netdev - Re: [PATCH] mlx4: use snprintf() instead of sprintf() for safety

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <Y32k/ZGQhNR9iM2F@x130.lan>
Date:   Tue, 22 Nov 2022 20:43:41 -0800
From:   Saeed Mahameed <saeed@...nel.org>
To:     Jakub Kicinski <kuba@...nel.org>
Cc:     Leon Romanovsky <leon@...nel.org>, Peter Kosyh <pkosyh@...dex.ru>,
        Tariq Toukan <tariqt@...dia.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Paolo Abeni <pabeni@...hat.com>, netdev@...r.kernel.org,
        linux-rdma@...r.kernel.org, linux-kernel@...r.kernel.org,
        lvc-project@...uxtesting.org
Subject: Re: [PATCH] mlx4: use snprintf() instead of sprintf() for safety

On 22 Nov 12:12, Jakub Kicinski wrote:
>On Tue, 22 Nov 2022 16:48:15 +0200 Leon Romanovsky wrote:
>> On Tue, Nov 22, 2022 at 04:04:53PM +0300, Peter Kosyh wrote:
>> > Use snprintf() to avoid the potential buffer overflow. Although in the
>> > current code this is hardly possible, the safety is unclean.
>>
>> Let's fix the tools instead. The kernel code is correct.
>
>I'm guessing the code is correct because port can't be a high value?
>Otherwise, if I'm counting right, large enough port representation
>(e.g. 99999999) could overflow the string. If that's the case - how
>would they "fix the tool" to know the port is always a single digit?

+1 

FWIW,

Reviewed-by: Saeed Mahameed <saeed@...nel.org>