From: Andrii Nakryiko andrii@kernel.org
mainline inclusion from mainline-5.11-rc5 commit bcc5e6162d66d44f7929f30fce032f95855fc8b4 category: feature bugzilla: https://gitee.com/openeuler/kernel/issues/I5EUVD CVE: NA
Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?i...
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Some modules don't declare any new types and end up with an empty BTF, containing only valid BTF header and no types or strings sections. This currently causes BTF validation error. There is nothing wrong with such BTF, so fix the issue by allowing module BTFs with no types or strings.
Fixes: 36e68442d1af ("bpf: Load and verify kernel module BTFs") Reported-by: Christopher William Snowhill chris@kode54.net Signed-off-by: Andrii Nakryiko andrii@kernel.org Signed-off-by: Daniel Borkmann daniel@iogearbox.net Acked-by: Yonghong Song yhs@fb.com Link: https://lore.kernel.org/bpf/20210110070341.1380086-1-andrii@kernel.org (cherry picked from commit bcc5e6162d66d44f7929f30fce032f95855fc8b4) Signed-off-by: Wang Yufen wangyufen@huawei.com --- kernel/bpf/btf.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/kernel/bpf/btf.c b/kernel/bpf/btf.c index 3edf141cc146..86e062b3e32a 100644 --- a/kernel/bpf/btf.c +++ b/kernel/bpf/btf.c @@ -4172,7 +4172,7 @@ static int btf_parse_hdr(struct btf_verifier_env *env) return -ENOTSUPP; }
- if (btf_data_size == hdr->hdr_len) { + if (!btf->base_btf && btf_data_size == hdr->hdr_len) { btf_verifier_log(env, "No data"); return -EINVAL; }