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[PATCH] build fix: CONFIG_MEMORY_HOTPLUG=y on i386
[linux-2.6/sactl.git] / drivers / char / vt_ioctl.c
blob24011e7c81ff72fa6bade2d7c889c8a0c2c48c5a
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/config.h>
14 #include <linux/types.h>
15 #include <linux/errno.h>
16 #include <linux/sched.h>
17 #include <linux/tty.h>
18 #include <linux/timer.h>
19 #include <linux/kernel.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/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 static 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 /* disallocate 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 = (ushort *) 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 = (char *) 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
377 console = vc->vc_num;
378
379 if (!vc_cons_allocated(console)) /* impossible? */
380 return -ENOIOCTLCMD;
381
382 /*
383 * To have permissions to do most of the vt ioctls, we either have
384 * to be the owner of the tty, or have CAP_SYS_TTY_CONFIG.
385 */
386 perm = 0;
387 if (current->signal->tty == tty || capable(CAP_SYS_TTY_CONFIG))
388 perm = 1;
389
390 kbd = kbd_table + console;
391 switch (cmd) {
392 case KIOCSOUND:
393 if (!perm)
394 return -EPERM;
395 if (arg)
396 arg = CLOCK_TICK_RATE / arg;
397 kd_mksound(arg, 0);
398 return 0;
399
400 case KDMKTONE:
401 if (!perm)
402 return -EPERM;
403 {
404 unsigned int ticks, count;
405
406 /*
407 * Generate the tone for the appropriate number of ticks.
408 * If the time is zero, turn off sound ourselves.
409 */
410 ticks = HZ * ((arg >> 16) & 0xffff) / 1000;
411 count = ticks ? (arg & 0xffff) : 0;
412 if (count)
413 count = CLOCK_TICK_RATE / count;
414 kd_mksound(count, ticks);
415 return 0;
416 }
417
418 case KDGKBTYPE:
419 /*
420 * this is naive.
421 */
422 ucval = KB_101;
423 goto setchar;
424
425 /*
426 * These cannot be implemented on any machine that implements
427 * ioperm() in user level (such as Alpha PCs) or not at all.
428 *
429 * XXX: you should never use these, just call ioperm directly..
430 */
431 #ifdef CONFIG_X86
432 case KDADDIO:
433 case KDDELIO:
434 /*
435 * KDADDIO and KDDELIO may be able to add ports beyond what
436 * we reject here, but to be safe...
437 */
438 if (arg < GPFIRST || arg > GPLAST)
439 return -EINVAL;
440 return sys_ioperm(arg, 1, (cmd == KDADDIO)) ? -ENXIO : 0;
441
442 case KDENABIO:
443 case KDDISABIO:
444 return sys_ioperm(GPFIRST, GPNUM,
445 (cmd == KDENABIO)) ? -ENXIO : 0;
446 #endif
447
448 /* Linux m68k/i386 interface for setting the keyboard delay/repeat rate */
449
450 case KDKBDREP:
451 {
452 struct kbd_repeat kbrep;
453 int err;
454
455 if (!capable(CAP_SYS_TTY_CONFIG))
456 return -EPERM;
457
458 if (copy_from_user(&kbrep, up, sizeof(struct kbd_repeat)))
459 return -EFAULT;
460 err = kbd_rate(&kbrep);
461 if (err)
462 return err;
463 if (copy_to_user(up, &kbrep, sizeof(struct kbd_repeat)))
464 return -EFAULT;
465 return 0;
466 }
467
468 case KDSETMODE:
469 /*
470 * currently, setting the mode from KD_TEXT to KD_GRAPHICS
471 * doesn't do a whole lot. i'm not sure if it should do any
472 * restoration of modes or what...
