Tze-nan Wu cd10d186a5 tracing: Fix overflow in get_free_elt() ... commit bcf86c01ca4676316557dd482c8416ece8c2e143 upstream. "tracing_map->next_elt" in get_free_elt() is at risk of overflowing. Once it overflows, new elements can still be inserted into the tracing_map even though the maximum number of elements (`max_elts`) has been reached. Continuing to insert elements after the overflow could result in the tracing_map containing "tracing_map->max_size" elements, leaving no empty entries. If any attempt is made to insert an element into a full tracing_map using `__tracing_map_insert()`, it will cause an infinite loop with preemption disabled, leading to a CPU hang problem. Fix this by preventing any further increments to "tracing_map->next_elt" once it reaches "tracing_map->max_elt". Cc: stable@vger.kernel.org Cc: Masami Hiramatsu <mhiramat@kernel.org> Fixes: 08d43a5fa0 ("tracing: Add lock-free tracing_map") Co-developed-by: Cheng-Jui Wang <cheng-jui.wang@mediatek.com> Link: https://lore.kernel.org/20240805055922.6277-1-Tze-nan.Wu@mediatek.com Signed-off-by: Cheng-Jui Wang <cheng-jui.wang@mediatek.com> Signed-off-by: Tze-nan Wu <Tze-nan.Wu@mediatek.com> Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2024-08-19 05:45:47 +02:00
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Kconfig	tracing: Build event generation tests only as modules	2024-07-05 09:14:29 +02:00
Makefile	tracing: Place trace_pid_list logic into abstract functions	2022-07-29 17:25:29 +02:00
blktrace.c	trace/blktrace: fix memory leak with using debugfs_lookup()	2023-03-10 09:39:47 +01:00
bpf_trace.c	bpf: Remove trace_printk_lock	2024-03-01 13:21:43 +01:00
bpf_trace.h	…
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.c	ftrace: Fix possible use-after-free issue in ftrace_location()	2024-07-05 09:14:12 +02:00
ftrace_internal.h	…
kprobe_event_gen_test.c	tracing: Fix wrong return in kprobe_event_gen_test.c	2023-04-05 11:24:54 +02:00
pid_list.c	tracing: Place trace_pid_list logic into abstract functions	2022-07-29 17:25:29 +02:00
pid_list.h	tracing: Place trace_pid_list logic into abstract functions	2022-07-29 17:25:29 +02:00
power-traces.c	…
preemptirq_delay_test.c	tracing: Add MODULE_DESCRIPTION() to preemptirq_delay_test	2024-07-05 09:14:36 +02:00
ring_buffer.c	ring-buffer: Fix a race between readers and resize checks	2024-06-16 13:39:12 +02:00
ring_buffer_benchmark.c	…
rpm-traces.c	…
synth_event_gen_test.c	tracing / synthetic: Disable events after testing in synth_event_gen_test_init()	2024-01-05 15:13:35 +01:00
trace.c	tracing: Use .flush() call to wake up readers	2024-04-10 16:18:45 +02:00
trace.h	tracing: Fix uaf issue when open the hist or hist_debug file	2024-01-25 14:52:29 -08:00
trace_benchmark.c	…
trace_benchmark.h	…
trace_boot.c	tracing: Initialize integer variable to prevent garbage return value	2022-06-09 10:23:21 +02:00
trace_branch.c	…
trace_clock.c	tracing: Do no increment trace_clock_global() by one	2021-06-18 09:10:00 -04:00
trace_dynevent.c	tracing: Free buffers when a used dynamic event is removed	2022-12-08 11:28:43 +01:00
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	kernel/trace: Fix cleanup logic of enable_trace_eprobe	2023-07-23 13:47:43 +02:00
trace_event_perf.c	tracing: Show size of requested perf buffer	2024-05-02 16:24:47 +02:00
