Matthew D Fleming d7854da193 Add MALLOC_DEBUG_MAXZONES debug malloc(9) option to use multiple uma ... zones for each malloc bucket size. The purpose is to isolate different malloc types into hash classes, so that any buffer overruns or use-after-free will usually only affect memory from malloc types in that hash class. This is purely a debugging tool; by varying the hash function and tracking which hash class was corrupted, the intersection of the hash classes from each instance will point to a single malloc type that is being misused. At this point inspection or memguard(9) can be used to catch the offending code. Add MALLOC_DEBUG_MAXZONES=8 to -current GENERIC configuration files. The suggestion to have this on by default came from Kostik Belousov on -arch. This code is based on work by Ron Steinke at Isilon Systems. Reviewed by: -arch (mostly silence) Reviewed by: zml Approved by: zml (mentor)		2010-07-28 15:36:12 +00:00
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GENERIC	Add MALLOC_DEBUG_MAXZONES debug malloc(9) option to use multiple uma	2010-07-28 15:36:12 +00:00
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