Commit | Line | Data |
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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
1da177e4 | 2 | /* |
1da177e4 LT |
3 | * Copyright (C) 1992 obz under the linux copyright |
4 | * | |
5 | * Dynamic diacritical handling - aeb@cwi.nl - Dec 1993 | |
6 | * Dynamic keymap and string allocation - aeb@cwi.nl - May 1994 | |
7 | * Restrict VT switching via ioctl() - grif@cs.ucr.edu - Dec 1995 | |
8 | * Some code moved for less code duplication - Andi Kleen - Mar 1997 | |
9 | * Check put/get_user, cleanups - acme@conectiva.com.br - Jun 2001 | |
10 | */ | |
11 | ||
1da177e4 LT |
12 | #include <linux/types.h> |
13 | #include <linux/errno.h> | |
3f07c014 | 14 | #include <linux/sched/signal.h> |
1da177e4 LT |
15 | #include <linux/tty.h> |
16 | #include <linux/timer.h> | |
17 | #include <linux/kernel.h> | |
e9216651 | 18 | #include <linux/compat.h> |
8d233558 | 19 | #include <linux/module.h> |
1da177e4 LT |
20 | #include <linux/kd.h> |
21 | #include <linux/vt.h> | |
22 | #include <linux/string.h> | |
23 | #include <linux/slab.h> | |
24 | #include <linux/major.h> | |
25 | #include <linux/fs.h> | |
26 | #include <linux/console.h> | |
04c71976 | 27 | #include <linux/consolemap.h> |
7ed20e1a | 28 | #include <linux/signal.h> |
a5e04b76 | 29 | #include <linux/suspend.h> |
bcc8ca09 | 30 | #include <linux/timex.h> |
1da177e4 LT |
31 | |
32 | #include <asm/io.h> | |
7c0f6ba6 | 33 | #include <linux/uaccess.h> |
1da177e4 | 34 | |
e97267cb GS |
35 | #include <linux/nospec.h> |
36 | ||
1da177e4 LT |
37 | #include <linux/kbd_kern.h> |
38 | #include <linux/vt_kern.h> | |
39 | #include <linux/kbd_diacr.h> | |
40 | #include <linux/selection.h> | |
41 | ||
b257bc05 | 42 | char vt_dont_switch; |
1da177e4 LT |
43 | extern struct tty_driver *console_driver; |
44 | ||
45 | #define VT_IS_IN_USE(i) (console_driver->ttys[i] && console_driver->ttys[i]->count) | |
46 | #define VT_BUSY(i) (VT_IS_IN_USE(i) || i == fg_console || vc_cons[i].d == sel_cons) | |
47 | ||
48 | /* | |
49 | * Console (vt and kd) routines, as defined by USL SVR4 manual, and by | |
50 | * experimentation and study of X386 SYSV handling. | |
51 | * | |
52 | * One point of difference: SYSV vt's are /dev/vtX, which X >= 0, and | |
53 | * /dev/console is a separate ttyp. Under Linux, /dev/tty0 is /dev/console, | |
54 | * and the vc start at /dev/ttyX, X >= 1. We maintain that here, so we will | |
55 | * always treat our set of vt as numbered 1..MAX_NR_CONSOLES (corresponding to | |
56 | * ttys 0..MAX_NR_CONSOLES-1). Explicitly naming VT 0 is illegal, but using | |
57 | * /dev/tty0 (fg_console) as a target is legal, since an implicit aliasing | |
58 | * to the current console is done by the main ioctl code. | |
59 | */ | |
60 | ||
61 | #ifdef CONFIG_X86 | |
66f4e88c | 62 | #include <asm/syscalls.h> |
1da177e4 LT |
63 | #endif |
64 | ||
65 | static void complete_change_console(struct vc_data *vc); | |
66 | ||
8b92e87d AC |
67 | /* |
68 | * User space VT_EVENT handlers | |
69 | */ | |
70 | ||
71 | struct vt_event_wait { | |
72 | struct list_head list; | |
73 | struct vt_event event; | |
74 | int done; | |
75 | }; | |
76 | ||
77 | static LIST_HEAD(vt_events); | |
78 | static DEFINE_SPINLOCK(vt_event_lock); | |
79 | static DECLARE_WAIT_QUEUE_HEAD(vt_event_waitqueue); | |
80 | ||
81 | /** | |
82 | * vt_event_post | |
83 | * @event: the event that occurred | |
84 | * @old: old console | |
85 | * @new: new console | |
86 | * | |
87 | * Post an VT event to interested VT handlers | |
88 | */ | |
89 | ||
90 | void vt_event_post(unsigned int event, unsigned int old, unsigned int new) | |
91 | { | |
92 | struct list_head *pos, *head; | |
93 | unsigned long flags; | |
94 | int wake = 0; | |
95 | ||
96 | spin_lock_irqsave(&vt_event_lock, flags); | |
97 | head = &vt_events; | |
98 | ||
99 | list_for_each(pos, head) { | |
100 | struct vt_event_wait *ve = list_entry(pos, | |
101 | struct vt_event_wait, list); | |
102 | if (!(ve->event.event & event)) | |
103 | continue; | |
104 | ve->event.event = event; | |
105 | /* kernel view is consoles 0..n-1, user space view is | |
106 | console 1..n with 0 meaning current, so we must bias */ | |
308efab5 AC |
107 | ve->event.oldev = old + 1; |
108 | ve->event.newev = new + 1; | |
8b92e87d AC |
109 | wake = 1; |
110 | ve->done = 1; | |
111 | } | |
112 | spin_unlock_irqrestore(&vt_event_lock, flags); | |
113 | if (wake) | |
114 | wake_up_interruptible(&vt_event_waitqueue); | |
115 | } | |
116 | ||
a7b12929 | 117 | static void __vt_event_queue(struct vt_event_wait *vw) |
8b92e87d AC |
118 | { |
119 | unsigned long flags; | |
120 | /* Prepare the event */ | |
121 | INIT_LIST_HEAD(&vw->list); | |
122 | vw->done = 0; | |
123 | /* Queue our event */ | |
124 | spin_lock_irqsave(&vt_event_lock, flags); | |
125 | list_add(&vw->list, &vt_events); | |
126 | spin_unlock_irqrestore(&vt_event_lock, flags); | |
a7b12929 RV |
127 | } |
128 | ||
129 | static void __vt_event_wait(struct vt_event_wait *vw) | |
130 | { | |
8b92e87d | 131 | /* Wait for it to pass */ |
99cceb4e | 132 | wait_event_interruptible(vt_event_waitqueue, vw->done); |
a7b12929 RV |
133 | } |
134 | ||
135 | static void __vt_event_dequeue(struct vt_event_wait *vw) | |
136 | { | |
137 | unsigned long flags; | |
138 | ||
8b92e87d AC |
139 | /* Dequeue it */ |
140 | spin_lock_irqsave(&vt_event_lock, flags); | |
141 | list_del(&vw->list); | |
142 | spin_unlock_irqrestore(&vt_event_lock, flags); | |
143 | } | |
144 | ||
a7b12929 RV |
145 | /** |
146 | * vt_event_wait - wait for an event | |
147 | * @vw: our event | |
148 | * | |
149 | * Waits for an event to occur which completes our vt_event_wait | |
150 | * structure. On return the structure has wv->done set to 1 for success | |
151 | * or 0 if some event such as a signal ended the wait. | |
152 | */ | |
153 | ||
154 | static void vt_event_wait(struct vt_event_wait *vw) | |
155 | { | |
156 | __vt_event_queue(vw); | |
157 | __vt_event_wait(vw); | |
158 | __vt_event_dequeue(vw); | |
159 | } | |
160 | ||
8b92e87d AC |
161 | /** |
162 | * vt_event_wait_ioctl - event ioctl handler | |
163 | * @arg: argument to ioctl | |
164 | * | |
165 | * Implement the VT_WAITEVENT ioctl using the VT event interface | |
166 | */ | |
167 | ||
168 | static int vt_event_wait_ioctl(struct vt_event __user *event) | |
