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1/*
2 * Copyright (C) 1992 obz under the linux copyright
3 *
4 * Dynamic diacritical handling - aeb@cwi.nl - Dec 1993
5 * Dynamic keymap and string allocation - aeb@cwi.nl - May 1994
6 * Restrict VT switching via ioctl() - grif@cs.ucr.edu - Dec 1995
7 * Some code moved for less code duplication - Andi Kleen - Mar 1997
8 * Check put/get_user, cleanups - acme@conectiva.com.br - Jun 2001
9 */
10
11#include <linux/types.h>
12#include <linux/errno.h>
13#include <linux/sched.h>
14#include <linux/tty.h>
15#include <linux/timer.h>
16#include <linux/kernel.h>
17#include <linux/compat.h>
18#include <linux/module.h>
19#include <linux/kd.h>
20#include <linux/vt.h>
21#include <linux/string.h>
22#include <linux/slab.h>
23#include <linux/major.h>
24#include <linux/fs.h>
25#include <linux/console.h>
26#include <linux/consolemap.h>
27#include <linux/signal.h>
28#include <linux/suspend.h>
29#include <linux/timex.h>
30
31#include <asm/io.h>
32#include <linux/uaccess.h>
33
34#include <linux/kbd_kern.h>
35#include <linux/vt_kern.h>
36#include <linux/kbd_diacr.h>
37#include <linux/selection.h>
38
39char vt_dont_switch;
40extern struct tty_driver *console_driver;
41
42#define VT_IS_IN_USE(i) (console_driver->ttys[i] && console_driver->ttys[i]->count)
43#define VT_BUSY(i) (VT_IS_IN_USE(i) || i == fg_console || vc_cons[i].d == sel_cons)
44
45/*
46 * Console (vt and kd) routines, as defined by USL SVR4 manual, and by
47 * experimentation and study of X386 SYSV handling.
48 *
49 * One point of difference: SYSV vt's are /dev/vtX, which X >= 0, and
50 * /dev/console is a separate ttyp. Under Linux, /dev/tty0 is /dev/console,
51 * and the vc start at /dev/ttyX, X >= 1. We maintain that here, so we will
52 * always treat our set of vt as numbered 1..MAX_NR_CONSOLES (corresponding to
53 * ttys 0..MAX_NR_CONSOLES-1). Explicitly naming VT 0 is illegal, but using
54 * /dev/tty0 (fg_console) as a target is legal, since an implicit aliasing
55 * to the current console is done by the main ioctl code.
56 */
57
58#ifdef CONFIG_X86
59#include <linux/syscalls.h>
60#endif
61
62static void complete_change_console(struct vc_data *vc);
63
64/*
65 * User space VT_EVENT handlers
66 */
67
68struct vt_event_wait {
69 struct list_head list;
70 struct vt_event event;
71 int done;
72};
73
74static LIST_HEAD(vt_events);
75static DEFINE_SPINLOCK(vt_event_lock);
76static DECLARE_WAIT_QUEUE_HEAD(vt_event_waitqueue);
77
78/**
79 * vt_event_post
80 * @event: the event that occurred
81 * @old: old console
82 * @new: new console
83 *
84 * Post an VT event to interested VT handlers
85 */
86
87void vt_event_post(unsigned int event, unsigned int old, unsigned int new)
88{
89 struct list_head *pos, *head;
90 unsigned long flags;
91 int wake = 0;
92
93 spin_lock_irqsave(&vt_event_lock, flags);
94 head = &vt_events;
95
96 list_for_each(pos, head) {
97 struct vt_event_wait *ve = list_entry(pos,
98 struct vt_event_wait, list);
99 if (!(ve->event.event & event))
100 continue;
101 ve->event.event = event;
102 /* kernel view is consoles 0..n-1, user space view is
103 console 1..n with 0 meaning current, so we must bias */
104 ve->event.oldev = old + 1;
105 ve->event.newev = new + 1;
106 wake = 1;
107 ve->done = 1;
108 }
109 spin_unlock_irqrestore(&vt_event_lock, flags);
110 if (wake)
111 wake_up_interruptible(&vt_event_waitqueue);
112}
113
114static void __vt_event_queue(struct vt_event_wait *vw)
115{
116 unsigned long flags;
117 /* Prepare the event */
118 INIT_LIST_HEAD(&vw->list);
119 vw->done = 0;
120 /* Queue our event */
121 spin_lock_irqsave(&vt_event_lock, flags);
122 list_add(&vw->list, &vt_events);
123 spin_unlock_irqrestore(&vt_event_lock, flags);
124}
125
126static void __vt_event_wait(struct vt_event_wait *vw)
127{
128 /* Wait for it to pass */
129 wait_event_interruptible(vt_event_waitqueue, vw->done);
130}
131
132static void __vt_event_dequeue(struct vt_event_wait *vw)
133{
134 unsigned long flags;
135
136 /* Dequeue it */
137 spin_lock_irqsave(&vt_event_lock, flags);
138 list_del(&vw->list);
139 spin_unlock_irqrestore(&vt_event_lock, flags);
140}
141
142/**
143 * vt_event_wait - wait for an event
144 * @vw: our event
145 *
146 * Waits for an event to occur which completes our vt_event_wait
147 * structure. On return the structure has wv->done set to 1 for success
148 * or 0 if some event such as a signal ended the wait.
149 */
150
151static void vt_event_wait(struct vt_event_wait *vw)
152{
153 __vt_event_queue(vw);
154 __vt_event_wait(vw);
155 __vt_event_dequeue(vw);
156}
157
158/**
159 * vt_event_wait_ioctl - event ioctl handler
160 * @arg: argument to ioctl
161 *
162 * Implement the VT_WAITEVENT ioctl using the VT event interface
163 */
164
165static int vt_event_wait_ioctl(struct vt_event __user *event)
166{
167 struct vt_event_wait vw;
168
169 if (copy_from_user(&vw.event, event, sizeof(struct vt_event)))
170 return -EFAULT;
171 /* Highest supported event for now */
172 if (vw.event.event & ~VT_MAX_EVENT)
173 return -EINVAL;
174
175 vt_event_wait(&vw);
176 /* If it occurred report it */
177 if (vw.done) {
178 if (copy_to_user(event, &vw.event, sizeof(struct vt_event)))
179 return -EFAULT;
180 return 0;
181 }
182 return -EINTR;
183}
184
185/**
186 * vt_waitactive - active console wait
187 * @event: event code
188 * @n: new console
189 *
190 * Helper for event waits. Used to implement the legacy
191 * event waiting ioctls in terms of events
192 */
193
194int vt_waitactive(int n)
195{
196 struct vt_event_wait vw;
197 do {
198 vw.event.event = VT_EVENT_SWITCH;
199 __vt_event_queue(&vw);
200 if (n == fg_console + 1) {
201 __vt_event_dequeue(&vw);
202 break;
203 }
204 __vt_event_wait(&vw);
205 __vt_event_dequeue(&vw);
206 if (vw.done == 0)
207 return -EINTR;
208 } while (vw.event.newev != n);
209 return 0;
210}
211
212/*
213 * these are the valid i/o ports we're allowed to change. they map all the
214 * video ports
215 */
216#define GPFIRST 0x3b4
217#define GPLAST 0x3df
218#define GPNUM (GPLAST - GPFIRST + 1)
219
220
221
222static inline int
223do_fontx_ioctl(int cmd, struct consolefontdesc __user *user_cfd, int perm, struct console_font_op *op)
224{
225 struct consolefontdesc cfdarg;
226 int i;
227
228 if (copy_from_user(&cfdarg, user_cfd, sizeof(struct consolefontdesc)))
229 return -EFAULT;
230
231 switch (cmd) {
232 case PIO_FONTX:
233 if (!perm)
234 return -EPERM;
235 op->op = KD_FONT_OP_SET;
236 op->flags = KD_FONT_FLAG_OLD;
237 op->width = 8;
238 op->height = cfdarg.charheight;
239 op->charcount = cfdarg.charcount;
240 op->data = cfdarg.chardata;
241 return con_font_op(vc_cons[fg_console].d, op);
242 case GIO_FONTX: {
243 op->op = KD_FONT_OP_GET;
244 op->flags = KD_FONT_FLAG_OLD;
245 op->width = 8;
246 op->height = cfdarg.charheight;
247 op->charcount = cfdarg.charcount;
248 op->data = cfdarg.chardata;
249 i = con_font_op(vc_cons[fg_console].d, op);
250 if (i)
251 return i;
252 cfdarg.charheight = op->height;
253 cfdarg.charcount = op->charcount;
254 if (copy_to_user(user_cfd, &cfdarg, sizeof(struct consolefontdesc)))
255 return -EFAULT;
256 return 0;
257 }
258 }
259 return -EINVAL;
260}
261
262static inline int
263do_unimap_ioctl(int cmd, struct unimapdesc __user *user_ud, int perm, struct vc_data *vc)
264{
265 struct unimapdesc tmp;
266
267 if (copy_from_user(&tmp, user_ud, sizeof tmp))
268 return -EFAULT;
269 if (tmp.entries)
270 if (!access_ok(VERIFY_WRITE, tmp.entries,
271 tmp.entry_ct*sizeof(struct unipair)))
272 return -EFAULT;
273 switch (cmd) {
274 case PIO_UNIMAP:
275 if (!perm)
276 return -EPERM;
277 return con_set_unimap(vc, tmp.entry_ct, tmp.entries);
278 case GIO_UNIMAP:
279 if (!perm && fg_console != vc->vc_num)
280 return -EPERM;
281 return con_get_unimap(vc, tmp.entry_ct, &(user_ud->entry_ct), tmp.entries);
282 }
283 return 0;
284}
285
286/* deallocate a single console, if possible (leave 0) */
287static int vt_disallocate(unsigned int vc_num)
288{
289 struct vc_data *vc = NULL;
290 int ret = 0;
291
292 console_lock();
293 if (VT_BUSY(vc_num))
294 ret = -EBUSY;
295 else if (vc_num)
296 vc = vc_deallocate(vc_num);
297 console_unlock();
298
299 if (vc && vc_num >= MIN_NR_CONSOLES) {
300 tty_port_destroy(&vc->port);
301 kfree(vc);
302 }
303
304 return ret;
305}
306
307/* deallocate all unused consoles, but leave 0 */
308static void vt_disallocate_all(void)
309{
310 struct vc_data *vc[MAX_NR_CONSOLES];
311 int i;
312
313 console_lock();
314 for (i = 1; i < MAX_NR_CONSOLES; i++)
315 if (!VT_BUSY(i))
316 vc[i] = vc_deallocate(i);
317 else
318 vc[i] = NULL;
319 console_unlock();
320
321 for (i = 1; i < MAX_NR_CONSOLES; i++) {
322 if (vc[i] && i >= MIN_NR_CONSOLES) {
323 tty_port_destroy(&vc[i]->port);
324 kfree(vc[i]);
325 }
326 }
327}
328
329
330/*
331 * We handle the console-specific ioctl's here. We allow the
332 * capability to modify any console, not just the fg_console.
333 */
334int vt_ioctl(struct tty_struct *tty,
335 unsigned int cmd, unsigned long arg)
336{
337 struct vc_data *vc = tty->driver_data;
338 struct console_font_op op; /* used in multiple places here */
339 unsigned int console;
340 unsigned char ucval;
341 unsigned int uival;
342 void __user *up = (void __user *)arg;
343 int i, perm;
344 int ret = 0;
345
346 console = vc->vc_num;
347
348
349 if (!vc_cons_allocated(console)) { /* impossible? */
350 ret = -ENOIOCTLCMD;
351 goto out;
352 }
353
354
355 /*
356 * To have permissions to do most of the vt ioctls, we either have
357 * to be the owner of the tty, or have CAP_SYS_TTY_CONFIG.
