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Subject: Re: [PATCH net-next v5 1/2] drivers: net: prevent tun_build_skb() to
 exceed the packet size limit
From:   patchwork-bot+netdevbpf@kernel.org
Message-Id: <169146122144.9822.6352423513613934358.git-patchwork-notify@kernel.org>
Date:   Tue, 08 Aug 2023 02:20:21 +0000
References: <20230803185947.2379988-1-andrew.kanner@gmail.com>
In-Reply-To: <20230803185947.2379988-1-andrew.kanner@gmail.com>
To:     Andrew Kanner <andrew.kanner@gmail.com>
Cc:     davem@davemloft.net, edumazet@google.com, kuba@kernel.org,
        pabeni@redhat.com, jasowang@redhat.com, netdev@vger.kernel.org,
        hawk@kernel.org, jbrouer@redhat.com, dsahern@gmail.com,
        john.fastabend@gmail.com, linux-kernel@vger.kernel.org,
        linux-kernel-mentees@lists.linuxfoundation.org,
        syzbot+f817490f5bd20541b90a@syzkaller.appspotmail.com
Precedence: bulk

Hello:

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

On Thu,  3 Aug 2023 20:59:48 +0200 you wrote:
> Using the syzkaller repro with reduced packet size it was discovered
> that XDP_PACKET_HEADROOM is not checked in tun_can_build_skb(),
> although pad may be incremented in tun_build_skb(). This may end up
> with exceeding the PAGE_SIZE limit in tun_build_skb().
> 
> Jason Wang <jasowang@redhat.com> proposed to count XDP_PACKET_HEADROOM
> always (e.g. without rcu_access_pointer(tun->xdp_prog)) in
> tun_can_build_skb() since there's a window during which XDP program
> might be attached between tun_can_build_skb() and tun_build_skb().
> 
> [...]

Here is the summary with links:
  - [net-next,v5,1/2] drivers: net: prevent tun_build_skb() to exceed the packet size limit
    https://git.kernel.org/netdev/net/c/59eeb2329405
  - [net-next,v5,2/2] net: core: remove unnecessary frame_sz check in bpf_xdp_adjust_tail()
    https://git.kernel.org/netdev/net/c/d14eea09edf4

You are awesome, thank you!
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