Security: Prevent DoS from hashmap collisions #1748
Description
DoS using hashmap collisions
dart/runtime/vm/object.cc
6156 hash_ += ch;
6157 hash_ += hash_ << 10;
6158 hash_ ^= hash_ >> 6;
hash(attacker-supplied data) can be predicted
if hashmap is used on attacker-supplied keys, attacker can cause O(n^2) operations on the hashmap
background: http://www.youtube.com/watch?v=R2Cq3CLI6H8
solution: follow-up with Erik / apply same counter measures as V8