358 */
359 perm = 0;
360 if (current->signal->tty == tty || capable(CAP_SYS_TTY_CONFIG))
361 perm = 1;
362
363 switch (cmd) {
364 case TIOCLINUX:
365 ret = tioclinux(tty, arg);
366 break;
367 case KIOCSOUND:
368 if (!perm)
369 return -EPERM;
370 /*
371 * The use of PIT_TICK_RATE is historic, it used to be
372 * the platform-dependent CLOCK_TICK_RATE between 2.6.12
373 * and 2.6.36, which was a minor but unfortunate ABI
374 * change. kd_mksound is locked by the input layer.
375 */
376 if (arg)
377 arg = PIT_TICK_RATE / arg;
378 kd_mksound(arg, 0);
379 break;
380
381 case KDMKTONE:
382 if (!perm)
383 return -EPERM;
384 {
385 unsigned int ticks, count;
386
387 /*
388 * Generate the tone for the appropriate number of ticks.
389 * If the time is zero, turn off sound ourselves.
390 */
391 ticks = msecs_to_jiffies((arg >> 16) & 0xffff);
392 count = ticks ? (arg & 0xffff) : 0;
393 if (count)
394 count = PIT_TICK_RATE / count;
395 kd_mksound(count, ticks);
396 break;
397 }
398
399 case KDGKBTYPE:
400 /*
401 * this is naïve.
402 */
403 ucval = KB_101;
404 ret = put_user(ucval, (char __user *)arg);
405 break;
406
407 /*
408 * These cannot be implemented on any machine that implements
409 * ioperm() in user level (such as Alpha PCs) or not at all.
410 *
411 * XXX: you should never use these, just call ioperm directly..
412 */
413#ifdef CONFIG_X86
414 case KDADDIO:
415 case KDDELIO:
416 /*
417 * KDADDIO and KDDELIO may be able to add ports beyond what
418 * we reject here, but to be safe...
419 *
420 * These are locked internally via sys_ioperm
421 */
422 if (arg < GPFIRST || arg > GPLAST) {
423 ret = -EINVAL;
424 break;
425 }
426 ret = sys_ioperm(arg, 1, (cmd == KDADDIO)) ? -ENXIO : 0;
427 break;
428
429 case KDENABIO:
430 case KDDISABIO:
431 ret = sys_ioperm(GPFIRST, GPNUM,
432 (cmd == KDENABIO)) ? -ENXIO : 0;
433 break;
434#endif
435
436 /* Linux m68k/i386 interface for setting the keyboard delay/repeat rate */
437
438 case KDKBDREP:
439 {
440 struct kbd_repeat kbrep;
441
442 if (!capable(CAP_SYS_TTY_CONFIG))
443 return -EPERM;
444
445 if (copy_from_user(&kbrep, up, sizeof(struct kbd_repeat))) {
446 ret = -EFAULT;
447 break;
448 }
449 ret = kbd_rate(&kbrep);
450 if (ret)
451 break;
452 if (copy_to_user(up, &kbrep, sizeof(struct kbd_repeat)))
453 ret = -EFAULT;
454 break;
455 }
456
457 case KDSETMODE:
458 /*
459 * currently, setting the mode from KD_TEXT to KD_GRAPHICS
460 * doesn't do a whole lot. i'm not sure if it should do any
461 * restoration of modes or what...
462 *
463 * XXX It should at least call into the driver, fbdev's definitely
464 * need to restore their engine state. --BenH
465 */
466 if (!perm)
467 return -EPERM;
468 switch (arg) {
469 case KD_GRAPHICS:
470 break;
471 case KD_TEXT0:
472 case KD_TEXT1:
473 arg = KD_TEXT;
474 case KD_TEXT:
475 break;
476 default:
477 ret = -EINVAL;
478 goto out;
479 }
480 /* FIXME: this needs the console lock extending */
481 if (vc->vc_mode == (unsigned char) arg)
482 break;
483 vc->vc_mode = (unsigned char) arg;
484 if (console != fg_console)
485 break;
486 /*
487 * explicitly blank/unblank the screen if switching modes
488 */
489 console_lock();
490 if (arg == KD_TEXT)
491 do_unblank_screen(1);
492 else
493 do_blank_screen(1);
494 console_unlock();
495 break;
496
497 case KDGETMODE:
498 uival = vc->vc_mode;
499 goto setint;
500
501 case KDMAPDISP:
502 case KDUNMAPDISP:
503 /*
504 * these work like a combination of mmap and KDENABIO.
505 * this could be easily finished.
506 */
507 ret = -EINVAL;
508 break;
509
510 case KDSKBMODE:
511 if (!perm)
512 return -EPERM;
513 ret = vt_do_kdskbmode(console, arg);
514 if (ret == 0)
515 tty_ldisc_flush(tty);
516 break;
517
518 case KDGKBMODE:
519 uival = vt_do_kdgkbmode(console);
520 ret = put_user(uival, (int __user *)arg);
521 break;
522
523 /* this could be folded into KDSKBMODE, but for compatibility
524 reasons it is not so easy to fold KDGKBMETA into KDGKBMODE */
525 case KDSKBMETA:
526 ret = vt_do_kdskbmeta(console, arg);
527 break;
528
529 case KDGKBMETA:
530 /* FIXME: should review whether this is worth locking */
531 uival = vt_do_kdgkbmeta(console);
532 setint:
533 ret = put_user(uival, (int __user *)arg);
534 break;
535
536 case KDGETKEYCODE:
537 case KDSETKEYCODE:
538 if(!capable(CAP_SYS_TTY_CONFIG))
539 perm = 0;
540 ret = vt_do_kbkeycode_ioctl(cmd, up, perm);
541 break;
542
543 case KDGKBENT:
544 case KDSKBENT:
545 ret = vt_do_kdsk_ioctl(cmd, up, perm, console);
546 break;
547
548 case KDGKBSENT:
549 case KDSKBSENT:
550 ret = vt_do_kdgkb_ioctl(cmd, up, perm);
551 break;
552
553 /* Diacritical processing. Handled in keyboard.c as it has
554 to operate on the keyboard locks and structures */
555 case KDGKBDIACR:
556 case KDGKBDIACRUC:
557 case KDSKBDIACR:
558 case KDSKBDIACRUC:
559 ret = vt_do_diacrit(cmd, up, perm);
560 break;
561
562 /* the ioctls below read/set the flags usually shown in the leds */
563 /* don't use them - they will go away without warning */
564 case KDGKBLED:
565 case KDSKBLED:
566 case KDGETLED:
567 case KDSETLED:
568 ret = vt_do_kdskled(console, cmd, arg, perm);
569 break;
570
571 /*
572 * A process can indicate its willingness to accept signals
573 * generated by pressing an appropriate key combination.
574 * Thus, one can have a daemon that e.g. spawns a new console
575 * upon a keypress and then changes to it.
576 * See also the kbrequest field of inittab(5).
577 */
578 case KDSIGACCEPT:
579 {
580 if (!perm || !capable(CAP_KILL))
581 return -EPERM;
582 if (!valid_signal(arg) || arg < 1 || arg == SIGKILL)
583 ret = -EINVAL;
584 else {
585 spin_lock_irq(&vt_spawn_con.lock);
586 put_pid(vt_spawn_con.pid);
587 vt_spawn_con.pid = get_pid(task_pid(current));
588 vt_spawn_con.sig = arg;
589 spin_unlock_irq(&vt_spawn_con.lock);
590 }
591 break;
592 }
593
594 case VT_SETMODE:
595 {
596 struct vt_mode tmp;
597
598 if (!perm)
599 return -EPERM;
600 if (copy_from_user(&tmp, up, sizeof(struct vt_mode))) {
601 ret = -EFAULT;
602 goto out;
603 }
604 if (tmp.mode != VT_AUTO && tmp.mode != VT_PROCESS) {
605 ret = -EINVAL;
606 goto out;
607 }
608 console_lock();
609 vc->vt_mode = tmp;
610 /* the frsig is ignored, so we set it to 0 */
611 vc->vt_mode.frsig = 0;
612 put_pid(vc->vt_pid);
613 vc->vt_pid = get_pid(task_pid(current));
614 /* no switch is required -- saw@shade.msu.ru */
615 vc->vt_newvt = -1;
616 console_unlock();
617 break;
618 }
619
620 case VT_GETMODE:
621 {
622 struct vt_mode tmp;
623 int rc;
624
625 console_lock();
626 memcpy(&tmp, &vc->vt_mode, sizeof(struct vt_mode));
627 console_unlock();
628
629 rc = copy_to_user(up, &tmp, sizeof(struct vt_mode));
630 if (rc)
631 ret = -EFAULT;
632 break;
633 }
634
635 /*
636 * Returns global vt state. Note that VT 0 is always open, since
637 * it's an alias for the current VT, and people can't use it here.
638 * We cannot return state for more than 16 VTs, since v_state is short.
639 */
640 case VT_GETSTATE:
641 {
642 struct vt_stat __user *vtstat = up;
643 unsigned short state, mask;
644
645 /* Review: FIXME: Console lock ? */
646 if (put_user(fg_console + 1, &vtstat->v_active))
647 ret = -EFAULT;
648 else {
649 state = 1; /* /dev/tty0 is always open */
650 for (i = 0, mask = 2; i < MAX_NR_CONSOLES && mask;
651 ++i, mask <<= 1)
652 if (VT_IS_IN_USE(i))
653 state |= mask;
654 ret = put_user(state, &vtstat->v_state);
655 }
656 break;
657 }
658
659 /*
660 * Returns the first available (non-opened) console.
661 */
662 case VT_OPENQRY:
663 /* FIXME: locking ? - but then this is a stupid API */
664 for (i = 0; i < MAX_NR_CONSOLES; ++i)
665 if (! VT_IS_IN_USE(i))
666 break;
667 uival = i < MAX_NR_CONSOLES ? (i+1) : -1;
668 goto setint;
669
670 /*
671 * ioctl(fd, VT_ACTIVATE, num) will cause us to switch to vt # num,
672 * with num >= 1 (switches to vt 0, our console, are not allowed, just
673 * to preserve sanity).
674 */
675 case VT_ACTIVATE:
676 if (!perm)
677 return -EPERM;
678 if (arg == 0 || arg > MAX_NR_CONSOLES)
679 ret = -ENXIO;
680 else {
681 arg--;
682 console_lock();
683 ret = vc_allocate(arg);
684 console_unlock();
685 if (ret)
686 break;
687 set_console(arg);
688 }
689 break;
690
691 case VT_SETACTIVATE:
692 {
693 struct vt_setactivate vsa;
694
695 if (!perm)
696 return -EPERM;
697
698 if (copy_from_user(&vsa, (struct vt_setactivate __user *)arg,
699 sizeof(struct vt_setactivate))) {
700 ret = -EFAULT;
701 goto out;
702 }
703 if (vsa.console == 0 || vsa.console > MAX_NR_CONSOLES)
704 ret = -ENXIO;
705 else {
706 vsa.console--;
707 console_lock();
708 ret = vc_allocate(vsa.console);
709 if (ret == 0) {
710 struct vc_data *nvc;
711 /* This is safe providing we don't drop the
712 console sem between vc_allocate and
713 finishing referencing nvc */
714 nvc = vc_cons[vsa.console].d;
715 nvc->vt_mode = vsa.mode;
716 nvc->vt_mode.frsig = 0;
717 put_pid(nvc->vt_pid);
718 nvc->vt_pid = get_pid(task_pid(current));
719 }
720 console_unlock();
721 if (ret)
722 break;
723 /* Commence switch and lock */
724 /* Review set_console locks */
725 set_console(vsa.console);
726 }
727 break;
728 }
729
730 /*
731 * wait until the specified VT has been activated
732 */
733 case VT_WAITACTIVE:
734 if (!perm)
735 return -EPERM;
736 if (arg == 0 || arg > MAX_NR_CONSOLES)
737 ret = -ENXIO;
738 else
739 ret = vt_waitactive(arg);
740 break;
741
742 /*
743 * If a vt is under process control, the kernel will not switch to it
744 * immediately, but postpone the operation until the process calls this
745 * ioctl, allowing the switch to complete.
