android: binder: Sanity check at binder ioctl

Sanity check at binder ioctl function,
Only allow the shared mm_struct to use the same binder-object
to do binder operate.

And add proc->vma_vm_mm = current->mm at the open function.
The libbinder do ioctl before mmap called.

V2: Fix compile error for error commit
V3: Change the condition to proc->vma_vm_mm

Signed-off-by: Chen Feng <puck.chen@hisilicon.com>
Signed-off-by: Wei  Dong <weidong2@hisilicon.com>
Signed-off-by: Junmin Zhao <zhaojunmin@huawei.com>
Reviewed-by: Zhuangluan Su <suzhuangluan@hisilicon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 5 insertions, 0 deletions

diff --git a/drivers/android/binder.c b/drivers/android/binder.c
index a39e85f9efa9..f080a8b7659b 100644
--- a/drivers/android/binder.c
+++ b/drivers/android/binder.c
@@ -2737,6 +2737,10 @@ static long binder_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
         /*pr_info("binder_ioctl: %d:%d %x %lx\n",
                         proc->pid, current->pid, cmd, arg);*/
 
+        if (unlikely(current->mm != proc->vma_vm_mm)) {
+                pr_err("current mm mismatch proc mm\n");
+                return -EINVAL;
+        }
         trace_binder_ioctl(cmd, arg);
 
         ret = wait_event_interruptible(binder_user_error_wait, binder_stop_on_user_error < 2);
@@ -2951,6 +2955,7 @@ static int binder_open(struct inode *nodp, struct file *filp)
                 return -ENOMEM;
         get_task_struct(current);
         proc->tsk = current;
+        proc->vma_vm_mm = current->mm;
         INIT_LIST_HEAD(&proc->todo);
         init_waitqueue_head(&proc->wait);
         proc->default_priority = task_nice(current);