1 files changed, 399 insertions, 477 deletions

diff --git a/kernel/sys.c b/kernel/sys.c
index 241507f23eca..c18ecca575b4 100644
--- a/kernel/sys.c
+++ b/kernel/sys.c
@@ -47,6 +47,12 @@
 #include <linux/syscalls.h>
 #include <linux/kprobes.h>
 #include <linux/user_namespace.h>
+#include <linux/binfmts.h>
+
+#include <linux/sched.h>
+#include <linux/rcupdate.h>
+#include <linux/uidgid.h>
+#include <linux/cred.h>
 
 #include <linux/kmsg_dump.h>
 /* Move somewhere else to avoid recompiling? */
@@ -110,20 +116,6 @@ EXPORT_SYMBOL(fs_overflowuid);
 EXPORT_SYMBOL(fs_overflowgid);
 
 /*
- * this indicates whether you can reboot with ctrl-alt-del: the default is yes
- */
-
-int C_A_D = 1;
-struct pid *cad_pid;
-EXPORT_SYMBOL(cad_pid);
-
-/*
- * If set, this is used for preparing the system to power off.
- */
-
-void (*pm_power_off_prepare)(void);
-
-/*
  * Returns true if current's euid is same as p's uid or euid,
  * or has CAP_SYS_NICE to p's user_ns.
  *
@@ -302,240 +294,6 @@ out_unlock:
 	return retval;
 }
 
