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bpf: Return -ENOTSUPP when attaching to non-kernel BTF 

Return -ENOTSUPP if tracing BPF program is attempted to be attached with
specified attach_btf_obj_fd pointing to non-kernel (neither vmlinux nor
module) BTF object. This scenario might be supported in the future and isn't
outright invalid, so -EINVAL isn't the most appropriate error code.

Suggested-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/bpf/20201208064326.667389-1-andrii@kernel.org
This commit is contained in:
Andrii Nakryiko 2020-12-07 22:43:26 -08:00 committed by Daniel Borkmann
parent 3546b9b8ec
commit 8bdd8e275e
1 changed files with 4 additions and 1 deletions
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5
kernel/bpf/syscall.c
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@ -2121,8 +2121,11 @@ static int bpf_prog_load(union bpf_attr *attr, union bpf_attr __user *uattr)
if (IS_ERR(attach_btf))
return -EINVAL;
if (!btf_is_kernel(attach_btf)) {
/* attaching through specifying bpf_prog's BTF
* objects directly might be supported eventually
*/
btf_put(attach_btf);
return -EINVAL;
return -ENOTSUPP;
}
}
} else if (attr->attach_btf_id) {