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[XFS] fix unaligned access in readdir
[wrt350n-kernel.git] / drivers / char / vt_ioctl.c
blobe6f89e8b9258429fc99754ec492918d94089bcfd
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
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 struct kbdiacr diacr;
587 int i;
588
589 if (put_user(accent_table_size, &a->kb_cnt))
590 return -EFAULT;
591 for (i = 0; i < accent_table_size; i++) {
592 diacr.diacr = conv_uni_to_8bit(accent_table[i].diacr);
593 diacr.base = conv_uni_to_8bit(accent_table[i].base);
594 diacr.result = conv_uni_to_8bit(accent_table[i].result);
595 if (copy_to_user(a->kbdiacr + i, &diacr, sizeof(struct kbdiacr)))
596 return -EFAULT;
597 }
598 return 0;
599 }
600 case KDGKBDIACRUC:
601 {
602 struct kbdiacrsuc __user *a = up;
603
604 if (put_user(accent_table_size, &a->kb_cnt))
605 return -EFAULT;
606 if (copy_to_user(a->kbdiacruc, accent_table, accent_table_size*sizeof(struct kbdiacruc)))
607 return -EFAULT;
608 return 0;
609 }
610
611 case KDSKBDIACR:
612 {
613 struct kbdiacrs __user *a = up;
614 struct kbdiacr diacr;
615 unsigned int ct;
616 int i;
617
618 if (!perm)
619 return -EPERM;
620 if (get_user(ct,&a->kb_cnt))
621 return -EFAULT;
622 if (ct >= MAX_DIACR)
623 return -EINVAL;
624 accent_table_size = ct;
625 for (i = 0; i < ct; i++) {
626 if (copy_from_user(&diacr, a->kbdiacr + i, sizeof(struct kbdiacr)))
627 return -EFAULT;
628 accent_table[i].diacr = conv_8bit_to_uni(diacr.diacr);
629 accent_table[i].base = conv_8bit_to_uni(diacr.base);
630 accent_table[i].result = conv_8bit_to_uni(diacr.result);
631 }
632 return 0;
633 }
634
635 case KDSKBDIACRUC:
636 {
637 struct kbdiacrsuc __user *a = up;
638 unsigned int ct;
639
640 if (!perm)
641 return -EPERM;
642 if (get_user(ct,&a->kb_cnt))
643 return -EFAULT;
644 if (ct >= MAX_DIACR)
645 return -EINVAL;
646 accent_table_size = ct;
647 if (copy_from_user(accent_table, a->kbdiacruc, ct*sizeof(struct kbdiacruc)))
648 return -EFAULT;
649 return 0;
650 }
651
652 /* the ioctls below read/set the flags usually shown in the leds */
653 /* don't use them - they will go away without warning */
654 case KDGKBLED:
655 ucval = kbd->ledflagstate | (kbd->default_ledflagstate << 4);
656 goto setchar;
657
658 case KDSKBLED:
659 if (!perm)
660 return -EPERM;
661 if (arg & ~0x77)
662 return -EINVAL;
663 kbd->ledflagstate = (arg & 7);
664 kbd->default_ledflagstate = ((arg >> 4) & 7);
665 set_leds();
666 return 0;
667
668 /* the ioctls below only set the lights, not the functions */
669 /* for those, see KDGKBLED and KDSKBLED above */
670 case KDGETLED:
671 ucval = getledstate();
672 setchar:
673 return put_user(ucval, (char __user *)arg);
674
675 case KDSETLED:
676 if (!perm)
677 return -EPERM;
678 setledstate(kbd, arg);
679 return 0;
680
681 /*
682 * A process can indicate its willingness to accept signals
683 * generated by pressing an appropriate key combination.
684 * Thus, one can have a daemon that e.g. spawns a new console
685 * upon a keypress and then changes to it.
686 * See also the kbrequest field of inittab(5).
