author: Minchan Kim <minchan@kernel.org> 2018-05-07 23:15:37 +0900
committer: Greg Kroah-Hartman <gregkh@linuxfoundation.org> 2018-05-14 16:06:48 +0200
commit: 720c241924046aff83f5f2323232f34a30a4c281
parent: 838d5565669aa5bb7deb605684a5970d51d5eaf6
Commit Summary:
Diffstat:
2 files changed, 6 insertions, 4 deletions
diff --git a/drivers/android/binder.c b/drivers/android/binder.c
index 9c30d38c6f0d..e94e2b13ea2a 100644
--- a/drivers/android/binder.c
+++ b/drivers/android/binder.c
@@ -4727,7 +4727,9 @@ static int binder_mmap(struct file *filp, struct vm_area_struct *vma)
failure_string = "bad vm_flags";
goto err_bad_arg;
}
- vma->vm_flags = (vma->vm_flags | VM_DONTCOPY) & ~VM_MAYWRITE;
+ vma->vm_flags |= VM_DONTCOPY | VM_MIXEDMAP;
+ vma->vm_flags &= ~VM_MAYWRITE;
+
vma->vm_ops = &binder_vm_ops;
vma->vm_private_data = proc;
diff --git a/drivers/android/binder_alloc.c b/drivers/android/binder_alloc.c
index 5a426c877dfb..4f382d51def1 100644
--- a/drivers/android/binder_alloc.c
+++ b/drivers/android/binder_alloc.c
@@ -219,7 +219,7 @@ static int binder_update_page_range(struct binder_alloc *alloc, int allocate,
mm = alloc->vma_vm_mm;
if (mm) {
- down_write(&mm->mmap_sem);
+ down_read(&mm->mmap_sem);
vma = alloc->vma;
}
@@ -288,7 +288,7 @@ static int binder_update_page_range(struct binder_alloc *alloc, int allocate,
/* vm_insert_page does not seem to increment the refcount */
}
if (mm) {
- up_write(&mm->mmap_sem);
+ up_read(&mm->mmap_sem);
mmput(mm);
}
return 0;
@@ -321,7 +321,7 @@ err_page_ptr_cleared:
}
err_no_vma:
if (mm) {
- up_write(&mm->mmap_sem);
+ up_read(&mm->mmap_sem);
mmput(mm);
}
return vma ? -ENOMEM : -ESRCH;