746 *
747 * According to the X sources this is the behavior:
748 * 0: pending switch-from not OK
749 * 1: pending switch-from OK
750 * 2: completed switch-to OK
751 */
752 case VT_RELDISP:
753 if (!perm)
754 return -EPERM;
755
756 console_lock();
757 if (vc->vt_mode.mode != VT_PROCESS) {
758 console_unlock();
759 ret = -EINVAL;
760 break;
761 }
762 /*
763 * Switching-from response
764 */
765 if (vc->vt_newvt >= 0) {
766 if (arg == 0)
767 /*
768 * Switch disallowed, so forget we were trying
769 * to do it.
770 */
771 vc->vt_newvt = -1;
772
773 else {
774 /*
775 * The current vt has been released, so
776 * complete the switch.
777 */
778 int newvt;
779 newvt = vc->vt_newvt;
780 vc->vt_newvt = -1;
781 ret = vc_allocate(newvt);
782 if (ret) {
783 console_unlock();
784 break;
785 }
786 /*
787 * When we actually do the console switch,
788 * make sure we are atomic with respect to
789 * other console switches..
790 */
791 complete_change_console(vc_cons[newvt].d);
792 }
793 } else {
794 /*
795 * Switched-to response
796 */
797 /*
798 * If it's just an ACK, ignore it
799 */
800 if (arg != VT_ACKACQ)
801 ret = -EINVAL;
802 }
803 console_unlock();
804 break;
805
806 /*
807 * Disallocate memory associated to VT (but leave VT1)
808 */
809 case VT_DISALLOCATE:
810 if (arg > MAX_NR_CONSOLES) {
811 ret = -ENXIO;
812 break;
813 }
814 if (arg == 0)
815 vt_disallocate_all();
816 else
817 ret = vt_disallocate(--arg);
818 break;
819
820 case VT_RESIZE:
821 {
822 struct vt_sizes __user *vtsizes = up;
823 struct vc_data *vc;
824
825 ushort ll,cc;
826 if (!perm)
827 return -EPERM;
828 if (get_user(ll, &vtsizes->v_rows) ||
829 get_user(cc, &vtsizes->v_cols))
830 ret = -EFAULT;
831 else {
832 console_lock();
833 for (i = 0; i < MAX_NR_CONSOLES; i++) {
834 vc = vc_cons[i].d;
835
836 if (vc) {
837 vc->vc_resize_user = 1;
838 /* FIXME: review v tty lock */
839 vc_resize(vc_cons[i].d, cc, ll);
840 }
841 }
842 console_unlock();
843 }
844 break;
845 }
846
847 case VT_RESIZEX:
848 {
849 struct vt_consize __user *vtconsize = up;
850 ushort ll,cc,vlin,clin,vcol,ccol;
851 if (!perm)
852 return -EPERM;
853 if (!access_ok(VERIFY_READ, vtconsize,
854 sizeof(struct vt_consize))) {
855 ret = -EFAULT;
856 break;
857 }
858 /* FIXME: Should check the copies properly */
859 __get_user(ll, &vtconsize->v_rows);
860 __get_user(cc, &vtconsize->v_cols);
861 __get_user(vlin, &vtconsize->v_vlin);
862 __get_user(clin, &vtconsize->v_clin);
863 __get_user(vcol, &vtconsize->v_vcol);
864 __get_user(ccol, &vtconsize->v_ccol);
865 vlin = vlin ? vlin : vc->vc_scan_lines;
866 if (clin) {
867 if (ll) {
868 if (ll != vlin/clin) {
869 /* Parameters don't add up */
870 ret = -EINVAL;
871 break;
872 }
873 } else
874 ll = vlin/clin;
875 }
876 if (vcol && ccol) {
877 if (cc) {
878 if (cc != vcol/ccol) {
879 ret = -EINVAL;
880 break;
881 }
882 } else
883 cc = vcol/ccol;
884 }
885
886 if (clin > 32) {
887 ret = -EINVAL;
888 break;
889 }
890
891 for (i = 0; i < MAX_NR_CONSOLES; i++) {
892 if (!vc_cons[i].d)
893 continue;
894 console_lock();
895 if (vlin)
896 vc_cons[i].d->vc_scan_lines = vlin;
897 if (clin)
898 vc_cons[i].d->vc_font.height = clin;
899 vc_cons[i].d->vc_resize_user = 1;
900 vc_resize(vc_cons[i].d, cc, ll);
901 console_unlock();
902 }
903 break;
904 }
905
906 case PIO_FONT: {
907 if (!perm)
908 return -EPERM;
909 op.op = KD_FONT_OP_SET;
910 op.flags = KD_FONT_FLAG_OLD | KD_FONT_FLAG_DONT_RECALC; /* Compatibility */
911 op.width = 8;
912 op.height = 0;
913 op.charcount = 256;
914 op.data = up;
915 ret = con_font_op(vc_cons[fg_console].d, &op);
916 break;
917 }
918
919 case GIO_FONT: {
920 op.op = KD_FONT_OP_GET;
921 op.flags = KD_FONT_FLAG_OLD;
922 op.width = 8;
923 op.height = 32;
924 op.charcount = 256;
925 op.data = up;
926 ret = con_font_op(vc_cons[fg_console].d, &op);
927 break;
928 }
929
930 case PIO_CMAP:
931 if (!perm)
932 ret = -EPERM;
933 else
934 ret = con_set_cmap(up);
935 break;
936
937 case GIO_CMAP:
938 ret = con_get_cmap(up);
939 break;
940
941 case PIO_FONTX:
942 case GIO_FONTX:
943 ret = do_fontx_ioctl(cmd, up, perm, &op);
944 break;
945
946 case PIO_FONTRESET:
947 {
948 if (!perm)
949 return -EPERM;
950
951#ifdef BROKEN_GRAPHICS_PROGRAMS
952 /* With BROKEN_GRAPHICS_PROGRAMS defined, the default
953 font is not saved. */
954 ret = -ENOSYS;
955 break;
956#else
957 {
958 op.op = KD_FONT_OP_SET_DEFAULT;
959 op.data = NULL;
960 ret = con_font_op(vc_cons[fg_console].d, &op);
961 if (ret)
962 break;
963 console_lock();
964 con_set_default_unimap(vc_cons[fg_console].d);
965 console_unlock();
966 break;
967 }
968#endif
969 }
970
971 case KDFONTOP: {
972 if (copy_from_user(&op, up, sizeof(op))) {
973 ret = -EFAULT;
974 break;
975 }
976 if (!perm && op.op != KD_FONT_OP_GET)
977 return -EPERM;
978 ret = con_font_op(vc, &op);
979 if (ret)
980 break;
981 if (copy_to_user(up, &op, sizeof(op)))
982 ret = -EFAULT;
983 break;
984 }
985
986 case PIO_SCRNMAP:
987 if (!perm)
988 ret = -EPERM;
989 else
990 ret = con_set_trans_old(up);
991 break;
992
993 case GIO_SCRNMAP:
994 ret = con_get_trans_old(up);
995 break;
996
997 case PIO_UNISCRNMAP:
998 if (!perm)
999 ret = -EPERM;
1000 else
1001 ret = con_set_trans_new(up);
1002 break;
1003
1004 case GIO_UNISCRNMAP:
1005 ret = con_get_trans_new(up);
1006 break;
1007
1008 case PIO_UNIMAPCLR:
1009 if (!perm)
1010 return -EPERM;
1011 con_clear_unimap(vc);
1012 break;
1013
1014 case PIO_UNIMAP:
1015 case GIO_UNIMAP:
1016 ret = do_unimap_ioctl(cmd, up, perm, vc);
1017 break;
1018
1019 case VT_LOCKSWITCH:
1020 if (!capable(CAP_SYS_TTY_CONFIG))
1021 return -EPERM;
1022 vt_dont_switch = 1;
1023 break;
1024 case VT_UNLOCKSWITCH:
1025 if (!capable(CAP_SYS_TTY_CONFIG))
1026 return -EPERM;
1027 vt_dont_switch = 0;
1028 break;
1029 case VT_GETHIFONTMASK:
1030 ret = put_user(vc->vc_hi_font_mask,
1031 (unsigned short __user *)arg);
1032 break;
1033 case VT_WAITEVENT:
1034 ret = vt_event_wait_ioctl((struct vt_event __user *)arg);
1035 break;
1036 default:
1037 ret = -ENOIOCTLCMD;
1038 }
1039out:
1040 return ret;
1041}
1042
1043void reset_vc(struct vc_data *vc)
1044{
1045 vc->vc_mode = KD_TEXT;
1046 vt_reset_unicode(vc->vc_num);
1047 vc->vt_mode.mode = VT_AUTO;
1048 vc->vt_mode.waitv = 0;
1049 vc->vt_mode.relsig = 0;
1050 vc->vt_mode.acqsig = 0;
1051 vc->vt_mode.frsig = 0;
1052 put_pid(vc->vt_pid);
1053 vc->vt_pid = NULL;
1054 vc->vt_newvt = -1;
1055 if (!in_interrupt()) /* Via keyboard.c:SAK() - akpm */
1056 reset_palette(vc);
1057}
1058
1059void vc_SAK(struct work_struct *work)
1060{
1061 struct vc *vc_con =
1062 container_of(work, struct vc, SAK_work);
1063 struct vc_data *vc;
1064 struct tty_struct *tty;
1065
1066 console_lock();
1067 vc = vc_con->d;
1068 if (vc) {
1069 /* FIXME: review tty ref counting */
1070 tty = vc->port.tty;
1071 /*
1072 * SAK should also work in all raw modes and reset
1073 * them properly.
