linux-kernel - Re: [PATCH] binfmt_flat: make load_flat_shared

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Message-ID: <CAK8P3a0zj126XSGjMbiDJDkY8sF+6JNWH0VsJEUAga6OGHV0vg@mail.gmail.com>
Date:   Wed, 29 May 2019 15:41:31 +0200
From:   Arnd Bergmann <arnd@...db.de>
To:     Greg Ungerer <gregungerer00@...il.com>
Cc:     Jann Horn <jannh@...gle.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        linux-fsdevel <linux-fsdevel@...r.kernel.org>,
        kernel list <linux-kernel@...r.kernel.org>,
        Kees Cook <keescook@...omium.org>,
        Nicolas Pitre <nicolas.pitre@...aro.org>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        "Linux/m68k" <linux-m68k@...r.kernel.org>,
        Russell King <linux@...linux.org.uk>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Sergei Poselenov <sposelenov@...raft.com>
Subject: Re: [PATCH] binfmt_flat: make load_flat_shared_library() work

On Wed, May 29, 2019 at 2:29 PM Greg Ungerer <gregungerer00@...il.com> wrote:
> On 29/5/19 10:05 pm, Arnd Bergmann wrote:
> > On Tue, May 28, 2019 at 12:56 PM Greg Ungerer <gerg@...ux-m68k.org> wrote:
> >> On 27/5/19 11:38 pm, Jann Horn wrote:
> >>> On Sat, May 25, 2019 at 11:43 PM Andrew Morton
> >>> <akpm@...ux-foundation.org> wrote:
> >>> Maybe... but I didn't want to rip it out without having one of the
> >>> maintainers confirm that this really isn't likely to be used anymore.
> >>
> >> I have not used shared libraries on m68k non-mmu setups for
> >> a very long time. At least 10 years I would think.
> >
> > I think Emcraft have a significant customer base running ARM NOMMU
> > Linux, I wonder whether they would have run into this (adding
> > Sergei to Cc).
> > My suspicion is that they use only binfmt-elf-fdpic, not binfmt-flat.
> >
> > The only architectures I see that enable binfmt-flat are sh, xtensa
> > and h8300, but only arch/sh uses CONFIG_BINFMT_SHARED_FLAT
>
> m68k uses enables it too. It is the only binary format supported
> when running no-mmu on m68k. (You can use it with MMU enabled too
> if you really want too).

My mistake, I meant to write 'the only architectures /other than m68k/",
which you had already mentioned above.

    Arnd