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Date: Tue, 09 Apr 2013 17:14:45 -0700
From: "H. Peter Anvin" <hpa@...or.com>
To: Kees Cook <keescook@...omium.org>
CC: linux-kernel@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>,
Ingo Molnar <mingo@...hat.com>, x86@...nel.org,
Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
Jeremy Fitzhardinge <jeremy@...p.org>,
Marcelo Tosatti <mtosatti@...hat.com>, Alex Shi <alex.shi@...el.com>,
Alexander Duyck <alexander.h.duyck@...el.com>,
Frederic Weisbecker <fweisbec@...il.com>,
Steven Rostedt <rostedt@...dmis.org>,
"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
xen-devel@...ts.xensource.com,
virtualization@...ts.linux-foundation.org,
kernel-hardening@...ts.openwall.com,
Dan Rosenberg <drosenberg@...curity.com>,
Julien Tinnes <jln@...gle.com>, Will Drewry <wad@...omium.org>,
Eric Northup <digitaleric@...gle.com>
Subject: Re: [PATCH v2] x86: use fixed read-only IDT
On 04/09/2013 09:39 AM, Kees Cook wrote:
> -
> static void __cpuinit intel_smp_check(struct cpuinfo_x86 *c)
> {
> /* calling is from identify_secondary_cpu() ? */
> @@ -206,8 +192,7 @@ static void __cpuinit intel_workarounds(struct cpuinfo_x86 *c)
> /*
> * All current models of Pentium and Pentium with MMX technology CPUs
> * have the F0 0F bug, which lets nonprivileged users lock up the
> - * system.
> - * Note that the workaround only should be initialized once...
> + * system. Announce that the fault handler will be checking for it.
> */
> c->f00f_bug = 0;
> if (!paravirt_enabled() && c->x86 == 5) {
> @@ -215,7 +200,6 @@ static void __cpuinit intel_workarounds(struct cpuinfo_x86 *c)
>
> c->f00f_bug = 1;
> if (!f00f_workaround_enabled) {
> - trap_init_f00f_bug();
> printk(KERN_NOTICE "Intel Pentium with F0 0F bug - workaround enabled.\n");
> f00f_workaround_enabled = 1;
> }
Why do we care about this message anymore? It provides no relevant user
information, the flag itself is already in /proc/cpuinfo, and the
message is likely to be wrong since all it does is look for an Intel CPU
with family == 5.
-hpa
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