1 files changed, 104 insertions, 0 deletions

diff --git a/security/capability.c b/security/capability.c
new file mode 100644
index 000000000000..ec18d6075625
--- /dev/null
+++ b/security/capability.c
@@ -0,0 +1,104 @@
+/*
+ *  Capabilities Linux Security Module
+ *
+ *      This program is free software; you can redistribute it and/or modify
+ *      it under the terms of the GNU General Public License as published by
+ *      the Free Software Foundation; either version 2 of the License, or
+ *      (at your option) any later version.
+ *
+ */
+
+#include <linux/config.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/security.h>
+#include <linux/file.h>
+#include <linux/mm.h>
+#include <linux/mman.h>
+#include <linux/pagemap.h>
+#include <linux/swap.h>
+#include <linux/smp_lock.h>
+#include <linux/skbuff.h>
+#include <linux/netlink.h>
+#include <linux/ptrace.h>
+#include <linux/moduleparam.h>
+
+static struct security_operations capability_ops = {
+        .ptrace =                       cap_ptrace,
+        .capget =                       cap_capget,
+        .capset_check =                 cap_capset_check,
+        .capset_set =                   cap_capset_set,
+        .capable =                      cap_capable,
+        .settime =                      cap_settime,
+        .netlink_send =                 cap_netlink_send,
+        .netlink_recv =                 cap_netlink_recv,
+
+        .bprm_apply_creds =             cap_bprm_apply_creds,
+        .bprm_set_security =            cap_bprm_set_security,
+        .bprm_secureexec =              cap_bprm_secureexec,
+
+        .inode_setxattr =               cap_inode_setxattr,
+        .inode_removexattr =            cap_inode_removexattr,
+
+        .task_post_setuid =             cap_task_post_setuid,
+        .task_reparent_to_init =        cap_task_reparent_to_init,
+
+        .syslog =                       cap_syslog,
+
+        .vm_enough_memory =             cap_vm_enough_memory,
+};
+
+#define MY_NAME __stringify(KBUILD_MODNAME)
+
+/* flag to keep track of how we were registered */
+static int secondary;
+
+static int capability_disable;
+module_param_named(disable, capability_disable, int, 0);
+MODULE_PARM_DESC(disable, "To disable capabilities module set disable = 1");
+
+static int __init capability_init (void)
+{
+        if (capability_disable) {
+                printk(KERN_INFO "Capabilities disabled at initialization\n");
+                return 0;
+        }
+        /* register ourselves with the security framework */
+        if (register_security (&capability_ops)) {
+                /* try registering with primary module */
+                if (mod_reg_security (MY_NAME, &capability_ops)) {
+                        printk (KERN_INFO "Failure registering capabilities "
+                                "with primary security module.\n");
+                        return -EINVAL;
+                }
+                secondary = 1;
+        }
+        printk (KERN_INFO "Capability LSM initialized%s\n",
+                secondary ? " as secondary" : "");
+        return 0;
+}
+
+static void __exit capability_exit (void)
+{
+        if (capability_disable)
+                return;
+        /* remove ourselves from the security framework */
+        if (secondary) {
+                if (mod_unreg_security (MY_NAME, &capability_ops))
+                        printk (KERN_INFO "Failure unregistering capabilities "
+                                "with primary module.\n");
+                return;
+        }
+
+        if (unregister_security (&capability_ops)) {
+                printk (KERN_INFO
+                        "Failure unregistering capabilities with the kernel\n");
+        }
+}
+
+security_initcall (capability_init);
+module_exit (capability_exit);
+
+MODULE_DESCRIPTION("Standard Linux Capabilities Security Module");
+MODULE_LICENSE("GPL");