tree 67b0097caf625005cb36e59759bc6cc81ddbee22
parent 9db468581809dc745b31fef83c8470a11d46e774
author Andre Furtado <afurtado@google.com> 1471541317 -0700
committer gitbuildkicker <android-build@google.com> 1472233261 -0700

30481342: Security Vulnerability - TOCTOU in MmsProvider allows access to files as phone (radio) uid

Problem: MmsProvider.openFile validated the current _data column
in the DB and then called ContentProvider.openFileHelper which was again
reading from the DB. A race condition could cause the second DB read to
read an updated, malicious value.

Fix: instead of doing the first DB check and calling
ContentProvider.openFileHelper, we're now just calling
MmsProvider.safeOpenFileHelper which does a single check.

Test: used the POC provided for this incident.

b/30481342

Change-Id: I653129359130b9fae59d4c355320b266c158a698
(cherry picked from commit 5bc7f9682d72c89ba252be6471b2db9b7e7815e3)