1074 */
1075 if (tty)
1076 __do_SAK(tty);
1077 reset_vc(vc);
1078 }
1079 console_unlock();
1080}
1081
1082#ifdef CONFIG_COMPAT
1083
1084struct compat_consolefontdesc {
1085 unsigned short charcount; /* characters in font (256 or 512) */
1086 unsigned short charheight; /* scan lines per character (1-32) */
1087 compat_caddr_t chardata; /* font data in expanded form */
1088};
1089
1090static inline int
1091compat_fontx_ioctl(int cmd, struct compat_consolefontdesc __user *user_cfd,
1092 int perm, struct console_font_op *op)
1093{
1094 struct compat_consolefontdesc cfdarg;
1095 int i;
1096
1097 if (copy_from_user(&cfdarg, user_cfd, sizeof(struct compat_consolefontdesc)))
1098 return -EFAULT;
1099
1100 switch (cmd) {
1101 case PIO_FONTX:
1102 if (!perm)
1103 return -EPERM;
1104 op->op = KD_FONT_OP_SET;
1105 op->flags = KD_FONT_FLAG_OLD;
1106 op->width = 8;
1107 op->height = cfdarg.charheight;
1108 op->charcount = cfdarg.charcount;
1109 op->data = compat_ptr(cfdarg.chardata);
1110 return con_font_op(vc_cons[fg_console].d, op);
1111 case GIO_FONTX:
1112 op->op = KD_FONT_OP_GET;
1113 op->flags = KD_FONT_FLAG_OLD;
1114 op->width = 8;
1115 op->height = cfdarg.charheight;
1116 op->charcount = cfdarg.charcount;
1117 op->data = compat_ptr(cfdarg.chardata);
1118 i = con_font_op(vc_cons[fg_console].d, op);
1119 if (i)
1120 return i;
1121 cfdarg.charheight = op->height;
1122 cfdarg.charcount = op->charcount;
1123 if (copy_to_user(user_cfd, &cfdarg, sizeof(struct compat_consolefontdesc)))
1124 return -EFAULT;
1125 return 0;
1126 }
1127 return -EINVAL;
1128}
1129
1130struct compat_console_font_op {
1131 compat_uint_t op; /* operation code KD_FONT_OP_* */
1132 compat_uint_t flags; /* KD_FONT_FLAG_* */
1133 compat_uint_t width, height; /* font size */
1134 compat_uint_t charcount;
1135 compat_caddr_t data; /* font data with height fixed to 32 */
1136};
1137
1138static inline int
1139compat_kdfontop_ioctl(struct compat_console_font_op __user *fontop,
1140 int perm, struct console_font_op *op, struct vc_data *vc)
1141{
1142 int i;
1143
1144 if (copy_from_user(op, fontop, sizeof(struct compat_console_font_op)))
1145 return -EFAULT;
1146 if (!perm && op->op != KD_FONT_OP_GET)
1147 return -EPERM;
1148 op->data = compat_ptr(((struct compat_console_font_op *)op)->data);
1149 i = con_font_op(vc, op);
1150 if (i)
1151 return i;
1152 ((struct compat_console_font_op *)op)->data = (unsigned long)op->data;
1153 if (copy_to_user(fontop, op, sizeof(struct compat_console_font_op)))
1154 return -EFAULT;
1155 return 0;
1156}
1157
1158struct compat_unimapdesc {
1159 unsigned short entry_ct;
1160 compat_caddr_t entries;
1161};
1162
1163static inline int
1164compat_unimap_ioctl(unsigned int cmd, struct compat_unimapdesc __user *user_ud,
1165 int perm, struct vc_data *vc)
1166{
1167 struct compat_unimapdesc tmp;
1168 struct unipair __user *tmp_entries;
1169
1170 if (copy_from_user(&tmp, user_ud, sizeof tmp))
1171 return -EFAULT;
1172 tmp_entries = compat_ptr(tmp.entries);
1173 if (tmp_entries)
1174 if (!access_ok(VERIFY_WRITE, tmp_entries,
1175 tmp.entry_ct*sizeof(struct unipair)))
1176 return -EFAULT;
1177 switch (cmd) {
1178 case PIO_UNIMAP:
1179 if (!perm)
1180 return -EPERM;
1181 return con_set_unimap(vc, tmp.entry_ct, tmp_entries);
1182 case GIO_UNIMAP:
1183 if (!perm && fg_console != vc->vc_num)
1184 return -EPERM;
1185 return con_get_unimap(vc, tmp.entry_ct, &(user_ud->entry_ct), tmp_entries);
1186 }
1187 return 0;
1188}
1189
1190long vt_compat_ioctl(struct tty_struct *tty,
1191 unsigned int cmd, unsigned long arg)
1192{
1193 struct vc_data *vc = tty->driver_data;
1194 struct console_font_op op; /* used in multiple places here */
1195 unsigned int console;
1196 void __user *up = (void __user *)arg;
1197 int perm;
1198 int ret = 0;
1199
1200 console = vc->vc_num;
1201
1202 if (!vc_cons_allocated(console)) { /* impossible? */
1203 ret = -ENOIOCTLCMD;
1204 goto out;
1205 }
1206
1207 /*
1208 * To have permissions to do most of the vt ioctls, we either have
1209 * to be the owner of the tty, or have CAP_SYS_TTY_CONFIG.
1210 */
1211 perm = 0;
1212 if (current->signal->tty == tty || capable(CAP_SYS_TTY_CONFIG))
1213 perm = 1;
1214
1215 switch (cmd) {
1216 /*
1217 * these need special handlers for incompatible data structures
1218 */
1219 case PIO_FONTX:
1220 case GIO_FONTX:
1221 ret = compat_fontx_ioctl(cmd, up, perm, &op);
1222 break;
1223
1224 case KDFONTOP:
1225 ret = compat_kdfontop_ioctl(up, perm, &op, vc);
1226 break;
1227
1228 case PIO_UNIMAP:
1229 case GIO_UNIMAP:
1230 ret = compat_unimap_ioctl(cmd, up, perm, vc);
1231 break;
1232
1233 /*
1234 * all these treat 'arg' as an integer
1235 */
1236 case KIOCSOUND:
1237 case KDMKTONE:
1238#ifdef CONFIG_X86
1239 case KDADDIO:
1240 case KDDELIO:
1241#endif
1242 case KDSETMODE:
1243 case KDMAPDISP:
1244 case KDUNMAPDISP:
1245 case KDSKBMODE:
1246 case KDSKBMETA:
1247 case KDSKBLED:
1248 case KDSETLED:
1249 case KDSIGACCEPT:
1250 case VT_ACTIVATE:
1251 case VT_WAITACTIVE:
1252 case VT_RELDISP:
1253 case VT_DISALLOCATE:
1254 case VT_RESIZE:
1255 case VT_RESIZEX:
1256 goto fallback;
1257
1258 /*
1259 * the rest has a compatible data structure behind arg,
1260 * but we have to convert it to a proper 64 bit pointer.
1261 */
1262 default:
1263 arg = (unsigned long)compat_ptr(arg);
1264 goto fallback;
1265 }
1266out:
1267 return ret;
1268
1269fallback:
1270 return vt_ioctl(tty, cmd, arg);
1271}
1272
1273
1274#endif /* CONFIG_COMPAT */
1275
1276
1277/*
1278 * Performs the back end of a vt switch. Called under the console
1279 * semaphore.
1280 */
1281static void complete_change_console(struct vc_data *vc)
1282{
1283 unsigned char old_vc_mode;
1284 int old = fg_console;
1285
1286 last_console = fg_console;
1287
1288 /*
1289 * If we're switching, we could be going from KD_GRAPHICS to
1290 * KD_TEXT mode or vice versa, which means we need to blank or
1291 * unblank the screen later.
1292 */
1293 old_vc_mode = vc_cons[fg_console].d->vc_mode;
1294 switch_screen(vc);
1295
1296 /*
1297 * This can't appear below a successful kill_pid(). If it did,
1298 * then the *blank_screen operation could occur while X, having
1299 * received acqsig, is waking up on another processor. This
1300 * condition can lead to overlapping accesses to the VGA range
1301 * and the framebuffer (causing system lockups).
1302 *
1303 * To account for this we duplicate this code below only if the
1304 * controlling process is gone and we've called reset_vc.
1305 */
1306 if (old_vc_mode != vc->vc_mode) {
1307 if (vc->vc_mode == KD_TEXT)
1308 do_unblank_screen(1);
1309 else
1310 do_blank_screen(1);
1311 }
1312
1313 /*
1314 * If this new console is under process control, send it a signal
1315 * telling it that it has acquired. Also check if it has died and
1316 * clean up (similar to logic employed in change_console())
1317 */
1318 if (vc->vt_mode.mode == VT_PROCESS) {
1319 /*
1320 * Send the signal as privileged - kill_pid() will
1321 * tell us if the process has gone or something else
1322 * is awry
1323 */
1324 if (kill_pid(vc->vt_pid, vc->vt_mode.acqsig, 1) != 0) {
1325 /*
1326 * The controlling process has died, so we revert back to
1327 * normal operation. In this case, we'll also change back
1328 * to KD_TEXT mode. I'm not sure if this is strictly correct
1329 * but it saves the agony when the X server dies and the screen
1330 * remains blanked due to KD_GRAPHICS! It would be nice to do
1331 * this outside of VT_PROCESS but there is no single process
1332 * to account for and tracking tty count may be undesirable.
1333 */
1334 reset_vc(vc);
1335
1336 if (old_vc_mode != vc->vc_mode) {
1337 if (vc->vc_mode == KD_TEXT)
1338 do_unblank_screen(1);
1339 else
1340 do_blank_screen(1);
1341 }
1342 }
1343 }
1344
1345 /*
1346 * Wake anyone waiting for their VT to activate
1347 */
1348 vt_event_post(VT_EVENT_SWITCH, old, vc->vc_num);
1349 return;
1350}
1351
1352/*
1353 * Performs the front-end of a vt switch
1354 */
1355void change_console(struct vc_data *new_vc)
1356{
1357 struct vc_data *vc;
1358
1359 if (!new_vc || new_vc->vc_num == fg_console || vt_dont_switch)
1360 return;
1361
1362 /*
1363 * If this vt is in process mode, then we need to handshake with
1364 * that process before switching. Essentially, we store where that
1365 * vt wants to switch to and wait for it to tell us when it's done
1366 * (via VT_RELDISP ioctl).
1367 *
1368 * We also check to see if the controlling process still exists.
1369 * If it doesn't, we reset this vt to auto mode and continue.
1370 * This is a cheap way to track process control. The worst thing
1371 * that can happen is: we send a signal to a process, it dies, and
1372 * the switch gets "lost" waiting for a response; hopefully, the
1373 * user will try again, we'll detect the process is gone (unless
1374 * the user waits just the right amount of time :-) and revert the
1375 * vt to auto control.
1376 */
1377 vc = vc_cons[fg_console].d;
1378 if (vc->vt_mode.mode == VT_PROCESS) {
1379 /*
1380 * Send the signal as privileged - kill_pid() will
1381 * tell us if the process has gone or something else
1382 * is awry.
1383 *
1384 * We need to set vt_newvt *before* sending the signal or we
1385 * have a race.
1386 */
1387 vc->vt_newvt = new_vc->vc_num;
1388 if (kill_pid(vc->vt_pid, vc->vt_mode.relsig, 1) == 0) {
1389 /*
1390 * It worked. Mark the vt to switch to and
1391 * return. The process needs to send us a
1392 * VT_RELDISP ioctl to complete the switch.
1393 */
1394 return;
1395 }
1396
1397 /*
1398 * The controlling process has died, so we revert back to
1399 * normal operation. In this case, we'll also change back
1400 * to KD_TEXT mode. I'm not sure if this is strictly correct
1401 * but it saves the agony when the X server dies and the screen
1402 * remains blanked due to KD_GRAPHICS! It would be nice to do
1403 * this outside of VT_PROCESS but there is no single process
1404 * to account for and tracking tty count may be undesirable.
1405 */
1406 reset_vc(vc);
1407
1408 /*
1409 * Fall through to normal (VT_AUTO) handling of the switch...
1410 */
1411 }
1412
1413 /*
1414 * Ignore all switches in KD_GRAPHICS+VT_AUTO mode
1415 */
1416 if (vc->vc_mode == KD_GRAPHICS)
1417 return;
1418
1419 complete_change_console(new_vc);
1420}
1421
1422/* Perform a kernel triggered VT switch for suspend/resume */
1423
1424static int disable_vt_switch;
1425
1426int vt_move_to_console(unsigned int vt, int alloc)
1427{
1428 int prev;
1429
1430 console_lock();
1431 /* Graphics mode - up to X */
1432 if (disable_vt_switch) {
1433 console_unlock();
1434 return 0;
1435 }
1436 prev = fg_console;
1437
1438 if (alloc && vc_allocate(vt)) {
1439 /* we can't have a free VC for now. Too bad,
1440 * we don't want to mess the screen for now. */
1441 console_unlock();
1442 return -ENOSPC;
1443 }
1444
1445 if (set_console(vt)) {
1446 /*
1447 * We're unable to switch to the SUSPEND_CONSOLE.
1448 * Let the calling function know so it can decide
1449 * what to do.
1450 */
1451 console_unlock();
1452 return -EIO;
1453 }
1454 console_unlock();
1455 if (vt_waitactive(vt + 1)) {
1456 pr_debug("Suspend: Can't switch VCs.");
1457 return -EINTR;
1458 }
1459 return prev;
1460}
1461
1462/*
1463 * Normally during a suspend, we allocate a new console and switch to it.
