From 967f39a6e88c60b5f65a37397d6619197a1d0514 Mon Sep 17 00:00:00 2001
From: Nick Kralevich <nnk@google.com>
Date: Wed, 30 Oct 2013 14:12:21 -0700
Subject: [PATCH] Move sysfs_devices_system_cpu to the central policy.
Every device has a CPU. This is not device specific.
Allow every domain to read these files/directories.
For unknown reasons, these files are accessed by A LOT
of processes.
Allow ueventd to write to these files. This addresses
the following denials seen on mako:
<5>[ 4.935602] type=1400 audit(1383167737.512:4): avc: denied { read } for pid=140 comm="ueventd" name="cpu0" dev="sysfs" ino=3163 scontext=u:r:ueventd:s0 tcontext=u:object_r:sysfs_devices_system_cpu:s0 tclass=dir
<5>[ 4.935785] type=1400 audit(1383167737.512:5): avc: denied { open } for pid=140 comm="ueventd" name="cpu0" dev="sysfs" ino=3163 scontext=u:r:ueventd:s0 tcontext=u:object_r:sysfs_devices_system_cpu:s0 tclass=dir
<5>[ 4.935937] type=1400 audit(1383167737.512:6): avc: denied { search } for pid=140 comm="ueventd" name="cpu0" dev="sysfs" ino=3163 scontext=u:r:ueventd:s0 tcontext=u:object_r:sysfs_devices_system_cpu:s0 tclass=dir
<5>[ 4.936120] type=1400 audit(1383167737.512:7): avc: denied { write } for pid=140 comm="ueventd" name="uevent" dev="sysfs" ino=3164 scontext=u:r:ueventd:s0 tcontext=u:object_r:sysfs_devices_system_cpu:s0 tclass=file
<5>[ 4.936303] type=1400 audit(1383167737.512:8): avc: denied { open } for pid=140 comm="ueventd" name="uevent" dev="sysfs" ino=3164 scontext=u:r:ueventd:s0 tcontext=u:object_r:sysfs_devices_system_cpu:s0 tclass=file
Change-Id: I4766dc571762d8fae06aa8c26828c070b80f5936
---
domain.te | 1 +
file_contexts | 1 +
ueventd.te | 1 +
3 files changed, 3 insertions(+)
diff --git a/domain.te b/domain.te
index 6e5e83cc6..f90d80276 100644
--- a/domain.te
+++ b/domain.te
@@ -106,6 +106,7 @@ allow domain sysfs_writable:file rw_file_perms;
# Read access to pseudo filesystems.
r_dir_file(domain, proc)
r_dir_file(domain, sysfs)
+r_dir_file(domain, sysfs_devices_system_cpu)
r_dir_file(domain, inotify)
r_dir_file(domain, cgroup)
diff --git a/file_contexts b/file_contexts
index be61f9ca9..5a9f1e209 100644
--- a/file_contexts
+++ b/file_contexts
@@ -204,6 +204,7 @@
/sys/devices/platform/nfc-power/nfc_power -- u:object_r:sysfs_nfc_power_writable:s0
/sys/class/rfkill/rfkill[0-9]*/state -- u:object_r:sysfs_bluetooth_writable:s0
/sys/class/rfkill/rfkill[0-9]*/type -- u:object_r:sysfs_bluetooth_writable:s0
+/sys/devices/system/cpu(/.*)? u:object_r:sysfs_devices_system_cpu:s0
/sys/power/wake_lock -- u:object_r:sysfs_wake_lock:s0
/sys/power/wake_unlock -- u:object_r:sysfs_wake_lock:s0
#############################
diff --git a/ueventd.te b/ueventd.te
index 1562c0e88..275286bd5 100644
--- a/ueventd.te
+++ b/ueventd.te
@@ -14,6 +14,7 @@ allow ueventd device:chr_file rw_file_perms;
allow ueventd sysfs:file rw_file_perms;
allow ueventd sysfs:file setattr;
allow ueventd sysfs_type:file { relabelfrom relabelto };
+allow ueventd sysfs_devices_system_cpu:file rw_file_perms;
allow ueventd tmpfs:chr_file rw_file_perms;
allow ueventd dev_type:dir create_dir_perms;
allow ueventd dev_type:lnk_file { create unlink };
--
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