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V4L/DVB: v4l2-ioctl: integer overflow in video_usercopy()
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / char / vt_ioctl.c
blob6351a2625dfe3783d7eac259a4d5e89548a34594
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/compat.h>
20 #include <linux/module.h>
21 #include <linux/kd.h>
22 #include <linux/vt.h>
23 #include <linux/string.h>
24 #include <linux/slab.h>
25 #include <linux/major.h>
26 #include <linux/fs.h>
27 #include <linux/console.h>
28 #include <linux/consolemap.h>
29 #include <linux/signal.h>
30 #include <linux/smp_lock.h>
31 #include <linux/timex.h>
32
33 #include <asm/io.h>
34 #include <asm/uaccess.h>
35
36 #include <linux/kbd_kern.h>
37 #include <linux/vt_kern.h>
38 #include <linux/kbd_diacr.h>
39 #include <linux/selection.h>
40
41 char vt_dont_switch;
42 extern struct tty_driver *console_driver;
43
44 #define VT_IS_IN_USE(i) (console_driver->ttys[i] && console_driver->ttys[i]->count)
45 #define VT_BUSY(i) (VT_IS_IN_USE(i) || i == fg_console || vc_cons[i].d == sel_cons)
46
47 /*
48 * Console (vt and kd) routines, as defined by USL SVR4 manual, and by
49 * experimentation and study of X386 SYSV handling.
50 *
51 * One point of difference: SYSV vt's are /dev/vtX, which X >= 0, and
52 * /dev/console is a separate ttyp. Under Linux, /dev/tty0 is /dev/console,
53 * and the vc start at /dev/ttyX, X >= 1. We maintain that here, so we will
54 * always treat our set of vt as numbered 1..MAX_NR_CONSOLES (corresponding to
55 * ttys 0..MAX_NR_CONSOLES-1). Explicitly naming VT 0 is illegal, but using
56 * /dev/tty0 (fg_console) as a target is legal, since an implicit aliasing
57 * to the current console is done by the main ioctl code.
58 */
59
60 #ifdef CONFIG_X86
61 #include <linux/syscalls.h>
62 #endif
63
64 static void complete_change_console(struct vc_data *vc);
65
66 /*
67 * User space VT_EVENT handlers
68 */
69
70 struct vt_event_wait {
71 struct list_head list;
72 struct vt_event event;
73 int done;
74 };
75
76 static LIST_HEAD(vt_events);
77 static DEFINE_SPINLOCK(vt_event_lock);
78 static DECLARE_WAIT_QUEUE_HEAD(vt_event_waitqueue);
79
80 /**
81 * vt_event_post
82 * @event: the event that occurred
83 * @old: old console
84 * @new: new console
85 *
86 * Post an VT event to interested VT handlers
87 */
88
89 void vt_event_post(unsigned int event, unsigned int old, unsigned int new)
90 {
91 struct list_head *pos, *head;
92 unsigned long flags;
93 int wake = 0;
94
95 spin_lock_irqsave(&vt_event_lock, flags);
96 head = &vt_events;
97
98 list_for_each(pos, head) {
99 struct vt_event_wait *ve = list_entry(pos,
100 struct vt_event_wait, list);
101 if (!(ve->event.event & event))
102 continue;
103 ve->event.event = event;
104 /* kernel view is consoles 0..n-1, user space view is
105 console 1..n with 0 meaning current, so we must bias */
106 ve->event.oldev = old + 1;
107 ve->event.newev = new + 1;
108 wake = 1;
109 ve->done = 1;
110 }
111 spin_unlock_irqrestore(&vt_event_lock, flags);
112 if (wake)
113 wake_up_interruptible(&vt_event_waitqueue);
114 }
115
116 /**
117 * vt_event_wait - wait for an event
118 * @vw: our event
119 *
120 * Waits for an event to occur which completes our vt_event_wait
121 * structure. On return the structure has wv->done set to 1 for success
122 * or 0 if some event such as a signal ended the wait.
123 */
124
125 static void vt_event_wait(struct vt_event_wait *vw)
126 {
127 unsigned long flags;
128 /* Prepare the event */
129 INIT_LIST_HEAD(&vw->list);
130 vw->done = 0;
131 /* Queue our event */
132 spin_lock_irqsave(&vt_event_lock, flags);
133 list_add(&vw->list, &vt_events);
134 spin_unlock_irqrestore(&vt_event_lock, flags);
135 /* Wait for it to pass */
136 wait_event_interruptible(vt_event_waitqueue, vw->done);
137 /* Dequeue it */
138 spin_lock_irqsave(&vt_event_lock, flags);
139 list_del(&vw->list);
140 spin_unlock_irqrestore(&vt_event_lock, flags);
141 }
142
143 /**
144 * vt_event_wait_ioctl - event ioctl handler
145 * @arg: argument to ioctl
146 *
147 * Implement the VT_WAITEVENT ioctl using the VT event interface
148 */
149
150 static int vt_event_wait_ioctl(struct vt_event __user *event)
151 {
152 struct vt_event_wait vw;
153
154 if (copy_from_user(&vw.event, event, sizeof(struct vt_event)))
155 return -EFAULT;
156 /* Highest supported event for now */
157 if (vw.event.event & ~VT_MAX_EVENT)
158 return -EINVAL;
159
160 vt_event_wait(&vw);
161 /* If it occurred report it */
162 if (vw.done) {
163 if (copy_to_user(event, &vw.event, sizeof(struct vt_event)))
164 return -EFAULT;
165 return 0;
166 }
167 return -EINTR;
168 }
169
170 /**
171 * vt_waitactive - active console wait
172 * @event: event code
173 * @n: new console
174 *
175 * Helper for event waits. Used to implement the legacy
176 * event waiting ioctls in terms of events
177 */
178
179 int vt_waitactive(int n)
180 {
181 struct vt_event_wait vw;
182 do {
183 if (n == fg_console + 1)
184 break;
185 vw.event.event = VT_EVENT_SWITCH;
186 vt_event_wait(&vw);
187 if (vw.done == 0)
188 return -EINTR;
189 } while (vw.event.newev != n);
190 return 0;
191 }
192
193 /*
194 * these are the valid i/o ports we're allowed to change. they map all the
195 * video ports
196 */
197 #define GPFIRST 0x3b4
198 #define GPLAST 0x3df
199 #define GPNUM (GPLAST - GPFIRST + 1)
200
201 #define i (tmp.kb_index)
202 #define s (tmp.kb_table)
203 #define v (tmp.kb_value)
204 static inline int
205 do_kdsk_ioctl(int cmd, struct kbentry __user *user_kbe, int perm, struct kbd_struct *kbd)
206 {
207 struct kbentry tmp;
208 ushort *key_map, val, ov;
209
210 if (copy_from_user(&tmp, user_kbe, sizeof(struct kbentry)))
211 return -EFAULT;
212
213 if (!capable(CAP_SYS_TTY_CONFIG))
214 perm = 0;
215
216 switch (cmd) {
217 case KDGKBENT:
218 key_map = key_maps[s];
219 if (key_map) {
220 val = U(key_map[i]);
221 if (kbd->kbdmode != VC_UNICODE && KTYP(val) >= NR_TYPES)
222 val = K_HOLE;
223 } else
224 val = (i ? K_HOLE : K_NOSUCHMAP);
225 return put_user(val, &user_kbe->kb_value);
226 case KDSKBENT:
227 if (!perm)
228 return -EPERM;
229 if (!i && v == K_NOSUCHMAP) {
230 /* deallocate map */
231 key_map = key_maps[s];
232 if (s && key_map) {
233 key_maps[s] = NULL;
234 if (key_map[0] == U(K_ALLOCATED)) {
235 kfree(key_map);
236 keymap_count--;
237 }
238 }
239 break;
240 }
241
242 if (KTYP(v) < NR_TYPES) {
243 if (KVAL(v) > max_vals[KTYP(v)])
244 return -EINVAL;
245 } else
246 if (kbd->kbdmode != VC_UNICODE)
247 return -EINVAL;
248
249 /* ++Geert: non-PC keyboards may generate keycode zero */
250 #if !defined(__mc68000__) && !defined(__powerpc__)
251 /* assignment to entry 0 only tests validity of args */
252 if (!i)
253 break;
254 #endif
255
256 if (!(key_map = key_maps[s])) {
257 int j;
258
259 if (keymap_count >= MAX_NR_OF_USER_KEYMAPS &&
260 !capable(CAP_SYS_RESOURCE))
261 return -EPERM;
262
263 key_map = kmalloc(sizeof(plain_map),
264 GFP_KERNEL);
265 if (!key_map)
266 return -ENOMEM;
267 key_maps[s] = key_map;
268 key_map[0] = U(K_ALLOCATED);
269 for (j = 1; j < NR_KEYS; j++)
270 key_map[j] = U(K_HOLE);
271 keymap_count++;
272 }
273 ov = U(key_map[i]);
274 if (v == ov)
275 break; /* nothing to do */
276 /*
277 * Attention Key.
