Tze-nan Wu 788ea62499 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 13:52:59 +02:00
..
rv	rv: Update rv_en(dis)able_monitor doc to match kernel-doc	2024-06-12 11:03:52 +02:00
blktrace.c	trace/blktrace: fix memory leak with using debugfs_lookup()	2023-03-10 09:33:46 +01:00
bpf_trace.c	bpf: Remove trace_printk_lock	2024-02-23 09:12:51 +01:00
bpf_trace.h
error_report-traces.c
fgraph.c	arm64 fixes for 5.19-rc1:	2022-06-03 14:05:34 -07:00
fprobe.c	fprobe: Fix to ensure the number of active retprobes is not zero	2023-10-25 12:03:12 +02:00
ftrace_internal.h
ftrace.c	ftrace: Fix possible use-after-free issue in ftrace_location()	2024-06-12 11:02:54 +02:00
Kconfig	tracing: Build event generation tests only as modules	2024-06-27 13:46:18 +02:00
kprobe_event_gen_test.c	tracing: Fix wrong return in kprobe_event_gen_test.c	2023-04-06 12:10:41 +02:00
Makefile	rv: Add Runtime Verification (RV) interface	2022-07-30 14:01:28 -04:00
pid_list.c	trace/pid_list: Change gfp flags in pid_list_fill_irq()	2024-08-03 08:49:34 +02:00
pid_list.h
power-traces.c
preemptirq_delay_test.c	tracing: Add MODULE_DESCRIPTION() to preemptirq_delay_test	2024-06-27 13:46:23 +02:00
rethook.c	rethook: Use __rcu pointer for rethook::handler	2023-12-13 18:39:17 +01:00
ring_buffer_benchmark.c
ring_buffer.c	ring-buffer: Fix a race between readers and resize checks	2024-06-12 11:02:56 +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 12:39:07 +00:00
trace_benchmark.c	tracing: Add numeric delta time to the trace event benchmark	2022-09-26 13:01:09 -04:00
trace_benchmark.h	tracing: Add numeric delta time to the trace event benchmark	2022-09-26 13:01:09 -04:00
trace_boot.c	tracing: Initialize integer variable to prevent garbage return value	2022-05-26 21:13:00 -04:00
trace_branch.c
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
trace_eprobe.c	kernel/trace: Fix cleanup logic of enable_trace_eprobe	2023-07-23 13:49:24 +02:00
trace_event_perf.c	tracing/perf: Fix double put of trace event when init fails	2022-08-21 15:56:07 -04:00
trace_events_filter_test.h
trace_events_filter.c	tracing: Have trace_event_file have ref counters	2023-11-28 17:07:23 +00:00
trace_events_hist.c	tracing: Fix uaf issue when open the hist or hist_debug file	2024-01-20 11:50:07 +01:00
trace_events_inject.c	tracing: Have event inject files inc the trace array ref count	2023-09-23 11:11:11 +02:00
trace_events_synth.c	tracing: Have the user copy of synthetic event address use correct context	2023-11-28 17:07:13 +00:00
trace_events_trigger.c	tracing/trigger: Fix to return error if failed to alloc snapshot	2024-02-23 09:12:32 +01:00
trace_events_user.c	tracing/user_events: Fix struct arg size match check	2023-07-23 13:49:47 +02:00
trace_events.c	tracing: hide unused ftrace_event_id_fops	2024-04-17 11:18:26 +02:00
trace_export.c	tracing: Fix TASK_COMM_LEN in trace event format file	2023-02-14 19:11:54 +01:00
trace_functions_graph.c
trace_functions.c
trace_hwlat.c	tracing: Remove extra space at the end of hwlat_detector/mode	2023-09-13 09:42:57 +02:00
trace_irqsoff.c	tracing: Fix memleak due to race between current_tracer and trace	2023-08-30 16:11:00 +02:00
trace_kdb.c
trace_kprobe_selftest.c
trace_kprobe_selftest.h
trace_kprobe.c	tracing/kprobes: Fix symbol counting logic by looking at modules as well	2024-01-05 15:18:40 +01:00
trace_mmiotrace.c
trace_nop.c
trace_osnoise.c	tracing/timerlat: Always wakeup the timerlat thread	2023-06-09 10:34:24 +02:00
trace_output.c	tracing: Add size check when printing trace_marker output	2024-01-20 11:50:07 +01:00
trace_output.h
trace_preemptirq.c	tracing: hold caller_addr to hardirq_{enable,disable}_ip	2022-09-06 22:26:00 -04:00
trace_printk.c
trace_probe_kernel.h	tracing/probes: Fix to record 0-length data_loc in fetch_store_string*() if fails	2023-08-03 10:23:55 +02:00
trace_probe_tmpl.h	tracing/probes: Fix to record 0-length data_loc in fetch_store_string*() if fails	2023-08-03 10:23:55 +02:00
trace_probe.c	Revert "tracing: Add "(fault)" name injection to kernel probes"	2023-08-03 10:23:55 +02:00
trace_probe.h	tracing/kprobes: Return EADDRNOTAVAIL when func matches several symbols	2023-10-25 12:03:16 +02:00
trace_recursion_record.c	tracing: Use trace_create_file() to simplify creation of tracefs entries	2022-05-26 21:12:52 -04:00
trace_sched_switch.c	sched/tracing: Append prev_state to tp args instead	2022-05-12 00:37:11 +02:00
trace_sched_wakeup.c	tracing: Fix memleak due to race between current_tracer and trace	2023-08-30 16:11:00 +02:00
trace_selftest_dynamic.c
trace_selftest.c	tracing: Reset the function filter after completing trampoline/graph selftest	2022-05-25 16:57:37 -04:00
trace_seq.c
trace_stack.c
trace_stat.c
trace_stat.h
trace_synth.h	tracing: Allow synthetic events to pass around stacktraces	2023-08-03 10:23:55 +02:00
trace_syscalls.c	tracing: Remove unused __bad_type_size() method	2022-11-17 20:21:06 -05:00
trace_uprobe.c	bpf: Clear the probe_addr for uprobe	2023-09-13 09:42:30 +02:00
trace.c	tracing: Use .flush() call to wake up readers	2024-04-03 15:19:40 +02:00
trace.h	tracing: Fix uaf issue when open the hist or hist_debug file	2024-01-20 11:50:07 +01:00
tracing_map.c	tracing: Fix overflow in get_free_elt()	2024-08-14 13:52:59 +02:00
tracing_map.h