linux-kernel - Re: [PATCH] net: add net namespace inode for all net

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]

Message-ID: <CAADnVQJe7GQjYvdBYvG3opeAdaY2EY2vtRafSp0zZ+Pe=Nnsdg@mail.gmail.com>
Date:   Tue, 9 Mar 2021 12:39:59 -0800
From:   Alexei Starovoitov <alexei.starovoitov@...il.com>
To:     Steven Rostedt <rostedt@...dmis.org>
Cc:     David Ahern <dsahern@...il.com>,
        Tony Lu <tonylu@...ux.alibaba.com>,
        "David S. Miller" <davem@...emloft.net>,
        Ingo Molnar <mingo@...hat.com>,
        Network Development <netdev@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] net: add net namespace inode for all net_dev events

On Tue, Mar 9, 2021 at 12:37 PM Steven Rostedt <rostedt@...dmis.org> wrote:
>
> The size of the fields and order changes all the time in various events. I
> recommend doing so *all the time*. If you upgrade a kernel, then all the bpf
> programs you have for that kernel should also be updated. You can't rely on
> fields being the same, size or order. The best you can do is expect the
> field to continue to exist, and that's not even a guarantee.

+1. Tracing bpf progs already do that.
Old style tracing progs do it based on the kernel version.
New style is using CO-RE.