Re: Strange behaviour of devfs wrt /dev/tty

Richard Gooch (Richard.Gooch@atnf.CSIRO.AU)
Sun, 26 Apr 1998 12:07:46 +1000

Roderich Schupp writes:
> I noticed the following strange behaviour with devfs (patch-v27,
> kernel 2.1.98). If some program opens /dev/tty (e.g. "cat < /dev/tty")
> /dev/tty suddenly changes owner/group (to the uid/gid of the
> program opening the device) and permissions (600). The problem is:
> all other processes on the system see the _same_ permissions
> of /dev/tty. Shouldn't that be visible only to the processes with
> the same controlling terminal?

In fact, the ownership/permissions shouldn't be changed at all for
/dev/tty, since it is a pseudo-private device anyway (locking it away
from other users through permissions doesn't make sense, since it is
already locked away).
I've fixed it so that uid/gid = 0/0 and mode = crw-rw-rw-. This fix
will be in devfs-patch-v28. Watch the list for the announcement when
it comes. If you desperately need a fix now, let me know and I'll
produce one.

Thanks for spotting this one.

Regards,

Richard....

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