278 */
279 if (((ov == K_SAK) || (v == K_SAK)) && !capable(CAP_SYS_ADMIN))
280 return -EPERM;
281 key_map[i] = U(v);
282 if (!s && (KTYP(ov) == KT_SHIFT || KTYP(v) == KT_SHIFT))
283 compute_shiftstate();
284 break;
285 }
286 return 0;
287 }
288 #undef i
289 #undef s
290 #undef v
291
292 static inline int
293 do_kbkeycode_ioctl(int cmd, struct kbkeycode __user *user_kbkc, int perm)
294 {
295 struct kbkeycode tmp;
296 int kc = 0;
297
298 if (copy_from_user(&tmp, user_kbkc, sizeof(struct kbkeycode)))
299 return -EFAULT;
300 switch (cmd) {
301 case KDGETKEYCODE:
302 kc = getkeycode(tmp.scancode);
303 if (kc >= 0)
304 kc = put_user(kc, &user_kbkc->keycode);
305 break;
306 case KDSETKEYCODE:
307 if (!perm)
308 return -EPERM;
309 kc = setkeycode(tmp.scancode, tmp.keycode);
310 break;
311 }
312 return kc;
313 }
314
315 static inline int
316 do_kdgkb_ioctl(int cmd, struct kbsentry __user *user_kdgkb, int perm)
317 {
318 struct kbsentry *kbs;
319 char *p;
320 u_char *q;
321 u_char __user *up;
322 int sz;
323 int delta;
324 char *first_free, *fj, *fnw;
325 int i, j, k;
326 int ret;
327
328 if (!capable(CAP_SYS_TTY_CONFIG))
329 perm = 0;
330
331 kbs = kmalloc(sizeof(*kbs), GFP_KERNEL);
332 if (!kbs) {
333 ret = -ENOMEM;
334 goto reterr;
335 }
336
337 /* we mostly copy too much here (512bytes), but who cares ;) */
338 if (copy_from_user(kbs, user_kdgkb, sizeof(struct kbsentry))) {
339 ret = -EFAULT;
340 goto reterr;
341 }
342 kbs->kb_string[sizeof(kbs->kb_string)-1] = '\0';
343 i = kbs->kb_func;
344
345 switch (cmd) {
346 case KDGKBSENT:
347 sz = sizeof(kbs->kb_string) - 1; /* sz should have been
348 a struct member */
349 up = user_kdgkb->kb_string;
350 p = func_table[i];
351 if(p)
352 for ( ; *p && sz; p++, sz--)
353 if (put_user(*p, up++)) {
354 ret = -EFAULT;
355 goto reterr;
356 }
357 if (put_user('\0', up)) {
358 ret = -EFAULT;
359 goto reterr;
360 }
361 kfree(kbs);
362 return ((p && *p) ? -EOVERFLOW : 0);
363 case KDSKBSENT:
364 if (!perm) {
365 ret = -EPERM;
366 goto reterr;
367 }
368
369 q = func_table[i];
370 first_free = funcbufptr + (funcbufsize - funcbufleft);
371 for (j = i+1; j < MAX_NR_FUNC && !func_table[j]; j++)
372 ;
373 if (j < MAX_NR_FUNC)
374 fj = func_table[j];
375 else
376 fj = first_free;
377
378 delta = (q ? -strlen(q) : 1) + strlen(kbs->kb_string);
379 if (delta <= funcbufleft) { /* it fits in current buf */
380 if (j < MAX_NR_FUNC) {
381 memmove(fj + delta, fj, first_free - fj);
382 for (k = j; k < MAX_NR_FUNC; k++)
383 if (func_table[k])
384 func_table[k] += delta;
385 }
386 if (!q)
387 func_table[i] = fj;
388 funcbufleft -= delta;
389 } else { /* allocate a larger buffer */
390 sz = 256;
391 while (sz < funcbufsize - funcbufleft + delta)
392 sz <<= 1;
393 fnw = kmalloc(sz, GFP_KERNEL);
394 if(!fnw) {
395 ret = -ENOMEM;
396 goto reterr;
397 }
398
399 if (!q)
400 func_table[i] = fj;
401 if (fj > funcbufptr)
402 memmove(fnw, funcbufptr, fj - funcbufptr);
403 for (k = 0; k < j; k++)
404 if (func_table[k])
405 func_table[k] = fnw + (func_table[k] - funcbufptr);
406
407 if (first_free > fj) {
408 memmove(fnw + (fj - funcbufptr) + delta, fj, first_free - fj);
409 for (k = j; k < MAX_NR_FUNC; k++)
410 if (func_table[k])
411 func_table[k] = fnw + (func_table[k] - funcbufptr) + delta;
412 }
413 if (funcbufptr != func_buf)
414 kfree(funcbufptr);
415 funcbufptr = fnw;
416 funcbufleft = funcbufleft - delta + sz - funcbufsize;
417 funcbufsize = sz;
418 }
419 strcpy(func_table[i], kbs->kb_string);
420 break;
421 }
422 ret = 0;
423 reterr:
424 kfree(kbs);
425 return ret;
426 }
427
428 static inline int
429 do_fontx_ioctl(int cmd, struct consolefontdesc __user *user_cfd, int perm, struct console_font_op *op)
430 {
431 struct consolefontdesc cfdarg;
432 int i;
433
434 if (copy_from_user(&cfdarg, user_cfd, sizeof(struct consolefontdesc)))
435 return -EFAULT;
436
437 switch (cmd) {
438 case PIO_FONTX:
439 if (!perm)
440 return -EPERM;
441 op->op = KD_FONT_OP_SET;
442 op->flags = KD_FONT_FLAG_OLD;
443 op->width = 8;
444 op->height = cfdarg.charheight;
445 op->charcount = cfdarg.charcount;
446 op->data = cfdarg.chardata;
447 return con_font_op(vc_cons[fg_console].d, op);
448 case GIO_FONTX: {
449 op->op = KD_FONT_OP_GET;
450 op->flags = KD_FONT_FLAG_OLD;
451 op->width = 8;
452 op->height = cfdarg.charheight;
453 op->charcount = cfdarg.charcount;
454 op->data = cfdarg.chardata;
455 i = con_font_op(vc_cons[fg_console].d, op);
456 if (i)
457 return i;
458 cfdarg.charheight = op->height;
459 cfdarg.charcount = op->charcount;
460 if (copy_to_user(user_cfd, &cfdarg, sizeof(struct consolefontdesc)))
461 return -EFAULT;
462 return 0;
463 }
464 }
465 return -EINVAL;
466 }
467
468 static inline int
469 do_unimap_ioctl(int cmd, struct unimapdesc __user *user_ud, int perm, struct vc_data *vc)
470 {
471 struct unimapdesc tmp;
472
473 if (copy_from_user(&tmp, user_ud, sizeof tmp))
474 return -EFAULT;
475 if (tmp.entries)
476 if (!access_ok(VERIFY_WRITE, tmp.entries,
477 tmp.entry_ct*sizeof(struct unipair)))
478 return -EFAULT;
479 switch (cmd) {
480 case PIO_UNIMAP:
481 if (!perm)
482 return -EPERM;
483 return con_set_unimap(vc, tmp.entry_ct, tmp.entries);
484 case GIO_UNIMAP:
485 if (!perm && fg_console != vc->vc_num)
486 return -EPERM;
487 return con_get_unimap(vc, tmp.entry_ct, &(user_ud->entry_ct), tmp.entries);
488 }
489 return 0;
490 }
491
492
493
494 /*
495 * We handle the console-specific ioctl's here. We allow the
496 * capability to modify any console, not just the fg_console.
