linux-kernel - [PATCH] bpf, lsm: Remove bpf_lsm_key

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Message-Id: <20241005-lsm-key_free-v1-1-42ea801dbd63@weissschuh.net>
Date: Sat, 05 Oct 2024 02:06:28 +0200
From: Thomas Weißschuh <linux@...ssschuh.net>
To: KP Singh <kpsingh@...nel.org>, 
 Matt Bobrowski <mattbobrowski@...gle.com>, 
 Alexei Starovoitov <ast@...nel.org>, Daniel Borkmann <daniel@...earbox.net>, 
 Andrii Nakryiko <andrii@...nel.org>, 
 Martin KaFai Lau <martin.lau@...ux.dev>, 
 Eduard Zingerman <eddyz87@...il.com>, Song Liu <song@...nel.org>, 
 Yonghong Song <yonghong.song@...ux.dev>, 
 John Fastabend <john.fastabend@...il.com>, 
 Stanislav Fomichev <sdf@...ichev.me>, Hao Luo <haoluo@...gle.com>, 
 Jiri Olsa <jolsa@...nel.org>, Casey Schaufler <casey@...aufler-ca.com>, 
 Paul Moore <paul@...l-moore.com>, 
 John Johansen <john.johansen@...onical.com>
Cc: bpf@...r.kernel.org, linux-kernel@...r.kernel.org, 
 Thomas Weißschuh <linux@...ssschuh.net>
Subject: [PATCH] bpf, lsm: Remove bpf_lsm_key_free hook

The key_free LSM hook has been removed.
Remove the corresponding BPF hook.

Avoid warnings during the build:
  BTFIDS  vmlinux
WARN: resolve_btfids: unresolved symbol bpf_lsm_key_free

Fixes: 5f8d28f6d7d5 ("lsm: infrastructure management of the key security blob")
Signed-off-by: Thomas Weißschuh <linux@...ssschuh.net>
---
I don't know much about LSMs, so please disregard if this is wrong.
---
 kernel/bpf/bpf_lsm.c | 4 ----
 1 file changed, 4 deletions(-)

diff --git a/kernel/bpf/bpf_lsm.c b/kernel/bpf/bpf_lsm.c
index 6292ac5f9bd139dafb39ecd8bb180be46cd7c7fd..3bc61628ab251e05d7837eb27dabc3b62bcc4783 100644
--- a/kernel/bpf/bpf_lsm.c
+++ b/kernel/bpf/bpf_lsm.c
@@ -339,10 +339,6 @@ BTF_ID(func, bpf_lsm_path_chmod)
 BTF_ID(func, bpf_lsm_path_chown)
 #endif /* CONFIG_SECURITY_PATH */
 
-#ifdef CONFIG_KEYS
-BTF_ID(func, bpf_lsm_key_free)
-#endif /* CONFIG_KEYS */
-
 BTF_ID(func, bpf_lsm_mmap_file)
 BTF_ID(func, bpf_lsm_netlink_send)
 BTF_ID(func, bpf_lsm_path_notify)

---
base-commit: 0c559323bbaabee7346c12e74b497e283aaafef5
change-id: 20241005-lsm-key_free-b47445ee523d

Best regards,
-- 
Thomas Weißschuh <linux@...ssschuh.net>