netdev - Re: [PATCH bpf v2] xsk: fix xsk_diag use-after-free error during socket cleanup

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Date: Thu, 31 Aug 2023 11:30:22 +0000
From: patchwork-bot+netdevbpf@...nel.org
To: Magnus Karlsson <magnus.karlsson@...il.com>
Cc: magnus.karlsson@...el.com, bjorn@...nel.org, ast@...nel.org,
 daniel@...earbox.net, netdev@...r.kernel.org, maciej.fijalkowski@...el.com,
 jonathan.lemon@...il.com, bpf@...r.kernel.org,
 syzbot+822d1359297e2694f873@...kaller.appspotmail.com
Subject: Re: [PATCH bpf v2] xsk: fix xsk_diag use-after-free error during socket
 cleanup

Hello:

This patch was applied to bpf/bpf.git (master)
by Daniel Borkmann <daniel@...earbox.net>:

On Thu, 31 Aug 2023 12:01:17 +0200 you wrote:
> From: Magnus Karlsson <magnus.karlsson@...el.com>
> 
> Fix a use-after-free error that is possible if the xsk_diag interface
> is used after the socket has been unbound from the device. This can
> happen either due to the socket being closed or the device
> disappearing. In the early days of AF_XDP, the way we tested that a
> socket was not bound to a device was to simply check if the netdevice
> pointer in the xsk socket structure was NULL. Later, a better system
> was introduced by having an explicit state variable in the xsk socket
> struct. For example, the state of a socket that is on the way to being
> closed and has been unbound from the device is XSK_UNBOUND.
> 
> [...]

Here is the summary with links:
  - [bpf,v2] xsk: fix xsk_diag use-after-free error during socket cleanup
    https://git.kernel.org/bpf/bpf/c/3e019d8a05a3

You are awesome, thank you!
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