Commit | Line | Data |
---|---|---|
1da177e4 | 1 | /* |
1da177e4 LT |
2 | * Copyright (C) 1992 obz under the linux copyright |
3 | * | |
4 | * Dynamic diacritical handling - aeb@cwi.nl - Dec 1993 | |
5 | * Dynamic keymap and string allocation - aeb@cwi.nl - May 1994 | |
6 | * Restrict VT switching via ioctl() - grif@cs.ucr.edu - Dec 1995 | |
7 | * Some code moved for less code duplication - Andi Kleen - Mar 1997 | |
8 | * Check put/get_user, cleanups - acme@conectiva.com.br - Jun 2001 | |
9 | */ | |
10 | ||
1da177e4 LT |
11 | #include <linux/types.h> |
12 | #include <linux/errno.h> | |
13 | #include <linux/sched.h> | |
14 | #include <linux/tty.h> | |
15 | #include <linux/timer.h> | |
16 | #include <linux/kernel.h> | |
e9216651 | 17 | #include <linux/compat.h> |
8d233558 | 18 | #include <linux/module.h> |
1da177e4 LT |
19 | #include <linux/kd.h> |
20 | #include <linux/vt.h> | |
21 | #include <linux/string.h> | |
22 | #include <linux/slab.h> | |
23 | #include <linux/major.h> | |
24 | #include <linux/fs.h> | |
25 | #include <linux/console.h> | |
04c71976 | 26 | #include <linux/consolemap.h> |
7ed20e1a | 27 | #include <linux/signal.h> |
bcc8ca09 | 28 | #include <linux/timex.h> |
1da177e4 LT |
29 | |
30 | #include <asm/io.h> | |
31 | #include <asm/uaccess.h> | |
32 | ||
33 | #include <linux/kbd_kern.h> | |
34 | #include <linux/vt_kern.h> | |
35 | #include <linux/kbd_diacr.h> | |
36 | #include <linux/selection.h> | |
37 | ||
b257bc05 | 38 | char vt_dont_switch; |
1da177e4 LT |
39 | extern struct tty_driver *console_driver; |
40 | ||
41 | #define VT_IS_IN_USE(i) (console_driver->ttys[i] && console_driver->ttys[i]->count) | |
42 | #define VT_BUSY(i) (VT_IS_IN_USE(i) || i == fg_console || vc_cons[i].d == sel_cons) | |
43 | ||
44 | /* | |
45 | * Console (vt and kd) routines, as defined by USL SVR4 manual, and by | |
46 | * experimentation and study of X386 SYSV handling. | |
47 | * | |
48 | * One point of difference: SYSV vt's are /dev/vtX, which X >= 0, and | |
49 | * /dev/console is a separate ttyp. Under Linux, /dev/tty0 is /dev/console, | |
50 | * and the vc start at /dev/ttyX, X >= 1. We maintain that here, so we will | |
51 | * always treat our set of vt as numbered 1..MAX_NR_CONSOLES (corresponding to | |
52 | * ttys 0..MAX_NR_CONSOLES-1). Explicitly naming VT 0 is illegal, but using | |
53 | * /dev/tty0 (fg_console) as a target is legal, since an implicit aliasing | |
54 | * to the current console is done by the main ioctl code. | |
55 | */ | |
56 | ||
57 | #ifdef CONFIG_X86 | |
58 | #include <linux/syscalls.h> | |
59 | #endif | |
60 | ||
61 | static void complete_change_console(struct vc_data *vc); | |
62 | ||
8b92e87d AC |
63 | /* |
64 | * User space VT_EVENT handlers | |
65 | */ | |
66 | ||
67 | struct vt_event_wait { | |
68 | struct list_head list; | |
69 | struct vt_event event; | |
70 | int done; | |
71 | }; | |
72 | ||
73 | static LIST_HEAD(vt_events); | |
74 | static DEFINE_SPINLOCK(vt_event_lock); | |
75 | static DECLARE_WAIT_QUEUE_HEAD(vt_event_waitqueue); | |
76 | ||
77 | /** | |
78 | * vt_event_post | |
79 | * @event: the event that occurred | |
80 | * @old: old console | |
81 | * @new: new console | |
82 | * | |
83 | * Post an VT event to interested VT handlers | |
84 | */ | |
85 | ||
86 | void vt_event_post(unsigned int event, unsigned int old, unsigned int new) | |
87 | { | |
88 | struct list_head *pos, *head; | |
89 | unsigned long flags; | |
90 | int wake = 0; | |
91 | ||
92 | spin_lock_irqsave(&vt_event_lock, flags); | |
