linux-kernel - Re: [PATCH bpf-next 2/2] bpf: Expose bpf_d

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Message-ID: <63870297-fffe-f01e-9747-219b63c5d7f4@fb.com>
Date:   Thu, 12 Nov 2020 19:18:21 -0800
From:   Yonghong Song <yhs@...com>
To:     KP Singh <kpsingh@...omium.org>, <linux-kernel@...r.kernel.org>,
        <bpf@...r.kernel.org>
CC:     Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Jann Horn <jannh@...gle.com>,
        Hao Luo <haoluo@...gle.com>,
        Florent Revest <revest@...omium.org>,
        Brendan Jackman <jackmanb@...omium.org>
Subject: Re: [PATCH bpf-next 2/2] bpf: Expose bpf_d_path helper to sleepable
 LSM hooks



On 11/12/20 9:19 AM, KP Singh wrote:
> From: KP Singh <kpsingh@...gle.com>
> 
> Sleepable hooks are never called from an NMI/interrupt context, so it is
> safe to use the bpf_d_path helper in LSM programs attaching to these
> hooks.
> 
> The helper is not restricted to sleepable programs and merely uses the
> list of sleeable hooks as the initial subset of LSM hooks where it can

sleeable => sleepable

probably not need to resend if no other major changes. The maintainer
can just fix it up before merging.

> be used.
> 
> Signed-off-by: KP Singh <kpsingh@...gle.com>

Acked-by: Yonghong Song <yhs@...com>