Steven Rostedt (VMware) 34c2a0d0a7 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 19:16:03 +01:00
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blktrace.c	blktrace: Fix uaf in blk_trace access after removing by sysfs	2021-09-24 11:06:15 -06:00
bpf_trace.c	bpf: Fix bpf-next builds without CONFIG_BPF_EVENTS	2021-08-25 19:41:39 -07:00
bpf_trace.h	bpf: Use dedicated bpf_trace_printk event instead of trace_printk()	2020-07-13 16:55:49 -07:00
error_report-traces.c	tracing: add error_report_end trace point	2021-02-26 09:41:02 -08:00
fgraph.c	tracing: Fix various typos in comments	2021-03-23 14:08:18 -04:00
ftrace_internal.h
ftrace.c	ftrace: Fix kernel-doc formatting issues	2021-10-29 09:52:23 -04:00
Kconfig	tracing: Simplify the Kconfig dependency of FTRACE	2021-08-16 11:37:20 -04:00
kprobe_event_gen_test.c
Makefile	tracing: Add a probe that attaches to trace events	2021-08-20 14:18:40 -04:00
power-traces.c
preemptirq_delay_test.c	kernel: trace: preemptirq_delay_test: add cpu affinity	2021-02-02 17:02:07 -05:00
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 19:16:03 +01:00
rpm-traces.c
synth_event_gen_test.c	tracing: Fix various typos in comments	2021-03-23 14:08:18 -04:00
trace_benchmark.c	tracing: Fix some typos in comments	2020-11-10 20:39:40 -05:00
trace_benchmark.h
trace_boot.c	bootconfig: Rename xbc_node_find_child() to xbc_node_find_subkey()	2021-09-09 19:14:33 -04:00
trace_branch.c	tracing: Merge irqflags + preempt counter.	2021-02-02 17:02:06 -05:00
trace_clock.c	tracing: Do no increment trace_clock_global() by one	2021-06-18 09:10:00 -04:00
trace_dynevent.c	tracing: Have dynamic events have a ref counter	2021-08-18 18:13:47 -04:00
trace_dynevent.h	tracing: Add DYNAMIC flag for dynamic events	2021-08-18 18:10:32 -04:00
trace_entries.h	trace: Add timerlat tracer	2021-06-25 19:57:24 -04:00
trace_eprobe.c	tracing: Fix misspelling of "missing"	2021-10-29 09:54:14 -04:00
trace_event_perf.c	tracing: Have dynamic events have a ref counter	2021-08-18 18:13:47 -04:00
trace_events_filter_test.h
trace_events_filter.c	tracing: Update create_system_filter() kernel-doc comment	2021-03-25 16:04:35 -04:00
trace_events_hist.c	tracing: Fix missing * in comment block	2021-10-10 22:27:40 -04:00
trace_events_inject.c	tracing: Merge irqflags + preempt counter.	2021-02-02 17:02:06 -05:00
trace_events_synth.c	tracing: Have dynamic events have a ref counter	2021-08-18 18:13:47 -04:00
trace_events_trigger.c	tracing: Add a probe that attaches to trace events	2021-08-20 14:18:40 -04:00
trace_events.c	tracing: Add migrate-disabled counter to tracing output.	2021-09-03 19:42:35 -04:00
trace_export.c	tracing: Fix some typos in comments	2020-11-10 20:39:40 -05:00
trace_functions_graph.c	tracing: Fix various typos in comments	2021-03-23 14:08:18 -04:00
trace_functions.c	tracing: Add "func_no_repeats" option for function tracing	2021-04-15 14:50:02 -04:00
trace_hwlat.c	tracing: Replace deprecated CPU-hotplug functions.	2021-08-17 15:47:14 -04:00
trace_irqsoff.c	tracing: Merge irqflags + preempt counter.	2021-02-02 17:02:06 -05:00
trace_kdb.c	kdb: Rename members of struct kdbtab_t	2021-07-27 17:05:06 +01:00
trace_kprobe_selftest.c
trace_kprobe_selftest.h
trace_kprobe.c	tracing: Add a probe that attaches to trace events	2021-08-20 14:18:40 -04:00
trace_mmiotrace.c	tracing: Remove definition of DEBUG in trace_mmiotrace.c	2021-02-02 17:02:07 -05:00
trace_nop.c
trace_osnoise.c	tracing/osnoise: Fix missed cpus_read_unlock() in start_per_cpu_kthreads()	2021-09-08 15:10:24 -04:00
trace_output.c	tracing: Add migrate-disabled counter to tracing output.	2021-09-03 19:42:35 -04:00
trace_output.h	ftrace: Add recording of functions that caused recursion	2020-11-06 08:42:26 -05:00
trace_preemptirq.c	lockdep: fix order in trace_hardirqs_off_caller()	2020-09-14 10:08:07 +02:00
trace_printk.c	tracing: Add a verifier to check string pointers for trace events	2021-03-18 12:58:27 -04:00
trace_probe_tmpl.h	tracing/probes: Have process_fetch_insn() take a void * instead of pt_regs	2021-08-19 09:09:03 -04:00
trace_probe.c	tracing: Add a probe that attaches to trace events	2021-08-20 14:18:40 -04:00
trace_probe.h	tracing: Add a probe that attaches to trace events	2021-08-20 14:18:40 -04:00
trace_recursion_record.c	ftrace: Add recording of functions that caused recursion	2020-11-06 08:42:26 -05:00
trace_sched_switch.c
trace_sched_wakeup.c	tracing: Change variable type as bool for clean-up	2021-06-30 09:19:14 -04:00
trace_selftest_dynamic.c
trace_selftest.c	tracing: Fix various typos in comments	2021-03-23 14:08:18 -04:00
trace_seq.c	tracing: Fix various typos in comments	2021-03-23 14:08:18 -04:00
trace_stack.c	ftrace: Have the callbacks receive a struct ftrace_regs instead of pt_regs	2020-11-13 12:14:55 -05:00
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: synth events: increase max fields count	2021-09-08 15:29:16 -04:00
trace_syscalls.c	tracing: Merge irqflags + preempt counter.	2021-02-02 17:02:06 -05:00
trace_uprobe.c	tracing/probes: Reject events which have the same name of existing one	2021-08-19 09:15:19 -04:00
trace.c	tracing: Fix missing osnoise tracer on max_latency	2021-10-07 09:41:47 -04:00
trace.h	tracing: Add a probe that attaches to trace events	2021-08-20 14:18:40 -04:00
tracing_map.c	tracing: Fix some typos in comments	2020-11-10 20:39:40 -05:00
tracing_map.h	tracing: Fix some typos in comments	2020-11-10 20:39:40 -05:00