Re: Regression in 2.6.25-rc3: s2ram segfaults before suspending

[H. Peter Anvin]

Pavel Machek wrote:
> On Mon 2008-03-03 09:10:35, H. Peter Anvin wrote:
> > Pavel Machek wrote:
> > > > The only thing I don't understand is why this is suddenly a problem with
> > > > 2.6.25, and not with 2.6.24? Is there a bug in 2.6.24 and previously
> > > > that allows real-mode execution of non-executable pages?
> > > It is strange indeed... Should it be traced as an regression?
> > I'd like to understand what the heck happened, but as far as we can observe 
> > right now, it's a *progression*, not a regression, since executing out of a 
> > non-PROT_EXEC area isn't *supposed* to work...
>
> Okay, I guess this depends on the eye of the beholder... because s2ram
> *is* supposed to work ;-).
>
> Ideally, I'd like to keep 2.6.24 behaviour for at least a while, so we
> can try to fix the libx86 out there or something...
> 									Pavel
> PS: Matthew, there's problem in libx86: it tries to execute from area
> not marked as PROT_EXEC.

Allowing execution of a PROT_EXEC area is a security hole.  The fact 
that you happened to benefit from it doesn't change its nature as a 
security hole.

	-hpa
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