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OMAPDSS: VENC: fix NULL pointer dereference in DSS2 VENC sysfs debug attr on OMAP4
[zen-stable.git] / drivers / tty / vt / vt_ioctl.c
blob65447c5f91d7e0c1108d5f4db5d6eaf69af53234
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
38 char vt_dont_switch;
39 extern 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
61 static void complete_change_console(struct vc_data *vc);
62
63 /*
64 * User space VT_EVENT handlers
65 */
66
67 struct vt_event_wait {
68 struct list_head list;
69 struct vt_event event;
70 int done;
71 };
72
73 static LIST_HEAD(vt_events);
74 static DEFINE_SPINLOCK(vt_event_lock);
75 static 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
86 void 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
122 static 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_tty(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
147 static 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
176 int 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 #define i (tmp.kb_index)
199 #define s (tmp.kb_table)
200 #define v (tmp.kb_value)
201 static inline int
202 do_kdsk_ioctl(int cmd, struct kbentry __user *user_kbe, int perm, struct kbd_struct *kbd)
203 {
204 struct kbentry tmp;
205 ushort *key_map, val, ov;
206
207 if (copy_from_user(&tmp, user_kbe, sizeof(struct kbentry)))
208 return -EFAULT;
209
210 if (!capable(CAP_SYS_TTY_CONFIG))
211 perm = 0;
212
213 switch (cmd) {
214 case KDGKBENT:
215 key_map = key_maps[s];
216 if (key_map) {
217 val = U(key_map[i]);
218 if (kbd->kbdmode != VC_UNICODE && KTYP(val) >= NR_TYPES)
219 val = K_HOLE;
220 } else
221 val = (i ? K_HOLE : K_NOSUCHMAP);
222 return put_user(val, &user_kbe->kb_value);
223 case KDSKBENT:
224 if (!perm)
225 return -EPERM;
226 if (!i && v == K_NOSUCHMAP) {
227 /* deallocate map */
228 key_map = key_maps[s];
229 if (s && key_map) {
230 key_maps[s] = NULL;
231 if (key_map[0] == U(K_ALLOCATED)) {
232 kfree(key_map);
233 keymap_count--;
234 }
235 }
236 break;
237 }
238
239 if (KTYP(v) < NR_TYPES) {
240 if (KVAL(v) > max_vals[KTYP(v)])
241 return -EINVAL;
242 } else
243 if (kbd->kbdmode != VC_UNICODE)
244 return -EINVAL;
245
246 /* ++Geert: non-PC keyboards may generate keycode zero */
247 #if !defined(__mc68000__) && !defined(__powerpc__)
248 /* assignment to entry 0 only tests validity of args */
249 if (!i)
250 break;
251 #endif
252
253 if (!(key_map = key_maps[s])) {
254 int j;
255
256 if (keymap_count >= MAX_NR_OF_USER_KEYMAPS &&
257 !capable(CAP_SYS_RESOURCE))
258 return -EPERM;
259
260 key_map = kmalloc(sizeof(plain_map),
261 GFP_KERNEL);
262 if (!key_map)
263 return -ENOMEM;
264 key_maps[s] = key_map;
265 key_map[0] = U(K_ALLOCATED);
266 for (j = 1; j < NR_KEYS; j++)
267 key_map[j] = U(K_HOLE);
268 keymap_count++;
269 }
270 ov = U(key_map[i]);
271 if (v == ov)
272 break; /* nothing to do */
273 /*
274 * Attention Key.
275 */
276 if (((ov == K_SAK) || (v == K_SAK)) && !capable(CAP_SYS_ADMIN))
277 return -EPERM;
278 key_map[i] = U(v);
279 if (!s && (KTYP(ov) == KT_SHIFT || KTYP(v) == KT_SHIFT))
280 compute_shiftstate();
281 break;
282 }
283 return 0;
284 }
285 #undef i
286 #undef s
287 #undef v
288
289 static inline int
290 do_kbkeycode_ioctl(int cmd, struct kbkeycode __user *user_kbkc, int perm)
291 {
292 struct kbkeycode tmp;
293 int kc = 0;
294
295 if (copy_from_user(&tmp, user_kbkc, sizeof(struct kbkeycode)))
296 return -EFAULT;
297 switch (cmd) {
298 case KDGETKEYCODE:
299 kc = getkeycode(tmp.scancode);
300 if (kc >= 0)
301 kc = put_user(kc, &user_kbkc->keycode);
302 break;
303 case KDSETKEYCODE:
304 if (!perm)
305 return -EPERM;
306 kc = setkeycode(tmp.scancode, tmp.keycode);
307 break;
308 }
309 return kc;
310 }
311
312 static inline int
313 do_kdgkb_ioctl(int cmd, struct kbsentry __user *user_kdgkb, int perm)
314 {
315 struct kbsentry *kbs;
316 char *p;
317 u_char *q;
318 u_char __user *up;
319 int sz;
320 int delta;
321 char *first_free, *fj, *fnw;
322 int i, j, k;
323 int ret;
324
325 if (!capable(CAP_SYS_TTY_CONFIG))
326 perm = 0;
327
328 kbs = kmalloc(sizeof(*kbs), GFP_KERNEL);
329 if (!kbs) {
330 ret = -ENOMEM;
331 goto reterr;
332 }
333
334 /* we mostly copy too much here (512bytes), but who cares ;) */
335 if (copy_from_user(kbs, user_kdgkb, sizeof(struct kbsentry))) {
336 ret = -EFAULT;
337 goto reterr;
338 }
339 kbs->kb_string[sizeof(kbs->kb_string)-1] = '\0';
340 i = kbs->kb_func;
341
342 switch (cmd) {
343 case KDGKBSENT:
344 sz = sizeof(kbs->kb_string) - 1; /* sz should have been
345 a struct member */
346 up = user_kdgkb->kb_string;
347 p = func_table[i];
348 if(p)
349 for ( ; *p && sz; p++, sz--)
350 if (put_user(*p, up++)) {
351 ret = -EFAULT;
352 goto reterr;
353 }
354 if (put_user('\0', up)) {
355 ret = -EFAULT;
356 goto reterr;
357 }
358 kfree(kbs);
359 return ((p && *p) ? -EOVERFLOW : 0);
360 case KDSKBSENT:
361 if (!perm) {
362 ret = -EPERM;
363 goto reterr;
364 }
365
366 q = func_table[i];
367 first_free = funcbufptr + (funcbufsize - funcbufleft);
368 for (j = i+1; j < MAX_NR_FUNC && !func_table[j]; j++)
369 ;
370 if (j < MAX_NR_FUNC)
371 fj = func_table[j];
372 else
