linux-kernel - Re: [PATCH] fix fault_in_multipages_...() on architectures with no-op access

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Message-ID: <CA+55aFx7xv0SSCGpewS1WoxcKUiWQVN1XzdgBq1BgjJxe_U+0g@mail.gmail.com>
Date:   Tue, 20 Sep 2016 16:43:18 -0700
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     Al Viro <viro@...iv.linux.org.uk>
Cc:     Heiko Carstens <heiko.carstens@...ibm.com>,
        Martin Schwidefsky <schwidefsky@...ibm.com>,
        Jan Stancek <jstancek@...hat.com>,
        Arnd Bergmann <arnd@...db.de>, Greg Ungerer <gerg@...inux.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] fix fault_in_multipages_...() on architectures with no-op access_ok()

[ Sorry, AFK there for a while ]

On Tue, Sep 20, 2016 at 2:03 PM, Al Viro <viro@...iv.linux.org.uk> wrote:
>
> What proper mappings?  If you manage to mmap something at (void*)-PAGE_SIZE,
> you are very deep in trouble regardless.  We use IS_ERR() on userland
> pointers and any architecture where that would be possible would be confused
> as hell.

Ack, you've convinced me. Will apply the patch.

             Linus