2016-10-12 23:58:09 +02:00
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# systrace support - allow atrace to run
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allow shell debugfs_tracing:dir r_dir_perms;
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tracefs: avoid overly generic regexes
On boot, Android runs restorecon on a number of virtual directories,
such as /sys and /sys/kernel/debug, to ensure that the SELinux labels
are correct. To avoid causing excessive boot time delays, the restorecon
code aggressively prunes directories, to avoid recursing down directory
trees which will never have a matching SELinux label.
See:
* https://android-review.googlesource.com/93401
* https://android-review.googlesource.com/109103
The key to this optimization is avoiding unnecessarily broad regular
expressions in file_contexts. If an overly broad regex exists, the tree
pruning code is ineffective, and the restorecon ends up visiting lots of
unnecessary directories.
The directory /sys/kernel/debug/tracing contains approximately 4500
files normally, and on debuggable builds, this number can jump to over
9000 files when the processing from wifi-events.rc occurs. For
comparison, the entire /sys/kernel/debug tree (excluding
/sys/kernel/debug/tracing) only contains approximately 8000 files. The
regular expression "/sys/kernel(/debug)?/tracing/(.*)?" ends up matching
a significant number of files, which impacts boot performance.
Instead of using an overly broad regex, refine the regex so only the
files needed have an entry in file_contexts. This list of files is
essentially a duplicate of the entries in
frameworks/native/cmds/atrace/atrace.rc .
This change reduces the restorecon_recursive call for /sys/kernel/debug
from approximately 260ms to 40ms, a boot time reduction of approximately
220ms.
Bug: 35248779
Test: device boots, no SELinux denials, faster boot.
Change-Id: I70f8af102762ec0180546b05fcf014c097135f3e
2017-02-12 07:01:58 +01:00
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allow shell debugfs_tracing:file r_file_perms;
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allow shell tracing_shell_writable:file rw_file_perms;
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2016-10-12 23:58:09 +02:00
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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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2016-12-08 20:23:34 +01:00
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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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