blob: 97d5a74558a3a4477e3c5cfb29dd88591fefbe92 [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
Peter Hurley421b40a2013-05-17 12:41:03 -0400292 console_lock();
293 if (VT_BUSY(vc_num))
294 ret = -EBUSY;
Ross Lagerwallef223fb2013-06-14 23:24:25 +0100295 else if (vc_num)
Peter Hurley421b40a2013-05-17 12:41:03 -0400296 vc = vc_deallocate(vc_num);
297 console_unlock();
298
299 if (vc && vc_num >= MIN_NR_CONSOLES) {
300 tty_port_destroy(&vc->port);
301 kfree(vc);
302 }
303
304 return ret;
305}
306
307/* deallocate all unused consoles, but leave 0 */
308static void vt_disallocate_all(void)
309{
310 struct vc_data *vc[MAX_NR_CONSOLES];
311 int i;
312
313 console_lock();
314 for (i = 1; i < MAX_NR_CONSOLES; i++)
315 if (!VT_BUSY(i))
316 vc[i] = vc_deallocate(i);
317 else
318 vc[i] = NULL;
319 console_unlock();
320
321 for (i = 1; i < MAX_NR_CONSOLES; i++) {
322 if (vc[i] && i >= MIN_NR_CONSOLES) {
323 tty_port_destroy(&vc[i]->port);
324 kfree(vc[i]);
325 }
326 }
327}
Alan Cox8b92e872009-09-19 13:13:24 -0700328
329
Linus Torvalds1da177e2005-04-16 15:20:36 -0700330/*
331 * We handle the console-specific ioctl's here. We allow the
332 * capability to modify any console, not just the fg_console.
333 */
Alan Cox6caa76b2011-02-14 16:27:22 +0000334int vt_ioctl(struct tty_struct *tty,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700335 unsigned int cmd, unsigned long arg)
336{
Alan Coxc9f19e92009-01-02 13:47:26 +0000337 struct vc_data *vc = tty->driver_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700338 struct console_font_op op; /* used in multiple places here */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700339 unsigned int console;
340 unsigned char ucval;
Graham Gower1e0ad282010-10-27 15:33:00 -0700341 unsigned int uival;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700342 void __user *up = (void __user *)arg;
343 int i, perm;
Alan Cox9cc3c222008-04-30 00:53:26 -0700344 int ret = 0;
345
Linus Torvalds1da177e2005-04-16 15:20:36 -0700346 console = vc->vc_num;
347
Alan Cox9cc3c222008-04-30 00:53:26 -0700348
349 if (!vc_cons_allocated(console)) { /* impossible? */
350 ret = -ENOIOCTLCMD;
351 goto out;
352 }
353
Linus Torvalds1da177e2005-04-16 15:20:36 -0700354
355 /*
356 * To have permissions to do most of the vt ioctls, we either have
357 * to be the owner of the tty, or have CAP_SYS_TTY_CONFIG.
358 */
359 perm = 0;
360 if (current->signal->tty == tty || capable(CAP_SYS_TTY_CONFIG))
361 perm = 1;
362
Linus Torvalds1da177e2005-04-16 15:20:36 -0700363 switch (cmd) {
Alan Coxe6885102008-10-13 10:36:40 +0100364 case TIOCLINUX:
Jiri Slabya1159022009-06-22 18:42:18 +0100365 ret = tioclinux(tty, arg);
366 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700367 case KIOCSOUND:
368 if (!perm)
Alan Cox4001d7b2012-03-02 14:59:20 +0000369 return -EPERM;
Arnd Bergmann2c4e9672010-08-28 20:35:17 -0700370 /*
371 * The use of PIT_TICK_RATE is historic, it used to be
372 * the platform-dependent CLOCK_TICK_RATE between 2.6.12
373 * and 2.6.36, which was a minor but unfortunate ABI
Alan Cox4001d7b2012-03-02 14:59:20 +0000374 * change. kd_mksound is locked by the input layer.
Arnd Bergmann2c4e9672010-08-28 20:35:17 -0700375 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700376 if (arg)
Arnd Bergmann2c4e9672010-08-28 20:35:17 -0700377 arg = PIT_TICK_RATE / arg;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700378 kd_mksound(arg, 0);
Alan Cox9cc3c222008-04-30 00:53:26 -0700379 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700380
381 case KDMKTONE:
382 if (!perm)
Alan Cox4001d7b2012-03-02 14:59:20 +0000383 return -EPERM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700384 {
385 unsigned int ticks, count;
386
387 /*
388 * Generate the tone for the appropriate number of ticks.
389 * If the time is zero, turn off sound ourselves.
390 */
Nicholas Mc Guire4c0d9b12015-02-09 10:53:25 -0500391 ticks = msecs_to_jiffies((arg >> 16) & 0xffff);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700392 count = ticks ? (arg & 0xffff) : 0;
393 if (count)
Arnd Bergmann2c4e9672010-08-28 20:35:17 -0700394 count = PIT_TICK_RATE / count;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700395 kd_mksound(count, ticks);
Alan Cox9cc3c222008-04-30 00:53:26 -0700396 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700397 }
398
399 case KDGKBTYPE:
400 /*
Alan Cox4001d7b2012-03-02 14:59:20 +0000401 * this is naïve.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700402 */
403 ucval = KB_101;
Alan Cox079c9532012-02-28 14:49:23 +0000404 ret = put_user(ucval, (char __user *)arg);
405 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700406
407 /*
408 * These cannot be implemented on any machine that implements
409 * ioperm() in user level (such as Alpha PCs) or not at all.
410 *
411 * XXX: you should never use these, just call ioperm directly..
412 */
413#ifdef CONFIG_X86
414 case KDADDIO:
415 case KDDELIO:
416 /*
417 * KDADDIO and KDDELIO may be able to add ports beyond what
418 * we reject here, but to be safe...
Alan Cox4001d7b2012-03-02 14:59:20 +0000419 *
420 * These are locked internally via sys_ioperm
Linus Torvalds1da177e2005-04-16 15:20:36 -0700421 */
Alan Cox9cc3c222008-04-30 00:53:26 -0700422 if (arg < GPFIRST || arg > GPLAST) {
423 ret = -EINVAL;
424 break;
425 }
426 ret = sys_ioperm(arg, 1, (cmd == KDADDIO)) ? -ENXIO : 0;
427 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700428
429 case KDENABIO:
430 case KDDISABIO:
Alan Cox9cc3c222008-04-30 00:53:26 -0700431 ret = sys_ioperm(GPFIRST, GPNUM,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700432 (cmd == KDENABIO)) ? -ENXIO : 0;
Alan Cox9cc3c222008-04-30 00:53:26 -0700433 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700434#endif
435
436 /* Linux m68k/i386 interface for setting the keyboard delay/repeat rate */
437
438 case KDKBDREP:
439 {
440 struct kbd_repeat kbrep;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700441
442 if (!capable(CAP_SYS_TTY_CONFIG))
Alan Cox4001d7b2012-03-02 14:59:20 +0000443 return -EPERM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700444
Alan Cox9cc3c222008-04-30 00:53:26 -0700445 if (copy_from_user(&kbrep, up, sizeof(struct kbd_repeat))) {
446 ret = -EFAULT;
447 break;
448 }
449 ret = kbd_rate(&kbrep);
450 if (ret)
451 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700452 if (copy_to_user(up, &kbrep, sizeof(struct kbd_repeat)))
Alan Cox9cc3c222008-04-30 00:53:26 -0700453 ret = -EFAULT;
454 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700455 }
456
457 case KDSETMODE:
458 /*
459 * currently, setting the mode from KD_TEXT to KD_GRAPHICS
460 * doesn't do a whole lot. i'm not sure if it should do any
461 * restoration of modes or what...
