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 LT |
34 | |
35 | #include <linux/kbd_kern.h> | |
36 | #include <linux/vt_kern.h> | |
37 | #include <linux/kbd_diacr.h> | |
38 | #include <linux/selection.h> | |
39 | ||
b257bc05 | 40 | char vt_dont_switch; |
1da177e4 LT |
41 | extern struct tty_driver *console_driver; |
42 | ||
43 | #define VT_IS_IN_USE(i) (console_driver->ttys[i] && console_driver->ttys[i]->count) | |
44 | #define VT_BUSY(i) (VT_IS_IN_USE(i) || i == fg_console || vc_cons[i].d == sel_cons) | |
45 | ||
46 | /* | |
47 | * Console (vt and kd) routines, as defined by USL SVR4 manual, and by | |
48 | * experimentation and study of X386 SYSV handling. | |
49 | * | |
50 | * One point of difference: SYSV vt's are /dev/vtX, which X >= 0, and | |
51 | * /dev/console is a separate ttyp. Under Linux, /dev/tty0 is /dev/console, | |
52 | * and the vc start at /dev/ttyX, X >= 1. We maintain that here, so we will | |
53 | * always treat our set of vt as numbered 1..MAX_NR_CONSOLES (corresponding to | |
54 | * ttys 0..MAX_NR_CONSOLES-1). Explicitly naming VT 0 is illegal, but using | |
55 | * /dev/tty0 (fg_console) as a target is legal, since an implicit aliasing | |
56 | * to the current console is done by the main ioctl code. | |
57 | */ | |
58 | ||
59 | #ifdef CONFIG_X86 | |
60 | #include <linux/syscalls.h> | |
61 | #endif | |
62 | ||
63 | static void complete_change_console(struct vc_data *vc); | |
64 | ||
8b92e87d AC |
65 | /* |
66 | * User space VT_EVENT handlers | |
67 | */ | |
68 | ||
69 | struct vt_event_wait { | |
70 | struct list_head list; | |
71 | struct vt_event event; | |
72 | int done; | |
73 | }; | |
74 | ||
75 | static LIST_HEAD(vt_events); | |
76 | static DEFINE_SPINLOCK(vt_event_lock); | |
77 | static DECLARE_WAIT_QUEUE_HEAD(vt_event_waitqueue); | |
78 | ||
79 | /** | |
80 | * vt_event_post | |
81 | * @event: the event that occurred | |
82 | * @old: old console | |
83 | * @new: new console | |
84 | * | |
85 | * Post an VT event to interested VT handlers | |
86 | */ | |
87 | ||
88 | void vt_event_post(unsigned int event, unsigned int old, unsigned int new) | |
89 | { | |
90 | struct list_head *pos, *head; | |
91 | unsigned long flags; | |
92 | int wake = 0; | |
93 | ||
94 | spin_lock_irqsave(&vt_event_lock, flags); | |
95 | head = &vt_events; | |
96 | ||
97 | list_for_each(pos, head) { | |
98 | struct vt_event_wait *ve = list_entry(pos, | |
99 | struct vt_event_wait, list); | |
100 | if (!(ve->event.event & event)) | |
101 | continue; | |
102 | ve->event.event = event; | |
103 | /* kernel view is consoles 0..n-1, user space view is | |
104 | console 1..n with 0 meaning current, so we must bias */ | |
308efab5 AC |
105 | ve->event.oldev = old + 1; |
106 | ve->event.newev = new + 1; | |
8b92e87d AC |
107 | wake = 1; |
108 | ve->done = 1; | |
109 | } | |
110 | spin_unlock_irqrestore(&vt_event_lock, flags); | |
111 | if (wake) | |
112 | wake_up_interruptible(&vt_event_waitqueue); | |
113 | } | |
114 | ||
a7b12929 | 115 | static void __vt_event_queue(struct vt_event_wait *vw) |
8b92e87d AC |
116 | { |
117 | unsigned long flags; | |
118 | /* Prepare the event */ | |
119 | INIT_LIST_HEAD(&vw->list); | |
120 | vw->done = 0; | |
121 | /* Queue our event */ | |
122 | spin_lock_irqsave(&vt_event_lock, flags); | |
123 | list_add(&vw->list, &vt_events); | |
124 | spin_unlock_irqrestore(&vt_event_lock, flags); | |
a7b12929 RV |
125 | } |
126 | ||
127 | static void __vt_event_wait(struct vt_event_wait *vw) | |
128 | { | |
8b92e87d | 129 | /* Wait for it to pass */ |
99cceb4e | 130 | wait_event_interruptible(vt_event_waitqueue, vw->done); |
a7b12929 RV |
131 | } |
132 | ||
133 | static void __vt_event_dequeue(struct vt_event_wait *vw) | |
134 | { | |
135 | unsigned long flags; | |
136 | ||
8b92e87d AC |
137 | /* Dequeue it */ |
138 | spin_lock_irqsave(&vt_event_lock, flags); | |
139 | list_del(&vw->list); | |
140 | spin_unlock_irqrestore(&vt_event_lock, flags); | |
141 | } | |
142 | ||
a7b12929 RV |
143 | /** |
144 | * vt_event_wait - wait for an event | |
145 | * @vw: our event | |
146 | * | |
147 | * Waits for an event to occur which completes our vt_event_wait | |
148 | * structure. On return the structure has wv->done set to 1 for success | |
149 | * or 0 if some event such as a signal ended the wait. | |
150 | */ | |
151 | ||
152 | static void vt_event_wait(struct vt_event_wait *vw) | |
153 | { | |
154 | __vt_event_queue(vw); | |
155 | __vt_event_wait(vw); | |
156 | __vt_event_dequeue(vw); | |
157 | } | |
158 | ||
8b92e87d AC |
159 | /** |
160 | * vt_event_wait_ioctl - event ioctl handler | |
161 | * @arg: argument to ioctl | |
162 | * | |
163 | * Implement the VT_WAITEVENT ioctl using the VT event interface | |
164 | */ | |
165 | ||
166 | static int vt_event_wait_ioctl(struct vt_event __user *event) | |
167 | { | |
168 | struct vt_event_wait vw; | |
169 | ||
170 | if (copy_from_user(&vw.event, event, sizeof(struct vt_event))) | |
171 | return -EFAULT; | |
172 | /* Highest supported event for now */ | |
173 | if (vw.event.event & ~VT_MAX_EVENT) | |
174 | return -EINVAL; | |
175 | ||
176 | vt_event_wait(&vw); | |
177 | /* If it occurred report it */ | |
178 | if (vw.done) { | |
179 | if (copy_to_user(event, &vw.event, sizeof(struct vt_event))) | |
180 | return -EFAULT; | |
181 | return 0; | |
182 | } | |
183 | return -EINTR; | |
184 | } | |
185 | ||
186 | /** | |
187 | * vt_waitactive - active console wait | |
188 | * @event: event code | |
189 | * @n: new console | |
190 | * | |
191 | * Helper for event waits. Used to implement the legacy | |
192 | * event waiting ioctls in terms of events | |
193 | */ | |
194 | ||
195 | int vt_waitactive(int n) | |
196 | { | |
197 | struct vt_event_wait vw; | |
198 | do { | |
8b92e87d | 199 | vw.event.event = VT_EVENT_SWITCH; |
a7b12929 RV |
200 | __vt_event_queue(&vw); |
201 | if (n == fg_console + 1) { | |
202 | __vt_event_dequeue(&vw); | |
203 | break; | |
204 | } | |
205 | __vt_event_wait(&vw); | |
206 | __vt_event_dequeue(&vw); | |
8b92e87d AC |
207 | if (vw.done == 0) |
208 | return -EINTR; | |
308efab5 | 209 | } while (vw.event.newev != n); |
8b92e87d AC |
