kernel-hardening - mmap guard pages

Message-ID: <20110730185702.GA4667@albatros>
Date: Sat, 30 Jul 2011 22:57:02 +0400
From: Vasiliy Kulikov <segoon@...nwall.com>
To: kernel-hardening@...ts.openwall.com
Subject: mmap guard pages

Solar,

What do you think about this?

http://www.openbsd.org/papers/ven05-deraadt/mgp00025.html

In short, each mmap call adds guard pages before and after the allocated
memory.  It should catch overflows/underflows of mmap-based buffers.
AFAICS, it's possible to painlessly (in terms of vm waste) enable it on
x86-64.

Thanks,

-- 
Vasiliy

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