1464 * When we resume, we switch back to the original console. This switch
1465 * can be slow, so on systems where the framebuffer can handle restoration
1466 * of video registers anyways, there's little point in doing the console
1467 * switch. This function allows you to disable it by passing it '0'.
1468 */
1469void pm_set_vt_switch(int do_switch)
1470{
1471 console_lock();
1472 disable_vt_switch = !do_switch;
1473 console_unlock();
1474}
1475EXPORT_SYMBOL(pm_set_vt_switch);
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Copyright (C) 1992 obz under the linux copyright
4 *
5 * Dynamic diacritical handling - aeb@cwi.nl - Dec 1993
6 * Dynamic keymap and string allocation - aeb@cwi.nl - May 1994
7 * Restrict VT switching via ioctl() - grif@cs.ucr.edu - Dec 1995
8 * Some code moved for less code duplication - Andi Kleen - Mar 1997
9 * Check put/get_user, cleanups - acme@conectiva.com.br - Jun 2001
10 */
11
12#include <linux/types.h>
13#include <linux/errno.h>
14#include <linux/sched/signal.h>
15#include <linux/tty.h>
16#include <linux/timer.h>
17#include <linux/kernel.h>
18#include <linux/compat.h>
19#include <linux/module.h>
20#include <linux/kd.h>
21#include <linux/vt.h>
22#include <linux/string.h>
23#include <linux/slab.h>
24#include <linux/major.h>
25#include <linux/fs.h>
26#include <linux/console.h>
27#include <linux/consolemap.h>
28#include <linux/signal.h>
29#include <linux/suspend.h>
30#include <linux/timex.h>
31
32#include <asm/io.h>
33#include <linux/uaccess.h>
34
35#include <linux/kbd_kern.h>
36#include <linux/vt_kern.h>
37#include <linux/kbd_diacr.h>
38#include <linux/selection.h>
39
40char vt_dont_switch;
41extern struct tty_driver *console_driver;
42
43#define VT_IS_IN_USE(i) (console_driver->ttys[i] && console_driver->ttys[i]->count)
44#define VT_BUSY(i) (VT_IS_IN_USE(i) || i == fg_console || vc_cons[i].d == sel_cons)
45
46/*
47 * Console (vt and kd) routines, as defined by USL SVR4 manual, and by
48 * experimentation and study of X386 SYSV handling.
49 *
50 * One point of difference: SYSV vt's are /dev/vtX, which X >= 0, and
51 * /dev/console is a separate ttyp. Under Linux, /dev/tty0 is /dev/console,
52 * and the vc start at /dev/ttyX, X >= 1. We maintain that here, so we will
53 * always treat our set of vt as numbered 1..MAX_NR_CONSOLES (corresponding to
54 * ttys 0..MAX_NR_CONSOLES-1). Explicitly naming VT 0 is illegal, but using
55 * /dev/tty0 (fg_console) as a target is legal, since an implicit aliasing
56 * to the current console is done by the main ioctl code.
57 */
58
59#ifdef CONFIG_X86
60#include <asm/syscalls.h>
61#endif
62
63static void complete_change_console(struct vc_data *vc);
64
65/*
66 * User space VT_EVENT handlers
67 */
68
69struct vt_event_wait {
70 struct list_head list;
71 struct vt_event event;
72 int done;
73};
74
75static LIST_HEAD(vt_events);
76static DEFINE_SPINLOCK(vt_event_lock);
77static DECLARE_WAIT_QUEUE_HEAD(vt_event_waitqueue);
78
79/**
80 * vt_event_post
81 * @event: the event that occurred
82 * @old: old console
83 * @new: new console
84 *
85 * Post an VT event to interested VT handlers
86 */
87
88void vt_event_post(unsigned int event, unsigned int old, unsigned int new)
89{
90 struct list_head *pos, *head;
91 unsigned long flags;
92 int wake = 0;
93
94 spin_lock_irqsave(&vt_event_lock, flags);
95 head = &vt_events;
96
97 list_for_each(pos, head) {
98 struct vt_event_wait *ve = list_entry(pos,
99 struct vt_event_wait, list);
100 if (!(ve->event.event & event))
101 continue;
102 ve->event.event = event;
103 /* kernel view is consoles 0..n-1, user space view is
104 console 1..n with 0 meaning current, so we must bias */
105 ve->event.oldev = old + 1;
106 ve->event.newev = new + 1;
107 wake = 1;
108 ve->done = 1;
109 }
110 spin_unlock_irqrestore(&vt_event_lock, flags);
111 if (wake)
112 wake_up_interruptible(&vt_event_waitqueue);
113}
114
115static void __vt_event_queue(struct vt_event_wait *vw)
116{
117 unsigned long flags;
118 /* Prepare the event */
119 INIT_LIST_HEAD(&vw->list);
120 vw->done = 0;
121 /* Queue our event */
122 spin_lock_irqsave(&vt_event_lock, flags);
123 list_add(&vw->list, &vt_events);
124 spin_unlock_irqrestore(&vt_event_lock, flags);
125}
126
127static void __vt_event_wait(struct vt_event_wait *vw)
128{
129 /* Wait for it to pass */
130 wait_event_interruptible(vt_event_waitqueue, vw->done);
131}
132
133static void __vt_event_dequeue(struct vt_event_wait *vw)
134{
135 unsigned long flags;
136
137 /* Dequeue it */
138 spin_lock_irqsave(&vt_event_lock, flags);
139 list_del(&vw->list);
140 spin_unlock_irqrestore(&vt_event_lock, flags);
141}
142
143/**
144 * vt_event_wait - wait for an event
145 * @vw: our event
146 *
147 * Waits for an event to occur which completes our vt_event_wait
148 * structure. On return the structure has wv->done set to 1 for success
149 * or 0 if some event such as a signal ended the wait.
150 */
151
152static void vt_event_wait(struct vt_event_wait *vw)
153{
154 __vt_event_queue(vw);
155 __vt_event_wait(vw);
156 __vt_event_dequeue(vw);
157}
158
159/**
160 * vt_event_wait_ioctl - event ioctl handler
161 * @arg: argument to ioctl
162 *
163 * Implement the VT_WAITEVENT ioctl using the VT event interface
164 */
165
166static int vt_event_wait_ioctl(struct vt_event __user *event)
167{
168 struct vt_event_wait vw;
169
170 if (copy_from_user(&vw.event, event, sizeof(struct vt_event)))
171 return -EFAULT;
172 /* Highest supported event for now */
173 if (vw.event.event & ~VT_MAX_EVENT)
174 return -EINVAL;
175
176 vt_event_wait(&vw);
177 /* If it occurred report it */
178 if (vw.done) {
179 if (copy_to_user(event, &vw.event, sizeof(struct vt_event)))
180 return -EFAULT;
181 return 0;
182 }
183 return -EINTR;
184}
185
186/**
187 * vt_waitactive - active console wait
188 * @event: event code
189 * @n: new console
190 *
191 * Helper for event waits. Used to implement the legacy
192 * event waiting ioctls in terms of events
193 */
194
195int vt_waitactive(int n)
196{
197 struct vt_event_wait vw;
198 do {
199 vw.event.event = VT_EVENT_SWITCH;
200 __vt_event_queue(&vw);
201 if (n == fg_console + 1) {
202 __vt_event_dequeue(&vw);
203 break;
204 }
205 __vt_event_wait(&vw);
206 __vt_event_dequeue(&vw);
207 if (vw.done == 0)
208 return -EINTR;
209 } while (vw.event.newev != n);
210 return 0;
211}
212
213/*
214 * these are the valid i/o ports we're allowed to change. they map all the
215 * video ports
216 */
217#define GPFIRST 0x3b4
218#define GPLAST 0x3df
219#define GPNUM (GPLAST - GPFIRST + 1)
220
221
222
223static inline int
224do_fontx_ioctl(int cmd, struct consolefontdesc __user *user_cfd, int perm, struct console_font_op *op)
225{
226 struct consolefontdesc cfdarg;
227 int i;
228
229 if (copy_from_user(&cfdarg, user_cfd, sizeof(struct consolefontdesc)))
230 return -EFAULT;
231
232 switch (cmd) {
233 case PIO_FONTX:
234 if (!perm)
235 return -EPERM;
236 op->op = KD_FONT_OP_SET;
237 op->flags = KD_FONT_FLAG_OLD;
238 op->width = 8;
239 op->height = cfdarg.charheight;
240 op->charcount = cfdarg.charcount;
241 op->data = cfdarg.chardata;
242 return con_font_op(vc_cons[fg_console].d, op);
243 case GIO_FONTX: {
244 op->op = KD_FONT_OP_GET;
245 op->flags = KD_FONT_FLAG_OLD;
246 op->width = 8;
247 op->height = cfdarg.charheight;
248 op->charcount = cfdarg.charcount;
249 op->data = cfdarg.chardata;
250 i = con_font_op(vc_cons[fg_console].d, op);
251 if (i)
252 return i;
253 cfdarg.charheight = op->height;
254 cfdarg.charcount = op->charcount;
255 if (copy_to_user(user_cfd, &cfdarg, sizeof(struct consolefontdesc)))
256 return -EFAULT;
257 return 0;
258 }
259 }
260 return -EINVAL;
261}
262
263static inline int
264do_unimap_ioctl(int cmd, struct unimapdesc __user *user_ud, int perm, struct vc_data *vc)
265{
266 struct unimapdesc tmp;
267
268 if (copy_from_user(&tmp, user_ud, sizeof tmp))
269 return -EFAULT;
270 switch (cmd) {
271 case PIO_UNIMAP:
272 if (!perm)
273 return -EPERM;
274 return con_set_unimap(vc, tmp.entry_ct, tmp.entries);
275 case GIO_UNIMAP:
276 if (!perm && fg_console != vc->vc_num)
277 return -EPERM;
278 return con_get_unimap(vc, tmp.entry_ct, &(user_ud->entry_ct), tmp.entries);
279 }
280 return 0;
281}
282
283/* deallocate a single console, if possible (leave 0) */
284static int vt_disallocate(unsigned int vc_num)
285{
286 struct vc_data *vc = NULL;
287 int ret = 0;
288
289 console_lock();
290 if (VT_BUSY(vc_num))
291 ret = -EBUSY;
292 else if (vc_num)
293 vc = vc_deallocate(vc_num);
294 console_unlock();
295
296 if (vc && vc_num >= MIN_NR_CONSOLES) {
297 tty_port_destroy(&vc->port);
298 kfree(vc);
299 }
300
301 return ret;
302}
303
304/* deallocate all unused consoles, but leave 0 */
305static void vt_disallocate_all(void)
306{
307 struct vc_data *vc[MAX_NR_CONSOLES];
308 int i;
309
310 console_lock();
311 for (i = 1; i < MAX_NR_CONSOLES; i++)
312 if (!VT_BUSY(i))
313 vc[i] = vc_deallocate(i);
314 else
315 vc[i] = NULL;
316 console_unlock();
317
318 for (i = 1; i < MAX_NR_CONSOLES; i++) {
319 if (vc[i] && i >= MIN_NR_CONSOLES) {
320 tty_port_destroy(&vc[i]->port);
321 kfree(vc[i]);
322 }
323 }
324}
325
326
327/*
328 * We handle the console-specific ioctl's here. We allow the
329 * capability to modify any console, not just the fg_console.
330 */
331int vt_ioctl(struct tty_struct *tty,
332 unsigned int cmd, unsigned long arg)
333{
334 struct vc_data *vc = tty->driver_data;
335 struct console_font_op op; /* used in multiple places here */
336 unsigned int console;
337 unsigned char ucval;
338 unsigned int uival;
339 void __user *up = (void __user *)arg;
340 int i, perm;
341 int ret = 0;
342
343 console = vc->vc_num;
344
345
346 if (!vc_cons_allocated(console)) { /* impossible? */
347 ret = -ENOIOCTLCMD;
348 goto out;
349 }
350
351
352 /*
353 * To have permissions to do most of the vt ioctls, we either have
354 * to be the owner of the tty, or have CAP_SYS_TTY_CONFIG.
