blob: fc2c06c66e89d5e7536c5bb5387bc0fd9a837086 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
Linus Torvalds1da177e2005-04-16 15:20:36 -07002 * Copyright (C) 1992 obz under the linux copyright
3 *
4 * Dynamic diacritical handling - aeb@cwi.nl - Dec 1993
5 * Dynamic keymap and string allocation - aeb@cwi.nl - May 1994
6 * Restrict VT switching via ioctl() - grif@cs.ucr.edu - Dec 1995
7 * Some code moved for less code duplication - Andi Kleen - Mar 1997
8 * Check put/get_user, cleanups - acme@conectiva.com.br - Jun 2001
9 */
10
Linus Torvalds1da177e2005-04-16 15:20:36 -070011#include <linux/types.h>
12#include <linux/errno.h>
13#include <linux/sched.h>
14#include <linux/tty.h>
15#include <linux/timer.h>
16#include <linux/kernel.h>
Arnd Bergmanne9216652009-08-06 15:09:28 +020017#include <linux/compat.h>
Alan Cox8d233552009-09-19 13:13:25 -070018#include <linux/module.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070019#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>
Samuel Thibault04c71972007-10-16 23:27:04 -070026#include <linux/consolemap.h>
Jesper Juhl7ed20e12005-05-01 08:59:14 -070027#include <linux/signal.h>
Josh Tripletta5e04b72012-11-18 21:27:41 -080028#include <linux/suspend.h>
Emmanuel Colbusbcc8ca02005-06-28 20:44:49 -070029#include <linux/timex.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070030
31#include <asm/io.h>
32#include <asm/uaccess.h>
33
34#include <linux/kbd_kern.h>
35#include <linux/vt_kern.h>
36#include <linux/kbd_diacr.h>
37#include <linux/selection.h>
38
Andrew Johnsonb257bc02007-03-16 13:38:24 -080039char vt_dont_switch;
Linus Torvalds1da177e2005-04-16 15:20:36 -070040extern struct tty_driver *console_driver;
41
42#define VT_IS_IN_USE(i) (console_driver->ttys[i] && console_driver->ttys[i]->count)
43#define VT_BUSY(i) (VT_IS_IN_USE(i) || i == fg_console || vc_cons[i].d == sel_cons)
44
45/*
46 * Console (vt and kd) routines, as defined by USL SVR4 manual, and by
47 * experimentation and study of X386 SYSV handling.
48 *
49 * One point of difference: SYSV vt's are /dev/vtX, which X >= 0, and
50 * /dev/console is a separate ttyp. Under Linux, /dev/tty0 is /dev/console,
51 * and the vc start at /dev/ttyX, X >= 1. We maintain that here, so we will
52 * always treat our set of vt as numbered 1..MAX_NR_CONSOLES (corresponding to
53 * ttys 0..MAX_NR_CONSOLES-1). Explicitly naming VT 0 is illegal, but using
54 * /dev/tty0 (fg_console) as a target is legal, since an implicit aliasing
55 * to the current console is done by the main ioctl code.
56 */
57
58#ifdef CONFIG_X86
59#include <linux/syscalls.h>
60#endif
61
62static void complete_change_console(struct vc_data *vc);
63
64/*
Alan Cox8b92e872009-09-19 13:13:24 -070065 * User space VT_EVENT handlers
66 */
67
68struct vt_event_wait {
69 struct list_head list;
70 struct vt_event event;
71 int done;
72};
73
74static LIST_HEAD(vt_events);
75static DEFINE_SPINLOCK(vt_event_lock);
76static DECLARE_WAIT_QUEUE_HEAD(vt_event_waitqueue);
77
78/**
79 * vt_event_post
80 * @event: the event that occurred
81 * @old: old console
82 * @new: new console
83 *
84 * Post an VT event to interested VT handlers
85 */
86
87void vt_event_post(unsigned int event, unsigned int old, unsigned int new)
88{
89 struct list_head *pos, *head;
90 unsigned long flags;
91 int wake = 0;
92
93 spin_lock_irqsave(&vt_event_lock, flags);
94 head = &vt_events;
95
96 list_for_each(pos, head) {
97 struct vt_event_wait *ve = list_entry(pos,
98 struct vt_event_wait, list);
99 if (!(ve->event.event & event))
100 continue;
101 ve->event.event = event;
102 /* kernel view is consoles 0..n-1, user space view is
103 console 1..n with 0 meaning current, so we must bias */
Alan Cox308efab2009-11-19 13:30:36 +0000104 ve->event.oldev = old + 1;
105 ve->event.newev = new + 1;
Alan Cox8b92e872009-09-19 13:13:24 -0700106 wake = 1;
107 ve->done = 1;
108 }
109 spin_unlock_irqrestore(&vt_event_lock, flags);
110 if (wake)
111 wake_up_interruptible(&vt_event_waitqueue);
112}
113
Rabin Vincenta7b12922012-05-21 13:38:42 +0530114static void __vt_event_queue(struct vt_event_wait *vw)
115{
116 unsigned long flags;
117 /* Prepare the event */
118 INIT_LIST_HEAD(&vw->list);
119 vw->done = 0;
120 /* Queue our event */
121 spin_lock_irqsave(&vt_event_lock, flags);
122 list_add(&vw->list, &vt_events);
123 spin_unlock_irqrestore(&vt_event_lock, flags);
124}
125
126static void __vt_event_wait(struct vt_event_wait *vw)
127{
128 /* Wait for it to pass */
129 wait_event_interruptible(vt_event_waitqueue, vw->done);
130}
131
132static void __vt_event_dequeue(struct vt_event_wait *vw)
133{
134 unsigned long flags;
135
136 /* Dequeue it */
137 spin_lock_irqsave(&vt_event_lock, flags);
138 list_del(&vw->list);
139 spin_unlock_irqrestore(&vt_event_lock, flags);
140}
141
Alan Cox8b92e872009-09-19 13:13:24 -0700142/**
143 * vt_event_wait - wait for an event
144 * @vw: our event
145 *
146 * Waits for an event to occur which completes our vt_event_wait
147 * structure. On return the structure has wv->done set to 1 for success
148 * or 0 if some event such as a signal ended the wait.
