diff --git a/mm/mmap.c b/mm/mmap.c
index f5b137f5f681ed94fe4df37e8900e8f279c9b277..ad643f9dd3a4422f7938dae43ddcd083de119b44 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -3203,6 +3203,7 @@ SYSCALL_DEFINE5(remap_file_pages, unsigned long, start, unsigned long, size,
 	unsigned long populate = 0;
 	unsigned long ret = -EINVAL;
 	struct file *file;
+	vm_flags_t vm_flags;
 
 	pr_warn_once("%s (%d) uses deprecated remap_file_pages() syscall. See Documentation/vm/remap_file_pages.rst.\n",
 		     current->comm, current->pid);
@@ -3219,17 +3220,70 @@ SYSCALL_DEFINE5(remap_file_pages, unsigned long, start, unsigned long, size,
 	if (pgoff + (size >> PAGE_SHIFT) < pgoff)
 		return ret;
 
-	if (down_write_killable(&mm->mmap_sem))
+	if (down_read_killable(&mm->mmap_sem))
+		return -EINTR;
+
+	/*
+	 * Look up VMA under read lock first so we can perform the security
+	 * without holding locks (which can be problematic). We reacquire a
+	 * write lock later and check nothing changed underneath us.
+	 */
+	vma = find_vma(mm, start);
+
+	if (!vma || !(vma->vm_flags & VM_SHARED)) {
+		up_read(&mm->mmap_sem);
+		return -EINVAL;
+	}
+
+	if (start < vma->vm_start) {
+		up_read(&mm->mmap_sem);
+		return -EINVAL;
+	}
+
+	prot |= vma->vm_flags & VM_READ ? PROT_READ : 0;
+	prot |= vma->vm_flags & VM_WRITE ? PROT_WRITE : 0;
+	prot |= vma->vm_flags & VM_EXEC ? PROT_EXEC : 0;
+
+	flags &= MAP_NONBLOCK;
+	flags |= MAP_SHARED | MAP_FIXED | MAP_POPULATE;
+	if (vma->vm_flags & VM_LOCKED)
+		flags |= MAP_LOCKED;
+
+	/* Save vm_flags used to calculate prot and flags, and recheck later. */
+	vm_flags = vma->vm_flags;
+	file = get_file(vma->vm_file);
+
+	up_read(&mm->mmap_sem);
+
+	/* Call outside mmap_lock to be consistent with other callers. */
+	ret = security_mmap_file(file, prot, flags);
+	if (ret) {
+		fput(file);
+		return ret;
+	}
+
+	ret = -EINVAL;
+
+	/* OK security check passed, take write lock + let it rip. */
+	if (down_write_killable(&mm->mmap_sem)) {
+		fput(file);
 		return -EINTR;
+	}
 
 	vma = find_vma(mm, start);
 
-	if (!vma || !(vma->vm_flags & VM_SHARED))
+	if (!vma)
 		goto out;
 
 	if (start < vma->vm_start)
 		goto out;
 
+	/* Make sure things didn't change under us. */
+	if (vma->vm_flags != vm_flags)
+		goto out;
+	if (vma->vm_file != file)
+		goto out;
+
 	if (start + size > vma->vm_end) {
 		struct vm_area_struct *next;
 
@@ -3252,37 +3306,11 @@ SYSCALL_DEFINE5(remap_file_pages, unsigned long, start, unsigned long, size,
 			goto out;
 	}
 
-	prot |= vma->vm_flags & VM_READ ? PROT_READ : 0;
-	prot |= vma->vm_flags & VM_WRITE ? PROT_WRITE : 0;
-	prot |= vma->vm_flags & VM_EXEC ? PROT_EXEC : 0;
-
-	flags &= MAP_NONBLOCK;
-	flags |= MAP_SHARED | MAP_FIXED | MAP_POPULATE;
-	if (vma->vm_flags & VM_LOCKED) {
-		struct vm_area_struct *tmp;
-		flags |= MAP_LOCKED;
-
-		/* drop PG_Mlocked flag for over-mapped range */
-		for (tmp = vma; tmp->vm_start >= start + size;
-				tmp = tmp->vm_next) {
-			/*
-			 * Split pmd and munlock page on the border
-			 * of the range.
-			 */
-			vma_adjust_trans_huge(tmp, start, start + size, 0);
-
-			munlock_vma_pages_range(tmp,
-					max(tmp->vm_start, start),
-					min(tmp->vm_end, start + size));
-		}
-	}
-
-	file = get_file(vma->vm_file);
 	ret = do_mmap_pgoff(vma->vm_file, start, size,
 			prot, flags, pgoff, &populate, NULL);
-	fput(file);
 out:
 	up_write(&mm->mmap_sem);
+	fput(file);
 	if (populate)
 		mm_populate(ret, populate);
 	if (!IS_ERR_VALUE(ret))