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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 | ||
f400991b | 42 | bool vt_dont_switch; |
1da177e4 | 43 | |
e587e8f1 JS |
44 | static inline bool vt_in_use(unsigned int i) |
45 | { | |
7cf64b18 | 46 | const struct vc_data *vc = vc_cons[i].d; |
e587e8f1 | 47 | |
7cf64b18 EB |
48 | /* |
49 | * console_lock must be held to prevent the vc from being deallocated | |
50 | * while we're checking whether it's in-use. | |
51 | */ | |
52 | WARN_CONSOLE_UNLOCKED(); | |
53 | ||
54 | return vc && kref_read(&vc->port.kref) > 1; | |
e587e8f1 JS |
55 | } |
56 | ||
57 | static inline bool vt_busy(int i) | |
58 | { | |
59 | if (vt_in_use(i)) | |
60 | return true; | |
61 | if (i == fg_console) | |
62 | return true; | |
63 | if (vc_is_sel(vc_cons[i].d)) | |
64 | return true; | |
65 | ||
66 | return false; | |
67 | } | |
1da177e4 LT |
68 | |
69 | /* | |
70 | * Console (vt and kd) routines, as defined by USL SVR4 manual, and by | |
71 | * experimentation and study of X386 SYSV handling. | |
72 | * | |
73 | * One point of difference: SYSV vt's are /dev/vtX, which X >= 0, and | |
74 | * /dev/console is a separate ttyp. Under Linux, /dev/tty0 is /dev/console, | |
75 | * and the vc start at /dev/ttyX, X >= 1. We maintain that here, so we will | |
76 | * always treat our set of vt as numbered 1..MAX_NR_CONSOLES (corresponding to | |
77 | * ttys 0..MAX_NR_CONSOLES-1). Explicitly naming VT 0 is illegal, but using | |
78 | * /dev/tty0 (fg_console) as a target is legal, since an implicit aliasing | |
79 | * to the current console is done by the main ioctl code. | |
80 | */ | |
81 | ||
82 | #ifdef CONFIG_X86 | |
66f4e88c | 83 | #include <asm/syscalls.h> |
1da177e4 LT |
84 | #endif |
85 | ||
86 | static void complete_change_console(struct vc_data *vc); | |
87 | ||
8b92e87d AC |
88 | /* |
89 | * User space VT_EVENT handlers | |
90 | */ | |
91 | ||
92 | struct vt_event_wait { | |
93 | struct list_head list; | |
94 | struct vt_event event; | |
95 | int done; | |
96 | }; | |
97 | ||
98 | static LIST_HEAD(vt_events); | |
99 | static DEFINE_SPINLOCK(vt_event_lock); | |
100 | static DECLARE_WAIT_QUEUE_HEAD(vt_event_waitqueue); | |
101 | ||
102 | /** | |
103 | * vt_event_post | |
104 | * @event: the event that occurred | |
105 | * @old: old console | |
106 | * @new: new console | |
107 | * | |
108 | * Post an VT event to interested VT handlers | |
109 | */ | |
110 | ||
111 | void vt_event_post(unsigned int event, unsigned int old, unsigned int new) | |
112 | { | |
113 | struct list_head *pos, *head; | |
114 | unsigned long flags; | |
115 | int wake = 0; | |
116 | ||
117 | spin_lock_irqsave(&vt_event_lock, flags); | |
118 | head = &vt_events; | |
119 | ||
120 | list_for_each(pos, head) { | |
121 | struct vt_event_wait *ve = list_entry(pos, | |
122 | struct vt_event_wait, list); | |
123 | if (!(ve->event.event & event)) | |
124 | continue; | |
125 | ve->event.event = event; | |
126 | /* kernel view is consoles 0..n-1, user space view is | |
127 | console 1..n with 0 meaning current, so we must bias */ | |
308efab5 AC |
128 | ve->event.oldev = old + 1; |
129 | ve->event.newev = new + 1; | |
8b92e87d AC |
130 | wake = 1; |
131 | ve->done = 1; | |
132 | } | |
133 | spin_unlock_irqrestore(&vt_event_lock, flags); | |
134 | if (wake) | |
135 | wake_up_interruptible(&vt_event_waitqueue); | |
136 | } | |
137 | ||
a7b12929 | 138 | static void __vt_event_queue(struct vt_event_wait *vw) |
8b92e87d AC |
139 | { |
140 | unsigned long flags; | |
141 | /* Prepare the event */ | |
142 | INIT_LIST_HEAD(&vw->list); | |
143 | vw->done = 0; | |
144 | /* Queue our event */ | |
145 | spin_lock_irqsave(&vt_event_lock, flags); | |
146 | list_add(&vw->list, &vt_events); | |
147 | spin_unlock_irqrestore(&vt_event_lock, flags); | |
a7b12929 RV |
148 | } |
149 | ||
150 | static void __vt_event_wait(struct vt_event_wait *vw) | |
151 | { | |
8b92e87d | 152 | /* Wait for it to pass */ |
99cceb4e | 153 | wait_event_interruptible(vt_event_waitqueue, vw->done); |
a7b12929 RV |
154 | } |
155 | ||
156 | static void __vt_event_dequeue(struct vt_event_wait *vw) | |
157 | { | |
158 | unsigned long flags; | |
159 | ||
8b92e87d AC |
160 | /* Dequeue it */ |
161 | spin_lock_irqsave(&vt_event_lock, flags); | |
162 | list_del(&vw->list); | |
163 | spin_unlock_irqrestore(&vt_event_lock, flags); | |
164 | } | |
165 | ||
a7b12929 RV |
166 | /** |
167 | * vt_event_wait - wait for an event | |
168 | * @vw: our event | |
169 | * | |
170 | * Waits for an event to occur which completes our vt_event_wait | |
171 | * structure. On return the structure has wv->done set to 1 for success | |
172 | * or 0 if some event such as a signal ended the wait. | |
173 | */ | |
174 | ||
175 | static void vt_event_wait(struct vt_event_wait *vw) | |
176 | { | |
177 | __vt_event_queue(vw); | |
178 | __vt_event_wait(vw); | |
179 | __vt_event_dequeue(vw); | |
180 | } | |
181 | ||
8b92e87d AC |
182 | /** |
183 | * vt_event_wait_ioctl - event ioctl handler | |
ea239f1e | 184 | * @event: argument to ioctl (the event) |
8b92e87d AC |
185 | * |
186 | * Implement the VT_WAITEVENT ioctl using the VT event interface | |
187 | */ | |
188 | ||
189 | static int vt_event_wait_ioctl(struct vt_event __user *event) | |
190 | { | |
191 | struct vt_event_wait vw; | |
192 | ||
193 | if (copy_from_user(&vw.event, event, sizeof(struct vt_event))) | |
194 | return -EFAULT; | |
195 | /* Highest supported event for now */ | |
196 | if (vw.event.event & ~VT_MAX_EVENT) | |
