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Correct an oversight in jail() that allowed processes in jail to access

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ptys in ways that might be unethical, especially towards processes not in
jail, or in other jails.

Submitted by:	phk
Reviewed by:	rwatson
Approved by:	jkh
This commit is contained in:
Robert Watson 2000-02-09 03:32:11 +00:00
parent 0db018f059
commit 35a0a88fda
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=57070
1 changed files with 8 additions and 1 deletions
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9
sys/kern/tty_pty.c
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@ -118,6 +118,7 @@ struct pt_ioctl {
u_char pt_ucntl;
struct tty pt_tty;
dev_t devs, devc;
struct prison *pt_prison;
};
#define PF_PKT 0x08 /* packet mode */
@ -170,6 +171,7 @@ ptsopen(dev, flag, devtype, p)
int error;
int minr;
dev_t nextdev;
struct pt_ioctl *pti;
/*
* XXX: Gross hack for DEVFS:
@ -187,6 +189,7 @@ ptsopen(dev, flag, devtype, p)
ptyinit(minor(dev));
if (!dev->si_drv1)
return(ENXIO);
pti = dev->si_drv1;
tp = dev->si_tty;
if ((tp->t_state & TS_ISOPEN) == 0) {
ttychars(tp); /* Set up default chars */
@ -195,8 +198,11 @@ ptsopen(dev, flag, devtype, p)
tp->t_lflag = TTYDEF_LFLAG;
tp->t_cflag = TTYDEF_CFLAG;
tp->t_ispeed = tp->t_ospeed = TTYDEF_SPEED;
} else if (tp->t_state & TS_XCLUDE && suser(p))
} else if (tp->t_state & TS_XCLUDE && suser(p)) {
return (EBUSY);
} else if (pti->pt_prison != p->p_prison) {
return (EBUSY);
}
if (tp->t_oproc) /* Ctrlr still around. */
(void)(*linesw[tp->t_line].l_modem)(tp, 1);
while ((tp->t_state & TS_CARR_ON) == 0) {
@ -354,6 +360,7 @@ ptcopen(dev, flag, devtype, p)
(void)(*linesw[tp->t_line].l_modem)(tp, 1);
tp->t_lflag &= ~EXTPROC;
pti = dev->si_drv1;
pti->pt_prison = p->p_prison;
pti->pt_flags = 0;
pti->pt_send = 0;
pti->pt_ucntl = 0;