diff options
| author | mbr <mbr@FreeBSD.org> | 2006-09-23 14:44:14 +0000 |
|---|---|---|
| committer | mbr <mbr@FreeBSD.org> | 2006-09-23 14:44:14 +0000 |
| commit | 35537661a5a12e34fee8a553cd22fc044352974b (patch) | |
| tree | 16e267dd080cf4a82e8df9a801c23c96b526d61b /sys/kern/tty_tty.c | |
| parent | 98bfdf3a78586aa410625c6677d0977862ea27a8 (diff) | |
| download | FreeBSD-src-35537661a5a12e34fee8a553cd22fc044352974b.zip FreeBSD-src-35537661a5a12e34fee8a553cd22fc044352974b.tar.gz | |
If /dev/tty gets opened after your controlling terminal has been revoked
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
Diffstat (limited to 'sys/kern/tty_tty.c')
| -rw-r--r-- | sys/kern/tty_tty.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/sys/kern/tty_tty.c b/sys/kern/tty_tty.c index 5a99d25..b83f924 100644 --- a/sys/kern/tty_tty.c +++ b/sys/kern/tty_tty.c @@ -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v_rdev == NULL) { + /* e.g. s_ttyvp was revoked */ + return; + } else *dev = curthread-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); } |