473 *
474 * XXX It should at least call into the driver, fbdev's definitely
475 * need to restore their engine state. --BenH
476 */
477 if (!perm)
478 return -EPERM;
479 switch (arg) {
480 case KD_GRAPHICS:
481 break;
482 case KD_TEXT0:
483 case KD_TEXT1:
484 arg = KD_TEXT;
485 case KD_TEXT:
486 break;
487 default:
488 return -EINVAL;
489 }
490 if (vc->vc_mode == (unsigned char) arg)
491 return 0;
492 vc->vc_mode = (unsigned char) arg;
493 if (console != fg_console)
494 return 0;
495 /*
496 * explicitly blank/unblank the screen if switching modes
497 */
498 acquire_console_sem();
499 if (arg == KD_TEXT)
500 do_unblank_screen(1);
501 else
502 do_blank_screen(1);
503 release_console_sem();
504 return 0;
505
506 case KDGETMODE:
507 ucval = vc->vc_mode;
508 goto setint;
509
510 case KDMAPDISP:
511 case KDUNMAPDISP:
512 /*
513 * these work like a combination of mmap and KDENABIO.
514 * this could be easily finished.
515 */
516 return -EINVAL;
517
518 case KDSKBMODE:
519 if (!perm)
520 return -EPERM;
521 switch(arg) {
522 case K_RAW:
523 kbd->kbdmode = VC_RAW;
524 break;
525 case K_MEDIUMRAW:
526 kbd->kbdmode = VC_MEDIUMRAW;
527 break;
528 case K_XLATE:
529 kbd->kbdmode = VC_XLATE;
530 compute_shiftstate();
531 break;
532 case K_UNICODE:
533 kbd->kbdmode = VC_UNICODE;
534 compute_shiftstate();
535 break;
536 default:
537 return -EINVAL;
538 }
539 tty_ldisc_flush(tty);
540 return 0;
541
542 case KDGKBMODE:
543 ucval = ((kbd->kbdmode == VC_RAW) ? K_RAW :
544 (kbd->kbdmode == VC_MEDIUMRAW) ? K_MEDIUMRAW :
545 (kbd->kbdmode == VC_UNICODE) ? K_UNICODE :
546 K_XLATE);
547 goto setint;
548
549 /* this could be folded into KDSKBMODE, but for compatibility
550 reasons it is not so easy to fold KDGKBMETA into KDGKBMODE */
551 case KDSKBMETA:
552 switch(arg) {
553 case K_METABIT:
554 clr_vc_kbd_mode(kbd, VC_META);
555 break;
556 case K_ESCPREFIX:
557 set_vc_kbd_mode(kbd, VC_META);
558 break;
559 default:
560 return -EINVAL;
561 }
562 return 0;
563
564 case KDGKBMETA:
565 ucval = (vc_kbd_mode(kbd, VC_META) ? K_ESCPREFIX : K_METABIT);
566 setint:
567 return put_user(ucval, (int __user *)arg);
568
569 case KDGETKEYCODE:
570 case KDSETKEYCODE:
571 if(!capable(CAP_SYS_TTY_CONFIG))
572 perm=0;
573 return do_kbkeycode_ioctl(cmd, up, perm);
574
575 case KDGKBENT:
576 case KDSKBENT:
577 return do_kdsk_ioctl(cmd, up, perm, kbd);
578
579 case KDGKBSENT:
580 case KDSKBSENT:
581 return do_kdgkb_ioctl(cmd, up, perm);
582
583 case KDGKBDIACR:
584 {
585 struct kbdiacrs __user *a = up;
586
587 if (put_user(accent_table_size, &a->kb_cnt))
588 return -EFAULT;
589 if (copy_to_user(a->kbdiacr, accent_table, accent_table_size*sizeof(struct kbdiacr)))
590 return -EFAULT;
591 return 0;
592 }
593
594 case KDSKBDIACR:
595 {
596 struct kbdiacrs __user *a = up;
597 unsigned int ct;
598
599 if (!perm)
600 return -EPERM;
601 if (get_user(ct,&a->kb_cnt))
602 return -EFAULT;
603 if (ct >= MAX_DIACR)
604 return -EINVAL;
605 accent_table_size = ct;
606 if (copy_from_user(accent_table, a->kbdiacr, ct*sizeof(struct kbdiacr)))
607 return -EFAULT;
608 return 0;
609 }
610
611 /* the ioctls below read/set the flags usually shown in the leds */
612 /* don't use them - they will go away without warning */
613 case KDGKBLED:
614 ucval = kbd->ledflagstate | (kbd->default_ledflagstate << 4);
615 goto setchar;
616
617 case KDSKBLED:
618 if (!perm)
619 return -EPERM;
620 if (arg & ~0x77)
621 return -EINVAL;
622 kbd->ledflagstate = (arg & 7);
623 kbd->default_ledflagstate = ((arg >> 4) & 7);
624 set_leds();
625 return 0;
626
627 /* the ioctls below only set the lights, not the functions */
628 /* for those, see KDGKBLED and KDSKBLED above */
629 case KDGETLED:
630 ucval = getledstate();
631 setchar:
632 return put_user(ucval, (char __user *)arg);
633
634 case KDSETLED:
635 if (!perm)
636 return -EPERM;
637 setledstate(kbd, arg);
638 return 0;
639
640 /*
641 * A process can indicate its willingness to accept signals
642 * generated by pressing an appropriate key combination.