-/**
- *	emergency_restart - reboot the system
- *
- *	Without shutting down any hardware or taking any locks
- *	reboot the system.  This is called when we know we are in
- *	trouble so this is our best effort to reboot.  This is
- *	safe to call in interrupt context.
- */
-void emergency_restart(void)
-{
-	kmsg_dump(KMSG_DUMP_EMERG);
-	machine_emergency_restart();
-}
-EXPORT_SYMBOL_GPL(emergency_restart);
-
-void kernel_restart_prepare(char *cmd)
-{
-	blocking_notifier_call_chain(&reboot_notifier_list, SYS_RESTART, cmd);
-	system_state = SYSTEM_RESTART;
-	usermodehelper_disable();
-	device_shutdown();
-	syscore_shutdown();
-}
-
-/**
- *	register_reboot_notifier - Register function to be called at reboot time
- *	@nb: Info about notifier function to be called
- *
- *	Registers a function with the list of functions
- *	to be called at reboot time.
- *
- *	Currently always returns zero, as blocking_notifier_chain_register()
- *	always returns zero.
- */
-int register_reboot_notifier(struct notifier_block *nb)
-{
-	return blocking_notifier_chain_register(&reboot_notifier_list, nb);
-}
-EXPORT_SYMBOL(register_reboot_notifier);
-
-/**
- *	unregister_reboot_notifier - Unregister previously registered reboot notifier
- *	@nb: Hook to be unregistered
- *
- *	Unregisters a previously registered reboot
- *	notifier function.
- *
- *	Returns zero on success, or %-ENOENT on failure.
- */
-int unregister_reboot_notifier(struct notifier_block *nb)
-{
-	return blocking_notifier_chain_unregister(&reboot_notifier_list, nb);
-}
-EXPORT_SYMBOL(unregister_reboot_notifier);
-
-/**
- *	kernel_restart - reboot the system
- *	@cmd: pointer to buffer containing command to execute for restart
- *		or %NULL
- *
- *	Shutdown everything and perform a clean reboot.
- *	This is not safe to call in interrupt context.
- */
-void kernel_restart(char *cmd)
-{
-	kernel_restart_prepare(cmd);
-	if (!cmd)
-		printk(KERN_EMERG "Restarting system.\n");
-	else
-		printk(KERN_EMERG "Restarting system with command '%s'.\n", cmd);
-	kmsg_dump(KMSG_DUMP_RESTART);
-	machine_restart(cmd);
-}
-EXPORT_SYMBOL_GPL(kernel_restart);
-
-static void kernel_shutdown_prepare(enum system_states state)
-{
-	blocking_notifier_call_chain(&reboot_notifier_list,
-		(state == SYSTEM_HALT)?SYS_HALT:SYS_POWER_OFF, NULL);
-	system_state = state;
-	usermodehelper_disable();
-	device_shutdown();
-}
-/**
- *	kernel_halt - halt the system
- *
- *	Shutdown everything and perform a clean system halt.
- */
-void kernel_halt(void)
-{
-	kernel_shutdown_prepare(SYSTEM_HALT);
-	syscore_shutdown();
-	printk(KERN_EMERG "System halted.\n");
-	kmsg_dump(KMSG_DUMP_HALT);
-	machine_halt();
-}
-
-EXPORT_SYMBOL_GPL(kernel_halt);
-
-/**
- *	kernel_power_off - power_off the system
- *
- *	Shutdown everything and perform a clean system power_off.
- */
-void kernel_power_off(void)
-{
-	kernel_shutdown_prepare(SYSTEM_POWER_OFF);
-	if (pm_power_off_prepare)
-		pm_power_off_prepare();
-	disable_nonboot_cpus();
-	syscore_shutdown();
-	printk(KERN_EMERG "Power down.\n");
-	kmsg_dump(KMSG_DUMP_POWEROFF);
-	machine_power_off();
-}
-EXPORT_SYMBOL_GPL(kernel_power_off);
-
-static DEFINE_MUTEX(reboot_mutex);
-
-/*
- * Reboot system call: for obvious reasons only root may call it,
- * and even root needs to set up some magic numbers in the registers
- * so that some mistake won't make this reboot the whole machine.
- * You can also set the meaning of the ctrl-alt-del-key here.
- *
- * reboot doesn't sync: do that yourself before calling this.
- */
-SYSCALL_DEFINE4(reboot, int, magic1, int, magic2, unsigned int, cmd,
-		void __user *, arg)
-{
-	char buffer[256];
-	int ret = 0;
-
-	/* We only trust the superuser with rebooting the system. */
-	if (!capable(CAP_SYS_BOOT))
-		return -EPERM;
-
-	/* For safety, we require "magic" arguments. */
-	if (magic1 != LINUX_REBOOT_MAGIC1 ||
-	    (magic2 != LINUX_REBOOT_MAGIC2 &&
-	                magic2 != LINUX_REBOOT_MAGIC2A &&
-			magic2 != LINUX_REBOOT_MAGIC2B &&
-	                magic2 != LINUX_REBOOT_MAGIC2C))
-		return -EINVAL;
-
-	/*
-	 * If pid namespaces are enabled and the current task is in a child
-	 * pid_namespace, the command is handled by reboot_pid_ns() which will
-	 * call do_exit().
-	 */
-	ret = reboot_pid_ns(task_active_pid_ns(current), cmd);
-	if (ret)
-		return ret;
-
-	/* Instead of trying to make the power_off code look like
-	 * halt when pm_power_off is not set do it the easy way.
-	 */
-	if ((cmd == LINUX_REBOOT_CMD_POWER_OFF) && !pm_power_off)
-		cmd = LINUX_REBOOT_CMD_HALT;
-
-	mutex_lock(&reboot_mutex);
-	switch (cmd) {
-	case LINUX_REBOOT_CMD_RESTART:
-		kernel_restart(NULL);
-		break;
-
-	case LINUX_REBOOT_CMD_CAD_ON:
-		C_A_D = 1;
-		break;
-
-	case LINUX_REBOOT_CMD_CAD_OFF:
-		C_A_D = 0;
-		break;
-
-	case LINUX_REBOOT_CMD_HALT:
-		kernel_halt();
-		do_exit(0);
-		panic("cannot halt");
-
-	case LINUX_REBOOT_CMD_POWER_OFF:
-		kernel_power_off();
-		do_exit(0);
-		break;
-
-	case LINUX_REBOOT_CMD_RESTART2:
-		if (strncpy_from_user(&buffer[0], arg, sizeof(buffer) - 1) < 0) {
-			ret = -EFAULT;
-			break;
-		}
-		buffer[sizeof(buffer) - 1] = '\0';
-
-		kernel_restart(buffer);
-		break;
-
-#ifdef CONFIG_KEXEC
-	case LINUX_REBOOT_CMD_KEXEC:
-		ret = kernel_kexec();
-		break;
-#endif
-
-#ifdef CONFIG_HIBERNATION
-	case LINUX_REBOOT_CMD_SW_SUSPEND:
-		ret = hibernate();
-		break;
-#endif
-
-	default:
-		ret = -EINVAL;
-		break;
-	}
-	mutex_unlock(&reboot_mutex);
-	return ret;
-}
-
-static void deferred_cad(struct work_struct *dummy)
-{
-	kernel_restart(NULL);
-}
-
-/*
- * This function gets called by ctrl-alt-del - ie the keyboard interrupt.
- * As it's called within an interrupt, it may NOT sync: the only choice
- * is whether to reboot at once, or just ignore the ctrl-alt-del.
- */
-void ctrl_alt_del(void)
-{
-	static DECLARE_WORK(cad_work, deferred_cad);
-
-	if (C_A_D)
-		schedule_work(&cad_work);
-	else
-		kill_cad_pid(SIGINT, 1);
-}
-	
 /*
  * Unprivileged users may change the real gid to the effective gid
  * or vice versa.  (BSD-style)
@@ -579,7 +337,7 @@ SYSCALL_DEFINE2(setregid, gid_t, rgid, gid_t, egid)
 	if (rgid != (gid_t) -1) {
 		if (gid_eq(old->gid, krgid) ||
 		    gid_eq(old->egid, krgid) ||
-		    nsown_capable(CAP_SETGID))
+		    ns_capable(old->user_ns, CAP_SETGID))
 			new->gid = krgid;
 		else
 			goto error;
@@ -588,7 +346,7 @@ SYSCALL_DEFINE2(setregid, gid_t, rgid, gid_t, egid)
 		if (gid_eq(old->gid, kegid) ||
 		    gid_eq(old->egid, kegid) ||
 		    gid_eq(old->sgid, kegid) ||
-		    nsown_capable(CAP_SETGID))
+		    ns_capable(old->user_ns, CAP_SETGID))
 			new->egid = kegid;
 		else
 			goto error;
@@ -629,7 +387,7 @@ SYSCALL_DEFINE1(setgid, gid_t, gid)
 	old = current_cred();
 