687 */
688 case KDSIGACCEPT:
689 {
690 if (!perm || !capable(CAP_KILL))
691 return -EPERM;
692 if (!valid_signal(arg) || arg < 1 || arg == SIGKILL)
693 return -EINVAL;
694
695 spin_lock_irq(&vt_spawn_con.lock);
696 put_pid(vt_spawn_con.pid);
697 vt_spawn_con.pid = get_pid(task_pid(current));
698 vt_spawn_con.sig = arg;
699 spin_unlock_irq(&vt_spawn_con.lock);
700 return 0;
701 }
702
703 case VT_SETMODE:
704 {
705 struct vt_mode tmp;
706
707 if (!perm)
708 return -EPERM;
709 if (copy_from_user(&tmp, up, sizeof(struct vt_mode)))
710 return -EFAULT;
711 if (tmp.mode != VT_AUTO && tmp.mode != VT_PROCESS)
712 return -EINVAL;
713 acquire_console_sem();
714 vc->vt_mode = tmp;
715 /* the frsig is ignored, so we set it to 0 */
716 vc->vt_mode.frsig = 0;
717 put_pid(vc->vt_pid);
718 vc->vt_pid = get_pid(task_pid(current));
719 /* no switch is required -- saw@shade.msu.ru */
720 vc->vt_newvt = -1;
721 release_console_sem();
722 return 0;
723 }
724
725 case VT_GETMODE:
726 {
727 struct vt_mode tmp;
728 int rc;
729
730 acquire_console_sem();
731 memcpy(&tmp, &vc->vt_mode, sizeof(struct vt_mode));
732 release_console_sem();
733
734 rc = copy_to_user(up, &tmp, sizeof(struct vt_mode));
735 return rc ? -EFAULT : 0;
736 }
737
738 /*
739 * Returns global vt state. Note that VT 0 is always open, since
740 * it's an alias for the current VT, and people can't use it here.
741 * We cannot return state for more than 16 VTs, since v_state is short.
742 */
743 case VT_GETSTATE:
744 {
745 struct vt_stat __user *vtstat = up;
746 unsigned short state, mask;
747
748 if (put_user(fg_console + 1, &vtstat->v_active))
749 return -EFAULT;
750 state = 1; /* /dev/tty0 is always open */
751 for (i = 0, mask = 2; i < MAX_NR_CONSOLES && mask; ++i, mask <<= 1)
752 if (VT_IS_IN_USE(i))
753 state |= mask;
754 return put_user(state, &vtstat->v_state);
755 }
756
757 /*
758 * Returns the first available (non-opened) console.
759 */
760 case VT_OPENQRY:
761 for (i = 0; i < MAX_NR_CONSOLES; ++i)
762 if (! VT_IS_IN_USE(i))
763 break;
764 ucval = i < MAX_NR_CONSOLES ? (i+1) : -1;
765 goto setint;
766
767 /*
768 * ioctl(fd, VT_ACTIVATE, num) will cause us to switch to vt # num,
769 * with num >= 1 (switches to vt 0, our console, are not allowed, just
770 * to preserve sanity).
771 */
772 case VT_ACTIVATE:
773 if (!perm)
774 return -EPERM;
775 if (arg == 0 || arg > MAX_NR_CONSOLES)
776 return -ENXIO;
777 arg--;
778 acquire_console_sem();
779 i = vc_allocate(arg);
780 release_console_sem();
781 if (i)
782 return i;
783 set_console(arg);
784 return 0;
785
786 /*
787 * wait until the specified VT has been activated
788 */
789 case VT_WAITACTIVE:
790 if (!perm)
791 return -EPERM;
792 if (arg == 0 || arg > MAX_NR_CONSOLES)
793 return -ENXIO;
794 return vt_waitactive(arg-1);
795
796 /*
797 * If a vt is under process control, the kernel will not switch to it
798 * immediately, but postpone the operation until the process calls this
799 * ioctl, allowing the switch to complete.
800 *
801 * According to the X sources this is the behavior:
802 * 0: pending switch-from not OK
803 * 1: pending switch-from OK
804 * 2: completed switch-to OK
805 */
806 case VT_RELDISP:
807 if (!perm)
808 return -EPERM;
809 if (vc->vt_mode.mode != VT_PROCESS)
810 return -EINVAL;
811
812 /*
813 * Switching-from response
814 */
815 acquire_console_sem();
816 if (vc->vt_newvt >= 0) {
817 if (arg == 0)
818 /*
819 * Switch disallowed, so forget we were trying
820 * to do it.