373 fj = first_free;
374
375 delta = (q ? -strlen(q) : 1) + strlen(kbs->kb_string);
376 if (delta <= funcbufleft) { /* it fits in current buf */
377 if (j < MAX_NR_FUNC) {
378 memmove(fj + delta, fj, first_free - fj);
379 for (k = j; k < MAX_NR_FUNC; k++)
380 if (func_table[k])
381 func_table[k] += delta;
382 }
383 if (!q)
384 func_table[i] = fj;
385 funcbufleft -= delta;
386 } else { /* allocate a larger buffer */
387 sz = 256;
388 while (sz < funcbufsize - funcbufleft + delta)
389 sz <<= 1;
390 fnw = kmalloc(sz, GFP_KERNEL);
391 if(!fnw) {
392 ret = -ENOMEM;
393 goto reterr;
394 }
395
396 if (!q)
397 func_table[i] = fj;
398 if (fj > funcbufptr)
399 memmove(fnw, funcbufptr, fj - funcbufptr);
400 for (k = 0; k < j; k++)
401 if (func_table[k])
402 func_table[k] = fnw + (func_table[k] - funcbufptr);
403
404 if (first_free > fj) {
405 memmove(fnw + (fj - funcbufptr) + delta, fj, first_free - fj);
406 for (k = j; k < MAX_NR_FUNC; k++)
407 if (func_table[k])
408 func_table[k] = fnw + (func_table[k] - funcbufptr) + delta;
409 }
410 if (funcbufptr != func_buf)
411 kfree(funcbufptr);
412 funcbufptr = fnw;
413 funcbufleft = funcbufleft - delta + sz - funcbufsize;
414 funcbufsize = sz;
415 }
416 strcpy(func_table[i], kbs->kb_string);
417 break;
418 }
419 ret = 0;
420 reterr:
421 kfree(kbs);
422 return ret;
423 }
424
425 static inline int
426 do_fontx_ioctl(int cmd, struct consolefontdesc __user *user_cfd, int perm, struct console_font_op *op)
427 {
428 struct consolefontdesc cfdarg;
429 int i;
430
431 if (copy_from_user(&cfdarg, user_cfd, sizeof(struct consolefontdesc)))
432 return -EFAULT;
433
434 switch (cmd) {
435 case PIO_FONTX:
436 if (!perm)
437 return -EPERM;
438 op->op = KD_FONT_OP_SET;
439 op->flags = KD_FONT_FLAG_OLD;
440 op->width = 8;
441 op->height = cfdarg.charheight;
442 op->charcount = cfdarg.charcount;
443 op->data = cfdarg.chardata;
444 return con_font_op(vc_cons[fg_console].d, op);
445 case GIO_FONTX: {
446 op->op = KD_FONT_OP_GET;
447 op->flags = KD_FONT_FLAG_OLD;
448 op->width = 8;
449 op->height = cfdarg.charheight;
450 op->charcount = cfdarg.charcount;
451 op->data = cfdarg.chardata;
452 i = con_font_op(vc_cons[fg_console].d, op);
453 if (i)
454 return i;
455 cfdarg.charheight = op->height;
456 cfdarg.charcount = op->charcount;
457 if (copy_to_user(user_cfd, &cfdarg, sizeof(struct consolefontdesc)))
458 return -EFAULT;
459 return 0;
460 }
461 }
462 return -EINVAL;
463 }
464
465 static inline int
466 do_unimap_ioctl(int cmd, struct unimapdesc __user *user_ud, int perm, struct vc_data *vc)
467 {
468 struct unimapdesc tmp;
469
470 if (copy_from_user(&tmp, user_ud, sizeof tmp))
471 return -EFAULT;
472 if (tmp.entries)
473 if (!access_ok(VERIFY_WRITE, tmp.entries,
474 tmp.entry_ct*sizeof(struct unipair)))
475 return -EFAULT;
476 switch (cmd) {
477 case PIO_UNIMAP:
478 if (!perm)
479 return -EPERM;
480 return con_set_unimap(vc, tmp.entry_ct, tmp.entries);
481 case GIO_UNIMAP:
482 if (!perm && fg_console != vc->vc_num)
483 return -EPERM;
484 return con_get_unimap(vc, tmp.entry_ct, &(user_ud->entry_ct), tmp.entries);
485 }
486 return 0;
487 }
488
489
490
491 /*
492 * We handle the console-specific ioctl's here. We allow the
493 * capability to modify any console, not just the fg_console.
494 */
495 int vt_ioctl(struct tty_struct *tty,
496 unsigned int cmd, unsigned long arg)
497 {
498 struct vc_data *vc = tty->driver_data;
499 struct console_font_op op; /* used in multiple places here */
500 struct kbd_struct * kbd;
501 unsigned int console;
502 unsigned char ucval;
503 unsigned int uival;
504 void __user *up = (void __user *)arg;
505 int i, perm;
506 int ret = 0;
507
508 console = vc->vc_num;
509
510 tty_lock();
511
512 if (!vc_cons_allocated(console)) { /* impossible? */
513 ret = -ENOIOCTLCMD;
514 goto out;
515 }
516
517
518 /*
519 * To have permissions to do most of the vt ioctls, we either have
520 * to be the owner of the tty, or have CAP_SYS_TTY_CONFIG.
521 */
522 perm = 0;
523 if (current->signal->tty == tty || capable(CAP_SYS_TTY_CONFIG))
524 perm = 1;
525
526 kbd = kbd_table + console;
527 switch (cmd) {
528 case TIOCLINUX:
529 ret = tioclinux(tty, arg);
530 break;
531 case KIOCSOUND:
532 if (!perm)
533 goto eperm;
534 /*
535 * The use of PIT_TICK_RATE is historic, it used to be
536 * the platform-dependent CLOCK_TICK_RATE between 2.6.12
537 * and 2.6.36, which was a minor but unfortunate ABI
538 * change.
539 */
540 if (arg)
541 arg = PIT_TICK_RATE / arg;
542 kd_mksound(arg, 0);
543 break;
544
545 case KDMKTONE:
546 if (!perm)
547 goto eperm;
548 {
549 unsigned int ticks, count;
550
551 /*
552 * Generate the tone for the appropriate number of ticks.
553 * If the time is zero, turn off sound ourselves.
554 */
555 ticks = HZ * ((arg >> 16) & 0xffff) / 1000;
556 count = ticks ? (arg & 0xffff) : 0;
557 if (count)
558 count = PIT_TICK_RATE / count;
559 kd_mksound(count, ticks);
560 break;
561 }
562
563 case KDGKBTYPE:
564 /*
565 * this is naive.
566 */
567 ucval = KB_101;
568 goto setchar;
569
570 /*
571 * These cannot be implemented on any machine that implements
572 * ioperm() in user level (such as Alpha PCs) or not at all.
