linux-kernel - Re: [PATCH] Add a text

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Message-ID: <b6331d08-d5fb-4ec5-80e2-ff32d3ce93ce@email.android.com>
Date:	Wed, 27 Nov 2013 14:25:29 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Borislav Petkov <bp@...en8.de>
CC:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andy Lutomirski <luto@...capital.net>,
	Andi Kleen <andi@...stfloor.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...nel.org>,
	Andi Kleen <ak@...ux.intel.com>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH] Add a text_poke syscall v2

Actually the CPUID is superfluous on anything than the executing CPU since IRET is serializing.

Borislav Petkov <bp@...en8.de> wrote:
>On Wed, Nov 27, 2013 at 02:02:50PM -0800, H. Peter Anvin wrote:
>> For the record, this is the entire patch necessary to do the
>> sync_cores() system call -- and no potential interactions with
>security
>> frameworks or whatnot, simply because no security-sensitive
>operations
>> are performed of any kind.
>> 
>> Comments/opinions appreciated.
>
>And we do this in the kernel not because userspace can't execute
>sync_core() aka CPUID but because for userspace it is hard to IPI all
>cores easily?

-- 
Sent from my mobile phone.  Please pardon brevity and lack of formatting.
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