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ia64/kvm: compilation fix. export account_system_vtime.
[pv_ops_mirror.git] / drivers / char / vt_ioctl.c
blob3211afd9d57e4080eb610c7bde54098a0c7bf117
1 /*
2 * linux/drivers/char/vt_ioctl.c
3 *
4 * Copyright (C) 1992 obz under the linux copyright
5 *
6 * Dynamic diacritical handling - aeb@cwi.nl - Dec 1993
7 * Dynamic keymap and string allocation - aeb@cwi.nl - May 1994
8 * Restrict VT switching via ioctl() - grif@cs.ucr.edu - Dec 1995
9 * Some code moved for less code duplication - Andi Kleen - Mar 1997
10 * Check put/get_user, cleanups - acme@conectiva.com.br - Jun 2001
11 */
12
13 #include <linux/types.h>
14 #include <linux/errno.h>
15 #include <linux/sched.h>
16 #include <linux/tty.h>
17 #include <linux/timer.h>
18 #include <linux/kernel.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 * these are the valid i/o ports we're allowed to change. they map all the
65 * video ports
66 */
67 #define GPFIRST 0x3b4
68 #define GPLAST 0x3df
69 #define GPNUM (GPLAST - GPFIRST + 1)
70
71 #define i (tmp.kb_index)
72 #define s (tmp.kb_table)
73 #define v (tmp.kb_value)
74 static inline int
75 do_kdsk_ioctl(int cmd, struct kbentry __user *user_kbe, int perm, struct kbd_struct *kbd)
76 {
77 struct kbentry tmp;
78 ushort *key_map, val, ov;
79
80 if (copy_from_user(&tmp, user_kbe, sizeof(struct kbentry)))
81 return -EFAULT;
82
83 if (!capable(CAP_SYS_TTY_CONFIG))
84 perm = 0;
85
86 switch (cmd) {
87 case KDGKBENT:
88 key_map = key_maps[s];
89 if (key_map) {
90 val = U(key_map[i]);
91 if (kbd->kbdmode != VC_UNICODE && KTYP(val) >= NR_TYPES)
92 val = K_HOLE;
93 } else
94 val = (i ? K_HOLE : K_NOSUCHMAP);
95 return put_user(val, &user_kbe->kb_value);
96 case KDSKBENT:
97 if (!perm)
98 return -EPERM;
99 if (!i && v == K_NOSUCHMAP) {
100 /* deallocate map */
101 key_map = key_maps[s];
102 if (s && key_map) {
103 key_maps[s] = NULL;
104 if (key_map[0] == U(K_ALLOCATED)) {
105 kfree(key_map);
106 keymap_count--;
107 }
108 }
109 break;
110 }
111
112 if (KTYP(v) < NR_TYPES) {
113 if (KVAL(v) > max_vals[KTYP(v)])
114 return -EINVAL;
115 } else
116 if (kbd->kbdmode != VC_UNICODE)
117 return -EINVAL;
118
119 /* ++Geert: non-PC keyboards may generate keycode zero */
120 #if !defined(__mc68000__) && !defined(__powerpc__)
121 /* assignment to entry 0 only tests validity of args */
122 if (!i)
123 break;
124 #endif
125
126 if (!(key_map = key_maps[s])) {
127 int j;
128
129 if (keymap_count >= MAX_NR_OF_USER_KEYMAPS &&
130 !capable(CAP_SYS_RESOURCE))
131 return -EPERM;
132
133 key_map = kmalloc(sizeof(plain_map),
134 GFP_KERNEL);
135 if (!key_map)
136 return -ENOMEM;
137 key_maps[s] = key_map;
138 key_map[0] = U(K_ALLOCATED);
139 for (j = 1; j < NR_KEYS; j++)
140 key_map[j] = U(K_HOLE);
141 keymap_count++;
142 }
143 ov = U(key_map[i]);
144 if (v == ov)
145 break; /* nothing to do */
146 /*
147 * Attention Key.