149 */
150
151static void vt_event_wait(struct vt_event_wait *vw)
152{
Rabin Vincenta7b12922012-05-21 13:38:42 +0530153 __vt_event_queue(vw);
154 __vt_event_wait(vw);
155 __vt_event_dequeue(vw);
Alan Cox8b92e872009-09-19 13:13:24 -0700156}
157
158/**
159 * vt_event_wait_ioctl - event ioctl handler
160 * @arg: argument to ioctl
161 *
162 * Implement the VT_WAITEVENT ioctl using the VT event interface
163 */
164
165static int vt_event_wait_ioctl(struct vt_event __user *event)
166{
167 struct vt_event_wait vw;
168
169 if (copy_from_user(&vw.event, event, sizeof(struct vt_event)))
170 return -EFAULT;
171 /* Highest supported event for now */
172 if (vw.event.event & ~VT_MAX_EVENT)
173 return -EINVAL;
174
175 vt_event_wait(&vw);
176 /* If it occurred report it */
177 if (vw.done) {
178 if (copy_to_user(event, &vw.event, sizeof(struct vt_event)))
179 return -EFAULT;
180 return 0;
181 }
182 return -EINTR;
183}
184
185/**
186 * vt_waitactive - active console wait
187 * @event: event code
188 * @n: new console
189 *
190 * Helper for event waits. Used to implement the legacy
191 * event waiting ioctls in terms of events
192 */
193
194int vt_waitactive(int n)
195{
196 struct vt_event_wait vw;
197 do {
Alan Cox8b92e872009-09-19 13:13:24 -0700198 vw.event.event = VT_EVENT_SWITCH;
Rabin Vincenta7b12922012-05-21 13:38:42 +0530199 __vt_event_queue(&vw);
200 if (n == fg_console + 1) {
201 __vt_event_dequeue(&vw);
202 break;
203 }
204 __vt_event_wait(&vw);
205 __vt_event_dequeue(&vw);
Alan Cox8b92e872009-09-19 13:13:24 -0700206 if (vw.done == 0)
207 return -EINTR;
Alan Cox308efab2009-11-19 13:30:36 +0000208 } while (vw.event.newev != n);
Alan Cox8b92e872009-09-19 13:13:24 -0700209 return 0;
210}
211
212/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700213 * these are the valid i/o ports we're allowed to change. they map all the
214 * video ports
215 */
216#define GPFIRST 0x3b4
217#define GPLAST 0x3df
218#define GPNUM (GPLAST - GPFIRST + 1)
219
Linus Torvalds1da177e2005-04-16 15:20:36 -0700220
Linus Torvalds1da177e2005-04-16 15:20:36 -0700221
222static inline int
223do_fontx_ioctl(int cmd, struct consolefontdesc __user *user_cfd, int perm, struct console_font_op *op)
224{
225 struct consolefontdesc cfdarg;
226 int i;
227
228 if (copy_from_user(&cfdarg, user_cfd, sizeof(struct consolefontdesc)))
229 return -EFAULT;
230
231 switch (cmd) {
232 case PIO_FONTX:
233 if (!perm)
234 return -EPERM;
235 op->op = KD_FONT_OP_SET;
236 op->flags = KD_FONT_FLAG_OLD;
237 op->width = 8;
238 op->height = cfdarg.charheight;
239 op->charcount = cfdarg.charcount;
240 op->data = cfdarg.chardata;
241 return con_font_op(vc_cons[fg_console].d, op);
242 case GIO_FONTX: {
243 op->op = KD_FONT_OP_GET;
244 op->flags = KD_FONT_FLAG_OLD;
245 op->width = 8;
246 op->height = cfdarg.charheight;
247 op->charcount = cfdarg.charcount;
248 op->data = cfdarg.chardata;
249 i = con_font_op(vc_cons[fg_console].d, op);
250 if (i)
251 return i;
252 cfdarg.charheight = op->height;
253 cfdarg.charcount = op->charcount;
254 if (copy_to_user(user_cfd, &cfdarg, sizeof(struct consolefontdesc)))
255 return -EFAULT;
256 return 0;
257 }
258 }
259 return -EINVAL;
260}
261
262static inline int
263do_unimap_ioctl(int cmd, struct unimapdesc __user *user_ud, int perm, struct vc_data *vc)
264{
265 struct unimapdesc tmp;
266
267 if (copy_from_user(&tmp, user_ud, sizeof tmp))
268 return -EFAULT;
269 if (tmp.entries)
270 if (!access_ok(VERIFY_WRITE, tmp.entries,
271 tmp.entry_ct*sizeof(struct unipair)))
272 return -EFAULT;
273 switch (cmd) {
274 case PIO_UNIMAP:
275 if (!perm)
276 return -EPERM;
277 return con_set_unimap(vc, tmp.entry_ct, tmp.entries);
278 case GIO_UNIMAP:
279 if (!perm && fg_console != vc->vc_num)
280 return -EPERM;
281 return con_get_unimap(vc, tmp.entry_ct, &(user_ud->entry_ct), tmp.entries);
282 }
283 return 0;
284}
285
Peter Hurley421b40a2013-05-17 12:41:03 -0400286/* deallocate a single console, if possible (leave 0) */
287static int vt_disallocate(unsigned int vc_num)
288{
289 struct vc_data *vc = NULL;
290 int ret = 0;
291
292 if (!vc_num)
293 return 0;
294
295 console_lock();
296 if (VT_BUSY(vc_num))
297 ret = -EBUSY;
298 else
299 vc = vc_deallocate(vc_num);
300 console_unlock();
301
302 if (vc && vc_num >= MIN_NR_CONSOLES) {
303 tty_port_destroy(&vc->port);
304 kfree(vc);
305 }
306
307 return ret;
308}
309
310/* deallocate all unused consoles, but leave 0 */
311static void vt_disallocate_all(void)
312{
313 struct vc_data *vc[MAX_NR_CONSOLES];
314 int i;
315
316 console_lock();
317 for (i = 1; i < MAX_NR_CONSOLES; i++)
318 if (!VT_BUSY(i))
319 vc[i] = vc_deallocate(i);
320 else
321 vc[i] = NULL;
322 console_unlock();
323
324 for (i = 1; i < MAX_NR_CONSOLES; i++) {
325 if (vc[i] && i >= MIN_NR_CONSOLES) {
326 tty_port_destroy(&vc[i]->port);
327 kfree(vc[i]);
328 }
329 }
330}
Alan Cox8b92e872009-09-19 13:13:24 -0700331
332
Linus Torvalds1da177e2005-04-16 15:20:36 -0700333/*
334 * We handle the console-specific ioctl's here. We allow the
335 * capability to modify any console, not just the fg_console.
336 */
Alan Cox6caa76b2011-02-14 16:27:22 +0000337int vt_ioctl(struct tty_struct *tty,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700338 unsigned int cmd, unsigned long arg)
339{
Alan Coxc9f19e92009-01-02 13:47:26 +0000340 struct vc_data *vc = tty->driver_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700341 struct console_font_op op; /* used in multiple places here */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700342 unsigned int console;
343 unsigned char ucval;
Graham Gower1e0ad282010-10-27 15:33:00 -0700344 unsigned int uival;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700345 void __user *up = (void __user *)arg;
346 int i, perm;
Alan Cox9cc3c222008-04-30 00:53:26 -0700347 int ret = 0;
348
Linus Torvalds1da177e2005-04-16 15:20:36 -0700349 console = vc->vc_num;
350
Alan Cox9cc3c222008-04-30 00:53:26 -0700351
352 if (!vc_cons_allocated(console)) { /* impossible? */
353 ret = -ENOIOCTLCMD;
354 goto out;
355 }
356
Linus Torvalds1da177e2005-04-16 15:20:36 -0700357
358 /*
359 * To have permissions to do most of the vt ioctls, we either have
360 * to be the owner of the tty, or have CAP_SYS_TTY_CONFIG.
361 */
362 perm = 0;
363 if (current->signal->tty == tty || capable(CAP_SYS_TTY_CONFIG))
364 perm = 1;
365
Linus Torvalds1da177e2005-04-16 15:20:36 -0700366 switch (cmd) {
Alan Coxe6885102008-10-13 10:36:40 +0100367 case TIOCLINUX:
Jiri Slabya1159022009-06-22 18:42:18 +0100368 ret = tioclinux(tty, arg);
369 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700370 case KIOCSOUND:
371 if (!perm)
Alan Cox4001d7b2012-03-02 14:59:20 +0000372 return -EPERM;
Arnd Bergmann2c4e9672010-08-28 20:35:17 -0700373 /*
374 * The use of PIT_TICK_RATE is historic, it used to be
375 * the platform-dependent CLOCK_TICK_RATE between 2.6.12
376 * and 2.6.36, which was a minor but unfortunate ABI
Alan Cox4001d7b2012-03-02 14:59:20 +0000377 * change. kd_mksound is locked by the input layer.
Arnd Bergmann2c4e9672010-08-28 20:35:17 -0700378 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700379 if (arg)
Arnd Bergmann2c4e9672010-08-28 20:35:17 -0700380 arg = PIT_TICK_RATE / arg;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700381 kd_mksound(arg, 0);
Alan Cox9cc3c222008-04-30 00:53:26 -0700382 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700383
384 case KDMKTONE:
385 if (!perm)
Alan Cox4001d7b2012-03-02 14:59:20 +0000386 return -EPERM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700387 {
388 unsigned int ticks, count;
389
390 /*
391 * Generate the tone for the appropriate number of ticks.
392 * If the time is zero, turn off sound ourselves.
393 */
394 ticks = HZ * ((arg >> 16) & 0xffff) / 1000;
395 count = ticks ? (arg & 0xffff) : 0;
396 if (count)
Arnd Bergmann2c4e9672010-08-28 20:35:17 -0700397 count = PIT_TICK_RATE / count;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700398 kd_mksound(count, ticks);
Alan Cox9cc3c222008-04-30 00:53:26 -0700399 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700400 }
401
402 case KDGKBTYPE:
403 /*
Alan Cox4001d7b2012-03-02 14:59:20 +0000404 * this is naïve.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700405 */
406 ucval = KB_101;
Alan Cox079c9532012-02-28 14:49:23 +0000407 ret = put_user(ucval, (char __user *)arg);
408 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700409
410 /*
411 * These cannot be implemented on any machine that implements
412 * ioperm() in user level (such as Alpha PCs) or not at all.
