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Commit b9a10a82 authored by Luke Huang's avatar Luke Huang
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Fix the side channel attack by using aysnc DnsResolver API with FLAG_NO_CACHE_STORE 

Before this CL, FLAG_NO_CACHE_STORE could be used to perform side
channel attack. Because this flag ensures the result is never
added to the cache, but will return a cached response if one exists.
So make FLAG_NO_CACHE_STORE imply FLAG_NO_CACHE_LOOKUP to block the
possibility of side channel attacking.

Bug: 150371903
Test: atest
Merged-In: I37391ffe315b90c0cdfd86888c6bf68b2b89f601

Change-Id: I94d8544d85c615ee985d70e9aeb8f368f100cf9b
(cherry picked from commit 9931b28c)
parent 638d7e4e
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