linux-kernel - Re: [tip: x86/mm] x86/mm: Randomize per-cpu entry area

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Message-ID: <Y1QA1RhqBYMkyEc8@hirez.programming.kicks-ass.net>
Date:   Sat, 22 Oct 2022 16:40:21 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Dave Hansen <dave.hansen@...el.com>
Cc:     Hillf Danton <hdanton@...a.com>,
        tip-bot2 for Peter Zijlstra <tip-bot2@...utronix.de>,
        Seth Jenkins <sethjenkins@...gle.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Kees Cook <keescook@...omium.org>, x86@...nel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [tip: x86/mm] x86/mm: Randomize per-cpu entry area

On Fri, Oct 21, 2022 at 05:56:02PM -0700, Dave Hansen wrote:
> On 10/21/22 17:00, Hillf Danton wrote:
> >> -#define CPU_ENTRY_AREA_MAP_SIZE		(CPU_ENTRY_AREA_PER_CPU + CPU_ENTRY_AREA_ARRAY_SIZE - CPU_ENTRY_AREA_BASE)
> >> +#ifdef CONFIG_X86_32
> >> +#define CPU_ENTRY_AREA_MAP_SIZE		(CPU_ENTRY_AREA_PER_CPU +		\
> >> +					 (CPU_ENTRY_AREA_SIZE * NR_CPUS) -	\
> >> +					 CPU_ENTRY_AREA_BASE
> > My vi editor finds un-paired bracket here.
> > Feel free to ignore it if nothing hurt.
> 
> Thanks for finding that!  Looks like Peter and I need to dust off our
> 32-bit .configs!
> 
> I just fixed the issue and pushed a new commit out to tip/x86/mm.

Pff, I've had this commit exposed to 0day for a while, you'd think it
would scream. Then again, maybe it got lost in the email firehose :/