projects / ms2-kexec / blame
| Commit | Line | Data |
|---|---|---|
| 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 | ||
| 4e93cb00 MG |
49 | void kernel_restart_prepare(char *cmd) |
| 50 | { | |
| 564905af MG |
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); | |
| 4e93cb00 MG |
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 | } |