 	retval = -EPERM;
-	if (nsown_capable(CAP_SETGID))
+	if (ns_capable(old->user_ns, CAP_SETGID))
 		new->gid = new->egid = new->sgid = new->fsgid = kgid;
 	else if (gid_eq(kgid, old->gid) || gid_eq(kgid, old->sgid))
 		new->egid = new->fsgid = kgid;
@@ -713,7 +471,7 @@ SYSCALL_DEFINE2(setreuid, uid_t, ruid, uid_t, euid)
 		new->uid = kruid;
 		if (!uid_eq(old->uid, kruid) &&
 		    !uid_eq(old->euid, kruid) &&
-		    !nsown_capable(CAP_SETUID))
+		    !ns_capable(old->user_ns, CAP_SETUID))
 			goto error;
 	}
 
@@ -722,7 +480,7 @@ SYSCALL_DEFINE2(setreuid, uid_t, ruid, uid_t, euid)
 		if (!uid_eq(old->uid, keuid) &&
 		    !uid_eq(old->euid, keuid) &&
 		    !uid_eq(old->suid, keuid) &&
-		    !nsown_capable(CAP_SETUID))
+		    !ns_capable(old->user_ns, CAP_SETUID))
 			goto error;
 	}
 
@@ -776,7 +534,7 @@ SYSCALL_DEFINE1(setuid, uid_t, uid)
 	old = current_cred();
 
 	retval = -EPERM;
-	if (nsown_capable(CAP_SETUID)) {
+	if (ns_capable(old->user_ns, CAP_SETUID)) {
 		new->suid = new->uid = kuid;
 		if (!uid_eq(kuid, old->uid)) {
 			retval = set_user(new);
@@ -833,7 +591,7 @@ SYSCALL_DEFINE3(setresuid, uid_t, ruid, uid_t, euid, uid_t, suid)
 	old = current_cred();
 
 	retval = -EPERM;
-	if (!nsown_capable(CAP_SETUID)) {
+	if (!ns_capable(old->user_ns, CAP_SETUID)) {
 		if (ruid != (uid_t) -1        && !uid_eq(kruid, old->uid) &&
 		    !uid_eq(kruid, old->euid) && !uid_eq(kruid, old->suid))
 			goto error;
@@ -915,7 +673,7 @@ SYSCALL_DEFINE3(setresgid, gid_t, rgid, gid_t, egid, gid_t, sgid)
 	old = current_cred();
 
 	retval = -EPERM;
-	if (!nsown_capable(CAP_SETGID)) {
+	if (!ns_capable(old->user_ns, CAP_SETGID)) {
 		if (rgid != (gid_t) -1        && !gid_eq(krgid, old->gid) &&
 		    !gid_eq(krgid, old->egid) && !gid_eq(krgid, old->sgid))
 			goto error;
@@ -986,7 +744,7 @@ SYSCALL_DEFINE1(setfsuid, uid_t, uid)
 
 	if (uid_eq(kuid, old->uid)  || uid_eq(kuid, old->euid)  ||
 	    uid_eq(kuid, old->suid) || uid_eq(kuid, old->fsuid) ||
-	    nsown_capable(CAP_SETUID)) {
+	    ns_capable(old->user_ns, CAP_SETUID)) {
 		if (!uid_eq(kuid, old->fsuid)) {
 			new->fsuid = kuid;
 			if (security_task_fix_setuid(new, old, LSM_SETID_FS) == 0)
@@ -1025,7 +783,7 @@ SYSCALL_DEFINE1(setfsgid, gid_t, gid)
 
 	if (gid_eq(kgid, old->gid)  || gid_eq(kgid, old->egid)  ||
 	    gid_eq(kgid, old->sgid) || gid_eq(kgid, old->fsgid) ||
-	    nsown_capable(CAP_SETGID)) {
+	    ns_capable(old->user_ns, CAP_SETGID)) {
 		if (!gid_eq(kgid, old->fsgid)) {
 			new->fsgid = kgid;
 			goto change_okay;
@@ -1040,12 +798,73 @@ change_okay:
 	return old_fsgid;
 }
 
+/**
+ * sys_getpid - return the thread group id of the current process
+ *
+ * Note, despite the name, this returns the tgid not the pid.  The tgid and
+ * the pid are identical unless CLONE_THREAD was specified on clone() in
+ * which case the tgid is the same in all threads of the same group.
+ *
+ * This is SMP safe as current->tgid does not change.
+ */
+SYSCALL_DEFINE0(getpid)
+{
+	return task_tgid_vnr(current);
+}
+
+/* Thread ID - the internal kernel "pid" */
+SYSCALL_DEFINE0(gettid)
+{
+	return task_pid_vnr(current);
+}
+
+/*
+ * Accessing ->real_parent is not SMP-safe, it could
+ * change from under us. However, we can use a stale
+ * value of ->real_parent under rcu_read_lock(), see
+ * release_task()->call_rcu(delayed_put_task_struct).
+ */
+SYSCALL_DEFINE0(getppid)
+{
+	int pid;
+
+	rcu_read_lock();
+	pid = task_tgid_vnr(rcu_dereference(current->real_parent));
+	rcu_read_unlock();
+
+	return pid;
+}
+
+SYSCALL_DEFINE0(getuid)
+{
+	/* Only we change this so SMP safe */
+	return from_kuid_munged(current_user_ns(), current_uid());
+}
+
+SYSCALL_DEFINE0(geteuid)
+{
+	/* Only we change this so SMP safe */
+	return from_kuid_munged(current_user_ns(), current_euid());
+}
+
+SYSCALL_DEFINE0(getgid)
+{
+	/* Only we change this so SMP safe */
+	return from_kgid_munged(current_user_ns(), current_gid());
+}
+
+SYSCALL_DEFINE0(getegid)
+{
+	/* Only we change this so SMP safe */
+	return from_kgid_munged(current_user_ns(), current_egid());
+}
+
 void do_sys_times(struct tms *tms)
 {
 	cputime_t tgutime, tgstime, cutime, cstime;
 