413 *
414 * XXX: you should never use these, just call ioperm directly..
415 */
416#ifdef CONFIG_X86
417 case KDADDIO:
418 case KDDELIO:
419 /*
420 * KDADDIO and KDDELIO may be able to add ports beyond what
421 * we reject here, but to be safe...
Alan Cox4001d7b2012-03-02 14:59:20 +0000422 *
423 * These are locked internally via sys_ioperm
Linus Torvalds1da177e2005-04-16 15:20:36 -0700424 */
Alan Cox9cc3c222008-04-30 00:53:26 -0700425 if (arg < GPFIRST || arg > GPLAST) {
426 ret = -EINVAL;
427 break;
428 }
429 ret = sys_ioperm(arg, 1, (cmd == KDADDIO)) ? -ENXIO : 0;
430 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700431
432 case KDENABIO:
433 case KDDISABIO:
Alan Cox9cc3c222008-04-30 00:53:26 -0700434 ret = sys_ioperm(GPFIRST, GPNUM,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700435 (cmd == KDENABIO)) ? -ENXIO : 0;
Alan Cox9cc3c222008-04-30 00:53:26 -0700436 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700437#endif
438
439 /* Linux m68k/i386 interface for setting the keyboard delay/repeat rate */
440
441 case KDKBDREP:
442 {
443 struct kbd_repeat kbrep;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700444
445 if (!capable(CAP_SYS_TTY_CONFIG))
Alan Cox4001d7b2012-03-02 14:59:20 +0000446 return -EPERM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700447
Alan Cox9cc3c222008-04-30 00:53:26 -0700448 if (copy_from_user(&kbrep, up, sizeof(struct kbd_repeat))) {
449 ret = -EFAULT;
450 break;
451 }
452 ret = kbd_rate(&kbrep);
453 if (ret)
454 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700455 if (copy_to_user(up, &kbrep, sizeof(struct kbd_repeat)))
Alan Cox9cc3c222008-04-30 00:53:26 -0700456 ret = -EFAULT;
457 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700458 }
459
460 case KDSETMODE:
461 /*
462 * currently, setting the mode from KD_TEXT to KD_GRAPHICS
463 * doesn't do a whole lot. i'm not sure if it should do any
464 * restoration of modes or what...
465 *
466 * XXX It should at least call into the driver, fbdev's definitely
467 * need to restore their engine state. --BenH
468 */
469 if (!perm)
Alan Cox4001d7b2012-03-02 14:59:20 +0000470 return -EPERM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700471 switch (arg) {
472 case KD_GRAPHICS:
473 break;
474 case KD_TEXT0:
475 case KD_TEXT1:
476 arg = KD_TEXT;
477 case KD_TEXT:
478 break;
479 default:
Alan Cox9cc3c222008-04-30 00:53:26 -0700480 ret = -EINVAL;
481 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700482 }
Alan Cox4001d7b2012-03-02 14:59:20 +0000483 /* FIXME: this needs the console lock extending */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700484 if (vc->vc_mode == (unsigned char) arg)
Alan Cox9cc3c222008-04-30 00:53:26 -0700485 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700486 vc->vc_mode = (unsigned char) arg;
487 if (console != fg_console)
Alan Cox9cc3c222008-04-30 00:53:26 -0700488 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700489 /*
490 * explicitly blank/unblank the screen if switching modes
491 */
Torben Hohnac751ef2011-01-25 15:07:35 -0800492 console_lock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700493 if (arg == KD_TEXT)
494 do_unblank_screen(1);
495 else
496 do_blank_screen(1);
Torben Hohnac751ef2011-01-25 15:07:35 -0800497 console_unlock();
Alan Cox9cc3c222008-04-30 00:53:26 -0700498 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700499
500 case KDGETMODE:
Graham Gower1e0ad282010-10-27 15:33:00 -0700501 uival = vc->vc_mode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700502 goto setint;
503
504 case KDMAPDISP:
505 case KDUNMAPDISP:
506 /*
507 * these work like a combination of mmap and KDENABIO.
508 * this could be easily finished.
509 */
Alan Cox9cc3c222008-04-30 00:53:26 -0700510 ret = -EINVAL;
511 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700512
513 case KDSKBMODE:
514 if (!perm)
Alan Cox4001d7b2012-03-02 14:59:20 +0000515 return -EPERM;
Alan Cox079c9532012-02-28 14:49:23 +0000516 ret = vt_do_kdskbmode(console, arg);
517 if (ret == 0)
518 tty_ldisc_flush(tty);
Alan Cox9cc3c222008-04-30 00:53:26 -0700519 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700520
521 case KDGKBMODE:
Alan Cox079c9532012-02-28 14:49:23 +0000522 uival = vt_do_kdgkbmode(console);
523 ret = put_user(uival, (int __user *)arg);
524 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700525
526 /* this could be folded into KDSKBMODE, but for compatibility
527 reasons it is not so easy to fold KDGKBMETA into KDGKBMODE */
528 case KDSKBMETA:
Alan Cox079c9532012-02-28 14:49:23 +0000529 ret = vt_do_kdskbmeta(console, arg);
Alan Cox9cc3c222008-04-30 00:53:26 -0700530 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700531
532 case KDGKBMETA:
Alan Cox079c9532012-02-28 14:49:23 +0000533 /* FIXME: should review whether this is worth locking */
534 uival = vt_do_kdgkbmeta(console);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700535 setint:
Graham Gower1e0ad282010-10-27 15:33:00 -0700536 ret = put_user(uival, (int __user *)arg);
Alan Cox9cc3c222008-04-30 00:53:26 -0700537 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700538
539 case KDGETKEYCODE:
540 case KDSETKEYCODE:
541 if(!capable(CAP_SYS_TTY_CONFIG))
Alan Cox9cc3c222008-04-30 00:53:26 -0700542 perm = 0;
Alan Cox079c9532012-02-28 14:49:23 +0000543 ret = vt_do_kbkeycode_ioctl(cmd, up, perm);
Alan Cox9cc3c222008-04-30 00:53:26 -0700544 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700545
546 case KDGKBENT:
547 case KDSKBENT:
Alan Cox079c9532012-02-28 14:49:23 +0000548 ret = vt_do_kdsk_ioctl(cmd, up, perm, console);
Alan Cox9cc3c222008-04-30 00:53:26 -0700549 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700550
551 case KDGKBSENT:
552 case KDSKBSENT:
Alan Cox079c9532012-02-28 14:49:23 +0000553 ret = vt_do_kdgkb_ioctl(cmd, up, perm);
Alan Cox9cc3c222008-04-30 00:53:26 -0700554 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700555
Alan Cox247ff8e2012-02-24 12:47:11 +0000556 /* Diacritical processing. Handled in keyboard.c as it has
557 to operate on the keyboard locks and structures */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700558 case KDGKBDIACR:
Samuel Thibault04c71972007-10-16 23:27:04 -0700559 case KDGKBDIACRUC:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700560 case KDSKBDIACR:
Samuel Thibault04c71972007-10-16 23:27:04 -0700561 case KDSKBDIACRUC:
Alan Cox247ff8e2012-02-24 12:47:11 +0000562 ret = vt_do_diacrit(cmd, up, perm);
Alan Cox9cc3c222008-04-30 00:53:26 -0700563 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700564
565 /* the ioctls below read/set the flags usually shown in the leds */
566 /* don't use them - they will go away without warning */
567 case KDGKBLED:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700568 case KDSKBLED:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700569 case KDGETLED:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700570 case KDSETLED:
Alan Cox079c9532012-02-28 14:49:23 +0000571 ret = vt_do_kdskled(console, cmd, arg, perm);
Alan Cox9cc3c222008-04-30 00:53:26 -0700572 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700573
574 /*
575 * A process can indicate its willingness to accept signals
576 * generated by pressing an appropriate key combination.
577 * Thus, one can have a daemon that e.g. spawns a new console
578 * upon a keypress and then changes to it.
579 * See also the kbrequest field of inittab(5).
