netdev - Re: [PATCH net-next] af_packet: avoid a false positive warning in packet

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Message-ID: <66115733b397a_16bd4c29423@willemb.c.googlers.com.notmuch>
Date: Sat, 06 Apr 2024 10:07:47 -0400
From: Willem de Bruijn <willemdebruijn.kernel@...il.com>
To: Eric Dumazet <edumazet@...gle.com>, 
 "David S . Miller" <davem@...emloft.net>, 
 Jakub Kicinski <kuba@...nel.org>, 
 Paolo Abeni <pabeni@...hat.com>
Cc: netdev@...r.kernel.org, 
 eric.dumazet@...il.com, 
 Eric Dumazet <edumazet@...gle.com>, 
 syzbot <syzkaller@...glegroups.com>, 
 Kees Cook <keescook@...omium.org>, 
 Willem de Bruijn <willemdebruijn.kernel@...il.com>
Subject: Re: [PATCH net-next] af_packet: avoid a false positive warning in
 packet_setsockopt()

Eric Dumazet wrote:
> Although the code is correct, the following line
> 
> 	copy_from_sockptr(&req_u.req, optval, len));
> 
> triggers this warning :
> 
> memcpy: detected field-spanning write (size 28) of single field "dst" at include/linux/sockptr.h:49 (size 16)
> 
> Refactor the code to be more explicit.
> 
> Reported-by: syzbot <syzkaller@...glegroups.com>
> Signed-off-by: Eric Dumazet <edumazet@...gle.com>
> Cc: Kees Cook <keescook@...omium.org>
> Cc: Willem de Bruijn <willemdebruijn.kernel@...il.com>

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