Date: Thu, 6 Jan 2011 21:09:05 -0800 From: Garrett Cooper <gcooper@FreeBSD.org> To: Craig Leres <leres@ee.lbl.gov> Cc: FreeBSD Current <freebsd-current@freebsd.org>, Ed Schouten <ed@freebsd.org> Subject: Re: xterm -C and TIOCCONS vs. PRIV_TTY_CONSOLE Message-ID: <AANLkTi=gHW=ShE_p=LPj-k1FC1e2-SpAWxyAsD=2MF7o@mail.gmail.com> In-Reply-To: <4D269B72.4040709@ee.lbl.gov> References: <4D268557.2090704@ee.lbl.gov> <AANLkTinWu9-ZP_D0ShfvAtDpbuRPWa81hLb3hw=OQoxX@mail.gmail.com> <4D268B98.3080906@ee.lbl.gov> <AANLkTinEG7SJ80Ljrecg%2Bq_TOGy8bicKVUPZRRpzieV%2B@mail.gmail.com> <4D269B72.4040709@ee.lbl.gov>
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On Thu, Jan 6, 2011 at 8:49 PM, Craig Leres <leres@ee.lbl.gov> wrote:
> On 01/06/11 20:05, Garrett Cooper wrote:
>> Just to make sure we're both on the same page:
>>
>> $ grep xterm /etc/ttys
>> ttyv0 "/usr/libexec/getty Pc" xterm on secure
>> ttyv1 "/usr/libexec/getty Pc" xterm on secure
>> ttyv2 "/usr/libexec/getty Pc" xterm on secure
>> ttyv3 "/usr/libexec/getty Pc" xterm on secure
>> ttyv4 "/usr/libexec/getty Pc" xterm on secure
>> ttyv5 "/usr/libexec/getty Pc" xterm on secure
>> ttyv6 "/usr/libexec/getty Pc" xterm on secure
>> ttyv7 "/usr/libexec/getty Pc" xterm on secure
>> ttyv8 "/usr/local/bin/xdm -nodaemon" xterm off secure
>
> No, that's not what mine looks like. I changed it to match and rebooted
> but it doesn't help with the TIOCCONS issue.
>
> When I run xinit, it starts up the xterm -C which does a TIOCCONS. The
> 8.1 kernel checks for PRIV_TTY_CONSOLE which isn't set and denies the
> request:
>
> case TIOCCONS:
> /* Set terminal as console TTY. */
> if (*(int *)data) {
> error = priv_check(td, PRIV_TTY_CONSOLE);
> if (error)
> return (error);
>
> /*
> * XXX: constty should really need to be locked!
> * XXX: allow disconnected constty's to be stolen!
> */
>
> if (constty == tp)
> return (0);
> if (constty != NULL)
> return (EBUSY);
>
> tty_unlock(tp);
> constty_set(tp);
> tty_lock(tp);
> } else if (constty == tp) {
> constty_clear();
> }
> return (0);
>
>
> There's nothing I see in all of /usr/src that turns on PRIV_TTY_CONSOLE
> in any case. You could rewrite the above like this:
>
> case TIOCCONS:
> /* Set terminal as console TTY. */
> if (*(int *)data) {
> return (EPERM)
> } else if (constty == tp) {
> constty_clear();
> }
> return (0);
>
> and it won't change any behavior.
Ok -- figured I would ask about the obvious. I wish I could help
you further right now, but unfortunately I have a lot on my plate.
I've CCed ed@ and the list again so that someone else might be able to
chime in and help you further.
Cheers,
-Garrett
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