diff options
| author | Emil Tsalapatis <emil@etsalapatis.com> | 2026-02-03 13:04:21 -0500 |
|---|---|---|
| committer | Alexei Starovoitov <ast@kernel.org> | 2026-02-03 10:41:16 -0800 |
| commit | 63328bb23f2693fe36e8bcdb972c6040e84d16e4 (patch) | |
| tree | bb96c74e7b882e83191184cb2e84f3cada05ba2e /kernel | |
| parent | f941479a709a534911715cb08d3d71c7074882bd (diff) | |
bpf: Add bpf_stream_print_stack stack dumping kfunc
Add a new kfunc called bpf_stream_print_stack to be used by programs
that need to print out their current BPF stack. The kfunc is essentially
a wrapper around the existing bpf_stream_dump_stack functionality used
to generate stack traces for error events like may_goto violations and
BPF-side arena page faults.
Signed-off-by: Emil Tsalapatis <emil@etsalapatis.com>
Acked-by: Kumar Kartikeya Dwivedi <memxor@gmail.com>
Link: https://lore.kernel.org/r/20260203180424.14057-2-emil@etsalapatis.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/bpf/helpers.c | 1 | ||||
| -rw-r--r-- | kernel/bpf/stream.c | 19 |
2 files changed, 20 insertions, 0 deletions
diff --git a/kernel/bpf/helpers.c b/kernel/bpf/helpers.c index b54ec0e945aa..c30a9f68af6b 100644 --- a/kernel/bpf/helpers.c +++ b/kernel/bpf/helpers.c @@ -4562,6 +4562,7 @@ BTF_ID_FLAGS(func, bpf_strncasestr); BTF_ID_FLAGS(func, bpf_cgroup_read_xattr, KF_RCU) #endif BTF_ID_FLAGS(func, bpf_stream_vprintk, KF_IMPLICIT_ARGS) +BTF_ID_FLAGS(func, bpf_stream_print_stack, KF_IMPLICIT_ARGS) BTF_ID_FLAGS(func, bpf_task_work_schedule_signal, KF_IMPLICIT_ARGS) BTF_ID_FLAGS(func, bpf_task_work_schedule_resume, KF_IMPLICIT_ARGS) BTF_ID_FLAGS(func, bpf_dynptr_from_file) diff --git a/kernel/bpf/stream.c b/kernel/bpf/stream.c index 24730df55e69..be9ce98e9469 100644 --- a/kernel/bpf/stream.c +++ b/kernel/bpf/stream.c @@ -245,6 +245,25 @@ __bpf_kfunc int bpf_stream_vprintk(int stream_id, const char *fmt__str, const vo return ret; } +/* Directly trigger a stack dump from the program. */ +__bpf_kfunc int bpf_stream_print_stack(int stream_id, struct bpf_prog_aux *aux) +{ + struct bpf_stream_stage ss; + struct bpf_prog *prog; + + /* Make sure the stream ID is valid. */ + if (!bpf_stream_get(stream_id, aux)) + return -ENOENT; + + prog = aux->main_prog_aux->prog; + + bpf_stream_stage(ss, prog, stream_id, ({ + bpf_stream_dump_stack(ss); + })); + + return 0; +} + __bpf_kfunc_end_defs(); /* Added kfunc to common_btf_ids */ |