linux-kernel - Re: [PATCH 0/3] use do_mount() instead of ksys

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Date:   Thu, 12 Dec 2019 18:37:13 +0000
From:   Al Viro <viro@...iv.linux.org.uk>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     Dominik Brodowski <linux@...inikbrodowski.net>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Rafael J . Wysocki" <rafael@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Ingo Molnar <mingo@...nel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 0/3] use do_mount() instead of ksys_mount()

On Thu, Dec 12, 2019 at 09:11:10AM -0800, Linus Torvalds wrote:
> On Thu, Dec 12, 2019 at 5:59 AM Dominik Brodowski
> <linux@...inikbrodowski.net> wrote:
> >
> > This small series replaces all in-kernel calls to the
> > userspace-focused wrapper ksys_mount() with calls to
> > the kernel-centric do_mount().
> 
> If you fix the pointless cast I pointed out, and put it in a git
> branch, I'll pull it.
> 
> In fact, just do both series in the same branch, they do conceptually
> the same thing, after all.

IMO it's not a good idea.  Exposing the guts of fs/namespace.c to
what's essentially a userland code that happens to run in kernel thread
is asking for trouble - we'd been there and it had been hell to untangle.