41daa7f859
Specify per-service rules for PDX transport. Now being able to grant permissions to individual services provided by processes, not all services of a process. Also tighter control over which permissions are required for client and server for individual components of IPC (endpoints, channels, etc). Bug: 37646189 Change-Id: I78eb8ae8b6e08105666445a66bfcbd2f1d69d0ea
67 lines
2.5 KiB
Text
67 lines
2.5 KiB
Text
# mediacodec - audio and video codecs live here
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type mediacodec, domain;
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type mediacodec_exec, exec_type, vendor_file_type, file_type;
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typeattribute mediacodec mlstrustedsubject;
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# TODO(b/36375899) attributize this domain appropriately as hal_omx
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# and use macro hal_server_domain
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get_prop(mediacodec, hwservicemanager_prop)
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# can route /dev/binder traffic to /dev/vndbinder
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vndbinder_use(mediacodec)
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not_full_treble(`
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# on legacy devices, continue to allow /dev/binder traffic
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binder_use(mediacodec)
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binder_service(mediacodec)
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add_service(mediacodec, mediacodec_service)
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allow mediacodec mediametrics_service:service_manager find;
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allow mediacodec surfaceflinger_service:service_manager find;
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')
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binder_call(mediacodec, binderservicedomain)
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binder_call(mediacodec, appdomain)
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# Allow mediacodec access to composer sync fences
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allow mediacodec hal_graphics_composer:fd use;
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allow mediacodec gpu_device:chr_file rw_file_perms;
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allow mediacodec video_device:chr_file rw_file_perms;
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allow mediacodec video_device:dir search;
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allow mediacodec ion_device:chr_file rw_file_perms;
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allow mediacodec hal_camera:fd use;
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crash_dump_fallback(mediacodec)
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add_hwservice(mediacodec, hal_omx_hwservice)
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hal_client_domain(mediacodec, hal_allocator)
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# allocate and use graphic buffers
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hal_client_domain(mediacodec, hal_graphics_allocator)
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# Recieve gralloc buffer FDs from bufferhubd. Note that mediacodec never
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# directly connects to bufferhubd via PDX. Instead, a VR app acts as a bridge
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# between those two: it talks to mediacodec via Binder and talks to bufferhubd
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# via PDX. Thus, there is no need to use pdx_client macro.
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allow mediacodec bufferhubd:fd use;
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###
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### neverallow rules
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###
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# mediacodec should never execute any executable without a
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# domain transition
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neverallow mediacodec { file_type fs_type }:file execute_no_trans;
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# The goal of the mediaserver split is to place media processing code into
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# restrictive sandboxes with limited responsibilities and thus limited
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# permissions. Example: Audioserver is only responsible for controlling audio
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# hardware and processing audio content. Cameraserver does the same for camera
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# hardware/content. Etc.
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#
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# Media processing code is inherently risky and thus should have limited
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# permissions and be isolated from the rest of the system and network.
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# Lengthier explanation here:
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# https://android-developers.googleblog.com/2016/05/hardening-media-stack.html
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neverallow mediacodec domain:{ tcp_socket udp_socket rawip_socket } *;
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