Push mmap_min_addr changes to Linus

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I'm tired of these recent exploits and SELinux being weaker against
local user priv escalation bugs using NULL pointers.  Can we push 

7c73875e7dda627040b12c19b01db634fa7f0fd1
84336d1a77ccd2c06a730ddd38e695c2324a7386
a2551df7ec568d87793d2eea4ca744e86318f205
47d439e9fb8a81a90022cfa785bf1c36c4e2aff6

To linus?  It's fixing a clear security bug in that we are not checking
DAC before granting mmap_min_addr.  If need be I'll write another
smaller patch which just does the DAC check in the SELinux security
hook, but I'd rather see the true separation.

-Eric


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