linux-kernel - Re: [PATCH v11 00/11] x86: PIE support to extend KASLR randomization

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Message-ID: <627fe5d2-e6c3-4eff-1a58-14e17dc04ac5@zytor.com>
Date:   Wed, 4 Mar 2020 11:22:04 -0800
From:   "H. Peter Anvin" <hpa@...or.com>
To:     Thomas Garnier <thgarnie@...omium.org>
Cc:     Kees Cook <keescook@...omium.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Kristen Carlson Accardi <kristen@...ux.intel.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Kernel Hardening <kernel-hardening@...ts.openwall.com>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        "David S. Miller" <davem@...emloft.net>,
        the arch/x86 maintainers <x86@...nel.org>,
        Andy Lutomirski <luto@...nel.org>,
        Juergen Gross <jgross@...e.com>,
        Thomas Hellstrom <thellstrom@...are.com>,
        "VMware, Inc." <pv-drivers@...are.com>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Len Brown <len.brown@...el.com>, Pavel Machek <pavel@....cz>,
        Rasmus Villemoes <linux@...musvillemoes.dk>,
        Miguel Ojeda <miguel.ojeda.sandonis@...il.com>,
        Will Deacon <will@...nel.org>,
        Ard Biesheuvel <ardb@...nel.org>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Jiri Slaby <jslaby@...e.cz>,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Cao jin <caoj.fnst@...fujitsu.com>,
        Allison Randal <allison@...utok.net>,
        Linux Crypto Mailing List <linux-crypto@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        virtualization@...ts.linux-foundation.org,
        Linux PM list <linux-pm@...r.kernel.org>
Subject: Re: [PATCH v11 00/11] x86: PIE support to extend KASLR randomization

On 2020-03-04 11:19, Thomas Garnier wrote:
>>
>> The huge memory model, required for arbitrary placement, has a very
>> significant performance impact.
> 
> I assume you mean mcmodel=large, it doesn't use it. It uses -fPIE and
> removes -mcmodel=kernel. It favors relative references whenever
> possible.
> 

I know... this was in reference to a comment of Kees'.

	-hpa