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Commit 385f7ee9 authored by Carmen Jackson's avatar Carmen Jackson
Browse files

Update filesystem permissions in atrace.rc to give selinux control. 

These were previously restricted to shell user, but now that some apps
that require access, such as Traceur, are no longer running as the shell
user, these permissions must be loosened.

Selinux will now control access rights to these files completely, rather
than using a combination of unix permissions and selinux permissions.

- Removed chown sections because they're not necessary with chmod 666
- Included both debug and non-debug directory structures in
atrace_userdebug.rc

Bug: 68126425
Test: Traceur (outside of shell user) and command-line atrace both function.
Change-Id: Ie1ba4328a5cb3b9647acf9ef6e8aeeba61cb4961
parent 1aafb843

cmds/atrace/atrace.rc

+76 −131
Original line number Diff line number Diff line
@@ -6,141 +6,86 @@ on post-fs 
    chmod 0222 /sys/kernel/debug/tracing/trace_marker

    chmod 0222 /sys/kernel/tracing/trace_marker



# Allow the shell group to enable (some) kernel tracing.

    chown root shell /sys/kernel/debug/tracing/trace_clock

    chown root shell /sys/kernel/tracing/trace_clock

    chown root shell /sys/kernel/debug/tracing/buffer_size_kb

    chown root shell /sys/kernel/tracing/buffer_size_kb

    chown root shell /sys/kernel/debug/tracing/options/overwrite

    chown root shell /sys/kernel/tracing/options/overwrite

    chown root shell /sys/kernel/debug/tracing/options/print-tgid

    chown root shell /sys/kernel/tracing/options/print-tgid

    chown root shell /sys/kernel/debug/tracing/saved_cmdlines_size

    chown root shell /sys/kernel/tracing/saved_cmdlines_size

    chown root shell /sys/kernel/debug/tracing/events/sched/sched_switch/enable

    chown root shell /sys/kernel/tracing/events/sched/sched_switch/enable

    chown root shell /sys/kernel/debug/tracing/events/sched/sched_wakeup/enable

    chown root shell /sys/kernel/tracing/events/sched/sched_wakeup/enable

    chown root shell /sys/kernel/debug/tracing/events/sched/sched_blocked_reason/enable

    chown root shell /sys/kernel/tracing/events/sched/sched_blocked_reason/enable

    chown root shell /sys/kernel/debug/tracing/events/sched/sched_cpu_hotplug/enable

    chown root shell /sys/kernel/tracing/events/sched/sched_cpu_hotplug/enable

    chown root shell /sys/kernel/debug/tracing/events/cgroup/enable

    chown root shell /sys/kernel/tracing/events/cgroup/enable

    chown root shell /sys/kernel/debug/tracing/events/power/cpu_frequency/enable

    chown root shell /sys/kernel/tracing/events/power/cpu_frequency/enable

    chown root shell /sys/kernel/debug/tracing/events/power/cpu_idle/enable

    chown root shell /sys/kernel/tracing/events/power/cpu_idle/enable

    chown root shell /sys/kernel/debug/tracing/events/power/clock_set_rate/enable

    chown root shell /sys/kernel/tracing/events/power/clock_set_rate/enable

    chown root shell /sys/kernel/debug/tracing/events/power/cpu_frequency_limits/enable

    chown root shell /sys/kernel/tracing/events/power/cpu_frequency_limits/enable

    chown root shell /sys/kernel/debug/tracing/events/cpufreq_interactive/enable

    chown root shell /sys/kernel/tracing/events/cpufreq_interactive/enable

    chown root shell /sys/kernel/debug/tracing/events/vmscan/mm_vmscan_direct_reclaim_begin/enable

    chown root shell /sys/kernel/tracing/events/vmscan/mm_vmscan_direct_reclaim_begin/enable

    chown root shell /sys/kernel/debug/tracing/events/vmscan/mm_vmscan_direct_reclaim_end/enable

    chown root shell /sys/kernel/tracing/events/vmscan/mm_vmscan_direct_reclaim_end/enable

    chown root shell /sys/kernel/debug/tracing/events/vmscan/mm_vmscan_kswapd_wake/enable

    chown root shell /sys/kernel/tracing/events/vmscan/mm_vmscan_kswapd_wake/enable

    chown root shell /sys/kernel/debug/tracing/events/vmscan/mm_vmscan_kswapd_sleep/enable

