linux-kernel - Re: [PATCH net-next] modules: allow modprobe load regular elf binaries

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Message-ID: <CALCETrWFhTurv0gwxRcdLn4CD-1ySE=v4ZgvbsUYJqruZNMptQ@mail.gmail.com>
Date:   Thu, 22 Mar 2018 22:15:43 +0000
From:   Andy Lutomirski <luto@...nel.org>
To:     "Luis R. Rodriguez" <mcgrof@...nel.org>
Cc:     Alexei Starovoitov <ast@...com>, Jessica Yu <jeyu@...hat.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Mimi Zohar <zohar@...ux.vnet.ibm.com>,
        Djalal Harouni <tixxdz@...il.com>,
        David Miller <davem@...emloft.net>,
        Kees Cook <keescook@...omium.org>,
        Alexei Starovoitov <ast@...nel.org>,
        Al Viro <viro@...iv.linux.org.uk>,
        Daniel Borkmann <daniel@...earbox.net>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Network Development <netdev@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        kernel-team <kernel-team@...com>,
        Linux API <linux-api@...r.kernel.org>,
        Michal Hocko <mhocko@...nel.org>,
        Hannes Reinecke <hare@...e.com>, werner@...e.com
Subject: Re: [PATCH net-next] modules: allow modprobe load regular elf binaries

On Thu, Mar 22, 2018 at 8:54 PM, Luis R. Rodriguez <mcgrof@...nel.org> wrote:
> If we can ensure that these usermode modules don't take *any time at all* on
> their init *from the start*, it would be wonderful and we'd end up avoiding
> some really odd corner case issues later.
>

I don't see why this issue needs to exist at all for the new stuff.
After all, the new things aren't usermode modules per se.  They're
regular kernel code (modular or otherwise) that loads a usermode
helper.  All we need to do is to make sure that, if this is
distributed as a module, that it's init routine doesn't wait for a
long time, right?