210 | return 0; |
211 | } | |
212 | ||
1da177e4 LT |
213 | /* |
214 | * these are the valid i/o ports we're allowed to change. they map all the | |
215 | * video ports | |
216 | */ | |
217 | #define GPFIRST 0x3b4 | |
218 | #define GPLAST 0x3df | |
219 | #define GPNUM (GPLAST - GPFIRST + 1) | |
220 | ||
1da177e4 | 221 | |
1da177e4 LT |
222 | |
223 | static inline int | |
224 | do_fontx_ioctl(int cmd, struct consolefontdesc __user *user_cfd, int perm, struct console_font_op *op) | |
225 | { | |
226 | struct consolefontdesc cfdarg; | |
227 | int i; | |
228 | ||
229 | if (copy_from_user(&cfdarg, user_cfd, sizeof(struct consolefontdesc))) | |
230 | return -EFAULT; | |
231 | ||
232 | switch (cmd) { | |
233 | case PIO_FONTX: | |
234 | if (!perm) | |
235 | return -EPERM; | |
236 | op->op = KD_FONT_OP_SET; | |
237 | op->flags = KD_FONT_FLAG_OLD; | |
238 | op->width = 8; | |
239 | op->height = cfdarg.charheight; | |
240 | op->charcount = cfdarg.charcount; | |
241 | op->data = cfdarg.chardata; | |
242 | return con_font_op(vc_cons[fg_console].d, op); | |
243 | case GIO_FONTX: { | |
244 | op->op = KD_FONT_OP_GET; | |
245 | op->flags = KD_FONT_FLAG_OLD; | |
246 | op->width = 8; | |
247 | op->height = cfdarg.charheight; | |
248 | op->charcount = cfdarg.charcount; | |
249 | op->data = cfdarg.chardata; | |
250 | i = con_font_op(vc_cons[fg_console].d, op); | |
251 | if (i) | |
252 | return i; | |
253 | cfdarg.charheight = op->height; | |
254 | cfdarg.charcount = op->charcount; | |
255 | if (copy_to_user(user_cfd, &cfdarg, sizeof(struct consolefontdesc))) | |
256 | return -EFAULT; | |
257 | return 0; | |
258 | } | |
259 | } | |
260 | return -EINVAL; | |
261 | } | |
262 | ||
263 | static inline int | |
264 | do_unimap_ioctl(int cmd, struct unimapdesc __user *user_ud, int perm, struct vc_data *vc) | |
265 | { | |
266 | struct unimapdesc tmp; | |
267 | ||
268 | if (copy_from_user(&tmp, user_ud, sizeof tmp)) | |
269 | return -EFAULT; | |
1da177e4 LT |
270 | switch (cmd) { |
271 | case PIO_UNIMAP: | |
272 | if (!perm) | |
273 | return -EPERM; | |
274 | return con_set_unimap(vc, tmp.entry_ct, tmp.entries); | |
275 | case GIO_UNIMAP: | |
276 | if (!perm && fg_console != vc->vc_num) | |
277 | return -EPERM; | |
278 | return con_get_unimap(vc, tmp.entry_ct, &(user_ud->entry_ct), tmp.entries); | |
279 | } | |
280 | return 0; | |
281 | } | |
282 | ||
421b40a6 PH |
283 | /* deallocate a single console, if possible (leave 0) */ |
284 | static int vt_disallocate(unsigned int vc_num) | |
285 | { | |
286 | struct vc_data *vc = NULL; | |
287 | int ret = 0; | |
288 | ||
421b40a6 PH |
289 | console_lock(); |
290 | if (VT_BUSY(vc_num)) | |
291 | ret = -EBUSY; | |
ef223fb3 | 292 | else if (vc_num) |
421b40a6 PH |
293 | vc = vc_deallocate(vc_num); |
294 | console_unlock(); | |
295 | ||
296 | if (vc && vc_num >= MIN_NR_CONSOLES) { | |
297 | tty_port_destroy(&vc->port); | |
298 | kfree(vc); | |
299 | } | |
300 | ||
301 | return ret; | |
302 | } | |
303 | ||
304 | /* deallocate all unused consoles, but leave 0 */ | |
305 | static void vt_disallocate_all(void) | |
306 | { | |
307 | struct vc_data *vc[MAX_NR_CONSOLES]; | |
308 | int i; | |
309 | ||
310 | console_lock(); | |
311 | for (i = 1; i < MAX_NR_CONSOLES; i++) | |
312 | if (!VT_BUSY(i)) | |
313 | vc[i] = vc_deallocate(i); | |
314 | else | |
315 | vc[i] = NULL; | |
316 | console_unlock(); | |
317 | ||
318 | for (i = 1; i < MAX_NR_CONSOLES; i++) { | |
319 | if (vc[i] && i >= MIN_NR_CONSOLES) { | |
320 | tty_port_destroy(&vc[i]->port); | |
321 | kfree(vc[i]); | |
322 | } | |
323 | } | |
324 | } | |
8b92e87d AC |
325 | |
326 | ||
1da177e4 LT |
327 | /* |
328 | * We handle the console-specific ioctl's here. We allow the | |
329 | * capability to modify any console, not just the fg_console. | |
330 | */ | |
6caa76b7 | 331 | int vt_ioctl(struct tty_struct *tty, |
1da177e4 LT |
332 | unsigned int cmd, unsigned long arg) |
333 | { | |
c9f19e96 | 334 | struct vc_data *vc = tty->driver_data; |
1da177e4 | 335 | struct console_font_op op; /* used in multiple places here */ |
1da177e4 LT |
336 | unsigned int console; |
337 | unsigned char ucval; | |
1e0ad288 | 338 | unsigned int uival; |
1da177e4 LT |
339 | void __user *up = (void __user *)arg; |
340 | int i, perm; | |
9cc3c22b AC |
341 | int ret = 0; |
342 | ||
1da177e4 LT |
343 | console = vc->vc_num; |
344 | ||
9cc3c22b AC |
345 | |
346 | if (!vc_cons_allocated(console)) { /* impossible? */ | |
347 | ret = -ENOIOCTLCMD; | |
348 | goto out; | |
349 | } | |
350 | ||
1da177e4 LT |
351 | |
352 | /* | |
353 | * To have permissions to do most of the vt ioctls, we either have | |
354 | * to be the owner of the tty, or have CAP_SYS_TTY_CONFIG. | |
355 | */ | |
356 | perm = 0; | |
357 | if (current->signal->tty == tty || capable(CAP_SYS_TTY_CONFIG)) | |
358 | perm = 1; | |
359 | ||
1da177e4 | 360 | switch (cmd) { |
e6885107 | 361 | case TIOCLINUX: |
a115902f JS |
362 | ret = tioclinux(tty, arg); |
363 | break; | |
1da177e4 LT |
364 | case KIOCSOUND: |
365 | if (!perm) | |
4001d7b7 | 366 | return -EPERM; |
2c4e9671 AB |
367 | /* |
368 | * The use of PIT_TICK_RATE is historic, it used to be | |
369 | * the platform-dependent CLOCK_TICK_RATE between 2.6.12 | |
370 | * and 2.6.36, which was a minor but unfortunate ABI | |
4001d7b7 | 371 | * change. kd_mksound is locked by the input layer. |
2c4e9671 | 372 | */ |
1da177e4 | 373 | if (arg) |
2c4e9671 | 374 | arg = PIT_TICK_RATE / arg; |
1da177e4 | 375 | kd_mksound(arg, 0); |
9cc3c22b | 376 | break; |
1da177e4 LT |
377 | |
378 | case KDMKTONE: | |
379 | if (!perm) | |
4001d7b7 | 380 | return -EPERM; |
1da177e4 LT |
381 | { |
382 | unsigned int ticks, count; | |
383 | ||
384 | /* | |
385 | * Generate the tone for the appropriate number of ticks. | |
386 | * If the time is zero, turn off sound ourselves. | |
387 | */ | |
4c0d9b17 | 388 | ticks = msecs_to_jiffies((arg >> 16) & 0xffff); |
1da177e4 LT |
389 | count = ticks ? (arg & 0xffff) : 0; |
390 | if (count) | |
2c4e9671 | 391 | count = PIT_TICK_RATE / count; |
1da177e4 | 392 | kd_mksound(count, ticks); |
9cc3c22b | 393 | break; |
1da177e4 LT |
394 | } |
395 | ||
