Merge pull request #27520 from dmcgowan/fix-27384

Add limit to page size used by overlay2 driver
Upstream-commit: 74f486cd71e99e5e7a04a98e941841af48771c5d
Component: engine

components/engine/daemon/graphdriver/overlay2/overlay.go

@@ -473,6 +473,15 @@ func (d *Driver) Get(id string, mountLabel string) (s string, err error) {
 
 	pageSize := syscall.Getpagesize()
 
+	// Go can return a larger page size than supported by the system
+	// as of go 1.7. This will be fixed in 1.8 and this block can be
+	// removed when building with 1.8.
+	// See https://github.com/golang/go/commit/1b9499b06989d2831e5b156161d6c07642926ee1
+	// See https://github.com/docker/docker/issues/27384
+	if pageSize > 4096 {
+		pageSize = 4096
+	}
+
 	// Use relative paths and mountFrom when the mount data has exceeded
 	// the page size. The mount syscall fails if the mount data cannot
 	// fit within a page and relative links make the mount data much