462 *
463 * XXX It should at least call into the driver, fbdev's definitely
464 * need to restore their engine state. --BenH
465 */
466 if (!perm)
Alan Cox4001d7b2012-03-02 14:59:20 +0000467 return -EPERM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700468 switch (arg) {
469 case KD_GRAPHICS:
470 break;
471 case KD_TEXT0:
472 case KD_TEXT1:
473 arg = KD_TEXT;
474 case KD_TEXT:
475 break;
476 default:
Alan Cox9cc3c222008-04-30 00:53:26 -0700477 ret = -EINVAL;
478 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700479 }
Alan Cox4001d7b2012-03-02 14:59:20 +0000480 /* FIXME: this needs the console lock extending */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700481 if (vc->vc_mode == (unsigned char) arg)
Alan Cox9cc3c222008-04-30 00:53:26 -0700482 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700483 vc->vc_mode = (unsigned char) arg;
484 if (console != fg_console)
Alan Cox9cc3c222008-04-30 00:53:26 -0700485 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700486 /*
487 * explicitly blank/unblank the screen if switching modes
488 */
Torben Hohnac751ef2011-01-25 15:07:35 -0800489 console_lock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700490 if (arg == KD_TEXT)
491 do_unblank_screen(1);
492 else
493 do_blank_screen(1);
Torben Hohnac751ef2011-01-25 15:07:35 -0800494 console_unlock();
Alan Cox9cc3c222008-04-30 00:53:26 -0700495 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700496
497 case KDGETMODE:
Graham Gower1e0ad282010-10-27 15:33:00 -0700498 uival = vc->vc_mode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700499 goto setint;
500
501 case KDMAPDISP:
502 case KDUNMAPDISP:
503 /*
504 * these work like a combination of mmap and KDENABIO.
505 * this could be easily finished.
506 */
Alan Cox9cc3c222008-04-30 00:53:26 -0700507 ret = -EINVAL;
508 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700509
510 case KDSKBMODE:
511 if (!perm)
Alan Cox4001d7b2012-03-02 14:59:20 +0000512 return -EPERM;
Alan Cox079c9532012-02-28 14:49:23 +0000513 ret = vt_do_kdskbmode(console, arg);
514 if (ret == 0)
515 tty_ldisc_flush(tty);
Alan Cox9cc3c222008-04-30 00:53:26 -0700516 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700517
518 case KDGKBMODE:
Alan Cox079c9532012-02-28 14:49:23 +0000519 uival = vt_do_kdgkbmode(console);
520 ret = put_user(uival, (int __user *)arg);
521 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700522
523 /* this could be folded into KDSKBMODE, but for compatibility
524 reasons it is not so easy to fold KDGKBMETA into KDGKBMODE */
525 case KDSKBMETA:
Alan Cox079c9532012-02-28 14:49:23 +0000526 ret = vt_do_kdskbmeta(console, arg);
Alan Cox9cc3c222008-04-30 00:53:26 -0700527 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700528
529 case KDGKBMETA:
Alan Cox079c9532012-02-28 14:49:23 +0000530 /* FIXME: should review whether this is worth locking */
531 uival = vt_do_kdgkbmeta(console);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700532 setint:
Graham Gower1e0ad282010-10-27 15:33:00 -0700533 ret = put_user(uival, (int __user *)arg);
Alan Cox9cc3c222008-04-30 00:53:26 -0700534 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700535
536 case KDGETKEYCODE:
537 case KDSETKEYCODE:
538 if(!capable(CAP_SYS_TTY_CONFIG))
Alan Cox9cc3c222008-04-30 00:53:26 -0700539 perm = 0;
Alan Cox079c9532012-02-28 14:49:23 +0000540 ret = vt_do_kbkeycode_ioctl(cmd, up, perm);
Alan Cox9cc3c222008-04-30 00:53:26 -0700541 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700542
543 case KDGKBENT:
544 case KDSKBENT:
Alan Cox079c9532012-02-28 14:49:23 +0000545 ret = vt_do_kdsk_ioctl(cmd, up, perm, console);
Alan Cox9cc3c222008-04-30 00:53:26 -0700546 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700547
548 case KDGKBSENT:
549 case KDSKBSENT:
Alan Cox079c9532012-02-28 14:49:23 +0000550 ret = vt_do_kdgkb_ioctl(cmd, up, perm);
Alan Cox9cc3c222008-04-30 00:53:26 -0700551 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700552
Alan Cox247ff8e2012-02-24 12:47:11 +0000553 /* Diacritical processing. Handled in keyboard.c as it has
554 to operate on the keyboard locks and structures */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700555 case KDGKBDIACR:
Samuel Thibault04c71972007-10-16 23:27:04 -0700556 case KDGKBDIACRUC:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700557 case KDSKBDIACR:
Samuel Thibault04c71972007-10-16 23:27:04 -0700558 case KDSKBDIACRUC:
Alan Cox247ff8e2012-02-24 12:47:11 +0000559 ret = vt_do_diacrit(cmd, up, perm);
Alan Cox9cc3c222008-04-30 00:53:26 -0700560 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700561
562 /* the ioctls below read/set the flags usually shown in the leds */
563 /* don't use them - they will go away without warning */
564 case KDGKBLED:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700565 case KDSKBLED:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700566 case KDGETLED:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700567 case KDSETLED:
Alan Cox079c9532012-02-28 14:49:23 +0000568 ret = vt_do_kdskled(console, cmd, arg, perm);
Alan Cox9cc3c222008-04-30 00:53:26 -0700569 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700570
571 /*
572 * A process can indicate its willingness to accept signals
573 * generated by pressing an appropriate key combination.
574 * Thus, one can have a daemon that e.g. spawns a new console
575 * upon a keypress and then changes to it.
576 * See also the kbrequest field of inittab(5).