573 *
574 * XXX: you should never use these, just call ioperm directly..
575 */
576 #ifdef CONFIG_X86
577 case KDADDIO:
578 case KDDELIO:
579 /*
580 * KDADDIO and KDDELIO may be able to add ports beyond what
581 * we reject here, but to be safe...
582 */
583 if (arg < GPFIRST || arg > GPLAST) {
584 ret = -EINVAL;
585 break;
586 }
587 ret = sys_ioperm(arg, 1, (cmd == KDADDIO)) ? -ENXIO : 0;
588 break;
589
590 case KDENABIO:
591 case KDDISABIO:
592 ret = sys_ioperm(GPFIRST, GPNUM,
593 (cmd == KDENABIO)) ? -ENXIO : 0;
594 break;
595 #endif
596
597 /* Linux m68k/i386 interface for setting the keyboard delay/repeat rate */
598
599 case KDKBDREP:
600 {
601 struct kbd_repeat kbrep;
602
603 if (!capable(CAP_SYS_TTY_CONFIG))
604 goto eperm;
605
606 if (copy_from_user(&kbrep, up, sizeof(struct kbd_repeat))) {
607 ret = -EFAULT;
608 break;
609 }
610 ret = kbd_rate(&kbrep);
611 if (ret)
612 break;
613 if (copy_to_user(up, &kbrep, sizeof(struct kbd_repeat)))
614 ret = -EFAULT;
615 break;
616 }
617
618 case KDSETMODE:
619 /*
620 * currently, setting the mode from KD_TEXT to KD_GRAPHICS
621 * doesn't do a whole lot. i'm not sure if it should do any
622 * restoration of modes or what...
623 *
624 * XXX It should at least call into the driver, fbdev's definitely
625 * need to restore their engine state. --BenH
626 */
627 if (!perm)
628 goto eperm;
629 switch (arg) {
630 case KD_GRAPHICS:
631 break;
632 case KD_TEXT0:
633 case KD_TEXT1:
634 arg = KD_TEXT;
635 case KD_TEXT:
636 break;
637 default:
638 ret = -EINVAL;
639 goto out;
640 }
641 if (vc->vc_mode == (unsigned char) arg)
642 break;
643 vc->vc_mode = (unsigned char) arg;
644 if (console != fg_console)
645 break;
646 /*
647 * explicitly blank/unblank the screen if switching modes
648 */
649 console_lock();
650 if (arg == KD_TEXT)
651 do_unblank_screen(1);
652 else
653 do_blank_screen(1);
654 console_unlock();
655 break;
656
657 case KDGETMODE:
658 uival = vc->vc_mode;
659 goto setint;
660
661 case KDMAPDISP:
662 case KDUNMAPDISP:
663 /*
664 * these work like a combination of mmap and KDENABIO.
665 * this could be easily finished.
666 */
667 ret = -EINVAL;
668 break;
669
670 case KDSKBMODE:
671 if (!perm)
672 goto eperm;
673 switch(arg) {
674 case K_RAW:
675 kbd->kbdmode = VC_RAW;
676 break;
677 case K_MEDIUMRAW:
678 kbd->kbdmode = VC_MEDIUMRAW;
679 break;
680 case K_XLATE:
681 kbd->kbdmode = VC_XLATE;
682 compute_shiftstate();
683 break;
684 case K_UNICODE:
685 kbd->kbdmode = VC_UNICODE;
686 compute_shiftstate();
687 break;
688 case K_OFF:
689 kbd->kbdmode = VC_OFF;
690 break;
691 default:
692 ret = -EINVAL;
693 goto out;
694 }
695 tty_ldisc_flush(tty);
696 break;
697
698 case KDGKBMODE:
699 switch (kbd->kbdmode) {
700 case VC_RAW:
701 uival = K_RAW;
702 break;
703 case VC_MEDIUMRAW:
704 uival = K_MEDIUMRAW;
705 break;
706 case VC_UNICODE:
707 uival = K_UNICODE;
708 break;
709 case VC_OFF:
710 uival = K_OFF;
711 break;
712 default:
713 uival = K_XLATE;
714 break;
715 }
716 goto setint;
717
718 /* this could be folded into KDSKBMODE, but for compatibility
719 reasons it is not so easy to fold KDGKBMETA into KDGKBMODE */
720 case KDSKBMETA:
721 switch(arg) {
722 case K_METABIT:
723 clr_vc_kbd_mode(kbd, VC_META);
724 break;
725 case K_ESCPREFIX:
726 set_vc_kbd_mode(kbd, VC_META);
727 break;
728 default:
729 ret = -EINVAL;
730 }
731 break;
732
733 case KDGKBMETA:
734 uival = (vc_kbd_mode(kbd, VC_META) ? K_ESCPREFIX : K_METABIT);
735 setint:
736 ret = put_user(uival, (int __user *)arg);
737 break;
738
739 case KDGETKEYCODE:
740 case KDSETKEYCODE:
741 if(!capable(CAP_SYS_TTY_CONFIG))
742 perm = 0;
743 ret = do_kbkeycode_ioctl(cmd, up, perm);
744 break;
745
746 case KDGKBENT:
747 case KDSKBENT:
748 ret = do_kdsk_ioctl(cmd, up, perm, kbd);
749 break;
750
751 case KDGKBSENT:
752 case KDSKBSENT:
753 ret = do_kdgkb_ioctl(cmd, up, perm);
754 break;
755
756 case KDGKBDIACR:
757 {
758 struct kbdiacrs __user *a = up;
759 struct kbdiacr diacr;
760 int i;
761
762 if (put_user(accent_table_size, &a->kb_cnt)) {
763 ret = -EFAULT;
764 break;
765 }
766 for (i = 0; i < accent_table_size; i++) {
767 diacr.diacr = conv_uni_to_8bit(accent_table[i].diacr);
768 diacr.base = conv_uni_to_8bit(accent_table[i].base);
769 diacr.result = conv_uni_to_8bit(accent_table[i].result);
770 if (copy_to_user(a->kbdiacr + i, &diacr, sizeof(struct kbdiacr))) {
771 ret = -EFAULT;
772 break;
773 }
774 }
775 break;
776 }
777 case KDGKBDIACRUC:
778 {
779 struct kbdiacrsuc __user *a = up;
780
781 if (put_user(accent_table_size, &a->kb_cnt))
782 ret = -EFAULT;
783 else if (copy_to_user(a->kbdiacruc, accent_table,