    chown root shell /sys/kernel/tracing/events/vmscan/mm_vmscan_kswapd_sleep/enable

    chown root shell /sys/kernel/debug/tracing/events/binder/binder_transaction/enable

    chown root shell /sys/kernel/tracing/events/binder/binder_transaction/enable

    chown root shell /sys/kernel/debug/tracing/events/binder/binder_transaction_received/enable

    chown root shell /sys/kernel/tracing/events/binder/binder_transaction_received/enable

    chown root shell /sys/kernel/debug/tracing/events/binder/binder_lock/enable

    chown root shell /sys/kernel/tracing/events/binder/binder_lock/enable

    chown root shell /sys/kernel/debug/tracing/events/binder/binder_locked/enable

    chown root shell /sys/kernel/tracing/events/binder/binder_locked/enable

    chown root shell /sys/kernel/debug/tracing/events/binder/binder_unlock/enable

    chown root shell /sys/kernel/tracing/events/binder/binder_unlock/enable

    chown root shell /sys/kernel/debug/tracing/events/lowmemorykiller/enable

    chown root shell /sys/kernel/tracing/events/lowmemorykiller/enable



    chown root shell /sys/kernel/debug/tracing/tracing_on

    chown root shell /sys/kernel/tracing/tracing_on



    chmod 0664 /sys/kernel/debug/tracing/trace_clock

    chmod 0664 /sys/kernel/tracing/trace_clock

    chmod 0664 /sys/kernel/debug/tracing/buffer_size_kb

    chmod 0664 /sys/kernel/tracing/buffer_size_kb

    chmod 0664 /sys/kernel/debug/tracing/options/overwrite

    chmod 0664 /sys/kernel/tracing/options/overwrite

    chmod 0664 /sys/kernel/debug/tracing/options/print-tgid

    chmod 0664 /sys/kernel/tracing/options/print-tgid

    chmod 0664 /sys/kernel/debug/tracing/saved_cmdlines_size

    chmod 0664 /sys/kernel/tracing/saved_cmdlines_size

    chmod 0664 /sys/kernel/debug/tracing/events/sched/sched_switch/enable

    chmod 0664 /sys/kernel/tracing/events/sched/sched_switch/enable

    chmod 0664 /sys/kernel/debug/tracing/events/sched/sched_wakeup/enable

    chmod 0664 /sys/kernel/tracing/events/sched/sched_wakeup/enable

    chmod 0664 /sys/kernel/debug/tracing/events/sched/sched_blocked_reason/enable

    chmod 0664 /sys/kernel/tracing/events/sched/sched_blocked_reason/enable

    chmod 0664 /sys/kernel/debug/tracing/events/sched/sched_cpu_hotplug/enable

    chmod 0664 /sys/kernel/tracing/events/sched/sched_cpu_hotplug/enable

    chmod 0664 /sys/kernel/debug/tracing/events/cgroup/enable

    chmod 0664 /sys/kernel/tracing/events/cgroup/enable

    chmod 0664 /sys/kernel/debug/tracing/events/power/cpu_frequency/enable

    chmod 0664 /sys/kernel/tracing/events/power/cpu_frequency/enable

    chmod 0664 /sys/kernel/debug/tracing/events/power/cpu_idle/enable

    chmod 0664 /sys/kernel/tracing/events/power/cpu_idle/enable

    chmod 0664 /sys/kernel/debug/tracing/events/power/clock_set_rate/enable

    chmod 0664 /sys/kernel/tracing/events/power/clock_set_rate/enable

    chmod 0664 /sys/kernel/debug/tracing/events/power/cpu_frequency_limits/enable

    chmod 0664 /sys/kernel/tracing/events/power/cpu_frequency_limits/enable

    chmod 0664 /sys/kernel/debug/tracing/events/cpufreq_interactive/enable

    chmod 0664 /sys/kernel/tracing/events/cpufreq_interactive/enable

    chmod 0664 /sys/kernel/debug/tracing/events/vmscan/mm_vmscan_direct_reclaim_begin/enable

    chmod 0664 /sys/kernel/tracing/events/vmscan/mm_vmscan_direct_reclaim_begin/enable

    chmod 0664 /sys/kernel/debug/tracing/events/vmscan/mm_vmscan_direct_reclaim_end/enable

