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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/*
2 * Copyright (C) 1992 obz under the linux copyright
3 *
4 * Dynamic diacritical handling - aeb@cwi.nl - Dec 1993
5 * Dynamic keymap and string allocation - aeb@cwi.nl - May 1994
6 * Restrict VT switching via ioctl() - grif@cs.ucr.edu - Dec 1995
7 * Some code moved for less code duplication - Andi Kleen - Mar 1997
8 * Check put/get_user, cleanups - acme@conectiva.com.br - Jun 2001
9 */
10
11#include <linux/types.h>
12#include <linux/errno.h>
13#include <linux/sched.h>
14#include <linux/tty.h>
15#include <linux/timer.h>
16#include <linux/kernel.h>
17#include <linux/compat.h>
18#include <linux/module.h>
19#include <linux/kd.h>
20#include <linux/vt.h>
21#include <linux/string.h>
22#include <linux/slab.h>
23#include <linux/major.h>
24#include <linux/fs.h>
25#include <linux/console.h>
26#include <linux/consolemap.h>
27#include <linux/signal.h>
28#include <linux/suspend.h>
29#include <linux/timex.h>
30
31#include <asm/io.h>
32#include <asm/uaccess.h>
33
34#include <linux/kbd_kern.h>
35#include <linux/vt_kern.h>
36#include <linux/kbd_diacr.h>
37#include <linux/selection.h>
38
39char vt_dont_switch;
40extern struct tty_driver *console_driver;
41
42#define VT_IS_IN_USE(i) (console_driver->ttys[i] && console_driver->ttys[i]->count)
43#define VT_BUSY(i) (VT_IS_IN_USE(i) || i == fg_console || vc_cons[i].d == sel_cons)
44
45/*
46 * Console (vt and kd) routines, as defined by USL SVR4 manual, and by
47 * experimentation and study of X386 SYSV handling.
48 *
49 * One point of difference: SYSV vt's are /dev/vtX, which X >= 0, and
50 * /dev/console is a separate ttyp. Under Linux, /dev/tty0 is /dev/console,
51 * and the vc start at /dev/ttyX, X >= 1. We maintain that here, so we will
52 * always treat our set of vt as numbered 1..MAX_NR_CONSOLES (corresponding to
53 * ttys 0..MAX_NR_CONSOLES-1). Explicitly naming VT 0 is illegal, but using
54 * /dev/tty0 (fg_console) as a target is legal, since an implicit aliasing
55 * to the current console is done by the main ioctl code.
56 */
57
58#ifdef CONFIG_X86
59#include <linux/syscalls.h>
60#endif
61
62static void complete_change_console(struct vc_data *vc);
63
64/*
65 * User space VT_EVENT handlers
66 */
67
68struct vt_event_wait {
69 struct list_head list;
70 struct vt_event event;
71 int done;
72};
73
74static LIST_HEAD(vt_events);
75static DEFINE_SPINLOCK(vt_event_lock);
76static DECLARE_WAIT_QUEUE_HEAD(vt_event_waitqueue);
77
78/**
79 * vt_event_post
80 * @event: the event that occurred
81 * @old: old console
82 * @new: new console
83 *
84 * Post an VT event to interested VT handlers
85 */
86
87void vt_event_post(unsigned int event, unsigned int old, unsigned int new)
88{
89 struct list_head *pos, *head;
90 unsigned long flags;
91 int wake = 0;
92
93 spin_lock_irqsave(&vt_event_lock, flags);
94 head = &vt_events;
95
96 list_for_each(pos, head) {
97 struct vt_event_wait *ve = list_entry(pos,
98 struct vt_event_wait, list);
99 if (!(ve->event.event & event))
100 continue;
101 ve->event.event = event;
102 /* kernel view is consoles 0..n-1, user space view is
103 console 1..n with 0 meaning current, so we must bias */
104 ve->event.oldev = old + 1;
105 ve->event.newev = new + 1;
106 wake = 1;
107 ve->done = 1;
108 }
109 spin_unlock_irqrestore(&vt_event_lock, flags);
110 if (wake)
111 wake_up_interruptible(&vt_event_waitqueue);
112}
113
114static void __vt_event_queue(struct vt_event_wait *vw)
115{
116 unsigned long flags;
117 /* Prepare the event */
118 INIT_LIST_HEAD(&vw->list);
119 vw->done = 0;
120 /* Queue our event */
121 spin_lock_irqsave(&vt_event_lock, flags);
122 list_add(&vw->list, &vt_events);
123 spin_unlock_irqrestore(&vt_event_lock, flags);
124}
125
126static void __vt_event_wait(struct vt_event_wait *vw)
127{
128 /* Wait for it to pass */
129 wait_event_interruptible(vt_event_waitqueue, vw->done);
130}
131
132static void __vt_event_dequeue(struct vt_event_wait *vw)
133{
134 unsigned long flags;
135
136 /* Dequeue it */
137 spin_lock_irqsave(&vt_event_lock, flags);
138 list_del(&vw->list);
139 spin_unlock_irqrestore(&vt_event_lock, flags);
140}
141
142/**
143 * vt_event_wait - wait for an event
144 * @vw: our event
145 *
146 * Waits for an event to occur which completes our vt_event_wait
147 * structure. On return the structure has wv->done set to 1 for success
148 * or 0 if some event such as a signal ended the wait.