577 */
578 case KDSIGACCEPT:
579 {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700580 if (!perm || !capable(CAP_KILL))
Alan Cox4001d7b2012-03-02 14:59:20 +0000581 return -EPERM;
Jesper Juhl7ed20e12005-05-01 08:59:14 -0700582 if (!valid_signal(arg) || arg < 1 || arg == SIGKILL)
Alan Cox9cc3c222008-04-30 00:53:26 -0700583 ret = -EINVAL;
584 else {
585 spin_lock_irq(&vt_spawn_con.lock);
586 put_pid(vt_spawn_con.pid);
587 vt_spawn_con.pid = get_pid(task_pid(current));
588 vt_spawn_con.sig = arg;
589 spin_unlock_irq(&vt_spawn_con.lock);
590 }
591 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700592 }
593
594 case VT_SETMODE:
595 {
596 struct vt_mode tmp;
597
598 if (!perm)
Alan Cox4001d7b2012-03-02 14:59:20 +0000599 return -EPERM;
Alan Cox9cc3c222008-04-30 00:53:26 -0700600 if (copy_from_user(&tmp, up, sizeof(struct vt_mode))) {
601 ret = -EFAULT;
602 goto out;
603 }
Greg Kroah-Hartman87a6aca2010-03-15 17:14:15 -0700604 if (tmp.mode != VT_AUTO && tmp.mode != VT_PROCESS) {
Alan Cox9cc3c222008-04-30 00:53:26 -0700605 ret = -EINVAL;
606 goto out;
607 }
Torben Hohnac751ef2011-01-25 15:07:35 -0800608 console_lock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700609 vc->vt_mode = tmp;
610 /* the frsig is ignored, so we set it to 0 */
611 vc->vt_mode.frsig = 0;
Eric W. Biederman8b6312f2007-02-10 01:44:34 -0800612 put_pid(vc->vt_pid);
613 vc->vt_pid = get_pid(task_pid(current));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700614 /* no switch is required -- saw@shade.msu.ru */
615 vc->vt_newvt = -1;
Torben Hohnac751ef2011-01-25 15:07:35 -0800616 console_unlock();
Alan Cox9cc3c222008-04-30 00:53:26 -0700617 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700618 }
619
620 case VT_GETMODE:
621 {
622 struct vt_mode tmp;
623 int rc;
624
Torben Hohnac751ef2011-01-25 15:07:35 -0800625 console_lock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700626 memcpy(&tmp, &vc->vt_mode, sizeof(struct vt_mode));
Torben Hohnac751ef2011-01-25 15:07:35 -0800627 console_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700628
629 rc = copy_to_user(up, &tmp, sizeof(struct vt_mode));
Alan Cox9cc3c222008-04-30 00:53:26 -0700630 if (rc)
631 ret = -EFAULT;
632 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700633 }
634
635 /*
636 * Returns global vt state. Note that VT 0 is always open, since
637 * it's an alias for the current VT, and people can't use it here.
638 * We cannot return state for more than 16 VTs, since v_state is short.
639 */
640 case VT_GETSTATE:
641 {
642 struct vt_stat __user *vtstat = up;
643 unsigned short state, mask;
644
Alan Cox4001d7b2012-03-02 14:59:20 +0000645 /* Review: FIXME: Console lock ? */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700646 if (put_user(fg_console + 1, &vtstat->v_active))
Alan Cox9cc3c222008-04-30 00:53:26 -0700647 ret = -EFAULT;
648 else {
649 state = 1; /* /dev/tty0 is always open */
650 for (i = 0, mask = 2; i < MAX_NR_CONSOLES && mask;
651 ++i, mask <<= 1)
652 if (VT_IS_IN_USE(i))
653 state |= mask;
654 ret = put_user(state, &vtstat->v_state);
655 }
656 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700657 }
658
659 /*
660 * Returns the first available (non-opened) console.
661 */
662 case VT_OPENQRY:
Alan Cox4001d7b2012-03-02 14:59:20 +0000663 /* FIXME: locking ? - but then this is a stupid API */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700664 for (i = 0; i < MAX_NR_CONSOLES; ++i)
665 if (! VT_IS_IN_USE(i))
666 break;
Graham Gower1e0ad282010-10-27 15:33:00 -0700667 uival = i < MAX_NR_CONSOLES ? (i+1) : -1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700668 goto setint;
669
670 /*
671 * ioctl(fd, VT_ACTIVATE, num) will cause us to switch to vt # num,
672 * with num >= 1 (switches to vt 0, our console, are not allowed, just
673 * to preserve sanity).
674 */
675 case VT_ACTIVATE:
676 if (!perm)
Alan Cox4001d7b2012-03-02 14:59:20 +0000677 return -EPERM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700678 if (arg == 0 || arg > MAX_NR_CONSOLES)
Alan Cox9cc3c222008-04-30 00:53:26 -0700679 ret = -ENXIO;
680 else {
681 arg--;
Torben Hohnac751ef2011-01-25 15:07:35 -0800682 console_lock();
Alan Cox9cc3c222008-04-30 00:53:26 -0700683 ret = vc_allocate(arg);
Torben Hohnac751ef2011-01-25 15:07:35 -0800684 console_unlock();
Alan Cox9cc3c222008-04-30 00:53:26 -0700685 if (ret)
686 break;
687 set_console(arg);
688 }
689 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700690
Alan Coxd3b5cff2009-09-19 13:13:26 -0700691 case VT_SETACTIVATE:
692 {
693 struct vt_setactivate vsa;
694
695 if (!perm)
Alan Cox4001d7b2012-03-02 14:59:20 +0000696 return -EPERM;
Alan Coxd3b5cff2009-09-19 13:13:26 -0700697
698 if (copy_from_user(&vsa, (struct vt_setactivate __user *)arg,
Jiri Slabya09efb02009-10-01 15:43:59 -0700699 sizeof(struct vt_setactivate))) {
700 ret = -EFAULT;
701 goto out;
702 }
Alan Coxd3b5cff2009-09-19 13:13:26 -0700703 if (vsa.console == 0 || vsa.console > MAX_NR_CONSOLES)
704 ret = -ENXIO;
705 else {
706 vsa.console--;
Torben Hohnac751ef2011-01-25 15:07:35 -0800707 console_lock();
Alan Coxd3b5cff2009-09-19 13:13:26 -0700708 ret = vc_allocate(vsa.console);
709 if (ret == 0) {
710 struct vc_data *nvc;
711 /* This is safe providing we don't drop the
712 console sem between vc_allocate and
713 finishing referencing nvc */
714 nvc = vc_cons[vsa.console].d;
715 nvc->vt_mode = vsa.mode;
716 nvc->vt_mode.frsig = 0;
717 put_pid(nvc->vt_pid);
718 nvc->vt_pid = get_pid(task_pid(current));
719 }
Torben Hohnac751ef2011-01-25 15:07:35 -0800720 console_unlock();
Alan Coxd3b5cff2009-09-19 13:13:26 -0700721 if (ret)
722 break;
723 /* Commence switch and lock */
Alan Cox4001d7b2012-03-02 14:59:20 +0000724 /* Review set_console locks */
Jiri Olsad6378372011-02-11 15:39:28 +0100725 set_console(vsa.console);
Alan Coxd3b5cff2009-09-19 13:13:26 -0700726 }
Jiri Olsad6378372011-02-11 15:39:28 +0100727 break;
Alan Coxd3b5cff2009-09-19 13:13:26 -0700728 }
729
Linus Torvalds1da177e2005-04-16 15:20:36 -0700730 /*
731 * wait until the specified VT has been activated
732 */
733 case VT_WAITACTIVE:
734 if (!perm)
Alan Cox4001d7b2012-03-02 14:59:20 +0000735 return -EPERM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700736 if (arg == 0 || arg > MAX_NR_CONSOLES)
Alan Cox9cc3c222008-04-30 00:53:26 -0700737 ret = -ENXIO;
Alan Cox99cceb4e2012-03-02 14:59:49 +0000738 else
Alan Cox8b92e872009-09-19 13:13:24 -0700739 ret = vt_waitactive(arg);
Alan Cox9cc3c222008-04-30 00:53:26 -0700740 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700741
742 /*
743 * If a vt is under process control, the kernel will not switch to it
744 * immediately, but postpone the operation until the process calls this
745 * ioctl, allowing the switch to complete.
