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Message-ID: <20190307202521.GI26566@zn.tnic>
Date: Thu, 7 Mar 2019 21:25:21 +0100
From: Borislav Petkov <bp@...en8.de>
To: Andy Lutomirski <luto@...nel.org>
Cc: "H. Peter Anvin" <hpa@...or.com>, Nadav Amit <nadav.amit@...il.com>,
Rick Edgecombe <rick.p.edgecombe@...el.com>,
Ingo Molnar <mingo@...hat.com>, LKML <linux-kernel@...r.kernel.org>,
X86 ML <x86@...nel.org>, Thomas Gleixner <tglx@...utronix.de>,
Dave Hansen <dave.hansen@...ux.intel.com>,
Peter Zijlstra <peterz@...radead.org>,
Damian Tometzki <linux_dti@...oud.com>,
linux-integrity <linux-integrity@...r.kernel.org>,
LSM List <linux-security-module@...r.kernel.org>,
Andrew Morton <akpm@...ux-foundation.org>,
Kernel Hardening <kernel-hardening@...ts.openwall.com>,
Linux-MM <linux-mm@...ck.org>, Will Deacon <will.deacon@....com>,
Ard Biesheuvel <ard.biesheuvel@...aro.org>,
Kristen Carlson Accardi <kristen@...ux.intel.com>,
"Dock, Deneen T" <deneen.t.dock@...el.com>,
Kees Cook <keescook@...omium.org>,
Dave Hansen <dave.hansen@...el.com>,
Masami Hiramatsu <mhiramat@...nel.org>
Subject: Re: [PATCH v2 10/20] x86: avoid W^X being broken during modules
loading
On Thu, Mar 07, 2019 at 12:02:13PM -0800, Andy Lutomirski wrote:
> Should we maybe rename these functions? static_cpu_has() is at least
> reasonably obvious. But cpu_feature_enabled() is different for
> reasons I've never understood, and boot_cpu_has() is IMO terribly
> named. It's not about the boot cpu -- it's about doing the same thing
> but with less bloat and less performance.
Well, it does test bits in boot_cpu_data. I don't care about "boot" in
the name though so feel free to suggest something better.
> (And can we maybe collapse cpu_feature_enabled() and static_cpu_has()
> into the same function?)
I'm not sure it would be always ok to involve the DISABLED_MASK*
buildtime stuff in the checks. It probably is but it would need careful
auditing to be sure, first.
--
Regards/Gruss,
Boris.
Good mailing practices for 400: avoid top-posting and trim the reply.
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