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bpf: Add bpf_stream_print_stack stack dumping kfunc

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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>
This commit is contained in:
Emil Tsalapatis 2026-02-03 13:04:21 -05:00 • committed by Alexei Starovoitov
parent f941479a70
commit 63328bb23f
2 changed files with 20 additions and 0 deletions
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1
kernel/bpf/helpers.c
View file

@ -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)

19
kernel/bpf/stream.c
View file

@ -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 */