497 */
498 int vt_ioctl(struct tty_struct *tty, struct file * file,
499 unsigned int cmd, unsigned long arg)
500 {
501 struct vc_data *vc = tty->driver_data;
502 struct console_font_op op; /* used in multiple places here */
503 struct kbd_struct * kbd;
504 unsigned int console;
505 unsigned char ucval;
506 unsigned int uival;
507 void __user *up = (void __user *)arg;
508 int i, perm;
509 int ret = 0;
510
511 console = vc->vc_num;
512
513 lock_kernel();
514
515 if (!vc_cons_allocated(console)) { /* impossible? */
516 ret = -ENOIOCTLCMD;
517 goto out;
518 }
519
520
521 /*
522 * To have permissions to do most of the vt ioctls, we either have
523 * to be the owner of the tty, or have CAP_SYS_TTY_CONFIG.
524 */
525 perm = 0;
526 if (current->signal->tty == tty || capable(CAP_SYS_TTY_CONFIG))
527 perm = 1;
528
529 kbd = kbd_table + console;
530 switch (cmd) {
531 case TIOCLINUX:
532 ret = tioclinux(tty, arg);
533 break;
534 case KIOCSOUND:
535 if (!perm)
536 goto eperm;
537 /* FIXME: This is an old broken API but we need to keep it
538 supported and somehow separate the historic advertised
539 tick rate from any real one */
540 if (arg)
541 arg = CLOCK_TICK_RATE / arg;
542 kd_mksound(arg, 0);
543 break;
544
545 case KDMKTONE:
546 if (!perm)
547 goto eperm;
548 {
549 unsigned int ticks, count;
550
551 /*
552 * Generate the tone for the appropriate number of ticks.
553 * If the time is zero, turn off sound ourselves.
554 */
555 ticks = HZ * ((arg >> 16) & 0xffff) / 1000;
556 count = ticks ? (arg & 0xffff) : 0;
557 /* FIXME: This is an old broken API but we need to keep it
558 supported and somehow separate the historic advertised
559 tick rate from any real one */
560 if (count)
561 count = CLOCK_TICK_RATE / count;
562 kd_mksound(count, ticks);
563 break;
564 }
565
566 case KDGKBTYPE:
567 /*
568 * this is naive.
569 */
570 ucval = KB_101;
571 goto setchar;
572
573 /*
574 * These cannot be implemented on any machine that implements
575 * ioperm() in user level (such as Alpha PCs) or not at all.
576 *
577 * XXX: you should never use these, just call ioperm directly..
578 */
579 #ifdef CONFIG_X86
580 case KDADDIO:
581 case KDDELIO:
582 /*
583 * KDADDIO and KDDELIO may be able to add ports beyond what
584 * we reject here, but to be safe...
585 */
586 if (arg < GPFIRST || arg > GPLAST) {
587 ret = -EINVAL;
588 break;
589 }
590 ret = sys_ioperm(arg, 1, (cmd == KDADDIO)) ? -ENXIO : 0;
591 break;
592
593 case KDENABIO:
594 case KDDISABIO:
595 ret = sys_ioperm(GPFIRST, GPNUM,
596 (cmd == KDENABIO)) ? -ENXIO : 0;
597 break;
598 #endif
599
600 /* Linux m68k/i386 interface for setting the keyboard delay/repeat rate */
601
602 case KDKBDREP:
603 {
604 struct kbd_repeat kbrep;
605
606 if (!capable(CAP_SYS_TTY_CONFIG))
607 goto eperm;
608
609 if (copy_from_user(&kbrep, up, sizeof(struct kbd_repeat))) {
610 ret = -EFAULT;
611 break;
612 }
613 ret = kbd_rate(&kbrep);
614 if (ret)
615 break;
616 if (copy_to_user(up, &kbrep, sizeof(struct kbd_repeat)))
617 ret = -EFAULT;
618 break;
619 }
620
621 case KDSETMODE:
622 /*
623 * currently, setting the mode from KD_TEXT to KD_GRAPHICS
624 * doesn't do a whole lot. i'm not sure if it should do any
625 * restoration of modes or what...
626 *
627 * XXX It should at least call into the driver, fbdev's definitely
628 * need to restore their engine state. --BenH
629 */
630 if (!perm)
631 goto eperm;
632 switch (arg) {
633 case KD_GRAPHICS:
634 break;
635 case KD_TEXT0:
636 case KD_TEXT1:
637 arg = KD_TEXT;
638 case KD_TEXT:
639 break;
640 default:
641 ret = -EINVAL;
642 goto out;
643 }
644 if (vc->vc_mode == (unsigned char) arg)
645 break;
646 vc->vc_mode = (unsigned char) arg;
647 if (console != fg_console)
648 break;
649 /*
650 * explicitly blank/unblank the screen if switching modes
651 */
652 acquire_console_sem();
653 if (arg == KD_TEXT)
654 do_unblank_screen(1);
655 else
656 do_blank_screen(1);
657 release_console_sem();
658 break;
659
660 case KDGETMODE:
661 uival = vc->vc_mode;
662 goto setint;
663
664 case KDMAPDISP:
665 case KDUNMAPDISP:
666 /*
667 * these work like a combination of mmap and KDENABIO.
668 * this could be easily finished.