    chmod 0664 /sys/kernel/tracing/events/vmscan/mm_vmscan_direct_reclaim_end/enable

    chmod 0664 /sys/kernel/debug/tracing/events/vmscan/mm_vmscan_kswapd_wake/enable

    chmod 0664 /sys/kernel/tracing/events/vmscan/mm_vmscan_kswapd_wake/enable

    chmod 0664 /sys/kernel/debug/tracing/events/vmscan/mm_vmscan_kswapd_sleep/enable

    chmod 0664 /sys/kernel/tracing/events/vmscan/mm_vmscan_kswapd_sleep/enable

    chmod 0664 /sys/kernel/debug/tracing/tracing_on

    chmod 0664 /sys/kernel/tracing/tracing_on

    chmod 0664 /sys/kernel/debug/tracing/events/binder/binder_transaction/enable

    chmod 0664 /sys/kernel/tracing/events/binder/binder_transaction/enable

    chmod 0664 /sys/kernel/debug/tracing/events/binder/binder_transaction_received/enable

    chmod 0664 /sys/kernel/tracing/events/binder/binder_transaction_received/enable

    chmod 0664 /sys/kernel/debug/tracing/events/binder/binder_lock/enable

    chmod 0664 /sys/kernel/tracing/events/binder/binder_lock/enable

    chmod 0664 /sys/kernel/debug/tracing/events/binder/binder_locked/enable

    chmod 0664 /sys/kernel/tracing/events/binder/binder_locked/enable

    chmod 0664 /sys/kernel/debug/tracing/events/binder/binder_unlock/enable

    chmod 0664 /sys/kernel/tracing/events/binder/binder_unlock/enable

    chmod 0664 /sys/kernel/debug/tracing/events/i2c/enable

    chmod 0664 /sys/kernel/tracing/events/i2c/enable

    chmod 0664 /sys/kernel/debug/tracing/events/i2c/i2c_read/enable

    chmod 0664 /sys/kernel/tracing/events/i2c/i2c_read/enable

    chmod 0664 /sys/kernel/debug/tracing/events/i2c/i2c_write/enable

    chmod 0664 /sys/kernel/tracing/events/i2c/i2c_write/enable

    chmod 0664 /sys/kernel/debug/tracing/events/i2c/i2c_result/enable

    chmod 0664 /sys/kernel/tracing/events/i2c/i2c_result/enable

    chmod 0664 /sys/kernel/debug/tracing/events/i2c/i2c_reply/enable

    chmod 0664 /sys/kernel/tracing/events/i2c/i2c_reply/enable

    chmod 0664 /sys/kernel/debug/tracing/events/i2c/smbus_read/enable

    chmod 0664 /sys/kernel/tracing/events/i2c/smbus_read/enable

    chmod 0664 /sys/kernel/debug/tracing/events/i2c/smbus_write/enable

    chmod 0664 /sys/kernel/tracing/events/i2c/smbus_write/enable

    chmod 0664 /sys/kernel/debug/tracing/events/i2c/smbus_result/enable

    chmod 0664 /sys/kernel/tracing/events/i2c/smbus_result/enable

    chmod 0664 /sys/kernel/debug/tracing/events/i2c/smbus_reply/enable

    chmod 0664 /sys/kernel/tracing/events/i2c/smbus_reply/enable

    chmod 0664 /sys/kernel/debug/tracing/events/lowmemorykiller/enable

    chmod 0664 /sys/kernel/tracing/events/lowmemorykiller/enable

# Grant unix world read/write permissions to kernel tracepoints.

# Access control to these files is now entirely in selinux policy.

    chmod 0666 /sys/kernel/debug/tracing/trace_clock

    chmod 0666 /sys/kernel/tracing/trace_clock

    chmod 0666 /sys/kernel/debug/tracing/buffer_size_kb