 	spin_lock_irq(&current->sighand->siglock);
-	thread_group_times(current, &tgutime, &tgstime);
+	thread_group_cputime_adjusted(current, &tgutime, &tgstime);
 	cutime = current->signal->cutime;
 	cstime = current->signal->cstime;
 	spin_unlock_irq(&current->sighand->siglock);
@@ -1216,6 +1035,17 @@ out:
 	return retval;
 }
 
+static void set_special_pids(struct pid *pid)
+{
+	struct task_struct *curr = current->group_leader;
+
+	if (task_session(curr) != pid)
+		change_pid(curr, PIDTYPE_SID, pid);
+
+	if (task_pgrp(curr) != pid)
+		change_pid(curr, PIDTYPE_PGID, pid);
+}
+
 SYSCALL_DEFINE0(setsid)
 {
 	struct task_struct *group_leader = current->group_leader;
@@ -1235,7 +1065,7 @@ SYSCALL_DEFINE0(setsid)
 		goto out;
 
 	group_leader->signal->leader = 1;
-	__set_special_pids(sid);
+	set_special_pids(sid);
 
 	proc_clear_tty(group_leader);
 
@@ -1264,15 +1094,16 @@ DECLARE_RWSEM(uts_sem);
  * Work around broken programs that cannot handle "Linux 3.0".
  * Instead we map 3.x to 2.6.40+x, so e.g. 3.0 would be 2.6.40
  */
-static int override_release(char __user *release, int len)
+static int override_release(char __user *release, size_t len)
 {
 	int ret = 0;
-	char buf[65];
 
 	if (current->personality & UNAME26) {
-		char *rest = UTS_RELEASE;
+		const char *rest = UTS_RELEASE;
+		char buf[65] = { 0 };
 		int ndots = 0;
 		unsigned v;
+		size_t copy;
 
 		while (*rest) {
 			if (*rest == '.' && ++ndots >= 3)
@@ -1282,8 +1113,9 @@ static int override_release(char __user *release, int len)
 			rest++;
 		}
 		v = ((LINUX_VERSION_CODE >> 8) & 0xff) + 40;
-		snprintf(buf, len, "2.6.%u%s", v, rest);
-		ret = copy_to_user(release, buf, len);
+		copy = clamp_t(size_t, len, 1, sizeof(buf));
+		copy = scnprintf(buf, copy, "2.6.%u%s", v, rest);
+		ret = copy_to_user(release, buf, copy + 1);
 	}
 	return ret;
 }
@@ -1701,7 +1533,7 @@ static void k_getrusage(struct task_struct *p, int who, struct rusage *r)
 	utime = stime = 0;
 
 	if (who == RUSAGE_THREAD) {
-		task_times(current, &utime, &stime);
+		task_cputime_adjusted(current, &utime, &stime);
 		accumulate_thread_rusage(p, r);
 		maxrss = p->signal->maxrss;
 		goto out;
@@ -1727,7 +1559,7 @@ static void k_getrusage(struct task_struct *p, int who, struct rusage *r)
 				break;
 
 		case RUSAGE_SELF:
-			thread_group_times(p, &tgutime, &tgstime);
+			thread_group_cputime_adjusted(p, &tgutime, &tgstime);
 			utime += tgutime;
 			stime += tgstime;
 			r->ru_nvcsw += p->signal->nvcsw;
@@ -1779,24 +1611,37 @@ SYSCALL_DEFINE2(getrusage, int, who, struct rusage __user *, ru)
 	return getrusage(current, who, ru);
 }
 
+#ifdef CONFIG_COMPAT
+COMPAT_SYSCALL_DEFINE2(getrusage, int, who, struct compat_rusage __user *, ru)
+{
+	struct rusage r;
+
+	if (who != RUSAGE_SELF && who != RUSAGE_CHILDREN &&
+	    who != RUSAGE_THREAD)
+		return -EINVAL;
+
+	k_getrusage(current, who, &r);
+	return put_compat_rusage(&r, ru);
+}
+#endif
+
 SYSCALL_DEFINE1(umask, int, mask)
 {
 	mask = xchg(&current->fs->umask, mask & S_IRWXUGO);
 	return mask;
 }
 
-#ifdef CONFIG_CHECKPOINT_RESTORE
 static int prctl_set_mm_exe_file(struct mm_struct *mm, unsigned int fd)
 {
-	struct file *exe_file;
-	struct dentry *dentry;
+	struct fd exe;
+	struct inode *inode;
 	int err;
 
