netdev - [PATCH bpf-next] bpf: fix register_btf_kfunc_id_set for !CONFIG_DEBUG_INFO

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-Id: <20220125003845.2857801-1-sdf@google.com>
Date:   Mon, 24 Jan 2022 16:38:45 -0800
From:   Stanislav Fomichev <sdf@...gle.com>
To:     netdev@...r.kernel.org, bpf@...r.kernel.org
Cc:     ast@...nel.org, daniel@...earbox.net, andrii@...nel.org,
        Stanislav Fomichev <sdf@...gle.com>,
        Kumar Kartikeya Dwivedi <memxor@...il.com>
Subject: [PATCH bpf-next] bpf: fix register_btf_kfunc_id_set for !CONFIG_DEBUG_INFO_BTF

Commit dee872e124e8 ("bpf: Populate kfunc BTF ID sets in struct btf")
breaks loading of some modules when CONFIG_DEBUG_INFO_BTF is not set.
register_btf_kfunc_id_set returns -ENOENT to the callers when
there is no module btf. Let's return 0 (success) instead to let
those modules work in !CONFIG_DEBUG_INFO_BTF cases.

Cc: Kumar Kartikeya Dwivedi <memxor@...il.com>
Fixes: dee872e124e8 ("bpf: Populate kfunc BTF ID sets in struct btf")
Signed-off-by: Stanislav Fomichev <sdf@...gle.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 57f5fd5af2f9..24205c2d4f7e 100644
--- a/kernel/bpf/btf.c
+++ b/kernel/bpf/btf.c
@@ -6741,7 +6741,7 @@ int register_btf_kfunc_id_set(enum bpf_prog_type prog_type,
 
 	btf = btf_get_module_btf(kset->owner);
 	if (IS_ERR_OR_NULL(btf))
-		return btf ? PTR_ERR(btf) : -ENOENT;
+		return btf ? PTR_ERR(btf) : 0;
 
 	hook = bpf_prog_type_to_kfunc_hook(prog_type);
 	ret = btf_populate_kfunc_set(btf, hook, kset);
-- 
2.35.0.rc0.227.g00780c9af4-goog