Re: Executability of the stack

[James Courtier-Dutton <James@superbug.co.uk>]

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".