-	exe_file = fget(fd);
-	if (!exe_file)
+	exe = fdget(fd);
+	if (!exe.file)
 		return -EBADF;
 
-	dentry = exe_file->f_path.dentry;
+	inode = file_inode(exe.file);
 
 	/*
 	 * Because the original mm->exe_file points to executable file, make
@@ -1804,11 +1649,11 @@ static int prctl_set_mm_exe_file(struct mm_struct *mm, unsigned int fd)
 	 * overall picture.
 	 */
 	err = -EACCES;
-	if (!S_ISREG(dentry->d_inode->i_mode)	||
-	    exe_file->f_path.mnt->mnt_flags & MNT_NOEXEC)
+	if (!S_ISREG(inode->i_mode)	||
+	    exe.file->f_path.mnt->mnt_flags & MNT_NOEXEC)
 		goto exit;
 
-	err = inode_permission(dentry->d_inode, MAY_EXEC);
+	err = inode_permission(inode, MAY_EXEC);
 	if (err)
 		goto exit;
 
@@ -1839,12 +1684,12 @@ static int prctl_set_mm_exe_file(struct mm_struct *mm, unsigned int fd)
 		goto exit_unlock;
 
 	err = 0;
-	set_mm_exe_file(mm, exe_file);
+	set_mm_exe_file(mm, exe.file);	/* this grabs a reference to exe.file */
 exit_unlock:
 	up_write(&mm->mmap_sem);
 
 exit:
-	fput(exe_file);
+	fdput(exe);
 	return err;
 }
 
@@ -1979,17 +1824,12 @@ out:
 	return error;
 }
 
+#ifdef CONFIG_CHECKPOINT_RESTORE
 static int prctl_get_tid_address(struct task_struct *me, int __user **tid_addr)
 {
 	return put_user(me->clear_child_tid, tid_addr);
 }
-
-#else /* CONFIG_CHECKPOINT_RESTORE */
-static int prctl_set_mm(int opt, unsigned long addr,
-			unsigned long arg4, unsigned long arg5)
-{
-	return -EINVAL;
-}
+#else
 static int prctl_get_tid_address(struct task_struct *me, int __user **tid_addr)
 {
 	return -EINVAL;
@@ -2009,160 +1849,159 @@ SYSCALL_DEFINE5(prctl, int, option, unsigned long, arg2, unsigned long, arg3,
 
 	error = 0;
 	switch (option) {
-		case PR_SET_PDEATHSIG:
-			if (!valid_signal(arg2)) {
-				error = -EINVAL;
-				break;
-			}
-			me->pdeath_signal = arg2;
-			break;
-		case PR_GET_PDEATHSIG:
-			error = put_user(me->pdeath_signal, (int __user *)arg2);
-			break;
-		case PR_GET_DUMPABLE:
-			error = get_dumpable(me->mm);
+	case PR_SET_PDEATHSIG:
+		if (!valid_signal(arg2)) {
+			error = -EINVAL;
 			break;
-		case PR_SET_DUMPABLE:
-			if (arg2 < 0 || arg2 > 1) {
-				error = -EINVAL;
-				break;
-			}
-			set_dumpable(me->mm, arg2);
+		}
+		me->pdeath_signal = arg2;
+		break;
+	case PR_GET_PDEATHSIG:
+		error = put_user(me->pdeath_signal, (int __user *)arg2);
+		break;
+	case PR_GET_DUMPABLE:
+		error = get_dumpable(me->mm);
+		break;
+	case PR_SET_DUMPABLE:
+		if (arg2 != SUID_DUMP_DISABLE && arg2 != SUID_DUMP_USER) {
+			error = -EINVAL;
 			break;
+		}
+		set_dumpable(me->mm, arg2);
+		break;
 