197 | return -EINVAL; | |
198 | ||
199 | vt_event_wait(&vw); | |
200 | /* If it occurred report it */ | |
201 | if (vw.done) { | |
202 | if (copy_to_user(event, &vw.event, sizeof(struct vt_event))) | |
203 | return -EFAULT; | |
204 | return 0; | |
205 | } | |
206 | return -EINTR; | |
207 | } | |
208 | ||
209 | /** | |
210 | * vt_waitactive - active console wait | |
8b92e87d AC |
211 | * @n: new console |
212 | * | |
213 | * Helper for event waits. Used to implement the legacy | |
214 | * event waiting ioctls in terms of events | |
215 | */ | |
216 | ||
217 | int vt_waitactive(int n) | |
218 | { | |
219 | struct vt_event_wait vw; | |
220 | do { | |
8b92e87d | 221 | vw.event.event = VT_EVENT_SWITCH; |
a7b12929 RV |
222 | __vt_event_queue(&vw); |
223 | if (n == fg_console + 1) { | |
224 | __vt_event_dequeue(&vw); | |
225 | break; | |
226 | } | |
227 | __vt_event_wait(&vw); | |
228 | __vt_event_dequeue(&vw); | |
8b92e87d AC |
229 | if (vw.done == 0) |
230 | return -EINTR; | |
308efab5 | 231 | } while (vw.event.newev != n); |
8b92e87d AC |
232 | return 0; |
233 | } | |
234 | ||
1da177e4 LT |
235 | /* |
236 | * these are the valid i/o ports we're allowed to change. they map all the | |
237 | * video ports | |
238 | */ | |
239 | #define GPFIRST 0x3b4 | |
240 | #define GPLAST 0x3df | |
241 | #define GPNUM (GPLAST - GPFIRST + 1) | |
242 | ||
a4c53c83 JS |
243 | /* |
244 | * currently, setting the mode from KD_TEXT to KD_GRAPHICS doesn't do a whole | |
245 | * lot. i'm not sure if it should do any restoration of modes or what... | |
246 | * | |
247 | * XXX It should at least call into the driver, fbdev's definitely need to | |
248 | * restore their engine state. --BenH | |
2287a51b LT |
249 | * |
250 | * Called with the console lock held. | |
a4c53c83 JS |
251 | */ |
252 | static int vt_kdsetmode(struct vc_data *vc, unsigned long mode) | |
253 | { | |
254 | switch (mode) { | |
255 | case KD_GRAPHICS: | |
256 | break; | |
257 | case KD_TEXT0: | |
258 | case KD_TEXT1: | |
259 | mode = KD_TEXT; | |
260 | fallthrough; | |
261 | case KD_TEXT: | |
262 | break; | |
263 | default: | |
264 | return -EINVAL; | |
265 | } | |
266 | ||
a4c53c83 JS |
267 | if (vc->vc_mode == mode) |
268 | return 0; | |
269 | ||
270 | vc->vc_mode = mode; | |
271 | if (vc->vc_num != fg_console) | |
272 | return 0; | |
273 | ||
274 | /* explicitly blank/unblank the screen if switching modes */ | |
a4c53c83 JS |
275 | if (mode == KD_TEXT) |
276 | do_unblank_screen(1); | |
277 | else | |
278 | do_blank_screen(1); | |
a4c53c83 JS |
279 | |
280 | return 0; | |
281 | } | |
282 | ||
832a62ab JS |
283 | static int vt_k_ioctl(struct tty_struct *tty, unsigned int cmd, |
284 | unsigned long arg, bool perm) | |
1da177e4 | 285 | { |
c9f19e96 | 286 | struct vc_data *vc = tty->driver_data; |
1da177e4 | 287 | void __user *up = (void __user *)arg; |
832a62ab | 288 | unsigned int console = vc->vc_num; |
0ce8179e | 289 | int ret; |
9cc3c22b | 290 | |
1da177e4 LT |
291 | switch (cmd) { |
292 | case KIOCSOUND: | |
293 | if (!perm) | |
4001d7b7 | 294 | return -EPERM; |
2c4e9671 AB |
295 | /* |
296 | * The use of PIT_TICK_RATE is historic, it used to be | |
297 | * the platform-dependent CLOCK_TICK_RATE between 2.6.12 | |
298 | * and 2.6.36, which was a minor but unfortunate ABI | |
4001d7b7 | 299 | * change. kd_mksound is locked by the input layer. |
2c4e9671 | 300 | */ |
1da177e4 | 301 | if (arg) |
2c4e9671 | 302 | arg = PIT_TICK_RATE / arg; |
1da177e4 | 303 | kd_mksound(arg, 0); |
9cc3c22b | 304 | break; |
1da177e4 LT |
305 | |
306 | case KDMKTONE: | |
307 | if (!perm) | |
4001d7b7 | 308 | return -EPERM; |
1da177e4 LT |
309 | { |
310 | unsigned int ticks, count; | |
832a62ab | 311 | |
1da177e4 LT |
312 | /* |
313 | * Generate the tone for the appropriate number of ticks. | |
314 | * If the time is zero, turn off sound ourselves. | |
315 | */ | |
4c0d9b17 | 316 | ticks = msecs_to_jiffies((arg >> 16) & 0xffff); |
1da177e4 LT |
317 | count = ticks ? (arg & 0xffff) : 0; |
318 | if (count) | |
2c4e9671 | 319 | count = PIT_TICK_RATE / count; |
1da177e4 | 320 | kd_mksound(count, ticks); |
9cc3c22b | 321 | break; |
1da177e4 LT |
322 | } |
323 | ||
324 | case KDGKBTYPE: | |
325 | /* | |
4001d7b7 | 326 | * this is naïve. |
1da177e4 | 327 | */ |
eca734d8 | 328 | return put_user(KB_101, (char __user *)arg); |
1da177e4 LT |
329 | |
330 | /* | |
331 | * These cannot be implemented on any machine that implements | |
332 | * ioperm() in user level (such as Alpha PCs) or not at all. | |
333 | * | |
334 | * XXX: you should never use these, just call ioperm directly.. | |
335 | */ | |
336 | #ifdef CONFIG_X86 | |
337 | case KDADDIO: | |
338 | case KDDELIO: | |
339 | /* | |
340 | * KDADDIO and KDDELIO may be able to add ports beyond what | |
341 | * we reject here, but to be safe... | |
4001d7b7 AC |
342 | * |
343 | * These are locked internally via sys_ioperm | |
1da177e4 | 344 | */ |
0ce8179e JS |
345 | if (arg < GPFIRST || arg > GPLAST) |
346 | return -EINVAL; | |
347 | ||
348 | return ksys_ioperm(arg, 1, (cmd == KDADDIO)) ? -ENXIO : 0; | |
1da177e4 LT |
349 | |
350 | case KDENABIO: | |
351 | case KDDISABIO: | |
0ce8179e | 352 | return ksys_ioperm(GPFIRST, GPNUM, |
1da177e4 LT |
353 | (cmd == KDENABIO)) ? -ENXIO : 0; |
354 | #endif | |
355 | ||
356 | /* Linux m68k/i386 interface for setting the keyboard delay/repeat rate */ | |
832a62ab | 357 | |
1da177e4 LT |
358 | case KDKBDREP: |
359 | { | |
360 | struct kbd_repeat kbrep; | |
832a62ab | 361 | |
1da177e4 | 362 | if (!capable(CAP_SYS_TTY_CONFIG)) |