148 */
149 if (((ov == K_SAK) || (v == K_SAK)) && !capable(CAP_SYS_ADMIN))
150 return -EPERM;
151 key_map[i] = U(v);
152 if (!s && (KTYP(ov) == KT_SHIFT || KTYP(v) == KT_SHIFT))
153 compute_shiftstate();
154 break;
155 }
156 return 0;
157 }
158 #undef i
159 #undef s
160 #undef v
161
162 static inline int
163 do_kbkeycode_ioctl(int cmd, struct kbkeycode __user *user_kbkc, int perm)
164 {
165 struct kbkeycode tmp;
166 int kc = 0;
167
168 if (copy_from_user(&tmp, user_kbkc, sizeof(struct kbkeycode)))
169 return -EFAULT;
170 switch (cmd) {
171 case KDGETKEYCODE:
172 kc = getkeycode(tmp.scancode);
173 if (kc >= 0)
174 kc = put_user(kc, &user_kbkc->keycode);
175 break;
176 case KDSETKEYCODE:
177 if (!perm)
178 return -EPERM;
179 kc = setkeycode(tmp.scancode, tmp.keycode);
180 break;
181 }
182 return kc;
183 }
184
185 static inline int
186 do_kdgkb_ioctl(int cmd, struct kbsentry __user *user_kdgkb, int perm)
187 {
188 struct kbsentry *kbs;
189 char *p;
190 u_char *q;
191 u_char __user *up;
192 int sz;
193 int delta;
194 char *first_free, *fj, *fnw;
195 int i, j, k;
196 int ret;
197
198 if (!capable(CAP_SYS_TTY_CONFIG))
199 perm = 0;
200
201 kbs = kmalloc(sizeof(*kbs), GFP_KERNEL);
202 if (!kbs) {
203 ret = -ENOMEM;
204 goto reterr;
205 }
206
207 /* we mostly copy too much here (512bytes), but who cares ;) */
208 if (copy_from_user(kbs, user_kdgkb, sizeof(struct kbsentry))) {
209 ret = -EFAULT;
210 goto reterr;
211 }
212 kbs->kb_string[sizeof(kbs->kb_string)-1] = '\0';
213 i = kbs->kb_func;
214
215 switch (cmd) {
216 case KDGKBSENT:
217 sz = sizeof(kbs->kb_string) - 1; /* sz should have been
218 a struct member */
219 up = user_kdgkb->kb_string;
220 p = func_table[i];
221 if(p)
222 for ( ; *p && sz; p++, sz--)
223 if (put_user(*p, up++)) {
224 ret = -EFAULT;
225 goto reterr;
226 }
227 if (put_user('\0', up)) {
228 ret = -EFAULT;
229 goto reterr;
230 }
231 kfree(kbs);
232 return ((p && *p) ? -EOVERFLOW : 0);
233 case KDSKBSENT:
234 if (!perm) {
235 ret = -EPERM;
236 goto reterr;
237 }
238
239 q = func_table[i];
240 first_free = funcbufptr + (funcbufsize - funcbufleft);
241 for (j = i+1; j < MAX_NR_FUNC && !func_table[j]; j++)
242 ;
243 if (j < MAX_NR_FUNC)
244 fj = func_table[j];
245 else
246 fj = first_free;
247
248 delta = (q ? -strlen(q) : 1) + strlen(kbs->kb_string);
249 if (delta <= funcbufleft) { /* it fits in current buf */
250 if (j < MAX_NR_FUNC) {
251 memmove(fj + delta, fj, first_free - fj);
252 for (k = j; k < MAX_NR_FUNC; k++)
253 if (func_table[k])
254 func_table[k] += delta;
255 }
256 if (!q)
257 func_table[i] = fj;
258 funcbufleft -= delta;
259 } else { /* allocate a larger buffer */
260 sz = 256;
261 while (sz < funcbufsize - funcbufleft + delta)
262 sz <<= 1;
263 fnw = kmalloc(sz, GFP_KERNEL);
264 if(!fnw) {
265 ret = -ENOMEM;
266 goto reterr;
267 }
268
269 if (!q)
270 func_table[i] = fj;
271 if (fj > funcbufptr)
272 memmove(fnw, funcbufptr, fj - funcbufptr);
273 for (k = 0; k < j; k++)
274 if (func_table[k])
275 func_table[k] = fnw + (func_table[k] - funcbufptr);
276
277 if (first_free > fj) {
278 memmove(fnw + (fj - funcbufptr) + delta, fj, first_free - fj);
279 for (k = j; k < MAX_NR_FUNC; k++)
280 if (func_table[k])
281 func_table[k] = fnw + (func_table[k] - funcbufptr) + delta;
282 }
283 if (funcbufptr != func_buf)
284 kfree(funcbufptr);
285 funcbufptr = fnw;
286 funcbufleft = funcbufleft - delta + sz - funcbufsize;
287 funcbufsize = sz;
288 }
289 strcpy(func_table[i], kbs->kb_string);
290 break;
291 }
292 ret = 0;
293 reterr:
294 kfree(kbs);
295 return ret;
296 }
297
298 static inline int
299 do_fontx_ioctl(int cmd, struct consolefontdesc __user *user_cfd, int perm, struct console_font_op *op)
300 {
301 struct consolefontdesc cfdarg;
302 int i;
303
304 if (copy_from_user(&cfdarg, user_cfd, sizeof(struct consolefontdesc)))
305 return -EFAULT;
306
307 switch (cmd) {
308 case PIO_FONTX:
309 if (!perm)
310 return -EPERM;
311 op->op = KD_FONT_OP_SET;
312 op->flags = KD_FONT_FLAG_OLD;
313 op->width = 8;
314 op->height = cfdarg.charheight;
315 op->charcount = cfdarg.charcount;
316 op->data = cfdarg.chardata;
317 return con_font_op(vc_cons[fg_console].d, op);
318 case GIO_FONTX: {
319 op->op = KD_FONT_OP_GET;
320 op->flags = KD_FONT_FLAG_OLD;
321 op->width = 8;
322 op->height = cfdarg.charheight;
323 op->charcount = cfdarg.charcount;
324 op->data = cfdarg.chardata;
325 i = con_font_op(vc_cons[fg_console].d, op);
326 if (i)
327 return i;
328 cfdarg.charheight = op->height;
329 cfdarg.charcount = op->charcount;
330 if (copy_to_user(user_cfd, &cfdarg, sizeof(struct consolefontdesc)))
331 return -EFAULT;
332 return 0;
333 }
334 }
335 return -EINVAL;
336 }
337
338 static inline int
339 do_unimap_ioctl(int cmd, struct unimapdesc __user *user_ud, int perm, struct vc_data *vc)
340 {
341 struct unimapdesc tmp;
342
343 if (copy_from_user(&tmp, user_ud, sizeof tmp))
344 return -EFAULT;
345 if (tmp.entries)
346 if (!access_ok(VERIFY_WRITE, tmp.entries,
347 tmp.entry_ct*sizeof(struct unipair)))
348 return -EFAULT;
349 switch (cmd) {
350 case PIO_UNIMAP:
351 if (!perm)
352 return -EPERM;
353 return con_set_unimap(vc, tmp.entry_ct, tmp.entries);
354 case GIO_UNIMAP:
355 if (!perm && fg_console != vc->vc_num)
356 return -EPERM;
357 return con_get_unimap(vc, tmp.entry_ct, &(user_ud->entry_ct), tmp.entries);
358 }
359 return 0;
360 }
361
362 /*
363 * We handle the console-specific ioctl's here. We allow the
364 * capability to modify any console, not just the fg_console.
