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mirror-linux/kernel/trace
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Masami Hiramatsu (Google) 657b594b20 fprobe: Fix unregister_fprobe() to wait for RCU grace period 
Commit 4346ba1604 ("fprobe: Rewrite fprobe on function-graph tracer")
changed fprobe to register struct fprobe to an rcu-hlist, but it forgot
to wait for RCU GP. Thus there can be use-after-free if the fprobe is
released right after unregistering. This can be happened on fprobe
event and sample module code.

To fix this issue, add synchronize_rcu() in unregister_fprobe().

Note that BPF is OK because fprobe is used as a part of
bpf_kprobe_multi_link. This unregisters its fprobe in
bpf_kprobe_multi_link_release() and it is deallocated via
bpf_kprobe_multi_link_dealloc(), which is invoked from
bpf_link_defer_dealloc_rcu_gp() RCU callback.

For BPF, this also introduced unregister_fprobe_async() which does
NOT wait for RCU grace priod.

Link: https://lore.kernel.org/all/177813998919.256460.2809243930741138224.stgit@mhiramat.tok.corp.google.com/

Fixes: 4346ba1604 ("fprobe: Rewrite fprobe on function-graph tracer")
Signed-off-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
 		2026-05-11 19:04:46 +09:00
..
rv rv: Allow epoll in rtapp-sleep monitor 2026-04-01 15:18:30 +02:00
Kconfig tracing: Add a trace remote module for testing 2026-03-09 12:33:55 -04:00
Makefile tracing: Make undefsyms_base.c a first-class citizen 2026-04-22 11:24:41 -04:00
blktrace.c block-7.0-20260305 2026-03-06 08:36:18 -08:00
bpf_trace.c fprobe: Fix unregister_fprobe() to wait for RCU grace period 2026-05-11 19:04:46 +09:00
bpf_trace.h
…
error_report-traces.c
…
fgraph.c fgraph: Do not call handlers direct when not using ftrace_ops 2026-02-19 15:21:22 -05:00
fprobe.c fprobe: Fix unregister_fprobe() to wait for RCU grace period 2026-05-11 19:04:46 +09:00
ftrace.c tracing updates for v7.1: 2026-04-17 09:43:12 -07:00
ftrace_internal.h
…
kprobe_event_gen_test.c
…
pid_list.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
pid_list.h trace/pid_list: optimize pid_list->lock contention 2025-11-13 15:15:54 -05:00
power-traces.c PM: cpufreq: powernv/tracing: Move powernv_throttle trace event 2025-07-21 16:40:56 -04:00
preemptirq_delay_test.c kernel: trace: preemptirq_delay_test: use offstack cpu mask 2025-07-08 18:17:38 -04:00
remote_test.c tracing: Add a trace remote module for testing 2026-03-09 12:33:55 -04:00
remote_test_events.h tracing: Add a trace remote module for testing 2026-03-09 12:33:55 -04:00
rethook.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
ring_buffer.c ring-buffer: Do not double count the reader_page 2026-04-24 15:34:39 -04:00
ring_buffer_benchmark.c tracing: Fix typo in ring_buffer_benchmark.c 2025-12-05 15:43:40 -05:00
rpm-traces.c
…
simple_ring_buffer.c tracing: load/unload page callbacks for simple_ring_buffer 2026-03-09 12:33:55 -04:00
synth_event_gen_test.c
…
trace.c tracing updates for v7.1: 2026-04-17 09:43:12 -07:00
trace.h tracing updates for v7.1: 2026-04-17 09:43:12 -07:00
trace_benchmark.c
…
trace_benchmark.h
…
trace_boot.c tracing: Make the backup instance non-reusable 2026-04-02 13:20:38 -04:00
trace_branch.c tracing: branch: Fix inverted check on stat tracer registration 2026-04-28 14:28:29 -04:00
trace_btf.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
trace_btf.h
…
trace_clock.c
…
trace_dynevent.c tracing: Report wrong dynamic event command 2025-11-10 19:26:14 -05:00
trace_dynevent.h tracing: probes: Fix a possible race in trace_probe_log APIs 2025-05-13 22:23:34 +09:00
trace_entries.h tracing: Fix ftrace event field alignments 2026-02-05 09:47:11 -05:00
trace_eprobe.c Convert 'alloc_flex' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