4001d7b7 | 363 | return -EPERM; |
1da177e4 | 364 | |
0ce8179e JS |
365 | if (copy_from_user(&kbrep, up, sizeof(struct kbd_repeat))) |
366 | return -EFAULT; | |
367 | ||
9cc3c22b AC |
368 | ret = kbd_rate(&kbrep); |
369 | if (ret) | |
0ce8179e | 370 | return ret; |
1da177e4 | 371 | if (copy_to_user(up, &kbrep, sizeof(struct kbd_repeat))) |
0ce8179e | 372 | return -EFAULT; |
9cc3c22b | 373 | break; |
1da177e4 LT |
374 | } |
375 | ||
376 | case KDSETMODE: | |
1da177e4 | 377 | if (!perm) |
4001d7b7 | 378 | return -EPERM; |
a4c53c83 | 379 | |
2287a51b LT |
380 | console_lock(); |
381 | ret = vt_kdsetmode(vc, arg); | |
382 | console_unlock(); | |
383 | return ret; | |
1da177e4 LT |
384 | |
385 | case KDGETMODE: | |
eca734d8 | 386 | return put_user(vc->vc_mode, (int __user *)arg); |
1da177e4 LT |
387 | |
388 | case KDMAPDISP: | |
389 | case KDUNMAPDISP: | |
390 | /* | |
391 | * these work like a combination of mmap and KDENABIO. | |
392 | * this could be easily finished. | |
393 | */ | |
0ce8179e | 394 | return -EINVAL; |
1da177e4 LT |
395 | |
396 | case KDSKBMODE: | |
397 | if (!perm) | |
4001d7b7 | 398 | return -EPERM; |
079c9534 | 399 | ret = vt_do_kdskbmode(console, arg); |
0ce8179e JS |
400 | if (ret) |
401 | return ret; | |
402 | tty_ldisc_flush(tty); | |
9cc3c22b | 403 | break; |
1da177e4 LT |
404 | |
405 | case KDGKBMODE: | |
eca734d8 | 406 | return put_user(vt_do_kdgkbmode(console), (int __user *)arg); |
1da177e4 LT |
407 | |
408 | /* this could be folded into KDSKBMODE, but for compatibility | |
409 | reasons it is not so easy to fold KDGKBMETA into KDGKBMODE */ | |
410 | case KDSKBMETA: | |
0ce8179e | 411 | return vt_do_kdskbmeta(console, arg); |
1da177e4 LT |
412 | |
413 | case KDGKBMETA: | |
079c9534 | 414 | /* FIXME: should review whether this is worth locking */ |
eca734d8 | 415 | return put_user(vt_do_kdgkbmeta(console), (int __user *)arg); |
1da177e4 LT |
416 | |
417 | case KDGETKEYCODE: | |
418 | case KDSETKEYCODE: | |
419 | if(!capable(CAP_SYS_TTY_CONFIG)) | |
9cc3c22b | 420 | perm = 0; |
0ce8179e | 421 | return vt_do_kbkeycode_ioctl(cmd, up, perm); |
1da177e4 LT |
422 | |
423 | case KDGKBENT: | |
424 | case KDSKBENT: | |
0ce8179e | 425 | return vt_do_kdsk_ioctl(cmd, up, perm, console); |
1da177e4 LT |
426 | |
427 | case KDGKBSENT: | |
428 | case KDSKBSENT: | |
0ce8179e | 429 | return vt_do_kdgkb_ioctl(cmd, up, perm); |
1da177e4 | 430 | |
247ff8e6 AC |
431 | /* Diacritical processing. Handled in keyboard.c as it has |
432 | to operate on the keyboard locks and structures */ | |
1da177e4 | 433 | case KDGKBDIACR: |
04c71976 | 434 | case KDGKBDIACRUC: |
1da177e4 | 435 | case KDSKBDIACR: |
04c71976 | 436 | case KDSKBDIACRUC: |
0ce8179e | 437 | return vt_do_diacrit(cmd, up, perm); |
1da177e4 LT |
438 | |
439 | /* the ioctls below read/set the flags usually shown in the leds */ | |
440 | /* don't use them - they will go away without warning */ | |
441 | case KDGKBLED: | |
1da177e4 | 442 | case KDSKBLED: |
1da177e4 | 443 | case KDGETLED: |
1da177e4 | 444 | case KDSETLED: |
0ce8179e | 445 | return vt_do_kdskled(console, cmd, arg, perm); |
1da177e4 LT |
446 | |
447 | /* | |
448 | * A process can indicate its willingness to accept signals | |
449 | * generated by pressing an appropriate key combination. | |
450 | * Thus, one can have a daemon that e.g. spawns a new console | |
451 | * upon a keypress and then changes to it. | |
452 | * See also the kbrequest field of inittab(5). | |
453 | */ | |
454 | case KDSIGACCEPT: | |
1da177e4 | 455 | if (!perm || !capable(CAP_KILL)) |
4001d7b7 | 456 | return -EPERM; |
7ed20e1a | 457 | if (!valid_signal(arg) || arg < 1 || arg == SIGKILL) |
0ce8179e JS |
458 | return -EINVAL; |
459 | ||
460 | spin_lock_irq(&vt_spawn_con.lock); | |
461 | put_pid(vt_spawn_con.pid); | |
462 | vt_spawn_con.pid = get_pid(task_pid(current)); | |
463 | vt_spawn_con.sig = arg; | |
464 | spin_unlock_irq(&vt_spawn_con.lock); | |
9cc3c22b | 465 | break; |
1da177e4 | 466 | |
832a62ab JS |
467 | case KDFONTOP: { |
468 | struct console_font_op op; | |
469 | ||
470 | if (copy_from_user(&op, up, sizeof(op))) | |
471 | return -EFAULT; | |
472 | if (!perm && op.op != KD_FONT_OP_GET) | |
473 | return -EPERM; | |
474 | ret = con_font_op(vc, &op); | |
475 | if (ret) | |
476 | return ret; | |
477 | if (copy_to_user(up, &op, sizeof(op))) | |
478 | return -EFAULT; | |
479 | break; | |
480 | } | |
481 | ||
482 | default: | |
483 | return -ENOIOCTLCMD; | |
484 | } | |
485 | ||
486 | return 0; | |
487 | } | |
488 | ||
832a62ab | 489 | static inline int do_unimap_ioctl(int cmd, struct unimapdesc __user *user_ud, |
d5465479 | 490 | bool perm, struct vc_data *vc) |
832a62ab JS |
491 | { |
492 | struct unimapdesc tmp; | |
493 | ||
494 | if (copy_from_user(&tmp, user_ud, sizeof tmp)) | |
495 | return -EFAULT; | |
496 | switch (cmd) { | |
497 | case PIO_UNIMAP: | |
d5465479 JS |
498 | if (!perm) |
499 | return -EPERM; | |
832a62ab JS |
500 | return con_set_unimap(vc, tmp.entry_ct, tmp.entries); |
501 | case GIO_UNIMAP: | |
d5465479 | 502 | if (!perm && fg_console != vc->vc_num) |
832a62ab JS |
503 | return -EPERM; |
504 | return con_get_unimap(vc, tmp.entry_ct, &(user_ud->entry_ct), | |
505 | tmp.entries); | |
506 | } | |
507 | return 0; | |
508 | } | |
509 | ||
bfbbdfa4 JS |
510 | static int vt_io_ioctl(struct vc_data *vc, unsigned int cmd, void __user *up, |
511 | bool perm) | |
512 | { | |
bfbbdfa4 | 513 | switch (cmd) { |
bfbbdfa4 | 514 | case PIO_CMAP: |
fa26b326 | 515 | if (!perm) |