365 */
366 int vt_ioctl(struct tty_struct *tty, struct file * file,
367 unsigned int cmd, unsigned long arg)
368 {
369 struct vc_data *vc = (struct vc_data *)tty->driver_data;
370 struct console_font_op op; /* used in multiple places here */
371 struct kbd_struct * kbd;
372 unsigned int console;
373 unsigned char ucval;
374 void __user *up = (void __user *)arg;
375 int i, perm;
376 int ret = 0;
377
378 console = vc->vc_num;
379
380 lock_kernel();
381
382 if (!vc_cons_allocated(console)) { /* impossible? */
383 ret = -ENOIOCTLCMD;
384 goto out;
385 }
386
387
388 /*
389 * To have permissions to do most of the vt ioctls, we either have
390 * to be the owner of the tty, or have CAP_SYS_TTY_CONFIG.
391 */
392 perm = 0;
393 if (current->signal->tty == tty || capable(CAP_SYS_TTY_CONFIG))
394 perm = 1;
395
396 kbd = kbd_table + console;
397 switch (cmd) {
398 case KIOCSOUND:
399 if (!perm)
400 goto eperm;
401 if (arg)
402 arg = CLOCK_TICK_RATE / arg;
403 kd_mksound(arg, 0);
404 break;
405
406 case KDMKTONE:
407 if (!perm)
408 goto eperm;
409 {
410 unsigned int ticks, count;
411
412 /*
413 * Generate the tone for the appropriate number of ticks.
414 * If the time is zero, turn off sound ourselves.
415 */
416 ticks = HZ * ((arg >> 16) & 0xffff) / 1000;
417 count = ticks ? (arg & 0xffff) : 0;
418 if (count)
419 count = CLOCK_TICK_RATE / count;
420 kd_mksound(count, ticks);
421 break;
422 }
423
424 case KDGKBTYPE:
425 /*
426 * this is naive.
427 */
428 ucval = KB_101;
429 goto setchar;
430
431 /*
432 * These cannot be implemented on any machine that implements
433 * ioperm() in user level (such as Alpha PCs) or not at all.
434 *
435 * XXX: you should never use these, just call ioperm directly..
436 */
437 #ifdef CONFIG_X86
438 case KDADDIO:
439 case KDDELIO:
440 /*
441 * KDADDIO and KDDELIO may be able to add ports beyond what
442 * we reject here, but to be safe...
443 */
444 if (arg < GPFIRST || arg > GPLAST) {
445 ret = -EINVAL;
446 break;
447 }
448 ret = sys_ioperm(arg, 1, (cmd == KDADDIO)) ? -ENXIO : 0;
449 break;
450
451 case KDENABIO:
452 case KDDISABIO:
453 ret = sys_ioperm(GPFIRST, GPNUM,
454 (cmd == KDENABIO)) ? -ENXIO : 0;
455 break;
456 #endif
457
458 /* Linux m68k/i386 interface for setting the keyboard delay/repeat rate */
459
460 case KDKBDREP:
461 {
462 struct kbd_repeat kbrep;
463
464 if (!capable(CAP_SYS_TTY_CONFIG))
465 goto eperm;
466
467 if (copy_from_user(&kbrep, up, sizeof(struct kbd_repeat))) {
468 ret = -EFAULT;
469 break;
470 }
471 ret = kbd_rate(&kbrep);
472 if (ret)
473 break;
474 if (copy_to_user(up, &kbrep, sizeof(struct kbd_repeat)))
475 ret = -EFAULT;
476 break;
477 }
478
479 case KDSETMODE:
480 /*
481 * currently, setting the mode from KD_TEXT to KD_GRAPHICS
482 * doesn't do a whole lot. i'm not sure if it should do any
483 * restoration of modes or what...
484 *
485 * XXX It should at least call into the driver, fbdev's definitely
486 * need to restore their engine state. --BenH
487 */
488 if (!perm)
489 goto eperm;
490 switch (arg) {
491 case KD_GRAPHICS:
492 break;
493 case KD_TEXT0:
494 case KD_TEXT1:
495 arg = KD_TEXT;
496 case KD_TEXT:
497 break;
498 default:
499 ret = -EINVAL;
500 goto out;
501 }
502 if (vc->vc_mode == (unsigned char) arg)
503 break;
504 vc->vc_mode = (unsigned char) arg;
505 if (console != fg_console)
506 break;
507 /*
508 * explicitly blank/unblank the screen if switching modes
509 */
510 acquire_console_sem();
511 if (arg == KD_TEXT)
512 do_unblank_screen(1);
513 else
514 do_blank_screen(1);
515 release_console_sem();
516 break;
517
518 case KDGETMODE:
519 ucval = vc->vc_mode;
520 goto setint;
521
522 case KDMAPDISP:
523 case KDUNMAPDISP:
524 /*
525 * these work like a combination of mmap and KDENABIO.
526 * this could be easily finished.