93 | head = &vt_events; | |
94 | ||
95 | list_for_each(pos, head) { | |
96 | struct vt_event_wait *ve = list_entry(pos, | |
97 | struct vt_event_wait, list); | |
98 | if (!(ve->event.event & event)) | |
99 | continue; | |
100 | ve->event.event = event; | |
101 | /* kernel view is consoles 0..n-1, user space view is | |
102 | console 1..n with 0 meaning current, so we must bias */ | |
308efab5 AC |
103 | ve->event.oldev = old + 1; |
104 | ve->event.newev = new + 1; | |
8b92e87d AC |
105 | wake = 1; |
106 | ve->done = 1; | |
107 | } | |
108 | spin_unlock_irqrestore(&vt_event_lock, flags); | |
109 | if (wake) | |
110 | wake_up_interruptible(&vt_event_waitqueue); | |
111 | } | |
112 | ||
a7b12929 | 113 | static void __vt_event_queue(struct vt_event_wait *vw) |
8b92e87d AC |
114 | { |
115 | unsigned long flags; | |
116 | /* Prepare the event */ | |
117 | INIT_LIST_HEAD(&vw->list); | |
118 | vw->done = 0; | |
119 | /* Queue our event */ | |
120 | spin_lock_irqsave(&vt_event_lock, flags); | |
121 | list_add(&vw->list, &vt_events); | |
122 | spin_unlock_irqrestore(&vt_event_lock, flags); | |
a7b12929 RV |
123 | } |
124 | ||
125 | static void __vt_event_wait(struct vt_event_wait *vw) | |
126 | { | |
8b92e87d | 127 | /* Wait for it to pass */ |
99cceb4e | 128 | wait_event_interruptible(vt_event_waitqueue, vw->done); |
a7b12929 RV |
129 | } |
130 | ||
131 | static void __vt_event_dequeue(struct vt_event_wait *vw) | |
132 | { | |
133 | unsigned long flags; | |
134 | ||
8b92e87d AC |
135 | /* Dequeue it */ |
136 | spin_lock_irqsave(&vt_event_lock, flags); | |
137 | list_del(&vw->list); | |
138 | spin_unlock_irqrestore(&vt_event_lock, flags); | |
139 | } | |
140 | ||
a7b12929 RV |
141 | /** |
142 | * vt_event_wait - wait for an event | |
143 | * @vw: our event | |
144 | * | |
145 | * Waits for an event to occur which completes our vt_event_wait | |
146 | * structure. On return the structure has wv->done set to 1 for success | |
147 | * or 0 if some event such as a signal ended the wait. | |
148 | */ | |
149 | ||
150 | static void vt_event_wait(struct vt_event_wait *vw) | |
151 | { | |
152 | __vt_event_queue(vw); | |
153 | __vt_event_wait(vw); | |
154 | __vt_event_dequeue(vw); | |
155 | } | |
156 | ||
8b92e87d AC |
157 | /** |
158 | * vt_event_wait_ioctl - event ioctl handler | |
159 | * @arg: argument to ioctl | |
160 | * | |
161 | * Implement the VT_WAITEVENT ioctl using the VT event interface | |
162 | */ | |
163 | ||
164 | static int vt_event_wait_ioctl(struct vt_event __user *event) | |
165 | { | |
166 | struct vt_event_wait vw; | |
167 | ||
168 | if (copy_from_user(&vw.event, event, sizeof(struct vt_event))) | |
169 | return -EFAULT; | |
170 | /* Highest supported event for now */ | |
171 | if (vw.event.event & ~VT_MAX_EVENT) | |
172 | return -EINVAL; | |
173 | ||
174 | vt_event_wait(&vw); | |
175 | /* If it occurred report it */ | |
176 | if (vw.done) { | |
177 | if (copy_to_user(event, &vw.event, sizeof(struct vt_event))) | |
178 | return -EFAULT; | |
179 | return 0; | |
180 | } | |
181 | return -EINTR; | |
182 | } | |
183 | ||
184 | /** | |
185 | * vt_waitactive - active console wait | |
186 | * @event: event code | |
187 | * @n: new console | |
188 | * | |
189 | * Helper for event waits. Used to implement the legacy | |
190 | * event waiting ioctls in terms of events | |
191 | */ | |
192 | ||
193 | int vt_waitactive(int n) | |
194 | { | |
195 | struct vt_event_wait vw; | |
196 | do { | |
8b92e87d | 197 | vw.event.event = VT_EVENT_SWITCH; |