821 */
822 vc->vt_newvt = -1;
823
824 else {
825 /*
826 * The current vt has been released, so
827 * complete the switch.
828 */
829 int newvt;
830 newvt = vc->vt_newvt;
831 vc->vt_newvt = -1;
832 i = vc_allocate(newvt);
833 if (i) {
834 release_console_sem();
835 return i;
836 }
837 /*
838 * When we actually do the console switch,
839 * make sure we are atomic with respect to
840 * other console switches..
841 */
842 complete_change_console(vc_cons[newvt].d);
843 }
844 }
845
846 /*
847 * Switched-to response
848 */
849 else
850 {
851 /*
852 * If it's just an ACK, ignore it
853 */
854 if (arg != VT_ACKACQ) {
855 release_console_sem();
856 return -EINVAL;
857 }
858 }
859 release_console_sem();
860
861 return 0;
862
863 /*
864 * Disallocate memory associated to VT (but leave VT1)
865 */
866 case VT_DISALLOCATE:
867 if (arg > MAX_NR_CONSOLES)
868 return -ENXIO;
869 if (arg == 0) {
870 /* deallocate all unused consoles, but leave 0 */
871 acquire_console_sem();
872 for (i=1; i<MAX_NR_CONSOLES; i++)
873 if (! VT_BUSY(i))
874 vc_deallocate(i);
875 release_console_sem();
876 } else {
877 /* deallocate a single console, if possible */
878 arg--;
879 if (VT_BUSY(arg))
880 return -EBUSY;
881 if (arg) { /* leave 0 */
882 acquire_console_sem();
883 vc_deallocate(arg);
884 release_console_sem();
885 }
886 }
887 return 0;
888
889 case VT_RESIZE:
890 {
891 struct vt_sizes __user *vtsizes = up;
892 struct vc_data *vc;
893
894 ushort ll,cc;
895 if (!perm)
896 return -EPERM;
897 if (get_user(ll, &vtsizes->v_rows) ||
898 get_user(cc, &vtsizes->v_cols))
899 return -EFAULT;
900
901 for (i = 0; i < MAX_NR_CONSOLES; i++) {
902 vc = vc_cons[i].d;
903
904 if (vc) {
905 vc->vc_resize_user = 1;
906 vc_lock_resize(vc_cons[i].d, cc, ll);
907 }
908 }
909
910 return 0;
911 }
912
913 case VT_RESIZEX:
914 {
915 struct vt_consize __user *vtconsize = up;
916 ushort ll,cc,vlin,clin,vcol,ccol;
917 if (!perm)
918 return -EPERM;
919 if (!access_ok(VERIFY_READ, vtconsize,
920 sizeof(struct vt_consize)))
921 return -EFAULT;
922 __get_user(ll, &vtconsize->v_rows);
923 __get_user(cc, &vtconsize->v_cols);
924 __get_user(vlin, &vtconsize->v_vlin);
925 __get_user(clin, &vtconsize->v_clin);
926 __get_user(vcol, &vtconsize->v_vcol);
927 __get_user(ccol, &vtconsize->v_ccol);
928 vlin = vlin ? vlin : vc->vc_scan_lines;
929 if (clin) {
930 if (ll) {
931 if (ll != vlin/clin)
932 return -EINVAL; /* Parameters don't add up */
933 } else
934 ll = vlin/clin;
935 }
936 if (vcol && ccol) {
937 if (cc) {
938 if (cc != vcol/ccol)
939 return -EINVAL;
940 } else
941 cc = vcol/ccol;
942 }
943
944 if (clin > 32)
945 return -EINVAL;
946
947 for (i = 0; i < MAX_NR_CONSOLES; i++) {
948 if (!vc_cons[i].d)
949 continue;
950 acquire_console_sem();
951 if (vlin)
952 vc_cons[i].d->vc_scan_lines = vlin;
953 if (clin)
954 vc_cons[i].d->vc_font.height = clin;
955 vc_cons[i].d->vc_resize_user = 1;
956 vc_resize(vc_cons[i].d, cc, ll);
957 release_console_sem();
958 }
959 return 0;
960 }
961
