Together with aosp/1282157 this change allows the service to
create trace files in the /data/misc/perfetto-traces folder.
Before this change they needed to be created by the perfetto
cmdline client and pass the FD.
This doesn't work for host tools like Android GPU Inspector
(https://gpuinspector.dev/) which talk to the UNIX socket
over adb forward and cannot pass a FD from the host.
Bug: 153519149
Test: manual: adb shell perfetto --txt -c -
buffers { size_kb: 65536 }
data_sources {
config {
name: "linux.ftrace"
ftrace_config { ftrace_events: "sched_switch" }
}
}
duration_ms: 5000
write_into_file: true
output_path: "/data/misc/perfetto-traces/ttt"
Change-Id: I184329805741654983843e6a29c1fac19a836f59
This concerns the data transfer between an untrusted producer process,
and the tracing service (traced daemon). They communicate over a
combination of a unix socket and shared memory.
Normally, the service creates the shared memory region, and hands it off
to the producer process (see perfetto_producer() macro). This patch
allows for an alternative scheme, where the producer process is allowed
to create the shared memory region, which will then be adopted by the
tracing service. The service already inherently doesn't trust the
producer, so it'll validate that the shared memory is appropriately
sealed before using it.
The immediate use-case is chrome's go/perfetto-startup-tracing-v2. But
this mode has advantages (e.g. being able to write to the shared memory
before connecting) for other producer domains as well.
Bug: 148841422
Change-Id: I90f864b900958792553f0208f4a0041dbf2892cc
Give /data itself a different label to its contents, to ensure that
only init creates files and directories there.
This change originally landed as aosp/1106014 and was reverted in
aosp/1116238 to fix b/140402208. aosp/1116298 fixes the underlying
problem, and with that we can re-land this change.
Bug: 139190159
Bug: 140402208
Test: aosp boots, logs look good
Change-Id: I1a366c577a0fff307ca366a6844231bcf8afe3bf
Give /data itself a different label to its contents, to ensure that
only init creates files and directories there.
Bug: 139190159
Test: aosp boots, logs look good
Change-Id: I3ee654a928bdab3f5d435ab6ac24040d9bdd9abe
Bug: http://b/135139675
Coverage files are written to /data/misc/trace (governed by the
method_trace_data_file selinux type). Allow all domains to access
(create directories, access files) this directory when native coverage
is enabled (by setting NATIVE_COVERAGE to true) in an userdebug or eng
build.
Also relax neverallow constraints to allow access to
method_trace_data_file for native coverage builds.
Test: Build 32-bit cuttlefish with coverage:
m NATIVE_COVERAGE=true COVERAGE_PATHS="*"
and verify that there are no selinux denials in kernel log and
logcat.
Change-Id: I3fe7c77612854b9de7de7a0ddd5cbf44a2f5c21e
This CL introduces allows traced to set the
sys.traceur.trace_end_signal property at the end
of the tracer. In turn that property notifies the
the Traceur app.
This is to allowing Traceur to be killed during
a long-trace and avoid wasting resources making
it a persistent service.
See aosp/886616 for the matching traceur change.
Test: manual
Bug: 116754732
Change-Id: I89e2f02b3f973813ce8ff3507d397a06502f84c1
The test was failing because of a selinux denial.
This adds the required rule.
Test: atest (previously failing CTS test passed)
Change-Id: Ieb99f9ab4c6014a3d0aa1fe6c6fb6b82fa9b7631
This is being done in preparation for the migration from ashmem to
memfd. In order for tmpfs objects to be usable across the Treble
boundary, they need to be declared in public policy whereas, they're
currently all declared in private policy as part of the
tmpfs_domain() macro. Remove the type declaration from the
macro, and remove tmpfs_domain() from the init_daemon_domain() macro
to avoid having to declare the *_tmpfs types for all init launched
domains. tmpfs is mostly used by apps and the media frameworks.
Bug: 122854450
Test: Boot Taimen and blueline. Watch videos, make phone calls, browse
internet, send text, install angry birds...play angry birds, keep
playing angry birds...
