From 5897e23ea19566b8966d3b4b56cbd41f31640ba3 Mon Sep 17 00:00:00 2001
From: Tom Cherry <tomcherry@google.com>
Date: Tue, 1 May 2018 15:15:16 -0700
Subject: [PATCH] neverallow coredomain from writing vendor properties
System properties can be abused to get around Treble requirements of
having a clean system/vendor split. This CL seeks to prevent that by
neverallowing coredomain from writing vendor properties.
Bug: 78598545
Test: build 2017 Pixels
Test: build aosp_arm64
Change-Id: I5e06894150ba121624d753228e550ba9b81f7677
(cherry picked from commit cdb1624c27e51ee85b6a4ea6ebd529bd0e07648f)
---
public/attributes | 6 +++
public/property.te | 100 +++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 106 insertions(+)
diff --git a/public/attributes b/public/attributes
index 68696a1f5..0ec789c88 100644
--- a/public/attributes
+++ b/public/attributes
@@ -173,6 +173,12 @@ expandattribute data_between_core_and_vendor_violators false;
attribute system_executes_vendor_violators;
expandattribute system_executes_vendor_violators false;
+# All system domains which violate the requirement of not writing vendor
+# properties.
+# TODO(b/78598545): Remove this once there are no violations
+attribute system_writes_vendor_properties_violators;
+expandattribute system_writes_vendor_properties_violators false;
+
# hwservices that are accessible from untrusted applications
# WARNING: Use of this attribute should be avoided unless
# absolutely necessary. It is a temporary allowance to aid the
diff --git a/public/property.te b/public/property.te
index f8dfb0484..c9bcb8657 100644
--- a/public/property.te
+++ b/public/property.te
@@ -307,3 +307,103 @@ compatible_property_only(`
wifi_prop
}:file no_rw_file_perms;
')
+
+compatible_property_only(`
+ # Neverallow coredomain to set vendor properties
+ neverallow {
+ coredomain
+ -init
+ -system_writes_vendor_properties_violators
+ } {
+ property_type
+ -audio_prop
+ -bluetooth_a2dp_offload_prop
+ -bluetooth_prop
+ -bootloader_boot_reason_prop
+ -boottime_prop
+ -config_prop
+ -cppreopt_prop
+ -ctl_bootanim_prop
+ -ctl_bugreport_prop
+ -ctl_console_prop
+ -ctl_default_prop
+ -ctl_dumpstate_prop
+ -ctl_fuse_prop
+ -ctl_interface_restart_prop
+ -ctl_interface_start_prop
+ -ctl_interface_stop_prop
+ -ctl_mdnsd_prop
+ -ctl_restart_prop
+ -ctl_rildaemon_prop
+ -ctl_sigstop_prop
+ -ctl_start_prop
+ -ctl_stop_prop
+ -dalvik_prop
+ -debug_prop
+ -debuggerd_prop
+ -default_prop
+ -device_logging_prop
+ -dhcp_prop
+ -dumpstate_options_prop
+ -dumpstate_prop
+ -exported2_config_prop
+ -exported2_default_prop
+ -exported2_radio_prop
+ -exported2_system_prop
+ -exported2_vold_prop
+ -exported3_default_prop
+ -exported3_radio_prop
+ -exported3_system_prop
+ -exported_bluetooth_prop
+ -exported_config_prop
+ -exported_dalvik_prop
+ -exported_default_prop
+ -exported_dumpstate_prop
+ -exported_ffs_prop
+ -exported_fingerprint_prop
+ -exported_overlay_prop
+ -exported_pm_prop
+ -exported_radio_prop
+ -exported_secure_prop
+ -exported_system_prop
+ -exported_system_radio_prop
+ -exported_vold_prop
+ -exported_wifi_prop
+ -ffs_prop
+ -fingerprint_prop
+ -firstboot_prop
+ -hwservicemanager_prop
+ -last_boot_reason_prop
+ -log_prop
+ -log_tag_prop
+ -logd_prop
+ -logpersistd_logging_prop
+ -lowpan_prop
+ -mmc_prop
+ -net_dns_prop
+ -net_radio_prop
+ -netd_stable_secret_prop
+ -nfc_prop
+ -overlay_prop
+ -pan_result_prop
+ -persist_debug_prop
+ -persistent_properties_ready_prop
+ -pm_prop
+ -powerctl_prop
+ -radio_prop
+ -restorecon_prop
+ -safemode_prop
+ -serialno_prop
+ -shell_prop
+ -system_boot_reason_prop
+ -system_prop
+ -system_radio_prop
+ -test_boot_reason_prop
+ -traced_enabled_prop
+ -vendor_default_prop
+ -vendor_security_patch_level_prop
+ -vold_prop
+ -wifi_log_prop
+ -wifi_prop
+ }:property_service set;
+')
--
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