Steven Rostedt (VMware) c1e6e42740 ring-buffer: Protect ring_buffer_reset() from reentrancy ... commit 51d1579466 upstream. The resetting of the entire ring buffer use to simply go through and reset each individual CPU buffer that had its own protection and synchronization. But this was very slow, due to performing a synchronization for each CPU. The code was reshuffled to do one disabling of all CPU buffers, followed by a single RCU synchronization, and then the resetting of each of the CPU buffers. But unfortunately, the mutex that prevented multiple occurrences of resetting the buffer was not moved to the upper function, and there is nothing to protect from it. Take the ring buffer mutex around the global reset. Cc: stable@vger.kernel.org Fixes: b23d7a5f4a ("ring-buffer: speed up buffer resets by avoiding synchronize_rcu for each CPU") Reported-by: "Tzvetomir Stoyanov (VMware)" <tz.stoyanov@gmail.com> Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2021-11-18 14:03:49 +01:00
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blktrace.c	blktrace: Fix uaf in blk_trace access after removing by sysfs	2021-09-30 10:11:05 +02:00
bpf_trace.c	bpf: Add lockdown check for probe_write_user helper	2021-08-15 14:00:25 +02:00
bpf_trace.h	bpf: Use dedicated bpf_trace_printk event instead of trace_printk()	2020-07-13 16:55:49 -07:00
fgraph.c	fgraph: Initialize tracing_graph_pause at task creation	2021-02-10 09:29:16 +01:00
ftrace_internal.h
ftrace.c	tracing: Have all levels of checks prevent recursion	2021-10-27 09:56:56 +02:00
Kconfig	tracing/kprobes: Do the notrace functions check without kprobes on ftrace	2021-01-19 18:27:19 +01:00
kprobe_event_gen_test.c
Makefile	Kbuild updates for v5.9	2020-08-09 14:10:26 -07:00
power-traces.c
preemptirq_delay_test.c
ring_buffer_benchmark.c	sched,tracing: Convert to sched_set_fifo()	2020-07-29 11:43:53 +02:00
ring_buffer.c	ring-buffer: Protect ring_buffer_reset() from reentrancy	2021-11-18 14:03:49 +01:00
rpm-traces.c
synth_event_gen_test.c	tracing: Add support for dynamic strings to synthetic events	2020-10-05 19:32:18 -04:00
trace_benchmark.c
trace_benchmark.h
trace_boot.c	tracing/boot: Fix a hist trigger dependency for boot time tracing	2021-09-22 12:28:03 +02:00
trace_branch.c
trace_clock.c	tracing: Do no increment trace_clock_global() by one	2021-06-23 14:42:50 +02:00
trace_dynevent.c	tracing: Delete repeated words in comments	2020-09-21 21:06:02 -04:00
trace_dynevent.h
trace_entries.h	tracing: Make ftrace packed events have align of 1	2020-06-16 21:21:02 -04:00
trace_event_perf.c
trace_events_filter_test.h
trace_events_filter.c	treewide: Use fallthrough pseudo-keyword	2020-08-23 17:36:59 -05:00
trace_events_hist.c	tracing / histogram: Fix NULL pointer dereference on strcmp() on NULL event name	2021-08-26 08:35:54 -04:00
trace_events_inject.c
trace_events_synth.c	tracing: Make -ENOMEM the default error for parse_synth_field()	2020-11-02 15:58:32 -05:00
trace_events_trigger.c	tracing: Fix event trigger to accept redundant spaces	2020-06-23 21:51:40 -04:00
trace_events.c	tracing: Do not count ftrace events in top level enable output	2021-02-17 11:02:20 +01:00
trace_export.c	treewide: Convert macro and uses of __section(foo) to __section("foo")	2020-10-25 14:51:49 -07:00
trace_functions_graph.c	tracing: make tracing_init_dentry() returns an integer instead of a d_entry pointer	2020-09-18 22:17:14 -04:00
trace_functions.c	tracing: Have all levels of checks prevent recursion	2021-10-27 09:56:56 +02:00
trace_hwlat.c	tracing: Remove WARN_ON in start_thread()	2020-11-30 21:43:07 -05:00
trace_irqsoff.c	tracing: Use pause-on-trace with the latency tracers	2021-02-10 09:29:16 +01:00
trace_kdb.c
trace_kprobe_selftest.c
trace_kprobe_selftest.h
trace_kprobe.c	tracing/probes: Reject events which have the same name of existing one	2021-09-22 12:28:00 +02:00
trace_mmiotrace.c
trace_nop.c
trace_output.c	tracing: Make the space reserved for the pid wider	2020-09-18 12:42:11 -04:00
trace_output.h
trace_preemptirq.c	lockdep: fix order in trace_hardirqs_off_caller()	2020-09-14 10:08:07 +02:00
trace_printk.c	Updates for tracing and bootconfig:	2020-10-15 15:51:28 -07:00
trace_probe_tmpl.h
trace_probe.c	tracing/probes: Reject events which have the same name of existing one	2021-09-22 12:28:00 +02:00
trace_probe.h	tracing/probes: Reject events which have the same name of existing one	2021-09-22 12:28:00 +02:00
trace_sched_switch.c
trace_sched_wakeup.c
trace_selftest_dynamic.c
trace_selftest.c	tracing: Disable ftrace selftests when any tracer is running	2020-12-30 11:54:28 +01:00
trace_seq.c
trace_stack.c	tracing: make tracing_init_dentry() returns an integer instead of a d_entry pointer	2020-09-18 22:17:14 -04:00
trace_stat.c	tracing: make tracing_init_dentry() returns an integer instead of a d_entry pointer	2020-09-18 22:17:14 -04:00
trace_stat.h
trace_synth.h	tracing: Synthetic event field_pos is an index not a boolean	2021-07-28 14:35:45 +02:00
trace_syscalls.c
trace_uprobe.c	tracing/probes: Reject events which have the same name of existing one	2021-09-22 12:28:00 +02:00
trace.c	tracing: Fix NULL pointer dereference in start_creating	2021-08-12 13:22:12 +02:00
trace.h	tracing: Have all levels of checks prevent recursion	2021-10-27 09:56:56 +02:00
tracing_map.c	tracing: Delete repeated words in comments	2020-09-21 21:06:02 -04:00
tracing_map.h