linux-kernel - Re: [PATCH] bpf, lsm: Fix getlsmprop hooks BTF IDs

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Message-ID: <CAADnVQ++-VwPnem-xY+Urec0=zi71s-Pmzox+TXYgaVpshHtEA@mail.gmail.com>
Date: Sun, 24 Nov 2024 15:45:04 -0800
From: Alexei Starovoitov <alexei.starovoitov@...il.com>
To: Thomas Weißschuh <linux@...ssschuh.net>
Cc: 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>, 
	Paul Moore <paul@...l-moore.com>, Casey Schaufler <casey@...aufler-ca.com>, bpf <bpf@...r.kernel.org>, 
	LKML <linux-kernel@...r.kernel.org>, audit@...r.kernel.org, 
	selinux@...r.kernel.org
Subject: Re: [PATCH] bpf, lsm: Fix getlsmprop hooks BTF IDs

On Sat, Nov 23, 2024 at 2:19 AM Thomas Weißschuh <linux@...ssschuh.net> wrote:
>
> The hooks got renamed, adapt the BTF IDs.
> Fixes the following build warning:
>
>   BTFIDS  vmlinux
> WARN: resolve_btfids: unresolved symbol bpf_lsm_task_getsecid_obj
> WARN: resolve_btfids: unresolved symbol bpf_lsm_current_getsecid_subj
>
> Fixes: 37f670aacd48 ("lsm: use lsm_prop in security_current_getsecid")
> Signed-off-by: Thomas Weißschuh <linux@...ssschuh.net>
> ---
>  kernel/bpf/bpf_lsm.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/kernel/bpf/bpf_lsm.c b/kernel/bpf/bpf_lsm.c
> index 3bc61628ab251e05d7837eb27dabc3b62bcc4783..5be76572ab2e8a0c6e18a81f9e4c14812a11aad2 100644
> --- a/kernel/bpf/bpf_lsm.c
> +++ b/kernel/bpf/bpf_lsm.c
> @@ -375,8 +375,8 @@ BTF_ID(func, bpf_lsm_socket_socketpair)
>
>  BTF_ID(func, bpf_lsm_syslog)
>  BTF_ID(func, bpf_lsm_task_alloc)
> -BTF_ID(func, bpf_lsm_current_getsecid_subj)
> -BTF_ID(func, bpf_lsm_task_getsecid_obj)
> +BTF_ID(func, bpf_lsm_current_getlsmprop_subj)
> +BTF_ID(func, bpf_lsm_task_getlsmprop_obj)

Maybe we can remove these two instead?
I couldn't come up with a reason for bpf_lsm to attach to these two.