bfbbdfa4 JS |
516 | return -EPERM; |
517 | return con_set_cmap(up); | |
518 | ||
519 | case GIO_CMAP: | |
fa26b326 | 520 | return con_get_cmap(up); |
bfbbdfa4 | 521 | |
bfbbdfa4 JS |
522 | case PIO_SCRNMAP: |
523 | if (!perm) | |
524 | return -EPERM; | |
525 | return con_set_trans_old(up); | |
526 | ||
527 | case GIO_SCRNMAP: | |
528 | return con_get_trans_old(up); | |
529 | ||
530 | case PIO_UNISCRNMAP: | |
531 | if (!perm) | |
532 | return -EPERM; | |
533 | return con_set_trans_new(up); | |
534 | ||
535 | case GIO_UNISCRNMAP: | |
536 | return con_get_trans_new(up); | |
537 | ||
538 | case PIO_UNIMAPCLR: | |
539 | if (!perm) | |
540 | return -EPERM; | |
541 | con_clear_unimap(vc); | |
542 | break; | |
543 | ||
544 | case PIO_UNIMAP: | |
545 | case GIO_UNIMAP: | |
d5465479 | 546 | return do_unimap_ioctl(cmd, up, perm, vc); |
bfbbdfa4 JS |
547 | |
548 | default: | |
549 | return -ENOIOCTLCMD; | |
550 | } | |
551 | ||
552 | return 0; | |
553 | } | |
554 | ||
535082d9 JS |
555 | static int vt_reldisp(struct vc_data *vc, unsigned int swtch) |
556 | { | |
557 | int newvt, ret; | |
558 | ||
559 | if (vc->vt_mode.mode != VT_PROCESS) | |
560 | return -EINVAL; | |
561 | ||
562 | /* Switched-to response */ | |
563 | if (vc->vt_newvt < 0) { | |
564 | /* If it's just an ACK, ignore it */ | |
565 | return swtch == VT_ACKACQ ? 0 : -EINVAL; | |
566 | } | |
567 | ||
568 | /* Switching-from response */ | |
569 | if (swtch == 0) { | |
570 | /* Switch disallowed, so forget we were trying to do it. */ | |
571 | vc->vt_newvt = -1; | |
572 | return 0; | |
573 | } | |
574 | ||
575 | /* The current vt has been released, so complete the switch. */ | |
576 | newvt = vc->vt_newvt; | |
577 | vc->vt_newvt = -1; | |
578 | ret = vc_allocate(newvt); | |
579 | if (ret) | |
580 | return ret; | |
581 | ||
582 | /* | |
583 | * When we actually do the console switch, make sure we are atomic with | |
584 | * respect to other console switches.. | |
585 | */ | |
586 | complete_change_console(vc_cons[newvt].d); | |
587 | ||
588 | return 0; | |
589 | } | |
590 | ||
ebf1efbb JS |
591 | static int vt_setactivate(struct vt_setactivate __user *sa) |
592 | { | |
593 | struct vt_setactivate vsa; | |
594 | struct vc_data *nvc; | |
595 | int ret; | |
596 | ||
597 | if (copy_from_user(&vsa, sa, sizeof(vsa))) | |
598 | return -EFAULT; | |
599 | if (vsa.console == 0 || vsa.console > MAX_NR_CONSOLES) | |
600 | return -ENXIO; | |
601 | ||
602 | vsa.console = array_index_nospec(vsa.console, MAX_NR_CONSOLES + 1); | |
603 | vsa.console--; | |
604 | console_lock(); | |
605 | ret = vc_allocate(vsa.console); | |
606 | if (ret) { | |
607 | console_unlock(); | |
608 | return ret; | |
609 | } | |
610 | ||
611 | /* | |
612 | * This is safe providing we don't drop the console sem between | |
613 | * vc_allocate and finishing referencing nvc. | |
614 | */ | |
615 | nvc = vc_cons[vsa.console].d; | |
616 | nvc->vt_mode = vsa.mode; | |
617 | nvc->vt_mode.frsig = 0; | |
618 | put_pid(nvc->vt_pid); | |
619 | nvc->vt_pid = get_pid(task_pid(current)); | |
620 | console_unlock(); | |
621 | ||
622 | /* Commence switch and lock */ | |
623 | /* Review set_console locks */ | |
624 | set_console(vsa.console); | |
625 | ||
626 | return 0; | |
627 | } | |
628 | ||
832a62ab JS |
629 | /* deallocate a single console, if possible (leave 0) */ |
630 | static int vt_disallocate(unsigned int vc_num) | |
631 | { | |
632 | struct vc_data *vc = NULL; | |
633 | int ret = 0; | |
634 | ||
635 | console_lock(); | |
636 | if (vt_busy(vc_num)) | |
637 | ret = -EBUSY; | |
638 | else if (vc_num) | |
639 | vc = vc_deallocate(vc_num); | |
640 | console_unlock(); | |
641 | ||
642 | if (vc && vc_num >= MIN_NR_CONSOLES) | |
643 | tty_port_put(&vc->port); | |
644 | ||
645 | return ret; | |
646 | } | |
647 | ||
648 | /* deallocate all unused consoles, but leave 0 */ | |
649 | static void vt_disallocate_all(void) | |
650 | { | |
651 | struct vc_data *vc[MAX_NR_CONSOLES]; | |
652 | int i; | |
653 | ||
654 | console_lock(); | |
655 | for (i = 1; i < MAX_NR_CONSOLES; i++) | |
656 | if (!vt_busy(i)) | |
657 | vc[i] = vc_deallocate(i); | |
658 | else | |
659 | vc[i] = NULL; | |
660 | console_unlock(); | |
661 | ||
662 | for (i = 1; i < MAX_NR_CONSOLES; i++) { | |
663 | if (vc[i] && i >= MIN_NR_CONSOLES) | |
664 | tty_port_put(&vc[i]->port); | |
665 | } | |
666 | } | |
667 | ||
5422337d JS |
668 | static int vt_resizex(struct vc_data *vc, struct vt_consize __user *cs) |
669 | { | |
670 | struct vt_consize v; | |
671 | int i; | |
672 | ||
673 | if (copy_from_user(&v, cs, sizeof(struct vt_consize))) | |
674 | return -EFAULT; | |
675 | ||
a90c275e MR |
676 | /* FIXME: Should check the copies properly */ |
677 | if (!v.v_vlin) | |
678 | v.v_vlin = vc->vc_scan_lines; | |
679 | ||
680 | if (v.v_clin) { | |
681 | int rows = v.v_vlin / v.v_clin; | |
682 | if (v.v_rows != rows) { | |
683 | if (v.v_rows) /* Parameters don't add up */ | |
684 | return -EINVAL; | |
685 | v.v_rows = rows; | |
686 | } | |
687 | } | |
688 | ||
689 | if (v.v_vcol && v.v_ccol) { | |
690 | int cols = v.v_vcol / v.v_ccol; | |
691 | if (v.v_cols != cols) { | |
692 | if (v.v_cols) | |
693 | return -EINVAL; | |
694 | v.v_cols = cols; | |
695 | } | |
696 | } | |
697 | ||
698 | if (v.v_clin > 32) | |
699 | return -EINVAL; | |
5422337d JS |
700 | |
701 | for (i = 0; i < MAX_NR_CONSOLES; i++) { | |
a90c275e | 702 | struct vc_data *vcp; |
5422337d | 703 | |
a90c275e MR |
704 | if (!vc_cons[i].d) |
705 | continue; | |
706 | console_lock(); | |
