1 files changed, 23 insertions, 19 deletions

diff --git a/kernel/fork.c b/kernel/fork.c
index 1d68f1255dd8..6715ebc3761d 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -61,6 +61,7 @@
 #include <linux/proc_fs.h>
 #include <linux/blkdev.h>
 #include <trace/sched.h>
+#include <linux/magic.h>
 
 #include <asm/pgtable.h>
 #include <asm/pgalloc.h>
@@ -212,6 +213,8 @@ static struct task_struct *dup_task_struct(struct task_struct *orig)
 {
         struct task_struct *tsk;
         struct thread_info *ti;
+        unsigned long *stackend;
+
         int err;
 
         prepare_to_copy(orig);
@@ -237,6 +240,8 @@ static struct task_struct *dup_task_struct(struct task_struct *orig)
                 goto out;
 
         setup_thread_stack(tsk, orig);
+        stackend = end_of_stack(tsk);
+        *stackend = STACK_END_MAGIC;    /* for overflow detection */
 
 #ifdef CONFIG_CC_STACKPROTECTOR
         tsk->stack_canary = get_random_int();
@@ -817,17 +822,17 @@ static void posix_cpu_timers_init_group(struct signal_struct *sig)
 static int copy_signal(unsigned long clone_flags, struct task_struct *tsk)
 {
         struct signal_struct *sig;
-        int ret;
 
         if (clone_flags & CLONE_THREAD) {
-                ret = thread_group_cputime_clone_thread(current);
-                if (likely(!ret)) {
-                        atomic_inc(&current->signal->count);
-                        atomic_inc(&current->signal->live);
-                }
-                return ret;
+                atomic_inc(&current->signal->count);
+                atomic_inc(&current->signal->live);
+                return 0;
         }
         sig = kmem_cache_alloc(signal_cachep, GFP_KERNEL);
+
+        if (sig)
+                posix_cpu_timers_init_group(sig);
+
         tsk->signal = sig;
         if (!sig)
                 return -ENOMEM;
@@ -851,21 +856,20 @@ static int copy_signal(unsigned long clone_flags, struct task_struct *tsk)
         sig->tty_old_pgrp = NULL;
         sig->tty = NULL;
 
-        sig->cutime = sig->cstime = cputime_zero;
+        sig->utime = sig->stime = sig->cutime = sig->cstime = cputime_zero;
         sig->gtime = cputime_zero;
         sig->cgtime = cputime_zero;
         sig->nvcsw = sig->nivcsw = sig->cnvcsw = sig->cnivcsw = 0;
         sig->min_flt = sig->maj_flt = sig->cmin_flt = sig->cmaj_flt = 0;
         sig->inblock = sig->oublock = sig->cinblock = sig->coublock = 0;
         task_io_accounting_init(&sig->ioac);
+        sig->sum_sched_runtime = 0;
         taskstats_tgid_init(sig);
 
         task_lock(current->group_leader);
         memcpy(sig->rlim, current->signal->rlim, sizeof sig->rlim);
         task_unlock(current->group_leader);
 
-        posix_cpu_timers_init_group(sig);
-
         acct_init_pacct(&sig->pacct);
 
         tty_audit_fork(sig);
@@ -901,7 +905,7 @@ static void copy_flags(unsigned long clone_flags, struct task_struct *p)
         clear_freeze_flag(p);
 }
 
-asmlinkage long sys_set_tid_address(int __user *tidptr)
+SYSCALL_DEFINE1(set_tid_address, int __user *, tidptr)
 {
         current->clear_child_tid = tidptr;
 
@@ -1007,6 +1011,7 @@ static struct task_struct *copy_process(unsigned long clone_flags,
          * triggers too late. This doesn't hurt, the check is only there
          * to stop root fork bombs.
          */
+        retval = -EAGAIN;
         if (nr_threads >= max_threads)
                 goto bad_fork_cleanup_count;
 
@@ -1095,7 +1100,7 @@ static struct task_struct *copy_process(unsigned long clone_flags,
 #ifdef CONFIG_DEBUG_MUTEXES
         p->blocked_on = NULL; /* not blocked yet */
 #endif
-        if (unlikely(ptrace_reparented(current)))
+        if (unlikely(current->ptrace))
                 ptrace_fork(p, clone_flags);
 
         /* Perform scheduler related setup. Assign this task to a CPU. */
@@ -1179,10 +1184,6 @@ static struct task_struct *copy_process(unsigned long clone_flags,
 #endif
         clear_all_latency_tracing(p);
 
-        /* Our parent execution domain becomes current domain
-           These must match for thread signalling to apply */
-        p->parent_exec_id = p->self_exec_id;
-
         /* ok, now we should be set up.. */
         p->exit_signal = (clone_flags & CLONE_THREAD) ? -1 : (clone_flags & CSIGNAL);
         p->pdeath_signal = 0;
@@ -1220,10 +1221,13 @@ static struct task_struct *copy_process(unsigned long clone_flags,
                 set_task_cpu(p, smp_processor_id());
 
         /* CLONE_PARENT re-uses the old parent */
-        if (clone_flags & (CLONE_PARENT|CLONE_THREAD))
+        if (clone_flags & (CLONE_PARENT|CLONE_THREAD)) {
                 p->real_parent = current->real_parent;
-        else
+                p->parent_exec_id = current->parent_exec_id;
+        } else {
                 p->real_parent = current;
+                p->parent_exec_id = current->self_exec_id;
+        }
 
         spin_lock(&current->sighand->siglock);
 
@@ -1603,7 +1607,7 @@ static int unshare_fd(unsigned long unshare_flags, struct files_struct **new_fdp
  * constructed. Here we are modifying the current, active,
  * task_struct.
  */
-asmlinkage long sys_unshare(unsigned long unshare_flags)
+SYSCALL_DEFINE1(unshare, unsigned long, unshare_flags)
 {
         int err = 0;
         struct fs_struct *fs, *new_fs = NULL;