Nikolay Kuratov 746cc474a9 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 18:25:37 +01:00

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rv

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blktrace.c

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bpf_trace.c

bpf: Send signals asynchronously if !preemptible

2025-02-08 09:57:33 +01:00

bpf_trace.h

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error_report-traces.c

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fgraph.c

fgraph: Add READ_ONCE() when accessing fgraph_array[]

2025-01-09 13:33:52 +01:00

fprobe.c

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ftrace_internal.h

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ftrace.c

ftrace: Avoid potential division by zero in function_stat_show()

2025-03-07 18:25:37 +01:00

Kconfig

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kprobe_event_gen_test.c

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Makefile

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pid_list.c

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pid_list.h

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power-traces.c

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preemptirq_delay_test.c

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rethook.c

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ring_buffer_benchmark.c

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ring_buffer.c

ring-buffer: Update pages_touched to reflect persistent buffer content

2025-02-21 14:01:29 +01:00

rpm-traces.c

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synth_event_gen_test.c

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trace_benchmark.c

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trace_benchmark.h

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trace_boot.c

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trace_branch.c

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trace_btf.c

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trace_btf.h

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trace_clock.c

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trace_dynevent.c

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trace_dynevent.h

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trace_entries.h

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trace_eprobe.c

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

2024-12-14 20:04:13 +01:00

trace_event_perf.c

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trace_events_filter_test.h

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trace_events_filter.c

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trace_events_hist.c

tracing: Fix bad hist from corrupting named_triggers list

2025-03-07 18:25:37 +01:00

trace_events_inject.c

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trace_events_synth.c

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trace_events_trigger.c

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trace_events_user.c

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trace_events.c

tracing: Have process_string() also allow arrays

2025-01-09 13:33:32 +01:00

trace_export.c

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trace_fprobe.c

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trace_functions_graph.c

fgraph: Fix set_graph_notrace with setting TRACE_GRAPH_NOTRACE_BIT

2025-02-17 10:05:40 +01:00

trace_functions.c

ftrace: Correct preemption accounting for function tracing.

2025-02-27 04:30:23 -08:00

trace_hwlat.c

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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

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

2025-01-02 10:34:16 +01:00

trace_mmiotrace.c

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trace_nop.c

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trace_osnoise.c

tracing/osnoise: Fix resetting of tracepoints

2025-02-17 10:05:42 +01:00

trace_output.c

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

2024-12-27 14:02:16 +01:00

trace_output.h

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trace_preemptirq.c

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trace_printk.c

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trace_probe_kernel.h

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trace_probe_tmpl.h

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trace_probe.c

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trace_probe.h

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trace_recursion_record.c

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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_synth.h

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trace_syscalls.c

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trace_uprobe.c

bpf: Fix theoretical prog_array UAF in __uprobe_perf_func()

2024-12-19 18:13:09 +01:00

trace.c

tracing: Fix using ret variable in tracing_set_tracer()

2025-02-27 04:30:24 -08:00

trace.h

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

2024-12-27 14:02:16 +01:00

tracing_map.c

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tracing_map.h

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