746 *
747 * According to the X sources this is the behavior:
748 * 0: pending switch-from not OK
749 * 1: pending switch-from OK
750 * 2: completed switch-to OK
751 */
752 case VT_RELDISP:
753 if (!perm)
Alan Cox4001d7b2012-03-02 14:59:20 +0000754 return -EPERM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700755
Alan Cox4001d7b2012-03-02 14:59:20 +0000756 console_lock();
Alan Cox9cc3c222008-04-30 00:53:26 -0700757 if (vc->vt_mode.mode != VT_PROCESS) {
Alan Cox4001d7b2012-03-02 14:59:20 +0000758 console_unlock();
Alan Cox9cc3c222008-04-30 00:53:26 -0700759 ret = -EINVAL;
760 break;
761 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700762 /*
763 * Switching-from response
764 */
765 if (vc->vt_newvt >= 0) {
766 if (arg == 0)
767 /*
768 * Switch disallowed, so forget we were trying
769 * to do it.
770 */
771 vc->vt_newvt = -1;
772
773 else {
774 /*
775 * The current vt has been released, so
776 * complete the switch.
777 */
778 int newvt;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700779 newvt = vc->vt_newvt;
780 vc->vt_newvt = -1;
Alan Cox9cc3c222008-04-30 00:53:26 -0700781 ret = vc_allocate(newvt);
782 if (ret) {
Torben Hohnac751ef2011-01-25 15:07:35 -0800783 console_unlock();
Alan Cox9cc3c222008-04-30 00:53:26 -0700784 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700785 }
786 /*
787 * When we actually do the console switch,
788 * make sure we are atomic with respect to
789 * other console switches..
790 */
791 complete_change_console(vc_cons[newvt].d);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700792 }
Alan Cox9cc3c222008-04-30 00:53:26 -0700793 } else {
794 /*
795 * Switched-to response
796 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700797 /*
798 * If it's just an ACK, ignore it
799 */
Alan Cox9cc3c222008-04-30 00:53:26 -0700800 if (arg != VT_ACKACQ)
801 ret = -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700802 }
Torben Hohnac751ef2011-01-25 15:07:35 -0800803 console_unlock();
Alan Cox9cc3c222008-04-30 00:53:26 -0700804 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700805
806 /*
807 * Disallocate memory associated to VT (but leave VT1)
808 */
809 case VT_DISALLOCATE:
Alan Cox9cc3c222008-04-30 00:53:26 -0700810 if (arg > MAX_NR_CONSOLES) {
811 ret = -ENXIO;
812 break;
813 }
Peter Hurley421b40a2013-05-17 12:41:03 -0400814 if (arg == 0)
815 vt_disallocate_all();
816 else
817 ret = vt_disallocate(--arg);
Alan Cox9cc3c222008-04-30 00:53:26 -0700818 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700819
820 case VT_RESIZE:
821 {
822 struct vt_sizes __user *vtsizes = up;
Antonino A. Daplase400b6e2007-10-16 01:29:35 -0700823 struct vc_data *vc;
824
Linus Torvalds1da177e2005-04-16 15:20:36 -0700825 ushort ll,cc;
826 if (!perm)
Alan Cox4001d7b2012-03-02 14:59:20 +0000827 return -EPERM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700828 if (get_user(ll, &vtsizes->v_rows) ||
829 get_user(cc, &vtsizes->v_cols))
Alan Cox9cc3c222008-04-30 00:53:26 -0700830 ret = -EFAULT;
831 else {
Torben Hohnac751ef2011-01-25 15:07:35 -0800832 console_lock();
Alan Cox9cc3c222008-04-30 00:53:26 -0700833 for (i = 0; i < MAX_NR_CONSOLES; i++) {
834 vc = vc_cons[i].d;
Antonino A. Daplase400b6e2007-10-16 01:29:35 -0700835
Alan Cox9cc3c222008-04-30 00:53:26 -0700836 if (vc) {
837 vc->vc_resize_user = 1;
Alan Cox4001d7b2012-03-02 14:59:20 +0000838 /* FIXME: review v tty lock */
Alan Cox8c9a9dd2008-08-15 10:39:38 +0100839 vc_resize(vc_cons[i].d, cc, ll);
Alan Cox9cc3c222008-04-30 00:53:26 -0700840 }
Antonino A. Daplase400b6e2007-10-16 01:29:35 -0700841 }
Torben Hohnac751ef2011-01-25 15:07:35 -0800842 console_unlock();
Antonino A. Daplase400b6e2007-10-16 01:29:35 -0700843 }
Alan Cox9cc3c222008-04-30 00:53:26 -0700844 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700845 }
846
847 case VT_RESIZEX:
848 {
849 struct vt_consize __user *vtconsize = up;
850 ushort ll,cc,vlin,clin,vcol,ccol;
851 if (!perm)
Alan Cox4001d7b2012-03-02 14:59:20 +0000852 return -EPERM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700853 if (!access_ok(VERIFY_READ, vtconsize,
Alan Cox9cc3c222008-04-30 00:53:26 -0700854 sizeof(struct vt_consize))) {
855 ret = -EFAULT;
856 break;
857 }
858 /* FIXME: Should check the copies properly */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700859 __get_user(ll, &vtconsize->v_rows);
860 __get_user(cc, &vtconsize->v_cols);
861 __get_user(vlin, &vtconsize->v_vlin);
862 __get_user(clin, &vtconsize->v_clin);
863 __get_user(vcol, &vtconsize->v_vcol);
864 __get_user(ccol, &vtconsize->v_ccol);
865 vlin = vlin ? vlin : vc->vc_scan_lines;
866 if (clin) {
867 if (ll) {
Alan Cox9cc3c222008-04-30 00:53:26 -0700868 if (ll != vlin/clin) {
869 /* Parameters don't add up */
870 ret = -EINVAL;
871 break;
872 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700873 } else
874 ll = vlin/clin;
875 }
876 if (vcol && ccol) {
877 if (cc) {
Alan Cox9cc3c222008-04-30 00:53:26 -0700878 if (cc != vcol/ccol) {
879 ret = -EINVAL;
880 break;
881 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700882 } else
883 cc = vcol/ccol;
884 }
885
Alan Cox9cc3c222008-04-30 00:53:26 -0700886 if (clin > 32) {
887 ret = -EINVAL;
888 break;
889 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700890
891 for (i = 0; i < MAX_NR_CONSOLES; i++) {
892 if (!vc_cons[i].d)
893 continue;
Torben Hohnac751ef2011-01-25 15:07:35 -0800894 console_lock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700895 if (vlin)
