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4e93cb00 MG |
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 | ||
76b7ce1b | 49 | #if 1 |
a16260b8 MG |
50 | static struct notifier_block dummy_notifier_reboot = { |
51 | .notifier_call = NULL, | |
52 | .next = NULL, | |
53 | .priority = INT_MAX | |
54 | }; | |
55 | ||
56 | BLOCKING_NOTIFIER_HEAD(notifier_head); | |
4f5f5319 | 57 | #endif |
a16260b8 MG |
58 | |
59 | ||
4e93cb00 MG |
60 | void kernel_restart_prepare(char *cmd) |
61 | { | |
76b7ce1b | 62 | #if 0 |
37bd435c MG |
63 | #warning assuming kernel_restart_prepare is at 0xc00779cc |
64 | void (*original_kernel_restart_prepare)(char *) = (void (*)(char *))0xc00779cc; | |
65 | //void (*original_kernel_restart_prepare)(char *) = (void (*)(char *))KERNEL_RESTART_PREPARE; | |
4f5f5319 | 66 | return original_kernel_restart_prepare(cmd); |
76b7ce1b | 67 | #else |
a16260b8 MG |
68 | register_reboot_notifier(&dummy_notifier_reboot); |
69 | notifier_head.head=dummy_notifier_reboot.next; | |
70 | unregister_reboot_notifier(&dummy_notifier_reboot); | |
71 | ||
72 | blocking_notifier_call_chain(¬ifier_head, SYS_RESTART, cmd); | |
73 | system_state = SYSTEM_RESTART; | |
1109a23f MG |
74 | //device_shutdown(); |
75 | //sysdev_shutdown(); | |
4f5f5319 | 76 | #endif |
4e93cb00 MG |
77 | } |
78 | ||
79 | /* | |
80 | * Reboot system call: for obvious reasons only root may call it, | |
81 | * and even root needs to set up some magic numbers in the registers | |
82 | * so that some mistake won't make this reboot the whole machine. | |
83 | * You can also set the meaning of the ctrl-alt-del-key here. | |
84 | * | |
85 | * reboot doesn't sync: do that yourself before calling this. | |
86 | */ | |
87 | asmlinkage long reboot(int magic1, int magic2, unsigned int cmd, void __user *arg) | |
88 | { | |
89 | int ret; | |
90 | if(cmd==LINUX_REBOOT_CMD_KEXEC) { | |
91 | /* We only trust the superuser with rebooting the system. */ | |
92 | if (!capable(CAP_SYS_BOOT)) | |
93 | return -EPERM; | |
94 | ||
95 | /* For safety, we require "magic" arguments. */ | |
96 | if (magic1 != LINUX_REBOOT_MAGIC1 || | |
97 | (magic2 != LINUX_REBOOT_MAGIC2 && | |
98 | magic2 != LINUX_REBOOT_MAGIC2A && | |
99 | magic2 != LINUX_REBOOT_MAGIC2B && | |
100 | magic2 != LINUX_REBOOT_MAGIC2C)) | |
101 | return -EINVAL; | |
102 | ||
103 | lock_kernel(); | |
104 | ret = kernel_kexec(); | |
105 | unlock_kernel(); | |
106 | return ret; | |
107 | } else { | |
108 | return original_reboot(magic1, magic2, cmd, arg); | |
109 | } | |
110 | } |