Re: [PATCH v3 1/2] bpf: Reject variable offset alu on PTR_TO_FLOW_KEYS

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Subject: Re: [PATCH v3 1/2] bpf: Reject variable offset alu on PTR_TO_FLOW_KEYS
From: Alexei Starovoitov <alexei.starovoitov@xxxxxxxxx>
Date: Fri, 12 Jan 2024 09:56:50 -0800
Cc: bpf <bpf@xxxxxxxxxxxxxxx>, Willem de Bruijn <willemb@xxxxxxxxxx>, Alexei Starovoitov <ast@xxxxxxxxxx>, Andrii Nakryiko <andrii@xxxxxxxxxx>, Daniel Borkmann <daniel@xxxxxxxxxxxxx>, Eddy Z <eddyz87@xxxxxxxxx>, LKML <linux-kernel@xxxxxxxxxxxxxxx>
In-reply-to: <20240112152011.6264-1-sunhao.th@gmail.com>

On Fri, Jan 12, 2024 at 7:20 AM Hao Sun <sunhao.th@xxxxxxxxx> wrote:
>
> For PTR_TO_FLOW_KEYS, check_flow_keys_access() only uses fixed off
> for validation. However, variable offset ptr alu is not prohibited
> for this ptr kind. So the variable offset is not checked.

Why resend v3?
What changed from v2?

Follow-Ups:
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  - From: Hao Sun

References:
- [PATCH v3 1/2] bpf: Reject variable offset alu on PTR_TO_FLOW_KEYS
  - From: Hao Sun

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