580 */
581 case KDSIGACCEPT:
582 {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700583 if (!perm || !capable(CAP_KILL))
Alan Cox4001d7b2012-03-02 14:59:20 +0000584 return -EPERM;
Jesper Juhl7ed20e12005-05-01 08:59:14 -0700585 if (!valid_signal(arg) || arg < 1 || arg == SIGKILL)
Alan Cox9cc3c222008-04-30 00:53:26 -0700586 ret = -EINVAL;
587 else {
588 spin_lock_irq(&vt_spawn_con.lock);
589 put_pid(vt_spawn_con.pid);
590 vt_spawn_con.pid = get_pid(task_pid(current));
591 vt_spawn_con.sig = arg;
592 spin_unlock_irq(&vt_spawn_con.lock);
593 }
594 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700595 }
596
597 case VT_SETMODE:
598 {
599 struct vt_mode tmp;
600
601 if (!perm)
Alan Cox4001d7b2012-03-02 14:59:20 +0000602 return -EPERM;
Alan Cox9cc3c222008-04-30 00:53:26 -0700603 if (copy_from_user(&tmp, up, sizeof(struct vt_mode))) {
604 ret = -EFAULT;
605 goto out;
606 }
Greg Kroah-Hartman87a6aca2010-03-15 17:14:15 -0700607 if (tmp.mode != VT_AUTO && tmp.mode != VT_PROCESS) {
Alan Cox9cc3c222008-04-30 00:53:26 -0700608 ret = -EINVAL;
609 goto out;
610 }
Torben Hohnac751ef2011-01-25 15:07:35 -0800611 console_lock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700612 vc->vt_mode = tmp;
613 /* the frsig is ignored, so we set it to 0 */
614 vc->vt_mode.frsig = 0;
Eric W. Biederman8b6312f2007-02-10 01:44:34 -0800615 put_pid(vc->vt_pid);
616 vc->vt_pid = get_pid(task_pid(current));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700617 /* no switch is required -- saw@shade.msu.ru */
618 vc->vt_newvt = -1;
Torben Hohnac751ef2011-01-25 15:07:35 -0800619 console_unlock();
Alan Cox9cc3c222008-04-30 00:53:26 -0700620 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700621 }
622
623 case VT_GETMODE:
624 {
625 struct vt_mode tmp;
626 int rc;
627
Torben Hohnac751ef2011-01-25 15:07:35 -0800628 console_lock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700629 memcpy(&tmp, &vc->vt_mode, sizeof(struct vt_mode));
Torben Hohnac751ef2011-01-25 15:07:35 -0800630 console_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700631
632 rc = copy_to_user(up, &tmp, sizeof(struct vt_mode));
Alan Cox9cc3c222008-04-30 00:53:26 -0700633 if (rc)
634 ret = -EFAULT;
635 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700636 }
637
638 /*
639 * Returns global vt state. Note that VT 0 is always open, since
640 * it's an alias for the current VT, and people can't use it here.
641 * We cannot return state for more than 16 VTs, since v_state is short.
642 */
643 case VT_GETSTATE:
644 {
645 struct vt_stat __user *vtstat = up;
646 unsigned short state, mask;
647
Alan Cox4001d7b2012-03-02 14:59:20 +0000648 /* Review: FIXME: Console lock ? */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700649 if (put_user(fg_console + 1, &vtstat->v_active))
Alan Cox9cc3c222008-04-30 00:53:26 -0700650 ret = -EFAULT;
651 else {
652 state = 1; /* /dev/tty0 is always open */
653 for (i = 0, mask = 2; i < MAX_NR_CONSOLES && mask;
654 ++i, mask <<= 1)
655 if (VT_IS_IN_USE(i))
656 state |= mask;
657 ret = put_user(state, &vtstat->v_state);
658 }
659 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700660 }
661
662 /*
663 * Returns the first available (non-opened) console.
664 */
665 case VT_OPENQRY:
Alan Cox4001d7b2012-03-02 14:59:20 +0000666 /* FIXME: locking ? - but then this is a stupid API */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700667 for (i = 0; i < MAX_NR_CONSOLES; ++i)
668 if (! VT_IS_IN_USE(i))
669 break;
Graham Gower1e0ad282010-10-27 15:33:00 -0700670 uival = i < MAX_NR_CONSOLES ? (i+1) : -1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700671 goto setint;
672
673 /*
674 * ioctl(fd, VT_ACTIVATE, num) will cause us to switch to vt # num,
675 * with num >= 1 (switches to vt 0, our console, are not allowed, just
676 * to preserve sanity).
677 */
678 case VT_ACTIVATE:
679 if (!perm)
Alan Cox4001d7b2012-03-02 14:59:20 +0000680 return -EPERM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700681 if (arg == 0 || arg > MAX_NR_CONSOLES)
Alan Cox9cc3c222008-04-30 00:53:26 -0700682 ret = -ENXIO;
683 else {
684 arg--;
Torben Hohnac751ef2011-01-25 15:07:35 -0800685 console_lock();
Alan Cox9cc3c222008-04-30 00:53:26 -0700686 ret = vc_allocate(arg);
Torben Hohnac751ef2011-01-25 15:07:35 -0800687 console_unlock();
Alan Cox9cc3c222008-04-30 00:53:26 -0700688 if (ret)
689 break;
690 set_console(arg);
691 }
692 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700693
Alan Coxd3b5cff2009-09-19 13:13:26 -0700694 case VT_SETACTIVATE:
695 {
696 struct vt_setactivate vsa;
697
698 if (!perm)
Alan Cox4001d7b2012-03-02 14:59:20 +0000699 return -EPERM;
Alan Coxd3b5cff2009-09-19 13:13:26 -0700700
701 if (copy_from_user(&vsa, (struct vt_setactivate __user *)arg,
Jiri Slabya09efb02009-10-01 15:43:59 -0700702 sizeof(struct vt_setactivate))) {
703 ret = -EFAULT;
704 goto out;
705 }
Alan Coxd3b5cff2009-09-19 13:13:26 -0700706 if (vsa.console == 0 || vsa.console > MAX_NR_CONSOLES)
707 ret = -ENXIO;
708 else {
709 vsa.console--;
Torben Hohnac751ef2011-01-25 15:07:35 -0800710 console_lock();
Alan Coxd3b5cff2009-09-19 13:13:26 -0700711 ret = vc_allocate(vsa.console);
712 if (ret == 0) {
713 struct vc_data *nvc;
714 /* This is safe providing we don't drop the
715 console sem between vc_allocate and
716 finishing referencing nvc */
717 nvc = vc_cons[vsa.console].d;
718 nvc->vt_mode = vsa.mode;
719 nvc->vt_mode.frsig = 0;
720 put_pid(nvc->vt_pid);
721 nvc->vt_pid = get_pid(task_pid(current));
722 }
Torben Hohnac751ef2011-01-25 15:07:35 -0800723 console_unlock();
Alan Coxd3b5cff2009-09-19 13:13:26 -0700724 if (ret)
725 break;
726 /* Commence switch and lock */
Alan Cox4001d7b2012-03-02 14:59:20 +0000727 /* Review set_console locks */
Jiri Olsad6378372011-02-11 15:39:28 +0100728 set_console(vsa.console);
Alan Coxd3b5cff2009-09-19 13:13:26 -0700729 }
Jiri Olsad6378372011-02-11 15:39:28 +0100730 break;
Alan Coxd3b5cff2009-09-19 13:13:26 -0700731 }
732
Linus Torvalds1da177e2005-04-16 15:20:36 -0700733 /*
734 * wait until the specified VT has been activated
735 */
736 case VT_WAITACTIVE:
737 if (!perm)
Alan Cox4001d7b2012-03-02 14:59:20 +0000738 return -EPERM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700739 if (arg == 0 || arg > MAX_NR_CONSOLES)
Alan Cox9cc3c222008-04-30 00:53:26 -0700740 ret = -ENXIO;
Alan Cox99cceb4e2012-03-02 14:59:49 +0000741 else
Alan Cox8b92e872009-09-19 13:13:24 -0700742 ret = vt_waitactive(arg);
Alan Cox9cc3c222008-04-30 00:53:26 -0700743 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700744
745 /*
746 * If a vt is under process control, the kernel will not switch to it
747 * immediately, but postpone the operation until the process calls this
748 * ioctl, allowing the switch to complete.
