Re: [PATCH bpf-next v2 4/4] bpf, btf: Enforce destructor kfunc type with CFI

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Subject: Re: [PATCH bpf-next v2 4/4] bpf, btf: Enforce destructor kfunc type with CFI
From: Yonghong Song <yonghong.song@xxxxxxxxx>
Date: Fri, 25 Jul 2025 16:37:42 -0700
Cc: Vadim Fedorenko <vadim.fedorenko@xxxxxxxxx>, Alexei Starovoitov <ast@xxxxxxxxxx>, Daniel Borkmann <daniel@xxxxxxxxxxxxx>, Andrii Nakryiko <andrii@xxxxxxxxxx>, Martin KaFai Lau <martin.lau@xxxxxxxxx>, Eduard Zingerman <eddyz87@xxxxxxxxx>, Song Liu <song@xxxxxxxxxx>, John Fastabend <john.fastabend@xxxxxxxxx>, KP Singh <kpsingh@xxxxxxxxxx>, Stanislav Fomichev <sdf@xxxxxxxxxxx>, Hao Luo <haoluo@xxxxxxxxxx>, Jiri Olsa <jolsa@xxxxxxxxxx>, Jamal Hadi Salim <jhs@xxxxxxxxxxxx>, Cong Wang <xiyou.wangcong@xxxxxxxxx>, Jiri Pirko <jiri@xxxxxxxxxxx>, netdev@xxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx
In-reply-to: <20250725214401.1475224-10-samitolvanen@google.com>



On 7/25/25 2:44 PM, Sami Tolvanen wrote:

Ensure that registered destructor kfuncs have the same type
as btf_dtor_kfunc_t to avoid a kernel panic on systems with
CONFIG_CFI_CLANG enabled.

Signed-off-by: Sami Tolvanen <samitolvanen@xxxxxxxxxx>


Acked-by: Yonghong Song <yonghong.song@xxxxxxxxx>

References:
- [PATCH bpf-next v2 0/4] Use correct destructor kfunc types
  - From: Sami Tolvanen
- [PATCH bpf-next v2 4/4] bpf, btf: Enforce destructor kfunc type with CFI
  - From: Sami Tolvanen

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