netdev - Re: [PATCH bpf-next] bpf: Add BPF-helper for accessing CLOCK

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:   Tue, 02 Aug 2022 09:06:44 +0200
From:   Kurt Kanzenbach <kurt@...utronix.de>
To:     Alexei Starovoitov <alexei.starovoitov@...il.com>,
        Jesper Dangaard Brouer <jbrouer@...hat.com>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Jesper Dangaard Brouer <brouer@...hat.com>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        John Fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...nel.org>,
        Joanne Koong <joannelkoong@...il.com>,
        Jiri Olsa <jolsa@...nel.org>,
        Dave Marchevsky <davemarchevsky@...com>,
        Lorenzo Bianconi <lorenzo@...nel.org>,
        Geliang Tang <geliang.tang@...e.com>,
        Jakub Sitnicki <jakub@...udflare.com>,
        Network Development <netdev@...r.kernel.org>,
        bpf <bpf@...r.kernel.org>
Subject: Re: [PATCH bpf-next] bpf: Add BPF-helper for accessing CLOCK_TAI

Hi Alexei,

On Tue Jun 07 2022, Alexei Starovoitov wrote:
> Anyway I guess new helper bpf_ktime_get_tai_ns() is ok, since
> it's so trivial, but selftest is necessary.

So, I did write a selftest [1] for testing bpf_ktime_get_tai_ns() and
verifying that the access to the clock works. It uses AF_XDP sockets and
timestamps the incoming packets. The timestamps are then validated in
user space.

Since AF_XDP related code is migrating from libbpf to libxdp, I'm
wondering if that sample fits into the kernel's selftests or not. What
kind of selftest are you looking for?

Thanks,
Kurt

[1] - https://github.com/shifty91/xdp-timestamping/tree/master/src

Download attachment "signature.asc" of type "application/pgp-signature" (862 bytes)