a7b12929 RV |
198 | __vt_event_queue(&vw); |
199 | if (n == fg_console + 1) { | |
200 | __vt_event_dequeue(&vw); | |
201 | break; | |
202 | } | |
203 | __vt_event_wait(&vw); | |
204 | __vt_event_dequeue(&vw); | |
8b92e87d AC |
205 | if (vw.done == 0) |
206 | return -EINTR; | |
308efab5 | 207 | } while (vw.event.newev != n); |
8b92e87d AC |
208 | return 0; |
209 | } | |
210 | ||
1da177e4 LT |
211 | /* |
212 | * these are the valid i/o ports we're allowed to change. they map all the | |
213 | * video ports | |
214 | */ | |
215 | #define GPFIRST 0x3b4 | |
216 | #define GPLAST 0x3df | |
217 | #define GPNUM (GPLAST - GPFIRST + 1) | |
218 | ||
1da177e4 | 219 | |
1da177e4 LT |
220 | |
221 | static inline int | |
222 | do_fontx_ioctl(int cmd, struct consolefontdesc __user *user_cfd, int perm, struct console_font_op *op) | |
223 | { | |
224 | struct consolefontdesc cfdarg; | |
225 | int i; | |
226 | ||
227 | if (copy_from_user(&cfdarg, user_cfd, sizeof(struct consolefontdesc))) | |
228 | return -EFAULT; | |
229 | ||
230 | switch (cmd) { | |
231 | case PIO_FONTX: | |
232 | if (!perm) | |
233 | return -EPERM; | |
234 | op->op = KD_FONT_OP_SET; | |
235 | op->flags = KD_FONT_FLAG_OLD; | |
236 | op->width = 8; | |
237 | op->height = cfdarg.charheight; | |
238 | op->charcount = cfdarg.charcount; | |
239 | op->data = cfdarg.chardata; | |
240 | return con_font_op(vc_cons[fg_console].d, op); | |
241 | case GIO_FONTX: { | |
242 | op->op = KD_FONT_OP_GET; | |
243 | op->flags = KD_FONT_FLAG_OLD; | |
244 | op->width = 8; | |
245 | op->height = cfdarg.charheight; | |
246 | op->charcount = cfdarg.charcount; | |
247 | op->data = cfdarg.chardata; | |
248 | i = con_font_op(vc_cons[fg_console].d, op); | |
249 | if (i) | |
250 | return i; | |
251 | cfdarg.charheight = op->height; | |
252 | cfdarg.charcount = op->charcount; | |
253 | if (copy_to_user(user_cfd, &cfdarg, sizeof(struct consolefontdesc))) | |
254 | return -EFAULT; | |
255 | return 0; | |
256 | } | |
257 | } | |
258 | return -EINVAL; | |
259 | } | |
260 | ||
261 | static inline int | |
262 | do_unimap_ioctl(int cmd, struct unimapdesc __user *user_ud, int perm, struct vc_data *vc) | |
263 | { | |
264 | struct unimapdesc tmp; | |
265 | ||
266 | if (copy_from_user(&tmp, user_ud, sizeof tmp)) | |
267 | return -EFAULT; | |
268 | if (tmp.entries) | |
269 | if (!access_ok(VERIFY_WRITE, tmp.entries, | |
270 | tmp.entry_ct*sizeof(struct unipair))) | |
271 | return -EFAULT; | |
272 | switch (cmd) { | |
273 | case PIO_UNIMAP: | |
274 | if (!perm) | |
275 | return -EPERM; | |
276 | return con_set_unimap(vc, tmp.entry_ct, tmp.entries); | |
277 | case GIO_UNIMAP: | |
278 | if (!perm && fg_console != vc->vc_num) | |
279 | return -EPERM; | |
280 | return con_get_unimap(vc, tmp.entry_ct, &(user_ud->entry_ct), tmp.entries); | |
281 | } | |
282 | return 0; | |
283 | } | |
284 | ||
8b92e87d AC |
285 | |
286 | ||
1da177e4 LT |
287 | /* |
288 | * We handle the console-specific ioctl's here. We allow the | |
289 | * capability to modify any console, not just the fg_console. | |
290 | */ | |
6caa76b7 | 291 | int vt_ioctl(struct tty_struct *tty, |
1da177e4 LT |
292 | unsigned int cmd, unsigned long arg) |
293 | { | |
c9f19e96 | 294 | struct vc_data *vc = tty->driver_data; |
1da177e4 | 295 | struct console_font_op op; /* used in multiple places here */ |
1da177e4 LT |
296 | unsigned int console; |
297 | unsigned char ucval; | |
1e0ad288 | 298 | unsigned int uival; |
1da177e4 LT |
299 | void __user *up = (void __user *)arg; |