643 * Thus, one can have a daemon that e.g. spawns a new console
644 * upon a keypress and then changes to it.
645 * See also the kbrequest field of inittab(5).
646 */
647 case KDSIGACCEPT:
648 {
649 extern int spawnpid, spawnsig;
650 if (!perm || !capable(CAP_KILL))
651 return -EPERM;
652 if (!valid_signal(arg) || arg < 1 || arg == SIGKILL)
653 return -EINVAL;
654 spawnpid = current->pid;
655 spawnsig = arg;
656 return 0;
657 }
658
659 case VT_SETMODE:
660 {
661 struct vt_mode tmp;
662
663 if (!perm)
664 return -EPERM;
665 if (copy_from_user(&tmp, up, sizeof(struct vt_mode)))
666 return -EFAULT;
667 if (tmp.mode != VT_AUTO && tmp.mode != VT_PROCESS)
668 return -EINVAL;
669 acquire_console_sem();
670 vc->vt_mode = tmp;
671 /* the frsig is ignored, so we set it to 0 */
672 vc->vt_mode.frsig = 0;
673 vc->vt_pid = current->pid;
674 /* no switch is required -- saw@shade.msu.ru */
675 vc->vt_newvt = -1;
676 release_console_sem();
677 return 0;
678 }
679
680 case VT_GETMODE:
681 {
682 struct vt_mode tmp;
683 int rc;
684
685 acquire_console_sem();
686 memcpy(&tmp, &vc->vt_mode, sizeof(struct vt_mode));
687 release_console_sem();
688
689 rc = copy_to_user(up, &tmp, sizeof(struct vt_mode));
690 return rc ? -EFAULT : 0;
691 }
692
693 /*
694 * Returns global vt state. Note that VT 0 is always open, since
695 * it's an alias for the current VT, and people can't use it here.
696 * We cannot return state for more than 16 VTs, since v_state is short.
697 */
698 case VT_GETSTATE:
699 {
700 struct vt_stat __user *vtstat = up;
701 unsigned short state, mask;
702
703 if (put_user(fg_console + 1, &vtstat->v_active))
704 return -EFAULT;
705 state = 1; /* /dev/tty0 is always open */
706 for (i = 0, mask = 2; i < MAX_NR_CONSOLES && mask; ++i, mask <<= 1)
707 if (VT_IS_IN_USE(i))
708 state |= mask;
709 return put_user(state, &vtstat->v_state);
710 }
711
712 /*
713 * Returns the first available (non-opened) console.
714 */
715 case VT_OPENQRY:
716 for (i = 0; i < MAX_NR_CONSOLES; ++i)
717 if (! VT_IS_IN_USE(i))
718 break;
719 ucval = i < MAX_NR_CONSOLES ? (i+1) : -1;
720 goto setint;
721
722 /*
723 * ioctl(fd, VT_ACTIVATE, num) will cause us to switch to vt # num,
724 * with num >= 1 (switches to vt 0, our console, are not allowed, just
725 * to preserve sanity).
