netdev - Re: [PATCH bpf] bpf, sockmap: Prevent lock inversion deadlock in map delete elem

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Date: Tue, 02 Apr 2024 14:40:27 +0000
From: patchwork-bot+netdevbpf@...nel.org
To: Jakub Sitnicki <jakub@...udflare.com>
Cc: bpf@...r.kernel.org, netdev@...r.kernel.org, ast@...nel.org,
 daniel@...earbox.net, andrii@...nel.org, kernel-team@...udflare.com,
 xrivendell7@...il.com, samsun1006219@...il.com,
 syzbot+bc922f476bd65abbd466@...kaller.appspotmail.com,
 syzbot+d4066896495db380182e@...kaller.appspotmail.com,
 john.fastabend@...il.com, eadavis@...com, shung-hsi.yu@...e.com
Subject: Re: [PATCH bpf] bpf,
 sockmap: Prevent lock inversion deadlock in map delete elem

Hello:

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

On Tue,  2 Apr 2024 12:46:21 +0200 you wrote:
> syzkaller started using corpuses where a BPF tracing program deletes
> elements from a sockmap/sockhash map. Because BPF tracing programs can be
> invoked from any interrupt context, locks taken during a map_delete_elem
> operation must be hardirq-safe. Otherwise a deadlock due to lock inversion
> is possible, as reported by lockdep:
> 
>        CPU0                    CPU1
> 
> [...]

Here is the summary with links:
  - [bpf] bpf, sockmap: Prevent lock inversion deadlock in map delete elem
    https://git.kernel.org/bpf/bpf/c/ff9105993240

You are awesome, thank you!
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