784 accent_table_size*sizeof(struct kbdiacruc)))
785 ret = -EFAULT;
786 break;
787 }
788
789 case KDSKBDIACR:
790 {
791 struct kbdiacrs __user *a = up;
792 struct kbdiacr diacr;
793 unsigned int ct;
794 int i;
795
796 if (!perm)
797 goto eperm;
798 if (get_user(ct,&a->kb_cnt)) {
799 ret = -EFAULT;
800 break;
801 }
802 if (ct >= MAX_DIACR) {
803 ret = -EINVAL;
804 break;
805 }
806 accent_table_size = ct;
807 for (i = 0; i < ct; i++) {
808 if (copy_from_user(&diacr, a->kbdiacr + i, sizeof(struct kbdiacr))) {
809 ret = -EFAULT;
810 break;
811 }
812 accent_table[i].diacr = conv_8bit_to_uni(diacr.diacr);
813 accent_table[i].base = conv_8bit_to_uni(diacr.base);
814 accent_table[i].result = conv_8bit_to_uni(diacr.result);
815 }
816 break;
817 }
818
819 case KDSKBDIACRUC:
820 {
821 struct kbdiacrsuc __user *a = up;
822 unsigned int ct;
823
824 if (!perm)
825 goto eperm;
826 if (get_user(ct,&a->kb_cnt)) {
827 ret = -EFAULT;
828 break;
829 }
830 if (ct >= MAX_DIACR) {
831 ret = -EINVAL;
832 break;
833 }
834 accent_table_size = ct;
835 if (copy_from_user(accent_table, a->kbdiacruc, ct*sizeof(struct kbdiacruc)))
836 ret = -EFAULT;
837 break;
838 }
839
840 /* the ioctls below read/set the flags usually shown in the leds */
841 /* don't use them - they will go away without warning */
842 case KDGKBLED:
843 ucval = kbd->ledflagstate | (kbd->default_ledflagstate << 4);
844 goto setchar;
845
846 case KDSKBLED:
847 if (!perm)
848 goto eperm;
849 if (arg & ~0x77) {
850 ret = -EINVAL;
851 break;
852 }
853 kbd->ledflagstate = (arg & 7);
854 kbd->default_ledflagstate = ((arg >> 4) & 7);
855 set_leds();
856 break;
857
858 /* the ioctls below only set the lights, not the functions */
859 /* for those, see KDGKBLED and KDSKBLED above */
860 case KDGETLED:
861 ucval = getledstate();
862 setchar:
863 ret = put_user(ucval, (char __user *)arg);
864 break;
865
866 case KDSETLED:
867 if (!perm)
868 goto eperm;
869 setledstate(kbd, arg);
870 break;
871
872 /*
873 * A process can indicate its willingness to accept signals
874 * generated by pressing an appropriate key combination.
875 * Thus, one can have a daemon that e.g. spawns a new console
876 * upon a keypress and then changes to it.
877 * See also the kbrequest field of inittab(5).
878 */
879 case KDSIGACCEPT:
880 {
881 if (!perm || !capable(CAP_KILL))
882 goto eperm;
883 if (!valid_signal(arg) || arg < 1 || arg == SIGKILL)
884 ret = -EINVAL;
885 else {
886 spin_lock_irq(&vt_spawn_con.lock);
887 put_pid(vt_spawn_con.pid);
888 vt_spawn_con.pid = get_pid(task_pid(current));
889 vt_spawn_con.sig = arg;
890 spin_unlock_irq(&vt_spawn_con.lock);
891 }
892 break;
893 }
894
895 case VT_SETMODE:
896 {
897 struct vt_mode tmp;
898
899 if (!perm)
900 goto eperm;
901 if (copy_from_user(&tmp, up, sizeof(struct vt_mode))) {
902 ret = -EFAULT;
903 goto out;
904 }
905 if (tmp.mode != VT_AUTO && tmp.mode != VT_PROCESS) {
906 ret = -EINVAL;
907 goto out;
908 }
909 console_lock();
910 vc->vt_mode = tmp;
911 /* the frsig is ignored, so we set it to 0 */
912 vc->vt_mode.frsig = 0;
913 put_pid(vc->vt_pid);
914 vc->vt_pid = get_pid(task_pid(current));
915 /* no switch is required -- saw@shade.msu.ru */
916 vc->vt_newvt = -1;
917 console_unlock();
918 break;
919 }
920
921 case VT_GETMODE:
922 {
923 struct vt_mode tmp;
924 int rc;
925
926 console_lock();
927 memcpy(&tmp, &vc->vt_mode, sizeof(struct vt_mode));
928 console_unlock();
929
930 rc = copy_to_user(up, &tmp, sizeof(struct vt_mode));
931 if (rc)
932 ret = -EFAULT;
933 break;
934 }
935
936 /*
937 * Returns global vt state. Note that VT 0 is always open, since
938 * it's an alias for the current VT, and people can't use it here.
939 * We cannot return state for more than 16 VTs, since v_state is short.
940 */
941 case VT_GETSTATE:
942 {
943 struct vt_stat __user *vtstat = up;
944 unsigned short state, mask;
945
946 if (put_user(fg_console + 1, &vtstat->v_active))
947 ret = -EFAULT;
948 else {
949 state = 1; /* /dev/tty0 is always open */
950 for (i = 0, mask = 2; i < MAX_NR_CONSOLES && mask;
951 ++i, mask <<= 1)
952 if (VT_IS_IN_USE(i))
953 state |= mask;
954 ret = put_user(state, &vtstat->v_state);
955 }
956 break;
957 }
958
959 /*
960 * Returns the first available (non-opened) console.
961 */
962 case VT_OPENQRY:
963 for (i = 0; i < MAX_NR_CONSOLES; ++i)
964 if (! VT_IS_IN_USE(i))
965 break;
966 uival = i < MAX_NR_CONSOLES ? (i+1) : -1;
967 goto setint;
968
969 /*
970 * ioctl(fd, VT_ACTIVATE, num) will cause us to switch to vt # num,
971 * with num >= 1 (switches to vt 0, our console, are not allowed, just
972 * to preserve sanity).
