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