669 */
670 ret = -EINVAL;
671 break;
672
673 case KDSKBMODE:
674 if (!perm)
675 goto eperm;
676 switch(arg) {
677 case K_RAW:
678 kbd->kbdmode = VC_RAW;
679 break;
680 case K_MEDIUMRAW:
681 kbd->kbdmode = VC_MEDIUMRAW;
682 break;
683 case K_XLATE:
684 kbd->kbdmode = VC_XLATE;
685 compute_shiftstate();
686 break;
687 case K_UNICODE:
688 kbd->kbdmode = VC_UNICODE;
689 compute_shiftstate();
690 break;
691 default:
692 ret = -EINVAL;
693 goto out;
694 }
695 tty_ldisc_flush(tty);
696 break;
697
698 case KDGKBMODE:
699 uival = ((kbd->kbdmode == VC_RAW) ? K_RAW :
700 (kbd->kbdmode == VC_MEDIUMRAW) ? K_MEDIUMRAW :
701 (kbd->kbdmode == VC_UNICODE) ? K_UNICODE :
702 K_XLATE);
703 goto setint;
704
705 /* this could be folded into KDSKBMODE, but for compatibility
706 reasons it is not so easy to fold KDGKBMETA into KDGKBMODE */
707 case KDSKBMETA:
708 switch(arg) {
709 case K_METABIT:
710 clr_vc_kbd_mode(kbd, VC_META);
711 break;
712 case K_ESCPREFIX:
713 set_vc_kbd_mode(kbd, VC_META);
714 break;
715 default:
716 ret = -EINVAL;
717 }
718 break;
719
720 case KDGKBMETA:
721 uival = (vc_kbd_mode(kbd, VC_META) ? K_ESCPREFIX : K_METABIT);
722 setint:
723 ret = put_user(uival, (int __user *)arg);
724 break;
725
726 case KDGETKEYCODE:
727 case KDSETKEYCODE:
728 if(!capable(CAP_SYS_TTY_CONFIG))
729 perm = 0;
730 ret = do_kbkeycode_ioctl(cmd, up, perm);
731 break;
732
733 case KDGKBENT:
734 case KDSKBENT:
735 ret = do_kdsk_ioctl(cmd, up, perm, kbd);
736 break;
737
738 case KDGKBSENT:
739 case KDSKBSENT:
740 ret = do_kdgkb_ioctl(cmd, up, perm);
741 break;
742
743 case KDGKBDIACR:
744 {
745 struct kbdiacrs __user *a = up;
746 struct kbdiacr diacr;
747 int i;
748
749 if (put_user(accent_table_size, &a->kb_cnt)) {
750 ret = -EFAULT;
751 break;
752 }
753 for (i = 0; i < accent_table_size; i++) {
754 diacr.diacr = conv_uni_to_8bit(accent_table[i].diacr);
755 diacr.base = conv_uni_to_8bit(accent_table[i].base);
756 diacr.result = conv_uni_to_8bit(accent_table[i].result);
757 if (copy_to_user(a->kbdiacr + i, &diacr, sizeof(struct kbdiacr))) {
758 ret = -EFAULT;
759 break;
760 }
761 }
762 break;
763 }
764 case KDGKBDIACRUC:
765 {
766 struct kbdiacrsuc __user *a = up;
767
768 if (put_user(accent_table_size, &a->kb_cnt))
769 ret = -EFAULT;
770 else if (copy_to_user(a->kbdiacruc, accent_table,
771 accent_table_size*sizeof(struct kbdiacruc)))
772 ret = -EFAULT;
773 break;
774 }
775
776 case KDSKBDIACR:
777 {
778 struct kbdiacrs __user *a = up;
779 struct kbdiacr diacr;
780 unsigned int ct;
781 int i;
782
783 if (!perm)
784 goto eperm;
785 if (get_user(ct,&a->kb_cnt)) {
786 ret = -EFAULT;
787 break;
788 }
789 if (ct >= MAX_DIACR) {
790 ret = -EINVAL;
791 break;
792 }
793 accent_table_size = ct;
794 for (i = 0; i < ct; i++) {
795 if (copy_from_user(&diacr, a->kbdiacr + i, sizeof(struct kbdiacr))) {
796 ret = -EFAULT;
797 break;
798 }
799 accent_table[i].diacr = conv_8bit_to_uni(diacr.diacr);
800 accent_table[i].base = conv_8bit_to_uni(diacr.base);
801 accent_table[i].result = conv_8bit_to_uni(diacr.result);
802 }
803 break;
804 }
805
806 case KDSKBDIACRUC:
807 {
808 struct kbdiacrsuc __user *a = up;
809 unsigned int ct;
810
811 if (!perm)
812 goto eperm;
813 if (get_user(ct,&a->kb_cnt)) {
814 ret = -EFAULT;
815 break;
816 }
817 if (ct >= MAX_DIACR) {
818 ret = -EINVAL;
819 break;
820 }
821 accent_table_size = ct;
822 if (copy_from_user(accent_table, a->kbdiacruc, ct*sizeof(struct kbdiacruc)))
823 ret = -EFAULT;
824 break;
825 }
826
827 /* the ioctls below read/set the flags usually shown in the leds */
828 /* don't use them - they will go away without warning */
829 case KDGKBLED:
830 ucval = kbd->ledflagstate | (kbd->default_ledflagstate << 4);
831 goto setchar;
832
833 case KDSKBLED:
834 if (!perm)
835 goto eperm;
836 if (arg & ~0x77) {
837 ret = -EINVAL;
838 break;
839 }
840 kbd->ledflagstate = (arg & 7);
841 kbd->default_ledflagstate = ((arg >> 4) & 7);
842 set_leds();
843 break;
844
845 /* the ioctls below only set the lights, not the functions */
846 /* for those, see KDGKBLED and KDSKBLED above */
847 case KDGETLED:
848 ucval = getledstate();
849 setchar:
850 ret = put_user(ucval, (char __user *)arg);
851 break;
852
853 case KDSETLED:
854 if (!perm)
855 goto eperm;
856 setledstate(kbd, arg);
857 break;
858
859 /*
860 * A process can indicate its willingness to accept signals
861 * generated by pressing an appropriate key combination.
862 * Thus, one can have a daemon that e.g. spawns a new console
863 * upon a keypress and then changes to it.
864 * See also the kbrequest field of inittab(5).
865 */
866 case KDSIGACCEPT:
867 {
868 if (!perm || !capable(CAP_KILL))
869 goto eperm;
870 if (!valid_signal(arg) || arg < 1 || arg == SIGKILL)
871 ret = -EINVAL;
872 else {
873 spin_lock_irq(&vt_spawn_con.lock);
874 put_pid(vt_spawn_con.pid);
875 vt_spawn_con.pid = get_pid(task_pid(current));
876 vt_spawn_con.sig = arg;
877 spin_unlock_irq(&vt_spawn_con.lock);
878 }
879 break;
880 }
881
882 case VT_SETMODE:
883 {
884 struct vt_mode tmp;
885
886 if (!perm)
887 goto eperm;
888 if (copy_from_user(&tmp, up, sizeof(struct vt_mode))) {
889 ret = -EFAULT;
890 goto out;
891 }
892 if (tmp.mode != VT_AUTO && tmp.mode != VT_PROCESS) {
893 ret = -EINVAL;
894 goto out;
895 }
896 acquire_console_sem();
897 vc->vt_mode = tmp;
898 /* the frsig is ignored, so we set it to 0 */
899 vc->vt_mode.frsig = 0;
900 put_pid(vc->vt_pid);
901 vc->vt_pid = get_pid(task_pid(current));
902 /* no switch is required -- saw@shade.msu.ru */
903 vc->vt_newvt = -1;
904 release_console_sem();
905 break;
906 }
907
908 case VT_GETMODE:
909 {
910 struct vt_mode tmp;
911 int rc;
912
913 acquire_console_sem();
914 memcpy(&tmp, &vc->vt_mode, sizeof(struct vt_mode));
915 release_console_sem();
916
917 rc = copy_to_user(up, &tmp, sizeof(struct vt_mode));
918 if (rc)
919 ret = -EFAULT;
920 break;
921 }
922
923 /*
924 * Returns global vt state. Note that VT 0 is always open, since
925 * it's an alias for the current VT, and people can't use it here.
