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linux/kernel/trace
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Jiri Olsa 2ebadb60cb bpf: Return error for missed kprobe multi bpf program execution 
When kprobe multi bpf program can't be executed due to recursion check,
we currently return 0 (success) to fprobe layer where it's ignored for
standard kprobe multi probes.

For kprobe session the success return value will make fprobe layer to
install return probe and try to execute it as well.

But the return session probe should not get executed, because the entry
part did not run. FWIW the return probe bpf program most likely won't get
executed, because its recursion check will likely fail as well, but we
don't need to run it in the first place.. also we can make this clear
and obvious.

It also affects missed counts for kprobe session program execution, which
are now doubled (extra count for not executed return probe).

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Acked-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
Link: https://lore.kernel.org/r/20250106175048.1443905-1-jolsa@kernel.org
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
2025-01-08 09:39:58 -08:00
..
rv rv: Fix a typo 2024-10-04 19:09:23 -04:00
blktrace.c blktrace: convert strncpy() to strscpy_pad() 2024-04-25 21:07:08 -07:00
bpf_trace.c bpf: Return error for missed kprobe multi bpf program execution 2025-01-08 09:39:58 -08:00
bpf_trace.h tracing/treewide: Remove second parameter of __assign_str() 2024-05-22 20:14:47 -04:00
error_report-traces.c
fgraph.c fgraph: Use guard(mutex)(&ftrace_lock) for unregister_ftrace_graph() 2024-10-29 07:43:02 -04:00
fprobe.c fprobe: Fix to allocate entry_data_size buffer with rethook instances 2024-03-01 09:18:24 +09:00
ftrace.c tracing updates for v6.13: 2024-11-22 13:27:01 -08:00
ftrace_internal.h function_graph: Make fgraph_update_pid_func() a stub for !DYNAMIC_FTRACE 2024-06-10 18:08:23 -04:00
Kconfig function_graph: Support recording and printing the function return address 2024-10-05 10:14:04 -04:00
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() 2024-07-15 15:07:14 -04:00
pid_list.h
power-traces.c
preemptirq_delay_test.c minmax: make generic MIN() and MAX() macros available everywhere 2024-07-28 15:49:18 -07:00
rethook.c rethook: honor CONFIG_FTRACE_VALIDATE_RCU_IS_WATCHING in rethook_try_get() 2024-05-01 23:18:48 +09:00
ring_buffer.c trace ring-buffer updates for v6.13 2024-11-22 13:11:17 -08:00
ring_buffer_benchmark.c ring-buffer: Use str_low_high() helper in ring_buffer_producer() 2024-10-19 11:12:25 -04:00
rpm-traces.c
synth_event_gen_test.c tracing / synthetic: Disable events after testing in synth_event_gen_test_init() 2023-12-21 10:04:45 -05:00
trace.c tracing: Record task flag NEED_RESCHED_LAZY. 2024-11-22 17:49:39 -05:00
trace.h tracing updates for v6.13: 2024-11-22 13:27:01 -08:00
trace_benchmark.c tracing: Improve benchmark test performance by using do_div() 2024-05-13 20:00:57 -04:00
trace_benchmark.h
trace_boot.c tracing: Allow creating instances with specified system events 2023-12-18 23:14:16 -05:00
trace_branch.c tracing: Remove TRACE_EVENT_FL_FILTERED logic 2024-10-08 15:24:49 -04:00
trace_btf.c tracing/probes: Fix to search structure fields correctly 2024-02-17 21:25:42 +09:00
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 tracing: Use atomic64_inc_return() in trace_clock_counter() 2024-10-09 19:59:49 -04:00
trace_dynevent.c
trace_dynevent.h
trace_entries.h function_graph: Support recording and printing the function return address 2024-10-05 10:14:04 -04:00