169 | { | |
170 | struct vt_event_wait vw; | |
171 | ||
172 | if (copy_from_user(&vw.event, event, sizeof(struct vt_event))) | |
173 | return -EFAULT; | |
174 | /* Highest supported event for now */ | |
175 | if (vw.event.event & ~VT_MAX_EVENT) | |
176 | return -EINVAL; | |
177 | ||
178 | vt_event_wait(&vw); | |
179 | /* If it occurred report it */ | |
180 | if (vw.done) { | |
181 | if (copy_to_user(event, &vw.event, sizeof(struct vt_event))) | |
182 | return -EFAULT; | |
183 | return 0; | |
184 | } | |
185 | return -EINTR; | |
186 | } | |
187 | ||
188 | /** | |
189 | * vt_waitactive - active console wait | |
190 | * @event: event code | |
191 | * @n: new console | |
192 | * | |
193 | * Helper for event waits. Used to implement the legacy | |
194 | * event waiting ioctls in terms of events | |
195 | */ | |
196 | ||
197 | int vt_waitactive(int n) | |
198 | { | |
199 | struct vt_event_wait vw; | |
200 | do { | |
8b92e87d | 201 | vw.event.event = VT_EVENT_SWITCH; |
a7b12929 RV |
202 | __vt_event_queue(&vw); |
203 | if (n == fg_console + 1) { | |
204 | __vt_event_dequeue(&vw); | |
205 | break; | |
206 | } | |
207 | __vt_event_wait(&vw); | |
208 | __vt_event_dequeue(&vw); | |
8b92e87d AC |
209 | if (vw.done == 0) |
210 | return -EINTR; | |
308efab5 | 211 | } while (vw.event.newev != n); |
8b92e87d AC |
212 | return 0; |
213 | } | |
214 | ||
1da177e4 LT |
215 | /* |
216 | * these are the valid i/o ports we're allowed to change. they map all the | |
217 | * video ports | |
218 | */ | |
219 | #define GPFIRST 0x3b4 | |
220 | #define GPLAST 0x3df | |
221 | #define GPNUM (GPLAST - GPFIRST + 1) | |
222 | ||
1da177e4 | 223 | |
1da177e4 LT |
224 | |
225 | static inline int | |
226 | do_fontx_ioctl(int cmd, struct consolefontdesc __user *user_cfd, int perm, struct console_font_op *op) | |
227 | { | |
228 | struct consolefontdesc cfdarg; | |
229 | int i; | |
230 | ||
231 | if (copy_from_user(&cfdarg, user_cfd, sizeof(struct consolefontdesc))) | |
232 | return -EFAULT; | |
233 | ||
234 | switch (cmd) { | |
235 | case PIO_FONTX: | |
236 | if (!perm) | |
237 | return -EPERM; | |
238 | op->op = KD_FONT_OP_SET; | |
239 | op->flags = KD_FONT_FLAG_OLD; | |
240 | op->width = 8; | |
241 | op->height = cfdarg.charheight; | |
242 | op->charcount = cfdarg.charcount; | |
243 | op->data = cfdarg.chardata; | |
244 | return con_font_op(vc_cons[fg_console].d, op); | |
245 | case GIO_FONTX: { | |
246 | op->op = KD_FONT_OP_GET; | |
247 | op->flags = KD_FONT_FLAG_OLD; | |
248 | op->width = 8; | |
249 | op->height = cfdarg.charheight; | |
250 | op->charcount = cfdarg.charcount; | |
251 | op->data = cfdarg.chardata; | |
252 | i = con_font_op(vc_cons[fg_console].d, op); | |
253 | if (i) | |
254 | return i; | |
255 | cfdarg.charheight = op->height; | |
256 | cfdarg.charcount = op->charcount; | |
257 | if (copy_to_user(user_cfd, &cfdarg, sizeof(struct consolefontdesc))) | |
258 | return -EFAULT; | |
259 | return 0; | |
260 | } | |
261 | } | |
262 | return -EINVAL; | |
263 | } | |
264 | ||
265 | static inline int | |
266 | do_unimap_ioctl(int cmd, struct unimapdesc __user *user_ud, int perm, struct vc_data *vc) | |
267 | { | |
268 | struct unimapdesc tmp; | |
269 | ||
270 | if (copy_from_user(&tmp, user_ud, sizeof tmp)) | |
271 | return -EFAULT; | |
1da177e4 LT |
272 | switch (cmd) { |
273 | case PIO_UNIMAP: | |
274 | if (!perm) | |
275 | return -EPERM; | |
276 | return con_set_unimap(vc, tmp.entry_ct, tmp.entries); | |
277 | case GIO_UNIMAP: | |
278 | if (!perm && fg_console != vc->vc_num) | |
279 | return -EPERM; | |
280 | return con_get_unimap(vc, tmp.entry_ct, &(user_ud->entry_ct), tmp.entries); | |
281 | } | |
282 | return 0; | |
283 | } | |
284 | ||
421b40a6 PH |
285 | /* deallocate a single console, if possible (leave 0) */ |
286 | static int vt_disallocate(unsigned int vc_num) | |
287 | { | |
288 | struct vc_data *vc = NULL; | |
289 | int ret = 0; | |
290 | ||
421b40a6 PH |
291 | console_lock(); |
292 | if (VT_BUSY(vc_num)) | |
293 | ret = -EBUSY; | |
ef223fb3 | 294 | else if (vc_num) |
421b40a6 PH |
295 | vc = vc_deallocate(vc_num); |
296 | console_unlock(); | |
297 | ||
298 | if (vc && vc_num >= MIN_NR_CONSOLES) { | |
299 | tty_port_destroy(&vc->port); | |
300 | kfree(vc); | |
301 | } | |
302 | ||
303 | return ret; | |
304 | } | |
305 | ||
306 | /* deallocate all unused consoles, but leave 0 */ | |
307 | static void vt_disallocate_all(void) | |
308 | { | |
309 | struct vc_data *vc[MAX_NR_CONSOLES]; | |
310 | int i; | |
311 | ||
312 | console_lock(); | |
313 | for (i = 1; i < MAX_NR_CONSOLES; i++) | |
314 | if (!VT_BUSY(i)) | |
315 | vc[i] = vc_deallocate(i); | |
316 | else | |
317 | vc[i] = NULL; | |
318 | console_unlock(); | |
319 | ||
320 | for (i = 1; i < MAX_NR_CONSOLES; i++) { | |
321 | if (vc[i] && i >= MIN_NR_CONSOLES) { | |
322 | tty_port_destroy(&vc[i]->port); | |
323 | kfree(vc[i]); | |
324 | } | |
325 | } | |
326 | } | |
8b92e87d AC |
327 | |
328 | ||
1da177e4 LT |
329 | /* |
330 | * We handle the console-specific ioctl's here. We allow the | |
331 | * capability to modify any console, not just the fg_console. | |
332 | */ | |
6caa76b7 | 333 | int vt_ioctl(struct tty_struct *tty, |
1da177e4 LT |
334 | unsigned int cmd, unsigned long arg) |
335 | { | |
c9f19e96 | 336 | struct vc_data *vc = tty->driver_data; |
1da177e4 | 337 | struct console_font_op op; /* used in multiple places here */ |
1da177e4 LT |
338 | unsigned int console; |
339 | unsigned char ucval; | |
1e0ad288 | 340 | unsigned int uival; |
1da177e4 LT |
341 | void __user *up = (void __user *)arg; |
342 | int i, perm; | |
9cc3c22b AC |
343 | int ret = 0; |
344 | ||
1da177e4 LT |
345 | console = vc->vc_num; |
346 | ||
9cc3c22b AC |
347 | |
348 | if (!vc_cons_allocated(console)) { /* impossible? */ | |
349 | ret = -ENOIOCTLCMD; | |
350 | goto out; | |
351 | } | |
352 | ||
1da177e4 LT |
353 | |
354 | /* | |
355 | * To have permissions to do most of the vt ioctls, we either have | |
356 | * to be the owner of the tty, or have CAP_SYS_TTY_CONFIG. | |
357 | */ | |
358 | perm = 0; | |
359 | if (current->signal->tty == tty || capable(CAP_SYS_TTY_CONFIG)) | |
360 | perm = 1; | |
361 | ||
1da177e4 | 362 | switch (cmd) { |
e6885107 | 363 | case TIOCLINUX: |
a115902f JS |
364 | ret = tioclinux(tty, arg); |