962 case PIO_FONT: {
963 if (!perm)
964 return -EPERM;
965 op.op = KD_FONT_OP_SET;
966 op.flags = KD_FONT_FLAG_OLD | KD_FONT_FLAG_DONT_RECALC; /* Compatibility */
967 op.width = 8;
968 op.height = 0;
969 op.charcount = 256;
970 op.data = up;
971 return con_font_op(vc_cons[fg_console].d, &op);
972 }
973
974 case GIO_FONT: {
975 op.op = KD_FONT_OP_GET;
976 op.flags = KD_FONT_FLAG_OLD;
977 op.width = 8;
978 op.height = 32;
979 op.charcount = 256;
980 op.data = up;
981 return con_font_op(vc_cons[fg_console].d, &op);
982 }
983
984 case PIO_CMAP:
985 if (!perm)
986 return -EPERM;
987 return con_set_cmap(up);
988
989 case GIO_CMAP:
990 return con_get_cmap(up);
991
992 case PIO_FONTX:
993 case GIO_FONTX:
994 return do_fontx_ioctl(cmd, up, perm, &op);
995
996 case PIO_FONTRESET:
997 {
998 if (!perm)
999 return -EPERM;
1000
1001 #ifdef BROKEN_GRAPHICS_PROGRAMS
1002 /* With BROKEN_GRAPHICS_PROGRAMS defined, the default
1003 font is not saved. */
1004 return -ENOSYS;
1005 #else
1006 {
1007 op.op = KD_FONT_OP_SET_DEFAULT;
1008 op.data = NULL;
1009 i = con_font_op(vc_cons[fg_console].d, &op);
1010 if (i)
1011 return i;
1012 con_set_default_unimap(vc_cons[fg_console].d);
1013 return 0;
1014 }
1015 #endif
1016 }
1017
1018 case KDFONTOP: {
1019 if (copy_from_user(&op, up, sizeof(op)))
1020 return -EFAULT;
1021 if (!perm && op.op != KD_FONT_OP_GET)
1022 return -EPERM;
1023 i = con_font_op(vc, &op);
1024 if (i) return i;
1025 if (copy_to_user(up, &op, sizeof(op)))
1026 return -EFAULT;
1027 return 0;
1028 }
1029
1030 case PIO_SCRNMAP:
1031 if (!perm)
1032 return -EPERM;
1033 return con_set_trans_old(up);
1034
1035 case GIO_SCRNMAP:
1036 return con_get_trans_old(up);
1037
1038 case PIO_UNISCRNMAP:
1039 if (!perm)
1040 return -EPERM;
1041 return con_set_trans_new(up);
1042
1043 case GIO_UNISCRNMAP:
1044 return con_get_trans_new(up);
1045
1046 case PIO_UNIMAPCLR:
1047 { struct unimapinit ui;
1048 if (!perm)
1049 return -EPERM;
1050 i = copy_from_user(&ui, up, sizeof(struct unimapinit));
1051 if (i) return -EFAULT;
1052 con_clear_unimap(vc, &ui);
1053 return 0;
1054 }
1055
1056 case PIO_UNIMAP:
1057 case GIO_UNIMAP:
1058 return do_unimap_ioctl(cmd, up, perm, vc);
1059
1060 case VT_LOCKSWITCH:
1061 if (!capable(CAP_SYS_TTY_CONFIG))
1062 return -EPERM;
1063 vt_dont_switch = 1;
1064 return 0;
1065 case VT_UNLOCKSWITCH:
1066 if (!capable(CAP_SYS_TTY_CONFIG))
1067 return -EPERM;
1068 vt_dont_switch = 0;
1069 return 0;
1070 case VT_GETHIFONTMASK:
1071 return put_user(vc->vc_hi_font_mask, (unsigned short __user *)arg);
1072 default:
1073 return -ENOIOCTLCMD;
1074 }
1075 }
1076
1077 /*
1078 * Sometimes we want to wait until a particular VT has been activated. We
1079 * do it in a very simple manner. Everybody waits on a single queue and
1080 * get woken up at once. Those that are satisfied go on with their business,
1081 * while those not ready go back to sleep. Seems overkill to add a wait
1082 * to each vt just for this - usually this does nothing!
