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Date:   Tue, 28 May 2019 11:24:40 +0200
From:   Daniel Borkmann <>
To:     Yonghong Song <>,,
Cc:     Alexei Starovoitov <>,
Subject: Re: [PATCH bpf-next] bpf: check signal validity in nmi for
 bpf_send_signal() helper

On 05/25/2019 08:57 PM, Yonghong Song wrote:
> Commit 8b401f9ed244 ("bpf: implement bpf_send_signal() helper")
> introduced bpf_send_signal() helper. If the context is nmi,
> the sending signal work needs to be deferred to irq_work.
> If the signal is invalid, the error will appear in irq_work
> and it won't be propagated to user.
> This patch did an early check in the helper itself to
> notify user invalid signal, as suggested by Daniel.
> Signed-off-by: Yonghong Song <>

Applied, thanks!

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