10 files changed, 107 insertions, 67 deletions

diff --git a/kernel/exit.c b/kernel/exit.c
index 6a057750ebbb..fafe75d9e6f6 100644
--- a/kernel/exit.c
+++ b/kernel/exit.c
@@ -312,17 +312,6 @@ kill_orphaned_pgrp(struct task_struct *tsk, struct task_struct *parent)
         }
 }
 
-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);
-}
-
 /*
  * Let kernel threads use this to say that they allow a certain signal.
  * Must not be used if kthread was cloned with CLONE_SIGHAND.
diff --git a/kernel/fork.c b/kernel/fork.c
index 987b28a1f01b..6e6a1c11b3e5 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -1121,6 +1121,12 @@ static void posix_cpu_timers_init(struct task_struct *tsk)
         INIT_LIST_HEAD(&tsk->cpu_timers[2]);
 }
 
+static inline void
+init_task_pid(struct task_struct *task, enum pid_type type, struct pid *pid)
+{
+         task->pids[type].pid = pid;
+}
+
 /*
  * This creates a new process as a copy of the old one,
  * but does not actually start it yet.
@@ -1199,8 +1205,8 @@ static struct task_struct *copy_process(unsigned long clone_flags,
         retval = -EAGAIN;
         if (atomic_read(&p->real_cred->user->processes) >=
                         task_rlimit(p, RLIMIT_NPROC)) {
-                if (!capable(CAP_SYS_ADMIN) && !capable(CAP_SYS_RESOURCE) &&
-                    p->real_cred->user != INIT_USER)
+                if (p->real_cred->user != INIT_USER &&
+                    !capable(CAP_SYS_RESOURCE) && !capable(CAP_SYS_ADMIN))
                         goto bad_fork_free;
         }
         current->flags &= ~PF_NPROC_EXCEEDED;
@@ -1354,11 +1360,6 @@ static struct task_struct *copy_process(unsigned long clone_flags,
                         goto bad_fork_cleanup_io;
         }
 
-        p->pid = pid_nr(pid);
-        p->tgid = p->pid;
-        if (clone_flags & CLONE_THREAD)
-                p->tgid = current->tgid;
-
         p->set_child_tid = (clone_flags & CLONE_CHILD_SETTID) ? child_tidptr : NULL;
         /*
          * Clear TID on mm_release()?
@@ -1394,12 +1395,19 @@ static struct task_struct *copy_process(unsigned long clone_flags,
         clear_all_latency_tracing(p);
 
         /* ok, now we should be set up.. */
-        if (clone_flags & CLONE_THREAD)
+        p->pid = pid_nr(pid);
+        if (clone_flags & CLONE_THREAD) {
                 p->exit_signal = -1;
-        else if (clone_flags & CLONE_PARENT)
-                p->exit_signal = current->group_leader->exit_signal;
-        else
-                p->exit_signal = (clone_flags & CSIGNAL);
+                p->group_leader = current->group_leader;
+                p->tgid = current->tgid;
+        } else {
+                if (clone_flags & CLONE_PARENT)
+                        p->exit_signal = current->group_leader->exit_signal;
+                else
+                        p->exit_signal = (clone_flags & CSIGNAL);
+                p->group_leader = p;
+                p->tgid = p->pid;
+        }
 
         p->pdeath_signal = 0;
         p->exit_state = 0;
@@ -1408,15 +1416,13 @@ static struct task_struct *copy_process(unsigned long clone_flags,
         p->nr_dirtied_pause = 128 >> (PAGE_SHIFT - 10);
         p->dirty_paused_when = 0;
 
-        /*
-         * Ok, make it visible to the rest of the system.
-         * We dont wake it up yet.
-         */
-        p->group_leader = p;
         INIT_LIST_HEAD(&p->thread_group);
         p->task_works = NULL;
 
-        /* Need tasklist lock for parent etc handling! */
+        /*
+         * Make it visible to the rest of the system, but dont wake it up yet.
+         * Need tasklist lock for parent etc handling!
+         */
         write_lock_irq(&tasklist_lock);
 
