netdev - Re: [iproute2-next v3 3/3] devlink: add dry run attribute support to devlink flash

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Date:   Mon, 25 Jul 2022 14:13:14 -0700
From:   Stephen Hemminger <stephen@...workplumber.org>
To:     Jacob Keller <jacob.e.keller@...el.com>
Cc:     netdev@...r.kernel.org, Jonathan Corbet <corbet@....net>,
        Jiri Pirko <jiri@...dia.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Tony Nguyen <anthony.l.nguyen@...el.com>,
        David Ahern <dsahern@...nel.org>, linux-doc@...r.kernel.org
Subject: Re: [iproute2-next v3 3/3] devlink: add dry run attribute support
 to devlink flash

On Mon, 25 Jul 2022 13:56:50 -0700
Jacob Keller <jacob.e.keller@...el.com> wrote:

> To avoid potential issues, only allow the attribute to be added to
> commands when the kernel recognizes it. This is important because some
> commands do not perform strict validation. If we were to add the
> attribute without this check, an old kernel may silently accept the
> command and perform an update even when dry_run was requested.

Sigh. Looks like the old kernels are buggy. The workaround in userspace
is also likely to be source of bugs.