tree bcb4c9061e235a0f77712ad52b5edcabda5ce527
parent 638d7e4e02367ba25eecefb9f7fc05b4d740e459
author Luke Huang <huangluke@google.com> 1590662422 +0000
committer Luke Huang <huangluke@google.com> 1590770686 +0000

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 9931b28c98218dac4fa50288b4deb10da85073f1)