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If /dev/tty gets opened after your controlling terminal has been revoked

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you can't call tty_clone afterwords. OpenBSD and NetBSD both fail the
open call in that case, so we should do so as well. This can
be done in ctty_clone by returning with *dev==NULL. Admittedly this
causes open to return ENOENT, instead of ENXIO as on the other BSDs,
but this way requires the least touching of code.

Submitted by:  Nate Eldredge <nge@cs.hmc.edu>
PR:            83375

MFC:           1 week
This commit is contained in:
Martin Blapp 2006-09-23 14:44:14 +00:00
parent 07a8ebcc75
commit 153c21c8c1
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=162573
1 changed files with 5 additions and 1 deletions
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6
sys/kern/tty_tty.c
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@ -64,7 +64,11 @@ ctty_clone(void *arg, struct ucred *cred, char *name, int namelen,
*dev = ctty;
else if (curthread->td_proc->p_session->s_ttyvp == NULL)
*dev = ctty;
else
else if (curthread->td_proc->p_session->s_ttyvp->v_type == VBAD ||
curthread->td_proc->p_session->s_ttyvp->v_rdev == NULL) {
/* e.g. s_ttyvp was revoked */
return;
} else
*dev = curthread->td_proc->p_session->s_ttyvp->v_rdev;
dev_ref(*dev);
}