7218698d5a
when GMSCore collects information for uploading via 'dumpsys media.metrics', it provides the metrics service with a file descriptor to hold the data, which is post-processed by the log collecting code in GMScore. This temp file lives in /data/, a place where our restrictive policies for media.metrics doesn't allow any writing. This relaxes the restrictions -- allowing media.metrics to write to already open file descriptors it might be given on that partition. Bug: 36660639 Test: build/boot Change-Id: Icbaa76b04ecf731014b6b1bb1283bc2951a6ae4b
39 lines
1.3 KiB
Plaintext
39 lines
1.3 KiB
Plaintext
# mediametrics - daemon for collecting media.metrics data
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type mediametrics, domain;
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type mediametrics_exec, 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:file write;
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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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