    chmod 0666 /sys/kernel/tracing/buffer_size_kb

    chmod 0666 /sys/kernel/debug/tracing/options/overwrite

    chmod 0666 /sys/kernel/tracing/options/overwrite

    chmod 0666 /sys/kernel/debug/tracing/options/print-tgid

    chmod 0666 /sys/kernel/tracing/options/print-tgid

    chmod 0666 /sys/kernel/debug/tracing/saved_cmdlines_size

    chmod 0666 /sys/kernel/tracing/saved_cmdlines_size

    chmod 0666 /sys/kernel/debug/tracing/events/sched/sched_switch/enable

    chmod 0666 /sys/kernel/tracing/events/sched/sched_switch/enable

    chmod 0666 /sys/kernel/debug/tracing/events/sched/sched_wakeup/enable

    chmod 0666 /sys/kernel/tracing/events/sched/sched_wakeup/enable

    chmod 0666 /sys/kernel/debug/tracing/events/sched/sched_blocked_reason/enable

    chmod 0666 /sys/kernel/tracing/events/sched/sched_blocked_reason/enable

    chmod 0666 /sys/kernel/debug/tracing/events/sched/sched_cpu_hotplug/enable

    chmod 0666 /sys/kernel/tracing/events/sched/sched_cpu_hotplug/enable

    chmod 0666 /sys/kernel/debug/tracing/events/cgroup/enable

    chmod 0666 /sys/kernel/tracing/events/cgroup/enable

    chmod 0666 /sys/kernel/debug/tracing/events/power/cpu_frequency/enable

    chmod 0666 /sys/kernel/tracing/events/power/cpu_frequency/enable

    chmod 0666 /sys/kernel/debug/tracing/events/power/cpu_idle/enable

    chmod 0666 /sys/kernel/tracing/events/power/cpu_idle/enable

    chmod 0666 /sys/kernel/debug/tracing/events/power/clock_set_rate/enable

    chmod 0666 /sys/kernel/tracing/events/power/clock_set_rate/enable

    chmod 0666 /sys/kernel/debug/tracing/events/power/cpu_frequency_limits/enable

    chmod 0666 /sys/kernel/tracing/events/power/cpu_frequency_limits/enable

    chmod 0666 /sys/kernel/debug/tracing/events/cpufreq_interactive/enable

    chmod 0666 /sys/kernel/tracing/events/cpufreq_interactive/enable

    chmod 0666 /sys/kernel/debug/tracing/events/vmscan/mm_vmscan_direct_reclaim_begin/enable

    chmod 0666 /sys/kernel/tracing/events/vmscan/mm_vmscan_direct_reclaim_begin/enable

    chmod 0666 /sys/kernel/debug/tracing/events/vmscan/mm_vmscan_direct_reclaim_end/enable

    chmod 0666 /sys/kernel/tracing/events/vmscan/mm_vmscan_direct_reclaim_end/enable

    chmod 0666 /sys/kernel/debug/tracing/events/vmscan/mm_vmscan_kswapd_wake/enable

    chmod 0666 /sys/kernel/tracing/events/vmscan/mm_vmscan_kswapd_wake/enable

    chmod 0666 /sys/kernel/debug/tracing/events/vmscan/mm_vmscan_kswapd_sleep/enable

    chmod 0666 /sys/kernel/tracing/events/vmscan/mm_vmscan_kswapd_sleep/enable

    chmod 0666 /sys/kernel/debug/tracing/tracing_on

    chmod 0666 /sys/kernel/tracing/tracing_on

    chmod 0666 /sys/kernel/debug/tracing/events/binder/binder_transaction/enable

    chmod 0666 /sys/kernel/tracing/events/binder/binder_transaction/enable

    chmod 0666 /sys/kernel/debug/tracing/events/binder/binder_transaction_received/enable

