Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
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linux
1/*
2 * Capabilities Linux Security Module
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
8 *
9 */
10
11#include <linux/module.h>
12#include <linux/init.h>
13#include <linux/kernel.h>
14#include <linux/security.h>
15#include <linux/file.h>
16#include <linux/mm.h>
17#include <linux/mman.h>
18#include <linux/pagemap.h>
19#include <linux/swap.h>
20#include <linux/smp_lock.h>
21#include <linux/skbuff.h>
22#include <linux/netlink.h>
23#include <linux/ptrace.h>
24#include <linux/moduleparam.h>
25
26static struct security_operations capability_ops = {
27 .ptrace = cap_ptrace,
28 .capget = cap_capget,
29 .capset_check = cap_capset_check,
30 .capset_set = cap_capset_set,
31 .capable = cap_capable,
32 .settime = cap_settime,
33 .netlink_send = cap_netlink_send,
34 .netlink_recv = cap_netlink_recv,
35
36 .bprm_apply_creds = cap_bprm_apply_creds,
37 .bprm_set_security = cap_bprm_set_security,
38 .bprm_secureexec = cap_bprm_secureexec,
39
40 .inode_setxattr = cap_inode_setxattr,
41 .inode_removexattr = cap_inode_removexattr,
42
43 .task_post_setuid = cap_task_post_setuid,
44 .task_reparent_to_init = cap_task_reparent_to_init,
45
46 .syslog = cap_syslog,
47
48 .vm_enough_memory = cap_vm_enough_memory,
49};
50
51/* flag to keep track of how we were registered */
52static int secondary;
53
54static int capability_disable;
55module_param_named(disable, capability_disable, int, 0);
56MODULE_PARM_DESC(disable, "To disable capabilities module set disable = 1");
57
58static int __init capability_init (void)
59{
60 if (capability_disable) {
61 printk(KERN_INFO "Capabilities disabled at initialization\n");
62 return 0;
63 }
64 /* register ourselves with the security framework */
65 if (register_security (&capability_ops)) {
66 /* try registering with primary module */
67 if (mod_reg_security (KBUILD_MODNAME, &capability_ops)) {
68 printk (KERN_INFO "Failure registering capabilities "
69 "with primary security module.\n");
70 return -EINVAL;
71 }
72 secondary = 1;
73 }
74 printk (KERN_INFO "Capability LSM initialized%s\n",
75 secondary ? " as secondary" : "");
76 return 0;
77}
78
79static void __exit capability_exit (void)
80{
81 if (capability_disable)
82 return;
83 /* remove ourselves from the security framework */
84 if (secondary) {
85 if (mod_unreg_security (KBUILD_MODNAME, &capability_ops))
86 printk (KERN_INFO "Failure unregistering capabilities "
87 "with primary module.\n");
88 return;
89 }
90
91 if (unregister_security (&capability_ops)) {
92 printk (KERN_INFO
93 "Failure unregistering capabilities with the kernel\n");
94 }
95}
96
97security_initcall (capability_init);
98module_exit (capability_exit);
99
100MODULE_DESCRIPTION("Standard Linux Capabilities Security Module");
101MODULE_LICENSE("GPL");