1 files changed, 53 insertions, 47 deletions

diff --git a/kernel/sys.c b/kernel/sys.c
index eecf84526afe..0929c698affc 100644
--- a/kernel/sys.c
+++ b/kernel/sys.c
@@ -19,6 +19,7 @@
 #include <linux/kernel.h>
 #include <linux/kexec.h>
 #include <linux/workqueue.h>
+#include <linux/capability.h>
 #include <linux/device.h>
 #include <linux/key.h>
 #include <linux/times.h>
@@ -223,6 +224,18 @@ int unregister_reboot_notifier(struct notifier_block * nb)
 
 EXPORT_SYMBOL(unregister_reboot_notifier);
 
+#ifndef CONFIG_SECURITY
+int capable(int cap)
+{
+        if (cap_raised(current->cap_effective, cap)) {
+               current->flags |= PF_SUPERPRIV;
+               return 1;
+        }
+        return 0;
+}
+EXPORT_SYMBOL(capable);
+#endif
+
 static int set_one_prio(struct task_struct *p, int niceval, int error)
 {
         int no_nice;
@@ -427,23 +440,25 @@ void kernel_kexec(void)
 }
 EXPORT_SYMBOL_GPL(kernel_kexec);
 
+void kernel_shutdown_prepare(enum system_states state)
+{
+        notifier_call_chain(&reboot_notifier_list,
+                (state == SYSTEM_HALT)?SYS_HALT:SYS_POWER_OFF, NULL);
+        system_state = state;
+        device_shutdown();
+}
 /**
  *      kernel_halt - halt the system
  *
  *      Shutdown everything and perform a clean system halt.
  */
-void kernel_halt_prepare(void)
-{
-        notifier_call_chain(&reboot_notifier_list, SYS_HALT, NULL);
-        system_state = SYSTEM_HALT;
-        device_shutdown();
-}
 void kernel_halt(void)
 {
-        kernel_halt_prepare();
+        kernel_shutdown_prepare(SYSTEM_HALT);
         printk(KERN_EMERG "System halted.\n");
         machine_halt();
 }
+
 EXPORT_SYMBOL_GPL(kernel_halt);
 
 /**
@@ -451,20 +466,13 @@ EXPORT_SYMBOL_GPL(kernel_halt);
  *
  *      Shutdown everything and perform a clean system power_off.
  */
-void kernel_power_off_prepare(void)
-{
-        notifier_call_chain(&reboot_notifier_list, SYS_POWER_OFF, NULL);
-        system_state = SYSTEM_POWER_OFF;
-        device_shutdown();
-}
 void kernel_power_off(void)
 {
-        kernel_power_off_prepare();
+        kernel_shutdown_prepare(SYSTEM_POWER_OFF);
         printk(KERN_EMERG "Power down.\n");
         machine_power_off();
 }
 EXPORT_SYMBOL_GPL(kernel_power_off);
-
 /*
  * Reboot system call: for obvious reasons only root may call it,
  * and even root needs to set up some magic numbers in the registers
@@ -489,6 +497,12 @@ asmlinkage long sys_reboot(int magic1, int magic2, unsigned int cmd, void __user
                         magic2 != LINUX_REBOOT_MAGIC2C))
                 return -EINVAL;
 
+        /* 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;
+
         lock_kernel();
         switch (cmd) {
         case LINUX_REBOOT_CMD_RESTART:
@@ -1084,10 +1098,11 @@ asmlinkage long sys_times(struct tms __user * tbuf)
 asmlinkage long sys_setpgid(pid_t pid, pid_t pgid)
 {
         struct task_struct *p;
+        struct task_struct *group_leader = current->group_leader;
         int err = -EINVAL;
 
         if (!pid)
-                pid = current->pid;
+                pid = group_leader->pid;
         if (!pgid)
                 pgid = pid;
         if (pgid < 0)
@@ -1107,16 +1122,16 @@ asmlinkage long sys_setpgid(pid_t pid, pid_t pgid)
         if (!thread_group_leader(p))
                 goto out;
 
-        if (p->parent == current || p->real_parent == current) {
+        if (p->real_parent == group_leader) {
                 err = -EPERM;
-                if (p->signal->session != current->signal->session)
+                if (p->signal->session != group_leader->signal->session)
                         goto out;
                 err = -EACCES;
                 if (p->did_exec)
                         goto out;
         } else {
                 err = -ESRCH;
-                if (p != current)
+                if (p != group_leader)
                         goto out;
         }
 