726 */
727 case VT_ACTIVATE:
728 if (!perm)
729 return -EPERM;
730 if (arg == 0 || arg > MAX_NR_CONSOLES)
731 return -ENXIO;
732 arg--;
733 acquire_console_sem();
734 i = vc_allocate(arg);
735 release_console_sem();
736 if (i)
737 return i;
738 set_console(arg);
739 return 0;
740
741 /*
742 * wait until the specified VT has been activated
743 */
744 case VT_WAITACTIVE:
745 if (!perm)
746 return -EPERM;
747 if (arg == 0 || arg > MAX_NR_CONSOLES)
748 return -ENXIO;
749 return vt_waitactive(arg-1);
750
751 /*
752 * If a vt is under process control, the kernel will not switch to it
753 * immediately, but postpone the operation until the process calls this
754 * ioctl, allowing the switch to complete.
755 *
756 * According to the X sources this is the behavior:
757 * 0: pending switch-from not OK
758 * 1: pending switch-from OK
759 * 2: completed switch-to OK
760 */
761 case VT_RELDISP:
762 if (!perm)
763 return -EPERM;
764 if (vc->vt_mode.mode != VT_PROCESS)
765 return -EINVAL;
766
767 /*
768 * Switching-from response
769 */
770 if (vc->vt_newvt >= 0) {
771 if (arg == 0)
772 /*
773 * Switch disallowed, so forget we were trying
774 * to do it.
775 */
776 vc->vt_newvt = -1;
777
778 else {
779 /*
780 * The current vt has been released, so
781 * complete the switch.
782 */
783 int newvt;
784 acquire_console_sem();
785 newvt = vc->vt_newvt;
786 vc->vt_newvt = -1;
787 i = vc_allocate(newvt);
788 if (i) {
789 release_console_sem();
790 return i;
791 }
792 /*
793 * When we actually do the console switch,
794 * make sure we are atomic with respect to
795 * other console switches..
796 */
797 complete_change_console(vc_cons[newvt].d);
798 release_console_sem();
799 }
800 }
801
802 /*
803 * Switched-to response
804 */
805 else
806 {
807 /*
808 * If it's just an ACK, ignore it
809 */
810 if (arg != VT_ACKACQ)
811 return -EINVAL;
812 }
813
814 return 0;
815
816 /*
817 * Disallocate memory associated to VT (but leave VT1)
818 */
819 case VT_DISALLOCATE:
820 if (arg > MAX_NR_CONSOLES)
821 return -ENXIO;
822 if (arg == 0) {
823 /* disallocate all unused consoles, but leave 0 */
824 acquire_console_sem();
825 for (i=1; i<MAX_NR_CONSOLES; i++)
826 if (! VT_BUSY(i))
827 vc_disallocate(i);
828 release_console_sem();
829 } else {
830 /* disallocate a single console, if possible */
831 arg--;
832 if (VT_BUSY(arg))
833 return -EBUSY;
834 if (arg) { /* leave 0 */
835 acquire_console_sem();
836 vc_disallocate(arg);
837 release_console_sem();
838 }
839 }
840 return 0;
841
842 case VT_RESIZE:
843 {
844 struct vt_sizes __user *vtsizes = up;
845 ushort ll,cc;
846 if (!perm)
847 return -EPERM;
848 if (get_user(ll, &vtsizes->v_rows) ||
849 get_user(cc, &vtsizes->v_cols))
850 return -EFAULT;
851 for (i = 0; i < MAX_NR_CONSOLES; i++) {
852 acquire_console_sem();
853 vc_resize(vc_cons[i].d, cc, ll);
854 release_console_sem();
855 }
856 return 0;
857 }
858
859 case VT_RESIZEX:
860 {
861 struct vt_consize __user *vtconsize = up;
862 ushort ll,cc,vlin,clin,vcol,ccol;