149 */
150
151static void vt_event_wait(struct vt_event_wait *vw)
152{
153 __vt_event_queue(vw);
154 __vt_event_wait(vw);
155 __vt_event_dequeue(vw);
156}
157
158/**
159 * vt_event_wait_ioctl - event ioctl handler
160 * @arg: argument to ioctl
161 *
162 * Implement the VT_WAITEVENT ioctl using the VT event interface
163 */
164
165static int vt_event_wait_ioctl(struct vt_event __user *event)
166{
167 struct vt_event_wait vw;
168
169 if (copy_from_user(&vw.event, event, sizeof(struct vt_event)))
170 return -EFAULT;
171 /* Highest supported event for now */
172 if (vw.event.event & ~VT_MAX_EVENT)
173 return -EINVAL;
174
175 vt_event_wait(&vw);
176 /* If it occurred report it */
177 if (vw.done) {
178 if (copy_to_user(event, &vw.event, sizeof(struct vt_event)))
179 return -EFAULT;
180 return 0;
181 }
182 return -EINTR;
183}
184
185/**
186 * vt_waitactive - active console wait
187 * @event: event code
188 * @n: new console
189 *
190 * Helper for event waits. Used to implement the legacy
191 * event waiting ioctls in terms of events
192 */
193
194int vt_waitactive(int n)
195{
196 struct vt_event_wait vw;
197 do {
198 vw.event.event = VT_EVENT_SWITCH;
199 __vt_event_queue(&vw);
200 if (n == fg_console + 1) {
201 __vt_event_dequeue(&vw);
202 break;
203 }
204 __vt_event_wait(&vw);
205 __vt_event_dequeue(&vw);
206 if (vw.done == 0)
207 return -EINTR;
208 } while (vw.event.newev != n);
209 return 0;
210}
211
212/*
213 * these are the valid i/o ports we're allowed to change. they map all the
214 * video ports
215 */
216#define GPFIRST 0x3b4
217#define GPLAST 0x3df
218#define GPNUM (GPLAST - GPFIRST + 1)
219
220
221
222static inline int
223do_fontx_ioctl(int cmd, struct consolefontdesc __user *user_cfd, int perm, struct console_font_op *op)
224{
225 struct consolefontdesc cfdarg;
226 int i;
227
228 if (copy_from_user(&cfdarg, user_cfd, sizeof(struct consolefontdesc)))
229 return -EFAULT;
230
231 switch (cmd) {
232 case PIO_FONTX:
233 if (!perm)
234 return -EPERM;
235 op->op = KD_FONT_OP_SET;
236 op->flags = KD_FONT_FLAG_OLD;
237 op->width = 8;
238 op->height = cfdarg.charheight;
239 op->charcount = cfdarg.charcount;
240 op->data = cfdarg.chardata;
241 return con_font_op(vc_cons[fg_console].d, op);
242 case GIO_FONTX: {
243 op->op = KD_FONT_OP_GET;
244 op->flags = KD_FONT_FLAG_OLD;
245 op->width = 8;
246 op->height = cfdarg.charheight;
247 op->charcount = cfdarg.charcount;
248 op->data = cfdarg.chardata;
249 i = con_font_op(vc_cons[fg_console].d, op);
250 if (i)
251 return i;
252 cfdarg.charheight = op->height;
253 cfdarg.charcount = op->charcount;
254 if (copy_to_user(user_cfd, &cfdarg, sizeof(struct consolefontdesc)))
255 return -EFAULT;
256 return 0;
257 }
258 }
259 return -EINVAL;
260}
261
262static inline int
263do_unimap_ioctl(int cmd, struct unimapdesc __user *user_ud, int perm, struct vc_data *vc)
264{
265 struct unimapdesc tmp;
266
267 if (copy_from_user(&tmp, user_ud, sizeof tmp))
268 return -EFAULT;
269 if (tmp.entries)
270 if (!access_ok(VERIFY_WRITE, tmp.entries,
271 tmp.entry_ct*sizeof(struct unipair)))
272 return -EFAULT;
273 switch (cmd) {
274 case PIO_UNIMAP:
275 if (!perm)
276 return -EPERM;
277 return con_set_unimap(vc, tmp.entry_ct, tmp.entries);
278 case GIO_UNIMAP:
279 if (!perm && fg_console != vc->vc_num)
280 return -EPERM;
281 return con_get_unimap(vc, tmp.entry_ct, &(user_ud->entry_ct), tmp.entries);
282 }
283 return 0;
284}
285
286/* deallocate a single console, if possible (leave 0) */
287static int vt_disallocate(unsigned int vc_num)
288{
289 struct vc_data *vc = NULL;
290 int ret = 0;
291
292 console_lock();
293 if (VT_BUSY(vc_num))
294 ret = -EBUSY;
295 else if (vc_num)
296 vc = vc_deallocate(vc_num);
297 console_unlock();
298
299 if (vc && vc_num >= MIN_NR_CONSOLES) {
300 tty_port_destroy(&vc->port);
301 kfree(vc);
302 }
303
304 return ret;
305}
306
307/* deallocate all unused consoles, but leave 0 */
308static void vt_disallocate_all(void)
309{
310 struct vc_data *vc[MAX_NR_CONSOLES];
311 int i;
312
313 console_lock();
314 for (i = 1; i < MAX_NR_CONSOLES; i++)
315 if (!VT_BUSY(i))
316 vc[i] = vc_deallocate(i);
317 else
318 vc[i] = NULL;
319 console_unlock();
320
321 for (i = 1; i < MAX_NR_CONSOLES; i++) {
322 if (vc[i] && i >= MIN_NR_CONSOLES) {
323 tty_port_destroy(&vc[i]->port);
324 kfree(vc[i]);
325 }
326 }
327}
328
329
330/*
331 * We handle the console-specific ioctl's here. We allow the
332 * capability to modify any console, not just the fg_console.
333 */
334int vt_ioctl(struct tty_struct *tty,
335 unsigned int cmd, unsigned long arg)
336{
337 struct vc_data *vc = tty->driver_data;
338 struct console_font_op op; /* used in multiple places here */
339 unsigned int console;
340 unsigned char ucval;
341 unsigned int uival;
342 void __user *up = (void __user *)arg;
343 int i, perm;
344 int ret = 0;
345
346 console = vc->vc_num;
347
348
349 if (!vc_cons_allocated(console)) { /* impossible? */
350 ret = -ENOIOCTLCMD;
351 goto out;
352 }
353
354
355 /*
356 * To have permissions to do most of the vt ioctls, we either have
357 * to be the owner of the tty, or have CAP_SYS_TTY_CONFIG.
