[apparmor] [patch] Fix user-download abstraction for non-latin file names (take #2)

[Vincas Dargis]

Hello,

Some time ago I've sent tiny patch [0], but received no comments. Maybe it got lost..? It had patch as attachment, maybe 
that's the problem? I am resubmitting original message with inline patch this time:

---

I have noticed that abstractions/user-download profile allows to download into home directory, while protecting dot files:

owner @{HOME}/[a-zA-Z0-9]*           rwl,

Though it fails for files with non-latin symbols, tested with /usr/bin/tee copied to /usr/local/bin/testtee with minimal
profile using user-download abstraction:

echo "foo" | testtee ~/ąčęėįšųūž
testtee: /home/vincas/ąčęėįšųūž: Permission denied

When file rule is changed into:

owner @{HOME}/[^.]*		     rwl,

It works as expected:

$ echo "foo" | testtee ~/ąčęėįšųūž
foo

$ echo "foo" | testtee ~/.bashrc
testtee: /home/vincas/.bashrc: Permission denied


[ 01-fix-apparmor-user-download-nonlatin.diff ]

=== modified file 'profiles/apparmor.d/abstractions/user-download'
--- profiles/apparmor.d/abstractions/user-download	2014-02-14 22:28:16 +0000
+++ profiles/apparmor.d/abstractions/user-download	2017-04-17 13:21:24 +0000
@@ -15,7 +15,7 @@
    owner @{HOME}/tmp/**       		rwl,
    owner @{HOME}/[dD]ownload{,s}/	r,
    owner @{HOME}/[dD]ownload{,s}/**	rwl,
-  owner @{HOME}/[a-zA-Z0-9]* 		rwl,
+  owner @{HOME}/[^.]* 			rwl,
    owner @{HOME}/@{XDG_DESKTOP_DIR}/	r,
    owner @{HOME}/@{XDG_DESKTOP_DIR}/*	rwl,
    owner @{HOME}/@{XDG_DOWNLOAD_DIR}/	r,


[0] https://lists.ubuntu.com/archives/apparmor/2017-April/010710.html