mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-06 04:36:40 +07:00
69f63c5c34
We add a check of the return value of tty_ldisc_ref(), which is checked 7 out of 8 times, e.g.: 149 ld = tty_ldisc_ref(tty); 150 if (ld != NULL) { 151 if (ld->set_termios) 152 (ld->set_termios)(tty, &old_termios); 153 tty_ldisc_deref(ld); 154 } This defect was found automatically by Coverity Prevent, a static analysis tool. (akpm: presumably `ld' is never NULL. Oh well) Signed-off-by: Zaur Kambarov <zkambarov@coverity.com> Cc: Alan Cox <alan@lxorguk.ukuu.org.uk> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
552 lines
14 KiB
C
552 lines
14 KiB
C
/*
|
|
* linux/drivers/char/tty_ioctl.c
|
|
*
|
|
* Copyright (C) 1991, 1992, 1993, 1994 Linus Torvalds
|
|
*
|
|
* Modified by Fred N. van Kempen, 01/29/93, to add line disciplines
|
|
* which can be dynamically activated and de-activated by the line
|
|
* discipline handling modules (like SLIP).
|
|
*/
|
|
|
|
#include <linux/types.h>
|
|
#include <linux/termios.h>
|
|
#include <linux/errno.h>
|
|
#include <linux/sched.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/major.h>
|
|
#include <linux/tty.h>
|
|
#include <linux/fcntl.h>
|
|
#include <linux/string.h>
|
|
#include <linux/mm.h>
|
|
#include <linux/module.h>
|
|
#include <linux/bitops.h>
|
|
|
|
#include <asm/io.h>
|
|
#include <asm/uaccess.h>
|
|
#include <asm/system.h>
|
|
|
|
#undef TTY_DEBUG_WAIT_UNTIL_SENT
|
|
|
|
#undef DEBUG
|
|
|
|
/*
|
|
* Internal flag options for termios setting behavior
|
|
*/
|
|
#define TERMIOS_FLUSH 1
|
|
#define TERMIOS_WAIT 2
|
|
#define TERMIOS_TERMIO 4
|
|
|
|
void tty_wait_until_sent(struct tty_struct * tty, long timeout)
|
|
{
|
|
DECLARE_WAITQUEUE(wait, current);
|
|
|
|
#ifdef TTY_DEBUG_WAIT_UNTIL_SENT
|
|
char buf[64];
|
|
|
|
printk(KERN_DEBUG "%s wait until sent...\n", tty_name(tty, buf));
|
|
#endif
|
|
if (!tty->driver->chars_in_buffer)
|
|
return;
|
|
add_wait_queue(&tty->write_wait, &wait);
|
|
if (!timeout)
|
|
timeout = MAX_SCHEDULE_TIMEOUT;
|
|
do {
|
|
#ifdef TTY_DEBUG_WAIT_UNTIL_SENT
|
|
printk(KERN_DEBUG "waiting %s...(%d)\n", tty_name(tty, buf),
|
|
tty->driver->chars_in_buffer(tty));
|
|
#endif
|
|
set_current_state(TASK_INTERRUPTIBLE);
|
|
if (signal_pending(current))
|
|
goto stop_waiting;
|
|
if (!tty->driver->chars_in_buffer(tty))
|
|
break;
|
|
timeout = schedule_timeout(timeout);
|
|
} while (timeout);
|
|
if (tty->driver->wait_until_sent)
|
|
tty->driver->wait_until_sent(tty, timeout);
|
|
stop_waiting:
|
|
set_current_state(TASK_RUNNING);
|
|
remove_wait_queue(&tty->write_wait, &wait);
|
|
}
|
|
|
|
EXPORT_SYMBOL(tty_wait_until_sent);
|
|
|
|
static void unset_locked_termios(struct termios *termios,
|
|
struct termios *old,
|
|
struct termios *locked)
|
|
{
|
|
int i;
|
|
|
|
#define NOSET_MASK(x,y,z) (x = ((x) & ~(z)) | ((y) & (z)))
|
|
|
|
if (!locked) {
|
|
printk(KERN_WARNING "Warning?!? termios_locked is NULL.\n");
|
|
return;
|
|
}
|
|
|
|
NOSET_MASK(termios->c_iflag, old->c_iflag, locked->c_iflag);
|
|
NOSET_MASK(termios->c_oflag, old->c_oflag, locked->c_oflag);
|
|
NOSET_MASK(termios->c_cflag, old->c_cflag, locked->c_cflag);
|
|
NOSET_MASK(termios->c_lflag, old->c_lflag, locked->c_lflag);
|
|
termios->c_line = locked->c_line ? old->c_line : termios->c_line;
|
|
for (i=0; i < NCCS; i++)
|
|
termios->c_cc[i] = locked->c_cc[i] ?
