netdev - Re: [PATCH net] net/packet: fix slab-out-of-bounds access in packet

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Date:   Tue, 15 Mar 2022 05:40:10 +0000
From:   patchwork-bot+netdevbpf@...nel.org
To:     Eric Dumazet <eric.dumazet@...il.com>
Cc:     davem@...emloft.net, kuba@...nel.org, netdev@...r.kernel.org,
        edumazet@...gle.com, syzkaller@...glegroups.com
Subject: Re: [PATCH net] net/packet: fix slab-out-of-bounds access in
 packet_recvmsg()

Hello:

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

On Sat, 12 Mar 2022 15:29:58 -0800 you wrote:
> From: Eric Dumazet <edumazet@...gle.com>
> 
> syzbot found that when an AF_PACKET socket is using PACKET_COPY_THRESH
> and mmap operations, tpacket_rcv() is queueing skbs with
> garbage in skb->cb[], triggering a too big copy [1]
> 
> Presumably, users of af_packet using mmap() already gets correct
> metadata from the mapped buffer, we can simply make sure
> to clear 12 bytes that might be copied to user space later.
> 
> [...]

Here is the summary with links:
  - [net] net/packet: fix slab-out-of-bounds access in packet_recvmsg()
    https://git.kernel.org/netdev/net/c/c700525fcc06

You are awesome, thank you!
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