Bug#888028: nvidia-driver: applications running with discrete NVIDIA graphics tries to create /home/user.nv/ directory

[Vincas Dargis]

Package: nvidia-driver
Severity: normal

Dear Maintainer,

Some appliactions that has AppArmor profile defined produces DENIED log
entries for strange `/home/vincas.nv/` paths:

```
type=AVC msg=audit(1516647002.968:744): apparmor="DENIED"
operation="mkdir" profile="thunderbird" name="/home/vincas.nv/"
pid=23705 comm="thunderbird" requested_mask="c" denied_mask="c"
fsuid=1000 ouid=1000
type=SYSCALL msg=audit(1516647002.968:744): arch=c000003e syscall=83
success=no exit=-13 a0=7f81fc94ac20 a1=1ff a2=1 a3=1 items=0 ppid=23694
pid=23705 auid=1000 uid=1000 gid=1000 euid=1000 suid=1000 fsuid=1000
egid=1000 sgid=1000 fsgid=1000 tty=pts2 ses=4 comm="thunderbird"
exe="/usr/lib/thunderbird/thunderbird-bin" key=(null)
```

This reproduces for me when I run application via `optirun` to enable 
NVIDIA discrete graphics. It does not reproduce if I run on integrated
Intel graphics.

After creating directory in question and setting appropriate permissions,
running application again produces these kind of files:

```
$ ls -a /home/vincas.nv/
.  ..  .glEHt9Vu  .glMKQk7L  .glMWvlTf
```

It looks like a path concatination bug.


-- System Information:
Debian Release: buster/sid
  APT prefers unstable-debug
  APT policy: (500, 'unstable-debug'), (500, 'unstable'), (500, 'stable'), (1, 'experimental')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 4.14.0-3-amd64 (SMP w/8 CPU cores)
Locale: LANG=lt_LT.UTF-8, LC_CTYPE=lt_LT.UTF-8 (charmap=UTF-8), LANGUAGE=lt (charmap=UTF-8)
Shell: /bin/sh linked to /usr/bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled

Versions of packages nvidia-driver depends on:
ii  nvidia-alternative                                384.111-3
pn  nvidia-driver-bin                                 <none>
pn  nvidia-driver-libs | nvidia-driver-libs-nonglvnd  <none>
ii  nvidia-installer-cleanup                          20151021+7
ii  nvidia-kernel-dkms [nvidia-kernel-384.111]        384.111-3
ii  nvidia-legacy-check                               384.111-3
ii  nvidia-support                                    20151021+7
ii  nvidia-vdpau-driver                               384.111-3
ii  xserver-xorg-video-nvidia                         384.111-3

Versions of packages nvidia-driver recommends:
pn  nvidia-persistenced  <none>
ii  nvidia-settings      384.111-1

Versions of packages nvidia-driver suggests:
ii  nvidia-kernel-dkms  384.111-3