365 | break; | |
1da177e4 LT |
366 | case KIOCSOUND: |
367 | if (!perm) | |
4001d7b7 | 368 | return -EPERM; |
2c4e9671 AB |
369 | /* |
370 | * The use of PIT_TICK_RATE is historic, it used to be | |
371 | * the platform-dependent CLOCK_TICK_RATE between 2.6.12 | |
372 | * and 2.6.36, which was a minor but unfortunate ABI | |
4001d7b7 | 373 | * change. kd_mksound is locked by the input layer. |
2c4e9671 | 374 | */ |
1da177e4 | 375 | if (arg) |
2c4e9671 | 376 | arg = PIT_TICK_RATE / arg; |
1da177e4 | 377 | kd_mksound(arg, 0); |
9cc3c22b | 378 | break; |
1da177e4 LT |
379 | |
380 | case KDMKTONE: | |
381 | if (!perm) | |
4001d7b7 | 382 | return -EPERM; |
1da177e4 LT |
383 | { |
384 | unsigned int ticks, count; | |
385 | ||
386 | /* | |
387 | * Generate the tone for the appropriate number of ticks. | |
388 | * If the time is zero, turn off sound ourselves. | |
389 | */ | |
4c0d9b17 | 390 | ticks = msecs_to_jiffies((arg >> 16) & 0xffff); |
1da177e4 LT |
391 | count = ticks ? (arg & 0xffff) : 0; |
392 | if (count) | |
2c4e9671 | 393 | count = PIT_TICK_RATE / count; |
1da177e4 | 394 | kd_mksound(count, ticks); |
9cc3c22b | 395 | break; |
1da177e4 LT |
396 | } |
397 | ||
398 | case KDGKBTYPE: | |
399 | /* | |
4001d7b7 | 400 | * this is naïve. |
1da177e4 LT |
401 | */ |
402 | ucval = KB_101; | |
079c9534 AC |
403 | ret = put_user(ucval, (char __user *)arg); |
404 | break; | |
1da177e4 LT |
405 | |
406 | /* | |
407 | * These cannot be implemented on any machine that implements | |
408 | * ioperm() in user level (such as Alpha PCs) or not at all. | |
409 | * | |
410 | * XXX: you should never use these, just call ioperm directly.. | |
411 | */ | |
412 | #ifdef CONFIG_X86 | |
413 | case KDADDIO: | |
414 | case KDDELIO: | |
415 | /* | |
416 | * KDADDIO and KDDELIO may be able to add ports beyond what | |
417 | * we reject here, but to be safe... | |
4001d7b7 AC |
418 | * |
419 | * These are locked internally via sys_ioperm | |
1da177e4 | 420 | */ |
9cc3c22b AC |
421 | if (arg < GPFIRST || arg > GPLAST) { |
422 | ret = -EINVAL; | |
423 | break; | |
424 | } | |
66f4e88c | 425 | ret = ksys_ioperm(arg, 1, (cmd == KDADDIO)) ? -ENXIO : 0; |
9cc3c22b | 426 | break; |
1da177e4 LT |
427 | |
428 | case KDENABIO: | |
429 | case KDDISABIO: | |
66f4e88c | 430 | ret = ksys_ioperm(GPFIRST, GPNUM, |
1da177e4 | 431 | (cmd == KDENABIO)) ? -ENXIO : 0; |
9cc3c22b | 432 | break; |
1da177e4 LT |
433 | #endif |
434 | ||
435 | /* Linux m68k/i386 interface for setting the keyboard delay/repeat rate */ | |
436 | ||
437 | case KDKBDREP: | |
438 | { | |
439 | struct kbd_repeat kbrep; | |
1da177e4 LT |
440 | |
441 | if (!capable(CAP_SYS_TTY_CONFIG)) | |
4001d7b7 | 442 | return -EPERM; |
1da177e4 | 443 | |
9cc3c22b AC |
444 | if (copy_from_user(&kbrep, up, sizeof(struct kbd_repeat))) { |
445 | ret = -EFAULT; | |
446 | break; | |
447 | } | |
448 | ret = kbd_rate(&kbrep); | |
449 | if (ret) | |
450 | break; | |
1da177e4 | 451 | if (copy_to_user(up, &kbrep, sizeof(struct kbd_repeat))) |
9cc3c22b AC |
452 | ret = -EFAULT; |
453 | break; | |
1da177e4 LT |
454 | } |
455 | ||
456 | case KDSETMODE: | |
457 | /* | |
458 | * currently, setting the mode from KD_TEXT to KD_GRAPHICS | |
459 | * doesn't do a whole lot. i'm not sure if it should do any | |
460 | * restoration of modes or what... | |
461 | * | |
462 | * XXX It should at least call into the driver, fbdev's definitely | |
463 | * need to restore their engine state. --BenH | |
464 | */ | |
465 | if (!perm) | |
4001d7b7 | 466 | return -EPERM; |
1da177e4 LT |
467 | switch (arg) { |
468 | case KD_GRAPHICS: | |
469 | break; | |
470 | case KD_TEXT0: | |
471 | case KD_TEXT1: | |
472 | arg = KD_TEXT; | |
473 | case KD_TEXT: | |
474 | break; | |
475 | default: | |
9cc3c22b AC |
476 | ret = -EINVAL; |
477 | goto out; | |
1da177e4 | 478 | } |
4001d7b7 | 479 | /* FIXME: this needs the console lock extending */ |
1da177e4 | 480 | if (vc->vc_mode == (unsigned char) arg) |
9cc3c22b | 481 | break; |
1da177e4 LT |
482 | vc->vc_mode = (unsigned char) arg; |
483 | if (console != fg_console) | |
9cc3c22b | 484 | break; |
1da177e4 LT |
485 | /* |
486 | * explicitly blank/unblank the screen if switching modes | |
487 | */ | |
ac751efa | 488 | console_lock(); |
1da177e4 LT |
489 | if (arg == KD_TEXT) |
490 | do_unblank_screen(1); | |
491 | else | |
492 | do_blank_screen(1); | |
ac751efa | 493 | console_unlock(); |
9cc3c22b | 494 | break; |
1da177e4 LT |
495 | |
496 | case KDGETMODE: | |
1e0ad288 | 497 | uival = vc->vc_mode; |
1da177e4 LT |
498 | goto setint; |
499 | ||
500 | case KDMAPDISP: | |
501 | case KDUNMAPDISP: | |
502 | /* | |
503 | * these work like a combination of mmap and KDENABIO. | |
504 | * this could be easily finished. | |
505 | */ | |
9cc3c22b AC |
506 | ret = -EINVAL; |
507 | break; | |
1da177e4 LT |
508 | |
509 | case KDSKBMODE: | |
510 | if (!perm) | |
4001d7b7 | 511 | return -EPERM; |
079c9534 AC |
512 | ret = vt_do_kdskbmode(console, arg); |
513 | if (ret == 0) | |
514 | tty_ldisc_flush(tty); | |
9cc3c22b | 515 | break; |
1da177e4 LT |
516 | |
517 | case KDGKBMODE: | |
079c9534 AC |
518 | uival = vt_do_kdgkbmode(console); |
519 | ret = put_user(uival, (int __user *)arg); | |
520 | break; | |
1da177e4 LT |
521 | |
522 | /* this could be folded into KDSKBMODE, but for compatibility | |
523 | reasons it is not so easy to fold KDGKBMETA into KDGKBMODE */ | |
524 | case KDSKBMETA: | |
079c9534 | 525 | ret = vt_do_kdskbmeta(console, arg); |
9cc3c22b | 526 | break; |
1da177e4 LT |
527 | |
528 | case KDGKBMETA: | |
079c9534 AC |
529 | /* FIXME: should review whether this is worth locking */ |
530 | uival = vt_do_kdgkbmeta(console); | |
1da177e4 | 531 | setint: |
1e0ad288 | 532 | ret = put_user(uival, (int __user *)arg); |
9cc3c22b | 533 | break; |
1da177e4 LT |
534 | |
535 | case KDGETKEYCODE: | |
536 | case KDSETKEYCODE: | |
537 | if(!capable(CAP_SYS_TTY_CONFIG)) | |
9cc3c22b | 538 | perm = 0; |
079c9534 | 539 | ret = vt_do_kbkeycode_ioctl(cmd, up, perm); |
9cc3c22b | 540 | break; |
1da177e4 LT |
541 | |
542 | case KDGKBENT: | |
543 | case KDSKBENT: | |
079c9534 | 544 | ret = vt_do_kdsk_ioctl(cmd, up, perm, console); |
9cc3c22b | 545 | break; |
1da177e4 LT |
546 | |
547 | case KDGKBSENT: | |
548 | case KDSKBSENT: | |
079c9534 | 549 | ret = vt_do_kdgkb_ioctl(cmd, up, perm); |