1083 */
1084 static DECLARE_WAIT_QUEUE_HEAD(vt_activate_queue);
1085
1086 /*
1087 * Sleeps until a vt is activated, or the task is interrupted. Returns
1088 * 0 if activation, -EINTR if interrupted by a signal handler.
1089 */
1090 int vt_waitactive(int vt)
1091 {
1092 int retval;
1093 DECLARE_WAITQUEUE(wait, current);
1094
1095 add_wait_queue(&vt_activate_queue, &wait);
1096 for (;;) {
1097 retval = 0;
1098
1099 /*
1100 * Synchronize with redraw_screen(). By acquiring the console
1101 * semaphore we make sure that the console switch is completed
1102 * before we return. If we didn't wait for the semaphore, we
1103 * could return at a point where fg_console has already been
1104 * updated, but the console switch hasn't been completed.
1105 */
1106 acquire_console_sem();
1107 set_current_state(TASK_INTERRUPTIBLE);
1108 if (vt == fg_console) {
1109 release_console_sem();
1110 break;
1111 }
1112 release_console_sem();
1113 retval = -ERESTARTNOHAND;
1114 if (signal_pending(current))
1115 break;
1116 schedule();
1117 }
1118 remove_wait_queue(&vt_activate_queue, &wait);
1119 __set_current_state(TASK_RUNNING);
1120 return retval;
1121 }
1122
1123 #define vt_wake_waitactive() wake_up(&vt_activate_queue)
1124
1125 void reset_vc(struct vc_data *vc)
1126 {
1127 vc->vc_mode = KD_TEXT;
1128 kbd_table[vc->vc_num].kbdmode = default_utf8 ? VC_UNICODE : VC_XLATE;
1129 vc->vt_mode.mode = VT_AUTO;
1130 vc->vt_mode.waitv = 0;
1131 vc->vt_mode.relsig = 0;
1132 vc->vt_mode.acqsig = 0;
1133 vc->vt_mode.frsig = 0;
1134 put_pid(vc->vt_pid);
1135 vc->vt_pid = NULL;
1136 vc->vt_newvt = -1;
1137 if (!in_interrupt()) /* Via keyboard.c:SAK() - akpm */
1138 reset_palette(vc);
1139 }
1140
1141 void vc_SAK(struct work_struct *work)
1142 {
1143 struct vc *vc_con =
1144 container_of(work, struct vc, SAK_work);
1145 struct vc_data *vc;
1146 struct tty_struct *tty;
1147
1148 acquire_console_sem();
1149 vc = vc_con->d;
1150 if (vc) {
1151 tty = vc->vc_tty;
1152 /*
1153 * SAK should also work in all raw modes and reset
1154 * them properly.
1155 */
1156 if (tty)
1157 __do_SAK(tty);
1158 reset_vc(vc);
1159 }
1160 release_console_sem();
1161 }
1162
1163 /*
1164 * Performs the back end of a vt switch
1165 */
1166 static void complete_change_console(struct vc_data *vc)
1167 {
1168 unsigned char old_vc_mode;
1169
1170 last_console = fg_console;
1171
1172 /*
1173 * If we're switching, we could be going from KD_GRAPHICS to
1174 * KD_TEXT mode or vice versa, which means we need to blank or
1175 * unblank the screen later.
1176 */
1177 old_vc_mode = vc_cons[fg_console].d->vc_mode;
1178 switch_screen(vc);
1179
1180 /*
1181 * This can't appear below a successful kill_pid(). If it did,
1182 * then the *blank_screen operation could occur while X, having
1183 * received acqsig, is waking up on another processor. This
1184 * condition can lead to overlapping accesses to the VGA range
1185 * and the framebuffer (causing system lockups).
1186 *
1187 * To account for this we duplicate this code below only if the
1188 * controlling process is gone and we've called reset_vc.