707 | vcp = vc_cons[i].d; | |
708 | if (vcp) { | |
709 | int ret; | |
710 | int save_scan_lines = vcp->vc_scan_lines; | |
860dafa9 | 711 | int save_cell_height = vcp->vc_cell_height; |
a90c275e MR |
712 | |
713 | if (v.v_vlin) | |
714 | vcp->vc_scan_lines = v.v_vlin; | |
715 | if (v.v_clin) | |
860dafa9 | 716 | vcp->vc_cell_height = v.v_clin; |
a90c275e MR |
717 | vcp->vc_resize_user = 1; |
718 | ret = vc_resize(vcp, v.v_cols, v.v_rows); | |
719 | if (ret) { | |
720 | vcp->vc_scan_lines = save_scan_lines; | |
860dafa9 | 721 | vcp->vc_cell_height = save_cell_height; |
a90c275e MR |
722 | console_unlock(); |
723 | return ret; | |
724 | } | |
5422337d | 725 | } |
a90c275e | 726 | console_unlock(); |
5422337d JS |
727 | } |
728 | ||
729 | return 0; | |
730 | } | |
731 | ||
832a62ab JS |
732 | /* |
733 | * We handle the console-specific ioctl's here. We allow the | |
734 | * capability to modify any console, not just the fg_console. | |
735 | */ | |
736 | int vt_ioctl(struct tty_struct *tty, | |
737 | unsigned int cmd, unsigned long arg) | |
738 | { | |
739 | struct vc_data *vc = tty->driver_data; | |
832a62ab JS |
740 | void __user *up = (void __user *)arg; |
741 | int i, perm; | |
742 | int ret; | |
743 | ||
744 | /* | |
745 | * To have permissions to do most of the vt ioctls, we either have | |
746 | * to be the owner of the tty, or have CAP_SYS_TTY_CONFIG. | |
747 | */ | |
748 | perm = 0; | |
749 | if (current->signal->tty == tty || capable(CAP_SYS_TTY_CONFIG)) | |
750 | perm = 1; | |
751 | ||
752 | ret = vt_k_ioctl(tty, cmd, arg, perm); | |
753 | if (ret != -ENOIOCTLCMD) | |
754 | return ret; | |
755 | ||
bfbbdfa4 JS |
756 | ret = vt_io_ioctl(vc, cmd, up, perm); |
757 | if (ret != -ENOIOCTLCMD) | |
758 | return ret; | |
759 | ||
832a62ab JS |
760 | switch (cmd) { |
761 | case TIOCLINUX: | |
762 | return tioclinux(tty, arg); | |
1da177e4 LT |
763 | case VT_SETMODE: |
764 | { | |
765 | struct vt_mode tmp; | |
766 | ||
767 | if (!perm) | |
4001d7b7 | 768 | return -EPERM; |
0ce8179e JS |
769 | if (copy_from_user(&tmp, up, sizeof(struct vt_mode))) |
770 | return -EFAULT; | |
771 | if (tmp.mode != VT_AUTO && tmp.mode != VT_PROCESS) | |
772 | return -EINVAL; | |
773 | ||
ac751efa | 774 | console_lock(); |
1da177e4 LT |
775 | vc->vt_mode = tmp; |
776 | /* the frsig is ignored, so we set it to 0 */ | |
777 | vc->vt_mode.frsig = 0; | |
8b6312f4 EB |
778 | put_pid(vc->vt_pid); |
779 | vc->vt_pid = get_pid(task_pid(current)); | |
1da177e4 LT |
780 | /* no switch is required -- saw@shade.msu.ru */ |
781 | vc->vt_newvt = -1; | |
ac751efa | 782 | console_unlock(); |
9cc3c22b | 783 | break; |
1da177e4 LT |
784 | } |
785 | ||
786 | case VT_GETMODE: | |
787 | { | |
788 | struct vt_mode tmp; | |
789 | int rc; | |
790 | ||
ac751efa | 791 | console_lock(); |
1da177e4 | 792 | memcpy(&tmp, &vc->vt_mode, sizeof(struct vt_mode)); |
ac751efa | 793 | console_unlock(); |
1da177e4 LT |
794 | |
795 | rc = copy_to_user(up, &tmp, sizeof(struct vt_mode)); | |
9cc3c22b | 796 | if (rc) |
0ce8179e | 797 | return -EFAULT; |
9cc3c22b | 798 | break; |
1da177e4 LT |
799 | } |
800 | ||
801 | /* | |
802 | * Returns global vt state. Note that VT 0 is always open, since | |
803 | * it's an alias for the current VT, and people can't use it here. | |
804 | * We cannot return state for more than 16 VTs, since v_state is short. | |
805 | */ | |
806 | case VT_GETSTATE: | |
807 | { | |
808 | struct vt_stat __user *vtstat = up; | |
809 | unsigned short state, mask; | |
810 | ||
811 | if (put_user(fg_console + 1, &vtstat->v_active)) | |
0ce8179e JS |
812 | return -EFAULT; |
813 | ||
814 | state = 1; /* /dev/tty0 is always open */ | |
815 | console_lock(); /* required by vt_in_use() */ | |
816 | for (i = 0, mask = 2; i < MAX_NR_CONSOLES && mask; | |
817 | ++i, mask <<= 1) | |
818 | if (vt_in_use(i)) | |
819 | state |= mask; | |
820 | console_unlock(); | |
821 | return put_user(state, &vtstat->v_state); | |
1da177e4 LT |
822 | } |
823 | ||
824 | /* | |
825 | * Returns the first available (non-opened) console. | |
826 | */ | |
827 | case VT_OPENQRY: | |
7cf64b18 | 828 | console_lock(); /* required by vt_in_use() */ |
1da177e4 | 829 | for (i = 0; i < MAX_NR_CONSOLES; ++i) |
e587e8f1 | 830 | if (!vt_in_use(i)) |
1da177e4 | 831 | break; |
7cf64b18 | 832 | console_unlock(); |
eca734d8 JS |
833 | i = i < MAX_NR_CONSOLES ? (i+1) : -1; |
834 | return put_user(i, (int __user *)arg); | |
1da177e4 LT |
835 | |
836 | /* | |
837 | * ioctl(fd, VT_ACTIVATE, num) will cause us to switch to vt # num, | |
838 | * with num >= 1 (switches to vt 0, our console, are not allowed, just | |
839 | * to preserve sanity). | |
840 | */ | |
841 | case VT_ACTIVATE: | |
842 | if (!perm) | |
4001d7b7 | 843 | return -EPERM; |
1da177e4 | 844 | if (arg == 0 || arg > MAX_NR_CONSOLES) |
0ce8179e JS |
845 | return -ENXIO; |
846 | ||
847 | arg--; | |
848 | console_lock(); | |
849 | ret = vc_allocate(arg); | |
850 | console_unlock(); | |
851 | if (ret) | |
852 | return ret; | |
853 | set_console(arg); | |
9cc3c22b | 854 | break; |
1da177e4 | 855 | |
d3b5cffc | 856 | case VT_SETACTIVATE: |
d3b5cffc | 857 | if (!perm) |
4001d7b7 | 858 | return -EPERM; |
d3b5cffc | 859 | |
ebf1efbb | 860 | return vt_setactivate(up); |
d3b5cffc | 861 | |
1da177e4 LT |
862 | /* |
863 | * wait until the specified VT has been activated | |
864 | */ | |
865 | case VT_WAITACTIVE: | |
866 | if (!perm) | |
4001d7b7 | 867 | return -EPERM; |
1da177e4 | 868 | if (arg == 0 || arg > MAX_NR_CONSOLES) |
0ce8179e JS |
869 | return -ENXIO; |
