From 254ad0da3ac3709cbce81af2a6faeb23317afea3 Mon Sep 17 00:00:00 2001
From: Chenbo Feng <fengc@google.com>
Date: Tue, 1 Aug 2017 18:06:18 -0700
Subject: [PATCH] sepolicy: Allow mount cgroupv2 and bpf fs

Some necessary sepolicy rule changes for init process to create directory,
mount cgroupv2 module and mount bpf filesystem. Also allow netd to create
and pin bpf object as files and read it back from file under the
directory where bpf filesystem is mounted.

Test: bpf maps show up under /sys/fs/bpf/
Change-Id: I579d04f60d7e20bd800d970cd28cd39fda9d20a0
---
 private/compat/26.0/26.0.ignore.cil | 2 ++
 private/genfs_contexts              | 2 ++
 public/file.te                      | 3 +++
 public/init.te                      | 4 ++++
 public/netd.te                      | 4 ++++
 5 files changed, 15 insertions(+)

diff --git a/private/compat/26.0/26.0.ignore.cil b/private/compat/26.0/26.0.ignore.cil
index 50d4ee7be..ab4a49a7b 100644
--- a/private/compat/26.0/26.0.ignore.cil
+++ b/private/compat/26.0/26.0.ignore.cil
@@ -6,9 +6,11 @@
   ( adbd_exec
     bootloader_boot_reason_prop
     broadcastradio_service
+    cgroup_bpf
     crossprofileapps_service
     e2fs
     e2fs_exec
+    fs_bpf
     hal_broadcastradio_hwservice
     hal_cas_hwservice
     hal_lowpan_hwservice
diff --git a/private/genfs_contexts b/private/genfs_contexts
index e0cafa48b..c07cd4c3b 100644
--- a/private/genfs_contexts
+++ b/private/genfs_contexts
@@ -84,6 +84,7 @@ genfscon proc /zoneinfo u:object_r:proc_zoneinfo:s0
 # selinuxfs booleans can be individually labeled.
 genfscon selinuxfs / u:object_r:selinuxfs:s0
 genfscon cgroup / u:object_r:cgroup:s0
+genfscon cgroup2 / u:object_r:cgroup_bpf:s0
 # sysfs labels can be set by userspace.
 genfscon sysfs / u:object_r:sysfs:s0
 genfscon sysfs /devices/system/cpu u:object_r:sysfs_devices_system_cpu:s0
@@ -173,3 +174,4 @@ genfscon pstore / u:object_r:pstorefs:s0
 genfscon functionfs / u:object_r:functionfs:s0
 genfscon usbfs / u:object_r:usbfs:s0
 genfscon binfmt_misc / u:object_r:binfmt_miscfs:s0
+genfscon bpf / u:object_r:fs_bpf:s0
diff --git a/public/file.te b/public/file.te
index e3ffa34e5..cdaaf221c 100644
--- a/public/file.te
+++ b/public/file.te
@@ -60,6 +60,7 @@ type proc_vmallocinfo, fs_type;
 type proc_zoneinfo, fs_type;
 type selinuxfs, fs_type, mlstrustedobject;
 type cgroup, fs_type, mlstrustedobject;
+type cgroup_bpf, fs_type;
 type sysfs, fs_type, sysfs_type, mlstrustedobject;
 type sysfs_android_usb, fs_type, sysfs_type;
 type sysfs_uio, sysfs_type, fs_type;
@@ -81,6 +82,7 @@ type sysfs_switch, fs_type, sysfs_type;
 type sysfs_usb, sysfs_type, file_type, mlstrustedobject;
 type sysfs_wakeup_reasons, fs_type, sysfs_type;
 type sysfs_fs_ext4_features, sysfs_type, fs_type;
+type fs_bpf, fs_type, sysfs_type;
 type configfs, fs_type;
 # /sys/devices/system/cpu
 type sysfs_devices_system_cpu, fs_type, sysfs_type;
@@ -364,6 +366,7 @@ type vndservice_contexts_file, file_type;
 # Allow files to be created in their appropriate filesystems.
 allow fs_type self:filesystem associate;
 allow cgroup tmpfs:filesystem associate;
+allow cgroup_bpf tmpfs:filesystem associate;
 allow sysfs_type sysfs:filesystem associate;
 allow debugfs_type { debugfs debugfs_tracing }:filesystem associate;
 allow file_type labeledfs:filesystem associate;
diff --git a/public/init.te b/public/init.te
index 450afd84e..80e9e7710 100644
--- a/public/init.te
+++ b/public/init.te
@@ -69,6 +69,10 @@ allow init self:global_capability_class_set sys_admin;
 # Create and mount on directories in /.
 allow init rootfs:dir create_dir_perms;
 allow init { rootfs cache_file cgroup storage_file system_data_file system_file vendor_file postinstall_mnt_dir }:dir mounton;
+allow init cgroup_bpf:dir { create mounton };
+
+# Mount bpf fs on sys/fs/bpf
+allow init fs_bpf:dir mounton;
 
 # Mount on /dev/usb-ffs/adb.
 allow init device:dir mounton;
diff --git a/public/netd.te b/public/netd.te
index fa03dbdb6..ec18113d4 100644
--- a/public/netd.te
+++ b/public/netd.te
@@ -7,6 +7,7 @@ net_domain(netd)
 allowxperm netd self:udp_socket ioctl priv_sock_ioctls;
 
 r_dir_file(netd, cgroup)
+r_dir_file(netd, cgroup_bpf)
 allow netd system_server:fd use;
 
 allow netd self:global_capability_class_set { net_admin net_raw kill };
@@ -57,6 +58,9 @@ allow netd sysfs_net:file w_file_perms;
 # TODO: added to match above sysfs rule. Remove me?
 allow netd sysfs_usb:file write;
 
+allow netd fs_bpf:dir  create_dir_perms;
+allow netd fs_bpf:file create_file_perms;
+
 # TODO: netd previously thought it needed these permissions to do WiFi related
 #       work.  However, after all the WiFi stuff is gone, we still need them.
 #       Why?