Re: ia32 binfmt problem with x86-64

[Markus Schoder]

On Tuesday 27 June 2006 10:43, Andi Kleen wrote:
> lists@xxxxxxxxxxxxxxxx writes:
> > 
> > This all makes sense. But 64 bit and 32 bit apps should get the same
> > treatment right?
> 
> No - i386 behaves different here than x86-64.
> 
> x86-64 always had NX/PROT_EXEC (although not all CPUs have always enforced it)
> while i386 has lots of legacy binaries that don't know about it.

But then 32 bit apps should be handled in a less restrictive fashion
than 64 bit apps, no? And also probably only for binaries that do
not have the exec_stack flag at all.

What I fail to understand then is why a 64 bit application with the
exec_stack flag set gets read_implies_exec and a 32 bit application
also with the exec_stack flag set does not (this is also the only case
where the behavior differs).

--
Markus
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