Re: [Announcement] "Exec Shield", new Linux security feature

[John Bradford]

> > > Ingo, do you want protection against shell code injection ? Have the
> > > kernel to assign random stack addresses to processes and they won't be
> > > able to guess the stack pointer to place the jump. I use a very simple
> > > trick in my code :
> > 
> > stack randomisation is already present in the kernel, in the form of
> > cacheline coloring for HT cpus...
> 
> we could make it even more prominent than just coloring, to introduce the
> kind of variability that Davide's approach introduces. It has to be a
> separate patch obviously. This would further reduce the chance that a
> remote attack that has to guess the stack would succeed on a random box.

Slightly off-topic, but does anybody know whether IA64 or x86-64 allow
you to make the stack non-executable in the same way you can on SPARC?

John.