linux-kernel - Re: [RFC] Warn the user when they could overflow mapcount

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Message-ID: <CA+DvKQKba0iU+tydbmGkAJsxCxazORDnuoe32sy-2nggyagUxQ@mail.gmail.com>
Date:   Thu, 8 Feb 2018 14:48:52 -0500
From:   Daniel Micay <danielmicay@...il.com>
To:     Matthew Wilcox <willy@...radead.org>
Cc:     Jann Horn <jannh@...gle.com>, linux-mm@...ck.org,
        Kernel Hardening <kernel-hardening@...ts.openwall.com>,
        kernel list <linux-kernel@...r.kernel.org>,
        "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
Subject: Re: [RFC] Warn the user when they could overflow mapcount

I guess it could saturate and then switch to tracking the count via an
object pointer -> count mapping with a global lock? Whatever the
solution is should probably be a generic one since it's a recurring
issue.