tree df2d0a88c051a90175aba684e8d3635d1bbf4f52
parent 47f5b4542772fc4429c548a980b37d48d4e93d11
author Andre Furtado <afurtado@google.com> 1471541317 -0700
committer Andre Furtado <afurtado@google.com> 1471898444 +0000

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