trace_eprobe.c tracing/eprobe: Fix to release eprobe when failed to add dyn_event 2024-12-08 23:25:09 +09:00
trace_event_perf.c trace/trace_event_perf: remove duplicate samples on the first tracepoint event 2024-10-09 19:44:54 -04:00
trace_events.c tracing: Remove TRACE_EVENT_FL_FILTERED logic 2024-10-08 15:24:49 -04:00
trace_events_filter.c tracing: Replace multiple deprecated strncpy with memcpy 2024-10-30 19:41:08 -04:00
trace_events_filter_test.h
trace_events_hist.c tracing: Remove redundant check on field->field in histograms 2024-11-12 11:36:57 -05:00
trace_events_inject.c tracing: Have format file honor EVENT_FILE_FL_FREED 2024-08-07 18:12:46 -04:00
trace_events_synth.c tracing/synthetic: Fix trace_string() return value 2024-02-15 11:40:01 -05:00
trace_events_trigger.c tracing: Have format file honor EVENT_FILE_FL_FREED 2024-08-07 18:12:46 -04:00
trace_events_user.c tracepoints: Use new static branch API 2024-10-08 21:17:39 -04:00
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/probes: Fix MAX_TRACE_ARGS limit handling 2024-10-23 17:24:44 +09:00
trace_functions.c ftrace: Get the true parent ip for function tracer 2024-11-18 12:02:43 -05:00
trace_functions_graph.c tracing updates for v6.13: 2024-11-22 13:27:01 -08:00
trace_hwlat.c tracing: Remove TRACE_EVENT_FL_FILTERED logic 2024-10-08 15:24:49 -04:00
trace_irqsoff.c fgraph: Simplify return address printing in function graph tracer 2024-10-10 14:06:26 -04:00
trace_kdb.c trace: kdb: Replace simple_strtoul with kstrtoul in kdb_ftdump 2024-11-02 08:33:13 +00:00
trace_kprobe.c tracing/probes: Fix MAX_TRACE_ARGS limit handling 2024-10-23 17:24:44 +09:00
trace_kprobe_selftest.c tracing: arm64: Avoid missing-prototype warnings 2023-07-12 12:06:04 -04:00
trace_kprobe_selftest.h
trace_mmiotrace.c tracing: Remove TRACE_EVENT_FL_FILTERED logic 2024-10-08 15:24:49 -04:00
trace_nop.c
trace_osnoise.c tracing: Remove TRACE_EVENT_FL_FILTERED logic 2024-10-08 15:24:49 -04:00
trace_output.c tracing: Record task flag NEED_RESCHED_LAZY. 2024-11-22 17:49:39 -05:00
trace_output.h tracing: Add "fields" option to show raw trace event fields 2023-03-29 06:52:08 -04:00
trace_preemptirq.c tracing: Fix archs that still call tracepoints without RCU watching 2024-12-05 09:28:58 -05:00
trace_printk.c
trace_probe.c tracing: Consider the NULL character when validating the event length 2024-10-23 17:24:47 +09:00
trace_probe.h tracing/probes: support '%pd' type for print struct dentry's name 2024-05-01 23:18:47 +09:00
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: Support $argN in return probe (kprobe and fprobe) 2024-03-07 00:27:34 +09:00
trace_recursion_record.c
trace_sched_switch.c tracing: Replace strncpy() with strscpy() when copying comm 2024-11-01 14:37:31 -04:00
trace_sched_wakeup.c fgraph: Simplify return address printing in function graph tracer 2024-10-10 14:06:26 -04:00
trace_selftest.c ftrace updates for v6.13: 2024-11-20 11:34:10 -08:00
trace_selftest_dynamic.c
trace_seq.c trace_seq: Increase the buffer size to almost two pages 2023-12-18 23:14:16 -05:00
trace_stack.c sysctl: treewide: constify the ctl_table argument of proc_handlers 2024-07-24 20:59:29 +02:00
trace_stat.c
trace_stat.h
trace_synth.h
trace_syscalls.c tracing/perf: Add might_fault check to syscall probes 2024-10-09 17:09:46 -04:00
trace_uprobe.c bpf: Fix theoretical prog_array UAF in __uprobe_perf_func() 2024-12-10 13:06:51 -08:00
tracing_map.c tracing: Fix cmp_entries_dup() to respect sort() comparison rules 2024-12-04 10:38:24 -05:00
tracing_map.h tracing: Remove unused extern declaration tracing_map_set_field_descr() 2023-07-23 11:08:14 -04:00