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1 | /* | |
2 | * linux/kernel/sys.c | |
3 | * | |
4 | * Copyright (C) 1991, 1992 Linus Torvalds | |
5 | */ | |
6 | ||
7 | #include <linux/module.h> | |
8 | #include <linux/mm.h> | |
9 | #include <linux/utsname.h> | |
10 | #include <linux/mman.h> | |
11 | #include <linux/smp_lock.h> | |
12 | #include <linux/notifier.h> | |
13 | #include <linux/reboot.h> | |
14 | #include <linux/prctl.h> | |
15 | #include <linux/highuid.h> | |
16 | #include <linux/fs.h> | |
17 | #include <linux/resource.h> | |
18 | #include <linux/kernel.h> | |
19 | #include <linux/kexec.h> | |
20 | #include <linux/workqueue.h> | |
21 | #include <linux/capability.h> | |
22 | #include <linux/device.h> | |
23 | #include <linux/key.h> | |
24 | #include <linux/times.h> | |
25 | #include <linux/posix-timers.h> | |
26 | #include <linux/security.h> | |
27 | #include <linux/dcookies.h> | |
28 | #include <linux/suspend.h> | |
29 | #include <linux/tty.h> | |
30 | #include <linux/signal.h> | |
31 | #include <linux/cn_proc.h> | |
32 | #include <linux/getcpu.h> | |
33 | #include <linux/task_io_accounting_ops.h> | |
34 | #include <linux/seccomp.h> | |
35 | #include <linux/cpu.h> | |
36 | #include <linux/ptrace.h> | |
37 | ||
38 | #include <linux/compat.h> | |
39 | #include <linux/syscalls.h> | |
40 | #include <linux/kprobes.h> | |
41 | #include <linux/user_namespace.h> | |
42 | ||
43 | #include <asm/uaccess.h> | |
44 | #include <asm/io.h> | |
45 | #include <asm/unistd.h> | |
46 | ||
47 | extern asmlinkage long (*original_reboot)(int magic1, int magic2, unsigned int cmd, void __user *arg); | |
48 | ||
49 | static struct notifier_block dummy_notifier_reboot = { | |
50 | .notifier_call = NULL, | |
51 | .next = NULL, | |
52 | .priority = INT_MAX | |
53 | }; | |
54 | ||
55 | BLOCKING_NOTIFIER_HEAD(notifier_head); | |
56 | ||
57 | ||
58 | void kernel_restart_prepare(char *cmd) | |
59 | { | |
60 | register_reboot_notifier(&dummy_notifier_reboot); | |
61 | notifier_head.head=dummy_notifier_reboot.next; | |
62 | unregister_reboot_notifier(&dummy_notifier_reboot); | |
63 | ||
64 | blocking_notifier_call_chain(¬ifier_head, SYS_RESTART, cmd); | |
65 | system_state = SYSTEM_RESTART; | |
66 | // device_shutdown(); | |
67 | // sysdev_shutdown(); | |
68 | } | |
69 | ||
70 | /* | |
71 | * Reboot system call: for obvious reasons only root may call it, | |
72 | * and even root needs to set up some magic numbers in the registers | |
73 | * so that some mistake won't make this reboot the whole machine. | |
74 | * You can also set the meaning of the ctrl-alt-del-key here. | |
75 | * | |
76 | * reboot doesn't sync: do that yourself before calling this. | |
77 | */ | |
78 | asmlinkage long reboot(int magic1, int magic2, unsigned int cmd, void __user *arg) | |
79 | { | |
80 | int ret; | |
81 | if(cmd==LINUX_REBOOT_CMD_KEXEC) { | |
82 | /* We only trust the superuser with rebooting the system. */ | |
83 | if (!capable(CAP_SYS_BOOT)) | |
84 | return -EPERM; | |
85 | ||
86 | /* For safety, we require "magic" arguments. */ | |
87 | if (magic1 != LINUX_REBOOT_MAGIC1 || | |
88 | (magic2 != LINUX_REBOOT_MAGIC2 && | |
89 | magic2 != LINUX_REBOOT_MAGIC2A && | |
90 | magic2 != LINUX_REBOOT_MAGIC2B && | |
91 | magic2 != LINUX_REBOOT_MAGIC2C)) | |
92 | return -EINVAL; | |
93 | ||
94 | lock_kernel(); | |
95 | ret = kernel_kexec(); | |
96 | unlock_kernel(); | |
97 | return ret; | |
98 | } else { | |
99 | return original_reboot(magic1, magic2, cmd, arg); | |
100 | } | |
101 | } |