patch to randomize mmap offsets

Tue Jan 16 18:26:52 PST 2007

Kevin L. Kane wrote:
I pulled this little patch from OpenBSD to randomize mmap offsets as
per request on projects page, described by
http://www.openbsd.org/papers/auug04/index.html
More about this patch:

this I386_MAX_EXE_ADDR is only used for openbsd's W^X i386 implementation, I think.  The code is not really complicated, so I think we should add it.  However, I think that it should be optional to switch on via a sysctl.  Putting everything in kernel options makes everything so... bulky.  Of course this sysctl would need to be guarded by securelevel.

cheers
 simon
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