linux-kernel - Re: [PATCH] NX protection for kernel data : fix 32 bits S3 suspend

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Date:	Wed, 2 Feb 2011 07:26:32 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	castet.matthieu@...e.fr
Cc:	Linux Kernel list <linux-kernel@...r.kernel.org>,
	linux-security-module@...r.kernel.org,
	Matthias Hopf <mhopf@...e.de>, rjw@...k.pl,
	Andrew Morton <akpm@...ux-foundation.org>,
	"H. Peter Anvin" <hpa@...or.com>
Subject: Re: [PATCH] NX protection for kernel data : fix 32 bits S3 suspend


* castet.matthieu@...e.fr <castet.matthieu@...e.fr> wrote:

> Quoting Ingo Molnar <mingo@...e.hu>:
> 
> >
> > * matthieu castet <castet.matthieu@...e.fr> wrote:
> >
> > >  static inline int is_kernel_text(unsigned long addr)
> > >  {
> > > +#if defined(CONFIG_X86_32) && defined(CONFIG_ACPI_SLEEP)
> > > +	/*
> > > +	 * We need to make the wakeup trampoline in first 1MB !NX
> > > +	 */
> > > +	if (addr >= PAGE_OFFSET && addr <= (PAGE_OFFSET + (1<<20)))
> > > +		return 1;
> > > +#endif
> >
> > That's pretty ugly. Why not use set_memory_x()/set_memory_nx(), and only for
> > the
> > trampoline itself? Does the whole 1MB need to be marked X?
>
> The previous code was doing that.

So why not call set_memory_x() in your patch? Mind trying that?

Thanks,

	Ingo
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