diff options
Diffstat (limited to 'kernel/bpf/btf.c')
| -rw-r--r-- | kernel/bpf/btf.c | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/kernel/bpf/btf.c b/kernel/bpf/btf.c index d8d64201c4e0..df966acaaeb1 100644 --- a/kernel/bpf/btf.c +++ b/kernel/bpf/btf.c @@ -4160,6 +4160,37 @@ int btf_struct_access(struct bpf_verifier_log *log, return -EINVAL; } +bool btf_struct_ids_match(struct bpf_verifier_log *log, + int off, u32 id, u32 need_type_id) +{ + const struct btf_type *type; + int err; + + /* Are we already done? */ + if (need_type_id == id && off == 0) + return true; + +again: + type = btf_type_by_id(btf_vmlinux, id); + if (!type) + return false; + err = btf_struct_walk(log, type, off, 1, &id); + if (err != WALK_STRUCT) + return false; + + /* We found nested struct object. If it matches + * the requested ID, we're done. Otherwise let's + * continue the search with offset 0 in the new + * type. + */ + if (need_type_id != id) { + off = 0; + goto again; + } + + return true; +} + int btf_resolve_helper_id(struct bpf_verifier_log *log, const struct bpf_func_proto *fn, int arg) { |