863 if (!perm)
864 return -EPERM;
865 if (!access_ok(VERIFY_READ, vtconsize,
866 sizeof(struct vt_consize)))
867 return -EFAULT;
868 __get_user(ll, &vtconsize->v_rows);
869 __get_user(cc, &vtconsize->v_cols);
870 __get_user(vlin, &vtconsize->v_vlin);
871 __get_user(clin, &vtconsize->v_clin);
872 __get_user(vcol, &vtconsize->v_vcol);
873 __get_user(ccol, &vtconsize->v_ccol);
874 vlin = vlin ? vlin : vc->vc_scan_lines;
875 if (clin) {
876 if (ll) {
877 if (ll != vlin/clin)
878 return -EINVAL; /* Parameters don't add up */
879 } else
880 ll = vlin/clin;
881 }
882 if (vcol && ccol) {
883 if (cc) {
884 if (cc != vcol/ccol)
885 return -EINVAL;
886 } else
887 cc = vcol/ccol;
888 }
889
890 if (clin > 32)
891 return -EINVAL;
892
893 for (i = 0; i < MAX_NR_CONSOLES; i++) {
894 if (!vc_cons[i].d)
895 continue;
896 acquire_console_sem();
897 if (vlin)
898 vc_cons[i].d->vc_scan_lines = vlin;
899 if (clin)
900 vc_cons[i].d->vc_font.height = clin;
901 vc_resize(vc_cons[i].d, cc, ll);
902 release_console_sem();
903 }
904 return 0;
905 }
906
907 case PIO_FONT: {
908 if (!perm)
909 return -EPERM;
910 op.op = KD_FONT_OP_SET;
911 op.flags = KD_FONT_FLAG_OLD | KD_FONT_FLAG_DONT_RECALC; /* Compatibility */
912 op.width = 8;
913 op.height = 0;
914 op.charcount = 256;
915 op.data = up;
916 return con_font_op(vc_cons[fg_console].d, &op);
917 }
918
919 case GIO_FONT: {
920 op.op = KD_FONT_OP_GET;
921 op.flags = KD_FONT_FLAG_OLD;
922 op.width = 8;
923 op.height = 32;
924 op.charcount = 256;
925 op.data = up;
926 return con_font_op(vc_cons[fg_console].d, &op);
927 }
928
929 case PIO_CMAP:
930 if (!perm)
931 return -EPERM;
932 return con_set_cmap(up);
933
934 case GIO_CMAP:
935 return con_get_cmap(up);
936
937 case PIO_FONTX:
938 case GIO_FONTX:
939 return do_fontx_ioctl(cmd, up, perm, &op);
940
941 case PIO_FONTRESET:
942 {
943 if (!perm)
944 return -EPERM;
945
946 #ifdef BROKEN_GRAPHICS_PROGRAMS
947 /* With BROKEN_GRAPHICS_PROGRAMS defined, the default
948 font is not saved. */
949 return -ENOSYS;
950 #else
951 {
952 op.op = KD_FONT_OP_SET_DEFAULT;
953 op.data = NULL;
954 i = con_font_op(vc_cons[fg_console].d, &op);
955 if (i)
956 return i;
957 con_set_default_unimap(vc_cons[fg_console].d);
958 return 0;
959 }
960 #endif
961 }
962
963 case KDFONTOP: {
964 if (copy_from_user(&op, up, sizeof(op)))
965 return -EFAULT;
966 if (!perm && op.op != KD_FONT_OP_GET)
967 return -EPERM;
968 i = con_font_op(vc, &op);
969 if (i) return i;
970 if (copy_to_user(up, &op, sizeof(op)))
971 return -EFAULT;
972 return 0;
973 }
974
975 case PIO_SCRNMAP:
976 if (!perm)
977 return -EPERM;
978 return con_set_trans_old(up);
979
980 case GIO_SCRNMAP:
981 return con_get_trans_old(up);
982
983 case PIO_UNISCRNMAP:
984 if (!perm)
985 return -EPERM;
986 return con_set_trans_new(up);
987
988 case GIO_UNISCRNMAP:
989 return con_get_trans_new(up);
990
991 case PIO_UNIMAPCLR:
992 { struct unimapinit ui;
993 if (!perm)
994 return -EPERM;
995 i = copy_from_user(&ui, up, sizeof(struct unimapinit));