358 */
359 perm = 0;
360 if (current->signal->tty == tty || capable(CAP_SYS_TTY_CONFIG))
361 perm = 1;
362
363 switch (cmd) {
364 case TIOCLINUX:
365 ret = tioclinux(tty, arg);
366 break;
367 case KIOCSOUND:
368 if (!perm)
369 return -EPERM;
370 /*
371 * The use of PIT_TICK_RATE is historic, it used to be
372 * the platform-dependent CLOCK_TICK_RATE between 2.6.12
373 * and 2.6.36, which was a minor but unfortunate ABI
374 * change. kd_mksound is locked by the input layer.
375 */
376 if (arg)
377 arg = PIT_TICK_RATE / arg;
378 kd_mksound(arg, 0);
379 break;
380
381 case KDMKTONE:
382 if (!perm)
383 return -EPERM;
384 {
385 unsigned int ticks, count;
386
387 /*
388 * Generate the tone for the appropriate number of ticks.
389 * If the time is zero, turn off sound ourselves.
390 */
391 ticks = HZ * ((arg >> 16) & 0xffff) / 1000;
392 count = ticks ? (arg & 0xffff) : 0;
393 if (count)
394 count = PIT_TICK_RATE / count;
395 kd_mksound(count, ticks);
396 break;
397 }
398
399 case KDGKBTYPE:
400 /*
401 * this is naïve.
402 */
403 ucval = KB_101;
404 ret = put_user(ucval, (char __user *)arg);
405 break;
406
407 /*
408 * These cannot be implemented on any machine that implements
409 * ioperm() in user level (such as Alpha PCs) or not at all.
410 *
411 * XXX: you should never use these, just call ioperm directly..
412 */
413#ifdef CONFIG_X86
414 case KDADDIO:
415 case KDDELIO:
416 /*
417 * KDADDIO and KDDELIO may be able to add ports beyond what
418 * we reject here, but to be safe...
419 *
420 * These are locked internally via sys_ioperm
421 */
422 if (arg < GPFIRST || arg > GPLAST) {
423 ret = -EINVAL;
424 break;
425 }
426 ret = sys_ioperm(arg, 1, (cmd == KDADDIO)) ? -ENXIO : 0;
427 break;
428
429 case KDENABIO:
430 case KDDISABIO:
431 ret = sys_ioperm(GPFIRST, GPNUM,
432 (cmd == KDENABIO)) ? -ENXIO : 0;
433 break;
434#endif
435
436 /* Linux m68k/i386 interface for setting the keyboard delay/repeat rate */
437
438 case KDKBDREP:
439 {
440 struct kbd_repeat kbrep;
441
442 if (!capable(CAP_SYS_TTY_CONFIG))
443 return -EPERM;
444
445 if (copy_from_user(&kbrep, up, sizeof(struct kbd_repeat))) {
446 ret = -EFAULT;
447 break;
448 }
449 ret = kbd_rate(&kbrep);
450 if (ret)
451 break;
452 if (copy_to_user(up, &kbrep, sizeof(struct kbd_repeat)))
453 ret = -EFAULT;
454 break;
455 }
456
457 case KDSETMODE:
458 /*
459 * currently, setting the mode from KD_TEXT to KD_GRAPHICS
460 * doesn't do a whole lot. i'm not sure if it should do any
461 * restoration of modes or what...
462 *
463 * XXX It should at least call into the driver, fbdev's definitely
464 * need to restore their engine state. --BenH
465 */
466 if (!perm)
467 return -EPERM;
468 switch (arg) {
469 case KD_GRAPHICS:
470 break;
471 case KD_TEXT0:
472 case KD_TEXT1:
473 arg = KD_TEXT;
474 case KD_TEXT:
475 break;
476 default:
477 ret = -EINVAL;
478 goto out;
479 }
480 /* FIXME: this needs the console lock extending */
481 if (vc->vc_mode == (unsigned char) arg)
482 break;
483 vc->vc_mode = (unsigned char) arg;
484 if (console != fg_console)
485 break;
486 /*
487 * explicitly blank/unblank the screen if switching modes
488 */
489 console_lock();
490 if (arg == KD_TEXT)
491 do_unblank_screen(1);
492 else
493 do_blank_screen(1);
494 console_unlock();
495 break;
496
497 case KDGETMODE:
498 uival = vc->vc_mode;
499 goto setint;
500
501 case KDMAPDISP:
502 case KDUNMAPDISP:
503 /*
504 * these work like a combination of mmap and KDENABIO.
505 * this could be easily finished.
506 */
507 ret = -EINVAL;
508 break;
509
510 case KDSKBMODE:
511 if (!perm)
512 return -EPERM;
513 ret = vt_do_kdskbmode(console, arg);
514 if (ret == 0)
515 tty_ldisc_flush(tty);
516 break;
517
518 case KDGKBMODE:
519 uival = vt_do_kdgkbmode(console);
520 ret = put_user(uival, (int __user *)arg);
521 break;
522
523 /* this could be folded into KDSKBMODE, but for compatibility
524 reasons it is not so easy to fold KDGKBMETA into KDGKBMODE */
525 case KDSKBMETA:
526 ret = vt_do_kdskbmeta(console, arg);
527 break;
528
529 case KDGKBMETA:
530 /* FIXME: should review whether this is worth locking */
531 uival = vt_do_kdgkbmeta(console);
532 setint:
533 ret = put_user(uival, (int __user *)arg);
534 break;
535
536 case KDGETKEYCODE:
537 case KDSETKEYCODE:
538 if(!capable(CAP_SYS_TTY_CONFIG))
539 perm = 0;
540 ret = vt_do_kbkeycode_ioctl(cmd, up, perm);
541 break;
542
543 case KDGKBENT:
544 case KDSKBENT:
545 ret = vt_do_kdsk_ioctl(cmd, up, perm, console);
546 break;
547
548 case KDGKBSENT:
549 case KDSKBSENT:
550 ret = vt_do_kdgkb_ioctl(cmd, up, perm);
551 break;
552
553 /* Diacritical processing. Handled in keyboard.c as it has
554 to operate on the keyboard locks and structures */
555 case KDGKBDIACR:
556 case KDGKBDIACRUC:
557 case KDSKBDIACR:
558 case KDSKBDIACRUC:
559 ret = vt_do_diacrit(cmd, up, perm);
560 break;
561
562 /* the ioctls below read/set the flags usually shown in the leds */
563 /* don't use them - they will go away without warning */
564 case KDGKBLED:
565 case KDSKBLED:
566 case KDGETLED:
567 case KDSETLED:
568 ret = vt_do_kdskled(console, cmd, arg, perm);
569 break;
570
571 /*
572 * A process can indicate its willingness to accept signals
573 * generated by pressing an appropriate key combination.
