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