9cc3c22b | 550 | break; |
1da177e4 | 551 | |
247ff8e6 AC |
552 | /* Diacritical processing. Handled in keyboard.c as it has |
553 | to operate on the keyboard locks and structures */ | |
1da177e4 | 554 | case KDGKBDIACR: |
04c71976 | 555 | case KDGKBDIACRUC: |
1da177e4 | 556 | case KDSKBDIACR: |
04c71976 | 557 | case KDSKBDIACRUC: |
247ff8e6 | 558 | ret = vt_do_diacrit(cmd, up, perm); |
9cc3c22b | 559 | break; |
1da177e4 LT |
560 | |
561 | /* the ioctls below read/set the flags usually shown in the leds */ | |
562 | /* don't use them - they will go away without warning */ | |
563 | case KDGKBLED: | |
1da177e4 | 564 | case KDSKBLED: |
1da177e4 | 565 | case KDGETLED: |
1da177e4 | 566 | case KDSETLED: |
079c9534 | 567 | ret = vt_do_kdskled(console, cmd, arg, perm); |
9cc3c22b | 568 | break; |
1da177e4 LT |
569 | |
570 | /* | |
571 | * A process can indicate its willingness to accept signals | |
572 | * generated by pressing an appropriate key combination. | |
573 | * Thus, one can have a daemon that e.g. spawns a new console | |
574 | * upon a keypress and then changes to it. | |
575 | * See also the kbrequest field of inittab(5). | |
576 | */ | |
577 | case KDSIGACCEPT: | |
578 | { | |
1da177e4 | 579 | if (!perm || !capable(CAP_KILL)) |
4001d7b7 | 580 | return -EPERM; |
7ed20e1a | 581 | if (!valid_signal(arg) || arg < 1 || arg == SIGKILL) |
9cc3c22b AC |
582 | ret = -EINVAL; |
583 | else { | |
584 | spin_lock_irq(&vt_spawn_con.lock); | |
585 | put_pid(vt_spawn_con.pid); | |
586 | vt_spawn_con.pid = get_pid(task_pid(current)); | |
587 | vt_spawn_con.sig = arg; | |
588 | spin_unlock_irq(&vt_spawn_con.lock); | |
589 | } | |
590 | break; | |
1da177e4 LT |
591 | } |
592 | ||
593 | case VT_SETMODE: | |
594 | { | |
595 | struct vt_mode tmp; | |
596 | ||
597 | if (!perm) | |
4001d7b7 | 598 | return -EPERM; |
9cc3c22b AC |
599 | if (copy_from_user(&tmp, up, sizeof(struct vt_mode))) { |
600 | ret = -EFAULT; | |
601 | goto out; | |
602 | } | |
87a6aca5 | 603 | if (tmp.mode != VT_AUTO && tmp.mode != VT_PROCESS) { |
9cc3c22b AC |
604 | ret = -EINVAL; |
605 | goto out; | |
606 | } | |
ac751efa | 607 | console_lock(); |
1da177e4 LT |
608 | vc->vt_mode = tmp; |
609 | /* the frsig is ignored, so we set it to 0 */ | |
610 | vc->vt_mode.frsig = 0; | |
8b6312f4 EB |
611 | put_pid(vc->vt_pid); |
612 | vc->vt_pid = get_pid(task_pid(current)); | |
1da177e4 LT |
613 | /* no switch is required -- saw@shade.msu.ru */ |
614 | vc->vt_newvt = -1; | |
ac751efa | 615 | console_unlock(); |
9cc3c22b | 616 | break; |
1da177e4 LT |
617 | } |
618 | ||
619 | case VT_GETMODE: | |
620 | { | |
621 | struct vt_mode tmp; | |
622 | int rc; | |
623 | ||
ac751efa | 624 | console_lock(); |
1da177e4 | 625 | memcpy(&tmp, &vc->vt_mode, sizeof(struct vt_mode)); |
ac751efa | 626 | console_unlock(); |
1da177e4 LT |
627 | |
628 | rc = copy_to_user(up, &tmp, sizeof(struct vt_mode)); | |
9cc3c22b AC |
629 | if (rc) |
630 | ret = -EFAULT; | |
631 | break; | |
1da177e4 LT |
632 | } |
633 | ||
634 | /* | |
635 | * Returns global vt state. Note that VT 0 is always open, since | |
636 | * it's an alias for the current VT, and people can't use it here. | |
637 | * We cannot return state for more than 16 VTs, since v_state is short. | |
638 | */ | |
639 | case VT_GETSTATE: | |
640 | { | |
641 | struct vt_stat __user *vtstat = up; | |
642 | unsigned short state, mask; | |
643 | ||
4001d7b7 | 644 | /* Review: FIXME: Console lock ? */ |
1da177e4 | 645 | if (put_user(fg_console + 1, &vtstat->v_active)) |
9cc3c22b AC |
646 | ret = -EFAULT; |
647 | else { | |
648 | state = 1; /* /dev/tty0 is always open */ | |
649 | for (i = 0, mask = 2; i < MAX_NR_CONSOLES && mask; | |
650 | ++i, mask <<= 1) | |
651 | if (VT_IS_IN_USE(i)) | |
652 | state |= mask; | |
653 | ret = put_user(state, &vtstat->v_state); | |
654 | } | |
655 | break; | |
1da177e4 LT |
656 | } |
657 | ||
658 | /* | |
659 | * Returns the first available (non-opened) console. | |
660 | */ | |
661 | case VT_OPENQRY: | |
4001d7b7 | 662 | /* FIXME: locking ? - but then this is a stupid API */ |
1da177e4 LT |
663 | for (i = 0; i < MAX_NR_CONSOLES; ++i) |
664 | if (! VT_IS_IN_USE(i)) | |
665 | break; | |
1e0ad288 | 666 | uival = i < MAX_NR_CONSOLES ? (i+1) : -1; |
1da177e4 LT |
667 | goto setint; |
668 | ||
669 | /* | |
670 | * ioctl(fd, VT_ACTIVATE, num) will cause us to switch to vt # num, | |
671 | * with num >= 1 (switches to vt 0, our console, are not allowed, just | |
672 | * to preserve sanity). | |
673 | */ | |
674 | case VT_ACTIVATE: | |
675 | if (!perm) | |
4001d7b7 | 676 | return -EPERM; |
1da177e4 | 677 | if (arg == 0 || arg > MAX_NR_CONSOLES) |
9cc3c22b AC |
678 | ret = -ENXIO; |
679 | else { | |
680 | arg--; | |
ac751efa | 681 | console_lock(); |
9cc3c22b | 682 | ret = vc_allocate(arg); |
ac751efa | 683 | console_unlock(); |
9cc3c22b AC |
684 | if (ret) |
685 | break; | |
686 | set_console(arg); | |
687 | } | |
688 | break; | |
1da177e4 | 689 | |
d3b5cffc AC |
690 | case VT_SETACTIVATE: |
691 | { | |
692 | struct vt_setactivate vsa; | |
693 | ||
694 | if (!perm) | |
4001d7b7 | 695 | return -EPERM; |
d3b5cffc AC |
696 | |
697 | if (copy_from_user(&vsa, (struct vt_setactivate __user *)arg, | |
a09efb07 JS |
698 | sizeof(struct vt_setactivate))) { |
699 | ret = -EFAULT; | |
700 | goto out; | |
701 | } | |
d3b5cffc AC |
702 | if (vsa.console == 0 || vsa.console > MAX_NR_CONSOLES) |
703 | ret = -ENXIO; | |
704 | else { | |
e97267cb GS |
705 | vsa.console = array_index_nospec(vsa.console, |
706 | MAX_NR_CONSOLES + 1); | |
d3b5cffc | 707 | vsa.console--; |
ac751efa | 708 | console_lock(); |
d3b5cffc AC |
709 | ret = vc_allocate(vsa.console); |
710 | if (ret == 0) { | |
711 | struct vc_data *nvc; | |
712 | /* This is safe providing we don't drop the | |
713 | console sem between vc_allocate and | |
714 | finishing referencing nvc */ | |
715 | nvc = vc_cons[vsa.console].d; | |
716 | nvc->vt_mode = vsa.mode; | |
717 | nvc->vt_mode.frsig = 0; | |
718 | put_pid(nvc->vt_pid); | |
719 | nvc->vt_pid = get_pid(task_pid(current)); | |
720 | } | |
ac751efa | 721 | console_unlock(); |
d3b5cffc AC |
722 | if (ret) |
723 | break; | |
724 | /* Commence switch and lock */ | |
4001d7b7 | 725 | /* Review set_console locks */ |
d6378375 | 726 | set_console(vsa.console); |
d3b5cffc | 727 | } |