trace_event_perf.c perf: Remove unnecessary parameter of security check 2025-02-26 14:13:58 -05:00
trace_events.c tracing updates for v7.1: 2026-04-17 09:43:12 -07:00
trace_events_filter.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
trace_events_filter_test.h
…
trace_events_hist.c tracing: Fix fully-qualified variable reference printing in histograms 2026-04-14 05:28:10 -04:00
trace_events_inject.c
…
trace_events_synth.c tracing: Use explicit array size instead of sentinel elements in symbol printing 2026-03-12 12:15:53 +01:00
trace_events_trigger.c tracing: Drain deferred trigger frees if kthread creation fails 2026-03-28 08:32:44 -04:00
trace_events_user.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
trace_export.c tracing: Fix ftrace event field alignments 2026-02-05 09:47:11 -05:00
trace_fprobe.c Convert 'alloc_flex' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
trace_functions.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
trace_functions_graph.c fgraph: Fix thresh_return nosleeptime double-adjust 2026-03-03 22:11:20 -05:00
trace_hwlat.c tracing: Fix false sharing in hwlat get_sample() 2026-02-10 03:36:39 -05:00
trace_irqsoff.c tracing: Allow tracer to add more than 32 options 2025-11-04 21:44:00 +09:00
trace_kdb.c tracing: Allow tracer to add more than 32 options 2025-11-04 21:44:00 +09:00
trace_kprobe.c tracing updates for v7.1: 2026-04-17 09:43:12 -07:00
trace_kprobe_selftest.c
…
trace_kprobe_selftest.h
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trace_mmiotrace.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
trace_nop.c
…
trace_osnoise.c tracing latency updates for 7.1: 2026-04-17 10:12:11 -07:00
trace_output.c tracing updates for v7.1: 2026-04-17 09:43:12 -07:00
trace_output.h tracing: Allow tracer to add more than 32 options 2025-11-04 21:44:00 +09:00
trace_pid.c tracing: Move pid filtering into trace_pid.c 2026-02-08 21:01:13 -05:00
trace_preemptirq.c tracing: Fix archs that still call tracepoints without RCU watching 2024-12-05 09:28:58 -05:00
trace_printk.c tracing: move __printf() attribute on __ftrace_vbprintk() 2026-03-23 20:16:45 -04:00
trace_probe.c tracing/probes: Limit size of event probe to 3K 2026-04-29 16:07:38 -04:00
trace_probe.h tracing/probes: Limit size of event probe to 3K 2026-04-29 16:07:38 -04:00
trace_probe_kernel.h
…
trace_probe_tmpl.h tracing/fprobe: Enable fprobe events with CONFIG_DYNAMIC_FTRACE_WITH_ARGS 2024-12-26 10:50:04 -05:00
trace_recursion_record.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
trace_remote.c tracing: Non-consuming read for trace remotes with an offline CPU 2026-04-02 14:16:09 +01:00
trace_sched_switch.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
trace_sched_wakeup.c tracing: Allow tracer to add more than 32 options 2025-11-04 21:44:00 +09:00
trace_selftest.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
trace_selftest_dynamic.c
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trace_seq.c tracing: Add bitmask-list option for human-readable bitmask display 2026-01-26 17:00:50 -05:00
trace_snapshot.c tracing: Remove duplicate latency_fsnotify() stub 2026-03-31 14:58:39 -04:00
trace_stack.c tracing updates for v6.16: 2025-05-29 21:04:36 -07:00
trace_stat.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
trace_stat.h
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trace_synth.h
…
trace_syscalls.c tracing: Use explicit array size instead of sentinel elements in symbol printing 2026-03-12 12:15:53 +01:00
trace_uprobe.c Convert 'alloc_flex' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
tracing_map.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
tracing_map.h
…
undefsyms_base.c tracing: Make undefsyms_base.c a first-class citizen 2026-04-22 11:24:41 -04:00