896 vc_cons[i].d->vc_scan_lines = vlin;
897 if (clin)
898 vc_cons[i].d->vc_font.height = clin;
Antonino A. Daplase400b6e2007-10-16 01:29:35 -0700899 vc_cons[i].d->vc_resize_user = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700900 vc_resize(vc_cons[i].d, cc, ll);
Torben Hohnac751ef2011-01-25 15:07:35 -0800901 console_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700902 }
Alan Cox9cc3c222008-04-30 00:53:26 -0700903 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700904 }
905
906 case PIO_FONT: {
907 if (!perm)
Alan Cox4001d7b2012-03-02 14:59:20 +0000908 return -EPERM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700909 op.op = KD_FONT_OP_SET;
910 op.flags = KD_FONT_FLAG_OLD | KD_FONT_FLAG_DONT_RECALC; /* Compatibility */
911 op.width = 8;
912 op.height = 0;
913 op.charcount = 256;
914 op.data = up;
Alan Cox9cc3c222008-04-30 00:53:26 -0700915 ret = con_font_op(vc_cons[fg_console].d, &op);
916 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700917 }
918
919 case GIO_FONT: {
920 op.op = KD_FONT_OP_GET;
921 op.flags = KD_FONT_FLAG_OLD;
922 op.width = 8;
923 op.height = 32;
924 op.charcount = 256;
925 op.data = up;
Alan Cox9cc3c222008-04-30 00:53:26 -0700926 ret = con_font_op(vc_cons[fg_console].d, &op);
927 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700928 }
929
930 case PIO_CMAP:
931 if (!perm)
Alan Cox9cc3c222008-04-30 00:53:26 -0700932 ret = -EPERM;
933 else
934 ret = con_set_cmap(up);
935 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700936
937 case GIO_CMAP:
Alan Cox9cc3c222008-04-30 00:53:26 -0700938 ret = con_get_cmap(up);
939 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700940
941 case PIO_FONTX:
942 case GIO_FONTX:
Alan Cox9cc3c222008-04-30 00:53:26 -0700943 ret = do_fontx_ioctl(cmd, up, perm, &op);
944 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700945
946 case PIO_FONTRESET:
947 {
948 if (!perm)
Alan Cox4001d7b2012-03-02 14:59:20 +0000949 return -EPERM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700950
951#ifdef BROKEN_GRAPHICS_PROGRAMS
952 /* With BROKEN_GRAPHICS_PROGRAMS defined, the default
953 font is not saved. */
Alan Cox9cc3c222008-04-30 00:53:26 -0700954 ret = -ENOSYS;
955 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700956#else
957 {
958 op.op = KD_FONT_OP_SET_DEFAULT;
959 op.data = NULL;
Alan Cox9cc3c222008-04-30 00:53:26 -0700960 ret = con_font_op(vc_cons[fg_console].d, &op);
961 if (ret)
962 break;
Alan Cox5d1a33f2012-04-24 11:06:06 +0100963 console_lock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700964 con_set_default_unimap(vc_cons[fg_console].d);
Alan Cox5d1a33f2012-04-24 11:06:06 +0100965 console_unlock();
Alan Cox9cc3c222008-04-30 00:53:26 -0700966 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700967 }
968#endif
969 }
970
971 case KDFONTOP: {
Alan Cox9cc3c222008-04-30 00:53:26 -0700972 if (copy_from_user(&op, up, sizeof(op))) {
973 ret = -EFAULT;
974 break;
975 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700976 if (!perm && op.op != KD_FONT_OP_GET)
Alan Cox4001d7b2012-03-02 14:59:20 +0000977 return -EPERM;
Alan Cox9cc3c222008-04-30 00:53:26 -0700978 ret = con_font_op(vc, &op);
979 if (ret)
980 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700981 if (copy_to_user(up, &op, sizeof(op)))
Alan Cox9cc3c222008-04-30 00:53:26 -0700982 ret = -EFAULT;
983 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700984 }
985
986 case PIO_SCRNMAP:
987 if (!perm)
Alan Cox9cc3c222008-04-30 00:53:26 -0700988 ret = -EPERM;
Alan Cox5d1a33f2012-04-24 11:06:06 +0100989 else
Alan Cox9cc3c222008-04-30 00:53:26 -0700990 ret = con_set_trans_old(up);
991 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700992
993 case GIO_SCRNMAP:
Alan Cox9cc3c222008-04-30 00:53:26 -0700994 ret = con_get_trans_old(up);
995 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700996
997 case PIO_UNISCRNMAP:
998 if (!perm)
Alan Cox9cc3c222008-04-30 00:53:26 -0700999 ret = -EPERM;
Alan Cox5d1a33f2012-04-24 11:06:06 +01001000 else
Alan Cox9cc3c222008-04-30 00:53:26 -07001001 ret = con_set_trans_new(up);
1002 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001003
1004 case GIO_UNISCRNMAP:
Alan Cox9cc3c222008-04-30 00:53:26 -07001005 ret = con_get_trans_new(up);
1006 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001007
1008 case PIO_UNIMAPCLR:
1009 { struct unimapinit ui;
1010 if (!perm)
Alan Cox4001d7b2012-03-02 14:59:20 +00001011 return -EPERM;
Alan Cox9cc3c222008-04-30 00:53:26 -07001012 ret = copy_from_user(&ui, up, sizeof(struct unimapinit));
Dan Carpenter3fde85d2010-06-04 12:20:46 +02001013 if (ret)
1014 ret = -EFAULT;
Alan Cox5d1a33f2012-04-24 11:06:06 +01001015 else
Alan Cox9cc3c222008-04-30 00:53:26 -07001016 con_clear_unimap(vc, &ui);
1017 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001018 }
1019
1020 case PIO_UNIMAP:
1021 case GIO_UNIMAP:
Alan Cox9cc3c222008-04-30 00:53:26 -07001022 ret = do_unimap_ioctl(cmd, up, perm, vc);
1023 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001024
1025 case VT_LOCKSWITCH:
1026 if (!capable(CAP_SYS_TTY_CONFIG))
Alan Cox4001d7b2012-03-02 14:59:20 +00001027 return -EPERM;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001028 vt_dont_switch = 1;
Alan Cox9cc3c222008-04-30 00:53:26 -07001029 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001030 case VT_UNLOCKSWITCH:
1031 if (!capable(CAP_SYS_TTY_CONFIG))
Alan Cox4001d7b2012-03-02 14:59:20 +00001032 return -EPERM;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001033 vt_dont_switch = 0;
