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Date: Tue, 3 Mar 2020 10:55:14 +0100
From: Peter Zijlstra <peterz@...radead.org>
To: Kees Cook <keescook@...omium.org>
Cc: Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>,
Borislav Petkov <bp@...en8.de>,
Thomas Garnier <thgarnie@...omium.org>,
kernel-hardening@...ts.openwall.com, kristen@...ux.intel.com,
Herbert Xu <herbert@...dor.apana.org.au>,
"David S. Miller" <davem@...emloft.net>,
"H. Peter Anvin" <hpa@...or.com>, 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@...r.kernel.org,
linux-kernel@...r.kernel.org,
virtualization@...ts.linux-foundation.org, linux-pm@...r.kernel.org
Subject: Re: [PATCH v11 00/11] x86: PIE support to extend KASLR randomization
On Mon, Mar 02, 2020 at 09:02:15PM -0800, Kees Cook wrote:
> On Thu, Feb 27, 2020 at 04:00:45PM -0800, Thomas Garnier wrote:
> > Minor changes based on feedback and rebase from v10.
> >
> > Splitting the previous serie in two. This part contains assembly code
> > changes required for PIE but without any direct dependencies with the
> > rest of the patchset.
> >
> > Note: Using objtool to detect non-compliant PIE relocations is not yet
> > possible as this patchset only includes the simplest PIE changes.
> > Additional changes are needed in kvm, xen and percpu code.
> >
> > Changes:
> > - patch v11 (assembly);
> > - Fix comments on x86/entry/64.
> > - Remove KASLR PIE explanation on all commits.
> > - Add note on objtool not being possible at this stage of the patchset.
>
> This moves us closer to PIE in a clean first step. I think these patches
> look good to go, and unblock the work in kvm, xen, and percpu code. Can
> one of the x86 maintainers pick this series up?
But,... do we still need this in the light of that fine-grained kaslr
stuff?
What is the actual value of this PIE crud in the face of that?
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