355 */
356 perm = 0;
357 if (current->signal->tty == tty || capable(CAP_SYS_TTY_CONFIG))
358 perm = 1;
359
360 switch (cmd) {
361 case TIOCLINUX:
362 ret = tioclinux(tty, arg);
363 break;
364 case KIOCSOUND:
365 if (!perm)
366 return -EPERM;
367 /*
368 * The use of PIT_TICK_RATE is historic, it used to be
369 * the platform-dependent CLOCK_TICK_RATE between 2.6.12
370 * and 2.6.36, which was a minor but unfortunate ABI
371 * change. kd_mksound is locked by the input layer.
372 */
373 if (arg)
374 arg = PIT_TICK_RATE / arg;
375 kd_mksound(arg, 0);
376 break;
377
378 case KDMKTONE:
379 if (!perm)
380 return -EPERM;
381 {
382 unsigned int ticks, count;
383
384 /*
385 * Generate the tone for the appropriate number of ticks.
386 * If the time is zero, turn off sound ourselves.
387 */
388 ticks = msecs_to_jiffies((arg >> 16) & 0xffff);
389 count = ticks ? (arg & 0xffff) : 0;
390 if (count)
391 count = PIT_TICK_RATE / count;
392 kd_mksound(count, ticks);
393 break;
394 }
395
396 case KDGKBTYPE:
397 /*
398 * this is naïve.
399 */
400 ucval = KB_101;
401 ret = put_user(ucval, (char __user *)arg);
402 break;
403
404 /*
405 * These cannot be implemented on any machine that implements
406 * ioperm() in user level (such as Alpha PCs) or not at all.
407 *
408 * XXX: you should never use these, just call ioperm directly..
409 */
410#ifdef CONFIG_X86
411 case KDADDIO:
412 case KDDELIO:
413 /*
414 * KDADDIO and KDDELIO may be able to add ports beyond what
415 * we reject here, but to be safe...
416 *
417 * These are locked internally via sys_ioperm
418 */
419 if (arg < GPFIRST || arg > GPLAST) {
420 ret = -EINVAL;
421 break;
422 }
423 ret = ksys_ioperm(arg, 1, (cmd == KDADDIO)) ? -ENXIO : 0;
424 break;
425
426 case KDENABIO:
427 case KDDISABIO:
428 ret = ksys_ioperm(GPFIRST, GPNUM,
429 (cmd == KDENABIO)) ? -ENXIO : 0;
430 break;
431#endif
432
433 /* Linux m68k/i386 interface for setting the keyboard delay/repeat rate */
434
435 case KDKBDREP:
436 {
437 struct kbd_repeat kbrep;
438
439 if (!capable(CAP_SYS_TTY_CONFIG))
440 return -EPERM;
441
442 if (copy_from_user(&kbrep, up, sizeof(struct kbd_repeat))) {
443 ret = -EFAULT;
444 break;
445 }
446 ret = kbd_rate(&kbrep);
447 if (ret)
448 break;
449 if (copy_to_user(up, &kbrep, sizeof(struct kbd_repeat)))
450 ret = -EFAULT;
451 break;
452 }
453
454 case KDSETMODE:
455 /*
456 * currently, setting the mode from KD_TEXT to KD_GRAPHICS
457 * doesn't do a whole lot. i'm not sure if it should do any
458 * restoration of modes or what...
459 *
460 * XXX It should at least call into the driver, fbdev's definitely
461 * need to restore their engine state. --BenH
462 */
463 if (!perm)
464 return -EPERM;
465 switch (arg) {
466 case KD_GRAPHICS:
467 break;
468 case KD_TEXT0:
469 case KD_TEXT1:
470 arg = KD_TEXT;
471 case KD_TEXT:
472 break;
473 default:
474 ret = -EINVAL;
475 goto out;
476 }
477 /* FIXME: this needs the console lock extending */
478 if (vc->vc_mode == (unsigned char) arg)
479 break;
480 vc->vc_mode = (unsigned char) arg;
481 if (console != fg_console)
482 break;
483 /*
484 * explicitly blank/unblank the screen if switching modes
485 */
486 console_lock();
487 if (arg == KD_TEXT)
488 do_unblank_screen(1);
489 else
490 do_blank_screen(1);
491 console_unlock();
492 break;
493
494 case KDGETMODE:
495 uival = vc->vc_mode;
496 goto setint;
497
498 case KDMAPDISP:
499 case KDUNMAPDISP:
500 /*
501 * these work like a combination of mmap and KDENABIO.
502 * this could be easily finished.
503 */
504 ret = -EINVAL;
505 break;
506
507 case KDSKBMODE:
508 if (!perm)
509 return -EPERM;
510 ret = vt_do_kdskbmode(console, arg);
511 if (ret == 0)
512 tty_ldisc_flush(tty);
513 break;
514
515 case KDGKBMODE:
516 uival = vt_do_kdgkbmode(console);
517 ret = put_user(uival, (int __user *)arg);
518 break;
519
520 /* this could be folded into KDSKBMODE, but for compatibility
521 reasons it is not so easy to fold KDGKBMETA into KDGKBMODE */
522 case KDSKBMETA:
523 ret = vt_do_kdskbmeta(console, arg);
524 break;
525
526 case KDGKBMETA:
527 /* FIXME: should review whether this is worth locking */
528 uival = vt_do_kdgkbmeta(console);
529 setint:
530 ret = put_user(uival, (int __user *)arg);
531 break;
532
533 case KDGETKEYCODE:
534 case KDSETKEYCODE:
535 if(!capable(CAP_SYS_TTY_CONFIG))
536 perm = 0;
537 ret = vt_do_kbkeycode_ioctl(cmd, up, perm);
538 break;
539
540 case KDGKBENT:
541 case KDSKBENT:
542 ret = vt_do_kdsk_ioctl(cmd, up, perm, console);
543 break;
544
545 case KDGKBSENT:
546 case KDSKBSENT:
547 ret = vt_do_kdgkb_ioctl(cmd, up, perm);
548 break;
549
550 /* Diacritical processing. Handled in keyboard.c as it has
551 to operate on the keyboard locks and structures */
552 case KDGKBDIACR:
553 case KDGKBDIACRUC:
554 case KDSKBDIACR:
555 case KDSKBDIACRUC:
556 ret = vt_do_diacrit(cmd, up, perm);
557 break;
558
559 /* the ioctls below read/set the flags usually shown in the leds */
560 /* don't use them - they will go away without warning */
561 case KDGKBLED:
562 case KDSKBLED:
563 case KDGETLED:
564 case KDSETLED:
565 ret = vt_do_kdskled(console, cmd, arg, perm);
566 break;
567
568 /*
569 * A process can indicate its willingness to accept signals
570 * generated by pressing an appropriate key combination.
571 * Thus, one can have a daemon that e.g. spawns a new console
572 * upon a keypress and then changes to it.
573 * See also the kbrequest field of inittab(5).
574 */
575 case KDSIGACCEPT:
576 {
577 if (!perm || !capable(CAP_KILL))
578 return -EPERM;
579 if (!valid_signal(arg) || arg < 1 || arg == SIGKILL)
580 ret = -EINVAL;
581 else {
582 spin_lock_irq(&vt_spawn_con.lock);
583 put_pid(vt_spawn_con.pid);
584 vt_spawn_con.pid = get_pid(task_pid(current));
585 vt_spawn_con.sig = arg;
586 spin_unlock_irq(&vt_spawn_con.lock);
587 }
588 break;
589 }
590
591 case VT_SETMODE:
592 {
593 struct vt_mode tmp;
594
595 if (!perm)
596 return -EPERM;
597 if (copy_from_user(&tmp, up, sizeof(struct vt_mode))) {
598 ret = -EFAULT;
599 goto out;
600 }
601 if (tmp.mode != VT_AUTO && tmp.mode != VT_PROCESS) {
602 ret = -EINVAL;
603 goto out;
604 }
605 console_lock();
606 vc->vt_mode = tmp;
607 /* the frsig is ignored, so we set it to 0 */
608 vc->vt_mode.frsig = 0;
609 put_pid(vc->vt_pid);
610 vc->vt_pid = get_pid(task_pid(current));
611 /* no switch is required -- saw@shade.msu.ru */
612 vc->vt_newvt = -1;
613 console_unlock();
614 break;
615 }
616
617 case VT_GETMODE:
618 {
619 struct vt_mode tmp;
620 int rc;
621
622 console_lock();
623 memcpy(&tmp, &vc->vt_mode, sizeof(struct vt_mode));
624 console_unlock();
625
626 rc = copy_to_user(up, &tmp, sizeof(struct vt_mode));
627 if (rc)
628 ret = -EFAULT;
629 break;
630 }
631
632 /*
633 * Returns global vt state. Note that VT 0 is always open, since
634 * it's an alias for the current VT, and people can't use it here.
635 * We cannot return state for more than 16 VTs, since v_state is short.
636 */
637 case VT_GETSTATE:
638 {
639 struct vt_stat __user *vtstat = up;
640 unsigned short state, mask;
641
642 /* Review: FIXME: Console lock ? */
643 if (put_user(fg_console + 1, &vtstat->v_active))
644 ret = -EFAULT;
645 else {
646 state = 1; /* /dev/tty0 is always open */
647 for (i = 0, mask = 2; i < MAX_NR_CONSOLES && mask;
648 ++i, mask <<= 1)
649 if (VT_IS_IN_USE(i))
650 state |= mask;
651 ret = put_user(state, &vtstat->v_state);
652 }
653 break;
654 }
655
656 /*
657 * Returns the first available (non-opened) console.
658 */
659 case VT_OPENQRY:
660 /* FIXME: locking ? - but then this is a stupid API */
661 for (i = 0; i < MAX_NR_CONSOLES; ++i)
662 if (! VT_IS_IN_USE(i))
663 break;
664 uival = i < MAX_NR_CONSOLES ? (i+1) : -1;
665 goto setint;
666
667 /*
668 * ioctl(fd, VT_ACTIVATE, num) will cause us to switch to vt # num,
669 * with num >= 1 (switches to vt 0, our console, are not allowed, just
670 * to preserve sanity).
671 */
672 case VT_ACTIVATE:
673 if (!perm)
674 return -EPERM;
675 if (arg == 0 || arg > MAX_NR_CONSOLES)
676 ret = -ENXIO;
677 else {
678 arg--;
679 console_lock();
680 ret = vc_allocate(arg);
681 console_unlock();
682 if (ret)
683 break;
684 set_console(arg);
685 }
686 break;
687
688 case VT_SETACTIVATE:
689 {
690 struct vt_setactivate vsa;
691
692 if (!perm)
693 return -EPERM;
694
695 if (copy_from_user(&vsa, (struct vt_setactivate __user *)arg,
696 sizeof(struct vt_setactivate))) {
697 ret = -EFAULT;
698 goto out;
699 }
700 if (vsa.console == 0 || vsa.console > MAX_NR_CONSOLES)
701 ret = -ENXIO;
702 else {
703 vsa.console--;
704 console_lock();
705 ret = vc_allocate(vsa.console);
706 if (ret == 0) {
707 struct vc_data *nvc;
708 /* This is safe providing we don't drop the
709 console sem between vc_allocate and
710 finishing referencing nvc */
711 nvc = vc_cons[vsa.console].d;
712 nvc->vt_mode = vsa.mode;
713 nvc->vt_mode.frsig = 0;
714 put_pid(nvc->vt_pid);
715 nvc->vt_pid = get_pid(task_pid(current));
716 }
717 console_unlock();
718 if (ret)
719 break;
720 /* Commence switch and lock */
721 /* Review set_console locks */
722 set_console(vsa.console);
723 }
724 break;
725 }
726
727 /*
728 * wait until the specified VT has been activated
729 */
730 case VT_WAITACTIVE:
731 if (!perm)
732 return -EPERM;
733 if (arg == 0 || arg > MAX_NR_CONSOLES)
734 ret = -ENXIO;
735 else
736 ret = vt_waitactive(arg);
737 break;
738
739 /*
740 * If a vt is under process control, the kernel will not switch to it
741 * immediately, but postpone the operation until the process calls this
742 * ioctl, allowing the switch to complete.
