c80f9e037b
Perfetto is a performance instrumentation and logging framework,
living in AOSP's /external/pefetto.
Perfetto introduces in the system one binary and two daemons
(the binary can specialize in either depending on the cmdline).
1) traced: unprivileged daemon. This is architecturally similar to logd.
It exposes two UNIX sockets:
- /dev/socket/traced_producer : world-accessible, allows to stream
tracing data. A tmpfs file descriptor is sent via SCM_RIGHTS
from traced to each client process, which needs to be able to
mmap it R/W (but not X)
- /dev/socket/traced_consumer : privilege-accessible (only from:
shell, statsd). It allows to configure tracing and read the trace
buffer.
2) traced_probes: privileged daemon. This needs to:
- access tracingfs (/d/tracing) to turn tracing on and off.
- exec atrace
- connect to traced_producer to stream data to traced.
init.rc file:
https://android-review.googlesource.com/c/platform/external/perfetto/+/575382/14/perfetto.rc
Bug: 70942310
Change-Id: Ia3b5fdacbd5a8e6e23b82f1d6fabfa07e4abc405
55 lines
2 KiB
Text
55 lines
2 KiB
Text
# Perfetto tracing probes, has tracefs access.
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type traced_probes, domain, coredomain;
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type traced_probes_exec, exec_type, file_type;
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# Allow init to exec the daemon.
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init_daemon_domain(traced_probes)
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# Write trace data to the Perfetto traced damon. This requires connecting to its
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# producer socket and obtaining a (per-process) tmpfs fd.
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allow traced_probes traced:fd use;
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allow traced_probes traced_tmpfs:file { read write getattr map };
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unix_socket_connect(traced_probes, traced_producer, traced)
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# Allow traced_probes to access tracefs.
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# TODO(primiano): For the moment this is userdebug/eng only until we get an
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# approval for user builds.
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userdebug_or_eng(`
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allow traced_probes debugfs_tracing:dir r_dir_perms;
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allow traced_probes debugfs_tracing:file rw_file_perms;
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allow traced_probes debugfs_tracing_debug:file rw_file_perms;
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allow traced_probes debugfs_trace_marker:file getattr;
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')
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# Allow traced_probes to start with a higher scheduling class and then downgrade
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# itself.
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allow traced_probes self:global_capability_class_set { sys_nice };
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# Allow procfs access
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r_dir_file(traced_probes, domain)
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###
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### Neverallow rules
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###
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### traced_probes should NEVER do any of this
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# Disallow mapping executable memory (execstack and exec are already disallowed
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# globally in domain.te).
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neverallow traced_probes self:process execmem;
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# Block device access.
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neverallow traced_probes dev_type:blk_file { read write };
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# ptrace any other app
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neverallow traced_probes domain:process ptrace;
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# Disallows access to /data files.
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neverallow traced { data_file_type -system_data_file -zoneinfo_data_file }:dir *;
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neverallow traced system_data_file:dir ~{ getattr search };
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neverallow traced zoneinfo_data_file:dir ~r_dir_perms;
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neverallow traced { data_file_type -zoneinfo_data_file }:lnk_file *;
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neverallow traced { data_file_type -zoneinfo_data_file }:file *;
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# Only init is allowed to enter the traced_probes domain via exec()
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neverallow { domain -init } traced_probes:process transition;
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neverallow * traced_probes:process dyntransition;
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