Re: [CFT] ASLR, PIE, and segvguard on 11-current and 10-stable

It runs on all architectures FreeBSD supports. The question is how well
it runs. The wider the testing, the better the code, of course. We're
actively testing on amd64 and i386 with limited testing on sparc64 and
ARM. I've been running with this patches on amd64 on multiple machines
for months. amd64 is rock solid from my experience. But your mileage may
vary, hence the CFT. :-)

Thanks,

Shawn

On May 14, 2014 10:02 AM -0700, Adrian Chadd wrote:
> Hi!
> 
> Cool! Does it run on MIPS? :P
> 
> 
> -a
> 
> 
> On 14 May 2014 06:58, Shawn Webb <lattera_at_gmail.com> wrote:
> > Hey All,
> >
> > [NOTE: crossposting between freebsd-current_at_, freebsd-security_at_, and
> > freebsd-stable_at_. Please forgive me if crossposting is frowned upon.]
> >
> > Address Space Layout Randomization, or ASLR for short, is an exploit
> > mitigation technology. It helps secure applications against low-level
> > exploits. A popular secure implementation is known as PaX ASLR, which is
> > a third-party patch for Linux. Our implementation is based off of PaX's.
> >
> > Oliver Pinter, Danilo Egea, and I have been working hard to bring more
> > features and robust stability to our ASLR patches. We've done extensive
> > testing on amd64. We'd like to get as many people testing these patches.
> > Given the nature of them, we'd also like as many eyeballs reviewing the
> > code as well.
> >
> > I have a Raspberry Pi and have noticed a few bugs. On ARM (at least, on
> > the RPI), when a parent forks a child, and the child gracefully exits,
> > the parent segfaults with the pc register pointing to 0xc0000000. That
> > address is always the same, no matter the application. If anyone knows
> > the ARM architecture well, and how FreeBSD ties into it, I'd like a
> > little guidance.
> >
> > I also have a sparc64 box, but I'm having trouble getting a vanilla
> > 11-current system to be stable on it. I ought to file a few PRs.
> >
> > You can find links to the patches below.
> >
> > Patch for 11-current:
> > http://www.crysys.hu/~op/freebsd/patches/20140514091132-freebsd-current-aslr-segvguard-SNAPSHOT.diff
> >
> > Patch for 10-stable:
> > http://www.crysys.hu/~op/freebsd/patches/20140514091132-freebsd-stable-10-aslr-segvguard-SNAPSHOT.diff
> >
> > Thanks,
> >
> > Shawn Webb