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