linux-kernel - Re: [PATCHv1, RFC 0/8] Boot-time switching between 4- and 5-level paging

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Message-ID: <40d58ba7-277c-6f4e-a4d7-15425d675dbf@intel.com>
Date:   Fri, 26 May 2017 12:23:18 -0700
From:   Dave Hansen <dave.hansen@...el.com>
To:     hpa@...or.com, Linus Torvalds <torvalds@...ux-foundation.org>,
        "Kirill A. Shutemov" <kirill@...temov.name>
Cc:     "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        the arch/x86 maintainers <x86@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        Andi Kleen <ak@...ux.intel.com>,
        Andy Lutomirski <luto@...capital.net>,
        "linux-arch@...r.kernel.org" <linux-arch@...r.kernel.org>,
        linux-mm <linux-mm@...ck.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCHv1, RFC 0/8] Boot-time switching between 4- and 5-level
 paging

On 05/26/2017 11:24 AM, hpa@...or.com wrote:
> The only case where that even has any utility is for an application
> to want more than 128 TiB address space on a machine with no more
> than 64 TiB of RAM.  It is kind of a narrow use case, I think.

Doesn't more address space increase the effectiveness of ASLR?  I
thought KASLR, especially, was limited in its effectiveness because of a
lack of address space.