linux-kernel - Re: [PATCH net] net: prevent pulling SKB_GSO

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Date: Mon, 29 Apr 2024 06:42:09 -0700
From: Jakub Kicinski <kuba@...nel.org>
To: <shiming.cheng@...iatek.com>
Cc: <willemdebruijn.kernel@...il.com>, <edumazet@...gle.com>,
 <davem@...emloft.net>, <pabeni@...hat.com>, <matthias.bgg@...il.com>,
 <linux-kernel@...r.kernel.org>, <netdev@...r.kernel.org>, Lena Wang
 <lena.wang@...iatek.com>
Subject: Re: [PATCH net] net: prevent pulling SKB_GSO_FRAGLIST skb

On Sun, 28 Apr 2024 22:29:13 +0800 shiming.cheng@...iatek.com wrote:
> From: Shiming Cheng <shiming.cheng@...iatek.com>
> 
> BPF or TC callers may pull in a length longer than skb_headlen()
> for a SKB_GSO_FRAGLIST skb. The data in fraglist will be pulled
> into the linear space. However it destroys the skb's structure
> and may result in an invalid segmentation or kernel exception.
> 
> So we should add protection to stop the operation and return
> error to remind callers.

One of the fixes you posted breaks the

  tools/testing/selftests/net/udpgro_fwd.sh

selftest. Please investigate, and either adjust the test or the fix.