linux-kernel - Re: [PATCH] libbpf: Fix integer overflow issue

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Message-ID: <b7c4b77e22bd8005ad5758706ddefe878f949d94.camel@gmail.com>
Date: Tue, 08 Oct 2024 02:48:54 -0700
From: Eduard Zingerman <eddyz87@...il.com>
To: Andrii Nakryiko <andrii.nakryiko@...il.com>
Cc: I Hsin Cheng <richard120310@...il.com>, martin.lau@...ux.dev, 
	ast@...nel.org, daniel@...earbox.net, andrii@...nel.org, song@...nel.org, 
	yonghong.song@...ux.dev, john.fastabend@...il.com, kpsingh@...nel.org, 
	sdf@...ichev.me, haoluo@...gle.com, jolsa@...nel.org, bpf@...r.kernel.org, 
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] libbpf: Fix integer overflow issue

On Mon, 2024-10-07 at 20:42 -0700, Andrii Nakryiko wrote:

[...]

> Not sure what Eduard is suggesting here, tbh. But I think if this
> actually can happen that we have a non-loaded BPF program in one of
> those struct_ops slots, then let's add a test demonstrating that.

Given the call chain listed in a previous email I think that such
situation is not possible (modulo obj->gen_loader, which I know
nothing about).

Thus I suggest to add a pr_warn() and return -EINVAL or something like
that here.

> Worst case of what can happen right now is the kernel rejecting
> struct_ops loading due to -22 as a program FD.
> 
> pw-bot: cr

[...]