1. Getting "Warning: failed to unmount /sys" on --chroot and --overlay

2. Startup warnings on Arch Linux:

(all fine here)
$ ./firejail
Parent pid 2495, child pid 2496
Child process initialized
$

(warnings)
$ ./firejail --overlay
Parent pid 2500, child pid 2501
OverlayFS configured in /home/ablive/.firejail/2500 directory
Warning: /var/lock not mounted
Warning: cannot find /var/run/utmp
Warning: failed to unmount /sys
Child process initialized
$ 

(warnings)
$ ./firejail --chroot=/media/mylinux
Parent pid 2503, child pid 2504
Warning: cannot find /var/run/utmp
Dropping all Linux capabilities and enforcing default seccomp filter
Warning: failed to unmount /sys
Child process initialized
$

5. Add IRC clients: KVIrc (KDE), BitchX (CLI), Smuxi, Konversation (KDE), HexChat, Irssi (CLI), WeeChat (CLI)
RSS: Liferea, akregator (KDE), newsbeuter (CLI), rawdog, 

6. Tests not working on Arch:
profile_syntax.exp (profile syntax)
fs_chroot.exp (chroot as user)
private-etc.exp

7. Disable /dev/tcp in bash. Compiled time: --enable-net-redirections, --disable-net-redirections
ksh and zsh seem to have it.

Tests:
a)
cat </dev/tcp/time.nist.gov/13

b)
exec 3<>/dev/tcp/www.google.com/80
echo -e "GET / HTTP/1.1\r\nhost: http://www.google.com\r\nConnection: close\r\n\r\n" >&3
cat <&3

c) A list of attacks
http://www.lanmaster53.com/2011/05/7-linux-shells-using-built-in-tools/

8. SELinux

Firefox selinux disabled (RedHat): http://danwalsh.livejournal.com/72697.html
Firefox selinux enabled (Gentoo hardened): http://blog.siphos.be/2015/08/why-we-do-confine-firefox/
"desktops are notoriously difficult to use a mandatory access control system on"

9. blacklist .muttrc, contains passwords in clear text

10. abstract unix socket bridge, example for ibus:

before the sandbox is started
socat UNIX-LISTEN:/tmp/mysoc,fork ABSTRACT-CONNECT:/tmp/dbus-awBoQTCc &

in sandbox
socat ABSTRACT-LISTEN:/tmp/dbus-awBoQTCc,fork UNIX-CONNECT:/tmp/mysock

12. do not allow symlinks for --bind

13. While using --net=eth0 assign the name of the interface inside the sandbox as eth0

15. do not attempt to mount /sys if unmount fails

$ firejail --noprofile --chroot=/tmp/chroot
Parent pid 13915, child pid 13916
Warning: cannot mount tmpfs on top of /var/log
Warning: cannot find /var/run/utmp
Warning: cannot find home directory
Dropping all Linux capabilities and enforcing default seccomp filter
Warning: failed to unmount /sys
Warning: failed to mount /sys
Warning: cannot disable /sys/firmware directory
Warning: cannot disable /sys/hypervisor directory
Warning: cannot disable /sys/fs directory
Warning: cannot disable /sys/module directory
Warning: cannot disable /sys/power directory
Child process initialized

16. add support for --ip, --iprange, --mac and --mtu for --interface option

17. private-home clashing with blacklist
whitelist clashing with blacklist

19. Try --overlay on a Ubuntu 14.04 32bit.Without adding --dns, there will be no network connectivity - see issue 151

21. restrict chars in filenames

try to open url-encoded filenames

const char badChars[] = "-\n\r ,;'\\<\""; 
(https://www.securecoding.cert.org/confluence/display/c/MSC09-C.+Character+encoding%3A+Use+subset+of+ASCII+for+safety)

strip = array("~", "`", "!", "@", "#", "$", "%", "^", "&", "*", "(", ")", "_", "=", "+", "[", "{", "]",
                       "}", "\\", "|", ";", ":", "\"", "'", "&#8216;", "&#8217;", "&#8220;", "&#8221;", "&#8211;", "&#8212;",
                       "—", "–", ",", "<", ".", ">", "/", "?");
(https://github.com/vito/chyrp/blob/35c646dda657300b345a233ab10eaca7ccd4ec10/includes/helpers.php#L516)

$special_chars = array("?", "[", "]", "/", "\\", "=", "<", ">", ":", ";", ",", "'", "\"", "&", "$", "#", "*", "(", ")", "|", "~", "`", "!", "{", "}");
(wordpress)

rework the calls to invalid_filename(), depending if globing is allowed or not, include * in the list for non-globing files

The POSIX standard defines what a “portable filename” is. This turns out to be just A-Z, a-z, 0-9, <period>, <underscore>, and <hyphen>
http://pubs.opengroup.org/onlinepubs/9699919799/basedefs/V1_chap03.html#tag_03_276

22. --shutdown does not clear sandboxes started with --join on Debian jessie