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Make the PTY drivers cloning algorithm create "CHEAPCLONE" dev_t,

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so that some twit cannot allocate all 256 PTY's with "ls -l".
This commit is contained in:
Poul-Henning Kamp 2001-05-25 13:23:42 +00:00
parent 698c326a2e
commit 5696db457d
1 changed files with 12 additions and 11 deletions
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23
sys/kern/tty_pty.c
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@ -59,7 +59,7 @@ static MALLOC_DEFINE(M_PTY, "ptys", "pty data structures");
static void ptsstart __P((struct tty *tp));
static void ptsstop __P((struct tty *tp, int rw));
static void ptcwakeup __P((struct tty *tp, int flag));
static dev_t ptyinit __P((int n));
static dev_t ptyinit __P((dev_t cdev));
static d_open_t ptsopen;
static d_close_t ptsclose;
@ -126,6 +126,7 @@ struct pt_ioctl {
#define PF_NOSTOP 0x40
#define PF_UCNTL 0x80 /* user control mode */
static char *names = "pqrsPQRS";
/*
* This function creates and initializes a pts/ptc pair
*
@ -136,13 +137,14 @@ struct pt_ioctl {
* than 256 ptys.
*/
static dev_t
ptyinit(n)
int n;
ptyinit(dev_t devc)
{
dev_t devs, devc;
char *names = "pqrsPQRS";
dev_t devs;
struct pt_ioctl *pt;
int n;
devc->si_flags &= ~SI_CHEAPCLONE;
n = minor(devc);
/* For now we only map the lower 8 bits of the minor */
if (n & ~0xff)
return (NODEV);
@ -150,8 +152,7 @@ ptyinit(n)
pt = malloc(sizeof(*pt), M_PTY, M_WAITOK | M_ZERO);
pt->devs = devs = make_dev(&pts_cdevsw, n,
UID_ROOT, GID_WHEEL, 0666, "tty%c%r", names[n / 32], n % 32);
pt->devc = devc = make_dev(&ptc_cdevsw, n,
UID_ROOT, GID_WHEEL, 0666, "pty%c%r", names[n / 32], n % 32);
pt->devc = devc;
devs->si_drv1 = devc->si_drv1 = pt;
devs->si_tty = devc->si_tty = &pt->pt_tty;
@ -170,8 +171,6 @@ ptsopen(dev, flag, devtype, p)
int error;
struct pt_ioctl *pti;
if (!dev->si_drv1)
ptyinit(minor(dev));
if (!dev->si_drv1)
return(ENXIO);
pti = dev->si_drv1;
@ -334,7 +333,7 @@ ptcopen(dev, flag, devtype, p)
struct pt_ioctl *pti;
if (!dev->si_drv1)
ptyinit(minor(dev));
ptyinit(dev);
if (!dev->si_drv1)
return(ENXIO);
tp = dev->si_tty;
@ -836,7 +835,9 @@ pty_clone(arg, name, namelen, dev)
u += name[4] - 'a' + 10;
else
return;
*dev = ptyinit(u);
*dev = make_dev(&ptc_cdevsw, u,
UID_ROOT, GID_WHEEL, 0666, "pty%c%r", names[u / 32], u % 32);
(*dev)->si_flags |= SI_CHEAPCLONE;
return;
}