743 *
744 * According to the X sources this is the behavior:
745 * 0: pending switch-from not OK
746 * 1: pending switch-from OK
747 * 2: completed switch-to OK
748 */
749 case VT_RELDISP:
750 if (!perm)
751 return -EPERM;
752
753 console_lock();
754 if (vc->vt_mode.mode != VT_PROCESS) {
755 console_unlock();
756 ret = -EINVAL;
757 break;
758 }
759 /*
760 * Switching-from response
761 */
762 if (vc->vt_newvt >= 0) {
763 if (arg == 0)
764 /*
765 * Switch disallowed, so forget we were trying
766 * to do it.
767 */
768 vc->vt_newvt = -1;
769
770 else {
771 /*
772 * The current vt has been released, so
773 * complete the switch.
774 */
775 int newvt;
776 newvt = vc->vt_newvt;
777 vc->vt_newvt = -1;
778 ret = vc_allocate(newvt);
779 if (ret) {
780 console_unlock();
781 break;
782 }
783 /*
784 * When we actually do the console switch,
785 * make sure we are atomic with respect to
786 * other console switches..
787 */
788 complete_change_console(vc_cons[newvt].d);
789 }
790 } else {
791 /*
792 * Switched-to response
793 */
794 /*
795 * If it's just an ACK, ignore it
796 */
797 if (arg != VT_ACKACQ)
798 ret = -EINVAL;
799 }
800 console_unlock();
801 break;
802
803 /*
804 * Disallocate memory associated to VT (but leave VT1)
805 */
806 case VT_DISALLOCATE:
807 if (arg > MAX_NR_CONSOLES) {
808 ret = -ENXIO;
809 break;
810 }
811 if (arg == 0)
812 vt_disallocate_all();
813 else
814 ret = vt_disallocate(--arg);
815 break;
816
817 case VT_RESIZE:
818 {
819 struct vt_sizes __user *vtsizes = up;
820 struct vc_data *vc;
821
822 ushort ll,cc;
823 if (!perm)
824 return -EPERM;
825 if (get_user(ll, &vtsizes->v_rows) ||
826 get_user(cc, &vtsizes->v_cols))
827 ret = -EFAULT;
828 else {
829 console_lock();
830 for (i = 0; i < MAX_NR_CONSOLES; i++) {
831 vc = vc_cons[i].d;
832
833 if (vc) {
834 vc->vc_resize_user = 1;
835 /* FIXME: review v tty lock */
836 vc_resize(vc_cons[i].d, cc, ll);
837 }
838 }
839 console_unlock();
840 }
841 break;
842 }
843
844 case VT_RESIZEX:
845 {
846 struct vt_consize v;
847 if (!perm)
848 return -EPERM;
849 if (copy_from_user(&v, up, sizeof(struct vt_consize)))
850 return -EFAULT;
851 /* FIXME: Should check the copies properly */
852 if (!v.v_vlin)
853 v.v_vlin = vc->vc_scan_lines;
854 if (v.v_clin) {
855 int rows = v.v_vlin/v.v_clin;
856 if (v.v_rows != rows) {
857 if (v.v_rows) /* Parameters don't add up */
858 return -EINVAL;
859 v.v_rows = rows;
860 }
861 }
862 if (v.v_vcol && v.v_ccol) {
863 int cols = v.v_vcol/v.v_ccol;
864 if (v.v_cols != cols) {
865 if (v.v_cols)
866 return -EINVAL;
867 v.v_cols = cols;
868 }
869 }
870
871 if (v.v_clin > 32)
872 return -EINVAL;
873
874 for (i = 0; i < MAX_NR_CONSOLES; i++) {
875 if (!vc_cons[i].d)
876 continue;
877 console_lock();
878 if (v.v_vlin)
879 vc_cons[i].d->vc_scan_lines = v.v_vlin;
880 if (v.v_clin)
881 vc_cons[i].d->vc_font.height = v.v_clin;
882 vc_cons[i].d->vc_resize_user = 1;
883 vc_resize(vc_cons[i].d, v.v_cols, v.v_rows);
884 console_unlock();
885 }
886 break;
887 }
888
889 case PIO_FONT: {
890 if (!perm)
891 return -EPERM;
892 op.op = KD_FONT_OP_SET;
893 op.flags = KD_FONT_FLAG_OLD | KD_FONT_FLAG_DONT_RECALC; /* Compatibility */
894 op.width = 8;
895 op.height = 0;
896 op.charcount = 256;
897 op.data = up;
898 ret = con_font_op(vc_cons[fg_console].d, &op);
899 break;
900 }
901
902 case GIO_FONT: {
903 op.op = KD_FONT_OP_GET;
904 op.flags = KD_FONT_FLAG_OLD;
905 op.width = 8;
906 op.height = 32;
907 op.charcount = 256;
908 op.data = up;
909 ret = con_font_op(vc_cons[fg_console].d, &op);
910 break;
911 }
912
913 case PIO_CMAP:
914 if (!perm)
915 ret = -EPERM;
916 else
917 ret = con_set_cmap(up);
918 break;
919
920 case GIO_CMAP:
921 ret = con_get_cmap(up);
922 break;
923
924 case PIO_FONTX:
925 case GIO_FONTX:
926 ret = do_fontx_ioctl(cmd, up, perm, &op);
927 break;
928
929 case PIO_FONTRESET:
930 {
931 if (!perm)
932 return -EPERM;
933
934#ifdef BROKEN_GRAPHICS_PROGRAMS
935 /* With BROKEN_GRAPHICS_PROGRAMS defined, the default
936 font is not saved. */
937 ret = -ENOSYS;
938 break;
939#else
940 {
941 op.op = KD_FONT_OP_SET_DEFAULT;
942 op.data = NULL;
943 ret = con_font_op(vc_cons[fg_console].d, &op);
944 if (ret)
945 break;
946 console_lock();
947 con_set_default_unimap(vc_cons[fg_console].d);
948 console_unlock();
949 break;
950 }
951#endif
952 }
953
954 case KDFONTOP: {
955 if (copy_from_user(&op, up, sizeof(op))) {
956 ret = -EFAULT;
957 break;
958 }
959 if (!perm && op.op != KD_FONT_OP_GET)
960 return -EPERM;
961 ret = con_font_op(vc, &op);
962 if (ret)
963 break;
964 if (copy_to_user(up, &op, sizeof(op)))
965 ret = -EFAULT;
966 break;
967 }
968
969 case PIO_SCRNMAP:
970 if (!perm)
971 ret = -EPERM;
972 else
973 ret = con_set_trans_old(up);
974 break;
975
976 case GIO_SCRNMAP:
977 ret = con_get_trans_old(up);
978 break;
979
980 case PIO_UNISCRNMAP:
981 if (!perm)
982 ret = -EPERM;
983 else
984 ret = con_set_trans_new(up);
985 break;
986
987 case GIO_UNISCRNMAP:
988 ret = con_get_trans_new(up);
989 break;
990
991 case PIO_UNIMAPCLR:
992 if (!perm)
993 return -EPERM;
994 con_clear_unimap(vc);
995 break;
996
997 case PIO_UNIMAP:
998 case GIO_UNIMAP:
999 ret = do_unimap_ioctl(cmd, up, perm, vc);
1000 break;
1001
1002 case VT_LOCKSWITCH:
1003 if (!capable(CAP_SYS_TTY_CONFIG))
1004 return -EPERM;
1005 vt_dont_switch = 1;
1006 break;
1007 case VT_UNLOCKSWITCH:
1008 if (!capable(CAP_SYS_TTY_CONFIG))
1009 return -EPERM;
1010 vt_dont_switch = 0;
1011 break;
1012 case VT_GETHIFONTMASK:
1013 ret = put_user(vc->vc_hi_font_mask,
1014 (unsigned short __user *)arg);
1015 break;
1016 case VT_WAITEVENT:
1017 ret = vt_event_wait_ioctl((struct vt_event __user *)arg);
1018 break;
1019 default:
1020 ret = -ENOIOCTLCMD;
1021 }
1022out:
1023 return ret;
1024}
1025
1026void reset_vc(struct vc_data *vc)
1027{
1028 vc->vc_mode = KD_TEXT;
1029 vt_reset_unicode(vc->vc_num);
1030 vc->vt_mode.mode = VT_AUTO;
1031 vc->vt_mode.waitv = 0;
1032 vc->vt_mode.relsig = 0;
1033 vc->vt_mode.acqsig = 0;
1034 vc->vt_mode.frsig = 0;
1035 put_pid(vc->vt_pid);
1036 vc->vt_pid = NULL;
1037 vc->vt_newvt = -1;
1038 if (!in_interrupt()) /* Via keyboard.c:SAK() - akpm */
1039 reset_palette(vc);
1040}
1041
1042void vc_SAK(struct work_struct *work)
1043{
1044 struct vc *vc_con =
1045 container_of(work, struct vc, SAK_work);
1046 struct vc_data *vc;
1047 struct tty_struct *tty;
1048
1049 console_lock();
1050 vc = vc_con->d;
1051 if (vc) {
1052 /* FIXME: review tty ref counting */
1053 tty = vc->port.tty;
1054 /*
1055 * SAK should also work in all raw modes and reset
1056 * them properly.