d6378375 | 728 | break; |
d3b5cffc AC |
729 | } |
730 | ||
1da177e4 LT |
731 | /* |
732 | * wait until the specified VT has been activated | |
733 | */ | |
734 | case VT_WAITACTIVE: | |
735 | if (!perm) | |
4001d7b7 | 736 | return -EPERM; |
1da177e4 | 737 | if (arg == 0 || arg > MAX_NR_CONSOLES) |
9cc3c22b | 738 | ret = -ENXIO; |
99cceb4e | 739 | else |
8b92e87d | 740 | ret = vt_waitactive(arg); |
9cc3c22b | 741 | break; |
1da177e4 LT |
742 | |
743 | /* | |
744 | * If a vt is under process control, the kernel will not switch to it | |
745 | * immediately, but postpone the operation until the process calls this | |
746 | * ioctl, allowing the switch to complete. | |
747 | * | |
748 | * According to the X sources this is the behavior: | |
749 | * 0: pending switch-from not OK | |
750 | * 1: pending switch-from OK | |
751 | * 2: completed switch-to OK | |
752 | */ | |
753 | case VT_RELDISP: | |
754 | if (!perm) | |
4001d7b7 | 755 | return -EPERM; |
1da177e4 | 756 | |
4001d7b7 | 757 | console_lock(); |
9cc3c22b | 758 | if (vc->vt_mode.mode != VT_PROCESS) { |
4001d7b7 | 759 | console_unlock(); |
9cc3c22b AC |
760 | ret = -EINVAL; |
761 | break; | |
762 | } | |
1da177e4 LT |
763 | /* |
764 | * Switching-from response | |
765 | */ | |
766 | if (vc->vt_newvt >= 0) { | |
767 | if (arg == 0) | |
768 | /* | |
769 | * Switch disallowed, so forget we were trying | |
770 | * to do it. | |
771 | */ | |
772 | vc->vt_newvt = -1; | |
773 | ||
774 | else { | |
775 | /* | |
776 | * The current vt has been released, so | |
777 | * complete the switch. | |
778 | */ | |
779 | int newvt; | |
1da177e4 LT |
780 | newvt = vc->vt_newvt; |
781 | vc->vt_newvt = -1; | |
9cc3c22b AC |
782 | ret = vc_allocate(newvt); |
783 | if (ret) { | |
ac751efa | 784 | console_unlock(); |
9cc3c22b | 785 | break; |
1da177e4 LT |
786 | } |
787 | /* | |
788 | * When we actually do the console switch, | |
789 | * make sure we are atomic with respect to | |
790 | * other console switches.. | |
791 | */ | |
792 | complete_change_console(vc_cons[newvt].d); | |
1da177e4 | 793 | } |
9cc3c22b AC |
794 | } else { |
795 | /* | |
796 | * Switched-to response | |
797 | */ | |
1da177e4 LT |
798 | /* |
799 | * If it's just an ACK, ignore it | |
800 | */ | |
9cc3c22b AC |
801 | if (arg != VT_ACKACQ) |
802 | ret = -EINVAL; | |
1da177e4 | 803 | } |
ac751efa | 804 | console_unlock(); |
9cc3c22b | 805 | break; |
1da177e4 LT |
806 | |
807 | /* | |
808 | * Disallocate memory associated to VT (but leave VT1) | |
809 | */ | |
810 | case VT_DISALLOCATE: | |
9cc3c22b AC |
811 | if (arg > MAX_NR_CONSOLES) { |
812 | ret = -ENXIO; | |
813 | break; | |
814 | } | |
421b40a6 PH |
815 | if (arg == 0) |
816 | vt_disallocate_all(); | |
817 | else | |
818 | ret = vt_disallocate(--arg); | |
9cc3c22b | 819 | break; |
1da177e4 LT |
820 | |
821 | case VT_RESIZE: | |
822 | { | |
823 | struct vt_sizes __user *vtsizes = up; | |
e400b6ec AD |
824 | struct vc_data *vc; |
825 | ||
1da177e4 LT |
826 | ushort ll,cc; |
827 | if (!perm) | |
4001d7b7 | 828 | return -EPERM; |
1da177e4 LT |
829 | if (get_user(ll, &vtsizes->v_rows) || |
830 | get_user(cc, &vtsizes->v_cols)) | |
9cc3c22b AC |
831 | ret = -EFAULT; |
832 | else { | |
ac751efa | 833 | console_lock(); |
9cc3c22b AC |
834 | for (i = 0; i < MAX_NR_CONSOLES; i++) { |
835 | vc = vc_cons[i].d; | |
e400b6ec | 836 | |
9cc3c22b AC |
837 | if (vc) { |
838 | vc->vc_resize_user = 1; | |
4001d7b7 | 839 | /* FIXME: review v tty lock */ |
8c9a9dd0 | 840 | vc_resize(vc_cons[i].d, cc, ll); |
9cc3c22b | 841 | } |
e400b6ec | 842 | } |
ac751efa | 843 | console_unlock(); |
e400b6ec | 844 | } |
9cc3c22b | 845 | break; |
1da177e4 LT |
846 | } |
847 | ||
848 | case VT_RESIZEX: | |
849 | { | |
1b3bce4d | 850 | struct vt_consize v; |
1da177e4 | 851 | if (!perm) |
4001d7b7 | 852 | return -EPERM; |
1b3bce4d AV |
853 | if (copy_from_user(&v, up, sizeof(struct vt_consize))) |
854 | return -EFAULT; | |
9cc3c22b | 855 | /* FIXME: Should check the copies properly */ |
1b3bce4d AV |
856 | if (!v.v_vlin) |
857 | v.v_vlin = vc->vc_scan_lines; | |
858 | if (v.v_clin) { | |
859 | int rows = v.v_vlin/v.v_clin; | |
860 | if (v.v_rows != rows) { | |
861 | if (v.v_rows) /* Parameters don't add up */ | |
862 | return -EINVAL; | |
863 | v.v_rows = rows; | |
864 | } | |
1da177e4 | 865 | } |
1b3bce4d AV |
866 | if (v.v_vcol && v.v_ccol) { |
867 | int cols = v.v_vcol/v.v_ccol; | |
868 | if (v.v_cols != cols) { | |
869 | if (v.v_cols) | |
870 | return -EINVAL; | |
871 | v.v_cols = cols; | |
872 | } | |
1da177e4 LT |
873 | } |
874 | ||
1b3bce4d AV |
875 | if (v.v_clin > 32) |
876 | return -EINVAL; | |
877 | ||
1da177e4 LT |
878 | for (i = 0; i < MAX_NR_CONSOLES; i++) { |
879 | if (!vc_cons[i].d) | |
880 | continue; | |
ac751efa | 881 | console_lock(); |
1b3bce4d AV |
882 | if (v.v_vlin) |
883 | vc_cons[i].d->vc_scan_lines = v.v_vlin; | |
884 | if (v.v_clin) | |
885 | vc_cons[i].d->vc_font.height = v.v_clin; | |
e400b6ec | 886 | vc_cons[i].d->vc_resize_user = 1; |
1b3bce4d | 887 | vc_resize(vc_cons[i].d, v.v_cols, v.v_rows); |
ac751efa | 888 | console_unlock(); |
1da177e4 | 889 | } |
9cc3c22b | 890 | break; |
1da177e4 LT |
891 | } |
892 | ||
893 | case PIO_FONT: { | |
894 | if (!perm) | |
4001d7b7 | 895 | return -EPERM; |
1da177e4 LT |
896 | op.op = KD_FONT_OP_SET; |
897 | op.flags = KD_FONT_FLAG_OLD | KD_FONT_FLAG_DONT_RECALC; /* Compatibility */ | |
898 | op.width = 8; | |
899 | op.height = 0; | |
900 | op.charcount = 256; | |
901 | op.data = up; | |
9cc3c22b AC |
902 | ret = con_font_op(vc_cons[fg_console].d, &op); |
903 | break; | |
1da177e4 LT |
904 | } |
905 | ||
906 | case GIO_FONT: { | |
907 | op.op = KD_FONT_OP_GET; | |
908 | op.flags = KD_FONT_FLAG_OLD; | |
909 | op.width = 8; | |
910 | op.height = 32; | |
911 | op.charcount = 256; | |
912 | op.data = up; | |
9cc3c22b AC |
913 | ret = con_font_op(vc_cons[fg_console].d, &op); |
914 | break; | |
1da177e4 LT |
915 | } |
916 | ||
917 | case PIO_CMAP: | |
918 | if (!perm) | |
9cc3c22b AC |
919 | ret = -EPERM; |
920 | else | |
921 | ret = con_set_cmap(up); | |
922 | break; | |
1da177e4 LT |
923 | |
924 | case GIO_CMAP: | |
9cc3c22b AC |
925 | ret = con_get_cmap(up); |
926 | break; | |
1da177e4 LT |
927 | |
928 | case PIO_FONTX: | |
929 | case GIO_FONTX: | |
9cc3c22b AC |