973 */
974 case VT_ACTIVATE:
975 if (!perm)
976 goto eperm;
977 if (arg == 0 || arg > MAX_NR_CONSOLES)
978 ret = -ENXIO;
979 else {
980 arg--;
981 console_lock();
982 ret = vc_allocate(arg);
983 console_unlock();
984 if (ret)
985 break;
986 set_console(arg);
987 }
988 break;
989
990 case VT_SETACTIVATE:
991 {
992 struct vt_setactivate vsa;
993
994 if (!perm)
995 goto eperm;
996
997 if (copy_from_user(&vsa, (struct vt_setactivate __user *)arg,
998 sizeof(struct vt_setactivate))) {
999 ret = -EFAULT;
1000 goto out;
1001 }
1002 if (vsa.console == 0 || vsa.console > MAX_NR_CONSOLES)
1003 ret = -ENXIO;
1004 else {
1005 vsa.console--;
1006 console_lock();
1007 ret = vc_allocate(vsa.console);
1008 if (ret == 0) {
1009 struct vc_data *nvc;
1010 /* This is safe providing we don't drop the
1011 console sem between vc_allocate and
1012 finishing referencing nvc */
1013 nvc = vc_cons[vsa.console].d;
1014 nvc->vt_mode = vsa.mode;
1015 nvc->vt_mode.frsig = 0;
1016 put_pid(nvc->vt_pid);
1017 nvc->vt_pid = get_pid(task_pid(current));
1018 }
1019 console_unlock();
1020 if (ret)
1021 break;
1022 /* Commence switch and lock */
1023 set_console(vsa.console);
1024 }
1025 break;
1026 }
1027
1028 /*
1029 * wait until the specified VT has been activated
1030 */
1031 case VT_WAITACTIVE:
1032 if (!perm)
1033 goto eperm;
1034 if (arg == 0 || arg > MAX_NR_CONSOLES)
1035 ret = -ENXIO;
1036 else
1037 ret = vt_waitactive(arg);
1038 break;
1039
1040 /*
1041 * If a vt is under process control, the kernel will not switch to it
1042 * immediately, but postpone the operation until the process calls this
1043 * ioctl, allowing the switch to complete.
1044 *
1045 * According to the X sources this is the behavior:
1046 * 0: pending switch-from not OK
1047 * 1: pending switch-from OK
1048 * 2: completed switch-to OK
1049 */
1050 case VT_RELDISP:
1051 if (!perm)
1052 goto eperm;
1053
1054 if (vc->vt_mode.mode != VT_PROCESS) {
1055 ret = -EINVAL;
1056 break;
1057 }
1058 /*
1059 * Switching-from response
1060 */
1061 console_lock();
1062 if (vc->vt_newvt >= 0) {
1063 if (arg == 0)
1064 /*
1065 * Switch disallowed, so forget we were trying
1066 * to do it.
1067 */
1068 vc->vt_newvt = -1;
1069
1070 else {
1071 /*
1072 * The current vt has been released, so
1073 * complete the switch.
1074 */
1075 int newvt;
1076 newvt = vc->vt_newvt;
1077 vc->vt_newvt = -1;
1078 ret = vc_allocate(newvt);
1079 if (ret) {
1080 console_unlock();
1081 break;
1082 }
1083 /*
1084 * When we actually do the console switch,
1085 * make sure we are atomic with respect to
1086 * other console switches..
1087 */
1088 complete_change_console(vc_cons[newvt].d);
1089 }
1090 } else {
1091 /*
1092 * Switched-to response
1093 */
1094 /*
1095 * If it's just an ACK, ignore it
1096 */
1097 if (arg != VT_ACKACQ)
1098 ret = -EINVAL;
1099 }
1100 console_unlock();
1101 break;
1102
1103 /*
1104 * Disallocate memory associated to VT (but leave VT1)
1105 */
1106 case VT_DISALLOCATE:
1107 if (arg > MAX_NR_CONSOLES) {
1108 ret = -ENXIO;
1109 break;
1110 }
1111 if (arg == 0) {
1112 /* deallocate all unused consoles, but leave 0 */
1113 console_lock();
1114 for (i=1; i<MAX_NR_CONSOLES; i++)
1115 if (! VT_BUSY(i))
1116 vc_deallocate(i);
1117 console_unlock();
1118 } else {
1119 /* deallocate a single console, if possible */
1120 arg--;
1121 if (VT_BUSY(arg))
1122 ret = -EBUSY;
1123 else if (arg) { /* leave 0 */
1124 console_lock();
1125 vc_deallocate(arg);
1126 console_unlock();
1127 }
1128 }
1129 break;
1130
1131 case VT_RESIZE:
1132 {
1133 struct vt_sizes __user *vtsizes = up;
1134 struct vc_data *vc;
1135
1136 ushort ll,cc;
1137 if (!perm)
1138 goto eperm;
1139 if (get_user(ll, &vtsizes->v_rows) ||
1140 get_user(cc, &vtsizes->v_cols))
1141 ret = -EFAULT;
1142 else {
1143 console_lock();
1144 for (i = 0; i < MAX_NR_CONSOLES; i++) {
1145 vc = vc_cons[i].d;
1146
1147 if (vc) {
1148 vc->vc_resize_user = 1;
1149 vc_resize(vc_cons[i].d, cc, ll);
1150 }
1151 }
1152 console_unlock();
1153 }
1154 break;
1155 }
1156
1157 case VT_RESIZEX:
1158 {
1159 struct vt_consize __user *vtconsize = up;
1160 ushort ll,cc,vlin,clin,vcol,ccol;
1161 if (!perm)
1162 goto eperm;
1163 if (!access_ok(VERIFY_READ, vtconsize,
1164 sizeof(struct vt_consize))) {
1165 ret = -EFAULT;
1166 break;
1167 }
1168 /* FIXME: Should check the copies properly */
1169 __get_user(ll, &vtconsize->v_rows);
1170 __get_user(cc, &vtconsize->v_cols);
1171 __get_user(vlin, &vtconsize->v_vlin);
1172 __get_user(clin, &vtconsize->v_clin);
1173 __get_user(vcol, &vtconsize->v_vcol);
1174 __get_user(ccol, &vtconsize->v_ccol);