trace_events.c	tracing: hide unused ftrace_event_id_fops	2024-04-17 11:15:16 +02:00
trace_events_filter.c	tracing: Have trace_event_file have ref counters	2023-11-28 16:56:36 +00:00
trace_events_filter_test.h	…
trace_events_hist.c	tracing: Fix uaf issue when open the hist or hist_debug file	2024-01-25 14:52:29 -08:00
trace_events_inject.c	tracing: Have event inject files inc the trace array ref count	2023-10-06 13:18:02 +02:00
trace_events_synth.c	tracing: Have the user copy of synthetic event address use correct context	2023-11-28 16:56:31 +00:00
trace_events_trigger.c	Revert "tracing/trigger: Fix to return error if failed to alloc snapshot"	2024-04-27 17:05:23 +02:00
trace_export.c	…
trace_functions.c	tracing: Add "func_no_repeats" option for function tracing	2021-04-15 14:50:02 -04:00
trace_functions_graph.c	tracing: Disable "other" permission bits in the tracefs files	2021-11-18 19:16:15 +01:00
trace_hwlat.c	tracing: Remove extra space at the end of hwlat_detector/mode	2023-09-19 12:22:48 +02:00
trace_irqsoff.c	tracing: Fix memleak due to race between current_tracer and trace	2023-08-30 16:18:13 +02:00
trace_kdb.c	kdb: Rename members of struct kdbtab_t	2021-07-27 17:05:06 +01:00
trace_kprobe.c	tracing/kprobes: Fix symbol counting logic by looking at modules as well	2024-01-15 18:51:26 +01:00
trace_kprobe_selftest.c	…
trace_kprobe_selftest.h	…
trace_mmiotrace.c	…
trace_nop.c	…
trace_osnoise.c	tracing/osnoise: Fix duration type	2022-12-08 11:28:43 +01:00
trace_output.c	tracing: Add size check when printing trace_marker output	2024-01-25 14:52:29 -08:00
trace_output.h	…
trace_preemptirq.c	tracing: hold caller_addr to hardirq_{enable,disable}_ip	2022-09-20 12:39:43 +02:00
trace_printk.c	tracing: Disable "other" permission bits in the tracefs files	2021-11-18 19:16:15 +01:00
trace_probe.c	Revert "tracing: Add "(fault)" name injection to kernel probes"	2023-08-03 10:22:31 +02:00
trace_probe.h	tracing/kprobes: Return EADDRNOTAVAIL when func matches several symbols	2023-12-23 10:42:00 +01:00
trace_probe_kernel.h	tracing/probes: Fix to record 0-length data_loc in fetch_store_string*() if fails	2023-08-03 10:22:31 +02:00
trace_probe_tmpl.h	tracing/probes: Fix to record 0-length data_loc in fetch_store_string*() if fails	2023-08-03 10:22:31 +02:00
trace_recursion_record.c	tracing: Disable "other" permission bits in the tracefs files	2021-11-18 19:16:15 +01:00
trace_sched_switch.c	…
trace_sched_wakeup.c	tracing: Fix memleak due to race between current_tracer and trace	2023-08-30 16:18:13 +02:00
trace_selftest.c	tracing: Fix various typos in comments	2021-03-23 14:08:18 -04:00
trace_selftest_dynamic.c	…
trace_seq.c	tracing: Fix various typos in comments	2021-03-23 14:08:18 -04:00
trace_stack.c	tracing: Disable "other" permission bits in the tracefs files	2021-11-18 19:16:15 +01:00
trace_stat.c	tracing: Disable "other" permission bits in the tracefs files	2021-11-18 19:16:15 +01:00
trace_stat.h	…
trace_synth.h	tracing: Allow synthetic events to pass around stacktraces	2023-08-03 10:22:30 +02:00
trace_syscalls.c	tracing: Make tp_printk work on syscall tracepoints	2022-06-14 18:36:14 +02:00
trace_uprobe.c	bpf: Clear the probe_addr for uprobe	2023-09-19 12:22:32 +02:00
tracing_map.c	tracing: Fix overflow in get_free_elt()	2024-08-19 05:45:47 +02:00
tracing_map.h	…