Change-Id: I20a47d2bb22e61b16187015c7bc7ca10accf6358
Merged-In: I20a47d2bb22e61b16187015c7bc7ca10accf6358
(cherry picked from commit e16fb9109c)
This requires moving the type declaration of
perfetto traced to public, because iorapd
needs to refer to it.
Denials without this CL:
https://pastebin.com/raw/sxHMeLEU
Bug: 72170747
Test: 1. runcon u:r:iorapd:s0 iorap.cmd.perfetto \
-v --output-proto /data/misc/iorapd/test
2. Check that no selinux denials other than
avc: denied { entrypoint } for path="/system/bin/iorap.cmd.perfetto" dev="sda6" ino=21 scontext=u:r:iorapd:s0 tcontext=u:object_r:system_file:s0 tclass=file permissive=1
show up (this is a side-effect of runcon).
Change-Id: Iacd1ab201fe9fb2a6302dbd528f42f709cbca054
This appears to be the minimum change required to accommodate Traceur
running the detachable Perfetto process.
Bug: 116754732
Test: Started a perfetto trace using --detach and it started
successfully.
Change-Id: I12881ae343389abdcc74af5f11ecbac99b03ef7c
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
This allows an optimization that consists in the "perfetto" cmdline
client passing directly the file descriptor for the output trace
to traced (as opposite to having traced streaming back the trace
data to "perfetto" and having that one doing the write() into file).
This reduces sensibly the memory traffic and CPU overhead of traces
with a minor change.
Bug: 73625179
Test: builds + perfetto_integrationtests w/ long_trace.cfg
Change-Id: I81f5a230338ced20dc543fd91c5a0bd0e58725f2
The previous selinux rules obtained via audit2allow didn't really
work with the case of apps connecting to the producer socket,
despite all the allow rules being correctly in place.
This was failing our CTS tests.
The reason for the failure (see denials pasted below) is due to
Multi Level Security (for multi-user), which was still preventing
apps form a different level to connect to the traced producer
socket and write to the shmem buffers they get passed back.
This CL tags the objects being accessed as mlstrusted.
CTS tests pass with this CL.
Denials:
avc: denied { write } for pid=8545 comm="traced_probes" name="traced_producer" dev="tmpfs" ino=23629 scontext=u:r:untrusted_app_25:s0:c512,c768 tcontext=u:object_r:traced_producer_socket:s0 tclass=sock_file permissive=1
avc: denied { write } for pid=8545 comm="traced_probes" name="traced_producer" dev="tmpfs" ino=23629 scontext=u:r:untrusted_app_25:s0:c512,c768 tcontext=u:object_r:traced_producer_socket:s0 tclass=sock_file permissive=1
avc: denied { connectto } for pid=8545 comm="traced_probes" path="/dev/socket/traced_producer" scontext=u:r:untrusted_app_25:s0:c512,c768 tcontext=u:r:traced:s0 tclass=unix_stream_socket permissive=1
avc: denied { connectto } for pid=8545 comm="traced_probes" path="/dev/socket/traced_producer" scontext=u:r:untrusted_app_25:s0:c512,c768 tcontext=u:r:traced:s0 tclass=unix_stream_socket permissive=1
avc: denied { write } for pid=8545 comm="traced_probes" path=2F6D656D66643A706572666574746F5F73686D656D202864656C6574656429 dev="tmpfs" ino=104483 scontext=u:r:untrusted_app_25:s0:c512,c768 tcontext=u:object_r:traced_tmpfs:s0 tclass=file permissive=1
Change-Id: I1598bc0b07bf39b8d0420b66caf06a4ca884f383
Bug: 73340039
Test: CtsPerfettoTestCases
Restrictions introduced in vendor init mean that new devices
may not no longer exempt vendor init from writing to system_data_file.
This means we must introduce a new label for /data/vendor which
vendor_init may write to.
Bug: 73087047
Test: build and boot Taimen and Marlin. Complete SUW, enroll fingerprint
No new denials.
Change-Id: I65f904bb28952d4776aab947515947e14befbe34
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