1175 vlin = vlin ? vlin : vc->vc_scan_lines;
1176 if (clin) {
1177 if (ll) {
1178 if (ll != vlin/clin) {
1179 /* Parameters don't add up */
1180 ret = -EINVAL;
1181 break;
1182 }
1183 } else
1184 ll = vlin/clin;
1185 }
1186 if (vcol && ccol) {
1187 if (cc) {
1188 if (cc != vcol/ccol) {
1189 ret = -EINVAL;
1190 break;
1191 }
1192 } else
1193 cc = vcol/ccol;
1194 }
1195
1196 if (clin > 32) {
1197 ret = -EINVAL;
1198 break;
1199 }
1200
1201 for (i = 0; i < MAX_NR_CONSOLES; i++) {
1202 if (!vc_cons[i].d)
1203 continue;
1204 console_lock();
1205 if (vlin)
1206 vc_cons[i].d->vc_scan_lines = vlin;
1207 if (clin)
1208 vc_cons[i].d->vc_font.height = clin;
1209 vc_cons[i].d->vc_resize_user = 1;
1210 vc_resize(vc_cons[i].d, cc, ll);
1211 console_unlock();
1212 }
1213 break;
1214 }
1215
1216 case PIO_FONT: {
1217 if (!perm)
1218 goto eperm;
1219 op.op = KD_FONT_OP_SET;
1220 op.flags = KD_FONT_FLAG_OLD | KD_FONT_FLAG_DONT_RECALC; /* Compatibility */
1221 op.width = 8;
1222 op.height = 0;
1223 op.charcount = 256;
1224 op.data = up;
1225 ret = con_font_op(vc_cons[fg_console].d, &op);
1226 break;
1227 }
1228
1229 case GIO_FONT: {
1230 op.op = KD_FONT_OP_GET;
1231 op.flags = KD_FONT_FLAG_OLD;
1232 op.width = 8;
1233 op.height = 32;
1234 op.charcount = 256;
1235 op.data = up;
1236 ret = con_font_op(vc_cons[fg_console].d, &op);
1237 break;
1238 }
1239
1240 case PIO_CMAP:
1241 if (!perm)
1242 ret = -EPERM;
1243 else
1244 ret = con_set_cmap(up);
1245 break;
1246
1247 case GIO_CMAP:
1248 ret = con_get_cmap(up);
1249 break;
1250
1251 case PIO_FONTX:
1252 case GIO_FONTX:
1253 ret = do_fontx_ioctl(cmd, up, perm, &op);
1254 break;
1255
1256 case PIO_FONTRESET:
1257 {
1258 if (!perm)
1259 goto eperm;
1260
1261 #ifdef BROKEN_GRAPHICS_PROGRAMS
1262 /* With BROKEN_GRAPHICS_PROGRAMS defined, the default
1263 font is not saved. */
1264 ret = -ENOSYS;
1265 break;
1266 #else
1267 {
1268 op.op = KD_FONT_OP_SET_DEFAULT;
1269 op.data = NULL;
1270 ret = con_font_op(vc_cons[fg_console].d, &op);
1271 if (ret)
1272 break;
1273 con_set_default_unimap(vc_cons[fg_console].d);
1274 break;
1275 }
1276 #endif
1277 }
1278
1279 case KDFONTOP: {
1280 if (copy_from_user(&op, up, sizeof(op))) {
1281 ret = -EFAULT;
1282 break;
1283 }
1284 if (!perm && op.op != KD_FONT_OP_GET)
1285 goto eperm;
1286 ret = con_font_op(vc, &op);
1287 if (ret)
1288 break;
1289 if (copy_to_user(up, &op, sizeof(op)))
1290 ret = -EFAULT;
1291 break;
1292 }
1293
1294 case PIO_SCRNMAP:
1295 if (!perm)
1296 ret = -EPERM;
1297 else
1298 ret = con_set_trans_old(up);
1299 break;
1300
1301 case GIO_SCRNMAP:
1302 ret = con_get_trans_old(up);
1303 break;
1304
1305 case PIO_UNISCRNMAP:
1306 if (!perm)
1307 ret = -EPERM;
1308 else
1309 ret = con_set_trans_new(up);
1310 break;
1311
1312 case GIO_UNISCRNMAP:
1313 ret = con_get_trans_new(up);
1314 break;
1315
1316 case PIO_UNIMAPCLR:
1317 { struct unimapinit ui;
1318 if (!perm)
1319 goto eperm;
1320 ret = copy_from_user(&ui, up, sizeof(struct unimapinit));
1321 if (ret)
1322 ret = -EFAULT;
1323 else
1324 con_clear_unimap(vc, &ui);
1325 break;
1326 }
1327
1328 case PIO_UNIMAP:
1329 case GIO_UNIMAP:
1330 ret = do_unimap_ioctl(cmd, up, perm, vc);
1331 break;
1332
1333 case VT_LOCKSWITCH:
1334 if (!capable(CAP_SYS_TTY_CONFIG))
1335 goto eperm;
1336 vt_dont_switch = 1;
1337 break;
1338 case VT_UNLOCKSWITCH:
1339 if (!capable(CAP_SYS_TTY_CONFIG))
1340 goto eperm;
1341 vt_dont_switch = 0;
1342 break;
1343 case VT_GETHIFONTMASK:
1344 ret = put_user(vc->vc_hi_font_mask,
1345 (unsigned short __user *)arg);
1346 break;
1347 case VT_WAITEVENT:
1348 ret = vt_event_wait_ioctl((struct vt_event __user *)arg);
1349 break;
1350 default:
1351 ret = -ENOIOCTLCMD;
1352 }
1353 out:
1354 tty_unlock();
1355 return ret;
1356 eperm:
1357 ret = -EPERM;
1358 goto out;
1359 }
1360
1361 void reset_vc(struct vc_data *vc)
1362 {
1363 vc->vc_mode = KD_TEXT;
1364 kbd_table[vc->vc_num].kbdmode = default_utf8 ? VC_UNICODE : VC_XLATE;
1365 vc->vt_mode.mode = VT_AUTO;
1366 vc->vt_mode.waitv = 0;
1367 vc->vt_mode.relsig = 0;
1368 vc->vt_mode.acqsig = 0;
1369 vc->vt_mode.frsig = 0;
1370 put_pid(vc->vt_pid);
1371 vc->vt_pid = NULL;
1372 vc->vt_newvt = -1;
1373 if (!in_interrupt()) /* Via keyboard.c:SAK() - akpm */
1374 reset_palette(vc);
1375 }
1376
1377 void vc_SAK(struct work_struct *work)
1378 {
1379 struct vc *vc_con =
1380 container_of(work, struct vc, SAK_work);
1381 struct vc_data *vc;
1382 struct tty_struct *tty;
1383
1384 console_lock();
1385 vc = vc_con->d;
1386 if (vc) {
1387 tty = vc->port.tty;
1388 /*
1389 * SAK should also work in all raw modes and reset
1390 * them properly.