749 *
750 * According to the X sources this is the behavior:
751 * 0: pending switch-from not OK
752 * 1: pending switch-from OK
753 * 2: completed switch-to OK
754 */
755 case VT_RELDISP:
756 if (!perm)
Alan Cox4001d7b2012-03-02 14:59:20 +0000757 return -EPERM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700758
Alan Cox4001d7b2012-03-02 14:59:20 +0000759 console_lock();
Alan Cox9cc3c222008-04-30 00:53:26 -0700760 if (vc->vt_mode.mode != VT_PROCESS) {
Alan Cox4001d7b2012-03-02 14:59:20 +0000761 console_unlock();
Alan Cox9cc3c222008-04-30 00:53:26 -0700762 ret = -EINVAL;
763 break;
764 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700765 /*
766 * Switching-from response
767 */
768 if (vc->vt_newvt >= 0) {
769 if (arg == 0)
770 /*
771 * Switch disallowed, so forget we were trying
772 * to do it.
773 */
774 vc->vt_newvt = -1;
775
776 else {
777 /*
778 * The current vt has been released, so
779 * complete the switch.
780 */
781 int newvt;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700782 newvt = vc->vt_newvt;
783 vc->vt_newvt = -1;
Alan Cox9cc3c222008-04-30 00:53:26 -0700784 ret = vc_allocate(newvt);
785 if (ret) {
Torben Hohnac751ef2011-01-25 15:07:35 -0800786 console_unlock();
Alan Cox9cc3c222008-04-30 00:53:26 -0700787 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700788 }
789 /*
790 * When we actually do the console switch,
791 * make sure we are atomic with respect to
792 * other console switches..
793 */
794 complete_change_console(vc_cons[newvt].d);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700795 }
Alan Cox9cc3c222008-04-30 00:53:26 -0700796 } else {
797 /*
798 * Switched-to response
799 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700800 /*
801 * If it's just an ACK, ignore it
802 */
Alan Cox9cc3c222008-04-30 00:53:26 -0700803 if (arg != VT_ACKACQ)
804 ret = -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700805 }
Torben Hohnac751ef2011-01-25 15:07:35 -0800806 console_unlock();
Alan Cox9cc3c222008-04-30 00:53:26 -0700807 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700808
809 /*
810 * Disallocate memory associated to VT (but leave VT1)
811 */
812 case VT_DISALLOCATE:
Alan Cox9cc3c222008-04-30 00:53:26 -0700813 if (arg > MAX_NR_CONSOLES) {
814 ret = -ENXIO;
815 break;
816 }
Peter Hurley421b40a2013-05-17 12:41:03 -0400817 if (arg == 0)
818 vt_disallocate_all();
819 else
820 ret = vt_disallocate(--arg);
Alan Cox9cc3c222008-04-30 00:53:26 -0700821 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700822
823 case VT_RESIZE:
824 {
825 struct vt_sizes __user *vtsizes = up;
Antonino A. Daplase400b6e2007-10-16 01:29:35 -0700826 struct vc_data *vc;
827
Linus Torvalds1da177e2005-04-16 15:20:36 -0700828 ushort ll,cc;
829 if (!perm)
Alan Cox4001d7b2012-03-02 14:59:20 +0000830 return -EPERM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700831 if (get_user(ll, &vtsizes->v_rows) ||
832 get_user(cc, &vtsizes->v_cols))
Alan Cox9cc3c222008-04-30 00:53:26 -0700833 ret = -EFAULT;
834 else {
Torben Hohnac751ef2011-01-25 15:07:35 -0800835 console_lock();
Alan Cox9cc3c222008-04-30 00:53:26 -0700836 for (i = 0; i < MAX_NR_CONSOLES; i++) {
837 vc = vc_cons[i].d;
Antonino A. Daplase400b6e2007-10-16 01:29:35 -0700838
Alan Cox9cc3c222008-04-30 00:53:26 -0700839 if (vc) {
840 vc->vc_resize_user = 1;
Alan Cox4001d7b2012-03-02 14:59:20 +0000841 /* FIXME: review v tty lock */
Alan Cox8c9a9dd2008-08-15 10:39:38 +0100842 vc_resize(vc_cons[i].d, cc, ll);
Alan Cox9cc3c222008-04-30 00:53:26 -0700843 }
Antonino A. Daplase400b6e2007-10-16 01:29:35 -0700844 }
Torben Hohnac751ef2011-01-25 15:07:35 -0800845 console_unlock();
Antonino A. Daplase400b6e2007-10-16 01:29:35 -0700846 }
Alan Cox9cc3c222008-04-30 00:53:26 -0700847 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700848 }
849
850 case VT_RESIZEX:
851 {
852 struct vt_consize __user *vtconsize = up;
853 ushort ll,cc,vlin,clin,vcol,ccol;
854 if (!perm)
Alan Cox4001d7b2012-03-02 14:59:20 +0000855 return -EPERM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700856 if (!access_ok(VERIFY_READ, vtconsize,
Alan Cox9cc3c222008-04-30 00:53:26 -0700857 sizeof(struct vt_consize))) {
858 ret = -EFAULT;
859 break;
860 }
861 /* FIXME: Should check the copies properly */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700862 __get_user(ll, &vtconsize->v_rows);
863 __get_user(cc, &vtconsize->v_cols);
864 __get_user(vlin, &vtconsize->v_vlin);
865 __get_user(clin, &vtconsize->v_clin);
866 __get_user(vcol, &vtconsize->v_vcol);
867 __get_user(ccol, &vtconsize->v_ccol);
868 vlin = vlin ? vlin : vc->vc_scan_lines;
869 if (clin) {
870 if (ll) {
Alan Cox9cc3c222008-04-30 00:53:26 -0700871 if (ll != vlin/clin) {
872 /* Parameters don't add up */
873 ret = -EINVAL;
874 break;
875 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700876 } else
877 ll = vlin/clin;
878 }
879 if (vcol && ccol) {
880 if (cc) {
Alan Cox9cc3c222008-04-30 00:53:26 -0700881 if (cc != vcol/ccol) {
882 ret = -EINVAL;
883 break;
884 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700885 } else
886 cc = vcol/ccol;
887 }
888
Alan Cox9cc3c222008-04-30 00:53:26 -0700889 if (clin > 32) {
890 ret = -EINVAL;
891 break;
892 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700893
894 for (i = 0; i < MAX_NR_CONSOLES; i++) {
895 if (!vc_cons[i].d)
896 continue;
Torben Hohnac751ef2011-01-25 15:07:35 -0800897 console_lock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700898 if (vlin)
899 vc_cons[i].d->vc_scan_lines = vlin;
900 if (clin)
901 vc_cons[i].d->vc_font.height = clin;
Antonino A. Daplase400b6e2007-10-16 01:29:35 -0700902 vc_cons[i].d->vc_resize_user = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700903 vc_resize(vc_cons[i].d, cc, ll);
Torben Hohnac751ef2011-01-25 15:07:35 -0800904 console_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700905 }
Alan Cox9cc3c222008-04-30 00:53:26 -0700906 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700907 }
908
909 case PIO_FONT: {
910 if (!perm)
Alan Cox4001d7b2012-03-02 14:59:20 +0000911 return -EPERM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700912 op.op = KD_FONT_OP_SET;
913 op.flags = KD_FONT_FLAG_OLD | KD_FONT_FLAG_DONT_RECALC; /* Compatibility */
914 op.width = 8;
915 op.height = 0;
916 op.charcount = 256;
917 op.data = up;
Alan Cox9cc3c222008-04-30 00:53:26 -0700918 ret = con_font_op(vc_cons[fg_console].d, &op);
919 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700920 }
921
922 case GIO_FONT: {
923 op.op = KD_FONT_OP_GET;
924 op.flags = KD_FONT_FLAG_OLD;