-		case PR_SET_UNALIGN:
-			error = SET_UNALIGN_CTL(me, arg2);
-			break;
-		case PR_GET_UNALIGN:
-			error = GET_UNALIGN_CTL(me, arg2);
-			break;
-		case PR_SET_FPEMU:
-			error = SET_FPEMU_CTL(me, arg2);
-			break;
-		case PR_GET_FPEMU:
-			error = GET_FPEMU_CTL(me, arg2);
-			break;
-		case PR_SET_FPEXC:
-			error = SET_FPEXC_CTL(me, arg2);
-			break;
-		case PR_GET_FPEXC:
-			error = GET_FPEXC_CTL(me, arg2);
-			break;
-		case PR_GET_TIMING:
-			error = PR_TIMING_STATISTICAL;
-			break;
-		case PR_SET_TIMING:
-			if (arg2 != PR_TIMING_STATISTICAL)
-				error = -EINVAL;
-			break;
-		case PR_SET_NAME:
-			comm[sizeof(me->comm)-1] = 0;
-			if (strncpy_from_user(comm, (char __user *)arg2,
-					      sizeof(me->comm) - 1) < 0)
-				return -EFAULT;
-			set_task_comm(me, comm);
-			proc_comm_connector(me);
-			break;
-		case PR_GET_NAME:
-			get_task_comm(comm, me);
-			if (copy_to_user((char __user *)arg2, comm,
-					 sizeof(comm)))
-				return -EFAULT;
-			break;
-		case PR_GET_ENDIAN:
-			error = GET_ENDIAN(me, arg2);
-			break;
-		case PR_SET_ENDIAN:
-			error = SET_ENDIAN(me, arg2);
-			break;
-		case PR_GET_SECCOMP:
-			error = prctl_get_seccomp();
-			break;
-		case PR_SET_SECCOMP:
-			error = prctl_set_seccomp(arg2, (char __user *)arg3);
-			break;
-		case PR_GET_TSC:
-			error = GET_TSC_CTL(arg2);
-			break;
-		case PR_SET_TSC:
-			error = SET_TSC_CTL(arg2);
-			break;
-		case PR_TASK_PERF_EVENTS_DISABLE:
-			error = perf_event_task_disable();
-			break;
-		case PR_TASK_PERF_EVENTS_ENABLE:
-			error = perf_event_task_enable();
-			break;
-		case PR_GET_TIMERSLACK:
-			error = current->timer_slack_ns;
-			break;
-		case PR_SET_TIMERSLACK:
-			if (arg2 <= 0)
-				current->timer_slack_ns =
+	case PR_SET_UNALIGN:
+		error = SET_UNALIGN_CTL(me, arg2);
+		break;
+	case PR_GET_UNALIGN:
+		error = GET_UNALIGN_CTL(me, arg2);
+		break;
+	case PR_SET_FPEMU:
+		error = SET_FPEMU_CTL(me, arg2);
+		break;
+	case PR_GET_FPEMU:
+		error = GET_FPEMU_CTL(me, arg2);
+		break;
+	case PR_SET_FPEXC:
+		error = SET_FPEXC_CTL(me, arg2);
+		break;
+	case PR_GET_FPEXC:
+		error = GET_FPEXC_CTL(me, arg2);
+		break;
+	case PR_GET_TIMING:
+		error = PR_TIMING_STATISTICAL;
+		break;
+	case PR_SET_TIMING:
+		if (arg2 != PR_TIMING_STATISTICAL)
+			error = -EINVAL;
+		break;
+	case PR_SET_NAME:
+		comm[sizeof(me->comm) - 1] = 0;
+		if (strncpy_from_user(comm, (char __user *)arg2,
+				      sizeof(me->comm) - 1) < 0)
+			return -EFAULT;
+		set_task_comm(me, comm);
+		proc_comm_connector(me);
+		break;
+	case PR_GET_NAME:
+		get_task_comm(comm, me);
+		if (copy_to_user((char __user *)arg2, comm, sizeof(comm)))
+			return -EFAULT;
+		break;
+	case PR_GET_ENDIAN:
+		error = GET_ENDIAN(me, arg2);
+		break;
+	case PR_SET_ENDIAN:
+		error = SET_ENDIAN(me, arg2);
+		break;
+	case PR_GET_SECCOMP:
+		error = prctl_get_seccomp();
+		break;
+	case PR_SET_SECCOMP:
+		error = prctl_set_seccomp(arg2, (char __user *)arg3);
+		break;
+	case PR_GET_TSC:
+		error = GET_TSC_CTL(arg2);
+		break;
+	case PR_SET_TSC:
+		error = SET_TSC_CTL(arg2);
+		break;
+	case PR_TASK_PERF_EVENTS_DISABLE:
+		error = perf_event_task_disable();
+		break;
+	case PR_TASK_PERF_EVENTS_ENABLE:
+		error = perf_event_task_enable();
+		break;
+	case PR_GET_TIMERSLACK:
+		error = current->timer_slack_ns;
+		break;
+	case PR_SET_TIMERSLACK:
+		if (arg2 <= 0)
+			current->timer_slack_ns =
 					current->default_timer_slack_ns;
-			else
-				current->timer_slack_ns = arg2;
-			break;
-		case PR_MCE_KILL:
-			if (arg4 | arg5)
-				return -EINVAL;
-			switch (arg2) {
-			case PR_MCE_KILL_CLEAR:
-				if (arg3 != 0)
-					return -EINVAL;
-				current->flags &= ~PF_MCE_PROCESS;
-				break;
-			case PR_MCE_KILL_SET:
-				current->flags |= PF_MCE_PROCESS;
-				if (arg3 == PR_MCE_KILL_EARLY)
-					current->flags |= PF_MCE_EARLY;
-				else if (arg3 == PR_MCE_KILL_LATE)
-					current->flags &= ~PF_MCE_EARLY;
-				else if (arg3 == PR_MCE_KILL_DEFAULT)
-					current->flags &=
-						~(PF_MCE_EARLY|PF_MCE_PROCESS);
-				else
-					return -EINVAL;
-				break;
-			default:
+		else
+			current->timer_slack_ns = arg2;
+		break;
+	case PR_MCE_KILL:
+		if (arg4 | arg5)
+			return -EINVAL;
+		switch (arg2) {
+		case PR_MCE_KILL_CLEAR:
+			if (arg3 != 0)
 				return -EINVAL;
-			}
+			current->flags &= ~PF_MCE_PROCESS;
 			break;
-		case PR_MCE_KILL_GET:
-			if (arg2 | arg3 | arg4 | arg5)
-				return -EINVAL;
-			if (current->flags & PF_MCE_PROCESS)
-				error = (current->flags & PF_MCE_EARLY) ?
-					PR_MCE_KILL_EARLY : PR_MCE_KILL_LATE;
+		case PR_MCE_KILL_SET:
+			current->flags |= PF_MCE_PROCESS;
+			if (arg3 == PR_MCE_KILL_EARLY)
+				current->flags |= PF_MCE_EARLY;
+			else if (arg3 == PR_MCE_KILL_LATE)
+				current->flags &= ~PF_MCE_EARLY;
+			else if (arg3 == PR_MCE_KILL_DEFAULT)
+				current->flags &=
+						~(PF_MCE_EARLY|PF_MCE_PROCESS);
 			else
-				error = PR_MCE_KILL_DEFAULT;
-			break;
-		case PR_SET_MM:
-			error = prctl_set_mm(arg2, arg3, arg4, arg5);
-			break;
-		case PR_GET_TID_ADDRESS:
-			error = prctl_get_tid_address(me, (int __user **)arg2);
-			break;
-		case PR_SET_CHILD_SUBREAPER:
-			me->signal->is_child_subreaper = !!arg2;
-			break;
-		case PR_GET_CHILD_SUBREAPER:
-			error = put_user(me->signal->is_child_subreaper,
-					 (int __user *) arg2);
-			break;
-		case PR_SET_NO_NEW_PRIVS:
-			if (arg2 != 1 || arg3 || arg4 || arg5)
 				return -EINVAL;
-
-			current->no_new_privs = 1;
 			break;
-		case PR_GET_NO_NEW_PRIVS:
-			if (arg2 || arg3 || arg4 || arg5)
-				return -EINVAL;
-			return current->no_new_privs ? 1 : 0;
 		default:
-			error = -EINVAL;
-			break;
+			return -EINVAL;
+		}
+		break;
+	case PR_MCE_KILL_GET:
+		if (arg2 | arg3 | arg4 | arg5)
+			return -EINVAL;
+		if (current->flags & PF_MCE_PROCESS)
+			error = (current->flags & PF_MCE_EARLY) ?
+				PR_MCE_KILL_EARLY : PR_MCE_KILL_LATE;
+		else
+			error = PR_MCE_KILL_DEFAULT;
+		break;
+	case PR_SET_MM:
+		error = prctl_set_mm(arg2, arg3, arg4, arg5);
+		break;
+	case PR_GET_TID_ADDRESS:
+		error = prctl_get_tid_address(me, (int __user **)arg2);
+		break;
+	case PR_SET_CHILD_SUBREAPER:
+		me->signal->is_child_subreaper = !!arg2;
+		break;
+	case PR_GET_CHILD_SUBREAPER:
+		error = put_user(me->signal->is_child_subreaper,
+				 (int __user *)arg2);
+		break;
+	case PR_SET_NO_NEW_PRIVS:
+		if (arg2 != 1 || arg3 || arg4 || arg5)
+			return -EINVAL;
+
+		current->no_new_privs = 1;
+		break;
+	case PR_GET_NO_NEW_PRIVS:
+		if (arg2 || arg3 || arg4 || arg5)
+			return -EINVAL;
+		return current->no_new_privs ? 1 : 0;
+	default:
+		error = -EINVAL;
+		break;
 	}
 	return error;
 }
@@ -2179,63 +2018,146 @@ SYSCALL_DEFINE3(getcpu, unsigned __user *, cpup, unsigned __user *, nodep,
 	return err ? -EFAULT : 0;
 }
 