         /* CLONE_PARENT re-uses the old parent */
@@ -1446,18 +1452,14 @@ static struct task_struct *copy_process(unsigned long clone_flags,
                 goto bad_fork_free_pid;
         }
 
-        if (clone_flags & CLONE_THREAD) {
-                current->signal->nr_threads++;
-                atomic_inc(&current->signal->live);
-                atomic_inc(&current->signal->sigcnt);
-                p->group_leader = current->group_leader;
-                list_add_tail_rcu(&p->thread_group, &p->group_leader->thread_group);
-        }
-
         if (likely(p->pid)) {
                 ptrace_init_task(p, (clone_flags & CLONE_PTRACE) || trace);
 
+                init_task_pid(p, PIDTYPE_PID, pid);
                 if (thread_group_leader(p)) {
+                        init_task_pid(p, PIDTYPE_PGID, task_pgrp(current));
+                        init_task_pid(p, PIDTYPE_SID, task_session(current));
+
                         if (is_child_reaper(pid)) {
                                 ns_of_pid(pid)->child_reaper = p;
                                 p->signal->flags |= SIGNAL_UNKILLABLE;
@@ -1465,13 +1467,19 @@ static struct task_struct *copy_process(unsigned long clone_flags,
 
                         p->signal->leader_pid = pid;
                         p->signal->tty = tty_kref_get(current->signal->tty);
-                        attach_pid(p, PIDTYPE_PGID, task_pgrp(current));
-                        attach_pid(p, PIDTYPE_SID, task_session(current));
                         list_add_tail(&p->sibling, &p->real_parent->children);
                         list_add_tail_rcu(&p->tasks, &init_task.tasks);
+                        attach_pid(p, PIDTYPE_PGID);
+                        attach_pid(p, PIDTYPE_SID);
                         __this_cpu_inc(process_counts);
+                } else {
+                        current->signal->nr_threads++;
+                        atomic_inc(&current->signal->live);
+                        atomic_inc(&current->signal->sigcnt);
+                        list_add_tail_rcu(&p->thread_group,
+                                          &p->group_leader->thread_group);
                 }
-                attach_pid(p, PIDTYPE_PID, pid);
+                attach_pid(p, PIDTYPE_PID);
                 nr_threads++;
         }
 
diff --git a/kernel/kmod.c b/kernel/kmod.c
index 8241906c4b61..fb326365b694 100644
--- a/kernel/kmod.c
+++ b/kernel/kmod.c
@@ -147,6 +147,9 @@ int __request_module(bool wait, const char *fmt, ...)
          */
         WARN_ON_ONCE(wait && current_is_async());
 
+        if (!modprobe_path[0])
+                return 0;
+
         va_start(args, fmt);
         ret = vsnprintf(module_name, MODULE_NAME_LEN, fmt, args);
         va_end(args);
@@ -569,14 +572,6 @@ int call_usermodehelper_exec(struct subprocess_info *sub_info, int wait)
         int retval = 0;
 
         helper_lock();
-        if (!sub_info->path) {
-                retval = -EINVAL;
-                goto out;
-        }
-
-        if (sub_info->path[0] == '\0')
-                goto out;
-
         if (!khelper_wq || usermodehelper_disabled) {
                 retval = -EBUSY;
                 goto out;
diff --git a/kernel/kprobes.c b/kernel/kprobes.c
index bddf3b201a48..6e33498d665c 100644
--- a/kernel/kprobes.c
+++ b/kernel/kprobes.c
@@ -2332,6 +2332,7 @@ static ssize_t write_enabled_file_bool(struct file *file,
         if (copy_from_user(buf, user_buf, buf_size))
                 return -EFAULT;
 