1189 */
1190 if (old_vc_mode != vc->vc_mode) {
1191 if (vc->vc_mode == KD_TEXT)
1192 do_unblank_screen(1);
1193 else
1194 do_blank_screen(1);
1195 }
1196
1197 /*
1198 * If this new console is under process control, send it a signal
1199 * telling it that it has acquired. Also check if it has died and
1200 * clean up (similar to logic employed in change_console())
1201 */
1202 if (vc->vt_mode.mode == VT_PROCESS) {
1203 /*
1204 * Send the signal as privileged - kill_pid() will
1205 * tell us if the process has gone or something else
1206 * is awry
1207 */
1208 if (kill_pid(vc->vt_pid, vc->vt_mode.acqsig, 1) != 0) {
1209 /*
1210 * The controlling process has died, so we revert back to
1211 * normal operation. In this case, we'll also change back
1212 * to KD_TEXT mode. I'm not sure if this is strictly correct
1213 * but it saves the agony when the X server dies and the screen
1214 * remains blanked due to KD_GRAPHICS! It would be nice to do
1215 * this outside of VT_PROCESS but there is no single process
1216 * to account for and tracking tty count may be undesirable.
1217 */
1218 reset_vc(vc);
1219
1220 if (old_vc_mode != vc->vc_mode) {
1221 if (vc->vc_mode == KD_TEXT)
1222 do_unblank_screen(1);
1223 else
1224 do_blank_screen(1);
1225 }
1226 }
1227 }
1228
1229 /*
1230 * Wake anyone waiting for their VT to activate
1231 */
1232 vt_wake_waitactive();
1233 return;
1234 }
1235
1236 /*
1237 * Performs the front-end of a vt switch
1238 */
1239 void change_console(struct vc_data *new_vc)
1240 {
1241 struct vc_data *vc;
1242
1243 if (!new_vc || new_vc->vc_num == fg_console || vt_dont_switch)
1244 return;
1245
1246 /*
1247 * If this vt is in process mode, then we need to handshake with
1248 * that process before switching. Essentially, we store where that
1249 * vt wants to switch to and wait for it to tell us when it's done
1250 * (via VT_RELDISP ioctl).
1251 *
1252 * We also check to see if the controlling process still exists.
1253 * If it doesn't, we reset this vt to auto mode and continue.
1254 * This is a cheap way to track process control. The worst thing
1255 * that can happen is: we send a signal to a process, it dies, and
1256 * the switch gets "lost" waiting for a response; hopefully, the
1257 * user will try again, we'll detect the process is gone (unless
1258 * the user waits just the right amount of time :-) and revert the
1259 * vt to auto control.
1260 */
1261 vc = vc_cons[fg_console].d;
1262 if (vc->vt_mode.mode == VT_PROCESS) {
1263 /*
1264 * Send the signal as privileged - kill_pid() will
1265 * tell us if the process has gone or something else
1266 * is awry.
1267 *
1268 * We need to set vt_newvt *before* sending the signal or we
1269 * have a race.
1270 */
1271 vc->vt_newvt = new_vc->vc_num;
1272 if (kill_pid(vc->vt_pid, vc->vt_mode.relsig, 1) == 0) {
1273 /*
1274 * It worked. Mark the vt to switch to and
1275 * return. The process needs to send us a
1276 * VT_RELDISP ioctl to complete the switch.
1277 */
1278 return;
1279 }
1280
1281 /*
1282 * The controlling process has died, so we revert back to
1283 * normal operation. In this case, we'll also change back
1284 * to KD_TEXT mode. I'm not sure if this is strictly correct
1285 * but it saves the agony when the X server dies and the screen
1286 * remains blanked due to KD_GRAPHICS! It would be nice to do
1287 * this outside of VT_PROCESS but there is no single process
1288 * to account for and tracking tty count may be undesirable.
1289 */
1290 reset_vc(vc);
1291
1292 /*
1293 * Fall through to normal (VT_AUTO) handling of the switch...
1294 */
1295 }
1296
1297 /*
1298 * Ignore all switches in KD_GRAPHICS+VT_AUTO mode
1299 */
1300 if (vc->vc_mode == KD_GRAPHICS)
1301 return;
1302
1303 complete_change_console(new_vc);
1304 }
WRT350N Kernel Patches