926 * We cannot return state for more than 16 VTs, since v_state is short.
927 */
928 case VT_GETSTATE:
929 {
930 struct vt_stat __user *vtstat = up;
931 unsigned short state, mask;
932
933 if (put_user(fg_console + 1, &vtstat->v_active))
934 ret = -EFAULT;
935 else {
936 state = 1; /* /dev/tty0 is always open */
937 for (i = 0, mask = 2; i < MAX_NR_CONSOLES && mask;
938 ++i, mask <<= 1)
939 if (VT_IS_IN_USE(i))
940 state |= mask;
941 ret = put_user(state, &vtstat->v_state);
942 }
943 break;
944 }
945
946 /*
947 * Returns the first available (non-opened) console.
948 */
949 case VT_OPENQRY:
950 for (i = 0; i < MAX_NR_CONSOLES; ++i)
951 if (! VT_IS_IN_USE(i))
952 break;
953 uival = i < MAX_NR_CONSOLES ? (i+1) : -1;
954 goto setint;
955
956 /*
957 * ioctl(fd, VT_ACTIVATE, num) will cause us to switch to vt # num,
958 * with num >= 1 (switches to vt 0, our console, are not allowed, just
959 * to preserve sanity).
960 */
961 case VT_ACTIVATE:
962 if (!perm)
963 goto eperm;
964 if (arg == 0 || arg > MAX_NR_CONSOLES)
965 ret = -ENXIO;
966 else {
967 arg--;
968 acquire_console_sem();
969 ret = vc_allocate(arg);
970 release_console_sem();
971 if (ret)
972 break;
973 set_console(arg);
974 }
975 break;
976
977 case VT_SETACTIVATE:
978 {
979 struct vt_setactivate vsa;
980
981 if (!perm)
982 goto eperm;
983
984 if (copy_from_user(&vsa, (struct vt_setactivate __user *)arg,
985 sizeof(struct vt_setactivate))) {
986 ret = -EFAULT;
987 goto out;
988 }
989 if (vsa.console == 0 || vsa.console > MAX_NR_CONSOLES)
990 ret = -ENXIO;
991 else {
992 vsa.console--;
993 acquire_console_sem();
994 ret = vc_allocate(vsa.console);
995 if (ret == 0) {
996 struct vc_data *nvc;
997 /* This is safe providing we don't drop the
998 console sem between vc_allocate and
999 finishing referencing nvc */
1000 nvc = vc_cons[vsa.console].d;
1001 nvc->vt_mode = vsa.mode;
1002 nvc->vt_mode.frsig = 0;
1003 put_pid(nvc->vt_pid);
1004 nvc->vt_pid = get_pid(task_pid(current));
1005 }
1006 release_console_sem();
1007 if (ret)
1008 break;
1009 /* Commence switch and lock */
1010 set_console(arg);
1011 }
1012 }
1013
1014 /*
1015 * wait until the specified VT has been activated
1016 */
1017 case VT_WAITACTIVE:
1018 if (!perm)
1019 goto eperm;
1020 if (arg == 0 || arg > MAX_NR_CONSOLES)
1021 ret = -ENXIO;
1022 else
1023 ret = vt_waitactive(arg);
1024 break;
1025
1026 /*
1027 * If a vt is under process control, the kernel will not switch to it
1028 * immediately, but postpone the operation until the process calls this
1029 * ioctl, allowing the switch to complete.
1030 *
1031 * According to the X sources this is the behavior:
1032 * 0: pending switch-from not OK
1033 * 1: pending switch-from OK
1034 * 2: completed switch-to OK
1035 */
1036 case VT_RELDISP:
1037 if (!perm)
1038 goto eperm;
1039
1040 if (vc->vt_mode.mode != VT_PROCESS) {
1041 ret = -EINVAL;
1042 break;
1043 }
1044 /*
1045 * Switching-from response
1046 */
1047 acquire_console_sem();
1048 if (vc->vt_newvt >= 0) {
1049 if (arg == 0)
1050 /*
1051 * Switch disallowed, so forget we were trying
1052 * to do it.
1053 */
1054 vc->vt_newvt = -1;
1055
1056 else {
1057 /*
1058 * The current vt has been released, so
1059 * complete the switch.
1060 */
1061 int newvt;
1062 newvt = vc->vt_newvt;
1063 vc->vt_newvt = -1;
1064 ret = vc_allocate(newvt);
1065 if (ret) {
1066 release_console_sem();
1067 break;
1068 }
1069 /*
1070 * When we actually do the console switch,
1071 * make sure we are atomic with respect to
1072 * other console switches..
1073 */
1074 complete_change_console(vc_cons[newvt].d);
1075 }
1076 } else {
1077 /*
1078 * Switched-to response
1079 */
1080 /*
1081 * If it's just an ACK, ignore it
1082 */
1083 if (arg != VT_ACKACQ)
1084 ret = -EINVAL;
1085 }
1086 release_console_sem();
1087 break;
1088
1089 /*
1090 * Disallocate memory associated to VT (but leave VT1)
1091 */
1092 case VT_DISALLOCATE:
1093 if (arg > MAX_NR_CONSOLES) {
1094 ret = -ENXIO;
1095 break;
1096 }
1097 if (arg == 0) {
1098 /* deallocate all unused consoles, but leave 0 */
1099 acquire_console_sem();
1100 for (i=1; i<MAX_NR_CONSOLES; i++)
1101 if (! VT_BUSY(i))
1102 vc_deallocate(i);
1103 release_console_sem();
1104 } else {
1105 /* deallocate a single console, if possible */
1106 arg--;
1107 if (VT_BUSY(arg))
1108 ret = -EBUSY;
1109 else if (arg) { /* leave 0 */
1110 acquire_console_sem();
1111 vc_deallocate(arg);
1112 release_console_sem();
1113 }
1114 }
1115 break;
1116
1117 case VT_RESIZE:
1118 {
1119 struct vt_sizes __user *vtsizes = up;
1120 struct vc_data *vc;
1121
1122 ushort ll,cc;
1123 if (!perm)
1124 goto eperm;
1125 if (get_user(ll, &vtsizes->v_rows) ||
1126 get_user(cc, &vtsizes->v_cols))
1127 ret = -EFAULT;
1128 else {
1129 acquire_console_sem();
1130 for (i = 0; i < MAX_NR_CONSOLES; i++) {
1131 vc = vc_cons[i].d;
1132
1133 if (vc) {
1134 vc->vc_resize_user = 1;
1135 vc_resize(vc_cons[i].d, cc, ll);
1136 }
1137 }
1138 release_console_sem();
1139 }
1140 break;
1141 }
1142
1143 case VT_RESIZEX:
1144 {
1145 struct vt_consize __user *vtconsize = up;
1146 ushort ll,cc,vlin,clin,vcol,ccol;