574 * Thus, one can have a daemon that e.g. spawns a new console
575 * upon a keypress and then changes to it.
576 * See also the kbrequest field of inittab(5).
577 */
578 case KDSIGACCEPT:
579 {
580 if (!perm || !capable(CAP_KILL))
581 return -EPERM;
582 if (!valid_signal(arg) || arg < 1 || arg == SIGKILL)
583 ret = -EINVAL;
584 else {
585 spin_lock_irq(&vt_spawn_con.lock);
586 put_pid(vt_spawn_con.pid);
587 vt_spawn_con.pid = get_pid(task_pid(current));
588 vt_spawn_con.sig = arg;
589 spin_unlock_irq(&vt_spawn_con.lock);
590 }
591 break;
592 }
593
594 case VT_SETMODE:
595 {
596 struct vt_mode tmp;
597
598 if (!perm)
599 return -EPERM;
600 if (copy_from_user(&tmp, up, sizeof(struct vt_mode))) {
601 ret = -EFAULT;
602 goto out;
603 }
604 if (tmp.mode != VT_AUTO && tmp.mode != VT_PROCESS) {
605 ret = -EINVAL;
606 goto out;
607 }
608 console_lock();
609 vc->vt_mode = tmp;
610 /* the frsig is ignored, so we set it to 0 */
611 vc->vt_mode.frsig = 0;
612 put_pid(vc->vt_pid);
613 vc->vt_pid = get_pid(task_pid(current));
614 /* no switch is required -- saw@shade.msu.ru */
615 vc->vt_newvt = -1;
616 console_unlock();
617 break;
618 }
619
620 case VT_GETMODE:
621 {
622 struct vt_mode tmp;
623 int rc;
624
625 console_lock();
626 memcpy(&tmp, &vc->vt_mode, sizeof(struct vt_mode));
627 console_unlock();
628
629 rc = copy_to_user(up, &tmp, sizeof(struct vt_mode));
630 if (rc)
631 ret = -EFAULT;
632 break;
633 }
634
635 /*
636 * Returns global vt state. Note that VT 0 is always open, since
637 * it's an alias for the current VT, and people can't use it here.
638 * We cannot return state for more than 16 VTs, since v_state is short.
639 */
640 case VT_GETSTATE:
641 {
642 struct vt_stat __user *vtstat = up;
643 unsigned short state, mask;
644
645 /* Review: FIXME: Console lock ? */
646 if (put_user(fg_console + 1, &vtstat->v_active))
647 ret = -EFAULT;
648 else {
649 state = 1; /* /dev/tty0 is always open */
650 for (i = 0, mask = 2; i < MAX_NR_CONSOLES && mask;
651 ++i, mask <<= 1)
652 if (VT_IS_IN_USE(i))
653 state |= mask;
654 ret = put_user(state, &vtstat->v_state);
655 }
656 break;
657 }
658
659 /*
660 * Returns the first available (non-opened) console.
661 */
662 case VT_OPENQRY:
663 /* FIXME: locking ? - but then this is a stupid API */
664 for (i = 0; i < MAX_NR_CONSOLES; ++i)
665 if (! VT_IS_IN_USE(i))
666 break;
667 uival = i < MAX_NR_CONSOLES ? (i+1) : -1;
668 goto setint;
669
670 /*
671 * ioctl(fd, VT_ACTIVATE, num) will cause us to switch to vt # num,
672 * with num >= 1 (switches to vt 0, our console, are not allowed, just
673 * to preserve sanity).
674 */
675 case VT_ACTIVATE:
676 if (!perm)
677 return -EPERM;
678 if (arg == 0 || arg > MAX_NR_CONSOLES)
679 ret = -ENXIO;
680 else {
681 arg--;
682 console_lock();
683 ret = vc_allocate(arg);
684 console_unlock();
685 if (ret)
686 break;
687 set_console(arg);
688 }
689 break;
690
691 case VT_SETACTIVATE:
692 {
693 struct vt_setactivate vsa;
694
695 if (!perm)
696 return -EPERM;
697
698 if (copy_from_user(&vsa, (struct vt_setactivate __user *)arg,
699 sizeof(struct vt_setactivate))) {
700 ret = -EFAULT;
701 goto out;
702 }
703 if (vsa.console == 0 || vsa.console > MAX_NR_CONSOLES)
704 ret = -ENXIO;
705 else {
706 vsa.console--;
707 console_lock();
708 ret = vc_allocate(vsa.console);
709 if (ret == 0) {
710 struct vc_data *nvc;
711 /* This is safe providing we don't drop the
712 console sem between vc_allocate and
713 finishing referencing nvc */
714 nvc = vc_cons[vsa.console].d;
715 nvc->vt_mode = vsa.mode;
716 nvc->vt_mode.frsig = 0;
717 put_pid(nvc->vt_pid);
718 nvc->vt_pid = get_pid(task_pid(current));
719 }
720 console_unlock();
721 if (ret)
722 break;
723 /* Commence switch and lock */
724 /* Review set_console locks */
725 set_console(vsa.console);
726 }
727 break;
728 }
729
730 /*
731 * wait until the specified VT has been activated
732 */
733 case VT_WAITACTIVE:
734 if (!perm)
735 return -EPERM;
736 if (arg == 0 || arg > MAX_NR_CONSOLES)
737 ret = -ENXIO;
738 else
739 ret = vt_waitactive(arg);
740 break;
741
742 /*
743 * If a vt is under process control, the kernel will not switch to it
744 * immediately, but postpone the operation until the process calls this
745 * ioctl, allowing the switch to complete.