527 */
528 ret = -EINVAL;
529 break;
530
531 case KDSKBMODE:
532 if (!perm)
533 goto eperm;
534 switch(arg) {
535 case K_RAW:
536 kbd->kbdmode = VC_RAW;
537 break;
538 case K_MEDIUMRAW:
539 kbd->kbdmode = VC_MEDIUMRAW;
540 break;
541 case K_XLATE:
542 kbd->kbdmode = VC_XLATE;
543 compute_shiftstate();
544 break;
545 case K_UNICODE:
546 kbd->kbdmode = VC_UNICODE;
547 compute_shiftstate();
548 break;
549 default:
550 ret = -EINVAL;
551 goto out;
552 }
553 tty_ldisc_flush(tty);
554 break;
555
556 case KDGKBMODE:
557 ucval = ((kbd->kbdmode == VC_RAW) ? K_RAW :
558 (kbd->kbdmode == VC_MEDIUMRAW) ? K_MEDIUMRAW :
559 (kbd->kbdmode == VC_UNICODE) ? K_UNICODE :
560 K_XLATE);
561 goto setint;
562
563 /* this could be folded into KDSKBMODE, but for compatibility
564 reasons it is not so easy to fold KDGKBMETA into KDGKBMODE */
565 case KDSKBMETA:
566 switch(arg) {
567 case K_METABIT:
568 clr_vc_kbd_mode(kbd, VC_META);
569 break;
570 case K_ESCPREFIX:
571 set_vc_kbd_mode(kbd, VC_META);
572 break;
573 default:
574 ret = -EINVAL;
575 }
576 break;
577
578 case KDGKBMETA:
579 ucval = (vc_kbd_mode(kbd, VC_META) ? K_ESCPREFIX : K_METABIT);
580 setint:
581 ret = put_user(ucval, (int __user *)arg);
582 break;
583
584 case KDGETKEYCODE:
585 case KDSETKEYCODE:
586 if(!capable(CAP_SYS_TTY_CONFIG))
587 perm = 0;
588 ret = do_kbkeycode_ioctl(cmd, up, perm);
589 break;
590
591 case KDGKBENT:
592 case KDSKBENT:
593 ret = do_kdsk_ioctl(cmd, up, perm, kbd);
594 break;
595
596 case KDGKBSENT:
597 case KDSKBSENT:
598 ret = do_kdgkb_ioctl(cmd, up, perm);
599 break;
600
601 case KDGKBDIACR:
602 {
603 struct kbdiacrs __user *a = up;
604 struct kbdiacr diacr;
605 int i;
606
607 if (put_user(accent_table_size, &a->kb_cnt)) {
608 ret = -EFAULT;
609 break;
610 }
611 for (i = 0; i < accent_table_size; i++) {
612 diacr.diacr = conv_uni_to_8bit(accent_table[i].diacr);
613 diacr.base = conv_uni_to_8bit(accent_table[i].base);
614 diacr.result = conv_uni_to_8bit(accent_table[i].result);
615 if (copy_to_user(a->kbdiacr + i, &diacr, sizeof(struct kbdiacr))) {
616 ret = -EFAULT;
617 break;
618 }
619 }
620 break;
621 }
622 case KDGKBDIACRUC:
623 {
624 struct kbdiacrsuc __user *a = up;
625
626 if (put_user(accent_table_size, &a->kb_cnt))
627 ret = -EFAULT;
628 else if (copy_to_user(a->kbdiacruc, accent_table,
629 accent_table_size*sizeof(struct kbdiacruc)))
630 ret = -EFAULT;
631 break;
632 }
633
634 case KDSKBDIACR:
635 {
636 struct kbdiacrs __user *a = up;
637 struct kbdiacr diacr;
638 unsigned int ct;
639 int i;
640
641 if (!perm)
642 goto eperm;
643 if (get_user(ct,&a->kb_cnt)) {
644 ret = -EFAULT;
645 break;
646 }
647 if (ct >= MAX_DIACR) {
648 ret = -EINVAL;
649 break;
650 }
651 accent_table_size = ct;
652 for (i = 0; i < ct; i++) {
653 if (copy_from_user(&diacr, a->kbdiacr + i, sizeof(struct kbdiacr))) {
654 ret = -EFAULT;
655 break;
656 }
657 accent_table[i].diacr = conv_8bit_to_uni(diacr.diacr);
658 accent_table[i].base = conv_8bit_to_uni(diacr.base);
659 accent_table[i].result = conv_8bit_to_uni(diacr.result);
660 }
661 break;
662 }
663
664 case KDSKBDIACRUC:
665 {
666 struct kbdiacrsuc __user *a = up;
667 unsigned int ct;
668
669 if (!perm)
670 goto eperm;
671 if (get_user(ct,&a->kb_cnt)) {
672 ret = -EFAULT;
673 break;
674 }
675 if (ct >= MAX_DIACR) {
676 ret = -EINVAL;
677 break;
678 }
679 accent_table_size = ct;
680 if (copy_from_user(accent_table, a->kbdiacruc, ct*sizeof(struct kbdiacruc)))
681 ret = -EFAULT;
682 break;
683 }
684
685 /* the ioctls below read/set the flags usually shown in the leds */
686 /* don't use them - they will go away without warning */
687 case KDGKBLED:
688 ucval = kbd->ledflagstate | (kbd->default_ledflagstate << 4);
689 goto setchar;
690
691 case KDSKBLED:
692 if (!perm)
693 goto eperm;
694 if (arg & ~0x77) {
695 ret = -EINVAL;
696 break;
697 }
698 kbd->ledflagstate = (arg & 7);
699 kbd->default_ledflagstate = ((arg >> 4) & 7);
700 set_leds();
701 break;
702
703 /* the ioctls below only set the lights, not the functions */
704 /* for those, see KDGKBLED and KDSKBLED above */
705 case KDGETLED:
706 ucval = getledstate();
707 setchar:
708 ret = put_user(ucval, (char __user *)arg);
709 break;
710
711 case KDSETLED:
712 if (!perm)
713 goto eperm;
714 setledstate(kbd, arg);
715 break;
716
717 /*
718 * A process can indicate its willingness to accept signals
719 * generated by pressing an appropriate key combination.