1147 if (!perm)
1148 goto eperm;
1149 if (!access_ok(VERIFY_READ, vtconsize,
1150 sizeof(struct vt_consize))) {
1151 ret = -EFAULT;
1152 break;
1153 }
1154 /* FIXME: Should check the copies properly */
1155 __get_user(ll, &vtconsize->v_rows);
1156 __get_user(cc, &vtconsize->v_cols);
1157 __get_user(vlin, &vtconsize->v_vlin);
1158 __get_user(clin, &vtconsize->v_clin);
1159 __get_user(vcol, &vtconsize->v_vcol);
1160 __get_user(ccol, &vtconsize->v_ccol);
1161 vlin = vlin ? vlin : vc->vc_scan_lines;
1162 if (clin) {
1163 if (ll) {
1164 if (ll != vlin/clin) {
1165 /* Parameters don't add up */
1166 ret = -EINVAL;
1167 break;
1168 }
1169 } else
1170 ll = vlin/clin;
1171 }
1172 if (vcol && ccol) {
1173 if (cc) {
1174 if (cc != vcol/ccol) {
1175 ret = -EINVAL;
1176 break;
1177 }
1178 } else
1179 cc = vcol/ccol;
1180 }
1181
1182 if (clin > 32) {
1183 ret = -EINVAL;
1184 break;
1185 }
1186
1187 for (i = 0; i < MAX_NR_CONSOLES; i++) {
1188 if (!vc_cons[i].d)
1189 continue;
1190 acquire_console_sem();
1191 if (vlin)
1192 vc_cons[i].d->vc_scan_lines = vlin;
1193 if (clin)
1194 vc_cons[i].d->vc_font.height = clin;
1195 vc_cons[i].d->vc_resize_user = 1;
1196 vc_resize(vc_cons[i].d, cc, ll);
1197 release_console_sem();
1198 }
1199 break;
1200 }
1201
1202 case PIO_FONT: {
1203 if (!perm)
1204 goto eperm;
1205 op.op = KD_FONT_OP_SET;
1206 op.flags = KD_FONT_FLAG_OLD | KD_FONT_FLAG_DONT_RECALC; /* Compatibility */
1207 op.width = 8;
1208 op.height = 0;
1209 op.charcount = 256;
1210 op.data = up;
1211 ret = con_font_op(vc_cons[fg_console].d, &op);
1212 break;
1213 }
1214
1215 case GIO_FONT: {
1216 op.op = KD_FONT_OP_GET;
1217 op.flags = KD_FONT_FLAG_OLD;
1218 op.width = 8;
1219 op.height = 32;
1220 op.charcount = 256;
1221 op.data = up;
1222 ret = con_font_op(vc_cons[fg_console].d, &op);
1223 break;
1224 }
1225
1226 case PIO_CMAP:
1227 if (!perm)
1228 ret = -EPERM;
1229 else
1230 ret = con_set_cmap(up);
1231 break;
1232
1233 case GIO_CMAP:
1234 ret = con_get_cmap(up);
1235 break;
1236
1237 case PIO_FONTX:
1238 case GIO_FONTX:
1239 ret = do_fontx_ioctl(cmd, up, perm, &op);
1240 break;
1241
1242 case PIO_FONTRESET:
1243 {
1244 if (!perm)
1245 goto eperm;
1246
1247 #ifdef BROKEN_GRAPHICS_PROGRAMS
1248 /* With BROKEN_GRAPHICS_PROGRAMS defined, the default
1249 font is not saved. */
1250 ret = -ENOSYS;
1251 break;
1252 #else
1253 {
1254 op.op = KD_FONT_OP_SET_DEFAULT;
1255 op.data = NULL;
1256 ret = con_font_op(vc_cons[fg_console].d, &op);
1257 if (ret)
1258 break;
1259 con_set_default_unimap(vc_cons[fg_console].d);
1260 break;
1261 }
1262 #endif
1263 }
1264
1265 case KDFONTOP: {
1266 if (copy_from_user(&op, up, sizeof(op))) {
1267 ret = -EFAULT;
1268 break;
1269 }
1270 if (!perm && op.op != KD_FONT_OP_GET)
1271 goto eperm;
1272 ret = con_font_op(vc, &op);
1273 if (ret)
1274 break;
1275 if (copy_to_user(up, &op, sizeof(op)))
1276 ret = -EFAULT;
1277 break;
1278 }
1279
1280 case PIO_SCRNMAP:
1281 if (!perm)
1282 ret = -EPERM;
1283 else
1284 ret = con_set_trans_old(up);
1285 break;
1286
1287 case GIO_SCRNMAP:
1288 ret = con_get_trans_old(up);
1289 break;
1290
1291 case PIO_UNISCRNMAP:
1292 if (!perm)
1293 ret = -EPERM;
1294 else
1295 ret = con_set_trans_new(up);
1296 break;
1297
1298 case GIO_UNISCRNMAP:
1299 ret = con_get_trans_new(up);
1300 break;
1301
1302 case PIO_UNIMAPCLR:
1303 { struct unimapinit ui;
1304 if (!perm)
1305 goto eperm;
1306 ret = copy_from_user(&ui, up, sizeof(struct unimapinit));
1307 if (!ret)
1308 con_clear_unimap(vc, &ui);
1309 break;
1310 }
1311
1312 case PIO_UNIMAP:
1313 case GIO_UNIMAP:
1314 ret = do_unimap_ioctl(cmd, up, perm, vc);
1315 break;
1316
1317 case VT_LOCKSWITCH:
1318 if (!capable(CAP_SYS_TTY_CONFIG))
1319 goto eperm;
1320 vt_dont_switch = 1;
1321 break;
1322 case VT_UNLOCKSWITCH:
1323 if (!capable(CAP_SYS_TTY_CONFIG))
1324 goto eperm;
1325 vt_dont_switch = 0;
1326 break;
1327 case VT_GETHIFONTMASK:
1328 ret = put_user(vc->vc_hi_font_mask,
1329 (unsigned short __user *)arg);
1330 break;
1331 case VT_WAITEVENT:
1332 ret = vt_event_wait_ioctl((struct vt_event __user *)arg);
1333 break;
1334 default:
1335 ret = -ENOIOCTLCMD;
1336 }
1337 out:
1338 unlock_kernel();
1339 return ret;
1340 eperm:
1341 ret = -EPERM;
1342 goto out;
1343 }
1344
1345 void reset_vc(struct vc_data *vc)
1346 {
1347 vc->vc_mode = KD_TEXT;
1348 kbd_table[vc->vc_num].kbdmode = default_utf8 ? VC_UNICODE : VC_XLATE;
1349 vc->vt_mode.mode = VT_AUTO;
1350 vc->vt_mode.waitv = 0;
1351 vc->vt_mode.relsig = 0;
1352 vc->vt_mode.acqsig = 0;
1353 vc->vt_mode.frsig = 0;
1354 put_pid(vc->vt_pid);
1355 vc->vt_pid = NULL;
1356 vc->vt_newvt = -1;
1357 if (!in_interrupt()) /* Via keyboard.c:SAK() - akpm */
1358 reset_palette(vc);
1359 }
1360
1361 void vc_SAK(struct work_struct *work)
1362 {
1363 struct vc *vc_con =
1364 container_of(work, struct vc, SAK_work);
1365 struct vc_data *vc;
1366 struct tty_struct *tty;
1367
1368 acquire_console_sem();
1369 vc = vc_con->d;
1370 if (vc) {
1371 tty = vc->vc_tty;
1372 /*
1373 * SAK should also work in all raw modes and reset
1374 * them properly.