996 if (i) return -EFAULT;
997 con_clear_unimap(vc, &ui);
998 return 0;
999 }
1000
1001 case PIO_UNIMAP:
1002 case GIO_UNIMAP:
1003 return do_unimap_ioctl(cmd, up, perm, vc);
1004
1005 case VT_LOCKSWITCH:
1006 if (!capable(CAP_SYS_TTY_CONFIG))
1007 return -EPERM;
1008 vt_dont_switch = 1;
1009 return 0;
1010 case VT_UNLOCKSWITCH:
1011 if (!capable(CAP_SYS_TTY_CONFIG))
1012 return -EPERM;
1013 vt_dont_switch = 0;
1014 return 0;
1015 default:
1016 return -ENOIOCTLCMD;
1017 }
1018 }
1019
1020 /*
1021 * Sometimes we want to wait until a particular VT has been activated. We
1022 * do it in a very simple manner. Everybody waits on a single queue and
1023 * get woken up at once. Those that are satisfied go on with their business,
1024 * while those not ready go back to sleep. Seems overkill to add a wait
1025 * to each vt just for this - usually this does nothing!
1026 */
1027 static DECLARE_WAIT_QUEUE_HEAD(vt_activate_queue);
1028
1029 /*
1030 * Sleeps until a vt is activated, or the task is interrupted. Returns
1031 * 0 if activation, -EINTR if interrupted.
1032 */
1033 int vt_waitactive(int vt)
1034 {
1035 int retval;
1036 DECLARE_WAITQUEUE(wait, current);
1037
1038 add_wait_queue(&vt_activate_queue, &wait);
1039 for (;;) {
1040 set_current_state(TASK_INTERRUPTIBLE);
1041 retval = 0;
1042 if (vt == fg_console)
1043 break;
1044 retval = -EINTR;
1045 if (signal_pending(current))
1046 break;
1047 schedule();
1048 }
1049 remove_wait_queue(&vt_activate_queue, &wait);
1050 current->state = TASK_RUNNING;
1051 return retval;
1052 }
1053
1054 #define vt_wake_waitactive() wake_up(&vt_activate_queue)
1055
1056 void reset_vc(struct vc_data *vc)
1057 {
1058 vc->vc_mode = KD_TEXT;
1059 kbd_table[vc->vc_num].kbdmode = VC_XLATE;
1060 vc->vt_mode.mode = VT_AUTO;
1061 vc->vt_mode.waitv = 0;
1062 vc->vt_mode.relsig = 0;
1063 vc->vt_mode.acqsig = 0;
1064 vc->vt_mode.frsig = 0;
1065 vc->vt_pid = -1;
1066 vc->vt_newvt = -1;
1067 if (!in_interrupt()) /* Via keyboard.c:SAK() - akpm */
1068 reset_palette(vc);
1069 }
1070
1071 /*
1072 * Performs the back end of a vt switch
1073 */
1074 static void complete_change_console(struct vc_data *vc)
1075 {
1076 unsigned char old_vc_mode;
1077
1078 last_console = fg_console;
1079
1080 /*
1081 * If we're switching, we could be going from KD_GRAPHICS to
1082 * KD_TEXT mode or vice versa, which means we need to blank or
1083 * unblank the screen later.
1084 */
1085 old_vc_mode = vc_cons[fg_console].d->vc_mode;
1086 switch_screen(vc);
1087
1088 /*
1089 * This can't appear below a successful kill_proc(). If it did,
1090 * then the *blank_screen operation could occur while X, having
1091 * received acqsig, is waking up on another processor. This
1092 * condition can lead to overlapping accesses to the VGA range
1093 * and the framebuffer (causing system lockups).
1094 *
1095 * To account for this we duplicate this code below only if the
1096 * controlling process is gone and we've called reset_vc.
