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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 void kernel_restart_prepare(char *cmd)
50 {
51 #warning assuming kernel_restart_prepare is at 0xc00779cc
52 void (*original_kernel_restart_prepare)(char *) = (void (*)(char *))0xc00779cc;
53 return original_kernel_restart_prepare(cmd);
54 }
55
56 /*
57 * Reboot system call: for obvious reasons only root may call it,
58 * and even root needs to set up some magic numbers in the registers
59 * so that some mistake won't make this reboot the whole machine.
60 * You can also set the meaning of the ctrl-alt-del-key here.
61 *
62 * reboot doesn't sync: do that yourself before calling this.
63 */
64 asmlinkage long reboot(int magic1, int magic2, unsigned int cmd, void __user *arg)
65 {
66 int ret;
67 if(cmd==LINUX_REBOOT_CMD_KEXEC) {
68 /* We only trust the superuser with rebooting the system. */
69 if (!capable(CAP_SYS_BOOT))
70 return -EPERM;
71
72 /* For safety, we require "magic" arguments. */
73 if (magic1 != LINUX_REBOOT_MAGIC1 ||
74 (magic2 != LINUX_REBOOT_MAGIC2 &&
75 magic2 != LINUX_REBOOT_MAGIC2A &&
76 magic2 != LINUX_REBOOT_MAGIC2B &&
77 magic2 != LINUX_REBOOT_MAGIC2C))
78 return -EINVAL;
79
80 lock_kernel();
81 ret = kernel_kexec();
82 unlock_kernel();
83 return ret;
84 } else {
85 return original_reboot(magic1, magic2, cmd, arg);
86 }
87 }
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