diff options
| author | Stanislav Fomichev <sdf@google.com> | 2022-08-04 13:11:39 -0700 |
|---|---|---|
| committer | Daniel Borkmann <daniel@iogearbox.net> | 2022-08-08 15:53:17 +0200 |
| commit | 6644aabbd8973a9f8008cabfd054a36b69a3a3f5 (patch) | |
| tree | 1e03f9cee39a4d071d54bc204637672175a43257 /kernel | |
| parent | f1d41f7720c89705c20e4335a807b1c518c2e7be (diff) | |
| download | linux-6644aabbd8973a9f8008cabfd054a36b69a3a3f5.tar.bz2 | |
bpf: Use proper target btf when exporting attach_btf_obj_id
When attaching to program, the program itself might not be attached
to anything (and, hence, might not have attach_btf), so we can't
unconditionally use 'prog->aux->dst_prog->aux->attach_btf'.
Instead, use bpf_prog_get_target_btf to pick proper target BTF:
* when attached to dst_prog, use dst_prog->aux->btf
* when attached to kernel btf, use prog->aux->attach_btf
Fixes: b79c9fc9551b ("bpf: implement BPF_PROG_QUERY for BPF_LSM_CGROUP")
Signed-off-by: Stanislav Fomichev <sdf@google.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Hao Luo <haoluo@google.com>
Acked-by: Martin KaFai Lau <kafai@fb.com>
Link: https://lore.kernel.org/bpf/20220804201140.1340684-1-sdf@google.com
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/bpf/syscall.c | 7 |
1 files changed, 3 insertions, 4 deletions
diff --git a/kernel/bpf/syscall.c b/kernel/bpf/syscall.c index 83c7136c5788..7dc3f8003631 100644 --- a/kernel/bpf/syscall.c +++ b/kernel/bpf/syscall.c @@ -3886,6 +3886,7 @@ static int bpf_prog_get_info_by_fd(struct file *file, union bpf_attr __user *uattr) { struct bpf_prog_info __user *uinfo = u64_to_user_ptr(attr->info.info); + struct btf *attach_btf = bpf_prog_get_target_btf(prog); struct bpf_prog_info info; u32 info_len = attr->info.info_len; struct bpf_prog_kstats stats; @@ -4088,10 +4089,8 @@ static int bpf_prog_get_info_by_fd(struct file *file, if (prog->aux->btf) info.btf_id = btf_obj_id(prog->aux->btf); info.attach_btf_id = prog->aux->attach_btf_id; - if (prog->aux->attach_btf) - info.attach_btf_obj_id = btf_obj_id(prog->aux->attach_btf); - else if (prog->aux->dst_prog) - info.attach_btf_obj_id = btf_obj_id(prog->aux->dst_prog->aux->attach_btf); + if (attach_btf) + info.attach_btf_obj_id = btf_obj_id(attach_btf); ulen = info.nr_func_info; info.nr_func_info = prog->aux->func_info_cnt; |