1097 */
1098 if (old_vc_mode != vc->vc_mode) {
1099 if (vc->vc_mode == KD_TEXT)
1100 do_unblank_screen(1);
1101 else
1102 do_blank_screen(1);
1103 }
1104
1105 /*
1106 * If this new console is under process control, send it a signal
1107 * telling it that it has acquired. Also check if it has died and
1108 * clean up (similar to logic employed in change_console())
1109 */
1110 if (vc->vt_mode.mode == VT_PROCESS) {
1111 /*
1112 * Send the signal as privileged - kill_proc() will
1113 * tell us if the process has gone or something else
1114 * is awry
1115 */
1116 if (kill_proc(vc->vt_pid, vc->vt_mode.acqsig, 1) != 0) {
1117 /*
1118 * The controlling process has died, so we revert back to
1119 * normal operation. In this case, we'll also change back
1120 * to KD_TEXT mode. I'm not sure if this is strictly correct
1121 * but it saves the agony when the X server dies and the screen
1122 * remains blanked due to KD_GRAPHICS! It would be nice to do
1123 * this outside of VT_PROCESS but there is no single process
1124 * to account for and tracking tty count may be undesirable.
1125 */
1126 reset_vc(vc);
1127
1128 if (old_vc_mode != vc->vc_mode) {
1129 if (vc->vc_mode == KD_TEXT)
1130 do_unblank_screen(1);
1131 else
1132 do_blank_screen(1);
1133 }
1134 }
1135 }
1136
1137 /*
1138 * Wake anyone waiting for their VT to activate
1139 */
1140 vt_wake_waitactive();
1141 return;
1142 }
1143
1144 /*
1145 * Performs the front-end of a vt switch
1146 */
1147 void change_console(struct vc_data *new_vc)
1148 {
1149 struct vc_data *vc;
1150
1151 if (!new_vc || new_vc->vc_num == fg_console || vt_dont_switch)
1152 return;
1153
1154 /*
1155 * If this vt is in process mode, then we need to handshake with
1156 * that process before switching. Essentially, we store where that
1157 * vt wants to switch to and wait for it to tell us when it's done
1158 * (via VT_RELDISP ioctl).
1159 *
1160 * We also check to see if the controlling process still exists.
1161 * If it doesn't, we reset this vt to auto mode and continue.
1162 * This is a cheap way to track process control. The worst thing
1163 * that can happen is: we send a signal to a process, it dies, and
1164 * the switch gets "lost" waiting for a response; hopefully, the
1165 * user will try again, we'll detect the process is gone (unless
1166 * the user waits just the right amount of time :-) and revert the
1167 * vt to auto control.
1168 */
1169 vc = vc_cons[fg_console].d;
1170 if (vc->vt_mode.mode == VT_PROCESS) {
1171 /*
1172 * Send the signal as privileged - kill_proc() will
1173 * tell us if the process has gone or something else
1174 * is awry
1175 */
1176 if (kill_proc(vc->vt_pid, vc->vt_mode.relsig, 1) == 0) {
1177 /*
1178 * It worked. Mark the vt to switch to and
1179 * return. The process needs to send us a
1180 * VT_RELDISP ioctl to complete the switch.
1181 */
1182 vc->vt_newvt = new_vc->vc_num;
1183 return;
1184 }
1185
1186 /*
1187 * The controlling process has died, so we revert back to
1188 * normal operation. In this case, we'll also change back
1189 * to KD_TEXT mode. I'm not sure if this is strictly correct
1190 * but it saves the agony when the X server dies and the screen
1191 * remains blanked due to KD_GRAPHICS! It would be nice to do
1192 * this outside of VT_PROCESS but there is no single process
1193 * to account for and tracking tty count may be undesirable.
1194 */
1195 reset_vc(vc);
1196
1197 /*
1198 * Fall through to normal (VT_AUTO) handling of the switch...
1199 */
1200 }
1201
1202 /*
1203 * Ignore all switches in KD_GRAPHICS+VT_AUTO mode
1204 */
1205 if (vc->vc_mode == KD_GRAPHICS)
1206 return;
1207
1208 complete_change_console(new_vc);
1209 }
SocketAccessConTroL development