From 2dabf1743ac89c0b683768c3f3231eb7c00448a1 Mon Sep 17 00:00:00 2001
From: Jeff Vander Stoep <jeffv@google.com>
Date: Fri, 24 Jul 2015 13:25:45 -0700
Subject: [PATCH] Do not allow apps to access network address file
Bug: 18068520
Bug: 21852542
Change-Id: I080547c61cbaacb18e003a9b2366e2392a6521ff
---
file.te | 1 +
system_server.te | 3 +++
untrusted_app.te | 3 +++
3 files changed, 7 insertions(+)
diff --git a/file.te b/file.te
index 623bb8df3..d3b09796e 100644
--- a/file.te
+++ b/file.te
@@ -21,6 +21,7 @@ type sysfs_writable, fs_type, sysfs_type, mlstrustedobject;
type sysfs_bluetooth_writable, fs_type, sysfs_type, mlstrustedobject;
type sysfs_nfc_power_writable, fs_type, sysfs_type, mlstrustedobject;
type sysfs_wake_lock, fs_type, sysfs_type;
+type sysfs_mac_address, fs_type, sysfs_type;
# /sys/devices/system/cpu
type sysfs_devices_system_cpu, fs_type, sysfs_type;
# /sys/module/lowmemorykiller
diff --git a/system_server.te b/system_server.te
index 2a1664210..0c4df43b7 100644
--- a/system_server.te
+++ b/system_server.te
@@ -417,6 +417,9 @@ allow system_server sdcard_type:dir { getattr search };
# Traverse into expanded storage
allow system_server mnt_expand_file:dir r_dir_perms;
+# Allow system process to read network MAC address
+allow system_server sysfs_mac_address:file r_file_perms;
+
###
### Neverallow rules
###
diff --git a/untrusted_app.te b/untrusted_app.te
index 72d0a1bbf..bcadc5209 100644
--- a/untrusted_app.te
+++ b/untrusted_app.te
@@ -142,3 +142,6 @@ neverallow untrusted_app mlstrustedsubject:process fork;
# bugs, so we want to ensure untrusted_app never has this
# capability.
neverallow untrusted_app file_type:file link;
+
+# Do not allow untrusted_app to access network MAC address file
+neverallow untrusted_app sysfs_mac_address:file no_rw_file_perms;
--
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