linux-kernel - Re: [PATCH] net: benet: use snprintf instead sprintf and IFNAMSIZ instead hardcoded constant.

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Message-ID: <20221004173046.5ec6d3ca@kernel.org>
Date:   Tue, 4 Oct 2022 17:30:46 -0700
From:   Jakub Kicinski <kuba@...nel.org>
To:     Stephen Hemminger <stephen@...workplumber.org>,
        Peter Kosyh <pkosyh@...dex.ru>
Cc:     Ajit Khaparde <ajit.khaparde@...adcom.com>,
        Sriharsha Basavapatna <sriharsha.basavapatna@...adcom.com>,
        Somnath Kotur <somnath.kotur@...adcom.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Paolo Abeni <pabeni@...hat.com>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, lvc-project@...uxtesting.org
Subject: Re: [PATCH] net: benet: use snprintf instead sprintf and IFNAMSIZ
 instead hardcoded constant.

On Tue, 4 Oct 2022 08:29:36 -0700 Stephen Hemminger wrote:
> On Tue,  4 Oct 2022 12:50:34 +0300
> Peter Kosyh <pkosyh@...dex.ru> wrote:
> 
> > printf to array 'eqo->desc' of size 32 may cause buffer overflow when
> > using non-standard IFNAMSIZ.
> > 
> > Found by Linux Verification Center (linuxtesting.org) with SVACE.
> > 
> > Signed-off-by: Peter Kosyh <pkosyh@...dex.ru>  
> 
> NACK
> Non-standard IFNAMSIZ will break uapi and many things.
> I see no reason for kernel or tools like iproute2 to support or
> fix those related bugs.

I think the commit message is missing the point, but the warning
may be legit.

Pater please read the requirements for sending patches based on
automated checkers:

  Documentation/process/researcher-guidelines.rst