Re: [kbd] [PATCH] vlock: Handle tty dying

["Dmitry V. Levin" <ldv@altlinux.org>]

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Hi,

On Fri, Sep 26, 2014 at 05:42:14AM +0000, Kyle Manna wrote:
> Hi guys,
> 
> I ran into a problem where if vlock was running over ssh and the ssh
> session died my system logs would get spammed by the now orphaned vlock
> process on Arch Linux:
> 
>     Sep 25 20:51:12 hostname vlock[31336]: pam_unix(vlock:auth): auth could not identify password for [user]
>     Sep 25 20:51:13 hostname vlock[31336]: pam_unix(vlock:auth): auth could not identify password for [user]
>     Sep 25 20:51:14 hostname vlock[31336]: pam_unix(vlock:auth): auth could not identify password for [user]
> 
> I was able to re-create this in many other situations (ssh, xterm
> window/tab, tmux window/pane, etc).
> 
> The patch know checks for a tty on stdin where PAM will likely ask for
> the password and exits if it's not found.

I've never seen this myself because in systems where I use vlock
pam_authenticate consistently returns PAM_INCOMPLETE in such cases.

I'll shortly post patches to handle these cases gracefully.


-- 
ldv

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