720 * Thus, one can have a daemon that e.g. spawns a new console
721 * upon a keypress and then changes to it.
722 * See also the kbrequest field of inittab(5).
723 */
724 case KDSIGACCEPT:
725 {
726 if (!perm || !capable(CAP_KILL))
727 goto eperm;
728 if (!valid_signal(arg) || arg < 1 || arg == SIGKILL)
729 ret = -EINVAL;
730 else {
731 spin_lock_irq(&vt_spawn_con.lock);
732 put_pid(vt_spawn_con.pid);
733 vt_spawn_con.pid = get_pid(task_pid(current));
734 vt_spawn_con.sig = arg;
735 spin_unlock_irq(&vt_spawn_con.lock);
736 }
737 break;
738 }
739
740 case VT_SETMODE:
741 {
742 struct vt_mode tmp;
743
744 if (!perm)
745 goto eperm;
746 if (copy_from_user(&tmp, up, sizeof(struct vt_mode))) {
747 ret = -EFAULT;
748 goto out;
749 }
750 if (tmp.mode != VT_AUTO && tmp.mode != VT_PROCESS) {
751 ret = -EINVAL;
752 goto out;
753 }
754 acquire_console_sem();
755 vc->vt_mode = tmp;
756 /* the frsig is ignored, so we set it to 0 */
757 vc->vt_mode.frsig = 0;
758 put_pid(vc->vt_pid);
759 vc->vt_pid = get_pid(task_pid(current));
760 /* no switch is required -- saw@shade.msu.ru */
761 vc->vt_newvt = -1;
762 release_console_sem();
763 break;
764 }
765
766 case VT_GETMODE:
767 {
768 struct vt_mode tmp;
769 int rc;
770
771 acquire_console_sem();
772 memcpy(&tmp, &vc->vt_mode, sizeof(struct vt_mode));
773 release_console_sem();
774
775 rc = copy_to_user(up, &tmp, sizeof(struct vt_mode));
776 if (rc)
777 ret = -EFAULT;
778 break;
779 }
780
781 /*
782 * Returns global vt state. Note that VT 0 is always open, since
783 * it's an alias for the current VT, and people can't use it here.
784 * We cannot return state for more than 16 VTs, since v_state is short.
785 */
786 case VT_GETSTATE:
787 {
788 struct vt_stat __user *vtstat = up;
789 unsigned short state, mask;
790
791 if (put_user(fg_console + 1, &vtstat->v_active))
792 ret = -EFAULT;
793 else {
794 state = 1; /* /dev/tty0 is always open */
795 for (i = 0, mask = 2; i < MAX_NR_CONSOLES && mask;
796 ++i, mask <<= 1)
797 if (VT_IS_IN_USE(i))
798 state |= mask;
799 ret = put_user(state, &vtstat->v_state);
800 }
801 break;
802 }
803
804 /*
805 * Returns the first available (non-opened) console.
806 */
807 case VT_OPENQRY:
808 for (i = 0; i < MAX_NR_CONSOLES; ++i)
809 if (! VT_IS_IN_USE(i))
810 break;
811 ucval = i < MAX_NR_CONSOLES ? (i+1) : -1;
812 goto setint;
813
814 /*
815 * ioctl(fd, VT_ACTIVATE, num) will cause us to switch to vt # num,
816 * with num >= 1 (switches to vt 0, our console, are not allowed, just
817 * to preserve sanity).
818 */
819 case VT_ACTIVATE:
820 if (!perm)
821 goto eperm;
822 if (arg == 0 || arg > MAX_NR_CONSOLES)
823 ret = -ENXIO;
824 else {
825 arg--;
826 acquire_console_sem();
827 ret = vc_allocate(arg);
828 release_console_sem();
829 if (ret)
830 break;
831 set_console(arg);
832 }
833 break;
834
835 /*
836 * wait until the specified VT has been activated
837 */
838 case VT_WAITACTIVE:
839 if (!perm)
840 goto eperm;
841 if (arg == 0 || arg > MAX_NR_CONSOLES)
842 ret = -ENXIO;
843 else
844 ret = vt_waitactive(arg - 1);
845 break;
846
847 /*
848 * If a vt is under process control, the kernel will not switch to it
849 * immediately, but postpone the operation until the process calls this
850 * ioctl, allowing the switch to complete.
851 *
852 * According to the X sources this is the behavior:
853 * 0: pending switch-from not OK
854 * 1: pending switch-from OK
855 * 2: completed switch-to OK
856 */
857 case VT_RELDISP:
858 if (!perm)
859 goto eperm;
860
861 if (vc->vt_mode.mode != VT_PROCESS) {
862 ret = -EINVAL;
863 break;
864 }
865 /*
866 * Switching-from response
867 */
868 acquire_console_sem();
869 if (vc->vt_newvt >= 0) {
870 if (arg == 0)
871 /*
872 * Switch disallowed, so forget we were trying
873 * to do it.
874 */
875 vc->vt_newvt = -1;
876
877 else {
878 /*
879 * The current vt has been released, so
880 * complete the switch.
881 */
882 int newvt;
883 newvt = vc->vt_newvt;
884 vc->vt_newvt = -1;
885 ret = vc_allocate(newvt);
886 if (ret) {
887 release_console_sem();
888 break;
889 }
890 /*
891 * When we actually do the console switch,
892 * make sure we are atomic with respect to
893 * other console switches..
