Brchk05 <[email protected]> writes:
> I am running Debian 2.6.26-21lenny4 and I am puzzled by an issue with the
> enforcement of page permissions. I have written a simple program with a basic
> buffer overflow and compiled two versions using gcc: one with -z execstack and
> another with -z noexecstack.
>
> So, to verify that the option takes:
>
> For the -z execstack version:
> $ readelf -l a.out | grep -i -A1 stack
> GNU_STACK 0x000000 0x00000000 0x00000000 0x00000 0x00000 RWE 0x4
>
> For the -z noexecstack version:
> $ readelf -l a.out | grep -i -A1 stack
> GNU_STACK 0x000000 0x00000000 0x00000000 0x00000 0x00000 RW 0x4
>
> However, I am able to inject and execute shellcode from a stack local
> character
> buffer in both versions. Is there another system option I am unaware of that
> affects enforcement? Is enforcement not supported for my system version?
>
> Thanks for your help.
Could you provide source? I'm interested in checking this for my system
too.
MfG
Goswin
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