Tze-nan Wu eb223bf01e 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 05:41:20 +02:00
..
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: Clear the probe_addr for uprobe	2023-09-19 12:20:07 +02:00
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: Fix possible warning on checking all pages used in ftrace_process_locs()	2023-07-27 08:44:44 +02:00
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	Kbuild updates for v5.9	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: Do no increment trace_clock_global() by one	2021-06-23 14:42:50 +02:00
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	tracing: Show size of requested perf buffer	2024-05-02 16:23:43 +02:00
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	module: use RCU to synchronize find_module	2024-06-21 14:52:58 +02:00
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: Add size check when printing trace_marker output	2024-01-25 14:37:37 -08:00
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	Updates for tracing and bootconfig:	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/probes: Have kprobes and uprobes use $COMM too	2022-08-25 11:38:23 +02:00
trace_probe.h	tracing/probe: trace_probe_primary_from_call(): checked list_first_entry	2023-06-09 10:30:16 +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	Tracing updates:	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: Inform kmemleak of saved_cmdlines allocation	2024-02-23 08:42:30 +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 overflow in get_free_elt()	2024-08-19 05:41:20 +02:00
tracing_map.h