I checked on the pam side as well.  You may want to look at
upstream/pam/modules/pam_access configuration files.  Valid names should be
in ttyname() form only.  Modules pam_securetty and pam_smack only take a
valid pam name as a string.  Nothing hard-coded.  It would be an interesting
experiment if you explicitly allow tty1 ... tty# in
/etc/security/access.conf to see if that works on your system.  There you
can run strace to see where it gets set.

-----Original Message-----
From: Dev [mailto:[email protected]] On Behalf Of Schaufler, Casey
Sent: Monday, December 15, 2014 8:59 AM
To: Zaman, Imran; [email protected]
Cc: Laako, Jussi
Subject: Re: [Dev] SMACK Labels for /dev/snd/*

> -----Original Message-----
> From: Dev [mailto:[email protected]] On Behalf Of Zaman, 
> Imran
> Sent: Monday, December 15, 2014 3:18 AM
> To: [email protected]
> Cc: Laako, Jussi
> Subject: [Dev] SMACK Labels for /dev/snd/*
> Importance: High
> 
> Hei!
> 
> Recently we have encountered an issue that if a PAM user session has 
> PAM_TTY set as "tty1", then it sets appropriate smack labels for
/dev/snd/*.

What label do the files get?

> otherwise the smack labels are not set appropriately for any other 
> value and the devices become inaccessible.

What label do they get? What would you like it to be?

> 
> Can someone please indicate,
> a- Which component is responsible for setting up the smack lables for
> /dev/snd/* on the fly? Is it systemd?
> b- Why is it hard-coded such that if PAM session has PAM_TTY set to "tty1"
> then it works correctly otherwise not e.g. for "tty7" etc?

/lib/udev/rules.d is the repository for device labeling rules.

> I would really appreciate if someone (or related person) responds at 
> the earliest :-)

Wouldn't we all? :)

> BR
> imran
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