|
|
old->c_cc[i] : termios->c_cc[i];
|
|
}
|
|
|
|
static void change_termios(struct tty_struct * tty, struct termios * new_termios)
|
|
{
|
|
int canon_change;
|
|
struct termios old_termios = *tty->termios;
|
|
struct tty_ldisc *ld;
|
|
|
|
/*
|
|
* Perform the actual termios internal changes under lock.
|
|
*/
|
|
|
|
|
|
/* FIXME: we need to decide on some locking/ordering semantics
|
|
for the set_termios notification eventually */
|
|
down(&tty->termios_sem);
|
|
|
|
*tty->termios = *new_termios;
|
|
unset_locked_termios(tty->termios, &old_termios, tty->termios_locked);
|
|
canon_change = (old_termios.c_lflag ^ tty->termios->c_lflag) & ICANON;
|
|
if (canon_change) {
|
|
memset(&tty->read_flags, 0, sizeof tty->read_flags);
|
|
tty->canon_head = tty->read_tail;
|
|
tty->canon_data = 0;
|
|
tty->erasing = 0;
|
|
}
|
|
|
|
|
|
if (canon_change && !L_ICANON(tty) && tty->read_cnt)
|
|
/* Get characters left over from canonical mode. */
|
|
wake_up_interruptible(&tty->read_wait);
|
|
|
|
/* See if packet mode change of state. */
|
|
|
|
if (tty->link && tty->link->packet) {
|
|
int old_flow = ((old_termios.c_iflag & IXON) &&
|
|
(old_termios.c_cc[VSTOP] == '\023') &&
|
|
(old_termios.c_cc[VSTART] == '\021'));
|
|
int new_flow = (I_IXON(tty) &&
|
|
STOP_CHAR(tty) == '\023' &&
|
|
START_CHAR(tty) == '\021');
|
|
if (old_flow != new_flow) {
|
|
tty->ctrl_status &= ~(TIOCPKT_DOSTOP | TIOCPKT_NOSTOP);
|
|
if (new_flow)
|
|
tty->ctrl_status |= TIOCPKT_DOSTOP;
|
|
else
|
|
tty->ctrl_status |= TIOCPKT_NOSTOP;
|
|
wake_up_interruptible(&tty->link->read_wait);
|
|
}
|
|
}
|
|
|
|
if (tty->driver->set_termios)
|
|
(*tty->driver->set_termios)(tty, &old_termios);
|
|
|
|
ld = tty_ldisc_ref(tty);
|
|
if (ld != NULL) {
|
|
if (ld->set_termios)
|
|
(ld->set_termios)(tty, &old_termios);
|
|
tty_ldisc_deref(ld);
|
|
}
|
|
up(&tty->termios_sem);
|
|
}
|
|
|
|
static int set_termios(struct tty_struct * tty, void __user *arg, int opt)
|
|
{
|
|
struct termios tmp_termios;
|
|
struct tty_ldisc *ld;
|
|
int retval = tty_check_change(tty);
|
|
|
|
if (retval)
|
|
return retval;
|
|
|
|
if (opt & TERMIOS_TERMIO) {
|
|
memcpy(&tmp_termios, tty->termios, sizeof(struct termios));
|
|
if (user_termio_to_kernel_termios(&tmp_termios,
|
|
(struct termio __user *)arg))
|
|
return -EFAULT;
|
|
} else {
|
|
if (user_termios_to_kernel_termios(&tmp_termios,
|
|
(struct termios __user *)arg))
|
|
return -EFAULT;
|
|
}
|
|
|
|
ld = tty_ldisc_ref(tty);
|
|
|
|
if (ld != NULL) {
|
|
if ((opt & TERMIOS_FLUSH) && ld->flush_buffer)
|
|
ld->flush_buffer(tty);
|
|
tty_ldisc_deref(ld);
|
|
}
|
|
|
|
if (opt & TERMIOS_WAIT) {
|
|
tty_wait_until_sent(tty, 0);
|
|