870 | return vt_waitactive(arg); | |
1da177e4 LT |
871 | |
872 | /* | |
873 | * If a vt is under process control, the kernel will not switch to it | |
874 | * immediately, but postpone the operation until the process calls this | |
875 | * ioctl, allowing the switch to complete. | |
876 | * | |
877 | * According to the X sources this is the behavior: | |
878 | * 0: pending switch-from not OK | |
879 | * 1: pending switch-from OK | |
880 | * 2: completed switch-to OK | |
881 | */ | |
882 | case VT_RELDISP: | |
883 | if (!perm) | |
4001d7b7 | 884 | return -EPERM; |
1da177e4 | 885 | |
4001d7b7 | 886 | console_lock(); |
535082d9 | 887 | ret = vt_reldisp(vc, arg); |
ac751efa | 888 | console_unlock(); |
535082d9 JS |
889 | |
890 | return ret; | |
891 | ||
1da177e4 LT |
892 | |
893 | /* | |
894 | * Disallocate memory associated to VT (but leave VT1) | |
895 | */ | |
896 | case VT_DISALLOCATE: | |
0ce8179e JS |
897 | if (arg > MAX_NR_CONSOLES) |
898 | return -ENXIO; | |
899 | ||
421b40a6 PH |
900 | if (arg == 0) |
901 | vt_disallocate_all(); | |
902 | else | |
0ce8179e | 903 | return vt_disallocate(--arg); |
9cc3c22b | 904 | break; |
1da177e4 LT |
905 | |
906 | case VT_RESIZE: | |
907 | { | |
908 | struct vt_sizes __user *vtsizes = up; | |
e400b6ec | 909 | struct vc_data *vc; |
1da177e4 | 910 | ushort ll,cc; |
0ce8179e | 911 | |
1da177e4 | 912 | if (!perm) |
4001d7b7 | 913 | return -EPERM; |
1da177e4 LT |
914 | if (get_user(ll, &vtsizes->v_rows) || |
915 | get_user(cc, &vtsizes->v_cols)) | |
0ce8179e | 916 | return -EFAULT; |
e400b6ec | 917 | |
0ce8179e JS |
918 | console_lock(); |
919 | for (i = 0; i < MAX_NR_CONSOLES; i++) { | |
920 | vc = vc_cons[i].d; | |
921 | ||
922 | if (vc) { | |
923 | vc->vc_resize_user = 1; | |
924 | /* FIXME: review v tty lock */ | |
925 | vc_resize(vc_cons[i].d, cc, ll); | |
e400b6ec AD |
926 | } |
927 | } | |
0ce8179e | 928 | console_unlock(); |
9cc3c22b | 929 | break; |
1da177e4 LT |
930 | } |
931 | ||
932 | case VT_RESIZEX: | |
1da177e4 | 933 | if (!perm) |
4001d7b7 | 934 | return -EPERM; |
1da177e4 | 935 | |
5422337d | 936 | return vt_resizex(vc, up); |
1da177e4 | 937 | |
1da177e4 LT |
938 | case VT_LOCKSWITCH: |
939 | if (!capable(CAP_SYS_TTY_CONFIG)) | |
4001d7b7 | 940 | return -EPERM; |
f400991b | 941 | vt_dont_switch = true; |
9cc3c22b | 942 | break; |
1da177e4 LT |
943 | case VT_UNLOCKSWITCH: |
944 | if (!capable(CAP_SYS_TTY_CONFIG)) | |
4001d7b7 | 945 | return -EPERM; |
f400991b | 946 | vt_dont_switch = false; |
9cc3c22b | 947 | break; |
533475d3 | 948 | case VT_GETHIFONTMASK: |
0ce8179e | 949 | return put_user(vc->vc_hi_font_mask, |
9cc3c22b | 950 | (unsigned short __user *)arg); |
8b92e87d | 951 | case VT_WAITEVENT: |
0ce8179e | 952 | return vt_event_wait_ioctl((struct vt_event __user *)arg); |
1da177e4 | 953 | default: |
0ce8179e | 954 | return -ENOIOCTLCMD; |
1da177e4 | 955 | } |
0ce8179e JS |
956 | |
957 | return 0; | |
1da177e4 LT |
958 | } |
959 | ||
748b150f | 960 | void reset_vc(struct vc_data *vc) |
1da177e4 | 961 | { |
748b150f | 962 | vc->vc_mode = KD_TEXT; |
079c9534 | 963 | vt_reset_unicode(vc->vc_num); |
1da177e4 LT |
964 | vc->vt_mode.mode = VT_AUTO; |
965 | vc->vt_mode.waitv = 0; | |
966 | vc->vt_mode.relsig = 0; | |
967 | vc->vt_mode.acqsig = 0; | |
968 | vc->vt_mode.frsig = 0; | |
8b6312f4 EB |
969 | put_pid(vc->vt_pid); |
970 | vc->vt_pid = NULL; | |
1da177e4 | 971 | vc->vt_newvt = -1; |
151db8c0 | 972 | reset_palette(vc); |
1da177e4 LT |
973 | } |
974 | ||
8b6312f4 EB |
975 | void vc_SAK(struct work_struct *work) |
976 | { | |
977 | struct vc *vc_con = | |
978 | container_of(work, struct vc, SAK_work); | |
979 | struct vc_data *vc; | |
980 | struct tty_struct *tty; | |
981 | ||
ac751efa | 982 | console_lock(); |
8b6312f4 EB |
983 | vc = vc_con->d; |
984 | if (vc) { | |
079c9534 | 985 | /* FIXME: review tty ref counting */ |
8ce73264 | 986 | tty = vc->port.tty; |
8b6312f4 EB |
987 | /* |
988 | * SAK should also work in all raw modes and reset | |
989 | * them properly. | |
990 | */ | |
991 | if (tty) | |
992 | __do_SAK(tty); | |
748b150f | 993 | reset_vc(vc); |
8b6312f4 | 994 | } |
ac751efa | 995 | console_unlock(); |
8b6312f4 EB |
996 | } |
997 | ||
e9216651 AB |
998 | #ifdef CONFIG_COMPAT |
999 | ||
e9216651 AB |
1000 | struct compat_console_font_op { |
1001 | compat_uint_t op; /* operation code KD_FONT_OP_* */ | |
1002 | compat_uint_t flags; /* KD_FONT_FLAG_* */ | |
1003 | compat_uint_t width, height; /* font size */ | |
1004 | compat_uint_t charcount; | |
1005 | compat_caddr_t data; /* font data with height fixed to 32 */ | |
1006 | }; | |
1007 | ||
1008 | static inline int | |
1009 | compat_kdfontop_ioctl(struct compat_console_font_op __user *fontop, | |
1010 | int perm, struct console_font_op *op, struct vc_data *vc) | |
1011 | { | |
1012 | int i; | |
1013 | ||
1014 | if (copy_from_user(op, fontop, sizeof(struct compat_console_font_op))) | |
1015 | return -EFAULT; | |
1016 | if (!perm && op->op != KD_FONT_OP_GET) | |
1017 | return -EPERM; | |
1018 | op->data = compat_ptr(((struct compat_console_font_op *)op)->data); | |
e9216651 AB |
1019 | i = con_font_op(vc, op); |
1020 | if (i) | |
1021 | return i; | |
1022 | ((struct compat_console_font_op *)op)->data = (unsigned long)op->data; | |
1023 | if (copy_to_user(fontop, op, sizeof(struct compat_console_font_op))) | |
1024 | return -EFAULT; | |
1025 | return 0; | |
1026 | } | |
1027 | ||
1028 | struct compat_unimapdesc { | |
1029 | unsigned short entry_ct; | |
1030 | compat_caddr_t entries; | |