894 */
895 complete_change_console(vc_cons[newvt].d);
896 }
897 } else {
898 /*
899 * Switched-to response
900 */
901 /*
902 * If it's just an ACK, ignore it
903 */
904 if (arg != VT_ACKACQ)
905 ret = -EINVAL;
906 }
907 release_console_sem();
908 break;
909
910 /*
911 * Disallocate memory associated to VT (but leave VT1)
912 */
913 case VT_DISALLOCATE:
914 if (arg > MAX_NR_CONSOLES) {
915 ret = -ENXIO;
916 break;
917 }
918 if (arg == 0) {
919 /* deallocate all unused consoles, but leave 0 */
920 acquire_console_sem();
921 for (i=1; i<MAX_NR_CONSOLES; i++)
922 if (! VT_BUSY(i))
923 vc_deallocate(i);
924 release_console_sem();
925 } else {
926 /* deallocate a single console, if possible */
927 arg--;
928 if (VT_BUSY(arg))
929 ret = -EBUSY;
930 else if (arg) { /* leave 0 */
931 acquire_console_sem();
932 vc_deallocate(arg);
933 release_console_sem();
934 }
935 }
936 break;
937
938 case VT_RESIZE:
939 {
940 struct vt_sizes __user *vtsizes = up;
941 struct vc_data *vc;
942
943 ushort ll,cc;
944 if (!perm)
945 goto eperm;
946 if (get_user(ll, &vtsizes->v_rows) ||
947 get_user(cc, &vtsizes->v_cols))
948 ret = -EFAULT;
949 else {
950 for (i = 0; i < MAX_NR_CONSOLES; i++) {
951 vc = vc_cons[i].d;
952
953 if (vc) {
954 vc->vc_resize_user = 1;
955 vc_lock_resize(vc_cons[i].d, cc, ll);
956 }
957 }
958 }
959 break;
960 }
961
962 case VT_RESIZEX:
963 {
964 struct vt_consize __user *vtconsize = up;
965 ushort ll,cc,vlin,clin,vcol,ccol;
966 if (!perm)
967 goto eperm;
968 if (!access_ok(VERIFY_READ, vtconsize,
969 sizeof(struct vt_consize))) {
970 ret = -EFAULT;
971 break;
972 }
973 /* FIXME: Should check the copies properly */
974 __get_user(ll, &vtconsize->v_rows);
975 __get_user(cc, &vtconsize->v_cols);
976 __get_user(vlin, &vtconsize->v_vlin);
977 __get_user(clin, &vtconsize->v_clin);
978 __get_user(vcol, &vtconsize->v_vcol);
979 __get_user(ccol, &vtconsize->v_ccol);
980 vlin = vlin ? vlin : vc->vc_scan_lines;
981 if (clin) {
982 if (ll) {
983 if (ll != vlin/clin) {
984 /* Parameters don't add up */
985 ret = -EINVAL;
986 break;
987 }
988 } else
989 ll = vlin/clin;
990 }
991 if (vcol && ccol) {
992 if (cc) {
993 if (cc != vcol/ccol) {
994 ret = -EINVAL;
995 break;
996 }
997 } else
998 cc = vcol/ccol;
999 }
1000
1001 if (clin > 32) {
1002 ret = -EINVAL;
1003 break;
1004 }
1005
1006 for (i = 0; i < MAX_NR_CONSOLES; i++) {
1007 if (!vc_cons[i].d)
1008 continue;
1009 acquire_console_sem();
1010 if (vlin)
1011 vc_cons[i].d->vc_scan_lines = vlin;
1012 if (clin)
1013 vc_cons[i].d->vc_font.height = clin;
1014 vc_cons[i].d->vc_resize_user = 1;
1015 vc_resize(vc_cons[i].d, cc, ll);
1016 release_console_sem();
1017 }
1018 break;
1019 }
1020
1021 case PIO_FONT: {
1022 if (!perm)
1023 goto eperm;
1024 op.op = KD_FONT_OP_SET;
1025 op.flags = KD_FONT_FLAG_OLD | KD_FONT_FLAG_DONT_RECALC; /* Compatibility */
1026 op.width = 8;
1027 op.height = 0;
1028 op.charcount = 256;
1029 op.data = up;
1030 ret = con_font_op(vc_cons[fg_console].d, &op);
1031 break;
1032 }
1033
1034 case GIO_FONT: {
1035 op.op = KD_FONT_OP_GET;
1036 op.flags = KD_FONT_FLAG_OLD;
1037 op.width = 8;
1038 op.height = 32;
1039 op.charcount = 256;
1040 op.data = up;
1041 ret = con_font_op(vc_cons[fg_console].d, &op);
1042 break;
1043 }
1044
1045 case PIO_CMAP:
1046 if (!perm)
1047 ret = -EPERM;
1048 else
1049 ret = con_set_cmap(up);
1050 break;
1051
1052 case GIO_CMAP:
1053 ret = con_get_cmap(up);
1054 break;
1055
1056 case PIO_FONTX:
1057 case GIO_FONTX:
1058 ret = do_fontx_ioctl(cmd, up, perm, &op);
1059 break;
1060
1061 case PIO_FONTRESET:
1062 {
1063 if (!perm)
1064 goto eperm;
1065
1066 #ifdef BROKEN_GRAPHICS_PROGRAMS
1067 /* With BROKEN_GRAPHICS_PROGRAMS defined, the default
1068 font is not saved. */
1069 ret = -ENOSYS;
1070 break;
1071 #else
1072 {
1073 op.op = KD_FONT_OP_SET_DEFAULT;
1074 op.data = NULL;
1075 ret = con_font_op(vc_cons[fg_console].d, &op);
1076 if (ret)
1077 break;
1078 con_set_default_unimap(vc_cons[fg_console].d);
1079 break;
1080 }
1081 #endif