1391 */
1392 if (tty)
1393 __do_SAK(tty);
1394 reset_vc(vc);
1395 }
1396 console_unlock();
1397 }
1398
1399 #ifdef CONFIG_COMPAT
1400
1401 struct compat_consolefontdesc {
1402 unsigned short charcount; /* characters in font (256 or 512) */
1403 unsigned short charheight; /* scan lines per character (1-32) */
1404 compat_caddr_t chardata; /* font data in expanded form */
1405 };
1406
1407 static inline int
1408 compat_fontx_ioctl(int cmd, struct compat_consolefontdesc __user *user_cfd,
1409 int perm, struct console_font_op *op)
1410 {
1411 struct compat_consolefontdesc cfdarg;
1412 int i;
1413
1414 if (copy_from_user(&cfdarg, user_cfd, sizeof(struct compat_consolefontdesc)))
1415 return -EFAULT;
1416
1417 switch (cmd) {
1418 case PIO_FONTX:
1419 if (!perm)
1420 return -EPERM;
1421 op->op = KD_FONT_OP_SET;
1422 op->flags = KD_FONT_FLAG_OLD;
1423 op->width = 8;
1424 op->height = cfdarg.charheight;
1425 op->charcount = cfdarg.charcount;
1426 op->data = compat_ptr(cfdarg.chardata);
1427 return con_font_op(vc_cons[fg_console].d, op);
1428 case GIO_FONTX:
1429 op->op = KD_FONT_OP_GET;
1430 op->flags = KD_FONT_FLAG_OLD;
1431 op->width = 8;
1432 op->height = cfdarg.charheight;
1433 op->charcount = cfdarg.charcount;
1434 op->data = compat_ptr(cfdarg.chardata);
1435 i = con_font_op(vc_cons[fg_console].d, op);
1436 if (i)
1437 return i;
1438 cfdarg.charheight = op->height;
1439 cfdarg.charcount = op->charcount;
1440 if (copy_to_user(user_cfd, &cfdarg, sizeof(struct compat_consolefontdesc)))
1441 return -EFAULT;
1442 return 0;
1443 }
1444 return -EINVAL;
1445 }
1446
1447 struct compat_console_font_op {
1448 compat_uint_t op; /* operation code KD_FONT_OP_* */
1449 compat_uint_t flags; /* KD_FONT_FLAG_* */
1450 compat_uint_t width, height; /* font size */
1451 compat_uint_t charcount;
1452 compat_caddr_t data; /* font data with height fixed to 32 */
1453 };
1454
1455 static inline int
1456 compat_kdfontop_ioctl(struct compat_console_font_op __user *fontop,
1457 int perm, struct console_font_op *op, struct vc_data *vc)
1458 {
1459 int i;
1460
1461 if (copy_from_user(op, fontop, sizeof(struct compat_console_font_op)))
1462 return -EFAULT;
1463 if (!perm && op->op != KD_FONT_OP_GET)
1464 return -EPERM;
1465 op->data = compat_ptr(((struct compat_console_font_op *)op)->data);
1466 i = con_font_op(vc, op);
1467 if (i)
1468 return i;
1469 ((struct compat_console_font_op *)op)->data = (unsigned long)op->data;
1470 if (copy_to_user(fontop, op, sizeof(struct compat_console_font_op)))
1471 return -EFAULT;
1472 return 0;
1473 }
1474
1475 struct compat_unimapdesc {
1476 unsigned short entry_ct;
1477 compat_caddr_t entries;
1478 };
1479
1480 static inline int
1481 compat_unimap_ioctl(unsigned int cmd, struct compat_unimapdesc __user *user_ud,
1482 int perm, struct vc_data *vc)
1483 {
1484 struct compat_unimapdesc tmp;
1485 struct unipair __user *tmp_entries;
1486
1487 if (copy_from_user(&tmp, user_ud, sizeof tmp))
1488 return -EFAULT;
1489 tmp_entries = compat_ptr(tmp.entries);
1490 if (tmp_entries)
1491 if (!access_ok(VERIFY_WRITE, tmp_entries,
1492 tmp.entry_ct*sizeof(struct unipair)))
1493 return -EFAULT;
1494 switch (cmd) {
1495 case PIO_UNIMAP:
1496 if (!perm)
1497 return -EPERM;
1498 return con_set_unimap(vc, tmp.entry_ct, tmp_entries);
1499 case GIO_UNIMAP:
1500 if (!perm && fg_console != vc->vc_num)
1501 return -EPERM;
1502 return con_get_unimap(vc, tmp.entry_ct, &(user_ud->entry_ct), tmp_entries);
1503 }
1504 return 0;
1505 }
1506
1507 long vt_compat_ioctl(struct tty_struct *tty,
1508 unsigned int cmd, unsigned long arg)
1509 {
1510 struct vc_data *vc = tty->driver_data;
1511 struct console_font_op op; /* used in multiple places here */
1512 unsigned int console;
1513 void __user *up = (void __user *)arg;
1514 int perm;
1515 int ret = 0;
1516
1517 console = vc->vc_num;
1518
1519 tty_lock();
1520
1521 if (!vc_cons_allocated(console)) { /* impossible? */
1522 ret = -ENOIOCTLCMD;
1523 goto out;
1524 }
1525
1526 /*
1527 * To have permissions to do most of the vt ioctls, we either have
1528 * to be the owner of the tty, or have CAP_SYS_TTY_CONFIG.
1529 */
1530 perm = 0;
1531 if (current->signal->tty == tty || capable(CAP_SYS_TTY_CONFIG))
1532 perm = 1;
1533
1534 switch (cmd) {
1535 /*
1536 * these need special handlers for incompatible data structures
1537 */
1538 case PIO_FONTX:
1539 case GIO_FONTX:
1540 ret = compat_fontx_ioctl(cmd, up, perm, &op);
1541 break;
1542
1543 case KDFONTOP:
1544 ret = compat_kdfontop_ioctl(up, perm, &op, vc);
1545 break;
1546
1547 case PIO_UNIMAP:
1548 case GIO_UNIMAP:
1549 ret = compat_unimap_ioctl(cmd, up, perm, vc);
1550 break;
1551
1552 /*
1553 * all these treat 'arg' as an integer
1554 */
1555 case KIOCSOUND:
1556 case KDMKTONE:
1557 #ifdef CONFIG_X86
1558 case KDADDIO:
1559 case KDDELIO:
1560 #endif
1561 case KDSETMODE:
1562 case KDMAPDISP:
1563 case KDUNMAPDISP:
1564 case KDSKBMODE:
1565 case KDSKBMETA:
1566 case KDSKBLED:
1567 case KDSETLED:
1568 case KDSIGACCEPT:
1569 case VT_ACTIVATE:
1570 case VT_WAITACTIVE:
1571 case VT_RELDISP:
1572 case VT_DISALLOCATE:
1573 case VT_RESIZE:
1574 case VT_RESIZEX:
1575 goto fallback;
1576
1577 /*
1578 * the rest has a compatible data structure behind arg,
1579 * but we have to convert it to a proper 64 bit pointer.
1580 */
1581 default:
1582 arg = (unsigned long)compat_ptr(arg);
1583 goto fallback;
1584 }
1585 out:
1586 tty_unlock();
1587 return ret;
1588
1589 fallback:
1590 tty_unlock();
1591 return vt_ioctl(tty, cmd, arg);
1592 }
1593
1594
1595 #endif /* CONFIG_COMPAT */
1596
1597
1598 /*
1599 * Performs the back end of a vt switch. Called under the console
1600 * semaphore.
1601 */
1602 static void complete_change_console(struct vc_data *vc)
1603 {
1604 unsigned char old_vc_mode;
1605 int old = fg_console;
1606
1607 last_console = fg_console;
1608
1609 /*
1610 * If we're switching, we could be going from KD_GRAPHICS to
1611 * KD_TEXT mode or vice versa, which means we need to blank or
1612 * unblank the screen later.
