tile: use pmd_pfn() instead of casting via pte_t

[cascardo/linux.git] / kernel / fork.c

diff --git a/kernel/fork.c b/kernel/fork.c
index bf46287..81ccb4f 100644 (file)
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -351,7 +351,6 @@ static int dup_mmap(struct mm_struct *mm, struct mm_struct *oldmm)
        struct rb_node **rb_link, *rb_parent;
        int retval;
        unsigned long charge;
-       struct mempolicy *pol;
 
        uprobe_start_dup_mmap();
        down_write(&oldmm->mmap_sem);
@@ -400,11 +399,9 @@ static int dup_mmap(struct mm_struct *mm, struct mm_struct *oldmm)
                        goto fail_nomem;
                *tmp = *mpnt;
                INIT_LIST_HEAD(&tmp->anon_vma_chain);
-               pol = mpol_dup(vma_policy(mpnt));
-               retval = PTR_ERR(pol);
-               if (IS_ERR(pol))
+               retval = vma_dup_policy(mpnt, tmp);
+               if (retval)
                        goto fail_nomem_policy;
-               vma_set_policy(tmp, pol);
                tmp->vm_mm = mm;
                if (anon_vma_fork(tmp, mpnt))
                        goto fail_nomem_anon_vma_fork;
@@ -472,7 +469,7 @@ out:
        uprobe_end_dup_mmap();
        return retval;
 fail_nomem_anon_vma_fork:
-       mpol_put(pol);
+       mpol_put(vma_policy(tmp));
 fail_nomem_policy:
        kmem_cache_free(vm_area_cachep, tmp);
 fail_nomem:
@@ -1173,13 +1170,16 @@ static struct task_struct *copy_process(unsigned long clone_flags,
                return ERR_PTR(-EINVAL);
 
        /*
-        * If the new process will be in a different pid namespace
-        * don't allow the creation of threads.
+        * If the new process will be in a different pid or user namespace
+        * do not allow it to share a thread group or signal handlers or
+        * parent with the forking task.
         */
-       if ((clone_flags & (CLONE_VM|CLONE_NEWPID)) &&
-           (task_active_pid_ns(current) !=
-            current->nsproxy->pid_ns_for_children))
-               return ERR_PTR(-EINVAL);
+       if (clone_flags & (CLONE_SIGHAND | CLONE_PARENT)) {
+               if ((clone_flags & (CLONE_NEWUSER | CLONE_NEWPID)) ||
+                   (task_active_pid_ns(current) !=
+                               current->nsproxy->pid_ns_for_children))
+                       return ERR_PTR(-EINVAL);
+       }
 
        retval = security_task_create(clone_flags);
        if (retval)
@@ -1575,15 +1575,6 @@ long do_fork(unsigned long clone_flags,
        int trace = 0;
        long nr;
 
-       /*
-        * Do some preliminary argument and permissions checking before we
-        * actually start allocating stuff
-        */
-       if (clone_flags & (CLONE_NEWUSER | CLONE_NEWPID)) {
-               if (clone_flags & (CLONE_THREAD|CLONE_PARENT))
-                       return -EINVAL;
-       }
-
        /*
         * Determine whether and which event to report to ptracer.  When
         * called from kernel_thread or CLONE_UNTRACED is explicitly
@@ -1824,11 +1815,6 @@ SYSCALL_DEFINE1(unshare, unsigned long, unshare_flags)
         */
        if (unshare_flags & CLONE_NEWUSER)
                unshare_flags |= CLONE_THREAD | CLONE_FS;
-       /*
-        * If unsharing a pid namespace must also unshare the thread.
-        */
-       if (unshare_flags & CLONE_NEWPID)
-               unshare_flags |= CLONE_THREAD;
        /*
         * If unsharing a thread from a thread group, must also unshare vm.
         */