-char poweroff_cmd[POWEROFF_CMD_PATH_LEN] = "/sbin/poweroff";
-
-static void argv_cleanup(struct subprocess_info *info)
+/**
+ * do_sysinfo - fill in sysinfo struct
+ * @info: pointer to buffer to fill
+ */
+static int do_sysinfo(struct sysinfo *info)
 {
-	argv_free(info->argv);
-}
+	unsigned long mem_total, sav_total;
+	unsigned int mem_unit, bitcount;
+	struct timespec tp;
 
-static int __orderly_poweroff(void)
-{
-	int argc;
-	char **argv;
-	static char *envp[] = {
-		"HOME=/",
-		"PATH=/sbin:/bin:/usr/sbin:/usr/bin",
-		NULL
-	};
-	int ret;
+	memset(info, 0, sizeof(struct sysinfo));
 
-	argv = argv_split(GFP_ATOMIC, poweroff_cmd, &argc);
-	if (argv == NULL) {
-		printk(KERN_WARNING "%s failed to allocate memory for \"%s\"\n",
-		       __func__, poweroff_cmd);
-		return -ENOMEM;
+	get_monotonic_boottime(&tp);
+	info->uptime = tp.tv_sec + (tp.tv_nsec ? 1 : 0);
+
+	get_avenrun(info->loads, 0, SI_LOAD_SHIFT - FSHIFT);
+
+	info->procs = nr_threads;
+
+	si_meminfo(info);
+	si_swapinfo(info);
+
+	/*
+	 * If the sum of all the available memory (i.e. ram + swap)
+	 * is less than can be stored in a 32 bit unsigned long then
+	 * we can be binary compatible with 2.2.x kernels.  If not,
+	 * well, in that case 2.2.x was broken anyways...
+	 *
+	 *  -Erik Andersen <andersee@debian.org>
+	 */
+
+	mem_total = info->totalram + info->totalswap;
+	if (mem_total < info->totalram || mem_total < info->totalswap)
+		goto out;
+	bitcount = 0;
+	mem_unit = info->mem_unit;
+	while (mem_unit > 1) {
+		bitcount++;
+		mem_unit >>= 1;
+		sav_total = mem_total;
+		mem_total <<= 1;
+		if (mem_total < sav_total)
+			goto out;
 	}
 