1375 */
1376 if (tty)
1377 __do_SAK(tty);
1378 reset_vc(vc);
1379 }
1380 release_console_sem();
1381 }
1382
1383 #ifdef CONFIG_COMPAT
1384
1385 struct compat_consolefontdesc {
1386 unsigned short charcount; /* characters in font (256 or 512) */
1387 unsigned short charheight; /* scan lines per character (1-32) */
1388 compat_caddr_t chardata; /* font data in expanded form */
1389 };
1390
1391 static inline int
1392 compat_fontx_ioctl(int cmd, struct compat_consolefontdesc __user *user_cfd,
1393 int perm, struct console_font_op *op)
1394 {
1395 struct compat_consolefontdesc cfdarg;
1396 int i;
1397
1398 if (copy_from_user(&cfdarg, user_cfd, sizeof(struct compat_consolefontdesc)))
1399 return -EFAULT;
1400
1401 switch (cmd) {
1402 case PIO_FONTX:
1403 if (!perm)
1404 return -EPERM;
1405 op->op = KD_FONT_OP_SET;
1406 op->flags = KD_FONT_FLAG_OLD;
1407 op->width = 8;
1408 op->height = cfdarg.charheight;
1409 op->charcount = cfdarg.charcount;
1410 op->data = compat_ptr(cfdarg.chardata);
1411 return con_font_op(vc_cons[fg_console].d, op);
1412 case GIO_FONTX:
1413 op->op = KD_FONT_OP_GET;
1414 op->flags = KD_FONT_FLAG_OLD;
1415 op->width = 8;
1416 op->height = cfdarg.charheight;
1417 op->charcount = cfdarg.charcount;
1418 op->data = compat_ptr(cfdarg.chardata);
1419 i = con_font_op(vc_cons[fg_console].d, op);
1420 if (i)
1421 return i;
1422 cfdarg.charheight = op->height;
1423 cfdarg.charcount = op->charcount;
1424 if (copy_to_user(user_cfd, &cfdarg, sizeof(struct compat_consolefontdesc)))
1425 return -EFAULT;
1426 return 0;
1427 }
1428 return -EINVAL;
1429 }
1430
1431 struct compat_console_font_op {
1432 compat_uint_t op; /* operation code KD_FONT_OP_* */
1433 compat_uint_t flags; /* KD_FONT_FLAG_* */
1434 compat_uint_t width, height; /* font size */
1435 compat_uint_t charcount;
1436 compat_caddr_t data; /* font data with height fixed to 32 */
1437 };
1438
1439 static inline int
1440 compat_kdfontop_ioctl(struct compat_console_font_op __user *fontop,
1441 int perm, struct console_font_op *op, struct vc_data *vc)
1442 {
1443 int i;
1444
1445 if (copy_from_user(op, fontop, sizeof(struct compat_console_font_op)))
1446 return -EFAULT;
1447 if (!perm && op->op != KD_FONT_OP_GET)
1448 return -EPERM;
1449 op->data = compat_ptr(((struct compat_console_font_op *)op)->data);
1450 op->flags |= KD_FONT_FLAG_OLD;
1451 i = con_font_op(vc, op);
1452 if (i)
1453 return i;
1454 ((struct compat_console_font_op *)op)->data = (unsigned long)op->data;
1455 if (copy_to_user(fontop, op, sizeof(struct compat_console_font_op)))
1456 return -EFAULT;
1457 return 0;
1458 }
1459
1460 struct compat_unimapdesc {
1461 unsigned short entry_ct;
1462 compat_caddr_t entries;
1463 };
1464
1465 static inline int
1466 compat_unimap_ioctl(unsigned int cmd, struct compat_unimapdesc __user *user_ud,
1467 int perm, struct vc_data *vc)
1468 {
1469 struct compat_unimapdesc tmp;
1470 struct unipair __user *tmp_entries;
1471
1472 if (copy_from_user(&tmp, user_ud, sizeof tmp))
1473 return -EFAULT;
1474 tmp_entries = compat_ptr(tmp.entries);
1475 if (tmp_entries)
1476 if (!access_ok(VERIFY_WRITE, tmp_entries,
1477 tmp.entry_ct*sizeof(struct unipair)))
1478 return -EFAULT;
1479 switch (cmd) {
1480 case PIO_UNIMAP:
1481 if (!perm)
1482 return -EPERM;
1483 return con_set_unimap(vc, tmp.entry_ct, tmp_entries);
1484 case GIO_UNIMAP:
1485 if (!perm && fg_console != vc->vc_num)
1486 return -EPERM;
1487 return con_get_unimap(vc, tmp.entry_ct, &(user_ud->entry_ct), tmp_entries);
1488 }
1489 return 0;
1490 }
1491
1492 long vt_compat_ioctl(struct tty_struct *tty, struct file * file,
1493 unsigned int cmd, unsigned long arg)
1494 {
1495 struct vc_data *vc = tty->driver_data;
1496 struct console_font_op op; /* used in multiple places here */
1497 struct kbd_struct *kbd;
1498 unsigned int console;
1499 void __user *up = (void __user *)arg;
1500 int perm;
1501 int ret = 0;
1502
1503 console = vc->vc_num;
1504
1505 lock_kernel();
1506
1507 if (!vc_cons_allocated(console)) { /* impossible? */
1508 ret = -ENOIOCTLCMD;
1509 goto out;
1510 }
1511
1512 /*
1513 * To have permissions to do most of the vt ioctls, we either have
1514 * to be the owner of the tty, or have CAP_SYS_TTY_CONFIG.
1515 */
1516 perm = 0;
1517 if (current->signal->tty == tty || capable(CAP_SYS_TTY_CONFIG))
1518 perm = 1;
1519
1520 kbd = kbd_table + console;
1521 switch (cmd) {
1522 /*
1523 * these need special handlers for incompatible data structures
1524 */
1525 case PIO_FONTX:
1526 case GIO_FONTX:
1527 ret = compat_fontx_ioctl(cmd, up, perm, &op);
1528 break;
1529
1530 case KDFONTOP:
1531 ret = compat_kdfontop_ioctl(up, perm, &op, vc);
1532 break;
1533
1534 case PIO_UNIMAP:
1535 case GIO_UNIMAP:
1536 ret = compat_unimap_ioctl(cmd, up, perm, vc);
1537 break;
1538
1539 /*
1540 * all these treat 'arg' as an integer
1541 */
1542 case KIOCSOUND:
1543 case KDMKTONE:
1544 #ifdef CONFIG_X86
1545 case KDADDIO:
1546 case KDDELIO:
1547 #endif
1548 case KDSETMODE:
1549 case KDMAPDISP:
1550 case KDUNMAPDISP:
1551 case KDSKBMODE:
1552 case KDSKBMETA:
1553 case KDSKBLED:
1554 case KDSETLED:
1555 case KDSIGACCEPT:
1556 case VT_ACTIVATE:
1557 case VT_WAITACTIVE:
1558 case VT_RELDISP:
1559 case VT_DISALLOCATE:
1560 case VT_RESIZE:
1561 case VT_RESIZEX:
1562 goto fallback;
1563
1564 /*
1565 * the rest has a compatible data structure behind arg,
1566 * but we have to convert it to a proper 64 bit pointer.