1031 | }; | |
1032 | ||
1033 | static inline int | |
1034 | compat_unimap_ioctl(unsigned int cmd, struct compat_unimapdesc __user *user_ud, | |
1035 | int perm, struct vc_data *vc) | |
1036 | { | |
1037 | struct compat_unimapdesc tmp; | |
1038 | struct unipair __user *tmp_entries; | |
1039 | ||
1040 | if (copy_from_user(&tmp, user_ud, sizeof tmp)) | |
1041 | return -EFAULT; | |
1042 | tmp_entries = compat_ptr(tmp.entries); | |
e9216651 AB |
1043 | switch (cmd) { |
1044 | case PIO_UNIMAP: | |
1045 | if (!perm) | |
1046 | return -EPERM; | |
1047 | return con_set_unimap(vc, tmp.entry_ct, tmp_entries); | |
1048 | case GIO_UNIMAP: | |
1049 | if (!perm && fg_console != vc->vc_num) | |
1050 | return -EPERM; | |
1051 | return con_get_unimap(vc, tmp.entry_ct, &(user_ud->entry_ct), tmp_entries); | |
1052 | } | |
1053 | return 0; | |
1054 | } | |
1055 | ||
6caa76b7 | 1056 | long vt_compat_ioctl(struct tty_struct *tty, |
e9216651 AB |
1057 | unsigned int cmd, unsigned long arg) |
1058 | { | |
1059 | struct vc_data *vc = tty->driver_data; | |
1060 | struct console_font_op op; /* used in multiple places here */ | |
9d1807da | 1061 | void __user *up = compat_ptr(arg); |
e9216651 | 1062 | int perm; |
e9216651 | 1063 | |
e9216651 AB |
1064 | /* |
1065 | * To have permissions to do most of the vt ioctls, we either have | |
1066 | * to be the owner of the tty, or have CAP_SYS_TTY_CONFIG. | |
1067 | */ | |
1068 | perm = 0; | |
1069 | if (current->signal->tty == tty || capable(CAP_SYS_TTY_CONFIG)) | |
1070 | perm = 1; | |
1071 | ||
e9216651 AB |
1072 | switch (cmd) { |
1073 | /* | |
1074 | * these need special handlers for incompatible data structures | |
1075 | */ | |
e9216651 AB |
1076 | |
1077 | case KDFONTOP: | |
9d1807da | 1078 | return compat_kdfontop_ioctl(up, perm, &op, vc); |
e9216651 AB |
1079 | |
1080 | case PIO_UNIMAP: | |
1081 | case GIO_UNIMAP: | |
9d1807da | 1082 | return compat_unimap_ioctl(cmd, up, perm, vc); |
e9216651 AB |
1083 | |
1084 | /* | |
1085 | * all these treat 'arg' as an integer | |
1086 | */ | |
1087 | case KIOCSOUND: | |
1088 | case KDMKTONE: | |
1089 | #ifdef CONFIG_X86 | |
1090 | case KDADDIO: | |
1091 | case KDDELIO: | |
1092 | #endif | |
1093 | case KDSETMODE: | |
1094 | case KDMAPDISP: | |
1095 | case KDUNMAPDISP: | |
1096 | case KDSKBMODE: | |
1097 | case KDSKBMETA: | |
1098 | case KDSKBLED: | |
1099 | case KDSETLED: | |
1100 | case KDSIGACCEPT: | |
1101 | case VT_ACTIVATE: | |
1102 | case VT_WAITACTIVE: | |
1103 | case VT_RELDISP: | |
1104 | case VT_DISALLOCATE: | |
1105 | case VT_RESIZE: | |
1106 | case VT_RESIZEX: | |
9d1807da | 1107 | return vt_ioctl(tty, cmd, arg); |
e9216651 AB |
1108 | |
1109 | /* | |
1110 | * the rest has a compatible data structure behind arg, | |
1111 | * but we have to convert it to a proper 64 bit pointer. | |
1112 | */ | |
1113 | default: | |
9d1807da | 1114 | return vt_ioctl(tty, cmd, (unsigned long)up); |
e9216651 | 1115 | } |
e9216651 AB |
1116 | } |
1117 | ||
1118 | ||
1119 | #endif /* CONFIG_COMPAT */ | |
1120 | ||
1121 | ||
1da177e4 | 1122 | /* |
d3b5cffc AC |
1123 | * Performs the back end of a vt switch. Called under the console |
1124 | * semaphore. | |
1da177e4 LT |
1125 | */ |
1126 | static void complete_change_console(struct vc_data *vc) | |
1127 | { | |
1128 | unsigned char old_vc_mode; | |
8b92e87d | 1129 | int old = fg_console; |
1da177e4 LT |
1130 | |
1131 | last_console = fg_console; | |
1132 | ||
1133 | /* | |
1134 | * If we're switching, we could be going from KD_GRAPHICS to | |
1135 | * KD_TEXT mode or vice versa, which means we need to blank or | |
1136 | * unblank the screen later. | |
1137 | */ | |
1138 | old_vc_mode = vc_cons[fg_console].d->vc_mode; | |
1139 | switch_screen(vc); | |
1140 | ||
1141 | /* | |
3dfcaf16 | 1142 | * This can't appear below a successful kill_pid(). If it did, |
1da177e4 LT |
1143 | * then the *blank_screen operation could occur while X, having |
1144 | * received acqsig, is waking up on another processor. This | |
1145 | * condition can lead to overlapping accesses to the VGA range | |
1146 | * and the framebuffer (causing system lockups). | |
1147 | * | |
1148 | * To account for this we duplicate this code below only if the | |
1149 | * controlling process is gone and we've called reset_vc. | |
1150 | */ | |
1151 | if (old_vc_mode != vc->vc_mode) { | |
1152 | if (vc->vc_mode == KD_TEXT) | |
1153 | do_unblank_screen(1); | |
1154 | else | |
1155 | do_blank_screen(1); | |
1156 | } | |
1157 | ||
1158 | /* | |
1159 | * If this new console is under process control, send it a signal | |
1160 | * telling it that it has acquired. Also check if it has died and | |
1161 | * clean up (similar to logic employed in change_console()) | |
1162 | */ | |
87a6aca5 | 1163 | if (vc->vt_mode.mode == VT_PROCESS) { |
1da177e4 | 1164 | /* |
3dfcaf16 | 1165 | * Send the signal as privileged - kill_pid() will |
1da177e4 LT |
1166 | * tell us if the process has gone or something else |
1167 | * is awry | |
1168 | */ | |
bde0d2c9 | 1169 | if (kill_pid(vc->vt_pid, vc->vt_mode.acqsig, 1) != 0) { |
1da177e4 LT |
1170 | /* |
1171 | * The controlling process has died, so we revert back to | |
1172 | * normal operation. In this case, we'll also change back | |
1173 | * to KD_TEXT mode. I'm not sure if this is strictly correct | |
1174 | * but it saves the agony when the X server dies and the screen | |
1175 | * remains blanked due to KD_GRAPHICS! It would be nice to do | |
1176 | * this outside of VT_PROCESS but there is no single process | |
