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Subject: Re: Is this the ultimate stack-smash fix?
From: Xavier Bestel <xavier.bestel@free.fr>
To: Andreas Bombe <andreas.bombe@munich.netsurf.de>
Cc: Eric "W." Biederman <ebiederm@xmission.com>, linux-kernel@vger.kernel.org
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Date: 20 Feb 2001 10:09:55 +0100
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Le 20 Feb 2001 02:10:12 +0100, Andreas Bombe a ?crit :
> On Sat, Feb 17, 2001 at 09:53:48PM -0700, Eric W. Biederman wrote:
> > Peter Samuelson <peter@cadcamlab.org> writes:
> > > It also sounds like you will be
> > > breaking the extremely useful C postulate that, at the ABI level at
> > > least, arrays and pointers are equivalent.  I can't see *how* you plan
> > > to work around that one.
> > 
> > Huh?  Pointers and arrays are clearly different at the ABI level.
> > 
> > A pointer is a word that contains an address of something.
> > An array is an array.
> 
> An array is a word that contains the address of the first element.


No. Exercise 3: compile and run this:
file a.c:
char array[] = "I'm really an array";

file b.c:
extern char* array;
main() { printf("array = %s\n", array); }

... and watch it biting the dust !
in short: an array is NOT a pointer.


    Xav

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