300 | int i, perm; | |
9cc3c22b AC |
301 | int ret = 0; |
302 | ||
1da177e4 LT |
303 | console = vc->vc_num; |
304 | ||
9cc3c22b AC |
305 | |
306 | if (!vc_cons_allocated(console)) { /* impossible? */ | |
307 | ret = -ENOIOCTLCMD; | |
308 | goto out; | |
309 | } | |
310 | ||
1da177e4 LT |
311 | |
312 | /* | |
313 | * To have permissions to do most of the vt ioctls, we either have | |
314 | * to be the owner of the tty, or have CAP_SYS_TTY_CONFIG. | |
315 | */ | |
316 | perm = 0; | |
317 | if (current->signal->tty == tty || capable(CAP_SYS_TTY_CONFIG)) | |
318 | perm = 1; | |
319 | ||
1da177e4 | 320 | switch (cmd) { |
e6885107 | 321 | case TIOCLINUX: |
a115902f JS |
322 | ret = tioclinux(tty, arg); |
323 | break; | |
1da177e4 LT |
324 | case KIOCSOUND: |
325 | if (!perm) | |
4001d7b7 | 326 | return -EPERM; |
2c4e9671 AB |
327 | /* |
328 | * The use of PIT_TICK_RATE is historic, it used to be | |
329 | * the platform-dependent CLOCK_TICK_RATE between 2.6.12 | |
330 | * and 2.6.36, which was a minor but unfortunate ABI | |
4001d7b7 | 331 | * change. kd_mksound is locked by the input layer. |
2c4e9671 | 332 | */ |
1da177e4 | 333 | if (arg) |
2c4e9671 | 334 | arg = PIT_TICK_RATE / arg; |
1da177e4 | 335 | kd_mksound(arg, 0); |
9cc3c22b | 336 | break; |
1da177e4 LT |
337 | |
338 | case KDMKTONE: | |
339 | if (!perm) | |
4001d7b7 | 340 | return -EPERM; |
1da177e4 LT |
341 | { |
342 | unsigned int ticks, count; | |
343 | ||
344 | /* | |
345 | * Generate the tone for the appropriate number of ticks. | |
346 | * If the time is zero, turn off sound ourselves. | |
347 | */ | |
348 | ticks = HZ * ((arg >> 16) & 0xffff) / 1000; | |
349 | count = ticks ? (arg & 0xffff) : 0; | |
350 | if (count) | |
2c4e9671 | 351 | count = PIT_TICK_RATE / count; |
1da177e4 | 352 | kd_mksound(count, ticks); |
9cc3c22b | 353 | break; |
1da177e4 LT |
354 | } |
355 | ||
356 | case KDGKBTYPE: | |
357 | /* | |
4001d7b7 | 358 | * this is naïve. |
1da177e4 LT |
359 | */ |
360 | ucval = KB_101; | |
079c9534 AC |
361 | ret = put_user(ucval, (char __user *)arg); |
362 | break; | |
1da177e4 LT |
363 | |
364 | /* | |
365 | * These cannot be implemented on any machine that implements | |
366 | * ioperm() in user level (such as Alpha PCs) or not at all. | |
367 | * | |
368 | * XXX: you should never use these, just call ioperm directly.. | |
369 | */ | |
370 | #ifdef CONFIG_X86 | |
371 | case KDADDIO: | |
372 | case KDDELIO: | |
373 | /* | |
374 | * KDADDIO and KDDELIO may be able to add ports beyond what | |
375 | * we reject here, but to be safe... | |
4001d7b7 AC |
376 | * |
377 | * These are locked internally via sys_ioperm | |
1da177e4 | 378 | */ |
9cc3c22b AC |
379 | if (arg < GPFIRST || arg > GPLAST) { |
380 | ret = -EINVAL; | |
381 | break; | |
382 | } | |
383 | ret = sys_ioperm(arg, 1, (cmd == KDADDIO)) ? -ENXIO : 0; | |
384 | break; | |
1da177e4 LT |
385 | |
386 | case KDENABIO: | |
387 | case KDDISABIO: | |
9cc3c22b | 388 | ret = sys_ioperm(GPFIRST, GPNUM, |
1da177e4 | 389 | (cmd == KDENABIO)) ? -ENXIO : 0; |
9cc3c22b | 390 | break; |
1da177e4 LT |
391 | #endif |
392 | ||
393 | /* Linux m68k/i386 interface for setting the keyboard delay/repeat rate */ | |
394 | ||
395 | case KDKBDREP: | |
396 | { | |
397 | struct kbd_repeat kbrep; | |
1da177e4 LT |
398 | |
399 | if (!capable(CAP_SYS_TTY_CONFIG)) | |
4001d7b7 | 400 | return -EPERM; |
1da177e4 | 401 | |
9cc3c22b AC |
402 | if (copy_from_user(&kbrep, up, sizeof(struct kbd_repeat))) { |
403 | ret = -EFAULT; | |
