Only one X session for all normal users combined possible

Hi, I'm currently experimenting with the new xorg-server 1.16 with which it is possible to start and run the X server as a user.
Setup: No display manager running. startx is used. No modifications of global xserverrc or other files.
~/.xinitrc looks like this for all users:
startxfce4
As root it is possible to start multiple X sessions (on different virtual terminals of course).
But as a user only one X session is possible.
After user flo has started a X session on tty1, the following occurs:
Permissions for tty2 before startx
crw------- 1 boolian tty 4, 2 24. Jul 10:24 /dev/tty2
If I try to start a second X session via startx on another virtual terminal (here: tty2), the process aborts with the following message:
X.Org X Server 1.16.0
Release Date: 2014-07-16
X Protocol Version 11, Revision 0
Build Operating System: Linux 3.15.1-1-ARCH x86_64
Current Operating System: Linux flo.tower 3.15.6-1-ARCH #1 SMP PREEMPT Fri Jul 18 07:06:42 CEST 2014 x86_64
Kernel command line: BOOT_IMAGE=../vmlinuz-linux root=/dev/sda1 rw initrd=../initramfs-linux.img
Build Date: 18 July 2014 07:12:40PM
Current version of pixman: 0.32.6
Before reporting problems, check http://wiki.x.org
to make sure that you have the latest version.
Markers: (--) probed, (**) from config file, (==) default setting,
(++) from command line, (!!) notice, (II) informational,
(WW) warning, (EE) error, (NI) not implemented, (??) unknown.
(==) Log file: "/home/boolian/.local/share/xorg/Xorg.1.log", Time: Thu Jul 24 10:24:21 2014
(==) Using config directory: "/etc/X11/xorg.conf.d"
(EE)
Fatal server error:
(EE) xf86OpenConsole: Cannot open virtual console 2 (Permission denied)
(EE)
(EE)
Please consult the The X.Org Foundation support
at http://wiki.x.org
for help.
(EE) Please also check the log file at "/home/boolian/.local/share/xorg/Xorg.1.log" for additional information.
(EE)
(EE) Server terminated with error (1). Closing log file.
xinit: giving up
xinit: unable to connect to X server: Connection refused
xinit: server error
After this unsuccessful call to startx, the permissions for the tty2 have changed, but only the owner not the rwx flags.
crw------- 1 root tty 4, 2 24. Jul 10:24 /dev/tty2
Interestingly the permissions for the tty with the running X server stay as expected all the time.
crw------- 1 flo tty 4, 1 24. Jul 10:37 /dev/tty1
My first guess was, that the suid bit of Xorg.wrap has something to do with it. But I moved the binary and the behavior stayed the same.
Another guess is, that systemd-logind has something to do with it as it is repsonsible for the permissions (see [0] and [1]).
Can anybody reproduce this behaviour?
Has anybody hints where to go next? I'm currently building a new kernel with the audit framework enabled to check which process changes the permission of the tty when startx is called.
I'm reluctant to open a bug report as I know too little about the problem or whether it is a bug at all.
Greetings.
[0]http://dvdhrm.wordpress.com/2013/08/24/ … -on-linux/
[1]http://dvdhrm.wordpress.com/2013/08/24/ … ing-works/

I have captured all systemcalls which go to /dev/tty2 (which is dev with major 4 and minor 2) with the following auditctl line:
-a always,exit -F arch=x86_64 -S all -F devmajor=4 -F devminor=2 -F key=vt2222
This is the result:
[root@flo rules.d]# ausearch -i -k vt2222