Alan Cox9cc3c222008-04-30 00:53:26 -07001034 break;
Samuel Thibault533475d2006-08-27 01:23:39 -07001035 case VT_GETHIFONTMASK:
Alan Cox9cc3c222008-04-30 00:53:26 -07001036 ret = put_user(vc->vc_hi_font_mask,
1037 (unsigned short __user *)arg);
1038 break;
Alan Cox8b92e872009-09-19 13:13:24 -07001039 case VT_WAITEVENT:
1040 ret = vt_event_wait_ioctl((struct vt_event __user *)arg);
1041 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001042 default:
Alan Cox9cc3c222008-04-30 00:53:26 -07001043 ret = -ENOIOCTLCMD;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001044 }
Alan Cox9cc3c222008-04-30 00:53:26 -07001045out:
Alan Cox9cc3c222008-04-30 00:53:26 -07001046 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001047}
1048
Linus Torvalds1da177e2005-04-16 15:20:36 -07001049void reset_vc(struct vc_data *vc)
1050{
1051 vc->vc_mode = KD_TEXT;
Alan Cox079c9532012-02-28 14:49:23 +00001052 vt_reset_unicode(vc->vc_num);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001053 vc->vt_mode.mode = VT_AUTO;
1054 vc->vt_mode.waitv = 0;
1055 vc->vt_mode.relsig = 0;
1056 vc->vt_mode.acqsig = 0;
1057 vc->vt_mode.frsig = 0;
Eric W. Biederman8b6312f2007-02-10 01:44:34 -08001058 put_pid(vc->vt_pid);
1059 vc->vt_pid = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001060 vc->vt_newvt = -1;
1061 if (!in_interrupt()) /* Via keyboard.c:SAK() - akpm */
1062 reset_palette(vc);
1063}
1064
Eric W. Biederman8b6312f2007-02-10 01:44:34 -08001065void vc_SAK(struct work_struct *work)
1066{
1067 struct vc *vc_con =
1068 container_of(work, struct vc, SAK_work);
1069 struct vc_data *vc;
1070 struct tty_struct *tty;
1071
Torben Hohnac751ef2011-01-25 15:07:35 -08001072 console_lock();
Eric W. Biederman8b6312f2007-02-10 01:44:34 -08001073 vc = vc_con->d;
1074 if (vc) {
Alan Cox079c9532012-02-28 14:49:23 +00001075 /* FIXME: review tty ref counting */
Alan Cox8ce73262010-06-01 22:52:56 +02001076 tty = vc->port.tty;
Eric W. Biederman8b6312f2007-02-10 01:44:34 -08001077 /*
1078 * SAK should also work in all raw modes and reset
1079 * them properly.
1080 */
1081 if (tty)
1082 __do_SAK(tty);
1083 reset_vc(vc);
1084 }
Torben Hohnac751ef2011-01-25 15:07:35 -08001085 console_unlock();
Eric W. Biederman8b6312f2007-02-10 01:44:34 -08001086}
1087
Arnd Bergmanne9216652009-08-06 15:09:28 +02001088#ifdef CONFIG_COMPAT
1089
1090struct compat_consolefontdesc {
1091 unsigned short charcount; /* characters in font (256 or 512) */
1092 unsigned short charheight; /* scan lines per character (1-32) */
1093 compat_caddr_t chardata; /* font data in expanded form */
1094};
1095
1096static inline int
1097compat_fontx_ioctl(int cmd, struct compat_consolefontdesc __user *user_cfd,
1098 int perm, struct console_font_op *op)
1099{
1100 struct compat_consolefontdesc cfdarg;
1101 int i;
1102
1103 if (copy_from_user(&cfdarg, user_cfd, sizeof(struct compat_consolefontdesc)))
1104 return -EFAULT;
1105
1106 switch (cmd) {
1107 case PIO_FONTX:
1108 if (!perm)
1109 return -EPERM;
1110 op->op = KD_FONT_OP_SET;
1111 op->flags = KD_FONT_FLAG_OLD;
1112 op->width = 8;
1113 op->height = cfdarg.charheight;
1114 op->charcount = cfdarg.charcount;
1115 op->data = compat_ptr(cfdarg.chardata);
1116 return con_font_op(vc_cons[fg_console].d, op);
1117 case GIO_FONTX:
1118 op->op = KD_FONT_OP_GET;
1119 op->flags = KD_FONT_FLAG_OLD;
1120 op->width = 8;
1121 op->height = cfdarg.charheight;
1122 op->charcount = cfdarg.charcount;
1123 op->data = compat_ptr(cfdarg.chardata);
1124 i = con_font_op(vc_cons[fg_console].d, op);
1125 if (i)
1126 return i;
1127 cfdarg.charheight = op->height;
1128 cfdarg.charcount = op->charcount;
1129 if (copy_to_user(user_cfd, &cfdarg, sizeof(struct compat_consolefontdesc)))
1130 return -EFAULT;
1131 return 0;
1132 }
1133 return -EINVAL;
1134}
1135
1136struct compat_console_font_op {
1137 compat_uint_t op; /* operation code KD_FONT_OP_* */
1138 compat_uint_t flags; /* KD_FONT_FLAG_* */
1139 compat_uint_t width, height; /* font size */
1140 compat_uint_t charcount;
1141 compat_caddr_t data; /* font data with height fixed to 32 */
1142};
1143
1144static inline int
1145compat_kdfontop_ioctl(struct compat_console_font_op __user *fontop,
1146 int perm, struct console_font_op *op, struct vc_data *vc)
1147{
1148 int i;
1149
1150 if (copy_from_user(op, fontop, sizeof(struct compat_console_font_op)))
1151 return -EFAULT;
1152 if (!perm && op->op != KD_FONT_OP_GET)
1153 return -EPERM;
1154 op->data = compat_ptr(((struct compat_console_font_op *)op)->data);
Arnd Bergmanne9216652009-08-06 15:09:28 +02001155 i = con_font_op(vc, op);
1156 if (i)
1157 return i;
1158 ((struct compat_console_font_op *)op)->data = (unsigned long)op->data;
1159 if (copy_to_user(fontop, op, sizeof(struct compat_console_font_op)))
1160 return -EFAULT;
1161 return 0;
1162}
1163
1164struct compat_unimapdesc {
1165 unsigned short entry_ct;
1166 compat_caddr_t entries;
1167};
1168
1169static inline int
1170compat_unimap_ioctl(unsigned int cmd, struct compat_unimapdesc __user *user_ud,
1171 int perm, struct vc_data *vc)
1172{
1173 struct compat_unimapdesc tmp;
1174 struct unipair __user *tmp_entries;
1175
1176 if (copy_from_user(&tmp, user_ud, sizeof tmp))
1177 return -EFAULT;
1178 tmp_entries = compat_ptr(tmp.entries);
1179 if (tmp_entries)
1180 if (!access_ok(VERIFY_WRITE, tmp_entries,
1181 tmp.entry_ct*sizeof(struct unipair)))
1182 return -EFAULT;
1183 switch (cmd) {
1184 case PIO_UNIMAP:
