diff --git a/0027-polkit-Avoid-race-condition-in-scraping-proc.patch b/0027-polkit-Avoid-race-condition-in-scraping-proc.patch
new file mode 100644
index 0000000..1ba391e
--- /dev/null
+++ b/0027-polkit-Avoid-race-condition-in-scraping-proc.patch
@@ -0,0 +1,75 @@
+From 72fd713962ca2c2450e23b01d9e22017a7e28fd4 Mon Sep 17 00:00:00 2001
+From: Colin Walters <walters@verbum.org>
+Date: Thu, 22 Aug 2013 13:55:21 -0400
+Subject: [PATCH] polkit: Avoid race condition in scraping /proc
+
+If a calling process execve()s a setuid program, it can appear to be
+uid 0.  Since we're receiving requests over DBus, avoid this by simply
+passing system-bus-name as a subject.
+---
+ src/shared/polkit.c | 31 +++++--------------------------
+ 1 file changed, 5 insertions(+), 26 deletions(-)
+
+diff --git a/src/shared/polkit.c b/src/shared/polkit.c
+index cea7074..1c5e9e3 100644
+--- a/src/shared/polkit.c
++++ b/src/shared/polkit.c
+@@ -38,12 +38,8 @@ int verify_polkit(
+ 
+ #ifdef ENABLE_POLKIT
+         DBusMessage *m = NULL, *reply = NULL;
+-        const char *unix_process = "unix-process", *pid = "pid", *starttime = "start-time", *cancel_id = "";
++        const char *system_bus_name = "system-bus-name", *name = "name", *cancel_id = "";
+         uint32_t flags = interactive ? 1 : 0;
+-        pid_t pid_raw;
+-        uint32_t pid_u32;
+-        unsigned long long starttime_raw;
+-        uint64_t starttime_u64;
+         DBusMessageIter iter_msg, iter_struct, iter_array, iter_dict, iter_variant;
+         int r;
+         dbus_bool_t authorized = FALSE, challenge = FALSE;
+@@ -68,14 +64,6 @@ int verify_polkit(
+ 
+ #ifdef ENABLE_POLKIT
+ 
+-        pid_raw = bus_get_unix_process_id(c, sender, error);
+-        if (pid_raw == 0)
+-                return -EINVAL;
+-
+-        r = get_starttime_of_pid(pid_raw, &starttime_raw);
+-        if (r < 0)
+-                return r;
+-
+         m = dbus_message_new_method_call(
+                         "org.freedesktop.PolicyKit1",
+                         "/org/freedesktop/PolicyKit1/Authority",
+@@ -86,22 +74,13 @@ int verify_polkit(
+ 
+         dbus_message_iter_init_append(m, &iter_msg);
+ 
+-        pid_u32 = (uint32_t) pid_raw;
+-        starttime_u64 = (uint64_t) starttime_raw;
+-
+         if (!dbus_message_iter_open_container(&iter_msg, DBUS_TYPE_STRUCT, NULL, &iter_struct) ||
+-            !dbus_message_iter_append_basic(&iter_struct, DBUS_TYPE_STRING, &unix_process) ||
++            !dbus_message_iter_append_basic(&iter_struct, DBUS_TYPE_STRING, &system_bus_name) ||
+             !dbus_message_iter_open_container(&iter_struct, DBUS_TYPE_ARRAY, "{sv}", &iter_array) ||
+             !dbus_message_iter_open_container(&iter_array, DBUS_TYPE_DICT_ENTRY, NULL, &iter_dict) ||
+-            !dbus_message_iter_append_basic(&iter_dict, DBUS_TYPE_STRING, &pid) ||
+-            !dbus_message_iter_open_container(&iter_dict, DBUS_TYPE_VARIANT, "u", &iter_variant) ||
+-            !dbus_message_iter_append_basic(&iter_variant, DBUS_TYPE_UINT32, &pid_u32) ||
+-            !dbus_message_iter_close_container(&iter_dict, &iter_variant) ||
+-            !dbus_message_iter_close_container(&iter_array, &iter_dict) ||
+-            !dbus_message_iter_open_container(&iter_array, DBUS_TYPE_DICT_ENTRY, NULL, &iter_dict) ||
+-            !dbus_message_iter_append_basic(&iter_dict, DBUS_TYPE_STRING, &starttime) ||
+-            !dbus_message_iter_open_container(&iter_dict, DBUS_TYPE_VARIANT, "t", &iter_variant) ||
+-            !dbus_message_iter_append_basic(&iter_variant, DBUS_TYPE_UINT64, &starttime_u64) ||
++            !dbus_message_iter_append_basic(&iter_dict, DBUS_TYPE_STRING, &name) ||
++            !dbus_message_iter_open_container(&iter_dict, DBUS_TYPE_VARIANT, "s", &iter_variant) ||
++            !dbus_message_iter_append_basic(&iter_variant, DBUS_TYPE_STRING, &sender) ||
+             !dbus_message_iter_close_container(&iter_dict, &iter_variant) ||
+             !dbus_message_iter_close_container(&iter_array, &iter_dict) ||
+             !dbus_message_iter_close_container(&iter_struct, &iter_array) ||
+-- 
+1.8.3.1
+
diff --git a/systemd.spec b/systemd.spec
index 3821e5a..a876d2b 100644
--- a/systemd.spec
+++ b/systemd.spec
@@ -16,7 +16,7 @@
 Name:           systemd
 Url:            http://www.freedesktop.org/wiki/Software/systemd
 Version:        207
-Release:        3%{?gitcommit:.git%{gitcommit}}%{?dist}
+Release:        4%{?gitcommit:.git%{gitcommit}}%{?dist}
 # For a breakdown of the licensing, see README
 License:        LGPLv2+ and MIT and GPLv2+
 Summary:        A System and Service Manager
@@ -60,6 +60,7 @@ Patch0023: 0023-Verify-validity-of-session-name-when-received-from-o.patch
 Patch0024: 0024-udev-rules-avoid-erroring-on-trailing-whitespace.patch
 Patch0025: 0025-keymap-Add-Samsung-Series-5-Ultra.patch
 Patch0026: 0026-login-fix-login_is_valid-test.patch
+Patch0027: 0027-polkit-Avoid-race-condition-in-scraping-proc.patch
 
 # kernel-install patch for grubby, drop if grubby is obsolete
 Patch1000:      kernel-install-grubby.patch
@@ -691,6 +692,10 @@ getent passwd systemd-journal-gateway >/dev/null 2>&1 || useradd -r -l -u 191 -g
 %{_datadir}/systemd/gatewayd
 
 %changelog
+* Wed Sep 18 2013 Zbigniew Jędrzejewski-Szmek <zbyszek@in.waw.pl> 207-4
+- Fix policykit authentication
+Resolves: rhbz#1006680
+
 * Tue Sep 17 2013 Harald Hoyer <harald@redhat.com> 207-3
 - fixed login
 Resolves: rhbz#1005233