Tze-nan Wu a172c7b22b tracing: Fix overflow in get_free_elt() ... commit bcf86c01ca 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>		2024-08-14 13:58:58 +02:00
..
rv	rv: Update rv_en(dis)able_monitor doc to match kernel-doc	2024-06-12 11:12:49 +02:00
blktrace.c	block: remove more NULL checks after bdev_get_queue()	2023-02-21 09:23:22 -07:00
bpf_trace.c	bpf: fix multi-uprobe PID filtering logic	2024-06-21 14:38:22 +02:00
bpf_trace.h
error_report-traces.c
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	kprobe/ftrace: bail out if ftrace was killed	2024-06-27 13:49:03 +02:00
Kconfig	tracing: Build event generation tests only as modules	2024-06-27 13:49:05 +02:00
kprobe_event_gen_test.c	tracing: Fix wrong return in kprobe_event_gen_test.c	2023-03-19 12:20:48 -04:00
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: Remove unused "event" parameter	2022-11-23 19:08:30 -05:00
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
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
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
trace_dynevent.c	tracing: Free buffers when a used dynamic event is removed	2022-11-23 19:07:12 -05:00
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/probes: Support BTF argument on module functions	2023-08-23 09:39:15 +09:00
trace_event_perf.c	tracing/perf: Use strndup_user instead of kzalloc/strncpy_from_user	2022-11-23 19:08:31 -05:00
trace_events_filter_test.h
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 uaf issue when open the hist or hist_debug file	2024-01-20 11:51:43 +01:00
trace_events_inject.c	tracing: Have event inject files inc the trace array ref count	2023-09-07 16:38:54 -04:00
trace_events_synth.c	tracing/synthetic: Fix trace_string() return value	2024-02-23 09:25:05 +01:00
trace_events_trigger.c	tracing/trigger: Fix to return error if failed to alloc snapshot	2024-02-23 09:24:54 +01:00
trace_events_user.c	tracing/user_events: Fix non-spaced field matching	2024-06-12 11:12:11 +02:00
trace_events.c	eventfs/tracing: Add callback for release of an eventfs_inode	2024-06-12 11:12:35 +02:00
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: fprobe-event: Fix to check tracepoint event and return	2023-11-28 17:20:13 +00:00
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
trace_hwlat.c	tracing: Remove extra space at the end of hwlat_detector/mode	2023-09-01 21:00:00 -04:00
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/kprobes: Fix the order of argument descriptions	2023-11-20 11:59:38 +01:00
trace_mmiotrace.c
trace_nop.c
trace_osnoise.c	tracing/timerlat: Move hrtimer_init to timerlat_fd open()	2024-02-23 09:25:05 +01:00
trace_output.c	tracing: Add size check when printing trace_marker output	2024-01-20 11:51:43 +01:00
trace_output.h	tracing: Add "fields" option to show raw trace event fields	2023-03-29 06:52:08 -04:00
trace_preemptirq.c	cpuidle: tracing, preempt: Squash _rcuidle tracing	2023-01-31 15:01:46 +01:00
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: Fix to record 0-length data_loc in fetch_store_string*() if fails	2023-07-14 17:04:58 +09:00
trace_probe.c	tracing/probes: fix error check in parse_btf_field()	2024-06-12 11:12:51 +02:00
trace_probe.h	tracing/probes: Fix to show a parse error for bad type for $comm	2024-02-23 09:25:05 +01:00
trace_recursion_record.c
trace_sched_switch.c
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
trace_selftest.c	tracing: Have function_graph selftest call cond_resched()	2023-05-28 21:15:46 -04:00
trace_seq.c	tracing: Fix kernel-doc warnings in trace_seq.c	2023-07-28 19:59:04 -04:00
trace_stack.c
trace_stat.c
trace_stat.h
trace_synth.h	tracing: Allow synthetic events to pass around stacktraces	2023-01-25 10:31:24 -05:00
trace_syscalls.c	tracing: bpf: use struct trace_entry in struct syscall_tp_t	2023-08-01 10:53:28 -07:00
trace_uprobe.c	Probes updates for v6.6:	2023-09-02 11:10:50 -07:00
trace.c	tracing: Use .flush() call to wake up readers	2024-04-03 15:28:41 +02:00
trace.h	eventfs: Remove eventfs_file and just use eventfs_inode	2024-02-23 09:25:19 +01:00
tracing_map.c	tracing: Fix overflow in get_free_elt()	2024-08-14 13:58:58 +02:00
tracing_map.h	tracing: Remove unused extern declaration tracing_map_set_field_descr()	2023-07-23 11:08:14 -04:00