396 | case KDGKBTYPE: | |
397 | /* | |
4001d7b7 | 398 | * this is naïve. |
1da177e4 LT |
399 | */ |
400 | ucval = KB_101; | |
079c9534 AC |
401 | ret = put_user(ucval, (char __user *)arg); |
402 | break; | |
1da177e4 LT |
403 | |
404 | /* | |
405 | * These cannot be implemented on any machine that implements | |
406 | * ioperm() in user level (such as Alpha PCs) or not at all. | |
407 | * | |
408 | * XXX: you should never use these, just call ioperm directly.. | |
409 | */ | |
410 | #ifdef CONFIG_X86 | |
411 | case KDADDIO: | |
412 | case KDDELIO: | |
413 | /* | |
414 | * KDADDIO and KDDELIO may be able to add ports beyond what | |
415 | * we reject here, but to be safe... | |
4001d7b7 AC |
416 | * |
417 | * These are locked internally via sys_ioperm | |
1da177e4 | 418 | */ |
9cc3c22b AC |
419 | if (arg < GPFIRST || arg > GPLAST) { |
420 | ret = -EINVAL; | |
421 | break; | |
422 | } | |
423 | ret = sys_ioperm(arg, 1, (cmd == KDADDIO)) ? -ENXIO : 0; | |
424 | break; | |
1da177e4 LT |
425 | |
426 | case KDENABIO: | |
427 | case KDDISABIO: | |
9cc3c22b | 428 | ret = sys_ioperm(GPFIRST, GPNUM, |
1da177e4 | 429 | (cmd == KDENABIO)) ? -ENXIO : 0; |
9cc3c22b | 430 | break; |
1da177e4 LT |
431 | #endif |
432 | ||
433 | /* Linux m68k/i386 interface for setting the keyboard delay/repeat rate */ | |
434 | ||
435 | case KDKBDREP: | |
436 | { | |
437 | struct kbd_repeat kbrep; | |
1da177e4 LT |
438 | |
439 | if (!capable(CAP_SYS_TTY_CONFIG)) | |
4001d7b7 | 440 | return -EPERM; |
1da177e4 | 441 | |
9cc3c22b AC |
442 | if (copy_from_user(&kbrep, up, sizeof(struct kbd_repeat))) { |
443 | ret = -EFAULT; | |
444 | break; | |
445 | } | |
446 | ret = kbd_rate(&kbrep); | |
447 | if (ret) | |
448 | break; | |
1da177e4 | 449 | if (copy_to_user(up, &kbrep, sizeof(struct kbd_repeat))) |
9cc3c22b AC |
450 | ret = -EFAULT; |
451 | break; | |
1da177e4 LT |
452 | } |
453 | ||
454 | case KDSETMODE: | |
455 | /* | |
456 | * currently, setting the mode from KD_TEXT to KD_GRAPHICS | |
457 | * doesn't do a whole lot. i'm not sure if it should do any | |
458 | * restoration of modes or what... | |
459 | * | |
460 | * XXX It should at least call into the driver, fbdev's definitely | |
461 | * need to restore their engine state. --BenH | |
462 | */ | |
463 | if (!perm) | |
4001d7b7 | 464 | return -EPERM; |
1da177e4 LT |
465 | switch (arg) { |
466 | case KD_GRAPHICS: | |
467 | break; | |
468 | case KD_TEXT0: | |
469 | case KD_TEXT1: | |
470 | arg = KD_TEXT; | |
471 | case KD_TEXT: | |
472 | break; | |
473 | default: | |
9cc3c22b AC |
474 | ret = -EINVAL; |
475 | goto out; | |
1da177e4 | 476 | } |
4001d7b7 | 477 | /* FIXME: this needs the console lock extending */ |
1da177e4 | 478 | if (vc->vc_mode == (unsigned char) arg) |
9cc3c22b | 479 | break; |
1da177e4 LT |
480 | vc->vc_mode = (unsigned char) arg; |
481 | if (console != fg_console) | |
9cc3c22b | 482 | break; |
1da177e4 LT |
483 | /* |
484 | * explicitly blank/unblank the screen if switching modes | |
485 | */ | |
ac751efa | 486 | console_lock(); |
1da177e4 LT |
487 | if (arg == KD_TEXT) |
488 | do_unblank_screen(1); | |
489 | else | |
490 | do_blank_screen(1); | |
ac751efa | 491 | console_unlock(); |
9cc3c22b | 492 | break; |
1da177e4 LT |
493 | |
494 | case KDGETMODE: | |
1e0ad288 | 495 | uival = vc->vc_mode; |
1da177e4 LT |
496 | goto setint; |
497 | ||
498 | case KDMAPDISP: | |
499 | case KDUNMAPDISP: | |
500 | /* | |
501 | * these work like a combination of mmap and KDENABIO. | |
502 | * this could be easily finished. | |
503 | */ | |
9cc3c22b AC |
504 | ret = -EINVAL; |
505 | break; | |
1da177e4 LT |
506 | |
507 | case KDSKBMODE: | |
508 | if (!perm) | |
4001d7b7 | 509 | return -EPERM; |
079c9534 AC |
510 | ret = vt_do_kdskbmode(console, arg); |
511 | if (ret == 0) | |
512 | tty_ldisc_flush(tty); | |
9cc3c22b | 513 | break; |
1da177e4 LT |
514 | |
515 | case KDGKBMODE: | |
079c9534 AC |
516 | uival = vt_do_kdgkbmode(console); |
517 | ret = put_user(uival, (int __user *)arg); | |
518 | break; | |
1da177e4 LT |
519 | |
520 | /* this could be folded into KDSKBMODE, but for compatibility | |
521 | reasons it is not so easy to fold KDGKBMETA into KDGKBMODE */ | |
522 | case KDSKBMETA: | |
079c9534 | 523 | ret = vt_do_kdskbmeta(console, arg); |
9cc3c22b | 524 | break; |
1da177e4 LT |
525 | |
526 | case KDGKBMETA: | |
079c9534 AC |
527 | /* FIXME: should review whether this is worth locking */ |
528 | uival = vt_do_kdgkbmeta(console); | |
1da177e4 | 529 | setint: |
1e0ad288 | 530 | ret = put_user(uival, (int __user *)arg); |
9cc3c22b | 531 | break; |
1da177e4 LT |
532 | |
533 | case KDGETKEYCODE: | |
534 | case KDSETKEYCODE: | |
535 | if(!capable(CAP_SYS_TTY_CONFIG)) | |
9cc3c22b | 536 | perm = 0; |
079c9534 | 537 | ret = vt_do_kbkeycode_ioctl(cmd, up, perm); |
9cc3c22b | 538 | break; |
1da177e4 LT |
539 | |
540 | case KDGKBENT: | |
541 | case KDSKBENT: | |
079c9534 | 542 | ret = vt_do_kdsk_ioctl(cmd, up, perm, console); |
9cc3c22b | 543 | break; |
1da177e4 LT |
544 | |
545 | case KDGKBSENT: | |
546 | case KDSKBSENT: | |
079c9534 | 547 | ret = vt_do_kdgkb_ioctl(cmd, up, perm); |
9cc3c22b | 548 | break; |
1da177e4 | 549 | |
247ff8e6 AC |
550 | /* Diacritical processing. Handled in keyboard.c as it has |
551 | to operate on the keyboard locks and structures */ | |
1da177e4 | 552 | case KDGKBDIACR: |
04c71976 | 553 | case KDGKBDIACRUC: |
1da177e4 | 554 | case KDSKBDIACR: |
04c71976 | 555 | case KDSKBDIACRUC: |
247ff8e6 | 556 | ret = vt_do_diacrit(cmd, up, perm); |
9cc3c22b | 557 | break; |
1da177e4 LT |
558 | |
559 | /* the ioctls below read/set the flags usually shown in the leds */ | |
560 | /* don't use them - they will go away without warning */ | |
561 | case KDGKBLED: | |
1da177e4 | 562 | case KDSKBLED: |
1da177e4 | 563 | case KDGETLED: |
1da177e4 | 564 | case KDSETLED: |
079c9534 | 565 | ret = vt_do_kdskled(console, cmd, arg, perm); |
9cc3c22b | 566 | break; |
1da177e4 LT |
567 | |
568 | /* | |
569 | * A process can indicate its willingness to accept signals | |
570 | * generated by pressing an appropriate key combination. | |
571 | * Thus, one can have a daemon that e.g. spawns a new console | |
