ffa0dd93f3
This patch adds the necessary rules to support the existing usage of
perf_event_open by the system partition, which almost exclusively
concerns the simpleperf profiler. A new domain is introduced for some
(but not all) executions of the system image simpleperf. The following
configurations are supported:
* shell -> shell process (no domain transition)
* shell -> debuggable app (through shell -> runas -> runas_app)
* shell -> profileable app (through shell -> simpleperf_app_runner ->
untrusted_app -> simpleperf)
* debuggable/profile app -> self (through untrusted_app -> simpleperf)
simpleperf_app_runner still enters the untrusted_app domain immediately
before exec to properly inherit the categories related to MLS. My
understanding is that a direct transition would require modifying
external/selinux and seapp_contexts as with "fromRunAs", which seems
unnecessarily complex for this case.
runas_app can still run side-loaded binaries and use perf_event_open,
but it checks that the target app is exactly "debuggable"
(profileability is insufficient).
system-wide profiling is effectively constrained to "su" on debug
builds.
See go/perf-event-open-security for a more detailed explanation of the
scenarios covered here.
Tested: "atest CtsSimpleperfTestCases" on crosshatch-user/userdebug
Tested: manual simpleperf invocations on crosshatch-userdebug
Bug: 137092007
Change-Id: I2100929bae6d81f336f72eff4235fd5a78b94066
93 lines
2.9 KiB
Text
93 lines
2.9 KiB
Text
typeattribute shell coredomain;
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# allow shell input injection
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allow shell uhid_device:chr_file rw_file_perms;
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# systrace support - allow atrace to run
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allow shell debugfs_tracing_debug:dir r_dir_perms;
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allow shell debugfs_tracing:dir r_dir_perms;
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allow shell debugfs_tracing:file rw_file_perms;
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allow shell debugfs_trace_marker:file getattr;
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allow shell atrace_exec:file rx_file_perms;
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userdebug_or_eng(`
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allow shell debugfs_tracing_debug:file rw_file_perms;
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')
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# read config.gz for CTS purposes
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allow shell config_gz:file r_file_perms;
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# Run app_process.
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# XXX Transition into its own domain?
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app_domain(shell)
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# allow shell to call dumpsys storaged
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binder_call(shell, storaged)
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# Perform SELinux access checks, needed for CTS
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selinux_check_access(shell)
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selinux_check_context(shell)
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# Control Perfetto traced and obtain traces from it.
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# Needed for Studio and debugging.
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unix_socket_connect(shell, traced_consumer, traced)
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# Allow shell binaries to write trace data to Perfetto. Used for testing and
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# cmdline utils.
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perfetto_producer(shell)
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domain_auto_trans(shell, vendor_shell_exec, vendor_shell)
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# Allow shell binaries to exec the perfetto cmdline util and have that
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# transition into its own domain, so that it behaves consistently to
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# when exec()-d by statsd.
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domain_auto_trans(shell, perfetto_exec, perfetto)
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# Allow to send SIGINT to perfetto when daemonized.
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allow shell perfetto:process signal;
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# Allow shell to run adb shell cmd stats commands. Needed for CTS.
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binder_call(shell, statsd);
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# Allow shell to read and unlink traces stored in /data/misc/perfetto-traces.
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allow shell perfetto_traces_data_file:dir rw_dir_perms;
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allow shell perfetto_traces_data_file:file { r_file_perms unlink };
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# Allow shell to run adb shell cmd gpu commands.
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binder_call(shell, gpuservice);
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# Allow shell to use atrace HAL
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hal_client_domain(shell, hal_atrace)
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# For hostside tests such as CTS listening ports test.
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allow shell proc_net_tcp_udp:file r_file_perms;
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# The dl.exec_linker* tests need to execute /system/bin/linker
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# b/124789393
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allow shell system_linker_exec:file rx_file_perms;
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# Renderscript host side tests depend on being able to execute
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# /system/bin/bcc (b/126388046)
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allow shell rs_exec:file rx_file_perms;
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# Allow shell to start and comminicate with lpdumpd.
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set_prop(shell, lpdumpd_prop);
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binder_call(shell, lpdumpd)
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# Allow shell to set linker property
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userdebug_or_eng(`
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set_prop(shell, linker_prop)
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')
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# Allow shell to get encryption policy of /data/local/tmp/, for CTS
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allowxperm shell shell_data_file:dir ioctl {
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FS_IOC_GET_ENCRYPTION_POLICY
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FS_IOC_GET_ENCRYPTION_POLICY_EX
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};
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# Allow shell to execute simpleperf without a domain transition.
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allow shell simpleperf_exec:file rx_file_perms;
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# Allow shell to call perf_event_open for profiling other shell processes, but
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# not the whole system.
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allow shell self:perf_event { open read write kernel };
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neverallow shell self:perf_event ~{ open read write kernel };
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