
neverallow {
domain
-bootstat
-init
-system_server
} { bootloader_boot_reason_prop last_boot_reason_prop }:property_service set;
# ... and refine ... for a ro propertly no less ... keep this _tight_
neverallow system_server bootloader_boot_reason_prop:property_service set;