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don't allow ctty to be set to ctty - infinite kernel recursion

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Obtained from: 1.1.5.1
This commit is contained in:
Andrey A. Chernov 1994-12-04 01:46:13 +00:00
parent 903448b1da
commit cdbbd9cfaf
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=4939
1 changed files with 3 additions and 1 deletions
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4
sys/kern/tty_tty.c
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@ -31,7 +31,7 @@
* SUCH DAMAGE.
*
* @(#)tty_tty.c 8.2 (Berkeley) 9/23/93
* $Id$
* $Id: tty_tty.c,v 1.3 1994/08/02 07:42:57 davidg Exp $
*/
/*
@ -128,6 +128,8 @@ cttyioctl(dev, cmd, addr, flag, p)
if (ttyvp == NULL)
return (EIO);
if (cmd == TIOCSCTTY) /* don't allow controlling tty to be set */
return EINVAL; /* to controlling tty -- infinite recursion */
if (cmd == TIOCNOTTY) {
if (!SESS_LEADER(p)) {
p->p_flag &= ~P_CONTROLT;