1185 if (!perm)
1186 return -EPERM;
1187 return con_set_unimap(vc, tmp.entry_ct, tmp_entries);
1188 case GIO_UNIMAP:
1189 if (!perm && fg_console != vc->vc_num)
1190 return -EPERM;
1191 return con_get_unimap(vc, tmp.entry_ct, &(user_ud->entry_ct), tmp_entries);
1192 }
1193 return 0;
1194}
1195
Alan Cox6caa76b2011-02-14 16:27:22 +00001196long vt_compat_ioctl(struct tty_struct *tty,
Arnd Bergmanne9216652009-08-06 15:09:28 +02001197 unsigned int cmd, unsigned long arg)
1198{
1199 struct vc_data *vc = tty->driver_data;
1200 struct console_font_op op; /* used in multiple places here */
Arnd Bergmanne9216652009-08-06 15:09:28 +02001201 unsigned int console;
1202 void __user *up = (void __user *)arg;
1203 int perm;
1204 int ret = 0;
1205
1206 console = vc->vc_num;
1207
Arnd Bergmanne9216652009-08-06 15:09:28 +02001208 if (!vc_cons_allocated(console)) { /* impossible? */
1209 ret = -ENOIOCTLCMD;
1210 goto out;
1211 }
1212
1213 /*
1214 * To have permissions to do most of the vt ioctls, we either have
1215 * to be the owner of the tty, or have CAP_SYS_TTY_CONFIG.
1216 */
1217 perm = 0;
1218 if (current->signal->tty == tty || capable(CAP_SYS_TTY_CONFIG))
1219 perm = 1;
1220
Arnd Bergmanne9216652009-08-06 15:09:28 +02001221 switch (cmd) {
1222 /*
1223 * these need special handlers for incompatible data structures
1224 */
1225 case PIO_FONTX:
1226 case GIO_FONTX:
1227 ret = compat_fontx_ioctl(cmd, up, perm, &op);
1228 break;
1229
1230 case KDFONTOP:
1231 ret = compat_kdfontop_ioctl(up, perm, &op, vc);
1232 break;
1233
1234 case PIO_UNIMAP:
1235 case GIO_UNIMAP:
Andreas Schwab4b1fe772009-09-28 20:10:02 +02001236 ret = compat_unimap_ioctl(cmd, up, perm, vc);
Arnd Bergmanne9216652009-08-06 15:09:28 +02001237 break;
1238
1239 /*
1240 * all these treat 'arg' as an integer
1241 */
1242 case KIOCSOUND:
1243 case KDMKTONE:
1244#ifdef CONFIG_X86
1245 case KDADDIO:
1246 case KDDELIO:
1247#endif
1248 case KDSETMODE:
1249 case KDMAPDISP:
1250 case KDUNMAPDISP:
1251 case KDSKBMODE:
1252 case KDSKBMETA:
1253 case KDSKBLED:
1254 case KDSETLED:
1255 case KDSIGACCEPT:
1256 case VT_ACTIVATE:
1257 case VT_WAITACTIVE:
1258 case VT_RELDISP:
1259 case VT_DISALLOCATE:
1260 case VT_RESIZE:
1261 case VT_RESIZEX:
1262 goto fallback;
1263
1264 /*
1265 * the rest has a compatible data structure behind arg,
1266 * but we have to convert it to a proper 64 bit pointer.
1267 */
1268 default:
1269 arg = (unsigned long)compat_ptr(arg);
1270 goto fallback;
1271 }
1272out:
Arnd Bergmanne9216652009-08-06 15:09:28 +02001273 return ret;
1274
1275fallback:
Alan Cox6caa76b2011-02-14 16:27:22 +00001276 return vt_ioctl(tty, cmd, arg);
Arnd Bergmanne9216652009-08-06 15:09:28 +02001277}
1278
1279
1280#endif /* CONFIG_COMPAT */
1281
1282
Linus Torvalds1da177e2005-04-16 15:20:36 -07001283/*
Alan Coxd3b5cff2009-09-19 13:13:26 -07001284 * Performs the back end of a vt switch. Called under the console
1285 * semaphore.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001286 */
1287static void complete_change_console(struct vc_data *vc)
1288{
1289 unsigned char old_vc_mode;
Alan Cox8b92e872009-09-19 13:13:24 -07001290 int old = fg_console;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001291
1292 last_console = fg_console;
1293
1294 /*
1295 * If we're switching, we could be going from KD_GRAPHICS to
1296 * KD_TEXT mode or vice versa, which means we need to blank or
1297 * unblank the screen later.
1298 */
1299 old_vc_mode = vc_cons[fg_console].d->vc_mode;
1300 switch_screen(vc);
1301
1302 /*
Eric W. Biederman3dfcaf162006-12-13 00:34:05 -08001303 * This can't appear below a successful kill_pid(). If it did,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001304 * then the *blank_screen operation could occur while X, having
1305 * received acqsig, is waking up on another processor. This
1306 * condition can lead to overlapping accesses to the VGA range
1307 * and the framebuffer (causing system lockups).
1308 *
1309 * To account for this we duplicate this code below only if the
1310 * controlling process is gone and we've called reset_vc.
1311 */
1312 if (old_vc_mode != vc->vc_mode) {
1313 if (vc->vc_mode == KD_TEXT)
1314 do_unblank_screen(1);
1315 else
1316 do_blank_screen(1);
1317 }
1318
1319 /*
1320 * If this new console is under process control, send it a signal
1321 * telling it that it has acquired. Also check if it has died and
1322 * clean up (similar to logic employed in change_console())
1323 */
Greg Kroah-Hartman87a6aca2010-03-15 17:14:15 -07001324 if (vc->vt_mode.mode == VT_PROCESS) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001325 /*
Eric W. Biederman3dfcaf162006-12-13 00:34:05 -08001326 * Send the signal as privileged - kill_pid() will
Linus Torvalds1da177e2005-04-16 15:20:36 -07001327 * tell us if the process has gone or something else
1328 * is awry
1329 */
Eric W. Biedermanbde0d2c92006-10-02 02:17:14 -07001330 if (kill_pid(vc->vt_pid, vc->vt_mode.acqsig, 1) != 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001331 /*
1332 * The controlling process has died, so we revert back to
1333 * normal operation. In this case, we'll also change back
1334 * to KD_TEXT mode. I'm not sure if this is strictly correct
1335 * but it saves the agony when the X server dies and the screen
1336 * remains blanked due to KD_GRAPHICS! It would be nice to do
1337 * this outside of VT_PROCESS but there is no single process
1338 * to account for and tracking tty count may be undesirable.
