aboutsummaryrefslogtreecommitdiffstats
path: root/security/tomoyo/load_policy.c
diff options
context:
space:
mode:
Diffstat (limited to 'security/tomoyo/load_policy.c')
-rw-r--r--security/tomoyo/load_policy.c81
1 files changed, 81 insertions, 0 deletions
diff --git a/security/tomoyo/load_policy.c b/security/tomoyo/load_policy.c
new file mode 100644
index 00000000000..bbada7ca1b9
--- /dev/null
+++ b/security/tomoyo/load_policy.c
@@ -0,0 +1,81 @@
+/*
+ * security/tomoyo/load_policy.c
+ *
+ * Policy loader launcher for TOMOYO.
+ *
+ * Copyright (C) 2005-2010 NTT DATA CORPORATION
+ */
+
+#include "common.h"
+
+/* path to policy loader */
+static const char *tomoyo_loader = "/sbin/tomoyo-init";
+
+/**
+ * tomoyo_policy_loader_exists - Check whether /sbin/tomoyo-init exists.
+ *
+ * Returns true if /sbin/tomoyo-init exists, false otherwise.
+ */
+static bool tomoyo_policy_loader_exists(void)
+{
+ /*
+ * Don't activate MAC if the policy loader doesn't exist.
+ * If the initrd includes /sbin/init but real-root-dev has not
+ * mounted on / yet, activating MAC will block the system since
+ * policies are not loaded yet.
+ * Thus, let do_execve() call this function everytime.
+ */
+ struct path path;
+
+ if (kern_path(tomoyo_loader, LOOKUP_FOLLOW, &path)) {
+ printk(KERN_INFO "Not activating Mandatory Access Control now "
+ "since %s doesn't exist.\n", tomoyo_loader);
+ return false;
+ }
+ path_put(&path);
+ return true;
+}
+
+/**
+ * tomoyo_load_policy - Run external policy loader to load policy.
+ *
+ * @filename: The program about to start.
+ *
+ * This function checks whether @filename is /sbin/init , and if so
+ * invoke /sbin/tomoyo-init and wait for the termination of /sbin/tomoyo-init
+ * and then continues invocation of /sbin/init.
+ * /sbin/tomoyo-init reads policy files in /etc/tomoyo/ directory and
+ * writes to /sys/kernel/security/tomoyo/ interfaces.
+ *
+ * Returns nothing.
+ */
+void tomoyo_load_policy(const char *filename)
+{
+ char *argv[2];
+ char *envp[3];
+
+ if (tomoyo_policy_loaded)
+ return;
+ /*
+ * Check filename is /sbin/init or /sbin/tomoyo-start.
+ * /sbin/tomoyo-start is a dummy filename in case where /sbin/init can't
+ * be passed.
+ * You can create /sbin/tomoyo-start by
+ * "ln -s /bin/true /sbin/tomoyo-start".
+ */
+ if (strcmp(filename, "/sbin/init") &&
+ strcmp(filename, "/sbin/tomoyo-start"))
+ return;
+ if (!tomoyo_policy_loader_exists())
+ return;
+
+ printk(KERN_INFO "Calling %s to load policy. Please wait.\n",
+ tomoyo_loader);
+ argv[0] = (char *) tomoyo_loader;
+ argv[1] = NULL;
+ envp[0] = "HOME=/";
+ envp[1] = "PATH=/sbin:/bin:/usr/sbin:/usr/bin";
+ envp[2] = NULL;
+ call_usermodehelper(argv[0], argv, envp, 1);
+ tomoyo_check_profile();
+}