930 | ret = do_fontx_ioctl(cmd, up, perm, &op); |
931 | break; | |
1da177e4 LT |
932 | |
933 | case PIO_FONTRESET: | |
934 | { | |
935 | if (!perm) | |
4001d7b7 | 936 | return -EPERM; |
1da177e4 LT |
937 | |
938 | #ifdef BROKEN_GRAPHICS_PROGRAMS | |
939 | /* With BROKEN_GRAPHICS_PROGRAMS defined, the default | |
940 | font is not saved. */ | |
9cc3c22b AC |
941 | ret = -ENOSYS; |
942 | break; | |
1da177e4 LT |
943 | #else |
944 | { | |
945 | op.op = KD_FONT_OP_SET_DEFAULT; | |
946 | op.data = NULL; | |
9cc3c22b AC |
947 | ret = con_font_op(vc_cons[fg_console].d, &op); |
948 | if (ret) | |
949 | break; | |
5d1a33fa | 950 | console_lock(); |
1da177e4 | 951 | con_set_default_unimap(vc_cons[fg_console].d); |
5d1a33fa | 952 | console_unlock(); |
9cc3c22b | 953 | break; |
1da177e4 LT |
954 | } |
955 | #endif | |
956 | } | |
957 | ||
958 | case KDFONTOP: { | |
9cc3c22b AC |
959 | if (copy_from_user(&op, up, sizeof(op))) { |
960 | ret = -EFAULT; | |
961 | break; | |
962 | } | |
1da177e4 | 963 | if (!perm && op.op != KD_FONT_OP_GET) |
4001d7b7 | 964 | return -EPERM; |
9cc3c22b AC |
965 | ret = con_font_op(vc, &op); |
966 | if (ret) | |
967 | break; | |
1da177e4 | 968 | if (copy_to_user(up, &op, sizeof(op))) |
9cc3c22b AC |
969 | ret = -EFAULT; |
970 | break; | |
1da177e4 LT |
971 | } |
972 | ||
973 | case PIO_SCRNMAP: | |
974 | if (!perm) | |
9cc3c22b | 975 | ret = -EPERM; |
5d1a33fa | 976 | else |
9cc3c22b AC |
977 | ret = con_set_trans_old(up); |
978 | break; | |
1da177e4 LT |
979 | |
980 | case GIO_SCRNMAP: | |
9cc3c22b AC |
981 | ret = con_get_trans_old(up); |
982 | break; | |
1da177e4 LT |
983 | |
984 | case PIO_UNISCRNMAP: | |
985 | if (!perm) | |
9cc3c22b | 986 | ret = -EPERM; |
5d1a33fa | 987 | else |
9cc3c22b AC |
988 | ret = con_set_trans_new(up); |
989 | break; | |
1da177e4 LT |
990 | |
991 | case GIO_UNISCRNMAP: | |
9cc3c22b AC |
992 | ret = con_get_trans_new(up); |
993 | break; | |
1da177e4 LT |
994 | |
995 | case PIO_UNIMAPCLR: | |
1da177e4 | 996 | if (!perm) |
4001d7b7 | 997 | return -EPERM; |
f8b0c2e6 | 998 | con_clear_unimap(vc); |
9cc3c22b | 999 | break; |
1da177e4 LT |
1000 | |
1001 | case PIO_UNIMAP: | |
1002 | case GIO_UNIMAP: | |
9cc3c22b AC |
1003 | ret = do_unimap_ioctl(cmd, up, perm, vc); |
1004 | break; | |
1da177e4 LT |
1005 | |
1006 | case VT_LOCKSWITCH: | |
1007 | if (!capable(CAP_SYS_TTY_CONFIG)) | |
4001d7b7 | 1008 | return -EPERM; |
1da177e4 | 1009 | vt_dont_switch = 1; |
9cc3c22b | 1010 | break; |
1da177e4 LT |
1011 | case VT_UNLOCKSWITCH: |
1012 | if (!capable(CAP_SYS_TTY_CONFIG)) | |
4001d7b7 | 1013 | return -EPERM; |
1da177e4 | 1014 | vt_dont_switch = 0; |
9cc3c22b | 1015 | break; |
533475d3 | 1016 | case VT_GETHIFONTMASK: |
9cc3c22b AC |
1017 | ret = put_user(vc->vc_hi_font_mask, |
1018 | (unsigned short __user *)arg); | |
1019 | break; | |
8b92e87d AC |
1020 | case VT_WAITEVENT: |
1021 | ret = vt_event_wait_ioctl((struct vt_event __user *)arg); | |
1022 | break; | |
1da177e4 | 1023 | default: |
9cc3c22b | 1024 | ret = -ENOIOCTLCMD; |
1da177e4 | 1025 | } |
9cc3c22b | 1026 | out: |
9cc3c22b | 1027 | return ret; |
1da177e4 LT |
1028 | } |
1029 | ||
1da177e4 LT |
1030 | void reset_vc(struct vc_data *vc) |
1031 | { | |
1032 | vc->vc_mode = KD_TEXT; | |
079c9534 | 1033 | vt_reset_unicode(vc->vc_num); |
1da177e4 LT |
1034 | vc->vt_mode.mode = VT_AUTO; |
1035 | vc->vt_mode.waitv = 0; | |
1036 | vc->vt_mode.relsig = 0; | |
1037 | vc->vt_mode.acqsig = 0; | |
1038 | vc->vt_mode.frsig = 0; | |
8b6312f4 EB |
1039 | put_pid(vc->vt_pid); |
1040 | vc->vt_pid = NULL; | |
1da177e4 LT |
1041 | vc->vt_newvt = -1; |
1042 | if (!in_interrupt()) /* Via keyboard.c:SAK() - akpm */ | |
1043 | reset_palette(vc); | |
1044 | } | |
1045 | ||
8b6312f4 EB |
1046 | void vc_SAK(struct work_struct *work) |
1047 | { | |
1048 | struct vc *vc_con = | |
1049 | container_of(work, struct vc, SAK_work); | |
1050 | struct vc_data *vc; | |
1051 | struct tty_struct *tty; | |
1052 | ||
ac751efa | 1053 | console_lock(); |
8b6312f4 EB |
1054 | vc = vc_con->d; |
1055 | if (vc) { | |
079c9534 | 1056 | /* FIXME: review tty ref counting */ |
8ce73264 | 1057 | tty = vc->port.tty; |
8b6312f4 EB |
1058 | /* |
1059 | * SAK should also work in all raw modes and reset | |
1060 | * them properly. | |
1061 | */ | |
1062 | if (tty) | |
1063 | __do_SAK(tty); | |
1064 | reset_vc(vc); | |
1065 | } | |
ac751efa | 1066 | console_unlock(); |
8b6312f4 EB |
1067 | } |
1068 | ||
e9216651 AB |
1069 | #ifdef CONFIG_COMPAT |
1070 | ||
1071 | struct compat_consolefontdesc { | |
1072 | unsigned short charcount; /* characters in font (256 or 512) */ | |
1073 | unsigned short charheight; /* scan lines per character (1-32) */ | |
1074 | compat_caddr_t chardata; /* font data in expanded form */ | |
1075 | }; | |
1076 | ||
1077 | static inline int | |
1078 | compat_fontx_ioctl(int cmd, struct compat_consolefontdesc __user *user_cfd, | |
1079 | int perm, struct console_font_op *op) | |
1080 | { | |
1081 | struct compat_consolefontdesc cfdarg; | |
1082 | int i; | |
1083 | ||
1084 | if (copy_from_user(&cfdarg, user_cfd, sizeof(struct compat_consolefontdesc))) | |
1085 | return -EFAULT; | |
1086 | ||
1087 | switch (cmd) { | |
1088 | case PIO_FONTX: | |
1089 | if (!perm) | |
1090 | return -EPERM; | |
1091 | op->op = KD_FONT_OP_SET; | |
1092 | op->flags = KD_FONT_FLAG_OLD; | |
1093 | op->width = 8; | |
1094 | op->height = cfdarg.charheight; | |
1095 | op->charcount = cfdarg.charcount; | |
1096 | op->data = compat_ptr(cfdarg.chardata); | |
1097 | return con_font_op(vc_cons[fg_console].d, op); | |
1098 | case GIO_FONTX: | |
1099 | op->op = KD_FONT_OP_GET; | |
1100 | op->flags = KD_FONT_FLAG_OLD; | |
1101 | op->width = 8; | |
1102 | op->height = cfdarg.charheight; | |
1103 | op->charcount = cfdarg.charcount; | |
1104 | op->data = compat_ptr(cfdarg.chardata); | |
1105 | i = con_font_op(vc_cons[fg_console].d, op); | |
1106 | if (i) | |
1107 | return i; | |
1108 | cfdarg.charheight = op->height; | |
1109 | cfdarg.charcount = op->charcount; | |
1110 | if (copy_to_user(user_cfd, &cfdarg, sizeof(struct compat_consolefontdesc))) | |
1111 | return -EFAULT; | |
1112 | return 0; | |
1113 | } | |
1114 | return -EINVAL; | |
1115 | } | |
1116 | ||
1117 | struct compat_console_font_op { | |
1118 | compat_uint_t op; /* operation code KD_FONT_OP_* */ | |
