Please take a look at on this exploit:
http://blog.zx2c4.com/749
It is interesting to think about /proc/pid/mem protection and about
building su with PIE enabled...

Regards:
Dw.
--
dr Tóth Attila, Radiológus, 06-20-825-8057
Attila Toth MD, Radiologist, +36-20-825-8057

On Tuesday 24 January 2012 00:49:19 Tóth Attila wrote:
> Please take a look at on this exploit:
> http://blog.zx2c4.com/749
> It is interesting to think about /proc/pid/mem protection and about
> building su with PIE enabled...
>
> Regards:
> Dw.

BTW this in "vanilla" gentoo does not work because of the permission of the su
file:
ls -l /usr/bin/su
-rws--x--x 1 root root 36776 18 gen 21.31 /usr/bin/su

readelf cannot read the address, but there can be other ways to access the
binary for example for group "disk"

hardened gentoo is un-affected as expected (but you already know)