572 | * upon a keypress and then changes to it. | |
573 | * See also the kbrequest field of inittab(5). | |
574 | */ | |
575 | case KDSIGACCEPT: | |
576 | { | |
1da177e4 | 577 | if (!perm || !capable(CAP_KILL)) |
4001d7b7 | 578 | return -EPERM; |
7ed20e1a | 579 | if (!valid_signal(arg) || arg < 1 || arg == SIGKILL) |
9cc3c22b AC |
580 | ret = -EINVAL; |
581 | else { | |
582 | spin_lock_irq(&vt_spawn_con.lock); | |
583 | put_pid(vt_spawn_con.pid); | |
584 | vt_spawn_con.pid = get_pid(task_pid(current)); | |
585 | vt_spawn_con.sig = arg; | |
586 | spin_unlock_irq(&vt_spawn_con.lock); | |
587 | } | |
588 | break; | |
1da177e4 LT |
589 | } |
590 | ||
591 | case VT_SETMODE: | |
592 | { | |
593 | struct vt_mode tmp; | |
594 | ||
595 | if (!perm) | |
4001d7b7 | 596 | return -EPERM; |
9cc3c22b AC |
597 | if (copy_from_user(&tmp, up, sizeof(struct vt_mode))) { |
598 | ret = -EFAULT; | |
599 | goto out; | |
600 | } | |
87a6aca5 | 601 | if (tmp.mode != VT_AUTO && tmp.mode != VT_PROCESS) { |
9cc3c22b AC |
602 | ret = -EINVAL; |
603 | goto out; | |
604 | } | |
ac751efa | 605 | console_lock(); |
1da177e4 LT |
606 | vc->vt_mode = tmp; |
607 | /* the frsig is ignored, so we set it to 0 */ | |
608 | vc->vt_mode.frsig = 0; | |
8b6312f4 EB |
609 | put_pid(vc->vt_pid); |
610 | vc->vt_pid = get_pid(task_pid(current)); | |
1da177e4 LT |
611 | /* no switch is required -- saw@shade.msu.ru */ |
612 | vc->vt_newvt = -1; | |
ac751efa | 613 | console_unlock(); |
9cc3c22b | 614 | break; |
1da177e4 LT |
615 | } |
616 | ||
617 | case VT_GETMODE: | |
618 | { | |
619 | struct vt_mode tmp; | |
620 | int rc; | |
621 | ||
ac751efa | 622 | console_lock(); |
1da177e4 | 623 | memcpy(&tmp, &vc->vt_mode, sizeof(struct vt_mode)); |
ac751efa | 624 | console_unlock(); |
1da177e4 LT |
625 | |
626 | rc = copy_to_user(up, &tmp, sizeof(struct vt_mode)); | |
9cc3c22b AC |
627 | if (rc) |
628 | ret = -EFAULT; | |
629 | break; | |
1da177e4 LT |
630 | } |
631 | ||
632 | /* | |
633 | * Returns global vt state. Note that VT 0 is always open, since | |
634 | * it's an alias for the current VT, and people can't use it here. | |
635 | * We cannot return state for more than 16 VTs, since v_state is short. | |
636 | */ | |
637 | case VT_GETSTATE: | |
638 | { | |
639 | struct vt_stat __user *vtstat = up; | |
640 | unsigned short state, mask; | |
641 | ||
4001d7b7 | 642 | /* Review: FIXME: Console lock ? */ |
1da177e4 | 643 | if (put_user(fg_console + 1, &vtstat->v_active)) |
9cc3c22b AC |
644 | ret = -EFAULT; |
645 | else { | |
646 | state = 1; /* /dev/tty0 is always open */ | |
647 | for (i = 0, mask = 2; i < MAX_NR_CONSOLES && mask; | |
648 | ++i, mask <<= 1) | |
649 | if (VT_IS_IN_USE(i)) | |
650 | state |= mask; | |
651 | ret = put_user(state, &vtstat->v_state); | |
652 | } | |
653 | break; | |
1da177e4 LT |
654 | } |
655 | ||
656 | /* | |
657 | * Returns the first available (non-opened) console. | |
658 | */ | |
659 | case VT_OPENQRY: | |
4001d7b7 | 660 | /* FIXME: locking ? - but then this is a stupid API */ |
1da177e4 LT |
661 | for (i = 0; i < MAX_NR_CONSOLES; ++i) |
662 | if (! VT_IS_IN_USE(i)) | |
663 | break; | |
1e0ad288 | 664 | uival = i < MAX_NR_CONSOLES ? (i+1) : -1; |
1da177e4 LT |
665 | goto setint; |
666 | ||
667 | /* | |
668 | * ioctl(fd, VT_ACTIVATE, num) will cause us to switch to vt # num, | |
669 | * with num >= 1 (switches to vt 0, our console, are not allowed, just | |
670 | * to preserve sanity). | |
671 | */ | |
672 | case VT_ACTIVATE: | |
673 | if (!perm) | |
4001d7b7 | 674 | return -EPERM; |
1da177e4 | 675 | if (arg == 0 || arg > MAX_NR_CONSOLES) |
9cc3c22b AC |
676 | ret = -ENXIO; |
677 | else { | |
678 | arg--; | |
ac751efa | 679 | console_lock(); |
9cc3c22b | 680 | ret = vc_allocate(arg); |
ac751efa | 681 | console_unlock(); |
9cc3c22b AC |
682 | if (ret) |
683 | break; | |
684 | set_console(arg); | |
685 | } | |
686 | break; | |
1da177e4 | 687 | |
d3b5cffc AC |
688 | case VT_SETACTIVATE: |
689 | { | |
690 | struct vt_setactivate vsa; | |
691 | ||
692 | if (!perm) | |
4001d7b7 | 693 | return -EPERM; |
d3b5cffc AC |
694 | |
695 | if (copy_from_user(&vsa, (struct vt_setactivate __user *)arg, | |
a09efb07 JS |
696 | sizeof(struct vt_setactivate))) { |
697 | ret = -EFAULT; | |
698 | goto out; | |
699 | } | |
d3b5cffc AC |
700 | if (vsa.console == 0 || vsa.console > MAX_NR_CONSOLES) |
701 | ret = -ENXIO; | |
702 | else { | |
703 | vsa.console--; | |
ac751efa | 704 | console_lock(); |
d3b5cffc AC |
705 | ret = vc_allocate(vsa.console); |
706 | if (ret == 0) { | |
707 | struct vc_data *nvc; | |
708 | /* This is safe providing we don't drop the | |
709 | console sem between vc_allocate and | |
710 | finishing referencing nvc */ | |
711 | nvc = vc_cons[vsa.console].d; | |
712 | nvc->vt_mode = vsa.mode; | |
713 | nvc->vt_mode.frsig = 0; | |
714 | put_pid(nvc->vt_pid); | |
715 | nvc->vt_pid = get_pid(task_pid(current)); | |
716 | } | |
ac751efa | 717 | console_unlock(); |
d3b5cffc AC |
718 | if (ret) |
719 | break; | |
720 | /* Commence switch and lock */ | |
4001d7b7 | 721 | /* Review set_console locks */ |
d6378375 | 722 | set_console(vsa.console); |
d3b5cffc | 723 | } |
d6378375 | 724 | break; |
d3b5cffc AC |
725 | } |
726 | ||
1da177e4 LT |
727 | /* |
728 | * wait until the specified VT has been activated | |
729 | */ | |
730 | case VT_WAITACTIVE: | |
731 | if (!perm) | |
4001d7b7 | 732 | return -EPERM; |
1da177e4 | 733 | if (arg == 0 || arg > MAX_NR_CONSOLES) |
9cc3c22b | 734 | ret = -ENXIO; |
99cceb4e | 735 | else |
8b92e87d | 736 | ret = vt_waitactive(arg); |
9cc3c22b | 737 | break; |
1da177e4 LT |
738 | |
739 | /* | |
740 | * If a vt is under process control, the kernel will not switch to it | |
741 | * immediately, but postpone the operation until the process calls this | |
742 | * ioctl, allowing the switch to complete. | |
743 | * | |
744 | * According to the X sources this is the behavior: | |
745 | * 0: pending switch-from not OK | |
746 | * 1: pending switch-from OK | |
747 | * 2: completed switch-to OK | |
748 | */ | |
749 | case VT_RELDISP: | |
750 | if (!perm) | |
4001d7b7 | 751 | return -EPERM; |
1da177e4 | 752 | |