+        buf[buf_size] = '\0';
         switch (buf[0]) {
         case 'y':
         case 'Y':
@@ -2343,6 +2344,8 @@ static ssize_t write_enabled_file_bool(struct file *file,
         case '0':
                 disarm_all_kprobes();
                 break;
+        default:
+                return -EINVAL;
         }
 
         return count;
diff --git a/kernel/pid.c b/kernel/pid.c
index 0db3e791a06d..66505c1dfc51 100644
--- a/kernel/pid.c
+++ b/kernel/pid.c
@@ -75,6 +75,7 @@ struct pid_namespace init_pid_ns = {
                 [ 0 ... PIDMAP_ENTRIES-1] = { ATOMIC_INIT(BITS_PER_PAGE), NULL }
         },
         .last_pid = 0,
+        .nr_hashed = PIDNS_HASH_ADDING,
         .level = 0,
         .child_reaper = &init_task,
         .user_ns = &init_user_ns,
@@ -373,14 +374,10 @@ EXPORT_SYMBOL_GPL(find_vpid);
 /*
  * attach_pid() must be called with the tasklist_lock write-held.
  */
-void attach_pid(struct task_struct *task, enum pid_type type,
-                struct pid *pid)
+void attach_pid(struct task_struct *task, enum pid_type type)
 {
-        struct pid_link *link;
-
-        link = &task->pids[type];
-        link->pid = pid;
-        hlist_add_head_rcu(&link->node, &pid->tasks[type]);
+        struct pid_link *link = &task->pids[type];
+        hlist_add_head_rcu(&link->node, &link->pid->tasks[type]);
 }
 
 static void __change_pid(struct task_struct *task, enum pid_type type,
@@ -412,7 +409,7 @@ void change_pid(struct task_struct *task, enum pid_type type,
                 struct pid *pid)
 {
         __change_pid(task, type, pid);
-        attach_pid(task, type, pid);
+        attach_pid(task, type);
 }
 
 /* transfer_pid is an optimization of attach_pid(new), detach_pid(old) */
@@ -594,7 +591,6 @@ void __init pidmap_init(void)
         /* Reserve PID 0. We never call free_pidmap(0) */
         set_bit(0, init_pid_ns.pidmap[0].page);
         atomic_dec(&init_pid_ns.pidmap[0].nr_free);
-        init_pid_ns.nr_hashed = PIDNS_HASH_ADDING;
 
         init_pid_ns.pid_cachep = KMEM_CACHE(pid,
                         SLAB_HWCACHE_ALIGN | SLAB_PANIC);
diff --git a/kernel/power/snapshot.c b/kernel/power/snapshot.c
index 7872a35eafe7..349587bb03e1 100644
--- a/kernel/power/snapshot.c
+++ b/kernel/power/snapshot.c
@@ -1652,7 +1652,7 @@ unsigned long snapshot_get_image_size(void)
 static int init_header(struct swsusp_info *info)
 {
         memset(info, 0, sizeof(struct swsusp_info));
-        info->num_physpages = num_physpages;
+        info->num_physpages = get_num_physpages();
         info->image_pages = nr_copy_pages;
         info->pages = snapshot_get_image_size();
         info->size = info->pages;
@@ -1796,7 +1796,7 @@ static int check_header(struct swsusp_info *info)
         char *reason;
 
         reason = check_image_kernel(info);
-        if (!reason && info->num_physpages != num_physpages)
+        if (!reason && info->num_physpages != get_num_physpages())
                 reason = "memory size";
         if (reason) {
                 printk(KERN_ERR "PM: Image mismatch: %s\n", reason);
diff --git a/kernel/ptrace.c b/kernel/ptrace.c
index 335a7ae697f5..ba5e6cea181a 100644
--- a/kernel/ptrace.c
+++ b/kernel/ptrace.c
@@ -844,6 +844,47 @@ int ptrace_request(struct task_struct *child, long request,
                         ret = ptrace_setsiginfo(child, &siginfo);
                 break;
 
