Note: This is a public test instance of Red Hat Bugzilla. The data contained within is a snapshot of the live data so any changes you make will not be reflected in the production Bugzilla. Email is disabled so feel free to test any aspect of the site that you want. File any problems you find or give feedback at bugzilla.redhat.com.

Bug 704442

Summary: allow root login on devices from /sys/class/tty/console/active
Product: [Fedora] Fedora Reporter: Dan Horák <dan>
Component: pamAssignee: Tomas Mraz <tmraz>
Status: CLOSED NEXTRELEASE QA Contact: Fedora Extras Quality Assurance <extras-qa>
Severity: unspecified Docs Contact:
Priority: unspecified    
Version: 15CC: brueckner, jstodola, tmraz
Target Milestone: ---   
Target Release: ---   
Hardware: Unspecified   
OS: Unspecified   
URL: https://fedorahosted.org/linux-pam/ticket/1
Whiteboard:
Fixed In Version: pam-1.1.4-1.fc16 Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2011-08-30 20:45:21 UTC Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Bug Depends On:    
Bug Blocks: 467765    
Attachments:
Description Flags
allow root login on devices from /sys/class/tty/console/active none

Description Dan Horák 2011-05-13 07:29:50 UTC 
Created attachment 498708 [details]
allow root login on devices from /sys/class/tty/console/active

root should be allowed to login on devices from "/sys/class/tty/console/active". On s390x the kernel presents various consoles (z/VM console, HMC console for LPARs) as /dev/ttyS? and with the recent switch from upstart to systemd the init process doesn't call /sbin/securetty to add the serial line device to /etc/securetty when getty is started.

The /sys/class/tty/console/active file was added in this commit - 
http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=fbc92a3455577ab17615cbcb91826399061bd789

From a discussion with Lennart on #systemd:
<sharkcz> we have a problem in F-15 on system with main console on ttyS0 where root can't log in because ttyS0 is not /etc/securetty, upstart (or better upstart job in initscripts) took care of that earlier
<mezcalero> sharkcz: pam_securetty has been updated to check console= from the kernel cmdline
<mezcalero> and allow that too
<sharkcz> ah, but on s390x the console= is not used and the kernel uses ttyS0 by default
<mezcalero> sharkcz: hmm, i guess we should update pam_securetty to check /sys/class/tty/console/active instead of the cmdline
<mezcalero> that should work for you, too, then, right?
<sharkcz> mezcalero: yep, looks like it has the correct value
<mezcalero> sharkcz: it's actually a list of values
<mezcalero> sharkcz: because you can pass console= multiple times on the kernel cmdline
<mezcalero> sharkcz: anyway, such a fix should be simple to do
<mezcalero> sharkcz: for compat with older kernels the current cmdline check probably should stay in pam_securetty
<mezcalero> but the new check used if /sys/class/tty/console/active can be opened