4001d7b7 | 753 | console_lock(); |
9cc3c22b | 754 | if (vc->vt_mode.mode != VT_PROCESS) { |
4001d7b7 | 755 | console_unlock(); |
9cc3c22b AC |
756 | ret = -EINVAL; |
757 | break; | |
758 | } | |
1da177e4 LT |
759 | /* |
760 | * Switching-from response | |
761 | */ | |
762 | if (vc->vt_newvt >= 0) { | |
763 | if (arg == 0) | |
764 | /* | |
765 | * Switch disallowed, so forget we were trying | |
766 | * to do it. | |
767 | */ | |
768 | vc->vt_newvt = -1; | |
769 | ||
770 | else { | |
771 | /* | |
772 | * The current vt has been released, so | |
773 | * complete the switch. | |
774 | */ | |
775 | int newvt; | |
1da177e4 LT |
776 | newvt = vc->vt_newvt; |
777 | vc->vt_newvt = -1; | |
9cc3c22b AC |
778 | ret = vc_allocate(newvt); |
779 | if (ret) { | |
ac751efa | 780 | console_unlock(); |
9cc3c22b | 781 | break; |
1da177e4 LT |
782 | } |
783 | /* | |
784 | * When we actually do the console switch, | |
785 | * make sure we are atomic with respect to | |
786 | * other console switches.. | |
787 | */ | |
788 | complete_change_console(vc_cons[newvt].d); | |
1da177e4 | 789 | } |
9cc3c22b AC |
790 | } else { |
791 | /* | |
792 | * Switched-to response | |
793 | */ | |
1da177e4 LT |
794 | /* |
795 | * If it's just an ACK, ignore it | |
796 | */ | |
9cc3c22b AC |
797 | if (arg != VT_ACKACQ) |
798 | ret = -EINVAL; | |
1da177e4 | 799 | } |
ac751efa | 800 | console_unlock(); |
9cc3c22b | 801 | break; |
1da177e4 LT |
802 | |
803 | /* | |
804 | * Disallocate memory associated to VT (but leave VT1) | |
805 | */ | |
806 | case VT_DISALLOCATE: | |
9cc3c22b AC |
807 | if (arg > MAX_NR_CONSOLES) { |
808 | ret = -ENXIO; | |
809 | break; | |
810 | } | |
421b40a6 PH |
811 | if (arg == 0) |
812 | vt_disallocate_all(); | |
813 | else | |
814 | ret = vt_disallocate(--arg); | |
9cc3c22b | 815 | break; |
1da177e4 LT |
816 | |
817 | case VT_RESIZE: | |
818 | { | |
819 | struct vt_sizes __user *vtsizes = up; | |
e400b6ec AD |
820 | struct vc_data *vc; |
821 | ||
1da177e4 LT |
822 | ushort ll,cc; |
823 | if (!perm) | |
4001d7b7 | 824 | return -EPERM; |
1da177e4 LT |
825 | if (get_user(ll, &vtsizes->v_rows) || |
826 | get_user(cc, &vtsizes->v_cols)) | |
9cc3c22b AC |
827 | ret = -EFAULT; |
828 | else { | |
ac751efa | 829 | console_lock(); |
9cc3c22b AC |
830 | for (i = 0; i < MAX_NR_CONSOLES; i++) { |
831 | vc = vc_cons[i].d; | |
e400b6ec | 832 | |
9cc3c22b AC |
833 | if (vc) { |
834 | vc->vc_resize_user = 1; | |
4001d7b7 | 835 | /* FIXME: review v tty lock */ |
8c9a9dd0 | 836 | vc_resize(vc_cons[i].d, cc, ll); |
9cc3c22b | 837 | } |
e400b6ec | 838 | } |
ac751efa | 839 | console_unlock(); |
e400b6ec | 840 | } |
9cc3c22b | 841 | break; |
1da177e4 LT |
842 | } |
843 | ||
844 | case VT_RESIZEX: | |
845 | { | |
846 | struct vt_consize __user *vtconsize = up; | |
847 | ushort ll,cc,vlin,clin,vcol,ccol; | |
848 | if (!perm) | |
4001d7b7 | 849 | return -EPERM; |
1da177e4 | 850 | if (!access_ok(VERIFY_READ, vtconsize, |
9cc3c22b AC |
851 | sizeof(struct vt_consize))) { |
852 | ret = -EFAULT; | |
853 | break; | |
854 | } | |
855 | /* FIXME: Should check the copies properly */ | |
1da177e4 LT |
856 | __get_user(ll, &vtconsize->v_rows); |
857 | __get_user(cc, &vtconsize->v_cols); | |
858 | __get_user(vlin, &vtconsize->v_vlin); | |
859 | __get_user(clin, &vtconsize->v_clin); | |
860 | __get_user(vcol, &vtconsize->v_vcol); | |
861 | __get_user(ccol, &vtconsize->v_ccol); | |
862 | vlin = vlin ? vlin : vc->vc_scan_lines; | |
863 | if (clin) { | |
864 | if (ll) { | |
9cc3c22b AC |
865 | if (ll != vlin/clin) { |
866 | /* Parameters don't add up */ | |
867 | ret = -EINVAL; | |
868 | break; | |
869 | } | |
1da177e4 LT |
870 | } else |
871 | ll = vlin/clin; | |
872 | } | |
873 | if (vcol && ccol) { | |
874 | if (cc) { | |
9cc3c22b AC |
875 | if (cc != vcol/ccol) { |
876 | ret = -EINVAL; | |
877 | break; | |
878 | } | |
1da177e4 LT |
879 | } else |
880 | cc = vcol/ccol; | |
881 | } | |
882 | ||
9cc3c22b AC |
883 | if (clin > 32) { |
884 | ret = -EINVAL; | |
885 | break; | |
886 | } | |
1da177e4 LT |
887 | |
888 | for (i = 0; i < MAX_NR_CONSOLES; i++) { | |
889 | if (!vc_cons[i].d) | |
890 | continue; | |
ac751efa | 891 | console_lock(); |
1da177e4 LT |
892 | if (vlin) |
893 | vc_cons[i].d->vc_scan_lines = vlin; | |
894 | if (clin) | |
895 | vc_cons[i].d->vc_font.height = clin; | |
e400b6ec | 896 | vc_cons[i].d->vc_resize_user = 1; |
1da177e4 | 897 | vc_resize(vc_cons[i].d, cc, ll); |
ac751efa | 898 | console_unlock(); |
1da177e4 | 899 | } |
9cc3c22b | 900 | break; |
1da177e4 LT |
901 | } |
902 | ||
903 | case PIO_FONT: { | |
904 | if (!perm) | |
4001d7b7 | 905 | return -EPERM; |
1da177e4 LT |
906 | op.op = KD_FONT_OP_SET; |
907 | op.flags = KD_FONT_FLAG_OLD | KD_FONT_FLAG_DONT_RECALC; /* Compatibility */ | |
908 | op.width = 8; | |
909 | op.height = 0; | |
910 | op.charcount = 256; | |
911 | op.data = up; | |
9cc3c22b AC |
912 | ret = con_font_op(vc_cons[fg_console].d, &op); |
913 | break; | |
1da177e4 LT |
914 | } |
915 | ||
916 | case GIO_FONT: { | |
917 | op.op = KD_FONT_OP_GET; | |
918 | op.flags = KD_FONT_FLAG_OLD; | |
919 | op.width = 8; | |
920 | op.height = 32; | |
921 | op.charcount = 256; | |
922 | op.data = up; | |
9cc3c22b AC |
923 | ret = con_font_op(vc_cons[fg_console].d, &op); |
924 | break; | |
1da177e4 LT |
925 | } |
926 | ||
927 | case PIO_CMAP: | |
928 | if (!perm) | |
9cc3c22b AC |
929 | ret = -EPERM; |
930 | else | |
931 | ret = con_set_cmap(up); | |
932 | break; | |
1da177e4 LT |
933 | |
934 | case GIO_CMAP: | |
9cc3c22b AC |
935 | ret = con_get_cmap(up); |
936 | break; | |
1da177e4 LT |
937 | |
938 | case PIO_FONTX: | |
939 | case GIO_FONTX: | |
9cc3c22b AC |
940 | ret = do_fontx_ioctl(cmd, up, perm, &op); |
941 | break; | |
1da177e4 LT |
942 | |
943 | case PIO_FONTRESET: | |
944 | { | |
945 | if (!perm) | |
4001d7b7 | 946 | return -EPERM; |
1da177e4 LT |
947 | |
948 | #ifdef BROKEN_GRAPHICS_PROGRAMS | |
949 | /* With BROKEN_GRAPHICS_PROGRAMS defined, the default | |
950 | font is not saved. */ | |
9cc3c22b AC |
951 | ret = -ENOSYS; |
952 | break; | |
1da177e4 LT |
953 | #else |
954 | { | |
955 | op.op = KD_FONT_OP_SET_DEFAULT; | |
956 | op.data = NULL; | |
