Alan Cox 201f03b8e7 Modify vm_map_growstack() to protect itself from the possibility of the
gap entry in the vm map being smaller than the sysctl-derived stack guard
size.  Otherwise, the value of max_grow can suffer from overflow, and the
roundup(grow_amount, sgrowsiz) will not be properly capped, resulting in
an assertion failure.

In collaboration with:	kib
MFC after:	3 days
2017-07-01 23:39:49 +00:00
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