netdev - Re: [PATCH net v2] skbuff: Account for tail adjustment during pull operations

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Date:   Sat, 17 Dec 2022 05:30:17 +0000
From:   patchwork-bot+netdevbpf@...nel.org
To:     Subash Abhinov Kasiviswanathan <quic_subashab@...cinc.com>
Cc:     davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
        pabeni@...hat.com, shmulik@...anetworks.com, willemb@...gle.com,
        alexanderduyck@...com, netdev@...r.kernel.org,
        daniel@...earbox.net, quic_stranche@...cinc.com
Subject: Re: [PATCH net v2] skbuff: Account for tail adjustment during pull
 operations

Hello:

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

On Wed, 14 Dec 2022 23:11:58 -0700 you wrote:
> Extending the tail can have some unexpected side effects if a program uses
> a helper like BPF_FUNC_skb_pull_data to read partial content beyond the
> head skb headlen when all the skbs in the gso frag_list are linear with no
> head_frag -
> 
>   kernel BUG at net/core/skbuff.c:4219!
>   pc : skb_segment+0xcf4/0xd2c
>   lr : skb_segment+0x63c/0xd2c
>   Call trace:
>    skb_segment+0xcf4/0xd2c
>    __udp_gso_segment+0xa4/0x544
>    udp4_ufo_fragment+0x184/0x1c0
>    inet_gso_segment+0x16c/0x3a4
>    skb_mac_gso_segment+0xd4/0x1b0
>    __skb_gso_segment+0xcc/0x12c
>    udp_rcv_segment+0x54/0x16c
>    udp_queue_rcv_skb+0x78/0x144
>    udp_unicast_rcv_skb+0x8c/0xa4
>    __udp4_lib_rcv+0x490/0x68c
>    udp_rcv+0x20/0x30
>    ip_protocol_deliver_rcu+0x1b0/0x33c
>    ip_local_deliver+0xd8/0x1f0
>    ip_rcv+0x98/0x1a4
>    deliver_ptype_list_skb+0x98/0x1ec
>    __netif_receive_skb_core+0x978/0xc60
> 
> [...]

Here is the summary with links:
  - [net,v2] skbuff: Account for tail adjustment during pull operations
    https://git.kernel.org/netdev/net/c/2d7afdcbc9d3

You are awesome, thank you!
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