1 files changed, 21 insertions, 0 deletions

diff --git a/arch/arm/kernel/process.c b/arch/arm/kernel/process.c
index 401e38be1f78..66ac9c926200 100644
--- a/arch/arm/kernel/process.c
+++ b/arch/arm/kernel/process.c
@@ -458,3 +458,24 @@ unsigned long arch_randomize_brk(struct mm_struct *mm)
         unsigned long range_end = mm->brk + 0x02000000;
         return randomize_range(mm->brk, range_end, 0) ? : mm->brk;
 }
+
+/*
+ * The vectors page is always readable from user space for the
+ * atomic helpers and the signal restart code.  Let's declare a mapping
+ * for it so it is visible through ptrace and /proc/<pid>/mem.
+ */
+
+int vectors_user_mapping(void)
+{
+        struct mm_struct *mm = current->mm;
+        return install_special_mapping(mm, 0xffff0000, PAGE_SIZE,
+                                       VM_READ | VM_EXEC |
+                                       VM_MAYREAD | VM_MAYEXEC |
+                                       VM_ALWAYSDUMP | VM_RESERVED,
+                                       NULL);
+}
+
+const char *arch_vma_name(struct vm_area_struct *vma)
+{
+        return (vma->vm_start == 0xffff0000) ? "[vectors]" : NULL;
+}