1057 */
1058 if (tty)
1059 __do_SAK(tty);
1060 reset_vc(vc);
1061 }
1062 console_unlock();
1063}
1064
1065#ifdef CONFIG_COMPAT
1066
1067struct compat_consolefontdesc {
1068 unsigned short charcount; /* characters in font (256 or 512) */
1069 unsigned short charheight; /* scan lines per character (1-32) */
1070 compat_caddr_t chardata; /* font data in expanded form */
1071};
1072
1073static inline int
1074compat_fontx_ioctl(int cmd, struct compat_consolefontdesc __user *user_cfd,
1075 int perm, struct console_font_op *op)
1076{
1077 struct compat_consolefontdesc cfdarg;
1078 int i;
1079
1080 if (copy_from_user(&cfdarg, user_cfd, sizeof(struct compat_consolefontdesc)))
1081 return -EFAULT;
1082
1083 switch (cmd) {
1084 case PIO_FONTX:
1085 if (!perm)
1086 return -EPERM;
1087 op->op = KD_FONT_OP_SET;
1088 op->flags = KD_FONT_FLAG_OLD;
1089 op->width = 8;
1090 op->height = cfdarg.charheight;
1091 op->charcount = cfdarg.charcount;
1092 op->data = compat_ptr(cfdarg.chardata);
1093 return con_font_op(vc_cons[fg_console].d, op);
1094 case GIO_FONTX:
1095 op->op = KD_FONT_OP_GET;
1096 op->flags = KD_FONT_FLAG_OLD;
1097 op->width = 8;
1098 op->height = cfdarg.charheight;
1099 op->charcount = cfdarg.charcount;
1100 op->data = compat_ptr(cfdarg.chardata);
1101 i = con_font_op(vc_cons[fg_console].d, op);
1102 if (i)
1103 return i;
1104 cfdarg.charheight = op->height;
1105 cfdarg.charcount = op->charcount;
1106 if (copy_to_user(user_cfd, &cfdarg, sizeof(struct compat_consolefontdesc)))
1107 return -EFAULT;
1108 return 0;
1109 }
1110 return -EINVAL;
1111}
1112
1113struct compat_console_font_op {
1114 compat_uint_t op; /* operation code KD_FONT_OP_* */
1115 compat_uint_t flags; /* KD_FONT_FLAG_* */
1116 compat_uint_t width, height; /* font size */
1117 compat_uint_t charcount;
1118 compat_caddr_t data; /* font data with height fixed to 32 */
1119};
1120
1121static inline int
1122compat_kdfontop_ioctl(struct compat_console_font_op __user *fontop,
1123 int perm, struct console_font_op *op, struct vc_data *vc)
1124{
1125 int i;
1126
1127 if (copy_from_user(op, fontop, sizeof(struct compat_console_font_op)))
1128 return -EFAULT;
1129 if (!perm && op->op != KD_FONT_OP_GET)
1130 return -EPERM;
1131 op->data = compat_ptr(((struct compat_console_font_op *)op)->data);
1132 i = con_font_op(vc, op);
1133 if (i)
1134 return i;
1135 ((struct compat_console_font_op *)op)->data = (unsigned long)op->data;
1136 if (copy_to_user(fontop, op, sizeof(struct compat_console_font_op)))
1137 return -EFAULT;
1138 return 0;
1139}
1140
1141struct compat_unimapdesc {
1142 unsigned short entry_ct;
1143 compat_caddr_t entries;
1144};
1145
1146static inline int
1147compat_unimap_ioctl(unsigned int cmd, struct compat_unimapdesc __user *user_ud,
1148 int perm, struct vc_data *vc)
1149{
1150 struct compat_unimapdesc tmp;
1151 struct unipair __user *tmp_entries;
1152
1153 if (copy_from_user(&tmp, user_ud, sizeof tmp))
1154 return -EFAULT;
1155 tmp_entries = compat_ptr(tmp.entries);
1156 switch (cmd) {
1157 case PIO_UNIMAP:
1158 if (!perm)
1159 return -EPERM;
1160 return con_set_unimap(vc, tmp.entry_ct, tmp_entries);
1161 case GIO_UNIMAP:
1162 if (!perm && fg_console != vc->vc_num)
1163 return -EPERM;
1164 return con_get_unimap(vc, tmp.entry_ct, &(user_ud->entry_ct), tmp_entries);
1165 }
1166 return 0;
1167}
1168
1169long vt_compat_ioctl(struct tty_struct *tty,
1170 unsigned int cmd, unsigned long arg)
1171{
1172 struct vc_data *vc = tty->driver_data;
1173 struct console_font_op op; /* used in multiple places here */
1174 unsigned int console;
1175 void __user *up = (void __user *)arg;
1176 int perm;
1177 int ret = 0;
1178
1179 console = vc->vc_num;
1180
1181 if (!vc_cons_allocated(console)) { /* impossible? */
1182 ret = -ENOIOCTLCMD;
1183 goto out;
1184 }
1185
1186 /*
1187 * To have permissions to do most of the vt ioctls, we either have
1188 * to be the owner of the tty, or have CAP_SYS_TTY_CONFIG.
1189 */
1190 perm = 0;
1191 if (current->signal->tty == tty || capable(CAP_SYS_TTY_CONFIG))
1192 perm = 1;
1193
1194 switch (cmd) {
1195 /*
1196 * these need special handlers for incompatible data structures
1197 */
1198 case PIO_FONTX:
1199 case GIO_FONTX:
1200 ret = compat_fontx_ioctl(cmd, up, perm, &op);
1201 break;
1202
1203 case KDFONTOP:
1204 ret = compat_kdfontop_ioctl(up, perm, &op, vc);
1205 break;
1206
1207 case PIO_UNIMAP:
1208 case GIO_UNIMAP:
1209 ret = compat_unimap_ioctl(cmd, up, perm, vc);
1210 break;
1211
1212 /*
1213 * all these treat 'arg' as an integer
1214 */
1215 case KIOCSOUND:
1216 case KDMKTONE:
1217#ifdef CONFIG_X86
1218 case KDADDIO:
1219 case KDDELIO:
1220#endif
1221 case KDSETMODE:
1222 case KDMAPDISP:
1223 case KDUNMAPDISP:
1224 case KDSKBMODE:
1225 case KDSKBMETA:
1226 case KDSKBLED:
1227 case KDSETLED:
1228 case KDSIGACCEPT:
1229 case VT_ACTIVATE:
1230 case VT_WAITACTIVE:
1231 case VT_RELDISP:
1232 case VT_DISALLOCATE:
1233 case VT_RESIZE:
1234 case VT_RESIZEX:
1235 goto fallback;
1236
1237 /*
1238 * the rest has a compatible data structure behind arg,
1239 * but we have to convert it to a proper 64 bit pointer.
1240 */
1241 default:
1242 arg = (unsigned long)compat_ptr(arg);
1243 goto fallback;
1244 }
1245out:
1246 return ret;
1247
1248fallback:
1249 return vt_ioctl(tty, cmd, arg);
1250}
1251
1252
1253#endif /* CONFIG_COMPAT */
1254
1255
1256/*
1257 * Performs the back end of a vt switch. Called under the console
1258 * semaphore.
1259 */
1260static void complete_change_console(struct vc_data *vc)
1261{
1262 unsigned char old_vc_mode;
1263 int old = fg_console;
1264
1265 last_console = fg_console;
1266
1267 /*
1268 * If we're switching, we could be going from KD_GRAPHICS to
1269 * KD_TEXT mode or vice versa, which means we need to blank or
1270 * unblank the screen later.
1271 */
1272 old_vc_mode = vc_cons[fg_console].d->vc_mode;
1273 switch_screen(vc);
1274
1275 /*
1276 * This can't appear below a successful kill_pid(). If it did,
1277 * then the *blank_screen operation could occur while X, having
1278 * received acqsig, is waking up on another processor. This
1279 * condition can lead to overlapping accesses to the VGA range
1280 * and the framebuffer (causing system lockups).
1281 *
1282 * To account for this we duplicate this code below only if the
1283 * controlling process is gone and we've called reset_vc.
1284 */
1285 if (old_vc_mode != vc->vc_mode) {
1286 if (vc->vc_mode == KD_TEXT)
1287 do_unblank_screen(1);
1288 else
1289 do_blank_screen(1);
1290 }
1291
1292 /*
1293 * If this new console is under process control, send it a signal
1294 * telling it that it has acquired. Also check if it has died and
1295 * clean up (similar to logic employed in change_console())
1296 */
1297 if (vc->vt_mode.mode == VT_PROCESS) {
1298 /*
1299 * Send the signal as privileged - kill_pid() will
1300 * tell us if the process has gone or something else
1301 * is awry
1302 */
1303 if (kill_pid(vc->vt_pid, vc->vt_mode.acqsig, 1) != 0) {
1304 /*
1305 * The controlling process has died, so we revert back to
1306 * normal operation. In this case, we'll also change back
1307 * to KD_TEXT mode. I'm not sure if this is strictly correct
1308 * but it saves the agony when the X server dies and the screen
1309 * remains blanked due to KD_GRAPHICS! It would be nice to do
1310 * this outside of VT_PROCESS but there is no single process
1311 * to account for and tracking tty count may be undesirable.
1312 */
1313 reset_vc(vc);
1314
1315 if (old_vc_mode != vc->vc_mode) {
1316 if (vc->vc_mode == KD_TEXT)
1317 do_unblank_screen(1);
1318 else
1319 do_blank_screen(1);
1320 }
1321 }
1322 }
1323
1324 /*
1325 * Wake anyone waiting for their VT to activate
1326 */
1327 vt_event_post(VT_EVENT_SWITCH, old, vc->vc_num);
1328 return;
1329}
1330
1331/*
1332 * Performs the front-end of a vt switch
1333 */
1334void change_console(struct vc_data *new_vc)
1335{
1336 struct vc_data *vc;
1337
1338 if (!new_vc || new_vc->vc_num == fg_console || vt_dont_switch)
1339 return;
1340
1341 /*
1342 * If this vt is in process mode, then we need to handshake with
1343 * that process before switching. Essentially, we store where that
1344 * vt wants to switch to and wait for it to tell us when it's done
1345 * (via VT_RELDISP ioctl).
1346 *
1347 * We also check to see if the controlling process still exists.
1348 * If it doesn't, we reset this vt to auto mode and continue.
1349 * This is a cheap way to track process control. The worst thing
1350 * that can happen is: we send a signal to a process, it dies, and
1351 * the switch gets "lost" waiting for a response; hopefully, the
1352 * user will try again, we'll detect the process is gone (unless
1353 * the user waits just the right amount of time :-) and revert the
1354 * vt to auto control.
1355 */
1356 vc = vc_cons[fg_console].d;
1357 if (vc->vt_mode.mode == VT_PROCESS) {
1358 /*
1359 * Send the signal as privileged - kill_pid() will
1360 * tell us if the process has gone or something else
1361 * is awry.
1362 *
1363 * We need to set vt_newvt *before* sending the signal or we
1364 * have a race.
1365 */
1366 vc->vt_newvt = new_vc->vc_num;
1367 if (kill_pid(vc->vt_pid, vc->vt_mode.relsig, 1) == 0) {
1368 /*
1369 * It worked. Mark the vt to switch to and
1370 * return. The process needs to send us a
1371 * VT_RELDISP ioctl to complete the switch.
1372 */
1373 return;
1374 }
1375
1376 /*
1377 * The controlling process has died, so we revert back to
1378 * normal operation. In this case, we'll also change back
1379 * to KD_TEXT mode. I'm not sure if this is strictly correct
1380 * but it saves the agony when the X server dies and the screen
1381 * remains blanked due to KD_GRAPHICS! It would be nice to do
1382 * this outside of VT_PROCESS but there is no single process
1383 * to account for and tracking tty count may be undesirable.
1384 */
1385 reset_vc(vc);
1386
1387 /*
1388 * Fall through to normal (VT_AUTO) handling of the switch...
1389 */
1390 }
1391
1392 /*
1393 * Ignore all switches in KD_GRAPHICS+VT_AUTO mode
1394 */
1395 if (vc->vc_mode == KD_GRAPHICS)
1396 return;
1397
1398 complete_change_console(new_vc);
1399}
1400
1401/* Perform a kernel triggered VT switch for suspend/resume */
1402
1403static int disable_vt_switch;
1404
1405int vt_move_to_console(unsigned int vt, int alloc)
1406{
1407 int prev;
1408
1409 console_lock();
1410 /* Graphics mode - up to X */
1411 if (disable_vt_switch) {
1412 console_unlock();
1413 return 0;
1414 }
1415 prev = fg_console;
1416
1417 if (alloc && vc_allocate(vt)) {
1418 /* we can't have a free VC for now. Too bad,
1419 * we don't want to mess the screen for now. */
1420 console_unlock();
1421 return -ENOSPC;
1422 }
1423
1424 if (set_console(vt)) {
1425 /*
1426 * We're unable to switch to the SUSPEND_CONSOLE.
1427 * Let the calling function know so it can decide
1428 * what to do.
1429 */
1430 console_unlock();
1431 return -EIO;
1432 }
1433 console_unlock();
1434 if (vt_waitactive(vt + 1)) {
1435 pr_debug("Suspend: Can't switch VCs.");
1436 return -EINTR;
1437 }
1438 return prev;
1439}
1440
1441/*
1442 * Normally during a suspend, we allocate a new console and switch to it.
1443 * When we resume, we switch back to the original console. This switch
1444 * can be slow, so on systems where the framebuffer can handle restoration
1445 * of video registers anyways, there's little point in doing the console
1446 * switch. This function allows you to disable it by passing it '0'.
1447 */
1448void pm_set_vt_switch(int do_switch)
1449{
1450 console_lock();
1451 disable_vt_switch = !do_switch;
1452 console_unlock();
1453}
1454EXPORT_SYMBOL(pm_set_vt_switch);