s390/mm: downgrade page table after fork of a 31 bit process

The downgrade of the 4 level page table created by init_new_context is
currently done only in start_thread31. If a 31 bit process forks the
new mm uses a 4 level page table, including the task size of 2<<42
that goes along with it. This is incorrect as now a 31 bit process
can map memory beyond 2GB. Define arch_dup_mmap to do the downgrade
after fork.

Cc: stable@vger.kernel.org
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

1 files changed, 10 insertions, 2 deletions

diff --git a/arch/s390/mm/mmap.c b/arch/s390/mm/mmap.c
index 573384256c5c..c59a5efa58b1 100644
--- a/arch/s390/mm/mmap.c
+++ b/arch/s390/mm/mmap.c
@@ -103,9 +103,15 @@ void arch_pick_mmap_layout(struct mm_struct *mm)
 
 int s390_mmap_check(unsigned long addr, unsigned long len)
 {
+        int rc;
+
         if (!is_compat_task() &&
-            len >= TASK_SIZE && TASK_SIZE < (1UL << 53))
-                return crst_table_upgrade(current->mm, 1UL << 53);
+            len >= TASK_SIZE && TASK_SIZE < (1UL << 53)) {
+                rc = crst_table_upgrade(current->mm, 1UL << 53);
+                if (rc)
+                        return rc;
+                update_mm(current->mm, current);
+        }
         return 0;
 }
 
@@ -125,6 +131,7 @@ s390_get_unmapped_area(struct file *filp, unsigned long addr,
                 rc = crst_table_upgrade(mm, 1UL << 53);
                 if (rc)
                         return (unsigned long) rc;
+                update_mm(mm, current);
                 area = arch_get_unmapped_area(filp, addr, len, pgoff, flags);
         }
         return area;
@@ -147,6 +154,7 @@ s390_get_unmapped_area_topdown(struct file *filp, const unsigned long addr,
                 rc = crst_table_upgrade(mm, 1UL << 53);
                 if (rc)
                         return (unsigned long) rc;
+                update_mm(mm, current);
                 area = arch_get_unmapped_area_topdown(filp, addr, len,
                                                       pgoff, flags);
         }