1082 }
1083
1084 case KDFONTOP: {
1085 if (copy_from_user(&op, up, sizeof(op))) {
1086 ret = -EFAULT;
1087 break;
1088 }
1089 if (!perm && op.op != KD_FONT_OP_GET)
1090 goto eperm;
1091 ret = con_font_op(vc, &op);
1092 if (ret)
1093 break;
1094 if (copy_to_user(up, &op, sizeof(op)))
1095 ret = -EFAULT;
1096 break;
1097 }
1098
1099 case PIO_SCRNMAP:
1100 if (!perm)
1101 ret = -EPERM;
1102 else
1103 ret = con_set_trans_old(up);
1104 break;
1105
1106 case GIO_SCRNMAP:
1107 ret = con_get_trans_old(up);
1108 break;
1109
1110 case PIO_UNISCRNMAP:
1111 if (!perm)
1112 ret = -EPERM;
1113 else
1114 ret = con_set_trans_new(up);
1115 break;
1116
1117 case GIO_UNISCRNMAP:
1118 ret = con_get_trans_new(up);
1119 break;
1120
1121 case PIO_UNIMAPCLR:
1122 { struct unimapinit ui;
1123 if (!perm)
1124 goto eperm;
1125 ret = copy_from_user(&ui, up, sizeof(struct unimapinit));
1126 if (!ret)
1127 con_clear_unimap(vc, &ui);
1128 break;
1129 }
1130
1131 case PIO_UNIMAP:
1132 case GIO_UNIMAP:
1133 ret = do_unimap_ioctl(cmd, up, perm, vc);
1134 break;
1135
1136 case VT_LOCKSWITCH:
1137 if (!capable(CAP_SYS_TTY_CONFIG))
1138 goto eperm;
1139 vt_dont_switch = 1;
1140 break;
1141 case VT_UNLOCKSWITCH:
1142 if (!capable(CAP_SYS_TTY_CONFIG))
1143 goto eperm;
1144 vt_dont_switch = 0;
1145 break;
1146 case VT_GETHIFONTMASK:
1147 ret = put_user(vc->vc_hi_font_mask,
1148 (unsigned short __user *)arg);
1149 break;
1150 default:
1151 ret = -ENOIOCTLCMD;
1152 }
1153 out:
1154 unlock_kernel();
1155 return ret;
1156 eperm:
1157 ret = -EPERM;
1158 goto out;
1159 }
1160
1161 /*
1162 * Sometimes we want to wait until a particular VT has been activated. We
1163 * do it in a very simple manner. Everybody waits on a single queue and
1164 * get woken up at once. Those that are satisfied go on with their business,
1165 * while those not ready go back to sleep. Seems overkill to add a wait
1166 * to each vt just for this - usually this does nothing!
1167 */
1168 static DECLARE_WAIT_QUEUE_HEAD(vt_activate_queue);
1169
1170 /*
1171 * Sleeps until a vt is activated, or the task is interrupted. Returns
1172 * 0 if activation, -EINTR if interrupted by a signal handler.
1173 */
1174 int vt_waitactive(int vt)
1175 {
1176 int retval;
1177 DECLARE_WAITQUEUE(wait, current);
1178
1179 add_wait_queue(&vt_activate_queue, &wait);
1180 for (;;) {
1181 retval = 0;
1182
1183 /*
1184 * Synchronize with redraw_screen(). By acquiring the console
1185 * semaphore we make sure that the console switch is completed
1186 * before we return. If we didn't wait for the semaphore, we
1187 * could return at a point where fg_console has already been
1188 * updated, but the console switch hasn't been completed.
1189 */
1190 acquire_console_sem();
1191 set_current_state(TASK_INTERRUPTIBLE);
1192 if (vt == fg_console) {
1193 release_console_sem();
1194 break;
1195 }
1196 release_console_sem();
1197 retval = -ERESTARTNOHAND;
1198 if (signal_pending(current))
1199 break;
1200 schedule();
1201 }
1202 remove_wait_queue(&vt_activate_queue, &wait);
1203 __set_current_state(TASK_RUNNING);
1204 return retval;
1205 }
1206
1207 #define vt_wake_waitactive() wake_up(&vt_activate_queue)
1208
1209 void reset_vc(struct vc_data *vc)
1210 {
1211 vc->vc_mode = KD_TEXT;
1212 kbd_table[vc->vc_num].kbdmode = default_utf8 ? VC_UNICODE : VC_XLATE;
1213 vc->vt_mode.mode = VT_AUTO;
1214 vc->vt_mode.waitv = 0;
1215 vc->vt_mode.relsig = 0;
1216 vc->vt_mode.acqsig = 0;
1217 vc->vt_mode.frsig = 0;
1218 put_pid(vc->vt_pid);
1219 vc->vt_pid = NULL;
1220 vc->vt_newvt = -1;
1221 if (!in_interrupt()) /* Via keyboard.c:SAK() - akpm */
1222 reset_palette(vc);
1223 }
1224
1225 void vc_SAK(struct work_struct *work)
1226 {
1227 struct vc *vc_con =
1228 container_of(work, struct vc, SAK_work);
1229 struct vc_data *vc;
1230 struct tty_struct *tty;
1231
1232 acquire_console_sem();
1233 vc = vc_con->d;
1234 if (vc) {
1235 tty = vc->vc_tty;
1236 /*
1237 * SAK should also work in all raw modes and reset
1238 * them properly.
