Re: Linux-2.4.22 memory overwriting

[Roberto Sanchez]

Julien Rebetez wrote:
> Hi !
> I've writen the following program :
>
>
> #include <stdio.h>
>
> int main ()
> {
>        int p[4];
>        p[0]=1;
>        p[1]=2;
>        p[2]=3;
>        p[3]=4;
>        p[4]=5;
>
>        printf ("%i, %i, %i, %i, %i\n", p[0], p[1], p[2], p[3],
> p[4]);
>        return 0;
> }
>
> I compile it with :
>
> gcc -o test test.c -Wall
>
> and when i launch it, the output is :
>
> julien:$> ./test
> 1, 2, 3, 4, 5
>
> Should I not get a SIGSEV from the system ? Isn't it dangerous to allow 
> the user to put 5 elements in a 4 elements tab?
>
> (tested on Linux 2.4.22 on a i686)
>
> Thanks

Remember that C was written by experts for use by experts.  C makes
the unfortunate assumption that you know *exactly* what you are doing.
This flexibility is great for tho advanced system programmer, but
dangerous for the unwary.

-Roberto

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