746 *
747 * According to the X sources this is the behavior:
748 * 0: pending switch-from not OK
749 * 1: pending switch-from OK
750 * 2: completed switch-to OK
751 */
752 case VT_RELDISP:
753 if (!perm)
754 return -EPERM;
755
756 console_lock();
757 if (vc->vt_mode.mode != VT_PROCESS) {
758 console_unlock();
759 ret = -EINVAL;
760 break;
761 }
762 /*
763 * Switching-from response
764 */
765 if (vc->vt_newvt >= 0) {
766 if (arg == 0)
767 /*
768 * Switch disallowed, so forget we were trying
769 * to do it.
770 */
771 vc->vt_newvt = -1;
772
773 else {
774 /*
775 * The current vt has been released, so
776 * complete the switch.
777 */
778 int newvt;
779 newvt = vc->vt_newvt;
780 vc->vt_newvt = -1;
781 ret = vc_allocate(newvt);
782 if (ret) {
783 console_unlock();
784 break;
785 }
786 /*
787 * When we actually do the console switch,
788 * make sure we are atomic with respect to
789 * other console switches..
790 */
791 complete_change_console(vc_cons[newvt].d);
792 }
793 } else {
794 /*
795 * Switched-to response
796 */
797 /*
798 * If it's just an ACK, ignore it
799 */
800 if (arg != VT_ACKACQ)
801 ret = -EINVAL;
802 }
803 console_unlock();
804 break;
805
806 /*
807 * Disallocate memory associated to VT (but leave VT1)
808 */
809 case VT_DISALLOCATE:
810 if (arg > MAX_NR_CONSOLES) {
811 ret = -ENXIO;
812 break;
813 }
814 if (arg == 0)
815 vt_disallocate_all();
816 else
817 ret = vt_disallocate(--arg);
818 break;
819
820 case VT_RESIZE:
821 {
822 struct vt_sizes __user *vtsizes = up;
823 struct vc_data *vc;
824
825 ushort ll,cc;
826 if (!perm)
827 return -EPERM;
828 if (get_user(ll, &vtsizes->v_rows) ||
829 get_user(cc, &vtsizes->v_cols))
830 ret = -EFAULT;
831 else {
832 console_lock();
833 for (i = 0; i < MAX_NR_CONSOLES; i++) {
834 vc = vc_cons[i].d;
835
836 if (vc) {
837 vc->vc_resize_user = 1;
838 /* FIXME: review v tty lock */
839 vc_resize(vc_cons[i].d, cc, ll);
840 }
841 }
842 console_unlock();
843 }
844 break;
845 }
846
847 case VT_RESIZEX:
848 {
849 struct vt_consize __user *vtconsize = up;
850 ushort ll,cc,vlin,clin,vcol,ccol;
851 if (!perm)
852 return -EPERM;
853 if (!access_ok(VERIFY_READ, vtconsize,
854 sizeof(struct vt_consize))) {
855 ret = -EFAULT;
856 break;
857 }
858 /* FIXME: Should check the copies properly */
859 __get_user(ll, &vtconsize->v_rows);
860 __get_user(cc, &vtconsize->v_cols);
861 __get_user(vlin, &vtconsize->v_vlin);
862 __get_user(clin, &vtconsize->v_clin);
863 __get_user(vcol, &vtconsize->v_vcol);
864 __get_user(ccol, &vtconsize->v_ccol);
865 vlin = vlin ? vlin : vc->vc_scan_lines;
866 if (clin) {
867 if (ll) {
868 if (ll != vlin/clin) {
869 /* Parameters don't add up */
870 ret = -EINVAL;
871 break;
872 }
873 } else
874 ll = vlin/clin;
875 }
876 if (vcol && ccol) {
877 if (cc) {
878 if (cc != vcol/ccol) {
879 ret = -EINVAL;
880 break;
881 }
882 } else
883 cc = vcol/ccol;
884 }
885
886 if (clin > 32) {
887 ret = -EINVAL;
888 break;
889 }
890
891 for (i = 0; i < MAX_NR_CONSOLES; i++) {
892 if (!vc_cons[i].d)
893 continue;
894 console_lock();
895 if (vlin)
896 vc_cons[i].d->vc_scan_lines = vlin;
897 if (clin)
898 vc_cons[i].d->vc_font.height = clin;
899 vc_cons[i].d->vc_resize_user = 1;
900 vc_resize(vc_cons[i].d, cc, ll);
901 console_unlock();
902 }
903 break;
904 }
905
906 case PIO_FONT: {
907 if (!perm)
908 return -EPERM;
909 op.op = KD_FONT_OP_SET;
910 op.flags = KD_FONT_FLAG_OLD | KD_FONT_FLAG_DONT_RECALC; /* Compatibility */
911 op.width = 8;
912 op.height = 0;
913 op.charcount = 256;
914 op.data = up;
915 ret = con_font_op(vc_cons[fg_console].d, &op);
916 break;
917 }
918
919 case GIO_FONT: {
920 op.op = KD_FONT_OP_GET;
921 op.flags = KD_FONT_FLAG_OLD;
922 op.width = 8;
923 op.height = 32;
924 op.charcount = 256;
925 op.data = up;
926 ret = con_font_op(vc_cons[fg_console].d, &op);
927 break;
928 }
929
930 case PIO_CMAP:
931 if (!perm)
932 ret = -EPERM;
933 else
934 ret = con_set_cmap(up);
935 break;
936
937 case GIO_CMAP:
938 ret = con_get_cmap(up);
939 break;
940
941 case PIO_FONTX:
942 case GIO_FONTX:
943 ret = do_fontx_ioctl(cmd, up, perm, &op);
944 break;
945
946 case PIO_FONTRESET:
947 {
948 if (!perm)
949 return -EPERM;
950
951#ifdef BROKEN_GRAPHICS_PROGRAMS
952 /* With BROKEN_GRAPHICS_PROGRAMS defined, the default
953 font is not saved. */
954 ret = -ENOSYS;
955 break;
956#else
957 {
958 op.op = KD_FONT_OP_SET_DEFAULT;
959 op.data = NULL;
960 ret = con_font_op(vc_cons[fg_console].d, &op);
961 if (ret)