@@ -1128,7 +1143,7 @@ asmlinkage long sys_setpgid(pid_t pid, pid_t pgid)
                 struct task_struct *p;
 
                 do_each_task_pid(pgid, PIDTYPE_PGID, p) {
-                        if (p->signal->session == current->signal->session)
+                        if (p->signal->session == group_leader->signal->session)
                                 goto ok_pgid;
                 } while_each_task_pid(pgid, PIDTYPE_PGID, p);
                 goto out;
@@ -1208,24 +1223,22 @@ asmlinkage long sys_getsid(pid_t pid)
 
 asmlinkage long sys_setsid(void)
 {
+        struct task_struct *group_leader = current->group_leader;
         struct pid *pid;
         int err = -EPERM;
 
-        if (!thread_group_leader(current))
-                return -EINVAL;
-
         down(&tty_sem);
         write_lock_irq(&tasklist_lock);
 
-        pid = find_pid(PIDTYPE_PGID, current->pid);
+        pid = find_pid(PIDTYPE_PGID, group_leader->pid);
         if (pid)
                 goto out;
 
-        current->signal->leader = 1;
-        __set_special_pids(current->pid, current->pid);
-        current->signal->tty = NULL;
-        current->signal->tty_old_pgrp = 0;
-        err = process_group(current);
+        group_leader->signal->leader = 1;
+        __set_special_pids(group_leader->pid, group_leader->pid);
+        group_leader->signal->tty = NULL;
+        group_leader->signal->tty_old_pgrp = 0;
+        err = process_group(group_leader);
 out:
         write_unlock_irq(&tasklist_lock);
         up(&tty_sem);
@@ -1687,7 +1700,10 @@ static void k_getrusage(struct task_struct *p, int who, struct rusage *r)
         if (unlikely(!p->signal))
                 return;
 
+        utime = stime = cputime_zero;
+
         switch (who) {
+                case RUSAGE_BOTH:
                 case RUSAGE_CHILDREN:
                         spin_lock_irqsave(&p->sighand->siglock, flags);
                         utime = p->signal->cutime;
@@ -1697,22 +1713,11 @@ static void k_getrusage(struct task_struct *p, int who, struct rusage *r)
                         r->ru_minflt = p->signal->cmin_flt;
                         r->ru_majflt = p->signal->cmaj_flt;
                         spin_unlock_irqrestore(&p->sighand->siglock, flags);
-                        cputime_to_timeval(utime, &r->ru_utime);
-                        cputime_to_timeval(stime, &r->ru_stime);
-                        break;
+
+                        if (who == RUSAGE_CHILDREN)
+                                break;
+
                 case RUSAGE_SELF:
-                        spin_lock_irqsave(&p->sighand->siglock, flags);
-                        utime = stime = cputime_zero;
-                        goto sum_group;
-                case RUSAGE_BOTH:
-                        spin_lock_irqsave(&p->sighand->siglock, flags);
-                        utime = p->signal->cutime;
-                        stime = p->signal->cstime;
-                        r->ru_nvcsw = p->signal->cnvcsw;
-                        r->ru_nivcsw = p->signal->cnivcsw;
-                        r->ru_minflt = p->signal->cmin_flt;
-                        r->ru_majflt = p->signal->cmaj_flt;
-                sum_group:
                         utime = cputime_add(utime, p->signal->utime);
                         stime = cputime_add(stime, p->signal->stime);
                         r->ru_nvcsw += p->signal->nvcsw;
@@ -1729,13 +1734,14 @@ static void k_getrusage(struct task_struct *p, int who, struct rusage *r)
                                 r->ru_majflt += t->maj_flt;
                                 t = next_thread(t);
                         } while (t != p);
-                        spin_unlock_irqrestore(&p->sighand->siglock, flags);
-                        cputime_to_timeval(utime, &r->ru_utime);
-                        cputime_to_timeval(stime, &r->ru_stime);
                         break;
+
                 default:
                         BUG();
         }
+
+        cputime_to_timeval(utime, &r->ru_utime);
+        cputime_to_timeval(stime, &r->ru_stime);
 }
 
 int getrusage(struct task_struct *p, int who, struct rusage __user *ru)