linux-kernel - Re: [patch 03/18] Dont leak NT bit into next task

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Date:	Wed, 21 Feb 2007 18:14:08 +0100 (MET)
From:	Jan Engelhardt <jengelh@...ux01.gwdg.de>
To:	Giuseppe Bilotta <giuseppe.bilotta@...il.com>
cc:	linux-kernel@...r.kernel.org
Subject: Re: [patch 03/18] Dont leak NT bit into next task


On Feb 21 2007 11:00, Giuseppe Bilotta wrote:
>On Wednesday 21 February 2007 02:49, Greg KH wrote:
>
>>  /* frame pointer must be last for get_wchan */
>> -#define SAVE_CONTEXT    "pushq %%rbp ; movq %%rsi,%%rbp\n\t"
>> -#define RESTORE_CONTEXT "movq %%rbp,%%rsi ; popq %%rbp\n\t"
>> +#define SAVE_CONTEXT    "pushf ; pushq %%rbp ; movq %%rsi,%%rbp\n\t"
>> +#define RESTORE_CONTEXT "movq %%rbp,%%rsi ; popq %%rbp ; popf\t"
>
>No idea if this is a problem or not, but you forgot a \n after popf.

It is on the edge. RESTORE_CONTEXT will not be passed any 
arguments, so it is the only thing in a single line, and hence
the implicit \n of the source file applies after \t.
But yes, it may be dangerous. Better is an explicit \n or semicolon
after popf.


Jan
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