[PATCH bpf-next v5 2/3] bpf: export crash_kexec() as destructive kfunc
From: Artem Savkov <hidden>
Date: 2022-08-10 06:59:30
Also in:
bpf, lkml
Subsystem:
bpf [general] (safe dynamic programs and tools), the rest · Maintainers:
Alexei Starovoitov, Daniel Borkmann, Andrii Nakryiko, Eduard Zingerman, Kumar Kartikeya Dwivedi, Linus Torvalds
Allow properly marked bpf programs to call crash_kexec(). Signed-off-by: Artem Savkov <redacted> --- kernel/bpf/helpers.c | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+)
diff --git a/kernel/bpf/helpers.c b/kernel/bpf/helpers.c
index a95eb9fb01ff..3c1b9bbcf971 100644
--- a/kernel/bpf/helpers.c
+++ b/kernel/bpf/helpers.c@@ -1725,3 +1725,21 @@ bpf_base_func_proto(enum bpf_func_id func_id) return NULL; } } + +BTF_SET8_START(tracing_btf_ids) +#ifdef CONFIG_KEXEC_CORE +BTF_ID_FLAGS(func, crash_kexec, KF_DESTRUCTIVE) +#endif +BTF_SET8_END(tracing_btf_ids) + +static const struct btf_kfunc_id_set tracing_kfunc_set = { + .owner = THIS_MODULE, + .set = &tracing_btf_ids, +}; + +static int __init kfunc_init(void) +{ + return register_btf_kfunc_id_set(BPF_PROG_TYPE_TRACING, &tracing_kfunc_set); +} + +late_initcall(kfunc_init);
--
2.37.1