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
system_file_type is a new attribute used to identify files which exist
on the /system partition. It's useful for allow rules in init, which are
based off of a blacklist of writable files. Additionally, it's useful
for constructing neverallow rules to prevent regressions.
Additionally, add commented out tests which enforce that all files on
the /system partition have the system_file_type attribute. These tests
will be uncommented in a future change after all the device-specific
policies are cleaned up.
Test: Device boots and no obvious problems.
Change-Id: Id9bae6625f042594c8eba74ca712abb09702c1e5
Init is no longer calling vdc with logwrapper, so it must take care of
logging to kmsg directly.
Change-Id: I529f5a95e19c08ef75e0da9a02bae1cb7187eec0
avc: denied { write } for pid=367 comm="vdc" name="kmsg" dev="tmpfs" ino=11056 scontext=u:r:vdc:s0 tcontext=u:object_r:kmsg_device:s0 tclass=chr_file permissive=0
Test: observe vdc logging in kmsg on boot and stderr on normal usage
Change-Id: Ie3678509d360f19b95cb03aeea75f29843728203
Divide policy into public and private components. This is the first
step in splitting the policy creation for platform and non-platform
policies. The policy in the public directory will be exported for use
in non-platform policy creation. Backwards compatibility with it will
be achieved by converting the exported policy into attribute-based
policy when included as part of the non-platform policy and a mapping
file will be maintained to be included with the platform policy that
maps exported attributes of previous versions to the current platform
version.
Eventually we would like to create a clear interface between the
platform and non-platform device components so that the exported policy,
and the need for attributes is minimal. For now, almost all types and
avrules are left in public.
Test: Tested by building policy and running on device.
Change-Id: Idef796c9ec169259787c3f9d8f423edf4ce27f8c