9cc3c22b AC |
957 | ret = con_font_op(vc_cons[fg_console].d, &op); |
958 | if (ret) | |
959 | break; | |
5d1a33fa | 960 | console_lock(); |
1da177e4 | 961 | con_set_default_unimap(vc_cons[fg_console].d); |
5d1a33fa | 962 | console_unlock(); |
9cc3c22b | 963 | break; |
1da177e4 LT |
964 | } |
965 | #endif | |
966 | } | |
967 | ||
968 | case KDFONTOP: { | |
9cc3c22b AC |
969 | if (copy_from_user(&op, up, sizeof(op))) { |
970 | ret = -EFAULT; | |
971 | break; | |
972 | } | |
1da177e4 | 973 | if (!perm && op.op != KD_FONT_OP_GET) |
4001d7b7 | 974 | return -EPERM; |
9cc3c22b AC |
975 | ret = con_font_op(vc, &op); |
976 | if (ret) | |
977 | break; | |
1da177e4 | 978 | if (copy_to_user(up, &op, sizeof(op))) |
9cc3c22b AC |
979 | ret = -EFAULT; |
980 | break; | |
1da177e4 LT |
981 | } |
982 | ||
983 | case PIO_SCRNMAP: | |
984 | if (!perm) | |
9cc3c22b | 985 | ret = -EPERM; |
5d1a33fa | 986 | else |
9cc3c22b AC |
987 | ret = con_set_trans_old(up); |
988 | break; | |
1da177e4 LT |
989 | |
990 | case GIO_SCRNMAP: | |
9cc3c22b AC |
991 | ret = con_get_trans_old(up); |
992 | break; | |
1da177e4 LT |
993 | |
994 | case PIO_UNISCRNMAP: | |
995 | if (!perm) | |
9cc3c22b | 996 | ret = -EPERM; |
5d1a33fa | 997 | else |
9cc3c22b AC |
998 | ret = con_set_trans_new(up); |
999 | break; | |
1da177e4 LT |
1000 | |
1001 | case GIO_UNISCRNMAP: | |
9cc3c22b AC |
1002 | ret = con_get_trans_new(up); |
1003 | break; | |
1da177e4 LT |
1004 | |
1005 | case PIO_UNIMAPCLR: | |
1da177e4 | 1006 | if (!perm) |
4001d7b7 | 1007 | return -EPERM; |
f8b0c2e6 | 1008 | con_clear_unimap(vc); |
9cc3c22b | 1009 | break; |
1da177e4 LT |
1010 | |
1011 | case PIO_UNIMAP: | |
1012 | case GIO_UNIMAP: | |
9cc3c22b AC |
1013 | ret = do_unimap_ioctl(cmd, up, perm, vc); |
1014 | break; | |
1da177e4 LT |
1015 | |
1016 | case VT_LOCKSWITCH: | |
1017 | if (!capable(CAP_SYS_TTY_CONFIG)) | |
4001d7b7 | 1018 | return -EPERM; |
1da177e4 | 1019 | vt_dont_switch = 1; |
9cc3c22b | 1020 | break; |
1da177e4 LT |
1021 | case VT_UNLOCKSWITCH: |
1022 | if (!capable(CAP_SYS_TTY_CONFIG)) | |
4001d7b7 | 1023 | return -EPERM; |
1da177e4 | 1024 | vt_dont_switch = 0; |
9cc3c22b | 1025 | break; |
533475d3 | 1026 | case VT_GETHIFONTMASK: |
9cc3c22b AC |
1027 | ret = put_user(vc->vc_hi_font_mask, |
1028 | (unsigned short __user *)arg); | |
1029 | break; | |
8b92e87d AC |
1030 | case VT_WAITEVENT: |
1031 | ret = vt_event_wait_ioctl((struct vt_event __user *)arg); | |
1032 | break; | |
1da177e4 | 1033 | default: |
9cc3c22b | 1034 | ret = -ENOIOCTLCMD; |
1da177e4 | 1035 | } |
9cc3c22b | 1036 | out: |
9cc3c22b | 1037 | return ret; |
1da177e4 LT |
1038 | } |
1039 | ||
1da177e4 LT |
1040 | void reset_vc(struct vc_data *vc) |
1041 | { | |
1042 | vc->vc_mode = KD_TEXT; | |
079c9534 | 1043 | vt_reset_unicode(vc->vc_num); |
1da177e4 LT |
1044 | vc->vt_mode.mode = VT_AUTO; |
1045 | vc->vt_mode.waitv = 0; | |
1046 | vc->vt_mode.relsig = 0; | |
1047 | vc->vt_mode.acqsig = 0; | |
1048 | vc->vt_mode.frsig = 0; | |
8b6312f4 EB |
1049 | put_pid(vc->vt_pid); |
1050 | vc->vt_pid = NULL; | |
1da177e4 LT |
1051 | vc->vt_newvt = -1; |
1052 | if (!in_interrupt()) /* Via keyboard.c:SAK() - akpm */ | |
1053 | reset_palette(vc); | |
1054 | } | |
1055 | ||
8b6312f4 EB |
1056 | void vc_SAK(struct work_struct *work) |
1057 | { | |
1058 | struct vc *vc_con = | |
1059 | container_of(work, struct vc, SAK_work); | |
1060 | struct vc_data *vc; | |
1061 | struct tty_struct *tty; | |
1062 | ||
ac751efa | 1063 | console_lock(); |
8b6312f4 EB |
1064 | vc = vc_con->d; |
1065 | if (vc) { | |
079c9534 | 1066 | /* FIXME: review tty ref counting */ |
8ce73264 | 1067 | tty = vc->port.tty; |
8b6312f4 EB |
1068 | /* |
1069 | * SAK should also work in all raw modes and reset | |
1070 | * them properly. | |
1071 | */ | |
1072 | if (tty) | |
1073 | __do_SAK(tty); | |
1074 | reset_vc(vc); | |
1075 | } | |
ac751efa | 1076 | console_unlock(); |
8b6312f4 EB |
1077 | } |
1078 | ||
e9216651 AB |
1079 | #ifdef CONFIG_COMPAT |
1080 | ||
1081 | struct compat_consolefontdesc { | |
1082 | unsigned short charcount; /* characters in font (256 or 512) */ | |
1083 | unsigned short charheight; /* scan lines per character (1-32) */ | |
1084 | compat_caddr_t chardata; /* font data in expanded form */ | |
1085 | }; | |
1086 | ||
1087 | static inline int | |
1088 | compat_fontx_ioctl(int cmd, struct compat_consolefontdesc __user *user_cfd, | |
1089 | int perm, struct console_font_op *op) | |
1090 | { | |
1091 | struct compat_consolefontdesc cfdarg; | |
1092 | int i; | |
1093 | ||
1094 | if (copy_from_user(&cfdarg, user_cfd, sizeof(struct compat_consolefontdesc))) | |
1095 | return -EFAULT; | |
1096 | ||
1097 | switch (cmd) { | |
1098 | case PIO_FONTX: | |
1099 | if (!perm) | |
1100 | return -EPERM; | |
1101 | op->op = KD_FONT_OP_SET; | |
1102 | op->flags = KD_FONT_FLAG_OLD; | |
1103 | op->width = 8; | |
1104 | op->height = cfdarg.charheight; | |
1105 | op->charcount = cfdarg.charcount; | |
1106 | op->data = compat_ptr(cfdarg.chardata); | |
1107 | return con_font_op(vc_cons[fg_console].d, op); | |
1108 | case GIO_FONTX: | |
1109 | op->op = KD_FONT_OP_GET; | |
1110 | op->flags = KD_FONT_FLAG_OLD; | |
1111 | op->width = 8; | |
1112 | op->height = cfdarg.charheight; | |
1113 | op->charcount = cfdarg.charcount; | |
1114 | op->data = compat_ptr(cfdarg.chardata); | |
1115 | i = con_font_op(vc_cons[fg_console].d, op); | |
1116 | if (i) | |
1117 | return i; | |
1118 | cfdarg.charheight = op->height; | |
1119 | cfdarg.charcount = op->charcount; | |
1120 | if (copy_to_user(user_cfd, &cfdarg, sizeof(struct compat_consolefontdesc))) | |
1121 | return -EFAULT; | |
1122 | return 0; | |
1123 | } | |
1124 | return -EINVAL; | |
1125 | } | |
1126 | ||
1127 | struct compat_console_font_op { | |
1128 | compat_uint_t op; /* operation code KD_FONT_OP_* */ | |
1129 | compat_uint_t flags; /* KD_FONT_FLAG_* */ | |
1130 | compat_uint_t width, height; /* font size */ | |
1131 | compat_uint_t charcount; | |
1132 | compat_caddr_t data; /* font data with height fixed to 32 */ | |
1133 | }; | |
1134 | ||
1135 | static inline int | |
1136 | compat_kdfontop_ioctl(struct compat_console_font_op __user *fontop, | |