if (signal_pending(current))
|
|
return -EINTR;
|
|
}
|
|
|
|
change_termios(tty, &tmp_termios);
|
|
return 0;
|
|
}
|
|
|
|
static int get_termio(struct tty_struct * tty, struct termio __user * termio)
|
|
{
|
|
if (kernel_termios_to_user_termio(termio, tty->termios))
|
|
return -EFAULT;
|
|
return 0;
|
|
}
|
|
|
|
static unsigned long inq_canon(struct tty_struct * tty)
|
|
{
|
|
int nr, head, tail;
|
|
|
|
if (!tty->canon_data || !tty->read_buf)
|
|
return 0;
|
|
head = tty->canon_head;
|
|
tail = tty->read_tail;
|
|
nr = (head - tail) & (N_TTY_BUF_SIZE-1);
|
|
/* Skip EOF-chars.. */
|
|
while (head != tail) {
|
|
if (test_bit(tail, tty->read_flags) &&
|
|
tty->read_buf[tail] == __DISABLED_CHAR)
|
|
nr--;
|
|
tail = (tail+1) & (N_TTY_BUF_SIZE-1);
|
|
}
|
|
return nr;
|
|
}
|
|
|
|
#ifdef TIOCGETP
|
|
/*
|
|
* These are deprecated, but there is limited support..
|
|
*
|
|
* The "sg_flags" translation is a joke..
|
|
*/
|
|
static int get_sgflags(struct tty_struct * tty)
|
|
{
|
|
int flags = 0;
|
|
|
|
if (!(tty->termios->c_lflag & ICANON)) {
|
|
if (tty->termios->c_lflag & ISIG)
|
|
flags |= 0x02; /* cbreak */
|
|
else
|
|
flags |= 0x20; /* raw */
|
|
}
|
|
if (tty->termios->c_lflag & ECHO)
|
|
flags |= 0x08; /* echo */
|
|
if (tty->termios->c_oflag & OPOST)
|
|
if (tty->termios->c_oflag & ONLCR)
|
|
flags |= 0x10; /* crmod */
|
|
return flags;
|
|
}
|
|
|
|
static int get_sgttyb(struct tty_struct * tty, struct sgttyb __user * sgttyb)
|
|
{
|
|
struct sgttyb tmp;
|
|
|
|
down(&tty->termios_sem);
|
|
tmp.sg_ispeed = 0;
|
|
tmp.sg_ospeed = 0;
|
|
tmp.sg_erase = tty->termios->c_cc[VERASE];
|
|
tmp.sg_kill = tty->termios->c_cc[VKILL];
|
|
tmp.sg_flags = get_sgflags(tty);
|
|
up(&tty->termios_sem);
|
|
|
|
return copy_to_user(sgttyb, &tmp, sizeof(tmp)) ? -EFAULT : 0;
|
|
}
|
|
|
|
static void set_sgflags(struct termios * termios, int flags)
|
|
{
|
|
termios->c_iflag = ICRNL | IXON;
|
|
termios->c_oflag = 0;
|
|
termios->c_lflag = ISIG | ICANON;
|
|
if (flags & 0x02) { /* cbreak */
|
|
termios->c_iflag = 0;
|
|
termios->c_lflag &= ~ICANON;
|
|
}
|
|
if (flags & 0x08) { /* echo */
|
|
termios->c_lflag |= ECHO | ECHOE | ECHOK |
|
|
ECHOCTL | ECHOKE | IEXTEN;
|
|
}
|
|
if (flags & 0x10) { /* crmod */
|
|
termios->c_oflag |= OPOST | ONLCR;
|
|
}
|
|
if (flags & 0x20) { /* raw */
|
|
termios->c_iflag = 0;
|
|
termios->c_lflag &= ~(ISIG | ICANON);
|
|
}
|
|
if (!(termios->c_lflag & ICANON)) {
|
|
termios->c_cc[VMIN] = 1;
|
|
termios->c_cc[VTIME] = 0;
|
|
}
|
|
}
|
|
|
|
static int set_sgttyb(struct tty_struct * tty, struct sgttyb __user * sgttyb)
|
|
{
|
|
int retval;
|
|
struct sgttyb tmp;
|
|
struct termios termios;
|
|
|
|
