Nikolay Kuratov f58a3f8e28 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>

2025-03-07 16:45:44 +01:00

..

rv

rv: Update rv_en(dis)able_monitor doc to match kernel-doc

2024-06-12 11:12:49 +02:00

blktrace.c

…

bpf_trace.c

bpf: Send signals asynchronously if !preemptible

2025-02-08 09:52:08 +01:00

bpf_trace.h

…

error_report-traces.c

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fgraph.c

tracing: arm64: Avoid missing-prototype warnings

2023-07-12 12:06:04 -04:00

fprobe.c

fprobe: Fix to ensure the number of active retprobes is not zero

2023-10-17 10:22:42 +09:00

ftrace_internal.h

tracing: arm64: Avoid missing-prototype warnings

2023-07-12 12:06:04 -04:00

ftrace.c

ftrace: Avoid potential division by zero in function_stat_show()

2025-03-07 16:45:44 +01:00

Kconfig

tracing: Build event generation tests only as modules

2024-06-27 13:49:05 +02:00

kprobe_event_gen_test.c

…

Makefile

tracing/probes: Move finding func-proto API and getting func-param API to trace_btf

2023-08-23 09:39:45 +09:00

pid_list.c

trace/pid_list: Change gfp flags in pid_list_fill_irq()

2024-08-03 08:54:17 +02:00

pid_list.h

…

power-traces.c

…

preemptirq_delay_test.c

tracing: Add MODULE_DESCRIPTION() to preemptirq_delay_test

2024-06-27 13:49:14 +02:00

rethook.c

rethook: Use __rcu pointer for rethook::handler

2023-12-13 18:45:19 +01:00

ring_buffer_benchmark.c

…

ring_buffer.c

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

2024-06-12 11:11:19 +02:00

rpm-traces.c

…

synth_event_gen_test.c

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

2024-01-01 12:42:45 +00:00

trace_benchmark.c

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trace_benchmark.h

…

trace_boot.c

tracing/boot: Test strscpy() against less than zero for error

2023-07-05 10:30:49 -04:00

trace_branch.c

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trace_btf.c

tracing/probes: Fix to search structure fields correctly

2024-02-23 09:25:05 +01:00

trace_btf.h

tracing/probes: Add a function to search a member of a struct/union

2023-08-23 09:40:16 +09:00

trace_clock.c

tracing: Use atomic64_inc_return() in trace_clock_counter()

2024-12-14 20:00:10 +01:00

trace_dynevent.c

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trace_dynevent.h

…

trace_entries.h

tracing: Add back FORTIFY_SOURCE logic to kernel_stack event structure

2023-07-30 18:11:44 -04:00

trace_eprobe.c

tracing/eprobe: Fix to release eprobe when failed to add dyn_event

2024-12-14 20:00:20 +01:00

trace_event_perf.c

trace/trace_event_perf: remove duplicate samples on the first tracepoint event

2024-12-09 10:32:12 +01:00

trace_events_filter_test.h

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trace_events_filter.c

tracing: Have trace_event_file have ref counters

2023-11-08 11:56:21 +01:00

trace_events_hist.c

tracing: Fix bad hist from corrupting named_triggers list

2025-03-07 16:45:44 +01:00

trace_events_inject.c

tracing: Have format file honor EVENT_FILE_FL_FREED

2024-09-04 13:28:22 +02:00

trace_events_synth.c

tracing/synthetic: Fix trace_string() return value

2024-02-23 09:25:05 +01:00

trace_events_trigger.c

tracing: Have format file honor EVENT_FILE_FL_FREED

2024-09-04 13:28:22 +02:00

trace_events_user.c

tracing/user_events: Fix non-spaced field matching

2024-06-12 11:12:11 +02:00

trace_events.c

tracing: Check "%s" dereference via the field and not the TP_printk format

2025-01-09 13:31:55 +01:00

trace_export.c

tracing: Add back FORTIFY_SOURCE logic to kernel_stack event structure

2023-07-30 18:11:44 -04:00

trace_fprobe.c

tracing/probes: Fix MAX_TRACE_ARGS limit handling

2024-11-01 01:58:28 +01:00

trace_functions_graph.c

function_graph: Support recording and printing the return value of function

2023-06-20 18:38:37 -04:00

trace_functions.c

ftrace: Correct preemption accounting for function tracing.

2025-02-27 04:10:53 -08:00

trace_hwlat.c

tracing/hwlat: Fix a race during cpuhp processing

2024-10-10 11:57:59 +02:00

trace_irqsoff.c

tracing: Fix memleak due to race between current_tracer and trace

2023-08-17 13:49:37 -04:00

trace_kdb.c

…

trace_kprobe_selftest.c

tracing: arm64: Avoid missing-prototype warnings

2023-07-12 12:06:04 -04:00

trace_kprobe_selftest.h

…

trace_kprobe.c

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

2025-01-02 10:32:03 +01:00

trace_mmiotrace.c

…

trace_nop.c

…

trace_osnoise.c

tracing/osnoise: Fix resetting of tracepoints

2025-02-17 09:40:39 +01:00

trace_output.c

tracing: Check "%s" dereference via the field and not the TP_printk format

2025-01-09 13:31:55 +01:00

trace_output.h

…

trace_preemptirq.c

…

trace_printk.c

…

trace_probe_kernel.h

tracing/probes: Fix to record 0-length data_loc in fetch_store_string*() if fails

2023-07-14 17:04:58 +09:00

trace_probe_tmpl.h

tracing/probes: Support $argN in return probe (kprobe and fprobe)

2024-11-01 01:58:26 +01:00

trace_probe.c

tracing: probes: Fix to zero initialize a local variable

2024-11-01 01:58:34 +01:00

trace_probe.h

tracing/probes: Support $argN in return probe (kprobe and fprobe)

2024-11-01 01:58:26 +01:00

trace_recursion_record.c

…

trace_sched_switch.c

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trace_sched_wakeup.c

tracing: Fix memleak due to race between current_tracer and trace

2023-08-17 13:49:37 -04:00

trace_selftest_dynamic.c

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trace_selftest.c

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trace_seq.c

tracing: Move readpos from seq_buf to trace_seq

2025-01-09 13:31:55 +01:00

trace_stack.c

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trace_stat.c

…

trace_stat.h

…

trace_synth.h

…

trace_syscalls.c

tracing/ftrace: disable preemption in syscall probe

2024-12-14 20:00:10 +01:00

trace_uprobe.c

bpf: Fix theoretical prog_array UAF in __uprobe_perf_func()

2024-12-19 18:11:25 +01:00

trace.c

tracing: Check "%s" dereference via the field and not the TP_printk format

2025-01-09 13:31:55 +01:00

trace.h

tracing: Check "%s" dereference via the field and not the TP_printk format

2025-01-09 13:31:55 +01:00

tracing_map.c

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

2024-12-14 19:59:52 +01:00

tracing_map.h

tracing: Remove unused extern declaration tracing_map_set_field_descr()

2023-07-23 11:08:14 -04:00