1177 | * to account for and tracking tty count may be undesirable. | |
1178 | */ | |
748b150f | 1179 | reset_vc(vc); |
1da177e4 LT |
1180 | |
1181 | if (old_vc_mode != vc->vc_mode) { | |
1182 | if (vc->vc_mode == KD_TEXT) | |
1183 | do_unblank_screen(1); | |
1184 | else | |
1185 | do_blank_screen(1); | |
1186 | } | |
1187 | } | |
1188 | } | |
1189 | ||
1190 | /* | |
1191 | * Wake anyone waiting for their VT to activate | |
1192 | */ | |
8b92e87d | 1193 | vt_event_post(VT_EVENT_SWITCH, old, vc->vc_num); |
1da177e4 LT |
1194 | return; |
1195 | } | |
1196 | ||
1197 | /* | |
1198 | * Performs the front-end of a vt switch | |
1199 | */ | |
1200 | void change_console(struct vc_data *new_vc) | |
1201 | { | |
1202 | struct vc_data *vc; | |
1203 | ||
1204 | if (!new_vc || new_vc->vc_num == fg_console || vt_dont_switch) | |
1205 | return; | |
1206 | ||
1207 | /* | |
1208 | * If this vt is in process mode, then we need to handshake with | |
1209 | * that process before switching. Essentially, we store where that | |
1210 | * vt wants to switch to and wait for it to tell us when it's done | |
1211 | * (via VT_RELDISP ioctl). | |
1212 | * | |
1213 | * We also check to see if the controlling process still exists. | |
1214 | * If it doesn't, we reset this vt to auto mode and continue. | |
1215 | * This is a cheap way to track process control. The worst thing | |
1216 | * that can happen is: we send a signal to a process, it dies, and | |
1217 | * the switch gets "lost" waiting for a response; hopefully, the | |
1218 | * user will try again, we'll detect the process is gone (unless | |
1219 | * the user waits just the right amount of time :-) and revert the | |
1220 | * vt to auto control. | |
1221 | */ | |
1222 | vc = vc_cons[fg_console].d; | |
87a6aca5 | 1223 | if (vc->vt_mode.mode == VT_PROCESS) { |
1da177e4 | 1224 | /* |
3dfcaf16 | 1225 | * Send the signal as privileged - kill_pid() will |
1da177e4 | 1226 | * tell us if the process has gone or something else |
a64314e6 JL |
1227 | * is awry. |
1228 | * | |
1229 | * We need to set vt_newvt *before* sending the signal or we | |
1230 | * have a race. | |
1da177e4 | 1231 | */ |
a64314e6 | 1232 | vc->vt_newvt = new_vc->vc_num; |
bde0d2c9 | 1233 | if (kill_pid(vc->vt_pid, vc->vt_mode.relsig, 1) == 0) { |
1da177e4 | 1234 | /* |
87a6aca5 GKH |
1235 | * It worked. Mark the vt to switch to and |
1236 | * return. The process needs to send us a | |
1237 | * VT_RELDISP ioctl to complete the switch. | |
1da177e4 | 1238 | */ |
87a6aca5 | 1239 | return; |
1da177e4 LT |
1240 | } |
1241 | ||
1242 | /* | |
87a6aca5 GKH |
1243 | * The controlling process has died, so we revert back to |
1244 | * normal operation. In this case, we'll also change back | |
1245 | * to KD_TEXT mode. I'm not sure if this is strictly correct | |
1246 | * but it saves the agony when the X server dies and the screen | |
1247 | * remains blanked due to KD_GRAPHICS! It would be nice to do | |
1248 | * this outside of VT_PROCESS but there is no single process | |
1249 | * to account for and tracking tty count may be undesirable. | |
1250 | */ | |
748b150f | 1251 | reset_vc(vc); |
87a6aca5 GKH |
1252 | |
1253 | /* | |
1254 | * Fall through to normal (VT_AUTO) handling of the switch... | |
1da177e4 LT |
1255 | */ |
1256 | } | |
1257 | ||
1258 | /* | |
1259 | * Ignore all switches in KD_GRAPHICS+VT_AUTO mode | |
1260 | */ | |
1261 | if (vc->vc_mode == KD_GRAPHICS) | |
1262 | return; | |
1263 | ||
1264 | complete_change_console(new_vc); | |
1265 | } | |
8d233558 AC |
1266 | |
1267 | /* Perform a kernel triggered VT switch for suspend/resume */ | |
1268 | ||
1269 | static int disable_vt_switch; | |
1270 | ||
1271 | int vt_move_to_console(unsigned int vt, int alloc) | |
1272 | { | |
1273 | int prev; | |
1274 | ||
ac751efa | 1275 | console_lock(); |
8d233558 AC |
1276 | /* Graphics mode - up to X */ |
1277 | if (disable_vt_switch) { | |
ac751efa | 1278 | console_unlock(); |
8d233558 AC |
1279 | return 0; |
1280 | } | |
1281 | prev = fg_console; | |
1282 | ||
1283 | if (alloc && vc_allocate(vt)) { | |
1284 | /* we can't have a free VC for now. Too bad, | |
1285 | * we don't want to mess the screen for now. */ | |
ac751efa | 1286 | console_unlock(); |
8d233558 AC |
1287 | return -ENOSPC; |
1288 | } | |
1289 | ||
1290 | if (set_console(vt)) { | |
1291 | /* | |
1292 | * We're unable to switch to the SUSPEND_CONSOLE. | |
1293 | * Let the calling function know so it can decide | |
1294 | * what to do. | |
1295 | */ | |
ac751efa | 1296 | console_unlock(); |
8d233558 AC |
1297 | return -EIO; |
1298 | } | |
ac751efa | 1299 | console_unlock(); |
797938b5 | 1300 | if (vt_waitactive(vt + 1)) { |
8d233558 AC |
1301 | pr_debug("Suspend: Can't switch VCs."); |
1302 | return -EINTR; | |
1303 | } | |
1304 | return prev; | |
1305 | } | |
1306 | ||
1307 | /* | |
1308 | * Normally during a suspend, we allocate a new console and switch to it. | |
1309 | * When we resume, we switch back to the original console. This switch | |
1310 | * can be slow, so on systems where the framebuffer can handle restoration | |
1311 | * of video registers anyways, there's little point in doing the console | |
1312 | * switch. This function allows you to disable it by passing it '0'. | |
1313 | */ | |
1314 | void pm_set_vt_switch(int do_switch) | |
1315 | { | |
ac751efa | 1316 | console_lock(); |
8d233558 | 1317 | disable_vt_switch = !do_switch; |
ac751efa | 1318 | console_unlock(); |
8d233558 AC |
1319 | } |
1320 | EXPORT_SYMBOL(pm_set_vt_switch); |