404 | break; | |
405 | } | |
406 | ret = kbd_rate(&kbrep); | |
407 | if (ret) | |
408 | break; | |
1da177e4 | 409 | if (copy_to_user(up, &kbrep, sizeof(struct kbd_repeat))) |
9cc3c22b AC |
410 | ret = -EFAULT; |
411 | break; | |
1da177e4 LT |
412 | } |
413 | ||
414 | case KDSETMODE: | |
415 | /* | |
416 | * currently, setting the mode from KD_TEXT to KD_GRAPHICS | |
417 | * doesn't do a whole lot. i'm not sure if it should do any | |
418 | * restoration of modes or what... | |
419 | * | |
420 | * XXX It should at least call into the driver, fbdev's definitely | |
421 | * need to restore their engine state. --BenH | |
422 | */ | |
423 | if (!perm) | |
4001d7b7 | 424 | return -EPERM; |
1da177e4 LT |
425 | switch (arg) { |
426 | case KD_GRAPHICS: | |
427 | break; | |
428 | case KD_TEXT0: | |
429 | case KD_TEXT1: | |
430 | arg = KD_TEXT; | |
431 | case KD_TEXT: | |
432 | break; | |
433 | default: | |
9cc3c22b AC |
434 | ret = -EINVAL; |
435 | goto out; | |
1da177e4 | 436 | } |
4001d7b7 | 437 | /* FIXME: this needs the console lock extending */ |
1da177e4 | 438 | if (vc->vc_mode == (unsigned char) arg) |
9cc3c22b | 439 | break; |
1da177e4 LT |
440 | vc->vc_mode = (unsigned char) arg; |
441 | if (console != fg_console) | |
9cc3c22b | 442 | break; |
1da177e4 LT |
443 | /* |
444 | * explicitly blank/unblank the screen if switching modes | |
445 | */ | |
ac751efa | 446 | console_lock(); |
1da177e4 LT |
447 | if (arg == KD_TEXT) |
448 | do_unblank_screen(1); | |
449 | else | |
450 | do_blank_screen(1); | |
ac751efa | 451 | console_unlock(); |
9cc3c22b | 452 | break; |
1da177e4 LT |
453 | |
454 | case KDGETMODE: | |
1e0ad288 | 455 | uival = vc->vc_mode; |
1da177e4 LT |
456 | goto setint; |
457 | ||
458 | case KDMAPDISP: | |
459 | case KDUNMAPDISP: | |
460 | /* | |
461 | * these work like a combination of mmap and KDENABIO. | |
462 | * this could be easily finished. | |
463 | */ | |
9cc3c22b AC |
464 | ret = -EINVAL; |
465 | break; | |
1da177e4 LT |
466 | |
467 | case KDSKBMODE: | |
468 | if (!perm) | |
4001d7b7 | 469 | return -EPERM; |
079c9534 AC |
470 | ret = vt_do_kdskbmode(console, arg); |
471 | if (ret == 0) | |
472 | tty_ldisc_flush(tty); | |
9cc3c22b | 473 | break; |
1da177e4 LT |
474 | |
475 | case KDGKBMODE: | |
079c9534 AC |
476 | uival = vt_do_kdgkbmode(console); |
477 | ret = put_user(uival, (int __user *)arg); | |
478 | break; | |
1da177e4 LT |
479 | |
480 | /* this could be folded into KDSKBMODE, but for compatibility | |
481 | reasons it is not so easy to fold KDGKBMETA into KDGKBMODE */ | |
482 | case KDSKBMETA: | |
079c9534 | 483 | ret = vt_do_kdskbmeta(console, arg); |
9cc3c22b | 484 | break; |
1da177e4 LT |
485 | |
486 | case KDGKBMETA: | |
079c9534 AC |
487 | /* FIXME: should review whether this is worth locking */ |
488 | uival = vt_do_kdgkbmeta(console); | |
1da177e4 | 489 | setint: |
1e0ad288 | 490 | ret = put_user(uival, (int __user *)arg); |
9cc3c22b | 491 | break; |
1da177e4 LT |
492 | |
493 | case KDGETKEYCODE: | |
494 | case KDSETKEYCODE: | |
495 | if(!capable(CAP_SYS_TTY_CONFIG)) | |
9cc3c22b | 496 | perm = 0; |
079c9534 | 497 | ret = vt_do_kbkeycode_ioctl(cmd, up, perm); |
9cc3c22b | 498 | break; |
1da177e4 LT |
499 | |
500 | case KDGKBENT: | |
501 | case KDSKBENT: | |
079c9534 | 502 | ret = vt_do_kdsk_ioctl(cmd, up, perm, console); |
9cc3c22b | 503 | break; |
1da177e4 LT |
504 | |
505 | case KDGKBSENT: | |
506 | case KDSKBSENT: | |
079c9534 | 507 | ret = vt_do_kdgkb_ioctl(cmd, up, perm); |
9cc3c22b | 508 | break; |