1119 | compat_uint_t flags; /* KD_FONT_FLAG_* */ | |
1120 | compat_uint_t width, height; /* font size */ | |
1121 | compat_uint_t charcount; | |
1122 | compat_caddr_t data; /* font data with height fixed to 32 */ | |
1123 | }; | |
1124 | ||
1125 | static inline int | |
1126 | compat_kdfontop_ioctl(struct compat_console_font_op __user *fontop, | |
1127 | int perm, struct console_font_op *op, struct vc_data *vc) | |
1128 | { | |
1129 | int i; | |
1130 | ||
1131 | if (copy_from_user(op, fontop, sizeof(struct compat_console_font_op))) | |
1132 | return -EFAULT; | |
1133 | if (!perm && op->op != KD_FONT_OP_GET) | |
1134 | return -EPERM; | |
1135 | op->data = compat_ptr(((struct compat_console_font_op *)op)->data); | |
e9216651 AB |
1136 | i = con_font_op(vc, op); |
1137 | if (i) | |
1138 | return i; | |
1139 | ((struct compat_console_font_op *)op)->data = (unsigned long)op->data; | |
1140 | if (copy_to_user(fontop, op, sizeof(struct compat_console_font_op))) | |
1141 | return -EFAULT; | |
1142 | return 0; | |
1143 | } | |
1144 | ||
1145 | struct compat_unimapdesc { | |
1146 | unsigned short entry_ct; | |
1147 | compat_caddr_t entries; | |
1148 | }; | |
1149 | ||
1150 | static inline int | |
1151 | compat_unimap_ioctl(unsigned int cmd, struct compat_unimapdesc __user *user_ud, | |
1152 | int perm, struct vc_data *vc) | |
1153 | { | |
1154 | struct compat_unimapdesc tmp; | |
1155 | struct unipair __user *tmp_entries; | |
1156 | ||
1157 | if (copy_from_user(&tmp, user_ud, sizeof tmp)) | |
1158 | return -EFAULT; | |
1159 | tmp_entries = compat_ptr(tmp.entries); | |
e9216651 AB |
1160 | switch (cmd) { |
1161 | case PIO_UNIMAP: | |
1162 | if (!perm) | |
1163 | return -EPERM; | |
1164 | return con_set_unimap(vc, tmp.entry_ct, tmp_entries); | |
1165 | case GIO_UNIMAP: | |
1166 | if (!perm && fg_console != vc->vc_num) | |
1167 | return -EPERM; | |
1168 | return con_get_unimap(vc, tmp.entry_ct, &(user_ud->entry_ct), tmp_entries); | |
1169 | } | |
1170 | return 0; | |
1171 | } | |
1172 | ||
6caa76b7 | 1173 | long vt_compat_ioctl(struct tty_struct *tty, |
e9216651 AB |
1174 | unsigned int cmd, unsigned long arg) |
1175 | { | |
1176 | struct vc_data *vc = tty->driver_data; | |
1177 | struct console_font_op op; /* used in multiple places here */ | |
e9216651 AB |
1178 | unsigned int console; |
1179 | void __user *up = (void __user *)arg; | |
1180 | int perm; | |
1181 | int ret = 0; | |
1182 | ||
1183 | console = vc->vc_num; | |
1184 | ||
e9216651 AB |
1185 | if (!vc_cons_allocated(console)) { /* impossible? */ |
1186 | ret = -ENOIOCTLCMD; | |
1187 | goto out; | |
1188 | } | |
1189 | ||
1190 | /* | |
1191 | * To have permissions to do most of the vt ioctls, we either have | |
1192 | * to be the owner of the tty, or have CAP_SYS_TTY_CONFIG. | |
1193 | */ | |
1194 | perm = 0; | |
1195 | if (current->signal->tty == tty || capable(CAP_SYS_TTY_CONFIG)) | |
1196 | perm = 1; | |
1197 | ||
e9216651 AB |
1198 | switch (cmd) { |
1199 | /* | |
1200 | * these need special handlers for incompatible data structures | |
1201 | */ | |
1202 | case PIO_FONTX: | |
1203 | case GIO_FONTX: | |
1204 | ret = compat_fontx_ioctl(cmd, up, perm, &op); | |
1205 | break; | |
1206 | ||
1207 | case KDFONTOP: | |
1208 | ret = compat_kdfontop_ioctl(up, perm, &op, vc); | |
1209 | break; | |
1210 | ||
1211 | case PIO_UNIMAP: | |
1212 | case GIO_UNIMAP: | |
4b1fe779 | 1213 | ret = compat_unimap_ioctl(cmd, up, perm, vc); |
e9216651 AB |
1214 | break; |
1215 | ||
1216 | /* | |
1217 | * all these treat 'arg' as an integer | |
1218 | */ | |
1219 | case KIOCSOUND: | |
1220 | case KDMKTONE: | |
1221 | #ifdef CONFIG_X86 | |
1222 | case KDADDIO: | |
1223 | case KDDELIO: | |
1224 | #endif | |
1225 | case KDSETMODE: | |
1226 | case KDMAPDISP: | |
1227 | case KDUNMAPDISP: | |
1228 | case KDSKBMODE: | |
1229 | case KDSKBMETA: | |
1230 | case KDSKBLED: | |
1231 | case KDSETLED: | |
1232 | case KDSIGACCEPT: | |
1233 | case VT_ACTIVATE: | |
1234 | case VT_WAITACTIVE: | |
1235 | case VT_RELDISP: | |
1236 | case VT_DISALLOCATE: | |
1237 | case VT_RESIZE: | |
1238 | case VT_RESIZEX: | |
1239 | goto fallback; | |
1240 | ||
1241 | /* | |
1242 | * the rest has a compatible data structure behind arg, | |
1243 | * but we have to convert it to a proper 64 bit pointer. | |
1244 | */ | |
1245 | default: | |
1246 | arg = (unsigned long)compat_ptr(arg); | |
1247 | goto fallback; | |
1248 | } | |
1249 | out: | |
e9216651 AB |
1250 | return ret; |
1251 | ||
1252 | fallback: | |
6caa76b7 | 1253 | return vt_ioctl(tty, cmd, arg); |
e9216651 AB |
1254 | } |
1255 | ||
1256 | ||
1257 | #endif /* CONFIG_COMPAT */ | |
1258 | ||
1259 | ||
1da177e4 | 1260 | /* |
d3b5cffc AC |
1261 | * Performs the back end of a vt switch. Called under the console |
1262 | * semaphore. | |
1da177e4 LT |
1263 | */ |
1264 | static void complete_change_console(struct vc_data *vc) | |
1265 | { | |
1266 | unsigned char old_vc_mode; | |
8b92e87d | 1267 | int old = fg_console; |
1da177e4 LT |
1268 | |
1269 | last_console = fg_console; | |
1270 | ||
1271 | /* | |
1272 | * If we're switching, we could be going from KD_GRAPHICS to | |
1273 | * KD_TEXT mode or vice versa, which means we need to blank or | |
1274 | * unblank the screen later. | |
1275 | */ | |
1276 | old_vc_mode = vc_cons[fg_console].d->vc_mode; | |
1277 | switch_screen(vc); | |
1278 | ||
1279 | /* | |
3dfcaf16 | 1280 | * This can't appear below a successful kill_pid(). If it did, |
1da177e4 LT |
1281 | * then the *blank_screen operation could occur while X, having |
1282 | * received acqsig, is waking up on another processor. This | |
1283 | * condition can lead to overlapping accesses to the VGA range | |
1284 | * and the framebuffer (causing system lockups). | |
1285 | * | |
1286 | * To account for this we duplicate this code below only if the | |
1287 | * controlling process is gone and we've called reset_vc. | |
1288 | */ | |
1289 | if (old_vc_mode != vc->vc_mode) { | |
1290 | if (vc->vc_mode == KD_TEXT) | |
1291 | do_unblank_screen(1); | |
1292 | else | |
1293 | do_blank_screen(1); | |
1294 | } | |
1295 | ||
1296 | /* | |
1297 | * If this new console is under process control, send it a signal | |
1298 | * telling it that it has acquired. Also check if it has died and | |
1299 | * clean up (similar to logic employed in change_console()) | |
