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From: patchwork-bot+netdevbpf@kernel.org
To: Bingquan Chen <patzilla007@gmail.com>
Cc: willemdebruijn.kernel@gmail.com, gregkh@linuxfoundation.org,
	stephen@networkplumber.org, security@kernel.org,
	davem@davemloft.net, kuba@kernel.org, edumazet@google.com,
	netdev@vger.kernel.org
Subject: Re: [PATCH net] net/packet: fix TOCTOU race on mmap'd vnet_hdr in tpacket_snd()
Date: Thu, 23 Apr 2026 03:40:09 +0000	[thread overview]
Message-ID: <177691560954.4145271.18164483820935848818.git-patchwork-notify@kernel.org> (raw)
In-Reply-To: <20260418112006.78823-1-patzilla007@gmail.com>

Hello:

This patch was applied to netdev/net.git (main)
by Jakub Kicinski <kuba@kernel.org>:

On Sat, 18 Apr 2026 19:20:06 +0800 you wrote:
> In tpacket_snd(), when PACKET_VNET_HDR is enabled, vnet_hdr points
> directly into the mmap'd TX ring buffer shared with userspace. The
> kernel validates the header via __packet_snd_vnet_parse() but then
> re-reads all fields later in virtio_net_hdr_to_skb(). A concurrent
> userspace thread can modify the vnet_hdr fields between validation
> and use, bypassing all safety checks.
> 
> [...]

Here is the summary with links:
  - [net] net/packet: fix TOCTOU race on mmap'd vnet_hdr in tpacket_snd()
    https://git.kernel.org/netdev/net/c/2c054e17d9d4

You are awesome, thank you!
-- 
Deet-doot-dot, I am a bot.
https://korg.docs.kernel.org/patchwork/pwbot.html



  parent reply	other threads:[~2026-04-23  3:40 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <2026041858-estimator-shower-0f16@gregkh>
2026-04-18 11:20 ` [PATCH net] net/packet: fix TOCTOU race on mmap'd vnet_hdr in tpacket_snd() Bingquan Chen
2026-04-18 20:17   ` Willem de Bruijn
2026-04-23  3:40   ` patchwork-bot+netdevbpf [this message]
2026-04-17  8:15 [PATCH] " Willem de Bruijn
2026-04-17 13:36 ` [PATCH net] " Zero Mark
2026-04-17 20:01   ` Willem de Bruijn

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