type=CONFIG_CHANGE msg=audit(24.07.2014 13:19:49.400:83) : auid=flo ses=1 op="add rule" key=vt2222 list=exit res=yes
type=PROCTITLE msg=audit(24.07.2014 13:19:53.749:84) : proctitle=/sbin/agetty
type=PATH msg=audit(24.07.2014 13:19:53.749:84) : item=0 name=/dev/tty2 inode=24 dev=00:05 mode=character,620 ouid=root ogid=tty rdev=04:02 nametype=NORMAL
type=CWD msg=audit(24.07.2014 13:19:53.749:84) : cwd=/
type=SYSCALL msg=audit(24.07.2014 13:19:53.749:84) : arch=x86_64 syscall=stat success=yes exit=0 a0=0x6665a0 a1=0x7fffea504e50 a2=0x7fffea504e50 a3=0x666590 items=1 ppid=1 pid=5903 auid=unset uid=root gid=root euid=root suid=root fsuid=root egid=root sgid=root fsgid=root tty=tty2 ses=unset comm=login exe=/usr/bin/login key=vt2222
type=PROCTITLE msg=audit(24.07.2014 13:19:53.749:85) : proctitle=/sbin/agetty
type=PATH msg=audit(24.07.2014 13:19:53.749:85) : item=0 name=/dev/tty2 inode=24 dev=00:05 mode=character,620 ouid=root ogid=tty rdev=04:02 nametype=NORMAL
type=CWD msg=audit(24.07.2014 13:19:53.749:85) : cwd=/
type=SYSCALL msg=audit(24.07.2014 13:19:53.749:85) : arch=x86_64 syscall=lstat success=yes exit=0 a0=0x6665a0 a1=0x7fffea5050c0 a2=0x7fffea5050c0 a3=0x7fffea504d00 items=1 ppid=1 pid=5903 auid=unset uid=root gid=root euid=root suid=root fsuid=root egid=root sgid=root fsgid=root tty=tty2 ses=unset comm=login exe=/usr/bin/login key=vt2222
type=PROCTITLE msg=audit(24.07.2014 13:19:53.749:86) : proctitle=/sbin/agetty
type=PATH msg=audit(24.07.2014 13:19:53.749:86) : item=0 name=/dev/tty2 inode=24 dev=00:05 mode=character,620 ouid=root ogid=tty rdev=04:02 nametype=NORMAL
type=CWD msg=audit(24.07.2014 13:19:53.749:86) : cwd=/
type=SYSCALL msg=audit(24.07.2014 13:19:53.749:86) : arch=x86_64 syscall=access success=yes exit=0 a0=0x6665a0 a1=W_OK|R_OK a2=0x7fffea5050c0 a3=0x7fffea504d00 items=1 ppid=1 pid=5903 auid=unset uid=root gid=root euid=root suid=root fsuid=root egid=root sgid=root fsgid=root tty=tty2 ses=unset comm=login exe=/usr/bin/login key=vt2222
type=PROCTITLE msg=audit(24.07.2014 13:19:53.749:87) : proctitle=/sbin/agetty
type=PATH msg=audit(24.07.2014 13:19:53.749:87) : item=0 name=(null) inode=24 dev=00:05 mode=character,620 ouid=root ogid=tty rdev=04:02 nametype=NORMAL
type=SYSCALL msg=audit(24.07.2014 13:19:53.749:87) : arch=x86_64 syscall=fchown success=yes exit=0 a0=0x0 a1=0x0 a2=0x0 a3=0x7fffea504d00 items=1 ppid=1 pid=5903 auid=unset uid=root gid=root euid=root suid=root fsuid=root egid=root sgid=root fsgid=root tty=tty2 ses=unset comm=login exe=/usr/bin/login key=vt2222
type=PROCTITLE msg=audit(24.07.2014 13:19:53.749:88) : proctitle=/sbin/agetty
type=PATH msg=audit(24.07.2014 13:19:53.749:88) : item=0 name=(null) inode=24 dev=00:05 mode=character,620 ouid=root ogid=root rdev=04:02 nametype=NORMAL
type=SYSCALL msg=audit(24.07.2014 13:19:53.749:88) : arch=x86_64 syscall=fchmod success=yes exit=0 a0=0x0 a1=0600 a2=0x0 a3=0x7fffea504d00 items=1 ppid=1 pid=5903 auid=unset uid=root gid=root euid=root suid=root fsuid=root egid=root sgid=root fsgid=root tty=tty2 ses=unset comm=login exe=/usr/bin/login key=vt2222
type=PROCTITLE msg=audit(24.07.2014 13:19:53.749:89) : proctitle=/sbin/agetty
type=PATH msg=audit(24.07.2014 13:19:53.749:89) : item=0 name=/dev/tty2 inode=24 dev=00:05 mode=character,600 ouid=root ogid=root rdev=04:02 nametype=NORMAL
type=CWD msg=audit(24.07.2014 13:19:53.749:89) : cwd=/
