Merge branch 'for-linus' of git://git.armlinux.org.uk/~rmk/linux-arm

Pull ARM updates from Russell King:

 - add support for ftrace-with-registers, which is needed for kgraft and
   other ftrace tools

 - support for mremap() for the sigpage/vDSO so that checkpoint/restore
   can work

 - add timestamps to each line of the register dump output

 - remove the unused KTHREAD_SIZE from nommu

 - align the ARM bitops APIs with the generic API (using unsigned long
   pointers rather than void pointers)

 - make the configuration of userspace Thumb support an expert option so
   that we can default it on, and avoid some hard to debug userspace
   crashes

* 'for-linus' of git://git.armlinux.org.uk/~rmk/linux-arm:
  ARM: 8684/1: NOMMU: Remove unused KTHREAD_SIZE definition
  ARM: 8683/1: ARM32: Support mremap() for sigpage/vDSO
  ARM: 8679/1: bitops: Align prototypes to generic API
  ARM: 8678/1: ftrace: Adds support for CONFIG_DYNAMIC_FTRACE_WITH_REGS
  ARM: make configuration of userspace Thumb support an expert option
  ARM: 8673/1: Fix __show_regs output timestamps

1 files changed, 4 insertions, 0 deletions

diff --git a/mm/mmap.c b/mm/mmap.c
index 5a0ba9788cdd..7f8cfe9d9b4d 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -3186,8 +3186,12 @@ static int special_mapping_mremap(struct vm_area_struct *new_vma)
 {
 	struct vm_special_mapping *sm = new_vma->vm_private_data;
 
+	if (WARN_ON_ONCE(current->mm != new_vma->vm_mm))
+		return -EFAULT;
+
 	if (sm->mremap)
 		return sm->mremap(sm, new_vma);
+
 	return 0;
 }