Re: No TTY present message on UART and display. Troubleshooting help required.

Would !requiretty provide an immediate if only temporary fix?

On Mon, May 27, 2019, 09:27 Todd C. Miller <[email protected]> wrote:

> On Mon, 27 May 2019 16:31:12 +0300, Semion Nadezhdin wrote:
>
> > I am completely at loss: suddenly sudo started to complain about no tty
> > being present. The deal is with uart and display tty(/dev/tty1 and
> > /dev/console agettys). Is there a way to troubleshoot what is actually
> > missing for sudo to recognize tty being present? Executing tty command
> > in the same terminal returns proper /dev/tty1 and /dev/console
> > accordingly. Custom linux distro with latest major kernel version.
>
> The sudo debug output may provide some more information.  Add the
> following line to /etc/sudo.conf (creating it if needed).
>
> Debug sudo /var/log/sudo_debug util@debug
>
> You should see lines referencing get_process_ttyname, sudo_ttyname_dev_v1,
> sudo_ttyname_scan and sudo_dev_check in the debug log.
>
> On Linux, sudo gets the tty based field 7 of /proc/self/stat and
> then tries to find the device name that corresponds to that device
> number in /dev.
>
>  - todd
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