retval = tty_check_change(tty);
|
|
if (retval)
|
|
return retval;
|
|
|
|
if (copy_from_user(&tmp, sgttyb, sizeof(tmp)))
|
|
return -EFAULT;
|
|
|
|
down(&tty->termios_sem);
|
|
termios = *tty->termios;
|
|
termios.c_cc[VERASE] = tmp.sg_erase;
|
|
termios.c_cc[VKILL] = tmp.sg_kill;
|
|
set_sgflags(&termios, tmp.sg_flags);
|
|
up(&tty->termios_sem);
|
|
change_termios(tty, &termios);
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
#ifdef TIOCGETC
|
|
static int get_tchars(struct tty_struct * tty, struct tchars __user * tchars)
|
|
{
|
|
struct tchars tmp;
|
|
|
|
tmp.t_intrc = tty->termios->c_cc[VINTR];
|
|
tmp.t_quitc = tty->termios->c_cc[VQUIT];
|
|
tmp.t_startc = tty->termios->c_cc[VSTART];
|
|
tmp.t_stopc = tty->termios->c_cc[VSTOP];
|
|
tmp.t_eofc = tty->termios->c_cc[VEOF];
|
|
tmp.t_brkc = tty->termios->c_cc[VEOL2]; /* what is brkc anyway? */
|
|
return copy_to_user(tchars, &tmp, sizeof(tmp)) ? -EFAULT : 0;
|
|
}
|
|
|
|
static int set_tchars(struct tty_struct * tty, struct tchars __user * tchars)
|
|
{
|
|
struct tchars tmp;
|
|
|
|
if (copy_from_user(&tmp, tchars, sizeof(tmp)))
|
|
return -EFAULT;
|
|
tty->termios->c_cc[VINTR] = tmp.t_intrc;
|
|
tty->termios->c_cc[VQUIT] = tmp.t_quitc;
|
|
tty->termios->c_cc[VSTART] = tmp.t_startc;
|
|
tty->termios->c_cc[VSTOP] = tmp.t_stopc;
|
|
tty->termios->c_cc[VEOF] = tmp.t_eofc;
|
|
tty->termios->c_cc[VEOL2] = tmp.t_brkc; /* what is brkc anyway? */
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
#ifdef TIOCGLTC
|
|
static int get_ltchars(struct tty_struct * tty, struct ltchars __user * ltchars)
|
|
{
|
|
struct ltchars tmp;
|
|
|
|
tmp.t_suspc = tty->termios->c_cc[VSUSP];
|
|
tmp.t_dsuspc = tty->termios->c_cc[VSUSP]; /* what is dsuspc anyway? */
|
|
tmp.t_rprntc = tty->termios->c_cc[VREPRINT];
|
|
tmp.t_flushc = tty->termios->c_cc[VEOL2]; /* what is flushc anyway? */
|
|
tmp.t_werasc = tty->termios->c_cc[VWERASE];
|
|
tmp.t_lnextc = tty->termios->c_cc[VLNEXT];
|
|
return copy_to_user(ltchars, &tmp, sizeof(tmp)) ? -EFAULT : 0;
|
|
}
|
|
|
|
static int set_ltchars(struct tty_struct * tty, struct ltchars __user * ltchars)
|
|
{
|
|
struct ltchars tmp;
|
|
|
|
if (copy_from_user(&tmp, ltchars, sizeof(tmp)))
|
|
return -EFAULT;
|
|
|
|
tty->termios->c_cc[VSUSP] = tmp.t_suspc;
|
|
tty->termios->c_cc[VEOL2] = tmp.t_dsuspc; /* what is dsuspc anyway? */
|
|
tty->termios->c_cc[VREPRINT] = tmp.t_rprntc;
|
|
tty->termios->c_cc[VEOL2] = tmp.t_flushc; /* what is flushc anyway? */
|
|
tty->termios->c_cc[VWERASE] = tmp.t_werasc;
|
|
tty->termios->c_cc[VLNEXT] = tmp.t_lnextc;
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* Send a high priority character to the tty.