-	ret = call_usermodehelper_fns(argv[0], argv, envp, UMH_NO_WAIT,
-				      NULL, argv_cleanup, NULL);
-	if (ret == -ENOMEM)
-		argv_free(argv);
+	/*
+	 * If mem_total did not overflow, multiply all memory values by
+	 * info->mem_unit and set it to 1.  This leaves things compatible
+	 * with 2.2.x, and also retains compatibility with earlier 2.4.x
+	 * kernels...
+	 */
 
-	return ret;
+	info->mem_unit = 1;
+	info->totalram <<= bitcount;
+	info->freeram <<= bitcount;
+	info->sharedram <<= bitcount;
+	info->bufferram <<= bitcount;
+	info->totalswap <<= bitcount;
+	info->freeswap <<= bitcount;
+	info->totalhigh <<= bitcount;
+	info->freehigh <<= bitcount;
+
+out:
+	return 0;
 }
 
-/**
- * orderly_poweroff - Trigger an orderly system poweroff
- * @force: force poweroff if command execution fails
- *
- * This may be called from any context to trigger a system shutdown.
- * If the orderly shutdown fails, it will force an immediate shutdown.
- */
-int orderly_poweroff(bool force)
+SYSCALL_DEFINE1(sysinfo, struct sysinfo __user *, info)
 {
-	int ret = __orderly_poweroff();
-
-	if (ret && force) {
-		printk(KERN_WARNING "Failed to start orderly shutdown: "
-		       "forcing the issue\n");
-
-		/*
-		 * I guess this should try to kick off some daemon to sync and
-		 * poweroff asap.  Or not even bother syncing if we're doing an
-		 * emergency shutdown?
-		 */
-		emergency_sync();
-		kernel_power_off();
+	struct sysinfo val;
+
+	do_sysinfo(&val);
+
+	if (copy_to_user(info, &val, sizeof(struct sysinfo)))
+		return -EFAULT;
+
+	return 0;
+}
+
+#ifdef CONFIG_COMPAT
+struct compat_sysinfo {
+	s32 uptime;
+	u32 loads[3];
+	u32 totalram;
+	u32 freeram;
+	u32 sharedram;
+	u32 bufferram;
+	u32 totalswap;
+	u32 freeswap;
+	u16 procs;
+	u16 pad;
+	u32 totalhigh;
+	u32 freehigh;
+	u32 mem_unit;
+	char _f[20-2*sizeof(u32)-sizeof(int)];
+};
+
+COMPAT_SYSCALL_DEFINE1(sysinfo, struct compat_sysinfo __user *, info)
+{
+	struct sysinfo s;
+
+	do_sysinfo(&s);
+
+	/* Check to see if any memory value is too large for 32-bit and scale
+	 *  down if needed
+	 */
+	if ((s.totalram >> 32) || (s.totalswap >> 32)) {
+		int bitcount = 0;
+
+		while (s.mem_unit < PAGE_SIZE) {
+			s.mem_unit <<= 1;
+			bitcount++;
+		}
+
+		s.totalram >>= bitcount;
+		s.freeram >>= bitcount;
+		s.sharedram >>= bitcount;
+		s.bufferram >>= bitcount;
+		s.totalswap >>= bitcount;
+		s.freeswap >>= bitcount;
+		s.totalhigh >>= bitcount;
+		s.freehigh >>= bitcount;
 	}
 
-	return ret;
+	if (!access_ok(VERIFY_WRITE, info, sizeof(struct compat_sysinfo)) ||
+	    __put_user(s.uptime, &info->uptime) ||
+	    __put_user(s.loads[0], &info->loads[0]) ||
+	    __put_user(s.loads[1], &info->loads[1]) ||
+	    __put_user(s.loads[2], &info->loads[2]) ||
+	    __put_user(s.totalram, &info->totalram) ||
+	    __put_user(s.freeram, &info->freeram) ||
+	    __put_user(s.sharedram, &info->sharedram) ||
+	    __put_user(s.bufferram, &info->bufferram) ||
+	    __put_user(s.totalswap, &info->totalswap) ||
+	    __put_user(s.freeswap, &info->freeswap) ||
+	    __put_user(s.procs, &info->procs) ||
+	    __put_user(s.totalhigh, &info->totalhigh) ||
+	    __put_user(s.freehigh, &info->freehigh) ||
+	    __put_user(s.mem_unit, &info->mem_unit))
+		return -EFAULT;
+
+	return 0;
 }
-EXPORT_SYMBOL_GPL(orderly_poweroff);
+#endif /* CONFIG_COMPAT */