Local data disclosure via unsafe hook file reads

Improper link resolution in Canonical Apport allows local users to read private data through xorg package crash-report hooks. The read_file() helper in apport/hookutils.py opens supplied paths without rejecting symbolic links or FIFOs, so privileged hook collection reads attacker-controlled targets. Exploitation requires low-privileged local access and an xorg package hook invocation; the documented impact is disclosure of private file contents.