android_system_sepolicy/public/hal_omx.te
Pawin Vongmasa 76d7cf961e Allow XML file paths to be customized with sysprop
Three properties are declared as vendor-init-settable:
ro.media.xml_variant.codecs
ro.media.xml_variant.codecs_performance
ro.media.xml_variant.profiles

media_codecs.xml can now be named
media_codecs${ro.media.xml_variant.codecs}.xml

media_codecs_performance.xml can now be named
media_codecs_performance${ro.media.xml_variant.codecs_performance}.xml

media_profiles_V1_0 can now be named
media_profiles${ro.media.xml_variant.profiles}.xml

Test: Rename "media_codecs.xml" to "media_codecs_test.xml",
set ro.media.xml_variant.codecs to "_test", then
call "stagefright -i".

Test: Rename "media_codecs_performance.xml" to
"media_codecs_performance_test.xml",
set ro.media.xml_variant.codecs_performance to "_test", then
run android.media.cts.VideoDecoderPerfTest.

Test: Rename "media_profiles_V1_0.xml" to "media_profiles_test.xml",
set ro.media.xml_variant.profiles to "_test", then
run vts_mediaProfiles_validate_test.

Bug: 142102953
Change-Id: I407a0a327fcc8e799bb4079b11048a497565be48
2020-03-18 06:02:55 -07:00

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# applies all permissions to hal_omx NOT hal_omx_server
# since OMX must always be in its own process.
binder_call(hal_omx_server, binderservicedomain)
binder_call(hal_omx_server, { appdomain -isolated_app })
# Allow hal_omx_server access to composer sync fences
allow hal_omx_server hal_graphics_composer:fd use;
allow hal_omx_server ion_device:chr_file rw_file_perms;
allow hal_omx_server hal_camera:fd use;
crash_dump_fallback(hal_omx_server)
# Recieve gralloc buffer FDs from bufferhubd. Note that hal_omx_server never
# directly connects to bufferhubd via PDX. Instead, a VR app acts as a bridge
# between those two: it talks to hal_omx_server via Binder and talks to bufferhubd
# via PDX. Thus, there is no need to use pdx_client macro.
allow hal_omx_server bufferhubd:fd use;
hal_attribute_hwservice(hal_omx, hal_omx_hwservice)
allow hal_omx_client hidl_token_hwservice:hwservice_manager find;
get_prop(hal_omx_client, media_variant_prop)
get_prop(hal_omx_server, media_variant_prop)
binder_call(hal_omx_client, hal_omx_server)
binder_call(hal_omx_server, hal_omx_client)
###
### neverallow rules
###
# hal_omx_server should never execute any executable without a
# domain transition
neverallow hal_omx_server { file_type fs_type }:file execute_no_trans;
# The goal of the mediaserver split is to place media processing code into
# restrictive sandboxes with limited responsibilities and thus limited
# permissions. Example: Audioserver is only responsible for controlling audio
# hardware and processing audio content. Cameraserver does the same for camera
# hardware/content. Etc.
#
# Media processing code is inherently risky and thus should have limited
# permissions and be isolated from the rest of the system and network.
# Lengthier explanation here:
# https://android-developers.googleblog.com/2016/05/hardening-media-stack.html
neverallow hal_omx_server domain:{ tcp_socket udp_socket rawip_socket } *;