Subject: Re: [PATCH net v5] bpf, net: Fix a potential race in do_sock_getsockopt()

From: [email-masked]
Date: Tue, 03 Sep 2024 20:10:30 +0000

Hello:

This patch was applied to netdev/net.git (main)
by Jakub Kicinski <[email-masked]>:

On Fri, 30 Aug 2024 16:25:17 +0800 you wrote:
> There's a potential race when `cgroup_bpf_enabled(CGROUP_GETSOCKOPT)` is
> false during the execution of `BPF_CGROUP_GETSOCKOPT_MAX_OPTLEN`, but
> becomes true when `BPF_CGROUP_RUN_PROG_GETSOCKOPT` is called.
> This inconsistency can lead to `BPF_CGROUP_RUN_PROG_GETSOCKOPT` receiving
> an "-EFAULT" from `__cgroup_bpf_run_filter_getsockopt(max_optlen=0)`.
> Scenario shown as below:
> 
> [...]

Here is the summary with links:
  - [net,v5] bpf, net: Fix a potential race in do_sock_getsockopt()
    https://git.kernel.org/netdev/net/c/33f339a1ba54

You are awesome, thank you!
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