1567 */
1568 default:
1569 arg = (unsigned long)compat_ptr(arg);
1570 goto fallback;
1571 }
1572 out:
1573 unlock_kernel();
1574 return ret;
1575
1576 fallback:
1577 unlock_kernel();
1578 return vt_ioctl(tty, file, cmd, arg);
1579 }
1580
1581
1582 #endif /* CONFIG_COMPAT */
1583
1584
1585 /*
1586 * Performs the back end of a vt switch. Called under the console
1587 * semaphore.
1588 */
1589 static void complete_change_console(struct vc_data *vc)
1590 {
1591 unsigned char old_vc_mode;
1592 int old = fg_console;
1593
1594 last_console = fg_console;
1595
1596 /*
1597 * If we're switching, we could be going from KD_GRAPHICS to
1598 * KD_TEXT mode or vice versa, which means we need to blank or
1599 * unblank the screen later.
1600 */
1601 old_vc_mode = vc_cons[fg_console].d->vc_mode;
1602 switch_screen(vc);
1603
1604 /*
1605 * This can't appear below a successful kill_pid(). If it did,
1606 * then the *blank_screen operation could occur while X, having
1607 * received acqsig, is waking up on another processor. This
1608 * condition can lead to overlapping accesses to the VGA range
1609 * and the framebuffer (causing system lockups).
1610 *
1611 * To account for this we duplicate this code below only if the
1612 * controlling process is gone and we've called reset_vc.
1613 */
1614 if (old_vc_mode != vc->vc_mode) {
1615 if (vc->vc_mode == KD_TEXT)
1616 do_unblank_screen(1);
1617 else
1618 do_blank_screen(1);
1619 }
1620
1621 /*
1622 * If this new console is under process control, send it a signal
1623 * telling it that it has acquired. Also check if it has died and
1624 * clean up (similar to logic employed in change_console())
1625 */
1626 if (vc->vt_mode.mode == VT_PROCESS) {
1627 /*
1628 * Send the signal as privileged - kill_pid() will
1629 * tell us if the process has gone or something else
1630 * is awry
1631 */
1632 if (kill_pid(vc->vt_pid, vc->vt_mode.acqsig, 1) != 0) {
1633 /*
1634 * The controlling process has died, so we revert back to
1635 * normal operation. In this case, we'll also change back
1636 * to KD_TEXT mode. I'm not sure if this is strictly correct
1637 * but it saves the agony when the X server dies and the screen
1638 * remains blanked due to KD_GRAPHICS! It would be nice to do
1639 * this outside of VT_PROCESS but there is no single process
1640 * to account for and tracking tty count may be undesirable.
1641 */
1642 reset_vc(vc);
1643
1644 if (old_vc_mode != vc->vc_mode) {
1645 if (vc->vc_mode == KD_TEXT)
1646 do_unblank_screen(1);
1647 else
1648 do_blank_screen(1);
1649 }
1650 }
1651 }
1652
1653 /*
1654 * Wake anyone waiting for their VT to activate
1655 */
1656 vt_event_post(VT_EVENT_SWITCH, old, vc->vc_num);
1657 return;
1658 }
1659
1660 /*
1661 * Performs the front-end of a vt switch
1662 */
1663 void change_console(struct vc_data *new_vc)
1664 {
1665 struct vc_data *vc;
1666
1667 if (!new_vc || new_vc->vc_num == fg_console || vt_dont_switch)
1668 return;
1669
1670 /*
1671 * If this vt is in process mode, then we need to handshake with
1672 * that process before switching. Essentially, we store where that
1673 * vt wants to switch to and wait for it to tell us when it's done
1674 * (via VT_RELDISP ioctl).
1675 *
1676 * We also check to see if the controlling process still exists.
1677 * If it doesn't, we reset this vt to auto mode and continue.
1678 * This is a cheap way to track process control. The worst thing
1679 * that can happen is: we send a signal to a process, it dies, and
1680 * the switch gets "lost" waiting for a response; hopefully, the
1681 * user will try again, we'll detect the process is gone (unless
1682 * the user waits just the right amount of time :-) and revert the
1683 * vt to auto control.
1684 */
1685 vc = vc_cons[fg_console].d;
1686 if (vc->vt_mode.mode == VT_PROCESS) {
1687 /*
1688 * Send the signal as privileged - kill_pid() will
1689 * tell us if the process has gone or something else
1690 * is awry.
1691 *
1692 * We need to set vt_newvt *before* sending the signal or we
1693 * have a race.
1694 */
1695 vc->vt_newvt = new_vc->vc_num;
1696 if (kill_pid(vc->vt_pid, vc->vt_mode.relsig, 1) == 0) {
1697 /*
1698 * It worked. Mark the vt to switch to and
1699 * return. The process needs to send us a
1700 * VT_RELDISP ioctl to complete the switch.
1701 */
1702 return;
1703 }
1704
1705 /*
1706 * The controlling process has died, so we revert back to
1707 * normal operation. In this case, we'll also change back
1708 * to KD_TEXT mode. I'm not sure if this is strictly correct
1709 * but it saves the agony when the X server dies and the screen
1710 * remains blanked due to KD_GRAPHICS! It would be nice to do
1711 * this outside of VT_PROCESS but there is no single process
1712 * to account for and tracking tty count may be undesirable.
1713 */
1714 reset_vc(vc);
1715
1716 /*
1717 * Fall through to normal (VT_AUTO) handling of the switch...
1718 */
1719 }
1720
1721 /*
1722 * Ignore all switches in KD_GRAPHICS+VT_AUTO mode
1723 */
1724 if (vc->vc_mode == KD_GRAPHICS)
1725 return;
1726
1727 complete_change_console(new_vc);
1728 }
1729
1730 /* Perform a kernel triggered VT switch for suspend/resume */
1731
1732 static int disable_vt_switch;
1733
1734 int vt_move_to_console(unsigned int vt, int alloc)
1735 {
1736 int prev;
1737
1738 acquire_console_sem();
1739 /* Graphics mode - up to X */
1740 if (disable_vt_switch) {
1741 release_console_sem();
1742 return 0;
1743 }
1744 prev = fg_console;
1745
1746 if (alloc && vc_allocate(vt)) {
1747 /* we can't have a free VC for now. Too bad,
1748 * we don't want to mess the screen for now. */
1749 release_console_sem();
1750 return -ENOSPC;
1751 }
1752
1753 if (set_console(vt)) {
1754 /*
1755 * We're unable to switch to the SUSPEND_CONSOLE.
1756 * Let the calling function know so it can decide
1757 * what to do.
1758 */
1759 release_console_sem();
1760 return -EIO;
1761 }
1762 release_console_sem();
1763 if (vt_waitactive(vt + 1)) {
1764 pr_debug("Suspend: Can't switch VCs.");
1765 return -EINTR;
1766 }
1767 return prev;
1768 }
1769
1770 /*
1771 * Normally during a suspend, we allocate a new console and switch to it.
1772 * When we resume, we switch back to the original console. This switch
1773 * can be slow, so on systems where the framebuffer can handle restoration
1774 * of video registers anyways, there's little point in doing the console
1775 * switch. This function allows you to disable it by passing it '0'.
1776 */
1777 void pm_set_vt_switch(int do_switch)
1778 {
1779 acquire_console_sem();
1780 disable_vt_switch = !do_switch;
1781 release_console_sem();
1782 }
1783 EXPORT_SYMBOL(pm_set_vt_switch);
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree