Nikolay Kuratov ca381f60a3 ftrace: Avoid potential division by zero in function_stat_show() ...

commit a1a7eb89ca upstream.

Check whether denominator expression x * (x - 1) * 1000 mod {2^32, 2^64}
produce zero and skip stddev computation in that case.

For now don't care about rec->counter * rec->counter overflow because
rec->time * rec->time overflow will likely happen earlier.

Cc: stable@vger.kernel.org
Cc: Wen Yang <wenyang@linux.alibaba.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Link: https://lore.kernel.org/20250206090156.1561783-1-kniv@yandex-team.ru
Fixes: e31f7939c1 ("ftrace: Avoid potential division by zero in function profiler")
Signed-off-by: Nikolay Kuratov <kniv@yandex-team.ru>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

2025-03-13 12:47:33 +01:00

..

blktrace.c

blktrace: Fix output non-blktrace event when blk_classic option enabled

2023-01-14 10:15:41 +01:00

bpf_trace.c

bpf: Send signals asynchronously if !preemptible

2025-03-13 12:46:51 +01:00

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

x86/ftrace: Have ftrace trampolines turn read-only at the end of system boot up

2020-05-12 18:24:34 -04:00

ftrace.c

ftrace: Avoid potential division by zero in function_stat_show()

2025-03-13 12:47:33 +01:00

Kconfig

tracing: Build event generation tests only as modules

2024-07-05 09:12:37 +02:00

kprobe_event_gen_test.c

tracing: Fix wrong return in kprobe_event_gen_test.c

2023-04-05 11:23:46 +02:00

Makefile

Merge tag 'kbuild-v5.9' of git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild

2020-08-09 14:10:26 -07:00

power-traces.c

…

preemptirq_delay_test.c

tracing: Add MODULE_DESCRIPTION() to preemptirq_delay_test

2024-07-05 09:12:43 +02:00

ring_buffer_benchmark.c

sched,tracing: Convert to sched_set_fifo()

2020-07-29 11:43:53 +02:00

ring_buffer.c

ring-buffer: Fix a race between readers and resize checks

2024-06-16 13:31:59 +02:00

rpm-traces.c

…

synth_event_gen_test.c

tracing / synthetic: Disable events after testing in synth_event_gen_test_init()

2024-01-05 15:12:28 +01:00

trace_benchmark.c

trace: Use pr_warn instead of pr_warning

2019-10-18 15:01:57 +02:00

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

tracing: Make struct ring_buffer less ambiguous

2020-01-13 13:19:38 -05:00

trace_clock.c

tracing: Use atomic64_inc_return() in trace_clock_counter()

2024-12-14 19:48:30 +01:00

trace_dynevent.c

tracing: Free buffers when a used dynamic event is removed

2022-12-08 11:23:58 +01:00

trace_dynevent.h

tracing: Remove check_arg() callbacks from dynevent args

2020-02-01 13:09:23 -05:00

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/trace_event_perf: remove duplicate samples on the first tracepoint event

2024-12-14 19:47:57 +01:00

trace_events_filter_test.h

…

trace_events_filter.c

tracing: Have trace_event_file have ref counters

2023-11-28 16:55:02 +00:00

trace_events_hist.c

tracing/histograms: Return an error if we fail to add histogram to hist_vars list

2023-07-27 08:44:43 +02:00

trace_events_inject.c

tracing: Have event inject files inc the trace array ref count

2023-10-10 21:53:25 +02:00

trace_events_synth.c

tracing: Add tracing_reset_all_online_cpus_unlocked() function

2023-06-28 10:28:06 +02:00

trace_events_trigger.c

Revert "tracing/trigger: Fix to return error if failed to alloc snapshot"

2024-05-02 16:23:36 +02:00

trace_events.c

tracing: Have trace_event_file have ref counters

2023-11-28 16:55:02 +00:00

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: Fix memleak due to race between current_tracer and trace

2023-08-30 16:23:12 +02:00

trace_kdb.c

tracing: Rename trace_buffer to array_buffer

2020-01-13 13:19:38 -05:00

trace_kprobe_selftest.c

…

trace_kprobe_selftest.h

…

trace_kprobe.c

tracing/kprobe: Make trace_kprobe's module callback called after jump_label update

2025-01-09 13:24:57 +01:00

trace_mmiotrace.c

tracing: Make struct ring_buffer less ambiguous

2020-01-13 13:19:38 -05:00

trace_nop.c

…

trace_output.c

tracing: Remove precision vsnprintf() check from print event

2024-10-17 15:08:28 +02:00

trace_output.h

…

trace_preemptirq.c

tracing: hold caller_addr to hardirq_{enable,disable}_ip

2022-09-23 14:16:58 +02:00

trace_printk.c

Merge tag 'trace-v5.10' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace

2020-10-15 15:51:28 -07:00

trace_probe_tmpl.h

tracing/probes: Fix to update dynamic data counter if fetcharg uses it

2023-08-26 15:26:50 +02:00

trace_probe.c

tracing: Consider the NULL character when validating the event length

2024-11-08 16:21:59 +01:00

trace_probe.h

tracing/kprobes: Return EADDRNOTAVAIL when func matches several symbols

2024-10-17 15:08:29 +02:00

trace_sched_switch.c

tracing: Fix sched switch start/stop refcount racy updates

2020-01-30 09:46:10 -05:00

trace_sched_wakeup.c

tracing: Fix memleak due to race between current_tracer and trace

2023-08-30 16:23:12 +02:00

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

tracing: Remove unused TRACE_SEQ_BUF_USED

2020-01-21 18:39:54 -05:00

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

tracing: Use generic type for comparator function

2019-11-14 13:15:11 -05:00

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

Merge tag 'trace-v5.6-2' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace

2020-02-06 07:12:11 +00:00

trace_uprobe.c

bpf: Clear the probe_addr for uprobe

2023-09-19 12:20:07 +02:00

trace.c

tracing: Prevent bad count for tracing_cpumask_write

2025-01-09 13:25:04 +01:00

trace.h

tracing: Have trace_event_file have ref counters

2023-11-28 16:55:02 +00:00

tracing_map.c

tracing: Fix cmp_entries_dup() to respect sort() comparison rules

2024-12-14 19:48:22 +01:00

tracing_map.h

…