|
|
*/
|
|
static void send_prio_char(struct tty_struct *tty, char ch)
|
|
{
|
|
int was_stopped = tty->stopped;
|
|
|
|
if (tty->driver->send_xchar) {
|
|
tty->driver->send_xchar(tty, ch);
|
|
return;
|
|
}
|
|
if (was_stopped)
|
|
start_tty(tty);
|
|
tty->driver->write(tty, &ch, 1);
|
|
if (was_stopped)
|
|
stop_tty(tty);
|
|
}
|
|
|
|
int n_tty_ioctl(struct tty_struct * tty, struct file * file,
|
|
unsigned int cmd, unsigned long arg)
|
|
{
|
|
struct tty_struct * real_tty;
|
|
void __user *p = (void __user *)arg;
|
|
int retval;
|
|
struct tty_ldisc *ld;
|
|
|
|
if (tty->driver->type == TTY_DRIVER_TYPE_PTY &&
|
|
tty->driver->subtype == PTY_TYPE_MASTER)
|
|
real_tty = tty->link;
|
|
else
|
|
real_tty = tty;
|
|
|
|
switch (cmd) {
|
|
#ifdef TIOCGETP
|
|
case TIOCGETP:
|
|
return get_sgttyb(real_tty, (struct sgttyb __user *) arg);
|
|
case TIOCSETP:
|
|
case TIOCSETN:
|
|
return set_sgttyb(real_tty, (struct sgttyb __user *) arg);
|
|
#endif
|
|
#ifdef TIOCGETC
|
|
case TIOCGETC:
|
|
return get_tchars(real_tty, p);
|
|
case TIOCSETC:
|
|
return set_tchars(real_tty, p);
|
|
#endif
|
|
#ifdef TIOCGLTC
|
|
case TIOCGLTC:
|
|
return get_ltchars(real_tty, p);
|
|
case TIOCSLTC:
|
|
return set_ltchars(real_tty, p);
|
|
#endif
|
|
case TCGETS:
|
|
if (kernel_termios_to_user_termios((struct termios __user *)arg, real_tty->termios))
|
|
return -EFAULT;
|
|
return 0;
|
|
case TCSETSF:
|
|
return set_termios(real_tty, p, TERMIOS_FLUSH | TERMIOS_WAIT);
|
|
case TCSETSW:
|
|
return set_termios(real_tty, p, TERMIOS_WAIT);
|
|
case TCSETS:
|
|
return set_termios(real_tty, p, 0);
|
|
case TCGETA:
|
|
return get_termio(real_tty, p);
|
|
case TCSETAF:
|
|
return set_termios(real_tty, p, TERMIOS_FLUSH | TERMIOS_WAIT | TERMIOS_TERMIO);
|
|
case TCSETAW:
|
|
return set_termios(real_tty, p, TERMIOS_WAIT | TERMIOS_TERMIO);
|
|
case TCSETA:
|
|
return set_termios(real_tty, p, TERMIOS_TERMIO);
|
|
case TCXONC:
|
|
retval = tty_check_change(tty);
|
|
if (retval)
|
|
return retval;
|
|
switch (arg) {
|
|
case TCOOFF:
|
|
if (!tty->flow_stopped) {
|
|
tty->flow_stopped = 1;
|
|
stop_tty(tty);
|
|
}
|
|
break;
|
|
case TCOON:
|
|
if (tty->flow_stopped) {
|
|
tty->flow_stopped = 0;
|
|
start_tty(tty);
|
|
}
|
|
break;
|
|
case TCIOFF:
|
|
