linux-kernel - Re: [PATCH net-next] ip_tunnel: harden copying IP tunnel params to userspace

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Message-ID: <20240408074826.GA26556@kernel.org>
Date: Mon, 8 Apr 2024 08:48:26 +0100
From: Simon Horman <horms@...nel.org>
To: Alexander Lobakin <aleksander.lobakin@...el.com>
Cc: "David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	Dan Carpenter <dan.carpenter@...aro.org>,
	David Ahern <dsahern@...nel.org>,
	nex.sw.ncis.osdt.itp.upstreaming@...el.com, netdev@...r.kernel.org,
	intel-wired-lan@...ts.osuosl.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next] ip_tunnel: harden copying IP tunnel params to
 userspace

On Thu, Apr 04, 2024 at 06:03:02PM +0200, Alexander Lobakin wrote:
> Structures which are about to be copied to userspace shouldn't have
> uninitialized fields or paddings.
> memset() the whole &ip_tunnel_parm in ip_tunnel_parm_to_user() before
> filling it with the kernel data. The compilers will hopefully combine
> writes to it.
> 
> Fixes: 117aef12a7b1 ("ip_tunnel: use a separate struct to store tunnel params in the kernel")
> Reported-by: Dan Carpenter <dan.carpenter@...aro.org>
> Closes: https://lore.kernel.org/netdev/5f63dd25-de94-4ca3-84e6-14095953db13@moroto.mountain
> Signed-off-by: Alexander Lobakin <aleksander.lobakin@...el.com>

Reviewed-by: Simon Horman <horms@...nel.org>