+        case PTRACE_GETSIGMASK:
+                if (addr != sizeof(sigset_t)) {
+                        ret = -EINVAL;
+                        break;
+                }
+
+                if (copy_to_user(datavp, &child->blocked, sizeof(sigset_t)))
+                        ret = -EFAULT;
+                else
+                        ret = 0;
+
+                break;
+
+        case PTRACE_SETSIGMASK: {
+                sigset_t new_set;
+
+                if (addr != sizeof(sigset_t)) {
+                        ret = -EINVAL;
+                        break;
+                }
+
+                if (copy_from_user(&new_set, datavp, sizeof(sigset_t))) {
+                        ret = -EFAULT;
+                        break;
+                }
+
+                sigdelsetmask(&new_set, sigmask(SIGKILL)|sigmask(SIGSTOP));
+
+                /*
+                 * Every thread does recalc_sigpending() after resume, so
+                 * retarget_shared_pending() and recalc_sigpending() are not
+                 * called here.
+                 */
+                spin_lock_irq(&child->sighand->siglock);
+                child->blocked = new_set;
+                spin_unlock_irq(&child->sighand->siglock);
+
+                ret = 0;
+                break;
+        }
+
         case PTRACE_INTERRUPT:
                 /*
                  * Stop tracee without any side-effect on signal or job
@@ -948,8 +989,7 @@ int ptrace_request(struct task_struct *child, long request,
 
 #ifdef CONFIG_HAVE_ARCH_TRACEHOOK
         case PTRACE_GETREGSET:
-        case PTRACE_SETREGSET:
-        {
+        case PTRACE_SETREGSET: {
                 struct iovec kiov;
                 struct iovec __user *uiov = datavp;
 
diff --git a/kernel/rcutree.c b/kernel/rcutree.c
index cf3adc6fe001..e08abb9461ac 100644
--- a/kernel/rcutree.c
+++ b/kernel/rcutree.c
@@ -3026,7 +3026,7 @@ static int __init rcu_spawn_gp_kthread(void)
         struct task_struct *t;
 
         for_each_rcu_flavor(rsp) {
-                t = kthread_run(rcu_gp_kthread, rsp, rsp->name);
+                t = kthread_run(rcu_gp_kthread, rsp, "%s", rsp->name);
                 BUG_ON(IS_ERR(t));
                 rnp = rcu_get_root(rsp);
                 raw_spin_lock_irqsave(&rnp->lock, flags);
diff --git a/kernel/resource.c b/kernel/resource.c
index 77bf11a86c7d..3f285dce9347 100644
--- a/kernel/resource.c
+++ b/kernel/resource.c
@@ -449,7 +449,6 @@ static int __find_resource(struct resource *root, struct resource *old,
         struct resource *this = root->child;
         struct resource tmp = *new, avail, alloc;
 
-        tmp.flags = new->flags;
         tmp.start = root->start;
         /*
          * Skip past an allocated resource that starts at 0, since the assignment
diff --git a/kernel/sys.c b/kernel/sys.c
index 2bbd9a73b54c..071de900c824 100644
--- a/kernel/sys.c
+++ b/kernel/sys.c
@@ -511,7 +511,7 @@ SYSCALL_DEFINE4(reboot, int, magic1, int, magic2, unsigned int, cmd,
         case LINUX_REBOOT_CMD_HALT:
                 kernel_halt();
                 do_exit(0);
-                panic("cannot halt");
+                panic("cannot halt.\n");
 
         case LINUX_REBOOT_CMD_POWER_OFF:
                 kernel_power_off();
@@ -1309,6 +1309,17 @@ 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;
@@ -1328,7 +1339,7 @@ SYSCALL_DEFINE0(setsid)
                 goto out;
 
         group_leader->signal->leader = 1;
-        __set_special_pids(sid);
+        set_special_pids(sid);
 
         proc_clear_tty(group_leader);
 
@@ -2355,8 +2366,7 @@ static int do_sysinfo(struct sysinfo *info)
 
         memset(info, 0, sizeof(struct sysinfo));
 
-        ktime_get_ts(&tp);
-        monotonic_to_bootbased(&tp);
+        get_monotonic_boottime(&tp);
         info->uptime = tp.tv_sec + (tp.tv_nsec ? 1 : 0);
 
         get_avenrun(info->loads, 0, SI_LOAD_SHIFT - FSHIFT);