    chmod 0666 /sys/kernel/tracing/events/binder/binder_transaction_received/enable

    chmod 0666 /sys/kernel/debug/tracing/events/binder/binder_lock/enable

    chmod 0666 /sys/kernel/tracing/events/binder/binder_lock/enable

    chmod 0666 /sys/kernel/debug/tracing/events/binder/binder_locked/enable

    chmod 0666 /sys/kernel/tracing/events/binder/binder_locked/enable

    chmod 0666 /sys/kernel/debug/tracing/events/binder/binder_unlock/enable

    chmod 0666 /sys/kernel/tracing/events/binder/binder_unlock/enable

    chmod 0666 /sys/kernel/debug/tracing/events/i2c/enable

    chmod 0666 /sys/kernel/tracing/events/i2c/enable

    chmod 0666 /sys/kernel/debug/tracing/events/i2c/i2c_read/enable

    chmod 0666 /sys/kernel/tracing/events/i2c/i2c_read/enable

    chmod 0666 /sys/kernel/debug/tracing/events/i2c/i2c_write/enable

    chmod 0666 /sys/kernel/tracing/events/i2c/i2c_write/enable

    chmod 0666 /sys/kernel/debug/tracing/events/i2c/i2c_result/enable

    chmod 0666 /sys/kernel/tracing/events/i2c/i2c_result/enable

    chmod 0666 /sys/kernel/debug/tracing/events/i2c/i2c_reply/enable

    chmod 0666 /sys/kernel/tracing/events/i2c/i2c_reply/enable

    chmod 0666 /sys/kernel/debug/tracing/events/i2c/smbus_read/enable

    chmod 0666 /sys/kernel/tracing/events/i2c/smbus_read/enable

    chmod 0666 /sys/kernel/debug/tracing/events/i2c/smbus_write/enable

    chmod 0666 /sys/kernel/tracing/events/i2c/smbus_write/enable

    chmod 0666 /sys/kernel/debug/tracing/events/i2c/smbus_result/enable

    chmod 0666 /sys/kernel/tracing/events/i2c/smbus_result/enable

    chmod 0666 /sys/kernel/debug/tracing/events/i2c/smbus_reply/enable

    chmod 0666 /sys/kernel/tracing/events/i2c/smbus_reply/enable

    chmod 0666 /sys/kernel/debug/tracing/events/lowmemorykiller/enable

    chmod 0666 /sys/kernel/tracing/events/lowmemorykiller/enable



# Tracing disabled by default

    write /sys/kernel/debug/tracing/tracing_on 0

    write /sys/kernel/tracing/tracing_on 0



# Allow only the shell group to read and truncate the kernel trace.

    chown root shell /sys/kernel/debug/tracing/trace

    chown root shell /sys/kernel/tracing/trace

    chmod 0660 /sys/kernel/debug/tracing/trace

    chmod 0660 /sys/kernel/tracing/trace

# Read and truncate the kernel trace.

    chmod 0666 /sys/kernel/debug/tracing/trace

    chmod 0666 /sys/kernel/tracing/trace



on property:persist.debug.atrace.boottrace=1

    start boottrace

cmds/atrace/atrace_userdebug.rc

+34 −38
Original line number Diff line number Diff line 
## Permissions to allow additional system-wide tracing to the kernel trace buffer.

## The default list of permissions is set in frameworks/native/cmds/atrace/atrace.rc



# Allow the shell group to enable kernel tracepoints:

# Grant unix world read/write permissions to enable kernel tracepoints.

# Access control to these files is now entirely in selinux policy.



on post-fs

    chown root shell /sys/kernel/debug/tracing/events/sync/enable

    chown root shell /sys/kernel/debug/tracing/events/workqueue/enable

    chown root shell /sys/kernel/debug/tracing/events/regulator/enable

    chown root shell /sys/kernel/debug/tracing/events/pagecache/enable

    chmod 0666 /sys/kernel/tracing/events/sync/enable

    chmod 0666 /sys/kernel/debug/tracing/events/sync/enable

    chmod 0666 /sys/kernel/tracing/events/workqueue/enable

    chmod 0666 /sys/kernel/debug/tracing/events/workqueue/enable

    chmod 0666 /sys/kernel/tracing/events/regulator/enable

    chmod 0666 /sys/kernel/debug/tracing/events/regulator/enable

    chmod 0666 /sys/kernel/tracing/events/pagecache/enable

    chmod 0666 /sys/kernel/debug/tracing/events/pagecache/enable



    # irq

    chown root shell /sys/kernel/debug/tracing/events/irq/enable

    chown root shell /sys/kernel/debug/tracing/events/ipi/enable

    chmod 0666 /sys/kernel/tracing/events/irq/enable

    chmod 0666 /sys/kernel/debug/tracing/events/irq/enable

    chmod 0666 /sys/kernel/tracing/events/ipi/enable

    chmod 0666 /sys/kernel/debug/tracing/events/ipi/enable



    # disk

    chown root shell /sys/kernel/debug/tracing/events/f2fs/f2fs_sync_file_enter/enable

    chown root shell /sys/kernel/debug/tracing/events/f2fs/f2fs_sync_file_exit/enable