if (STOP_CHAR(tty) != __DISABLED_CHAR)
|
|
send_prio_char(tty, STOP_CHAR(tty));
|
|
break;
|
|
case TCION:
|
|
if (START_CHAR(tty) != __DISABLED_CHAR)
|
|
send_prio_char(tty, START_CHAR(tty));
|
|
break;
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
return 0;
|
|
case TCFLSH:
|
|
retval = tty_check_change(tty);
|
|
if (retval)
|
|
return retval;
|
|
|
|
ld = tty_ldisc_ref(tty);
|
|
switch (arg) {
|
|
case TCIFLUSH:
|
|
if (ld && ld->flush_buffer)
|
|
ld->flush_buffer(tty);
|
|
break;
|
|
case TCIOFLUSH:
|
|
if (ld && ld->flush_buffer)
|
|
ld->flush_buffer(tty);
|
|
/* fall through */
|
|
case TCOFLUSH:
|
|
if (tty->driver->flush_buffer)
|
|
tty->driver->flush_buffer(tty);
|
|
break;
|
|
default:
|
|
tty_ldisc_deref(ld);
|
|
return -EINVAL;
|
|
}
|
|
tty_ldisc_deref(ld);
|
|
return 0;
|
|
case TIOCOUTQ:
|
|
return put_user(tty->driver->chars_in_buffer ?
|
|
tty->driver->chars_in_buffer(tty) : 0,
|
|
(int __user *) arg);
|
|
case TIOCINQ:
|
|
retval = tty->read_cnt;
|
|
if (L_ICANON(tty))
|
|
retval = inq_canon(tty);
|
|
return put_user(retval, (unsigned int __user *) arg);
|
|
case TIOCGLCKTRMIOS:
|
|
if (kernel_termios_to_user_termios((struct termios __user *)arg, real_tty->termios_locked))
|
|
return -EFAULT;
|
|
return 0;
|
|
|
|
case TIOCSLCKTRMIOS:
|
|
if (!capable(CAP_SYS_ADMIN))
|
|
return -EPERM;
|
|
if (user_termios_to_kernel_termios(real_tty->termios_locked, (struct termios __user *) arg))
|
|
return -EFAULT;
|
|
return 0;
|
|
|
|
case TIOCPKT:
|
|
{
|
|
int pktmode;
|
|
|
|
if (tty->driver->type != TTY_DRIVER_TYPE_PTY ||
|
|
tty->driver->subtype != PTY_TYPE_MASTER)
|
|
return -ENOTTY;
|
|
if (get_user(pktmode, (int __user *) arg))
|
|
return -EFAULT;
|
|
if (pktmode) {
|
|
if (!tty->packet) {
|
|
tty->packet = 1;
|
|
tty->link->ctrl_status = 0;
|
|
}
|
|
} else
|
|
tty->packet = 0;
|
|
return 0;
|
|
}
|
|
case TIOCGSOFTCAR:
|
|
return put_user(C_CLOCAL(tty) ? 1 : 0, (int __user *)arg);
|
|
case TIOCSSOFTCAR:
|
|
if (get_user(arg, (unsigned int __user *) arg))
|
|
return -EFAULT;
|
|
down(&tty->termios_sem);
|
|
tty->termios->c_cflag =
|
|
((tty->termios->c_cflag & ~CLOCAL) |
|
|
(arg ? CLOCAL : 0));
|
|
up(&tty->termios_sem);
|
|
return 0;
|
|
default:
|
|
return -ENOIOCTLCMD;
|
|
}
|
|
}
|
|
|
|
EXPORT_SYMBOL(n_tty_ioctl);
|