962 break;
963 console_lock();
964 con_set_default_unimap(vc_cons[fg_console].d);
965 console_unlock();
966 break;
967 }
968#endif
969 }
970
971 case KDFONTOP: {
972 if (copy_from_user(&op, up, sizeof(op))) {
973 ret = -EFAULT;
974 break;
975 }
976 if (!perm && op.op != KD_FONT_OP_GET)
977 return -EPERM;
978 ret = con_font_op(vc, &op);
979 if (ret)
980 break;
981 if (copy_to_user(up, &op, sizeof(op)))
982 ret = -EFAULT;
983 break;
984 }
985
986 case PIO_SCRNMAP:
987 if (!perm)
988 ret = -EPERM;
989 else
990 ret = con_set_trans_old(up);
991 break;
992
993 case GIO_SCRNMAP:
994 ret = con_get_trans_old(up);
995 break;
996
997 case PIO_UNISCRNMAP:
998 if (!perm)
999 ret = -EPERM;
1000 else
1001 ret = con_set_trans_new(up);
1002 break;
1003
1004 case GIO_UNISCRNMAP:
1005 ret = con_get_trans_new(up);
1006 break;
1007
1008 case PIO_UNIMAPCLR:
1009 { struct unimapinit ui;
1010 if (!perm)
1011 return -EPERM;
1012 ret = copy_from_user(&ui, up, sizeof(struct unimapinit));
1013 if (ret)
1014 ret = -EFAULT;
1015 else
1016 con_clear_unimap(vc, &ui);
1017 break;
1018 }
1019
1020 case PIO_UNIMAP:
1021 case GIO_UNIMAP:
1022 ret = do_unimap_ioctl(cmd, up, perm, vc);
1023 break;
1024
1025 case VT_LOCKSWITCH:
1026 if (!capable(CAP_SYS_TTY_CONFIG))
1027 return -EPERM;
1028 vt_dont_switch = 1;
1029 break;
1030 case VT_UNLOCKSWITCH:
1031 if (!capable(CAP_SYS_TTY_CONFIG))
1032 return -EPERM;
1033 vt_dont_switch = 0;
1034 break;
1035 case VT_GETHIFONTMASK:
1036 ret = put_user(vc->vc_hi_font_mask,
1037 (unsigned short __user *)arg);
1038 break;
1039 case VT_WAITEVENT:
1040 ret = vt_event_wait_ioctl((struct vt_event __user *)arg);
1041 break;
1042 default:
1043 ret = -ENOIOCTLCMD;
1044 }
1045out:
1046 return ret;
1047}
1048
1049void reset_vc(struct vc_data *vc)
1050{
1051 vc->vc_mode = KD_TEXT;
1052 vt_reset_unicode(vc->vc_num);
1053 vc->vt_mode.mode = VT_AUTO;
1054 vc->vt_mode.waitv = 0;
1055 vc->vt_mode.relsig = 0;
1056 vc->vt_mode.acqsig = 0;
1057 vc->vt_mode.frsig = 0;
1058 put_pid(vc->vt_pid);
1059 vc->vt_pid = NULL;
1060 vc->vt_newvt = -1;
1061 if (!in_interrupt()) /* Via keyboard.c:SAK() - akpm */
1062 reset_palette(vc);
1063}
1064
1065void vc_SAK(struct work_struct *work)
1066{
1067 struct vc *vc_con =
1068 container_of(work, struct vc, SAK_work);
1069 struct vc_data *vc;
1070 struct tty_struct *tty;
1071
1072 console_lock();
1073 vc = vc_con->d;
1074 if (vc) {
1075 /* FIXME: review tty ref counting */
1076 tty = vc->port.tty;
1077 /*
1078 * SAK should also work in all raw modes and reset
1079 * them properly.
1080 */
1081 if (tty)
1082 __do_SAK(tty);
1083 reset_vc(vc);
1084 }
1085 console_unlock();
1086}
1087
1088#ifdef CONFIG_COMPAT
1089
1090struct compat_consolefontdesc {
1091 unsigned short charcount; /* characters in font (256 or 512) */
1092 unsigned short charheight; /* scan lines per character (1-32) */
1093 compat_caddr_t chardata; /* font data in expanded form */
1094};
1095
1096static inline int
1097compat_fontx_ioctl(int cmd, struct compat_consolefontdesc __user *user_cfd,
1098 int perm, struct console_font_op *op)
1099{
1100 struct compat_consolefontdesc cfdarg;
1101 int i;
1102
1103 if (copy_from_user(&cfdarg, user_cfd, sizeof(struct compat_consolefontdesc)))
1104 return -EFAULT;
1105
1106 switch (cmd) {
1107 case PIO_FONTX:
1108 if (!perm)
1109 return -EPERM;
1110 op->op = KD_FONT_OP_SET;
1111 op->flags = KD_FONT_FLAG_OLD;
1112 op->width = 8;
1113 op->height = cfdarg.charheight;
1114 op->charcount = cfdarg.charcount;
1115 op->data = compat_ptr(cfdarg.chardata);
1116 return con_font_op(vc_cons[fg_console].d, op);
1117 case GIO_FONTX:
1118 op->op = KD_FONT_OP_GET;
1119 op->flags = KD_FONT_FLAG_OLD;
1120 op->width = 8;
1121 op->height = cfdarg.charheight;
1122 op->charcount = cfdarg.charcount;
1123 op->data = compat_ptr(cfdarg.chardata);
1124 i = con_font_op(vc_cons[fg_console].d, op);
1125 if (i)
1126 return i;
1127 cfdarg.charheight = op->height;
1128 cfdarg.charcount = op->charcount;
1129 if (copy_to_user(user_cfd, &cfdarg, sizeof(struct compat_consolefontdesc)))
1130 return -EFAULT;
1131 return 0;
1132 }
1133 return -EINVAL;
1134}
1135
1136struct compat_console_font_op {
1137 compat_uint_t op; /* operation code KD_FONT_OP_* */
1138 compat_uint_t flags; /* KD_FONT_FLAG_* */
1139 compat_uint_t width, height; /* font size */
1140 compat_uint_t charcount;
1141 compat_caddr_t data; /* font data with height fixed to 32 */
1142};
1143
1144static inline int
