Gaurav Kohli a3ec7ba0db trace: Fix race in trace_open and buffer resize call ...

Below race can come, if trace_open and resize of
cpu buffer is running parallely on different cpus

CPUX                                CPUY
				    ring_buffer_resize
				    atomic_read(&buffer->resize_disabled)
tracing_open
tracing_reset_online_cpus
ring_buffer_reset_cpu

rb_reset_cpu
				    rb_update_pages
				    remove/insert pages

resetting pointer

This race can cause data abort or some times infine loop in rb_remove_pages
and rb_insert_pages while checking pages for sanity.

Take ring buffer lock in rb reset to avoid resetting of cpu buffer.

Change-Id: I1d3344cca99e936d4e04a0e430e0ef9a975404c8
Signed-off-by: Gaurav Kohli <gkohli@codeaurora.org>

2020-12-01 21:12:56 +05:30

..

blktrace.c

blktrace: ensure our debugfs dir exists

2020-09-03 11:24:18 +02:00

bpf_trace.c

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ftrace.c

Merge 4.19.150 into android-4.19-stable

2020-10-07 08:45:35 +02:00

ipc_logging_debug.c

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ipc_logging_private.h

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ipc_logging.c

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Kconfig

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Makefile

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msm_rtb.c

Minidump: Add update region support for minidump regions

2020-07-02 09:58:12 +05:30

power-traces.c

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preemptirq_delay_test.c

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ring_buffer_benchmark.c

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ring_buffer.c

trace: Fix race in trace_open and buffer resize call

2020-12-01 21:12:56 +05:30

rpm-traces.c

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trace_benchmark.c

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trace_benchmark.h

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trace_branch.c

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trace_clock.c

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trace_entries.h

tracing: Set kernel_stack's caller size properly

2020-10-01 13:14:31 +02:00

trace_event_perf.c

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trace_events_filter_test.h

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trace_events_filter.c

tracing: Have error path in predicate_parse() free its allocated memory

2020-08-05 10:05:59 +02:00

trace_events_hist.c

Merge android-4.19-stable.149 (9ce79d9) into msm-4.19

2020-10-21 09:25:49 +05:30

trace_events_trigger.c

tracing: Fix event trigger to accept redundant spaces

2020-06-30 23:17:17 -04:00

trace_events.c

Merge android-4.19-stable.149 (9ce79d9) into msm-4.19

2020-10-21 09:25:49 +05:30

trace_export.c

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trace_functions_graph.c

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trace_functions.c

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trace_hwlat.c

tracing/hwlat: Honor the tracing_cpumask

2020-08-21 11:05:33 +02:00

trace_irqsoff.c

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trace_kdb.c

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trace_kprobe_selftest.c

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trace_kprobe_selftest.h

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trace_kprobe.c

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trace_mmiotrace.c

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trace_nop.c

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trace_output.c

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trace_output.h

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trace_preemptirq.c

lockdep: fix order in trace_hardirqs_off_caller()

2020-10-01 13:14:50 +02:00

trace_printk.c

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trace_probe.c

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trace_probe.h

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trace_sched_switch.c

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trace_sched_wakeup.c

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trace_selftest_dynamic.c

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trace_selftest.c

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trace_seq.c

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trace_stack.c

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trace_stat.c

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trace_stat.h

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trace_syscalls.c

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trace_uprobe.c

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trace.c

Merge android-4.19-stable.149 (9ce79d9) into msm-4.19

2020-10-21 09:25:49 +05:30

trace.h

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tracing_map.c

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tracing_map.h

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