5e37271df8
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
42 lines
1.5 KiB
Plaintext
42 lines
1.5 KiB
Plaintext
# mediametrics - daemon for collecting media.metrics data
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type mediametrics, domain;
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type mediametrics_exec, system_file_type, exec_type, file_type;
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binder_use(mediametrics)
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binder_call(mediametrics, binderservicedomain)
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binder_service(mediametrics)
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add_service(mediametrics, mediametrics_service)
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allow mediametrics system_server:fd use;
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r_dir_file(mediametrics, cgroup)
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allow mediametrics proc_meminfo:file r_file_perms;
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# allows interactions with dumpsys to GMScore
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allow mediametrics { app_data_file privapp_data_file }:file write;
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# allow access to package manager for uid->apk mapping
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allow mediametrics package_native_service:service_manager find;
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###
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### neverallow rules
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###
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# mediametrics should never execute any executable without a
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# domain transition
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neverallow mediametrics { 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 mediametrics domain:{ tcp_socket udp_socket rawip_socket } *;
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