Re: Executability of the stack

[James Courtier-Dutton]

Arjan van de Ven wrote:
> On Thu, 2006-12-14 at 10:26 +0100, Franck Pommereau wrote:
> > Dear Linux developers,
> >
> > I recently discovered that the Linux kernel on 32 bits x86 processors
> > reports the stack as being non-executable while it is actually
> > executable (because located in the same memory segment).
>
> this is not per se true, it depends on the capabilities of your 32 bit
> x86 processor.
>
>
> > # grep maps /proc/self/maps
> > bfce8000-bfcfe000 rw-p bfce8000 00:00 0          [stack]
>
> this shows that the *intent* is to have it non-executable. 
> Not all x86 processors can enforce this. All modern ones do.
>
> > Is there any reason for this situation? 
>
> the alternative (showing effective permission) is equally confusing;
> apps would see permissions they didn't set...

Why not show both.
"intent" and "effective".

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