1137 | int perm, struct console_font_op *op, struct vc_data *vc) | |
1138 | { | |
1139 | int i; | |
1140 | ||
1141 | if (copy_from_user(op, fontop, sizeof(struct compat_console_font_op))) | |
1142 | return -EFAULT; | |
1143 | if (!perm && op->op != KD_FONT_OP_GET) | |
1144 | return -EPERM; | |
1145 | op->data = compat_ptr(((struct compat_console_font_op *)op)->data); | |
e9216651 AB |
1146 | i = con_font_op(vc, op); |
1147 | if (i) | |
1148 | return i; | |
1149 | ((struct compat_console_font_op *)op)->data = (unsigned long)op->data; | |
1150 | if (copy_to_user(fontop, op, sizeof(struct compat_console_font_op))) | |
1151 | return -EFAULT; | |
1152 | return 0; | |
1153 | } | |
1154 | ||
1155 | struct compat_unimapdesc { | |
1156 | unsigned short entry_ct; | |
1157 | compat_caddr_t entries; | |
1158 | }; | |
1159 | ||
1160 | static inline int | |
1161 | compat_unimap_ioctl(unsigned int cmd, struct compat_unimapdesc __user *user_ud, | |
1162 | int perm, struct vc_data *vc) | |
1163 | { | |
1164 | struct compat_unimapdesc tmp; | |
1165 | struct unipair __user *tmp_entries; | |
1166 | ||
1167 | if (copy_from_user(&tmp, user_ud, sizeof tmp)) | |
1168 | return -EFAULT; | |
1169 | tmp_entries = compat_ptr(tmp.entries); | |
e9216651 AB |
1170 | switch (cmd) { |
1171 | case PIO_UNIMAP: | |
1172 | if (!perm) | |
1173 | return -EPERM; | |
1174 | return con_set_unimap(vc, tmp.entry_ct, tmp_entries); | |
1175 | case GIO_UNIMAP: | |
1176 | if (!perm && fg_console != vc->vc_num) | |
1177 | return -EPERM; | |
1178 | return con_get_unimap(vc, tmp.entry_ct, &(user_ud->entry_ct), tmp_entries); | |
1179 | } | |
1180 | return 0; | |
1181 | } | |
1182 | ||
6caa76b7 | 1183 | long vt_compat_ioctl(struct tty_struct *tty, |
e9216651 AB |
1184 | unsigned int cmd, unsigned long arg) |
1185 | { | |
1186 | struct vc_data *vc = tty->driver_data; | |
1187 | struct console_font_op op; /* used in multiple places here */ | |
e9216651 AB |
1188 | unsigned int console; |
1189 | void __user *up = (void __user *)arg; | |
1190 | int perm; | |
1191 | int ret = 0; | |
1192 | ||
1193 | console = vc->vc_num; | |
1194 | ||
e9216651 AB |
1195 | if (!vc_cons_allocated(console)) { /* impossible? */ |
1196 | ret = -ENOIOCTLCMD; | |
1197 | goto out; | |
1198 | } | |
1199 | ||
1200 | /* | |
1201 | * To have permissions to do most of the vt ioctls, we either have | |
1202 | * to be the owner of the tty, or have CAP_SYS_TTY_CONFIG. | |
1203 | */ | |
1204 | perm = 0; | |
1205 | if (current->signal->tty == tty || capable(CAP_SYS_TTY_CONFIG)) | |
1206 | perm = 1; | |
1207 | ||
e9216651 AB |
1208 | switch (cmd) { |
1209 | /* | |
1210 | * these need special handlers for incompatible data structures | |
1211 | */ | |
1212 | case PIO_FONTX: | |
1213 | case GIO_FONTX: | |
1214 | ret = compat_fontx_ioctl(cmd, up, perm, &op); | |
1215 | break; | |
1216 | ||
1217 | case KDFONTOP: | |
1218 | ret = compat_kdfontop_ioctl(up, perm, &op, vc); | |
1219 | break; | |
1220 | ||
1221 | case PIO_UNIMAP: | |
1222 | case GIO_UNIMAP: | |
4b1fe779 | 1223 | ret = compat_unimap_ioctl(cmd, up, perm, vc); |
e9216651 AB |
1224 | break; |
1225 | ||
1226 | /* | |
1227 | * all these treat 'arg' as an integer | |
1228 | */ | |
1229 | case KIOCSOUND: | |
1230 | case KDMKTONE: | |
1231 | #ifdef CONFIG_X86 | |
1232 | case KDADDIO: | |
1233 | case KDDELIO: | |
1234 | #endif | |
1235 | case KDSETMODE: | |
1236 | case KDMAPDISP: | |
1237 | case KDUNMAPDISP: | |
1238 | case KDSKBMODE: | |
1239 | case KDSKBMETA: | |
1240 | case KDSKBLED: | |
1241 | case KDSETLED: | |
1242 | case KDSIGACCEPT: | |
1243 | case VT_ACTIVATE: | |
1244 | case VT_WAITACTIVE: | |
1245 | case VT_RELDISP: | |
1246 | case VT_DISALLOCATE: | |
1247 | case VT_RESIZE: | |
1248 | case VT_RESIZEX: | |
1249 | goto fallback; | |
1250 | ||
1251 | /* | |
1252 | * the rest has a compatible data structure behind arg, | |
1253 | * but we have to convert it to a proper 64 bit pointer. | |
1254 | */ | |
1255 | default: | |
1256 | arg = (unsigned long)compat_ptr(arg); | |
1257 | goto fallback; | |
1258 | } | |
1259 | out: | |
e9216651 AB |
1260 | return ret; |
1261 | ||
1262 | fallback: | |
6caa76b7 | 1263 | return vt_ioctl(tty, cmd, arg); |
e9216651 AB |
1264 | } |
1265 | ||
1266 | ||
1267 | #endif /* CONFIG_COMPAT */ | |
1268 | ||
1269 | ||
1da177e4 | 1270 | /* |
d3b5cffc AC |
1271 | * Performs the back end of a vt switch. Called under the console |
1272 | * semaphore. | |
1da177e4 LT |
1273 | */ |
1274 | static void complete_change_console(struct vc_data *vc) | |
1275 | { | |
1276 | unsigned char old_vc_mode; | |
8b92e87d | 1277 | int old = fg_console; |
1da177e4 LT |
1278 | |
1279 | last_console = fg_console; | |
1280 | ||
1281 | /* | |
1282 | * If we're switching, we could be going from KD_GRAPHICS to | |
1283 | * KD_TEXT mode or vice versa, which means we need to blank or | |
1284 | * unblank the screen later. | |
1285 | */ | |
1286 | old_vc_mode = vc_cons[fg_console].d->vc_mode; | |
1287 | switch_screen(vc); | |
1288 | ||
1289 | /* | |
3dfcaf16 | 1290 | * This can't appear below a successful kill_pid(). If it did, |
1da177e4 LT |
1291 | * then the *blank_screen operation could occur while X, having |
1292 | * received acqsig, is waking up on another processor. This | |
1293 | * condition can lead to overlapping accesses to the VGA range | |
1294 | * and the framebuffer (causing system lockups). | |
1295 | * | |
1296 | * To account for this we duplicate this code below only if the | |
1297 | * controlling process is gone and we've called reset_vc. | |
1298 | */ | |
1299 | if (old_vc_mode != vc->vc_mode) { | |
1300 | if (vc->vc_mode == KD_TEXT) | |
1301 | do_unblank_screen(1); | |
1302 | else | |
1303 | do_blank_screen(1); | |
1304 | } | |
1305 | ||
1306 | /* | |
1307 | * If this new console is under process control, send it a signal | |
1308 | * telling it that it has acquired. Also check if it has died and | |
1309 | * clean up (similar to logic employed in change_console()) | |
1310 | */ | |
87a6aca5 | 1311 | if (vc->vt_mode.mode == VT_PROCESS) { |
1da177e4 | 1312 | /* |
3dfcaf16 | 1313 | * Send the signal as privileged - kill_pid() will |