1300 | */ | |
87a6aca5 | 1301 | if (vc->vt_mode.mode == VT_PROCESS) { |
1da177e4 | 1302 | /* |
3dfcaf16 | 1303 | * Send the signal as privileged - kill_pid() will |
1da177e4 LT |
1304 | * tell us if the process has gone or something else |
1305 | * is awry | |
1306 | */ | |
bde0d2c9 | 1307 | if (kill_pid(vc->vt_pid, vc->vt_mode.acqsig, 1) != 0) { |
1da177e4 LT |
1308 | /* |
1309 | * The controlling process has died, so we revert back to | |
1310 | * normal operation. In this case, we'll also change back | |
1311 | * to KD_TEXT mode. I'm not sure if this is strictly correct | |
1312 | * but it saves the agony when the X server dies and the screen | |
1313 | * remains blanked due to KD_GRAPHICS! It would be nice to do | |
1314 | * this outside of VT_PROCESS but there is no single process | |
1315 | * to account for and tracking tty count may be undesirable. | |
1316 | */ | |
1317 | reset_vc(vc); | |
1318 | ||
1319 | if (old_vc_mode != vc->vc_mode) { | |
1320 | if (vc->vc_mode == KD_TEXT) | |
1321 | do_unblank_screen(1); | |
1322 | else | |
1323 | do_blank_screen(1); | |
1324 | } | |
1325 | } | |
1326 | } | |
1327 | ||
1328 | /* | |
1329 | * Wake anyone waiting for their VT to activate | |
1330 | */ | |
8b92e87d | 1331 | vt_event_post(VT_EVENT_SWITCH, old, vc->vc_num); |
1da177e4 LT |
1332 | return; |
1333 | } | |
1334 | ||
1335 | /* | |
1336 | * Performs the front-end of a vt switch | |
1337 | */ | |
1338 | void change_console(struct vc_data *new_vc) | |
1339 | { | |
1340 | struct vc_data *vc; | |
1341 | ||
1342 | if (!new_vc || new_vc->vc_num == fg_console || vt_dont_switch) | |
1343 | return; | |
1344 | ||
1345 | /* | |
1346 | * If this vt is in process mode, then we need to handshake with | |
1347 | * that process before switching. Essentially, we store where that | |
1348 | * vt wants to switch to and wait for it to tell us when it's done | |
1349 | * (via VT_RELDISP ioctl). | |
1350 | * | |
1351 | * We also check to see if the controlling process still exists. | |
1352 | * If it doesn't, we reset this vt to auto mode and continue. | |
1353 | * This is a cheap way to track process control. The worst thing | |
1354 | * that can happen is: we send a signal to a process, it dies, and | |
1355 | * the switch gets "lost" waiting for a response; hopefully, the | |
1356 | * user will try again, we'll detect the process is gone (unless | |
1357 | * the user waits just the right amount of time :-) and revert the | |
1358 | * vt to auto control. | |
1359 | */ | |
1360 | vc = vc_cons[fg_console].d; | |
87a6aca5 | 1361 | if (vc->vt_mode.mode == VT_PROCESS) { |
1da177e4 | 1362 | /* |
3dfcaf16 | 1363 | * Send the signal as privileged - kill_pid() will |
1da177e4 | 1364 | * tell us if the process has gone or something else |
a64314e6 JL |
1365 | * is awry. |
1366 | * | |
1367 | * We need to set vt_newvt *before* sending the signal or we | |
1368 | * have a race. | |
1da177e4 | 1369 | */ |
a64314e6 | 1370 | vc->vt_newvt = new_vc->vc_num; |
bde0d2c9 | 1371 | if (kill_pid(vc->vt_pid, vc->vt_mode.relsig, 1) == 0) { |
1da177e4 | 1372 | /* |
87a6aca5 GKH |
1373 | * It worked. Mark the vt to switch to and |
1374 | * return. The process needs to send us a | |
1375 | * VT_RELDISP ioctl to complete the switch. | |
1da177e4 | 1376 | */ |
87a6aca5 | 1377 | return; |
1da177e4 LT |
1378 | } |
1379 | ||
1380 | /* | |
87a6aca5 GKH |
1381 | * The controlling process has died, so we revert back to |
1382 | * normal operation. In this case, we'll also change back | |
1383 | * to KD_TEXT mode. I'm not sure if this is strictly correct | |
1384 | * but it saves the agony when the X server dies and the screen | |
1385 | * remains blanked due to KD_GRAPHICS! It would be nice to do | |
1386 | * this outside of VT_PROCESS but there is no single process | |
1387 | * to account for and tracking tty count may be undesirable. | |
1388 | */ | |
1389 | reset_vc(vc); | |
1390 | ||
1391 | /* | |
1392 | * Fall through to normal (VT_AUTO) handling of the switch... | |
1da177e4 LT |
1393 | */ |
1394 | } | |
1395 | ||
1396 | /* | |
1397 | * Ignore all switches in KD_GRAPHICS+VT_AUTO mode | |
1398 | */ | |
1399 | if (vc->vc_mode == KD_GRAPHICS) | |
1400 | return; | |
1401 | ||
1402 | complete_change_console(new_vc); | |
1403 | } | |
8d233558 AC |
1404 | |
1405 | /* Perform a kernel triggered VT switch for suspend/resume */ | |
1406 | ||
1407 | static int disable_vt_switch; | |
1408 | ||
1409 | int vt_move_to_console(unsigned int vt, int alloc) | |
1410 | { | |
1411 | int prev; | |
1412 | ||
ac751efa | 1413 | console_lock(); |
8d233558 AC |
1414 | /* Graphics mode - up to X */ |
1415 | if (disable_vt_switch) { | |
ac751efa | 1416 | console_unlock(); |
8d233558 AC |
1417 | return 0; |
1418 | } | |
1419 | prev = fg_console; | |
1420 | ||
1421 | if (alloc && vc_allocate(vt)) { | |
1422 | /* we can't have a free VC for now. Too bad, | |
1423 | * we don't want to mess the screen for now. */ | |
ac751efa | 1424 | console_unlock(); |
8d233558 AC |
1425 | return -ENOSPC; |
1426 | } | |
1427 | ||
1428 | if (set_console(vt)) { | |
1429 | /* | |
1430 | * We're unable to switch to the SUSPEND_CONSOLE. | |
1431 | * Let the calling function know so it can decide | |
1432 | * what to do. | |
1433 | */ | |
ac751efa | 1434 | console_unlock(); |
8d233558 AC |
1435 | return -EIO; |
1436 | } | |
ac751efa | 1437 | console_unlock(); |
797938b5 | 1438 | if (vt_waitactive(vt + 1)) { |
8d233558 AC |
1439 | pr_debug("Suspend: Can't switch VCs."); |
1440 | return -EINTR; | |
1441 | } | |
1442 | return prev; | |
1443 | } | |
1444 | ||
1445 | /* | |
1446 | * Normally during a suspend, we allocate a new console and switch to it. | |
1447 | * When we resume, we switch back to the original console. This switch | |
1448 | * can be slow, so on systems where the framebuffer can handle restoration | |
1449 | * of video registers anyways, there's little point in doing the console | |
1450 | * switch. This function allows you to disable it by passing it '0'. | |
1451 | */ | |
1452 | void pm_set_vt_switch(int do_switch) | |
1453 | { | |
ac751efa | 1454 | console_lock(); |
8d233558 | 1455 | disable_vt_switch = !do_switch; |
ac751efa | 1456 | console_unlock(); |
8d233558 AC |
1457 | } |
1458 | EXPORT_SYMBOL(pm_set_vt_switch); |