1339 */
1340 reset_vc(vc);
1341
1342 if (old_vc_mode != vc->vc_mode) {
1343 if (vc->vc_mode == KD_TEXT)
1344 do_unblank_screen(1);
1345 else
1346 do_blank_screen(1);
1347 }
1348 }
1349 }
1350
1351 /*
1352 * Wake anyone waiting for their VT to activate
1353 */
Alan Cox8b92e872009-09-19 13:13:24 -07001354 vt_event_post(VT_EVENT_SWITCH, old, vc->vc_num);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001355 return;
1356}
1357
1358/*
1359 * Performs the front-end of a vt switch
1360 */
1361void change_console(struct vc_data *new_vc)
1362{
1363 struct vc_data *vc;
1364
1365 if (!new_vc || new_vc->vc_num == fg_console || vt_dont_switch)
1366 return;
1367
1368 /*
1369 * If this vt is in process mode, then we need to handshake with
1370 * that process before switching. Essentially, we store where that
1371 * vt wants to switch to and wait for it to tell us when it's done
1372 * (via VT_RELDISP ioctl).
1373 *
1374 * We also check to see if the controlling process still exists.
1375 * If it doesn't, we reset this vt to auto mode and continue.
1376 * This is a cheap way to track process control. The worst thing
1377 * that can happen is: we send a signal to a process, it dies, and
1378 * the switch gets "lost" waiting for a response; hopefully, the
1379 * user will try again, we'll detect the process is gone (unless
1380 * the user waits just the right amount of time :-) and revert the
1381 * vt to auto control.
1382 */
1383 vc = vc_cons[fg_console].d;
Greg Kroah-Hartman87a6aca2010-03-15 17:14:15 -07001384 if (vc->vt_mode.mode == VT_PROCESS) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001385 /*
Eric W. Biederman3dfcaf162006-12-13 00:34:05 -08001386 * Send the signal as privileged - kill_pid() will
Linus Torvalds1da177e2005-04-16 15:20:36 -07001387 * tell us if the process has gone or something else
Jan Lübbea64314e2007-09-29 18:47:51 +02001388 * is awry.
1389 *
1390 * We need to set vt_newvt *before* sending the signal or we
1391 * have a race.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001392 */
Jan Lübbea64314e2007-09-29 18:47:51 +02001393 vc->vt_newvt = new_vc->vc_num;
Eric W. Biedermanbde0d2c92006-10-02 02:17:14 -07001394 if (kill_pid(vc->vt_pid, vc->vt_mode.relsig, 1) == 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001395 /*
Greg Kroah-Hartman87a6aca2010-03-15 17:14:15 -07001396 * It worked. Mark the vt to switch to and
1397 * return. The process needs to send us a
1398 * VT_RELDISP ioctl to complete the switch.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001399 */
Greg Kroah-Hartman87a6aca2010-03-15 17:14:15 -07001400 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001401 }
1402
1403 /*
Greg Kroah-Hartman87a6aca2010-03-15 17:14:15 -07001404 * The controlling process has died, so we revert back to
1405 * normal operation. In this case, we'll also change back
1406 * to KD_TEXT mode. I'm not sure if this is strictly correct
1407 * but it saves the agony when the X server dies and the screen
1408 * remains blanked due to KD_GRAPHICS! It would be nice to do
1409 * this outside of VT_PROCESS but there is no single process
1410 * to account for and tracking tty count may be undesirable.
1411 */
1412 reset_vc(vc);
1413
1414 /*
1415 * Fall through to normal (VT_AUTO) handling of the switch...
Linus Torvalds1da177e2005-04-16 15:20:36 -07001416 */
1417 }
1418
1419 /*
1420 * Ignore all switches in KD_GRAPHICS+VT_AUTO mode
1421 */
1422 if (vc->vc_mode == KD_GRAPHICS)
1423 return;
1424
1425 complete_change_console(new_vc);
1426}
Alan Cox8d233552009-09-19 13:13:25 -07001427
1428/* Perform a kernel triggered VT switch for suspend/resume */
1429
1430static int disable_vt_switch;
1431
1432int vt_move_to_console(unsigned int vt, int alloc)
1433{
1434 int prev;
1435
Torben Hohnac751ef2011-01-25 15:07:35 -08001436 console_lock();
Alan Cox8d233552009-09-19 13:13:25 -07001437 /* Graphics mode - up to X */
1438 if (disable_vt_switch) {
Torben Hohnac751ef2011-01-25 15:07:35 -08001439 console_unlock();
Alan Cox8d233552009-09-19 13:13:25 -07001440 return 0;
1441 }
1442 prev = fg_console;
1443
1444 if (alloc && vc_allocate(vt)) {
1445 /* we can't have a free VC for now. Too bad,
1446 * we don't want to mess the screen for now. */
Torben Hohnac751ef2011-01-25 15:07:35 -08001447 console_unlock();
Alan Cox8d233552009-09-19 13:13:25 -07001448 return -ENOSPC;
1449 }
1450
1451 if (set_console(vt)) {
1452 /*
1453 * We're unable to switch to the SUSPEND_CONSOLE.
1454 * Let the calling function know so it can decide
1455 * what to do.
1456 */
Torben Hohnac751ef2011-01-25 15:07:35 -08001457 console_unlock();
Alan Cox8d233552009-09-19 13:13:25 -07001458 return -EIO;
1459 }
Torben Hohnac751ef2011-01-25 15:07:35 -08001460 console_unlock();
Jiri Slaby797938b2009-08-11 23:20:41 +02001461 if (vt_waitactive(vt + 1)) {
Alan Cox8d233552009-09-19 13:13:25 -07001462 pr_debug("Suspend: Can't switch VCs.");
1463 return -EINTR;
1464 }
1465 return prev;
1466}
1467
1468/*
1469 * Normally during a suspend, we allocate a new console and switch to it.
1470 * When we resume, we switch back to the original console. This switch
1471 * can be slow, so on systems where the framebuffer can handle restoration
1472 * of video registers anyways, there's little point in doing the console
1473 * switch. This function allows you to disable it by passing it '0'.
1474 */
1475void pm_set_vt_switch(int do_switch)
1476{
Torben Hohnac751ef2011-01-25 15:07:35 -08001477 console_lock();
Alan Cox8d233552009-09-19 13:13:25 -07001478 disable_vt_switch = !do_switch;
Torben Hohnac751ef2011-01-25 15:07:35 -08001479 console_unlock();
Alan Cox8d233552009-09-19 13:13:25 -07001480}
1481EXPORT_SYMBOL(pm_set_vt_switch);