1239 */
1240 if (tty)
1241 __do_SAK(tty);
1242 reset_vc(vc);
1243 }
1244 release_console_sem();
1245 }
1246
1247 /*
1248 * Performs the back end of a vt switch
1249 */
1250 static void complete_change_console(struct vc_data *vc)
1251 {
1252 unsigned char old_vc_mode;
1253
1254 last_console = fg_console;
1255
1256 /*
1257 * If we're switching, we could be going from KD_GRAPHICS to
1258 * KD_TEXT mode or vice versa, which means we need to blank or
1259 * unblank the screen later.
1260 */
1261 old_vc_mode = vc_cons[fg_console].d->vc_mode;
1262 switch_screen(vc);
1263
1264 /*
1265 * This can't appear below a successful kill_pid(). If it did,
1266 * then the *blank_screen operation could occur while X, having
1267 * received acqsig, is waking up on another processor. This
1268 * condition can lead to overlapping accesses to the VGA range
1269 * and the framebuffer (causing system lockups).
1270 *
1271 * To account for this we duplicate this code below only if the
1272 * controlling process is gone and we've called reset_vc.
1273 */
1274 if (old_vc_mode != vc->vc_mode) {
1275 if (vc->vc_mode == KD_TEXT)
1276 do_unblank_screen(1);
1277 else
1278 do_blank_screen(1);
1279 }
1280
1281 /*
1282 * If this new console is under process control, send it a signal
1283 * telling it that it has acquired. Also check if it has died and
1284 * clean up (similar to logic employed in change_console())
1285 */
1286 if (vc->vt_mode.mode == VT_PROCESS) {
1287 /*
1288 * Send the signal as privileged - kill_pid() will
1289 * tell us if the process has gone or something else
1290 * is awry
1291 */
1292 if (kill_pid(vc->vt_pid, vc->vt_mode.acqsig, 1) != 0) {
1293 /*
1294 * The controlling process has died, so we revert back to
1295 * normal operation. In this case, we'll also change back
1296 * to KD_TEXT mode. I'm not sure if this is strictly correct
1297 * but it saves the agony when the X server dies and the screen
1298 * remains blanked due to KD_GRAPHICS! It would be nice to do
1299 * this outside of VT_PROCESS but there is no single process
1300 * to account for and tracking tty count may be undesirable.
1301 */
1302 reset_vc(vc);
1303
1304 if (old_vc_mode != vc->vc_mode) {
1305 if (vc->vc_mode == KD_TEXT)
1306 do_unblank_screen(1);
1307 else
1308 do_blank_screen(1);
1309 }
1310 }
1311 }
1312
1313 /*
1314 * Wake anyone waiting for their VT to activate
1315 */
1316 vt_wake_waitactive();
1317 return;
1318 }
1319
1320 /*
1321 * Performs the front-end of a vt switch
1322 */
1323 void change_console(struct vc_data *new_vc)
1324 {
1325 struct vc_data *vc;
1326
1327 if (!new_vc || new_vc->vc_num == fg_console || vt_dont_switch)
1328 return;
1329
1330 /*
1331 * If this vt is in process mode, then we need to handshake with
1332 * that process before switching. Essentially, we store where that
1333 * vt wants to switch to and wait for it to tell us when it's done
1334 * (via VT_RELDISP ioctl).
1335 *
1336 * We also check to see if the controlling process still exists.
1337 * If it doesn't, we reset this vt to auto mode and continue.
1338 * This is a cheap way to track process control. The worst thing
1339 * that can happen is: we send a signal to a process, it dies, and
1340 * the switch gets "lost" waiting for a response; hopefully, the
1341 * user will try again, we'll detect the process is gone (unless
1342 * the user waits just the right amount of time :-) and revert the
1343 * vt to auto control.
1344 */
1345 vc = vc_cons[fg_console].d;
1346 if (vc->vt_mode.mode == VT_PROCESS) {
1347 /*
1348 * Send the signal as privileged - kill_pid() will
1349 * tell us if the process has gone or something else
1350 * is awry.
1351 *
1352 * We need to set vt_newvt *before* sending the signal or we
1353 * have a race.
1354 */
1355 vc->vt_newvt = new_vc->vc_num;
1356 if (kill_pid(vc->vt_pid, vc->vt_mode.relsig, 1) == 0) {
1357 /*
1358 * It worked. Mark the vt to switch to and
1359 * return. The process needs to send us a
1360 * VT_RELDISP ioctl to complete the switch.
1361 */
1362 return;
1363 }
1364
1365 /*
1366 * The controlling process has died, so we revert back to
1367 * normal operation. In this case, we'll also change back
1368 * to KD_TEXT mode. I'm not sure if this is strictly correct
1369 * but it saves the agony when the X server dies and the screen
1370 * remains blanked due to KD_GRAPHICS! It would be nice to do
1371 * this outside of VT_PROCESS but there is no single process
1372 * to account for and tracking tty count may be undesirable.
1373 */
1374 reset_vc(vc);
1375
1376 /*
1377 * Fall through to normal (VT_AUTO) handling of the switch...
1378 */
1379 }
1380
1381 /*
1382 * Ignore all switches in KD_GRAPHICS+VT_AUTO mode
1383 */
1384 if (vc->vc_mode == KD_GRAPHICS)
1385 return;
1386
1387 complete_change_console(new_vc);
1388 }
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