1145compat_kdfontop_ioctl(struct compat_console_font_op __user *fontop,
1146 int perm, struct console_font_op *op, struct vc_data *vc)
1147{
1148 int i;
1149
1150 if (copy_from_user(op, fontop, sizeof(struct compat_console_font_op)))
1151 return -EFAULT;
1152 if (!perm && op->op != KD_FONT_OP_GET)
1153 return -EPERM;
1154 op->data = compat_ptr(((struct compat_console_font_op *)op)->data);
1155 i = con_font_op(vc, op);
1156 if (i)
1157 return i;
1158 ((struct compat_console_font_op *)op)->data = (unsigned long)op->data;
1159 if (copy_to_user(fontop, op, sizeof(struct compat_console_font_op)))
1160 return -EFAULT;
1161 return 0;
1162}
1163
1164struct compat_unimapdesc {
1165 unsigned short entry_ct;
1166 compat_caddr_t entries;
1167};
1168
1169static inline int
1170compat_unimap_ioctl(unsigned int cmd, struct compat_unimapdesc __user *user_ud,
1171 int perm, struct vc_data *vc)
1172{
1173 struct compat_unimapdesc tmp;
1174 struct unipair __user *tmp_entries;
1175
1176 if (copy_from_user(&tmp, user_ud, sizeof tmp))
1177 return -EFAULT;
1178 tmp_entries = compat_ptr(tmp.entries);
1179 if (tmp_entries)
1180 if (!access_ok(VERIFY_WRITE, tmp_entries,
1181 tmp.entry_ct*sizeof(struct unipair)))
1182 return -EFAULT;
1183 switch (cmd) {
1184 case PIO_UNIMAP:
1185 if (!perm)
1186 return -EPERM;
1187 return con_set_unimap(vc, tmp.entry_ct, tmp_entries);
1188 case GIO_UNIMAP:
1189 if (!perm && fg_console != vc->vc_num)
1190 return -EPERM;
1191 return con_get_unimap(vc, tmp.entry_ct, &(user_ud->entry_ct), tmp_entries);
1192 }
1193 return 0;
1194}
1195
1196long vt_compat_ioctl(struct tty_struct *tty,
1197 unsigned int cmd, unsigned long arg)
1198{
1199 struct vc_data *vc = tty->driver_data;
1200 struct console_font_op op; /* used in multiple places here */
1201 unsigned int console;
1202 void __user *up = (void __user *)arg;
1203 int perm;
1204 int ret = 0;
1205
1206 console = vc->vc_num;
1207
1208 if (!vc_cons_allocated(console)) { /* impossible? */
1209 ret = -ENOIOCTLCMD;
1210 goto out;
1211 }
1212
1213 /*
1214 * To have permissions to do most of the vt ioctls, we either have
1215 * to be the owner of the tty, or have CAP_SYS_TTY_CONFIG.
1216 */
1217 perm = 0;
1218 if (current->signal->tty == tty || capable(CAP_SYS_TTY_CONFIG))
1219 perm = 1;
1220
1221 switch (cmd) {
1222 /*
1223 * these need special handlers for incompatible data structures
1224 */
1225 case PIO_FONTX:
1226 case GIO_FONTX:
1227 ret = compat_fontx_ioctl(cmd, up, perm, &op);
1228 break;
1229
1230 case KDFONTOP:
1231 ret = compat_kdfontop_ioctl(up, perm, &op, vc);
1232 break;
1233
1234 case PIO_UNIMAP:
1235 case GIO_UNIMAP:
1236 ret = compat_unimap_ioctl(cmd, up, perm, vc);
1237 break;
1238
1239 /*
1240 * all these treat 'arg' as an integer
1241 */
1242 case KIOCSOUND:
1243 case KDMKTONE:
1244#ifdef CONFIG_X86
1245 case KDADDIO:
1246 case KDDELIO:
1247#endif
1248 case KDSETMODE:
1249 case KDMAPDISP:
1250 case KDUNMAPDISP:
1251 case KDSKBMODE:
1252 case KDSKBMETA:
1253 case KDSKBLED:
1254 case KDSETLED:
1255 case KDSIGACCEPT:
1256 case VT_ACTIVATE:
1257 case VT_WAITACTIVE:
1258 case VT_RELDISP:
1259 case VT_DISALLOCATE:
1260 case VT_RESIZE:
1261 case VT_RESIZEX:
1262 goto fallback;
1263
1264 /*
1265 * the rest has a compatible data structure behind arg,
1266 * but we have to convert it to a proper 64 bit pointer.
1267 */
1268 default:
1269 arg = (unsigned long)compat_ptr(arg);
1270 goto fallback;
1271 }
1272out:
1273 return ret;
1274
1275fallback:
1276 return vt_ioctl(tty, cmd, arg);
1277}
1278
1279
1280#endif /* CONFIG_COMPAT */
1281
1282
1283/*
1284 * Performs the back end of a vt switch. Called under the console
1285 * semaphore.
1286 */
1287static void complete_change_console(struct vc_data *vc)
1288{
1289 unsigned char old_vc_mode;
1290 int old = fg_console;
1291
1292 last_console = fg_console;
1293
1294 /*
1295 * If we're switching, we could be going from KD_GRAPHICS to
1296 * KD_TEXT mode or vice versa, which means we need to blank or
1297 * unblank the screen later.
1298 */
1299 old_vc_mode = vc_cons[fg_console].d->vc_mode;
1300 switch_screen(vc);
1301
1302 /*
1303 * This can't appear below a successful kill_pid(). If it did,
1304 * then the *blank_screen operation could occur while X, having
1305 * received acqsig, is waking up on another processor. This
1306 * condition can lead to overlapping accesses to the VGA range
1307 * and the framebuffer (causing system lockups).
