linux-kernel - Re: [PATCH] bpftool: Fix undefined behavior caused by shifting into the sign bit

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Message-ID: <4a42a392-590d-4b90-a21d-df4290d86204@kernel.org>
Date: Sun, 8 Sep 2024 20:48:40 +0100
From: Quentin Monnet <qmo@...nel.org>
To: Kuan-Wei Chiu <visitorckw@...il.com>
Cc: ast@...nel.org, daniel@...earbox.net, andrii@...nel.org,
 martin.lau@...ux.dev, eddyz87@...il.com, song@...nel.org,
 yonghong.song@...ux.dev, john.fastabend@...il.com, kpsingh@...nel.org,
 sdf@...ichev.me, haoluo@...gle.com, jolsa@...nel.org,
 jserv@...s.ncku.edu.tw, bpf@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] bpftool: Fix undefined behavior caused by shifting into
 the sign bit

On 08/09/2024 15:00, Kuan-Wei Chiu wrote:
> Replace shifts of '1' with '1U' in bitwise operations within
> __show_dev_tc_bpf() to prevent undefined behavior caused by shifting
> into the sign bit of a signed integer. By using '1U', the operations
> are explicitly performed on unsigned integers, avoiding potential
> integer overflow or sign-related issues.
> 
> Signed-off-by: Kuan-Wei Chiu <visitorckw@...il.com>


Looks good, thank you.

Acked-by: Quentin Monnet <qmo@...nel.org>

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