Re: [PATCH] BPF: Disable on PREEMPT_RT

David Miller
2019-10-17T17:26:04Z

From: Daniel Borkmann <daniel@iogearbox.net>
Date: Thu, 17 Oct 2019 16:53:58 +0200

> On Thu, Oct 17, 2019 at 11:05:01AM +0200, Sebastian Andrzej Siewior wrote:
>> Disable BPF on PREEMPT_RT because
>> - it allocates and frees memory in atomic context
>> - it uses up_read_non_owner()
>> - BPF_PROG_RUN() expects to be invoked in non-preemptible context
>
> For the latter you'd also need to disable seccomp-BPF and everything
> cBPF related as they are /all/ invoked via BPF_PROG_RUN() ...

+1 Right, we can't do this, no way.