netdev - Re: [PATCH net-next v2] tun: replace strcpy with strscpy for ifr

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Message-ID: <689c8dbe91cf3_125e46294ae@willemb.c.googlers.com.notmuch>
Date: Wed, 13 Aug 2025 09:06:06 -0400
From: Willem de Bruijn <willemdebruijn.kernel@...il.com>
To: Miguel García <miguelgarciaroman8@...il.com>, 
 netdev@...r.kernel.org
Cc: linux-kernel@...r.kernel.org, 
 willemdebruijn.kernel@...il.com, 
 jasowang@...hat.com, 
 andrew+netdev@...n.ch, 
 davem@...emloft.net, 
 edumazet@...gle.com, 
 kuba@...nel.org, 
 pabeni@...hat.com, 
 skhan@...uxfoundation.org, 
 Miguel García <miguelgarciaroman8@...il.com>
Subject: Re: [PATCH net-next v2] tun: replace strcpy with strscpy for ifr_name

Miguel García wrote:
> Replace the strcpy() calls that copy the device name into ifr->ifr_name
> with strscpy() to avoid potential overflows and guarantee NULL termination.
> 
> Destination is ifr->ifr_name (size IFNAMSIZ).
> 
> Tested in QEMU (BusyBox rootfs):
>  - Created TUN devices via TUNSETIFF helper
>  - Set addresses and brought links up
>  - Verified long interface names are safely truncated (IFNAMSIZ-1)
> 
> Signed-off-by: Miguel García <miguelgarciaroman8@...il.com>

Reviewed-by: Willem de Bruijn <willemb@...gle.com>