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Date: Fri, 23 Jan 2015 20:46:27 +0300
From: "Dmitry V. Levin" <ldv@altlinux.org>
To: Linux console tools development discussion <kbd@lists.altlinux.org>
Message-ID: <20150123174626.GA9914@altlinux.org>
References: <20140926054204.GH3701@kylemanna.com>
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Subject: Re: [kbd] [PATCH] vlock: Handle tty dying
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Hi,

On Fri, Sep 26, 2014 at 05:42:14AM +0000, Kyle Manna wrote:
> Hi guys,
>=20
> 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:
>=20
>     Sep 25 20:51:12 hostname vlock[31336]: pam_unix(vlock:auth): auth cou=
ld not identify password for [user]
>     Sep 25 20:51:13 hostname vlock[31336]: pam_unix(vlock:auth): auth cou=
ld not identify password for [user]
>     Sep 25 20:51:14 hostname vlock[31336]: pam_unix(vlock:auth): auth cou=
ld not identify password for [user]
>=20
> I was able to re-create this in many other situations (ssh, xterm
> window/tab, tmux window/pane, etc).
>=20
> 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.


--=20
ldv

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