QSysInfo doesn't work properly with AppArmor confinement

Trying to detect platform (OS) name and version on Ubuntu Touch 15.04 based phones and tablets using QML. On the Ubuntu Desktop QSysInfo provides the following _correct_ values:

QSysInfo::productType(): "ubuntu"
QSysInfo::productVersion(): "16.04"
QSysInfo::prettyProductName(): "Ubuntu 16.04 LTS"

However, in a confined environment (e.g. bq Aquaris E5 HD Ubuntu Edition / 15.04 OTA-11) the following _incorrect_ values are provided by QSysInfo:

QSysInfo::productType(): "unknown"
QSysInfo::productVersion(): "unknown"
QSysInfo::prettyProductName(): "Linux 3.4.67"

I suppose it's because QSysInfo tries to (or would need to) access such files on the filesystem that are blocked by AppArmor, like /etc/os-release or such.

Ideally, QSysInfo::productVersion() should return not only "15.04" on an Ubuntu Touch device, but also the OTA release number. So it should be more like: "15.04 OTA-11". That's because "15.04" alone doesn't tell much about the actual Ubuntu Touch OS release installed on a mobile device.