1da177e4 | 509 | |
247ff8e6 AC |
510 | /* Diacritical processing. Handled in keyboard.c as it has |
511 | to operate on the keyboard locks and structures */ | |
1da177e4 | 512 | case KDGKBDIACR: |
04c71976 | 513 | case KDGKBDIACRUC: |
1da177e4 | 514 | case KDSKBDIACR: |
04c71976 | 515 | case KDSKBDIACRUC: |
247ff8e6 | 516 | ret = vt_do_diacrit(cmd, up, perm); |
9cc3c22b | 517 | break; |
1da177e4 LT |
518 | |
519 | /* the ioctls below read/set the flags usually shown in the leds */ | |
520 | /* don't use them - they will go away without warning */ | |
521 | case KDGKBLED: | |
1da177e4 | 522 | case KDSKBLED: |
1da177e4 | 523 | case KDGETLED: |
1da177e4 | 524 | case KDSETLED: |
079c9534 | 525 | ret = vt_do_kdskled(console, cmd, arg, perm); |
9cc3c22b | 526 | break; |
1da177e4 LT |
527 | |
528 | /* | |
529 | * A process can indicate its willingness to accept signals | |
530 | * generated by pressing an appropriate key combination. | |
531 | * Thus, one can have a daemon that e.g. spawns a new console | |
532 | * upon a keypress and then changes to it. | |
533 | * See also the kbrequest field of inittab(5). | |
534 | */ | |
535 | case KDSIGACCEPT: | |
536 | { | |
1da177e4 | 537 | if (!perm || !capable(CAP_KILL)) |
4001d7b7 | 538 | return -EPERM; |
7ed20e1a | 539 | if (!valid_signal(arg) || arg < 1 || arg == SIGKILL) |
9cc3c22b AC |
540 | ret = -EINVAL; |
541 | else { | |
542 | spin_lock_irq(&vt_spawn_con.lock); | |
543 | put_pid(vt_spawn_con.pid); | |
544 | vt_spawn_con.pid = get_pid(task_pid(current)); | |
545 | vt_spawn_con.sig = arg; | |
546 | spin_unlock_irq(&vt_spawn_con.lock); | |
547 | } | |
548 | break; | |
1da177e4 LT |
549 | } |
550 | ||
551 | case VT_SETMODE: | |
552 | { | |
553 | struct vt_mode tmp; | |
554 | ||
555 | if (!perm) | |
4001d7b7 | 556 | return -EPERM; |
9cc3c22b AC |
557 | if (copy_from_user(&tmp, up, sizeof(struct vt_mode))) { |
558 | ret = -EFAULT; | |
559 | goto out; | |
560 | } | |
87a6aca5 | 561 | if (tmp.mode != VT_AUTO && tmp.mode != VT_PROCESS) { |
9cc3c22b AC |
562 | ret = -EINVAL; |
563 | goto out; | |
564 | } | |
ac751efa | 565 | console_lock(); |
1da177e4 LT |
566 | vc->vt_mode = tmp; |
567 | /* the frsig is ignored, so we set it to 0 */ | |
568 | vc->vt_mode.frsig = 0; | |
8b6312f4 EB |
569 | put_pid(vc->vt_pid); |
570 | vc->vt_pid = get_pid(task_pid(current)); | |
1da177e4 LT |
571 | /* no switch is required -- saw@shade.msu.ru */ |
572 | vc->vt_newvt = -1; | |
ac751efa | 573 | console_unlock(); |
9cc3c22b | 574 | break; |
1da177e4 LT |
575 | } |
576 | ||
577 | case VT_GETMODE: | |
578 | { | |
579 | struct vt_mode tmp; | |
580 | int rc; | |
581 | ||
ac751efa | 582 | console_lock(); |
1da177e4 | 583 | memcpy(&tmp, &vc->vt_mode, sizeof(struct vt_mode)); |
ac751efa | 584 | console_unlock(); |
1da177e4 LT |
585 | |
586 | rc = copy_to_user(up, &tmp, sizeof(struct vt_mode)); | |
9cc3c22b AC |
587 | if (rc) |
588 | ret = -EFAULT; | |
589 | break; | |
1da177e4 LT |
590 | } |
591 | ||
592 | /* | |
593 | * Returns global vt state. Note that VT 0 is always open, since | |
594 | * it's an alias for the current VT, and people can't use it here. | |
595 | * We cannot return state for more than 16 VTs, since v_state is short. | |
596 | */ | |
597 | case VT_GETSTATE: | |
598 | { | |
599 | struct vt_stat __user *vtstat = up; | |
600 | unsigned short state, mask; | |
601 | ||
4001d7b7 | 602 | /* Review: FIXME: Console lock ? */ |
1da177e4 | 603 | if (put_user(fg_console + 1, &vtstat->v_active)) |
9cc3c22b AC |
