5d89abde99
These denials occur on boot when android_get_control_file also
changes from readlink() to realpath(), because realpath() will
lstat() the given path.
Some other domains (fastbootd, update_engine, etc.) also uses
libcutils to write to kernel log, where android_get_control_file()
is invoked, hence getattr is added to them as well.
04-28 06:15:22.290 618 618 I auditd : type=1400 audit(0.0:4): avc: denied { getattr } for comm="logd" path="/dev/kmsg" dev="tmpfs" ino=20917 scontext=u:r:logd:s0 tcontext=u:object_r:kmsg_device:s0 tclass=chr_file permissive=0
03-20 19:52:23.431 900 900 I auditd : type=1400 audit(0.0:7): avc: denied { getattr } for comm="android.hardwar" path="/dev/kmsg" dev="tmpfs" ino=20917 scontext=u:r:hal_health_default:s0 tcontext=u:object_r:kmsg_device:s0 tclass=chr_file permissive=0
...
03-20 22:40:42.316 1 1 W init : type=1400 audit(0.0:33): avc: denied { getattr } for path="/dev/kmsg" dev="tmpfs" ino=21999 scontext=u:r:init:s0 tcontext=u:object_r:kmsg_device:s0 tclass=chr_file permissive=0
Test: no denials related to these
Change-Id: I5263dd6b64c06fb092f3461858f57a1a09107429
57 lines
2.2 KiB
Plaintext
57 lines
2.2 KiB
Plaintext
# Domain for update_engine daemon.
|
|
type update_engine, domain, update_engine_common;
|
|
type update_engine_exec, system_file_type, exec_type, file_type;
|
|
|
|
net_domain(update_engine);
|
|
|
|
# Following permissions are needed for update_engine.
|
|
allow update_engine self:process { setsched };
|
|
allow update_engine self:global_capability_class_set { fowner sys_admin };
|
|
# Note: fsetid checks are triggered when creating a file in a directory with
|
|
# the setgid bit set to determine if the file should inherit setgid. In this
|
|
# case, setgid on the file is undesirable so we should just suppress the
|
|
# denial.
|
|
dontaudit update_engine self:global_capability_class_set fsetid;
|
|
|
|
allow update_engine kmsg_device:chr_file { getattr w_file_perms };
|
|
allow update_engine update_engine_exec:file rx_file_perms;
|
|
wakelock_use(update_engine);
|
|
|
|
# Ignore these denials.
|
|
dontaudit update_engine kernel:process setsched;
|
|
dontaudit update_engine self:global_capability_class_set sys_rawio;
|
|
|
|
# Allow using persistent storage in /data/misc/update_engine.
|
|
allow update_engine update_engine_data_file:dir create_dir_perms;
|
|
allow update_engine update_engine_data_file:file create_file_perms;
|
|
|
|
# Allow using persistent storage in /data/misc/update_engine_log.
|
|
allow update_engine update_engine_log_data_file:dir create_dir_perms;
|
|
allow update_engine update_engine_log_data_file:file create_file_perms;
|
|
|
|
# Don't allow kernel module loading, just silence the logs.
|
|
dontaudit update_engine kernel:system module_request;
|
|
|
|
# Register the service to perform Binder IPC.
|
|
binder_use(update_engine)
|
|
add_service(update_engine, update_engine_service)
|
|
|
|
# Allow update_engine to call the callback function provided by priv_app.
|
|
binder_call(update_engine, priv_app)
|
|
|
|
# Allow update_engine to call the callback function provided by system_server.
|
|
binder_call(update_engine, system_server)
|
|
|
|
# Read OTA zip file at /data/ota_package/.
|
|
allow update_engine ota_package_file:file r_file_perms;
|
|
allow update_engine ota_package_file:dir r_dir_perms;
|
|
|
|
# Use Boot Control HAL
|
|
hal_client_domain(update_engine, hal_bootctl)
|
|
|
|
# access /proc/misc
|
|
allow update_engine proc_misc:file r_file_perms;
|
|
|
|
# read directories on /system and /vendor
|
|
allow update_engine system_file:dir r_dir_perms;
|