possible writes into area which is not allocated in a char array

[dheeraj@ece.gatech.edu]

>Submitter-Id:	net
>Originator:	Dheeraj Reddy
>Organization:	Georgia Tech
>Confidential:	no
>Synopsis:	An expected segfault doesn't occur
>Severity:	serious
>Priority:	medium
>Category:	c
>Class:		accepts-illegal
>Release:	3.3 (Debian) (Debian testing/unstable)
>Environment:
System: Linux bharati 2.4.21-rc4 #1 Tue May 27 12:22:58 EDT 2003 i686 GNU/Linux
Architecture: i686

host: i386-pc-linux-gnu
build: i386-pc-linux-gnu
target: i386-pc-linux-gnu
configured with: ../src/configure -v --enable-languages=c,c++,java,f77,pascal,objc,ada,treelang --prefix=/usr --mandir=/usr/share/man --infodir=/usr/share/info --with-gxx-include-dir=/usr/include/c++/3.3 --enable-shared --with-system-zlib --enable-nls --without-included-gettext --enable-__cxa_atexit --enable-clocale=gnu --enable-debug --enable-java-gc=boehm --enable-java-awt=xlib --enable-objc-gc i386-linux
>Description:
	when i try to compile and run this code, it runs without any errors.
   i am trying to access memory that i haven't allocated.
>How-To-Repeat:
	==========================
	#include <stdio.h>
	int main (int argc,
          char* argv[])
{
        char buffer[4020];
        int i;
        for (i=0; i<=4028; i++)
                buffer[i] = 'A';

	return 0;
}
        =======================
     compiling and running this piece of code doesn;t seem to give me an 
expected segmentation fault
>Fix:
	i don't know.