1da177e4 LT |
1314 | * tell us if the process has gone or something else |
1315 | * is awry | |
1316 | */ | |
bde0d2c9 | 1317 | if (kill_pid(vc->vt_pid, vc->vt_mode.acqsig, 1) != 0) { |
1da177e4 LT |
1318 | /* |
1319 | * The controlling process has died, so we revert back to | |
1320 | * normal operation. In this case, we'll also change back | |
1321 | * to KD_TEXT mode. I'm not sure if this is strictly correct | |
1322 | * but it saves the agony when the X server dies and the screen | |
1323 | * remains blanked due to KD_GRAPHICS! It would be nice to do | |
1324 | * this outside of VT_PROCESS but there is no single process | |
1325 | * to account for and tracking tty count may be undesirable. | |
1326 | */ | |
1327 | reset_vc(vc); | |
1328 | ||
1329 | if (old_vc_mode != vc->vc_mode) { | |
1330 | if (vc->vc_mode == KD_TEXT) | |
1331 | do_unblank_screen(1); | |
1332 | else | |
1333 | do_blank_screen(1); | |
1334 | } | |
1335 | } | |
1336 | } | |
1337 | ||
1338 | /* | |
1339 | * Wake anyone waiting for their VT to activate | |
1340 | */ | |
8b92e87d | 1341 | vt_event_post(VT_EVENT_SWITCH, old, vc->vc_num); |
1da177e4 LT |
1342 | return; |
1343 | } | |
1344 | ||
1345 | /* | |
1346 | * Performs the front-end of a vt switch | |
1347 | */ | |
1348 | void change_console(struct vc_data *new_vc) | |
1349 | { | |
1350 | struct vc_data *vc; | |
1351 | ||
1352 | if (!new_vc || new_vc->vc_num == fg_console || vt_dont_switch) | |
1353 | return; | |
1354 | ||
1355 | /* | |
1356 | * If this vt is in process mode, then we need to handshake with | |
1357 | * that process before switching. Essentially, we store where that | |
1358 | * vt wants to switch to and wait for it to tell us when it's done | |
1359 | * (via VT_RELDISP ioctl). | |
1360 | * | |
1361 | * We also check to see if the controlling process still exists. | |
1362 | * If it doesn't, we reset this vt to auto mode and continue. | |
1363 | * This is a cheap way to track process control. The worst thing | |
1364 | * that can happen is: we send a signal to a process, it dies, and | |
1365 | * the switch gets "lost" waiting for a response; hopefully, the | |
1366 | * user will try again, we'll detect the process is gone (unless | |
1367 | * the user waits just the right amount of time :-) and revert the | |
1368 | * vt to auto control. | |
1369 | */ | |
1370 | vc = vc_cons[fg_console].d; | |
87a6aca5 | 1371 | if (vc->vt_mode.mode == VT_PROCESS) { |
1da177e4 | 1372 | /* |
3dfcaf16 | 1373 | * Send the signal as privileged - kill_pid() will |
1da177e4 | 1374 | * tell us if the process has gone or something else |
a64314e6 JL |
1375 | * is awry. |
1376 | * | |
1377 | * We need to set vt_newvt *before* sending the signal or we | |
1378 | * have a race. | |
1da177e4 | 1379 | */ |
a64314e6 | 1380 | vc->vt_newvt = new_vc->vc_num; |
bde0d2c9 | 1381 | if (kill_pid(vc->vt_pid, vc->vt_mode.relsig, 1) == 0) { |
1da177e4 | 1382 | /* |
87a6aca5 GKH |
1383 | * It worked. Mark the vt to switch to and |
1384 | * return. The process needs to send us a | |
1385 | * VT_RELDISP ioctl to complete the switch. | |
1da177e4 | 1386 | */ |
87a6aca5 | 1387 | return; |
1da177e4 LT |
1388 | } |
1389 | ||
1390 | /* | |
87a6aca5 GKH |
1391 | * The controlling process has died, so we revert back to |
1392 | * normal operation. In this case, we'll also change back | |
1393 | * to KD_TEXT mode. I'm not sure if this is strictly correct | |
1394 | * but it saves the agony when the X server dies and the screen | |
1395 | * remains blanked due to KD_GRAPHICS! It would be nice to do | |
1396 | * this outside of VT_PROCESS but there is no single process | |
1397 | * to account for and tracking tty count may be undesirable. | |
1398 | */ | |
1399 | reset_vc(vc); | |
1400 | ||
1401 | /* | |
1402 | * Fall through to normal (VT_AUTO) handling of the switch... | |
1da177e4 LT |
1403 | */ |
1404 | } | |
1405 | ||
1406 | /* | |
1407 | * Ignore all switches in KD_GRAPHICS+VT_AUTO mode | |
1408 | */ | |
1409 | if (vc->vc_mode == KD_GRAPHICS) | |
1410 | return; | |
1411 | ||
1412 | complete_change_console(new_vc); | |
1413 | } | |
8d233558 AC |
1414 | |
1415 | /* Perform a kernel triggered VT switch for suspend/resume */ | |
1416 | ||
1417 | static int disable_vt_switch; | |
1418 | ||
1419 | int vt_move_to_console(unsigned int vt, int alloc) | |
1420 | { | |
1421 | int prev; | |
1422 | ||
ac751efa | 1423 | console_lock(); |
8d233558 AC |
1424 | /* Graphics mode - up to X */ |
1425 | if (disable_vt_switch) { | |
ac751efa | 1426 | console_unlock(); |
8d233558 AC |
1427 | return 0; |
1428 | } | |
1429 | prev = fg_console; | |
1430 | ||
1431 | if (alloc && vc_allocate(vt)) { | |
1432 | /* we can't have a free VC for now. Too bad, | |
1433 | * we don't want to mess the screen for now. */ | |
ac751efa | 1434 | console_unlock(); |
8d233558 AC |
1435 | return -ENOSPC; |
1436 | } | |
1437 | ||
1438 | if (set_console(vt)) { | |
1439 | /* | |
1440 | * We're unable to switch to the SUSPEND_CONSOLE. | |
1441 | * Let the calling function know so it can decide | |
1442 | * what to do. | |
1443 | */ | |
ac751efa | 1444 | console_unlock(); |
8d233558 AC |
1445 | return -EIO; |
1446 | } | |
ac751efa | 1447 | console_unlock(); |
797938b5 | 1448 | if (vt_waitactive(vt + 1)) { |
8d233558 AC |
1449 | pr_debug("Suspend: Can't switch VCs."); |
1450 | return -EINTR; | |
1451 | } | |
1452 | return prev; | |
1453 | } | |
1454 | ||
1455 | /* | |
1456 | * Normally during a suspend, we allocate a new console and switch to it. | |
1457 | * When we resume, we switch back to the original console. This switch | |
1458 | * can be slow, so on systems where the framebuffer can handle restoration | |
1459 | * of video registers anyways, there's little point in doing the console | |
1460 | * switch. This function allows you to disable it by passing it '0'. | |
1461 | */ | |
1462 | void pm_set_vt_switch(int do_switch) | |
1463 | { | |
ac751efa | 1464 | console_lock(); |
8d233558 | 1465 | disable_vt_switch = !do_switch; |
ac751efa | 1466 | console_unlock(); |
8d233558 AC |
1467 | } |
1468 | EXPORT_SYMBOL(pm_set_vt_switch); |