604 | ret = -EFAULT; |
605 | else { | |
606 | state = 1; /* /dev/tty0 is always open */ | |
607 | for (i = 0, mask = 2; i < MAX_NR_CONSOLES && mask; | |
608 | ++i, mask <<= 1) | |
609 | if (VT_IS_IN_USE(i)) | |
610 | state |= mask; | |
611 | ret = put_user(state, &vtstat->v_state); | |
612 | } | |
613 | break; | |
1da177e4 LT |
614 | } |
615 | ||
616 | /* | |
617 | * Returns the first available (non-opened) console. | |
618 | */ | |
619 | case VT_OPENQRY: | |
4001d7b7 | 620 | /* FIXME: locking ? - but then this is a stupid API */ |
1da177e4 LT |
621 | for (i = 0; i < MAX_NR_CONSOLES; ++i) |
622 | if (! VT_IS_IN_USE(i)) | |
623 | break; | |
1e0ad288 | 624 | uival = i < MAX_NR_CONSOLES ? (i+1) : -1; |
1da177e4 LT |
625 | goto setint; |
626 | ||
627 | /* | |
628 | * ioctl(fd, VT_ACTIVATE, num) will cause us to switch to vt # num, | |
629 | * with num >= 1 (switches to vt 0, our console, are not allowed, just | |
630 | * to preserve sanity). | |
631 | */ | |
632 | case VT_ACTIVATE: | |
633 | if (!perm) | |
4001d7b7 | 634 | return -EPERM; |
1da177e4 | 635 | if (arg == 0 || arg > MAX_NR_CONSOLES) |
9cc3c22b AC |
636 | ret = -ENXIO; |
637 | else { | |
638 | arg--; | |
ac751efa | 639 | console_lock(); |
9cc3c22b | 640 | ret = vc_allocate(arg); |
ac751efa | 641 | console_unlock(); |
9cc3c22b AC |
642 | if (ret) |
643 | break; | |
644 | set_console(arg); | |
645 | } | |
646 | break; | |
1da177e4 | 647 | |
d3b5cffc AC |
648 | case VT_SETACTIVATE: |
649 | { | |
650 | struct vt_setactivate vsa; | |
651 | ||
652 | if (!perm) | |
4001d7b7 | 653 | return -EPERM; |
d3b5cffc AC |
654 | |
655 | if (copy_from_user(&vsa, (struct vt_setactivate __user *)arg, | |
a09efb07 JS |
656 | sizeof(struct vt_setactivate))) { |
657 | ret = -EFAULT; | |
658 | goto out; | |
659 | } | |
d3b5cffc AC |
660 | if (vsa.console == 0 || vsa.console > MAX_NR_CONSOLES) |
661 | ret = -ENXIO; | |
662 | else { | |
663 | vsa.console--; | |
ac751efa | 664 | console_lock(); |
d3b5cffc AC |
665 | ret = vc_allocate(vsa.console); |
666 | if (ret == 0) { | |
667 | struct vc_data *nvc; | |
668 | /* This is safe providing we don't drop the | |
669 | console sem between vc_allocate and | |
670 | finishing referencing nvc */ | |
671 | nvc = vc_cons[vsa.console].d; | |
672 | nvc->vt_mode = vsa.mode; | |
673 | nvc->vt_mode.frsig = 0; | |
674 | put_pid(nvc->vt_pid); | |
675 | nvc->vt_pid = get_pid(task_pid(current)); | |
676 | } | |
ac751efa | 677 | console_unlock(); |
d3b5cffc AC |
678 | if (ret) |
679 | break; | |
680 | /* Commence switch and lock */ | |
4001d7b7 | 681 | /* Review set_console locks */ |
d6378375 | 682 | set_console(vsa.console); |
d3b5cffc | 683 | } |
d6378375 | 684 | break; |
d3b5cffc AC |
685 | } |
686 | ||
1da177e4 LT |
687 | /* |
688 | * wait until the specified VT has been activated | |
689 | */ | |
690 | case VT_WAITACTIVE: | |
691 | if (!perm) | |
4001d7b7 | 692 | return -EPERM; |
1da177e4 | 693 | if (arg == 0 || arg > MAX_NR_CONSOLES) |
9cc3c22b | 694 | ret = -ENXIO; |
99cceb4e | 695 | else |
8b92e87d | 696 | ret = vt_waitactive(arg); |
9cc3c22b | 697 | break; |
1da177e4 LT |
698 | |
699 | /* | |
700 | * If a vt is under process control, the kernel will not switch to it | |
701 | * immediately, but postpone the operation until the process calls this | |
702 | * ioctl, allowing the switch to complete. | |
703 | * | |
704 | * According to the X sources this is the behavior: | |
705 | * 0: pending switch-from not OK | |
706 | * 1: pending switch-from OK | |
