Re: Non-Exec stack patches

From: John Reiser
Date: Wed Mar 24 2004 - 14:10:55 EST

Only one mprotect() call is needed to make the entire stack

mprotect() only works on the portion that is currently allocated.
If the stack grows, then another call is needed. Tracking the high-
water mark is an expense. Forcing the allocation of the maximum
extent for the stack of the current thread, even to the same copy-
on-write all-zero page, can cause memory overcommit problems.

John Reiser, jreiser@xxxxxxxxxxxx

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