1613 */
1614 old_vc_mode = vc_cons[fg_console].d->vc_mode;
1615 switch_screen(vc);
1616
1617 /*
1618 * This can't appear below a successful kill_pid(). If it did,
1619 * then the *blank_screen operation could occur while X, having
1620 * received acqsig, is waking up on another processor. This
1621 * condition can lead to overlapping accesses to the VGA range
1622 * and the framebuffer (causing system lockups).
1623 *
1624 * To account for this we duplicate this code below only if the
1625 * controlling process is gone and we've called reset_vc.
1626 */
1627 if (old_vc_mode != vc->vc_mode) {
1628 if (vc->vc_mode == KD_TEXT)
1629 do_unblank_screen(1);
1630 else
1631 do_blank_screen(1);
1632 }
1633
1634 /*
1635 * If this new console is under process control, send it a signal
1636 * telling it that it has acquired. Also check if it has died and
1637 * clean up (similar to logic employed in change_console())
1638 */
1639 if (vc->vt_mode.mode == VT_PROCESS) {
1640 /*
1641 * Send the signal as privileged - kill_pid() will
1642 * tell us if the process has gone or something else
1643 * is awry
1644 */
1645 if (kill_pid(vc->vt_pid, vc->vt_mode.acqsig, 1) != 0) {
1646 /*
1647 * The controlling process has died, so we revert back to
1648 * normal operation. In this case, we'll also change back
1649 * to KD_TEXT mode. I'm not sure if this is strictly correct
1650 * but it saves the agony when the X server dies and the screen
1651 * remains blanked due to KD_GRAPHICS! It would be nice to do
1652 * this outside of VT_PROCESS but there is no single process
1653 * to account for and tracking tty count may be undesirable.
1654 */
1655 reset_vc(vc);
1656
1657 if (old_vc_mode != vc->vc_mode) {
1658 if (vc->vc_mode == KD_TEXT)
1659 do_unblank_screen(1);
1660 else
1661 do_blank_screen(1);
1662 }
1663 }
1664 }
1665
1666 /*
1667 * Wake anyone waiting for their VT to activate
1668 */
1669 vt_event_post(VT_EVENT_SWITCH, old, vc->vc_num);
1670 return;
1671 }
1672
1673 /*
1674 * Performs the front-end of a vt switch
1675 */
1676 void change_console(struct vc_data *new_vc)
1677 {
1678 struct vc_data *vc;
1679
1680 if (!new_vc || new_vc->vc_num == fg_console || vt_dont_switch)
1681 return;
1682
1683 /*
1684 * If this vt is in process mode, then we need to handshake with
1685 * that process before switching. Essentially, we store where that
1686 * vt wants to switch to and wait for it to tell us when it's done
1687 * (via VT_RELDISP ioctl).
1688 *
1689 * We also check to see if the controlling process still exists.
1690 * If it doesn't, we reset this vt to auto mode and continue.
1691 * This is a cheap way to track process control. The worst thing
1692 * that can happen is: we send a signal to a process, it dies, and
1693 * the switch gets "lost" waiting for a response; hopefully, the
1694 * user will try again, we'll detect the process is gone (unless
1695 * the user waits just the right amount of time :-) and revert the
1696 * vt to auto control.
1697 */
1698 vc = vc_cons[fg_console].d;
1699 if (vc->vt_mode.mode == VT_PROCESS) {
1700 /*
1701 * Send the signal as privileged - kill_pid() will
1702 * tell us if the process has gone or something else
1703 * is awry.
1704 *
1705 * We need to set vt_newvt *before* sending the signal or we
1706 * have a race.
1707 */
1708 vc->vt_newvt = new_vc->vc_num;
1709 if (kill_pid(vc->vt_pid, vc->vt_mode.relsig, 1) == 0) {
1710 /*
1711 * It worked. Mark the vt to switch to and
1712 * return. The process needs to send us a
1713 * VT_RELDISP ioctl to complete the switch.
1714 */
1715 return;
1716 }
1717
1718 /*
1719 * The controlling process has died, so we revert back to
1720 * normal operation. In this case, we'll also change back
1721 * to KD_TEXT mode. I'm not sure if this is strictly correct
1722 * but it saves the agony when the X server dies and the screen
1723 * remains blanked due to KD_GRAPHICS! It would be nice to do
1724 * this outside of VT_PROCESS but there is no single process
1725 * to account for and tracking tty count may be undesirable.
1726 */
1727 reset_vc(vc);
1728
1729 /*
1730 * Fall through to normal (VT_AUTO) handling of the switch...
1731 */
1732 }
1733
1734 /*
1735 * Ignore all switches in KD_GRAPHICS+VT_AUTO mode
1736 */
1737 if (vc->vc_mode == KD_GRAPHICS)
1738 return;
1739
1740 complete_change_console(new_vc);
1741 }
1742
1743 /* Perform a kernel triggered VT switch for suspend/resume */
1744
1745 static int disable_vt_switch;
1746
1747 int vt_move_to_console(unsigned int vt, int alloc)
1748 {
1749 int prev;
1750
1751 console_lock();
1752 /* Graphics mode - up to X */
1753 if (disable_vt_switch) {
1754 console_unlock();
1755 return 0;
1756 }
1757 prev = fg_console;
1758
1759 if (alloc && vc_allocate(vt)) {
1760 /* we can't have a free VC for now. Too bad,
1761 * we don't want to mess the screen for now. */
1762 console_unlock();
1763 return -ENOSPC;
1764 }
1765
1766 if (set_console(vt)) {
1767 /*
1768 * We're unable to switch to the SUSPEND_CONSOLE.
1769 * Let the calling function know so it can decide
1770 * what to do.
1771 */
1772 console_unlock();
1773 return -EIO;
1774 }
1775 console_unlock();
1776 tty_lock();
1777 if (vt_waitactive(vt + 1)) {
1778 pr_debug("Suspend: Can't switch VCs.");
1779 tty_unlock();
1780 return -EINTR;
1781 }
1782 tty_unlock();
1783 return prev;
1784 }
1785
1786 /*
1787 * Normally during a suspend, we allocate a new console and switch to it.
1788 * When we resume, we switch back to the original console. This switch
1789 * can be slow, so on systems where the framebuffer can handle restoration
1790 * of video registers anyways, there's little point in doing the console
1791 * switch. This function allows you to disable it by passing it '0'.
1792 */
1793 void pm_set_vt_switch(int do_switch)
1794 {
1795 console_lock();
1796 disable_vt_switch = !do_switch;
1797 console_unlock();
1798 }
1799 EXPORT_SYMBOL(pm_set_vt_switch);