linux-kernel - Re: [PATCH] x86 : Ensure X86_FLAGS

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Message-ID: <54299737.50701@mit.edu>
Date:	Mon, 29 Sep 2014 10:30:31 -0700
From:	Andy Lutomirski <luto@...capital.net>
To:	Chuck Ebbert <cebbert.lkml@...il.com>,
	Anish Bhatt <anish@...lsio.com>
CC:	linux-kernel@...r.kernel.org, x86@...nel.org, tglx@...utronix.de,
	mingo@...hat.com, hpa@...or.com, sebastian@...-team.de
Subject: Re: [PATCH] x86 : Ensure X86_FLAGS_NT is cleared on syscall entry

On 09/25/2014 04:00 PM, Chuck Ebbert wrote:
> #include <stdio.h>
> #include <unistd.h>
> 
> int main()
> {
> 	asm volatile("pushfq           \n\t" \
> 		     "pop %rax         \n\t" \
> 		     "or $0x4000,%rax  \n\t" \
> 		     "push %rax        \n\t" \
> 		     "popfq            \n\t");

You're missing clobbers here.  But fixing that has no effect.

> 	sleep(1);
> 
> 	return 0;
> }

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