mm-protect-activate-switch-mm.patch

Subject: mm-protect-activate-switch-mm.patch
From: Thomas Gleixner <tglx@linutronix.de>
Date: Mon, 04 Jul 2011 09:48:40 +0200

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
---
 fs/exec.c        |    2 ++
 mm/mmu_context.c |    2 ++
 2 files changed, 4 insertions(+)

Index: linux-stable/fs/exec.c
===================================================================
--- linux-stable.orig/fs/exec.c
+++ linux-stable/fs/exec.c
@@ -836,10 +836,12 @@ static int exec_mmap(struct mm_struct *m
 		}
 	}
 	task_lock(tsk);
+	local_irq_disable_rt();
 	active_mm = tsk->active_mm;
 	tsk->mm = mm;
 	tsk->active_mm = mm;
 	activate_mm(active_mm, mm);
+	local_irq_enable_rt();
 	task_unlock(tsk);
 	arch_pick_mmap_layout(mm);
 	if (old_mm) {
Index: linux-stable/mm/mmu_context.c
===================================================================
--- linux-stable.orig/mm/mmu_context.c
+++ linux-stable/mm/mmu_context.c
@@ -26,6 +26,7 @@ void use_mm(struct mm_struct *mm)
 	struct task_struct *tsk = current;
 
 	task_lock(tsk);
+	local_irq_disable_rt();
 	active_mm = tsk->active_mm;
 	if (active_mm != mm) {
 		atomic_inc(&mm->mm_count);
@@ -33,6 +34,7 @@ void use_mm(struct mm_struct *mm)
 	}
 	tsk->mm = mm;
 	switch_mm(active_mm, mm, tsk);
+	local_irq_enable_rt();
 	task_unlock(tsk);
 
 	if (active_mm != mm)