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2009 Sep 15
4
Protecting against kernel NULL-pointer derefs
All,
Given the amount of NULL-pointer dereference vulnerabilities in the
FreeBSD kernel that have been discovered of late, I've started looking
at a way to generically protect against the code execution possibilities
of such bugs.
By disallowing userland to map pages at address 0x0 (and a bit beyond),
it is possible to make such NULL-pointer deref bugs mere DoS'es instead
of code