925 op.width = 8;
926 op.height = 32;
927 op.charcount = 256;
928 op.data = up;
Alan Cox9cc3c222008-04-30 00:53:26 -0700929 ret = con_font_op(vc_cons[fg_console].d, &op);
930 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700931 }
932
933 case PIO_CMAP:
934 if (!perm)
Alan Cox9cc3c222008-04-30 00:53:26 -0700935 ret = -EPERM;
936 else
937 ret = con_set_cmap(up);
938 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700939
940 case GIO_CMAP:
Alan Cox9cc3c222008-04-30 00:53:26 -0700941 ret = con_get_cmap(up);
942 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700943
944 case PIO_FONTX:
945 case GIO_FONTX:
Alan Cox9cc3c222008-04-30 00:53:26 -0700946 ret = do_fontx_ioctl(cmd, up, perm, &op);
947 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700948
949 case PIO_FONTRESET:
950 {
951 if (!perm)
Alan Cox4001d7b2012-03-02 14:59:20 +0000952 return -EPERM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700953
954#ifdef BROKEN_GRAPHICS_PROGRAMS
955 /* With BROKEN_GRAPHICS_PROGRAMS defined, the default
956 font is not saved. */
Alan Cox9cc3c222008-04-30 00:53:26 -0700957 ret = -ENOSYS;
958 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700959#else
960 {
961 op.op = KD_FONT_OP_SET_DEFAULT;
962 op.data = NULL;
Alan Cox9cc3c222008-04-30 00:53:26 -0700963 ret = con_font_op(vc_cons[fg_console].d, &op);
964 if (ret)
965 break;
Alan Cox5d1a33f2012-04-24 11:06:06 +0100966 console_lock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700967 con_set_default_unimap(vc_cons[fg_console].d);
Alan Cox5d1a33f2012-04-24 11:06:06 +0100968 console_unlock();
Alan Cox9cc3c222008-04-30 00:53:26 -0700969 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700970 }
971#endif
972 }
973
974 case KDFONTOP: {
Alan Cox9cc3c222008-04-30 00:53:26 -0700975 if (copy_from_user(&op, up, sizeof(op))) {
976 ret = -EFAULT;
977 break;
978 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700979 if (!perm && op.op != KD_FONT_OP_GET)
Alan Cox4001d7b2012-03-02 14:59:20 +0000980 return -EPERM;
Alan Cox9cc3c222008-04-30 00:53:26 -0700981 ret = con_font_op(vc, &op);
982 if (ret)
983 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700984 if (copy_to_user(up, &op, sizeof(op)))
Alan Cox9cc3c222008-04-30 00:53:26 -0700985 ret = -EFAULT;
986 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700987 }
988
989 case PIO_SCRNMAP:
990 if (!perm)
Alan Cox9cc3c222008-04-30 00:53:26 -0700991 ret = -EPERM;
Alan Cox5d1a33f2012-04-24 11:06:06 +0100992 else
Alan Cox9cc3c222008-04-30 00:53:26 -0700993 ret = con_set_trans_old(up);
994 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700995
996 case GIO_SCRNMAP:
Alan Cox9cc3c222008-04-30 00:53:26 -0700997 ret = con_get_trans_old(up);
998 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700999
1000 case PIO_UNISCRNMAP:
1001 if (!perm)
Alan Cox9cc3c222008-04-30 00:53:26 -07001002 ret = -EPERM;
Alan Cox5d1a33f2012-04-24 11:06:06 +01001003 else
Alan Cox9cc3c222008-04-30 00:53:26 -07001004 ret = con_set_trans_new(up);
1005 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001006
1007 case GIO_UNISCRNMAP:
Alan Cox9cc3c222008-04-30 00:53:26 -07001008 ret = con_get_trans_new(up);
1009 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001010
1011 case PIO_UNIMAPCLR:
1012 { struct unimapinit ui;
1013 if (!perm)
Alan Cox4001d7b2012-03-02 14:59:20 +00001014 return -EPERM;
Alan Cox9cc3c222008-04-30 00:53:26 -07001015 ret = copy_from_user(&ui, up, sizeof(struct unimapinit));
Dan Carpenter3fde85d2010-06-04 12:20:46 +02001016 if (ret)
1017 ret = -EFAULT;
Alan Cox5d1a33f2012-04-24 11:06:06 +01001018 else
Alan Cox9cc3c222008-04-30 00:53:26 -07001019 con_clear_unimap(vc, &ui);
1020 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001021 }
1022
1023 case PIO_UNIMAP:
1024 case GIO_UNIMAP:
Alan Cox9cc3c222008-04-30 00:53:26 -07001025 ret = do_unimap_ioctl(cmd, up, perm, vc);
1026 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001027
1028 case VT_LOCKSWITCH:
1029 if (!capable(CAP_SYS_TTY_CONFIG))
Alan Cox4001d7b2012-03-02 14:59:20 +00001030 return -EPERM;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001031 vt_dont_switch = 1;
Alan Cox9cc3c222008-04-30 00:53:26 -07001032 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001033 case VT_UNLOCKSWITCH:
1034 if (!capable(CAP_SYS_TTY_CONFIG))
Alan Cox4001d7b2012-03-02 14:59:20 +00001035 return -EPERM;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001036 vt_dont_switch = 0;
Alan Cox9cc3c222008-04-30 00:53:26 -07001037 break;
Samuel Thibault533475d2006-08-27 01:23:39 -07001038 case VT_GETHIFONTMASK:
Alan Cox9cc3c222008-04-30 00:53:26 -07001039 ret = put_user(vc->vc_hi_font_mask,
1040 (unsigned short __user *)arg);
1041 break;
Alan Cox8b92e872009-09-19 13:13:24 -07001042 case VT_WAITEVENT:
1043 ret = vt_event_wait_ioctl((struct vt_event __user *)arg);
1044 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001045 default:
Alan Cox9cc3c222008-04-30 00:53:26 -07001046 ret = -ENOIOCTLCMD;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001047 }
Alan Cox9cc3c222008-04-30 00:53:26 -07001048out:
Alan Cox9cc3c222008-04-30 00:53:26 -07001049 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001050}
1051
Linus Torvalds1da177e2005-04-16 15:20:36 -07001052void reset_vc(struct vc_data *vc)
1053{
1054 vc->vc_mode = KD_TEXT;
Alan Cox079c9532012-02-28 14:49:23 +00001055 vt_reset_unicode(vc->vc_num);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001056 vc->vt_mode.mode = VT_AUTO;
1057 vc->vt_mode.waitv = 0;
1058 vc->vt_mode.relsig = 0;
1059 vc->vt_mode.acqsig = 0;
1060 vc->vt_mode.frsig = 0;
Eric W. Biederman8b6312f2007-02-10 01:44:34 -08001061 put_pid(vc->vt_pid);
1062 vc->vt_pid = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001063 vc->vt_newvt = -1;
1064 if (!in_interrupt()) /* Via keyboard.c:SAK() - akpm */
1065 reset_palette(vc);
1066}
1067
Eric W. Biederman8b6312f2007-02-10 01:44:34 -08001068void vc_SAK(struct work_struct *work)
1069{
1070 struct vc *vc_con =
1071 container_of(work, struct vc, SAK_work);
1072 struct vc_data *vc;
1073 struct tty_struct *tty;
1074
Torben Hohnac751ef2011-01-25 15:07:35 -08001075 console_lock();
Eric W. Biederman8b6312f2007-02-10 01:44:34 -08001076 vc = vc_con->d;
1077 if (vc) {
Alan Cox079c9532012-02-28 14:49:23 +00001078 /* FIXME: review tty ref counting */
Alan Cox8ce73262010-06-01 22:52:56 +02001079 tty = vc->port.tty;
Eric W. Biederman8b6312f2007-02-10 01:44:34 -08001080 /*
1081 * SAK should also work in all raw modes and reset
1082 * them properly.
