On Thu, Jun 08, 2006 at 01:23:42AM -0400, Robert Hudock wrote:
> Question:
>
> For some reason on suse 10.0 and 10.1 I cannot overflow the buffer so as
> to overwrite EIP no matter what. The attached code is a very simple
> example to illustrate my issue. Basically the following is what I get
> when the program segfaults on SuSE 10.1.
>
> However, the attached program produced the expected results 0x41414141
> in main () on FreeBSD versions 5.3 and 6.1, on redhat 7.2
>
> Any ideas why this is happening? What sort of security controls are in
> place that prevent this from happening? Are these controls unique to
> SuSE?
>
> -----------------------------------
> [EMAIL PROTECTED]:~> gdb ./overflow
> (gdb) run
> Starting program: /home/plato/overflow
> warning: Lowest section in system-supplied DSO at 0xffffe000 is .hash at
> ffffe0b4
>
> Program received signal SIGSEGV, Segmentation fault.
> 0x080483ec in main () at overflow.c:6
> 6 }
You wrote over the end of the stack page into unallocated memory most likely.
> (gdb)
>
> ------------------------------------------
>
>
> Regards,
>
> Robert Hudock
> main () {
> char str1[10];
> strcpy (str1,
> "AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA");
Try a shorter string (perhaps 15 - 20 A) first.
Ciao, Marcus
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