    chown root shell /sys/kernel/debug/tracing/events/f2fs/f2fs_write_begin/enable

    chown root shell /sys/kernel/debug/tracing/events/f2fs/f2fs_write_end/enable

    chown root shell /sys/kernel/debug/tracing/events/ext4/ext4_da_write_begin/enable

    chown root shell /sys/kernel/debug/tracing/events/ext4/ext4_da_write_end/enable

    chown root shell /sys/kernel/debug/tracing/events/ext4/ext4_sync_file_enter/enable

    chown root shell /sys/kernel/debug/tracing/events/ext4/ext4_sync_file_exit/enable

    chown root shell /sys/kernel/debug/tracing/events/block/block_rq_issue/enable

    chown root shell /sys/kernel/debug/tracing/events/block/block_rq_complete/enable



    chmod 0664 /sys/kernel/debug/tracing/events/sync/enable

    chmod 0664 /sys/kernel/debug/tracing/events/workqueue/enable

    chmod 0664 /sys/kernel/debug/tracing/events/regulator/enable

    chmod 0664 /sys/kernel/debug/tracing/events/pagecache/enable



    # irq

    chmod 0664 /sys/kernel/debug/tracing/events/irq/enable

    chmod 0664 /sys/kernel/debug/tracing/events/ipi/enable



    # disk

    chmod 0664 /sys/kernel/debug/tracing/events/f2fs/f2fs_sync_file_enter/enable

    chmod 0664 /sys/kernel/debug/tracing/events/f2fs/f2fs_sync_file_exit/enable

    chmod 0664 /sys/kernel/debug/tracing/events/f2fs/f2fs_write_begin/enable

    chmod 0664 /sys/kernel/debug/tracing/events/f2fs/f2fs_write_end/enable

    chmod 0664 /sys/kernel/debug/tracing/events/ext4/ext4_da_write_begin/enable

    chmod 0664 /sys/kernel/debug/tracing/events/ext4/ext4_da_write_end/enable

    chmod 0664 /sys/kernel/debug/tracing/events/ext4/ext4_sync_file_enter/enable

    chmod 0664 /sys/kernel/debug/tracing/events/ext4/ext4_sync_file_exit/enable

    chmod 0664 /sys/kernel/debug/tracing/events/block/block_rq_issue/enable

    chmod 0664 /sys/kernel/debug/tracing/events/block/block_rq_complete/enable
 
    chmod 0666 /sys/kernel/tracing/events/f2fs/f2fs_sync_file_enter/enable

    chmod 0666 /sys/kernel/debug/tracing/events/f2fs/f2fs_sync_file_enter/enable

    chmod 0666 /sys/kernel/tracing/events/f2fs/f2fs_sync_file_exit/enable

    chmod 0666 /sys/kernel/debug/tracing/events/f2fs/f2fs_sync_file_exit/enable

    chmod 0666 /sys/kernel/tracing/events/f2fs/f2fs_write_begin/enable

    chmod 0666 /sys/kernel/debug/tracing/events/f2fs/f2fs_write_begin/enable

    chmod 0666 /sys/kernel/tracing/events/f2fs/f2fs_write_end/enable

    chmod 0666 /sys/kernel/debug/tracing/events/f2fs/f2fs_write_end/enable

    chmod 0666 /sys/kernel/tracing/events/ext4/ext4_da_write_begin/enable

    chmod 0666 /sys/kernel/debug/tracing/events/ext4/ext4_da_write_begin/enable

    chmod 0666 /sys/kernel/tracing/events/ext4/ext4_da_write_end/enable

    chmod 0666 /sys/kernel/debug/tracing/events/ext4/ext4_da_write_end/enable

    chmod 0666 /sys/kernel/tracing/events/ext4/ext4_sync_file_enter/enable

    chmod 0666 /sys/kernel/debug/tracing/events/ext4/ext4_sync_file_enter/enable

    chmod 0666 /sys/kernel/tracing/events/ext4/ext4_sync_file_exit/enable

    chmod 0666 /sys/kernel/debug/tracing/events/ext4/ext4_sync_file_exit/enable

    chmod 0666 /sys/kernel/tracing/events/block/block_rq_issue/enable

    chmod 0666 /sys/kernel/debug/tracing/events/block/block_rq_issue/enable

    chmod 0666 /sys/kernel/tracing/events/block/block_rq_complete/enable

    chmod 0666 /sys/kernel/debug/tracing/events/block/block_rq_complete/enable