1083 */
1084 if (tty)
1085 __do_SAK(tty);
1086 reset_vc(vc);
1087 }
Torben Hohnac751ef2011-01-25 15:07:35 -08001088 console_unlock();
Eric W. Biederman8b6312f2007-02-10 01:44:34 -08001089}
1090
Arnd Bergmanne9216652009-08-06 15:09:28 +02001091#ifdef CONFIG_COMPAT
1092
1093struct compat_consolefontdesc {
1094 unsigned short charcount; /* characters in font (256 or 512) */
1095 unsigned short charheight; /* scan lines per character (1-32) */
1096 compat_caddr_t chardata; /* font data in expanded form */
1097};
1098
1099static inline int
1100compat_fontx_ioctl(int cmd, struct compat_consolefontdesc __user *user_cfd,
1101 int perm, struct console_font_op *op)
1102{
1103 struct compat_consolefontdesc cfdarg;
1104 int i;
1105
1106 if (copy_from_user(&cfdarg, user_cfd, sizeof(struct compat_consolefontdesc)))
1107 return -EFAULT;
1108
1109 switch (cmd) {
1110 case PIO_FONTX:
1111 if (!perm)
1112 return -EPERM;
1113 op->op = KD_FONT_OP_SET;
1114 op->flags = KD_FONT_FLAG_OLD;
1115 op->width = 8;
1116 op->height = cfdarg.charheight;
1117 op->charcount = cfdarg.charcount;
1118 op->data = compat_ptr(cfdarg.chardata);
1119 return con_font_op(vc_cons[fg_console].d, op);
1120 case GIO_FONTX:
1121 op->op = KD_FONT_OP_GET;
1122 op->flags = KD_FONT_FLAG_OLD;
1123 op->width = 8;
1124 op->height = cfdarg.charheight;
1125 op->charcount = cfdarg.charcount;
1126 op->data = compat_ptr(cfdarg.chardata);
1127 i = con_font_op(vc_cons[fg_console].d, op);
1128 if (i)
1129 return i;
1130 cfdarg.charheight = op->height;
1131 cfdarg.charcount = op->charcount;
1132 if (copy_to_user(user_cfd, &cfdarg, sizeof(struct compat_consolefontdesc)))
1133 return -EFAULT;
1134 return 0;
1135 }
1136 return -EINVAL;
1137}
1138
1139struct compat_console_font_op {
1140 compat_uint_t op; /* operation code KD_FONT_OP_* */
1141 compat_uint_t flags; /* KD_FONT_FLAG_* */
1142 compat_uint_t width, height; /* font size */
1143 compat_uint_t charcount;
1144 compat_caddr_t data; /* font data with height fixed to 32 */
1145};
1146
1147static inline int
1148compat_kdfontop_ioctl(struct compat_console_font_op __user *fontop,
1149 int perm, struct console_font_op *op, struct vc_data *vc)
1150{
1151 int i;
1152
1153 if (copy_from_user(op, fontop, sizeof(struct compat_console_font_op)))
1154 return -EFAULT;
1155 if (!perm && op->op != KD_FONT_OP_GET)
1156 return -EPERM;
1157 op->data = compat_ptr(((struct compat_console_font_op *)op)->data);
Arnd Bergmanne9216652009-08-06 15:09:28 +02001158 i = con_font_op(vc, op);
1159 if (i)
1160 return i;
1161 ((struct compat_console_font_op *)op)->data = (unsigned long)op->data;
1162 if (copy_to_user(fontop, op, sizeof(struct compat_console_font_op)))
1163 return -EFAULT;
1164 return 0;
1165}
1166
1167struct compat_unimapdesc {
1168 unsigned short entry_ct;
1169 compat_caddr_t entries;
1170};
1171
1172static inline int
1173compat_unimap_ioctl(unsigned int cmd, struct compat_unimapdesc __user *user_ud,
1174 int perm, struct vc_data *vc)
1175{
1176 struct compat_unimapdesc tmp;
1177 struct unipair __user *tmp_entries;
1178
1179 if (copy_from_user(&tmp, user_ud, sizeof tmp))
1180 return -EFAULT;
1181 tmp_entries = compat_ptr(tmp.entries);
1182 if (tmp_entries)
1183 if (!access_ok(VERIFY_WRITE, tmp_entries,
1184 tmp.entry_ct*sizeof(struct unipair)))
1185 return -EFAULT;
1186 switch (cmd) {
1187 case PIO_UNIMAP:
1188 if (!perm)
1189 return -EPERM;
1190 return con_set_unimap(vc, tmp.entry_ct, tmp_entries);
1191 case GIO_UNIMAP:
1192 if (!perm && fg_console != vc->vc_num)
1193 return -EPERM;
1194 return con_get_unimap(vc, tmp.entry_ct, &(user_ud->entry_ct), tmp_entries);
1195 }
1196 return 0;
1197}
1198
Alan Cox6caa76b2011-02-14 16:27:22 +00001199long vt_compat_ioctl(struct tty_struct *tty,
Arnd Bergmanne9216652009-08-06 15:09:28 +02001200 unsigned int cmd, unsigned long arg)
1201{
1202 struct vc_data *vc = tty->driver_data;
1203 struct console_font_op op; /* used in multiple places here */
Arnd Bergmanne9216652009-08-06 15:09:28 +02001204 unsigned int console;
1205 void __user *up = (void __user *)arg;
1206 int perm;
1207 int ret = 0;
1208
1209 console = vc->vc_num;
1210
Arnd Bergmanne9216652009-08-06 15:09:28 +02001211 if (!vc_cons_allocated(console)) { /* impossible? */
1212 ret = -ENOIOCTLCMD;
1213 goto out;
1214 }
1215
1216 /*
1217 * To have permissions to do most of the vt ioctls, we either have
1218 * to be the owner of the tty, or have CAP_SYS_TTY_CONFIG.
1219 */
1220 perm = 0;
1221 if (current->signal->tty == tty || capable(CAP_SYS_TTY_CONFIG))
1222 perm = 1;
1223
Arnd Bergmanne9216652009-08-06 15:09:28 +02001224 switch (cmd) {
1225 /*
1226 * these need special handlers for incompatible data structures
1227 */
1228 case PIO_FONTX:
1229 case GIO_FONTX:
1230 ret = compat_fontx_ioctl(cmd, up, perm, &op);
1231 break;
1232
1233 case KDFONTOP:
1234 ret = compat_kdfontop_ioctl(up, perm, &op, vc);
1235 break;
1236
1237 case PIO_UNIMAP:
1238 case GIO_UNIMAP:
Andreas Schwab4b1fe772009-09-28 20:10:02 +02001239 ret = compat_unimap_ioctl(cmd, up, perm, vc);
Arnd Bergmanne9216652009-08-06 15:09:28 +02001240 break;
1241
1242 /*
1243 * all these treat 'arg' as an integer
1244 */
1245 case KIOCSOUND:
1246 case KDMKTONE:
1247#ifdef CONFIG_X86
1248 case KDADDIO:
1249 case KDDELIO:
1250#endif
1251 case KDSETMODE:
1252 case KDMAPDISP:
1253 case KDUNMAPDISP:
1254 case KDSKBMODE:
1255 case KDSKBMETA:
1256 case KDSKBLED:
1257 case KDSETLED:
1258 case KDSIGACCEPT:
1259 case VT_ACTIVATE:
1260 case VT_WAITACTIVE:
1261 case VT_RELDISP:
1262 case VT_DISALLOCATE:
1263 case VT_RESIZE:
1264 case VT_RESIZEX:
1265 goto fallback;
1266
1267 /*
1268 * the rest has a compatible data structure behind arg,
1269 * but we have to convert it to a proper 64 bit pointer.
1270 */
1271 default:
1272 arg = (unsigned long)compat_ptr(arg);
1273 goto fallback;
1274 }
1275out:
Arnd Bergmanne9216652009-08-06 15:09:28 +02001276 return ret;
1277
1278fallback:
Alan Cox6caa76b2011-02-14 16:27:22 +00001279 return vt_ioctl(tty, cmd, arg);
Arnd Bergmanne9216652009-08-06 15:09:28 +02001280}
1281
1282
1283#endif /* CONFIG_COMPAT */
1284
1285
Linus Torvalds1da177e2005-04-16 15:20:36 -07001286/*
Alan Coxd3b5cff2009-09-19 13:13:26 -07001287 * Performs the back end of a vt switch. Called under the console
1288 * semaphore.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001289 */
1290static void complete_change_console(struct vc_data *vc)
1291{
1292 unsigned char old_vc_mode;
Alan Cox8b92e872009-09-19 13:13:24 -07001293 int old = fg_console;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001294
1295 last_console = fg_console;
1296
1297 /*
1298 * If we're switching, we could be going from KD_GRAPHICS to
1299 * KD_TEXT mode or vice versa, which means we need to blank or
1300 * unblank the screen later.
1301 */
1302 old_vc_mode = vc_cons[fg_console].d->vc_mode;
1303 switch_screen(vc);
1304
1305 /*
Eric W. Biederman3dfcaf162006-12-13 00:34:05 -08001306 * This can't appear below a successful kill_pid(). If it did,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001307 * then the *blank_screen operation could occur while X, having
1308 * received acqsig, is waking up on another processor. This
1309 * condition can lead to overlapping accesses to the VGA range
1310 * and the framebuffer (causing system lockups).
