Hao Sun a3d81bc1ea bpf: Skip task with pid=1 in send_signal_common() ... The following kernel panic can be triggered when a task with pid=1 attaches a prog that attempts to send killing signal to itself, also see [1] for more details: Kernel panic - not syncing: Attempted to kill init! exitcode=0x0000000b CPU: 3 PID: 1 Comm: systemd Not tainted 6.1.0-09652-g59fe41b5255f #148 Call Trace: <TASK> __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x100/0x178 lib/dump_stack.c:106 panic+0x2c4/0x60f kernel/panic.c:275 do_exit.cold+0x63/0xe4 kernel/exit.c:789 do_group_exit+0xd4/0x2a0 kernel/exit.c:950 get_signal+0x2460/0x2600 kernel/signal.c:2858 arch_do_signal_or_restart+0x78/0x5d0 arch/x86/kernel/signal.c:306 exit_to_user_mode_loop kernel/entry/common.c:168 [inline] exit_to_user_mode_prepare+0x15f/0x250 kernel/entry/common.c:203 __syscall_exit_to_user_mode_work kernel/entry/common.c:285 [inline] syscall_exit_to_user_mode+0x1d/0x50 kernel/entry/common.c:296 do_syscall_64+0x44/0xb0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x63/0xcd So skip task with pid=1 in bpf_send_signal_common() to avoid the panic. [1] https://lore.kernel.org/bpf/20221222043507.33037-1-sunhao.th@gmail.com Signed-off-by: Hao Sun <sunhao.th@gmail.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Acked-by: Stanislav Fomichev <sdf@google.com> Link: https://lore.kernel.org/bpf/20230106084838.12690-1-sunhao.th@gmail.com		2023-01-06 22:48:58 +01:00
..
rv	rv/monitors: Move monitor structure in rodata	2022-12-20 11:46:40 -05:00
blktrace.c	blktrace: Fix output non-blktrace event when blk_classic option enabled	2022-12-08 09:26:11 -07:00
bpf_trace.c	bpf: Skip task with pid=1 in send_signal_common()	2023-01-06 22:48:58 +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	tracing/fprobe: Fix to check whether fprobe is registered correctly	2022-11-04 08:50:07 +09:00
ftrace_internal.h
ftrace.c	Tracing updates for 6.2:	2022-12-15 18:01:16 -08:00
Kconfig	powerpc updates for 6.2	2022-12-19 07:13:33 -06:00
kprobe_event_gen_test.c	tracing: kprobe: Fix potential null-ptr-deref on trace_array in kprobe_event_gen_test_exit()	2022-11-18 10:15:34 +09:00
Makefile	rv: Add Runtime Verification (RV) interface	2022-07-30 14:01:28 -04:00
pid_list.c	tracing: Cleanup double word in comment	2022-04-26 17:58:50 -04:00
pid_list.h	tracing: Create a sparse bitmask for pid filtering	2021-10-05 17:38:45 -04:00
power-traces.c
preemptirq_delay_test.c
rethook.c	rethook: fix a potential memleak in rethook_alloc()	2022-11-18 10:15:34 +09:00
ring_buffer_benchmark.c	ring_buffer: Remove unused "event" parameter	2022-11-23 19:08:30 -05:00
ring_buffer.c	ring-buffer: Handle resize in early boot up	2022-12-10 13:36:04 -05:00
rpm-traces.c
synth_event_gen_test.c	tracing: Fix memory leak in test_gen_synth_cmd() and test_empty_synth_event()	2022-11-17 17:51:38 -05:00
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	tracing: Do no increment trace_clock_global() by one	2021-06-18 09:10:00 -04:00
trace_dynevent.c	tracing: Free buffers when a used dynamic event is removed	2022-11-23 19:07:12 -05:00
trace_dynevent.h	tracing: Add DYNAMIC flag for dynamic events	2021-08-18 18:10:32 -04:00
trace_entries.h	trace: Add timerlat tracer	2021-06-25 19:57:24 -04:00
trace_eprobe.c	tracing: Fix race where eprobes can be called before the event	2022-11-24 00:42:18 +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/filter: Call filter predicate functions directly via a switch statement	2022-09-26 13:01:10 -04:00
trace_events_hist.c	tracing/hist: Fix issue of losting command info in error_log	2022-12-10 13:36:04 -05:00
trace_events_inject.c	tracing: Support __rel_loc relative dynamic data location attribute	2021-12-06 15:37:21 -05:00
trace_events_synth.c	tracing: Fix issue of missing one synthetic field	2022-12-10 13:36:04 -05:00
trace_events_trigger.c	tracing: Do not synchronize freeing of trigger filter on boot up	2022-12-14 08:50:56 -05:00
trace_events_user.c	Tracing updates for 6.2:	2022-12-15 18:01:16 -08:00
trace_events.c	tracing: remove unnecessary trace_trigger ifdef	2022-12-10 13:36:04 -05:00
trace_export.c
trace_functions_graph.c	tracing: in_irq() cleanup	2021-10-13 18:19:41 -04:00
trace_functions.c	ftrace: disable preemption when recursion locked	2021-10-27 11:21:49 -04:00
trace_hwlat.c	trace/hwlat: make use of the helper function kthread_run_on_cpu()	2022-01-15 16:30:24 +02:00
trace_irqsoff.c
trace_kdb.c	kdb: Rename members of struct kdbtab_t	2021-07-27 17:05:06 +01:00
trace_kprobe_selftest.c
trace_kprobe_selftest.h
trace_kprobe.c	trace/kprobe: remove duplicated calls of ring_buffer_event_data	2022-12-09 23:48:05 -05:00
trace_mmiotrace.c
trace_nop.c
trace_osnoise.c	tracing/osnoise: Add preempt and/or irq disabled options	2022-12-10 13:36:05 -05:00
trace_output.c	tracing: Fix some checker warnings	2022-12-10 13:36:05 -05:00
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	tracing: Disable "other" permission bits in the tracefs files	2021-10-08 18:08:43 -04:00
trace_probe_kernel.h	tracing: Add "(fault)" name injection to kernel probes	2022-10-12 13:50:20 -04:00
trace_probe_tmpl.h	tracing/probes: Add symstr type for dynamic events	2022-12-15 08:48:57 +09:00
trace_probe.c	Trace probes updates for 6.2:	2022-12-21 18:57:24 -08:00
trace_probe.h	tracing/probes: Reject symbol/symstr type for uprobe	2022-12-15 09:00:20 +09:00
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	sched/tracing: Append prev_state to tp args instead	2022-05-12 00:37:11 +02:00
trace_selftest_dynamic.c
trace_selftest.c	x86/ftrace: Make it call depth tracking aware	2022-10-17 16:41:19 +02:00
trace_seq.c
trace_stack.c	tracing: Disable "other" permission bits in the tracefs files	2021-10-08 18:08:43 -04:00
trace_stat.c	tracing: Disable "other" permission bits in the tracefs files	2021-10-08 18:08:43 -04:00
trace_stat.h
trace_synth.h	tracing: synth events: increase max fields count	2021-09-08 15:29:16 -04:00
trace_syscalls.c	tracing: Remove unused __bad_type_size() method	2022-11-17 20:21:06 -05:00
trace_uprobe.c	tracing/probes: Reject symbol/symstr type for uprobe	2022-12-15 09:00:20 +09:00
trace.c	Trace probes updates for 6.2:	2022-12-21 18:57:24 -08:00
trace.h	tracing: Fix some checker warnings	2022-12-10 13:36:05 -05:00
tracing_map.c	tracing: Remove unused variable 'dups'	2022-10-03 12:20:31 -04:00
tracing_map.h