1236e326a0
The profilers cannot open files under
/data/misc/apexdata/com.android.art/dalvik-cache because they're not
allowed to search /data/misc/apexdata with the apex_module_data_file
label.
Example denial:
avc: denied { search } for name="apexdata" dev="dm-37" ino=89
scontext=u:r:traced_perf:s0
tcontext=u:object_r:apex_module_data_file:s0 tclass=dir permissive=0
(cherry-picked from aosp + updated prebuilts)
Tested: patched & flashed onto a TM device, then profiled system_server
Bug: 241544593
Merged-In: Ifd8b94a9ebcae09701e95f6cd6a14383209963db
Change-Id: Ifd8b94a9ebcae09701e95f6cd6a14383209963db
(cherry picked from commit 3f3e222527)
74 lines
2.9 KiB
Text
74 lines
2.9 KiB
Text
# Performance profiler, backed by perf_event_open(2).
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# See go/perfetto-perf-android.
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typeattribute traced_perf coredomain;
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typeattribute traced_perf mlstrustedsubject;
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type traced_perf_exec, system_file_type, exec_type, file_type;
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init_daemon_domain(traced_perf)
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perfetto_producer(traced_perf)
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# Allow traced_perf full use of perf_event_open(2). It will perform cpu-wide
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# profiling, but retain samples only for profileable processes.
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# Thread-specific profiling is still disallowed due to a PTRACE_MODE_ATTACH
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# check (which would require a process:attach SELinux allow-rule).
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allow traced_perf self:perf_event { open cpu kernel read write tracepoint };
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# Allow CAP_KILL for delivery of dedicated signal to obtain proc-fds from a
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# process. Allow CAP_DAC_READ_SEARCH for stack unwinding and symbolization of
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# sampled stacks, which requires opening the backing libraries/executables (as
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# symbols are usually not mapped into the process space). Not all such files
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# are world-readable, e.g. odex files that included user profiles during
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# profile-guided optimization.
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allow traced_perf self:capability { kill dac_read_search };
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# Allow reading /system/data/packages.list.
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allow traced_perf packages_list_file:file r_file_perms;
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# Allow reading files for stack unwinding and symbolization.
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r_dir_file(traced_perf, nativetest_data_file)
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r_dir_file(traced_perf, system_file_type)
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r_dir_file(traced_perf, apk_data_file)
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r_dir_file(traced_perf, dalvikcache_data_file)
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r_dir_file(traced_perf, vendor_file_type)
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# ART apex files and directory access to the containing /data/misc/apexdata.
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r_dir_file(traced_perf, apex_art_data_file)
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allow traced_perf apex_module_data_file:dir { getattr search };
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# Allow to temporarily lift the kptr_restrict setting and build a symbolization
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# map reading /proc/kallsyms.
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userdebug_or_eng(`set_prop(traced_perf, lower_kptr_restrict_prop)')
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allow traced_perf proc_kallsyms:file r_file_perms;
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# Allow reading tracefs files to get the format and numeric ids of tracepoints.
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allow traced_perf debugfs_tracing:dir r_dir_perms;
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allow traced_perf debugfs_tracing:file r_file_perms;
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userdebug_or_eng(`
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allow traced_perf debugfs_tracing_debug:dir r_dir_perms;
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allow traced_perf debugfs_tracing_debug:file r_file_perms;
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')
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# Do not audit the cases where traced_perf attempts to access /proc/[pid] for
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# domains that it cannot read.
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dontaudit traced_perf domain:dir { search getattr open };
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# Do not audit failures to signal a process, as there are cases when this is
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# expected (native processes on debug builds use the policy for enforcing which
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# processes are profileable).
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dontaudit traced_perf domain:process signal;
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# Never allow access to app data files
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neverallow traced_perf { app_data_file privapp_data_file system_app_data_file }:file *;
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# Never allow profiling highly privileged processes.
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never_profile_perf(`{
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bpfloader
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init
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kernel
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keystore
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llkd
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logd
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ueventd
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vendor_init
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vold
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}')
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