1311 *
1312 * To account for this we duplicate this code below only if the
1313 * controlling process is gone and we've called reset_vc.
1314 */
1315 if (old_vc_mode != vc->vc_mode) {
1316 if (vc->vc_mode == KD_TEXT)
1317 do_unblank_screen(1);
1318 else
1319 do_blank_screen(1);
1320 }
1321
1322 /*
1323 * If this new console is under process control, send it a signal
1324 * telling it that it has acquired. Also check if it has died and
1325 * clean up (similar to logic employed in change_console())
1326 */
Greg Kroah-Hartman87a6aca2010-03-15 17:14:15 -07001327 if (vc->vt_mode.mode == VT_PROCESS) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001328 /*
Eric W. Biederman3dfcaf162006-12-13 00:34:05 -08001329 * Send the signal as privileged - kill_pid() will
Linus Torvalds1da177e2005-04-16 15:20:36 -07001330 * tell us if the process has gone or something else
1331 * is awry
1332 */
Eric W. Biedermanbde0d2c92006-10-02 02:17:14 -07001333 if (kill_pid(vc->vt_pid, vc->vt_mode.acqsig, 1) != 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001334 /*
1335 * The controlling process has died, so we revert back to
1336 * normal operation. In this case, we'll also change back
1337 * to KD_TEXT mode. I'm not sure if this is strictly correct
1338 * but it saves the agony when the X server dies and the screen
1339 * remains blanked due to KD_GRAPHICS! It would be nice to do
1340 * this outside of VT_PROCESS but there is no single process
1341 * to account for and tracking tty count may be undesirable.
1342 */
1343 reset_vc(vc);
1344
1345 if (old_vc_mode != vc->vc_mode) {
1346 if (vc->vc_mode == KD_TEXT)
1347 do_unblank_screen(1);
1348 else
1349 do_blank_screen(1);
1350 }
1351 }
1352 }
1353
1354 /*
1355 * Wake anyone waiting for their VT to activate
1356 */
Alan Cox8b92e872009-09-19 13:13:24 -07001357 vt_event_post(VT_EVENT_SWITCH, old, vc->vc_num);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001358 return;
1359}
1360
1361/*
1362 * Performs the front-end of a vt switch
1363 */
1364void change_console(struct vc_data *new_vc)
1365{
1366 struct vc_data *vc;
1367
1368 if (!new_vc || new_vc->vc_num == fg_console || vt_dont_switch)
1369 return;
1370
1371 /*
1372 * If this vt is in process mode, then we need to handshake with
1373 * that process before switching. Essentially, we store where that
1374 * vt wants to switch to and wait for it to tell us when it's done
1375 * (via VT_RELDISP ioctl).
1376 *
1377 * We also check to see if the controlling process still exists.
1378 * If it doesn't, we reset this vt to auto mode and continue.
1379 * This is a cheap way to track process control. The worst thing
1380 * that can happen is: we send a signal to a process, it dies, and
1381 * the switch gets "lost" waiting for a response; hopefully, the
1382 * user will try again, we'll detect the process is gone (unless
1383 * the user waits just the right amount of time :-) and revert the
1384 * vt to auto control.
1385 */
1386 vc = vc_cons[fg_console].d;
Greg Kroah-Hartman87a6aca2010-03-15 17:14:15 -07001387 if (vc->vt_mode.mode == VT_PROCESS) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001388 /*
Eric W. Biederman3dfcaf162006-12-13 00:34:05 -08001389 * Send the signal as privileged - kill_pid() will
Linus Torvalds1da177e2005-04-16 15:20:36 -07001390 * tell us if the process has gone or something else
Jan Lübbea64314e2007-09-29 18:47:51 +02001391 * is awry.
1392 *
1393 * We need to set vt_newvt *before* sending the signal or we
1394 * have a race.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001395 */
Jan Lübbea64314e2007-09-29 18:47:51 +02001396 vc->vt_newvt = new_vc->vc_num;
Eric W. Biedermanbde0d2c92006-10-02 02:17:14 -07001397 if (kill_pid(vc->vt_pid, vc->vt_mode.relsig, 1) == 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001398 /*
Greg Kroah-Hartman87a6aca2010-03-15 17:14:15 -07001399 * It worked. Mark the vt to switch to and
1400 * return. The process needs to send us a
1401 * VT_RELDISP ioctl to complete the switch.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001402 */
Greg Kroah-Hartman87a6aca2010-03-15 17:14:15 -07001403 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001404 }
1405
1406 /*
Greg Kroah-Hartman87a6aca2010-03-15 17:14:15 -07001407 * The controlling process has died, so we revert back to
1408 * normal operation. In this case, we'll also change back
1409 * to KD_TEXT mode. I'm not sure if this is strictly correct
1410 * but it saves the agony when the X server dies and the screen
1411 * remains blanked due to KD_GRAPHICS! It would be nice to do
1412 * this outside of VT_PROCESS but there is no single process
1413 * to account for and tracking tty count may be undesirable.
1414 */
1415 reset_vc(vc);
1416
1417 /*
1418 * Fall through to normal (VT_AUTO) handling of the switch...
Linus Torvalds1da177e2005-04-16 15:20:36 -07001419 */
1420 }
1421
1422 /*
1423 * Ignore all switches in KD_GRAPHICS+VT_AUTO mode
1424 */
1425 if (vc->vc_mode == KD_GRAPHICS)
1426 return;
1427
1428 complete_change_console(new_vc);
1429}
Alan Cox8d233552009-09-19 13:13:25 -07001430
1431/* Perform a kernel triggered VT switch for suspend/resume */
1432
1433static int disable_vt_switch;
1434
1435int vt_move_to_console(unsigned int vt, int alloc)
1436{
1437 int prev;
1438
Torben Hohnac751ef2011-01-25 15:07:35 -08001439 console_lock();
Alan Cox8d233552009-09-19 13:13:25 -07001440 /* Graphics mode - up to X */
1441 if (disable_vt_switch) {
Torben Hohnac751ef2011-01-25 15:07:35 -08001442 console_unlock();
Alan Cox8d233552009-09-19 13:13:25 -07001443 return 0;
1444 }
1445 prev = fg_console;
1446
1447 if (alloc && vc_allocate(vt)) {
1448 /* we can't have a free VC for now. Too bad,
1449 * we don't want to mess the screen for now. */
Torben Hohnac751ef2011-01-25 15:07:35 -08001450 console_unlock();
Alan Cox8d233552009-09-19 13:13:25 -07001451 return -ENOSPC;
1452 }
1453
1454 if (set_console(vt)) {
1455 /*
1456 * We're unable to switch to the SUSPEND_CONSOLE.
1457 * Let the calling function know so it can decide
1458 * what to do.
1459 */
Torben Hohnac751ef2011-01-25 15:07:35 -08001460 console_unlock();
Alan Cox8d233552009-09-19 13:13:25 -07001461 return -EIO;
1462 }
Torben Hohnac751ef2011-01-25 15:07:35 -08001463 console_unlock();
Jiri Slaby797938b2009-08-11 23:20:41 +02001464 if (vt_waitactive(vt + 1)) {
Alan Cox8d233552009-09-19 13:13:25 -07001465 pr_debug("Suspend: Can't switch VCs.");
1466 return -EINTR;
1467 }
1468 return prev;
1469}
1470
1471/*
1472 * Normally during a suspend, we allocate a new console and switch to it.
1473 * When we resume, we switch back to the original console. This switch
1474 * can be slow, so on systems where the framebuffer can handle restoration
1475 * of video registers anyways, there's little point in doing the console
1476 * switch. This function allows you to disable it by passing it '0'.
1477 */
1478void pm_set_vt_switch(int do_switch)
1479{
Torben Hohnac751ef2011-01-25 15:07:35 -08001480 console_lock();
Alan Cox8d233552009-09-19 13:13:25 -07001481 disable_vt_switch = !do_switch;
Torben Hohnac751ef2011-01-25 15:07:35 -08001482 console_unlock();
Alan Cox8d233552009-09-19 13:13:25 -07001483}
1484EXPORT_SYMBOL(pm_set_vt_switch);