1308 *
1309 * To account for this we duplicate this code below only if the
1310 * controlling process is gone and we've called reset_vc.
1311 */
1312 if (old_vc_mode != vc->vc_mode) {
1313 if (vc->vc_mode == KD_TEXT)
1314 do_unblank_screen(1);
1315 else
1316 do_blank_screen(1);
1317 }
1318
1319 /*
1320 * If this new console is under process control, send it a signal
1321 * telling it that it has acquired. Also check if it has died and
1322 * clean up (similar to logic employed in change_console())
1323 */
1324 if (vc->vt_mode.mode == VT_PROCESS) {
1325 /*
1326 * Send the signal as privileged - kill_pid() will
1327 * tell us if the process has gone or something else
1328 * is awry
1329 */
1330 if (kill_pid(vc->vt_pid, vc->vt_mode.acqsig, 1) != 0) {
1331 /*
1332 * The controlling process has died, so we revert back to
1333 * normal operation. In this case, we'll also change back
1334 * to KD_TEXT mode. I'm not sure if this is strictly correct
1335 * but it saves the agony when the X server dies and the screen
1336 * remains blanked due to KD_GRAPHICS! It would be nice to do
1337 * this outside of VT_PROCESS but there is no single process
1338 * to account for and tracking tty count may be undesirable.
1339 */
1340 reset_vc(vc);
1341
1342 if (old_vc_mode != vc->vc_mode) {
1343 if (vc->vc_mode == KD_TEXT)
1344 do_unblank_screen(1);
1345 else
1346 do_blank_screen(1);
1347 }
1348 }
1349 }
1350
1351 /*
1352 * Wake anyone waiting for their VT to activate
1353 */
1354 vt_event_post(VT_EVENT_SWITCH, old, vc->vc_num);
1355 return;
1356}
1357
1358/*
1359 * Performs the front-end of a vt switch
1360 */
1361void change_console(struct vc_data *new_vc)
1362{
1363 struct vc_data *vc;
1364
1365 if (!new_vc || new_vc->vc_num == fg_console || vt_dont_switch)
1366 return;
1367
1368 /*
1369 * If this vt is in process mode, then we need to handshake with
1370 * that process before switching. Essentially, we store where that
1371 * vt wants to switch to and wait for it to tell us when it's done
1372 * (via VT_RELDISP ioctl).
1373 *
1374 * We also check to see if the controlling process still exists.
1375 * If it doesn't, we reset this vt to auto mode and continue.
1376 * This is a cheap way to track process control. The worst thing
1377 * that can happen is: we send a signal to a process, it dies, and
1378 * the switch gets "lost" waiting for a response; hopefully, the
1379 * user will try again, we'll detect the process is gone (unless
1380 * the user waits just the right amount of time :-) and revert the
1381 * vt to auto control.
1382 */
1383 vc = vc_cons[fg_console].d;
1384 if (vc->vt_mode.mode == VT_PROCESS) {
1385 /*
1386 * Send the signal as privileged - kill_pid() will
1387 * tell us if the process has gone or something else
1388 * is awry.
1389 *
1390 * We need to set vt_newvt *before* sending the signal or we
1391 * have a race.
1392 */
1393 vc->vt_newvt = new_vc->vc_num;
1394 if (kill_pid(vc->vt_pid, vc->vt_mode.relsig, 1) == 0) {
1395 /*
1396 * It worked. Mark the vt to switch to and
1397 * return. The process needs to send us a
1398 * VT_RELDISP ioctl to complete the switch.
1399 */
1400 return;
1401 }
1402
1403 /*
1404 * The controlling process has died, so we revert back to
1405 * normal operation. In this case, we'll also change back
1406 * to KD_TEXT mode. I'm not sure if this is strictly correct
1407 * but it saves the agony when the X server dies and the screen
1408 * remains blanked due to KD_GRAPHICS! It would be nice to do
1409 * this outside of VT_PROCESS but there is no single process
1410 * to account for and tracking tty count may be undesirable.
1411 */
1412 reset_vc(vc);
1413
1414 /*
1415 * Fall through to normal (VT_AUTO) handling of the switch...
1416 */
1417 }
1418
1419 /*
1420 * Ignore all switches in KD_GRAPHICS+VT_AUTO mode
1421 */
1422 if (vc->vc_mode == KD_GRAPHICS)
1423 return;
1424
1425 complete_change_console(new_vc);
1426}
1427
1428/* Perform a kernel triggered VT switch for suspend/resume */
1429
1430static int disable_vt_switch;
1431
1432int vt_move_to_console(unsigned int vt, int alloc)
1433{
1434 int prev;
1435
1436 console_lock();
1437 /* Graphics mode - up to X */
1438 if (disable_vt_switch) {
1439 console_unlock();
1440 return 0;
1441 }
1442 prev = fg_console;
1443
1444 if (alloc && vc_allocate(vt)) {
1445 /* we can't have a free VC for now. Too bad,
1446 * we don't want to mess the screen for now. */
1447 console_unlock();
1448 return -ENOSPC;
1449 }
1450
1451 if (set_console(vt)) {
1452 /*
1453 * We're unable to switch to the SUSPEND_CONSOLE.
1454 * Let the calling function know so it can decide
1455 * what to do.
1456 */
1457 console_unlock();
1458 return -EIO;
1459 }
1460 console_unlock();
1461 if (vt_waitactive(vt + 1)) {
1462 pr_debug("Suspend: Can't switch VCs.");
1463 return -EINTR;
1464 }
1465 return prev;
1466}
1467
1468/*
1469 * Normally during a suspend, we allocate a new console and switch to it.
1470 * When we resume, we switch back to the original console. This switch
1471 * can be slow, so on systems where the framebuffer can handle restoration
1472 * of video registers anyways, there's little point in doing the console
1473 * switch. This function allows you to disable it by passing it '0'.
1474 */
1475void pm_set_vt_switch(int do_switch)
1476{
1477 console_lock();
1478 disable_vt_switch = !do_switch;
1479 console_unlock();
1480}
1481EXPORT_SYMBOL(pm_set_vt_switch);