Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67;
MIME-Version: 1.0
References: <cover.thread-4f3684.your-ad-here.call-01526696764-ext-9375@work.hours>
 <patch-1.thread-4f3684.git-4f3684ca2aad.your-ad-here.call-01526696764-ext-9375@work.hours>
 <CA+55aFxJb9P2TMCc2Pao-uXcVACK-CTBHmzObAQu=rvs87itvw@mail.gmail.com>
 <CA+55aFwxEiiAC+dMMVqQ4igqb7rmn23Bq=BM8fqU=MFRWF1JSw@mail.gmail.com>
 <20180519034338.GV30522@ZenIV.linux.org.uk> <CA+55aFyHLFnGv8yFJs7-vGVe6tDeDAbSJ6=09iTqsegRZN_nGw@mail.gmail.com>
In-Reply-To: <CA+55aFyHLFnGv8yFJs7-vGVe6tDeDAbSJ6=09iTqsegRZN_nGw@mail.gmail.com>
From:   Linus Torvalds <torvalds@linux-foundation.org>
Date:   Fri, 18 May 2018 21:16:16 -0700
Message-ID: <CA+55aFzaPA04abVKKL8_CEpj960sE731-BttF5L733U1A-kd4Q@mail.gmail.com>
Subject: Re: [PATCH] procfs: fix mmap() for /proc/vmcore
To:     Al Viro <viro@zeniv.linux.org.uk>
Cc:     gor@linux.ibm.com, Andrew Morton <akpm@linux-foundation.org>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        Heiko Carstens <heiko.carstens@de.ibm.com>
Content-Type: text/plain; charset="UTF-8"
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

On Fri, May 18, 2018 at 9:12 PM Linus Torvalds <
torvalds@linux-foundation.org> wrote:

> (So we'd still have a "sb_maxbytes" that filesystems would fill in, but it
> would only be used as a "fill in inode value for regular files for this
> superblock").

Actually, maybe we could just make rw_verify_area() use the new
file_mmap_size_max() function.

We'd just remove the "mmap" part of the name, and have all IO (and all
mmap) use that limit.

That doesn't sound like a horrible idea to try for 4.18. Hmm?

               Linus