type=SYSCALL msg=audit(24.07.2014 13:19:53.749:89) : arch=x86_64 syscall=open success=yes exit=0 a0=0x6665a0 a1=O_RDWR|O_NONBLOCK a2=0x7f7a7bb9edf0 a3=0x7fffea504ce0 items=1 ppid=1 pid=5903 auid=unset uid=root gid=root euid=root suid=root fsuid=root egid=root sgid=root fsgid=root tty=tty2 ses=unset comm=login exe=/usr/bin/login key=vt2222
type=PROCTITLE msg=audit(24.07.2014 13:19:54.409:91) : proctitle=/sbin/agetty
type=PATH msg=audit(24.07.2014 13:19:54.409:91) : item=0 name=(null) inode=24 dev=00:05 mode=character,600 ouid=root ogid=root rdev=04:02 nametype=NORMAL
type=SYSCALL msg=audit(24.07.2014 13:19:54.409:91) : arch=x86_64 syscall=fchown success=yes exit=0 a0=0x0 a1=0x3e8 a2=0x5 a3=0x683ce7 items=1 ppid=1 pid=5903 auid=flo uid=root gid=root euid=root suid=root fsuid=root egid=root sgid=users fsgid=root tty=tty2 ses=15 comm=login exe=/usr/bin/login key=vt2222
type=PROCTITLE msg=audit(24.07.2014 13:19:54.409:92) : proctitle=/sbin/agetty
type=PATH msg=audit(24.07.2014 13:19:54.409:92) : item=0 name=(null) inode=24 dev=00:05 mode=character,600 ouid=flo ogid=tty rdev=04:02 nametype=NORMAL
type=SYSCALL msg=audit(24.07.2014 13:19:54.409:92) : arch=x86_64 syscall=fchmod success=yes exit=0 a0=0x0 a1=0600 a2=0x5 a3=0x683ce7 items=1 ppid=1 pid=5903 auid=flo uid=root gid=root euid=root suid=root fsuid=root egid=root sgid=users fsgid=root tty=tty2 ses=15 comm=login exe=/usr/bin/login key=vt2222
type=PROCTITLE msg=audit(24.07.2014 13:19:54.413:93) : proctitle=login -- flo
type=PATH msg=audit(24.07.2014 13:19:54.413:93) : item=0 name=/dev/tty2 inode=24 dev=00:05 mode=character,600 ouid=flo ogid=tty rdev=04:02 nametype=NORMAL
type=CWD msg=audit(24.07.2014 13:19:54.413:93) : cwd=/
type=SYSCALL msg=audit(24.07.2014 13:19:54.413:93) : arch=x86_64 syscall=open success=yes exit=3 a0=0x6665a0 a1=O_RDWR|O_NONBLOCK a2=0x0 a3=0x7fffea504d00 items=1 ppid=5903 pid=5914 auid=flo uid=root gid=users euid=root suid=root fsuid=root egid=users sgid=users fsgid=users tty=tty2 ses=15 comm=login exe=/usr/bin/login key=vt2222
type=PROCTITLE msg=audit(24.07.2014 13:19:54.416:94) : proctitle=/usr/bin/tty
type=PATH msg=audit(24.07.2014 13:19:54.416:94) : item=0 name=/dev/tty2 inode=24 dev=00:05 mode=character,600 ouid=flo ogid=tty rdev=04:02 nametype=NORMAL
type=CWD msg=audit(24.07.2014 13:19:54.416:94) : cwd=/home/flo
type=SYSCALL msg=audit(24.07.2014 13:19:54.416:94) : arch=x86_64 syscall=stat success=yes exit=0 a0=0x10d4060 a1=0x7fff388a7470 a2=0x7fff388a7470 a3=0x10d4050 items=1 ppid=5915 pid=5916 auid=flo uid=flo gid=users euid=flo suid=flo fsuid=flo egid=users sgid=users fsgid=users tty=tty2 ses=15 comm=tty exe=/usr/bin/tty key=vt2222
type=PROCTITLE msg=audit(24.07.2014 13:20:38.319:95) : proctitle=/usr/bin/Xorg.bin
type=PATH msg=audit(24.07.2014 13:20:38.319:95) : item=0 name=/dev/tty2 inode=24 dev=00:05 mode=character,600 ouid=root ogid=tty rdev=04:02 nametype=NORMAL
type=CWD msg=audit(24.07.2014 13:20:38.319:95) : cwd=/home/flo
type=SYSCALL msg=audit(24.07.2014 13:20:38.319:95) : arch=x86_64 syscall=open success=no exit=-13(Permission denied) a0=0x82715c a1=O_RDWR|O_NONBLOCK a2=0x0 a3=0x0 items=1 ppid=5937 pid=5938 auid=flo uid=flo gid=users euid=flo suid=flo fsuid=flo egid=users sgid=users fsgid=users tty=tty2 ses=15 comm=Xorg.bin exe=/usr/bin/Xorg.bin key=vt2222
Look at the last block in PATH and the block before the last. The ouid changes (owner of file) but there is no process which does this.
Am I deciphering this right?
Greetings

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