707 | * 2: completed switch-to OK | |
708 | */ | |
709 | case VT_RELDISP: | |
710 | if (!perm) | |
4001d7b7 | 711 | return -EPERM; |
1da177e4 | 712 | |
4001d7b7 | 713 | console_lock(); |
9cc3c22b | 714 | if (vc->vt_mode.mode != VT_PROCESS) { |
4001d7b7 | 715 | console_unlock(); |
9cc3c22b AC |
716 | ret = -EINVAL; |
717 | break; | |
718 | } | |
1da177e4 LT |
719 | /* |
720 | * Switching-from response | |
721 | */ | |
722 | if (vc->vt_newvt >= 0) { | |
723 | if (arg == 0) | |
724 | /* | |
725 | * Switch disallowed, so forget we were trying | |
726 | * to do it. | |
727 | */ | |
728 | vc->vt_newvt = -1; | |
729 | ||
730 | else { | |
731 | /* | |
732 | * The current vt has been released, so | |
733 | * complete the switch. | |
734 | */ | |
735 | int newvt; | |
1da177e4 LT |
736 | newvt = vc->vt_newvt; |
737 | vc->vt_newvt = -1; | |
9cc3c22b AC |
738 | ret = vc_allocate(newvt); |
739 | if (ret) { | |
ac751efa | 740 | console_unlock(); |
9cc3c22b | 741 | break; |
1da177e4 LT |
742 | } |
743 | /* | |
744 | * When we actually do the console switch, | |
745 | * make sure we are atomic with respect to | |
746 | * other console switches.. | |
747 | */ | |
748 | complete_change_console(vc_cons[newvt].d); | |
1da177e4 | 749 | } |
9cc3c22b AC |
750 | } else { |
751 | /* | |
752 | * Switched-to response | |
753 | */ | |
1da177e4 LT |
754 | /* |
755 | * If it's just an ACK, ignore it | |
756 | */ | |
9cc3c22b AC |
757 | if (arg != VT_ACKACQ) |
758 | ret = -EINVAL; | |
1da177e4 | 759 | } |
ac751efa | 760 | console_unlock(); |
9cc3c22b | 761 | break; |
1da177e4 LT |
762 | |
763 | /* | |
764 | * Disallocate memory associated to VT (but leave VT1) | |
765 | */ | |
766 | case VT_DISALLOCATE: | |
9cc3c22b AC |
767 | if (arg > MAX_NR_CONSOLES) { |
768 | ret = -ENXIO; | |
769 | break; | |
770 | } | |
1da177e4 | 771 | if (arg == 0) { |
ca9bda00 | 772 | /* deallocate all unused consoles, but leave 0 */ |
ac751efa | 773 | console_lock(); |
1da177e4 LT |
774 | for (i=1; i<MAX_NR_CONSOLES; i++) |
775 | if (! VT_BUSY(i)) | |
ca9bda00 | 776 | vc_deallocate(i); |
ac751efa | 777 | console_unlock(); |
1da177e4 | 778 | } else { |
ca9bda00 | 779 | /* deallocate a single console, if possible */ |
1da177e4 LT |
780 | arg--; |
781 | if (VT_BUSY(arg)) | |
9cc3c22b AC |
782 | ret = -EBUSY; |
783 | else if (arg) { /* leave 0 */ | |
ac751efa | 784 | console_lock(); |
ca9bda00 | 785 | vc_deallocate(arg); |
ac751efa | 786 | console_unlock(); |
1da177e4 LT |
787 | } |
788 | } | |
9cc3c22b | 789 | break; |
1da177e4 LT |
790 | |
791 | case VT_RESIZE: | |
792 | { | |
793 | struct vt_sizes __user *vtsizes = up; | |
e400b6ec AD |
794 | struct vc_data *vc; |
795 | ||
1da177e4 LT |
796 | ushort ll,cc; |
797 | if (!perm) | |
4001d7b7 | 798 | return -EPERM; |
1da177e4 LT |
799 | if (get_user(ll, &vtsizes->v_rows) || |
800 | get_user(cc, &vtsizes->v_cols)) | |
9cc3c22b AC |
801 | ret = -EFAULT; |
802 | else { | |
ac751efa | 803 | console_lock(); |
9cc3c22b AC |
804 | for (i = 0; i < MAX_NR_CONSOLES; i++) { |
805 | vc = vc_cons[i].d; | |
e400b6ec | 806 | |
9cc3c22b AC |
807 | if (vc) { |
808 | vc->vc_resize_user = 1; | |
4001d7b7 | 809 | /* FIXME: review v tty lock */ |
8c9a9dd0 | 810 | vc_resize(vc_cons[i].d, cc, ll); |
9cc3c22b | 811 | } |
e400b6ec | 812 | } |
ac751efa | 813 | console_unlock(); |
e400b6ec | 814 | } |
9cc3c22b | 815 | break; |
1da177e4 LT |
816 | } |
817 | ||
818 | case VT_RESIZEX: | |
819 | { | |
820 | struct vt_consize __user *vtconsize = up; | |
821 | ushort ll,cc,vlin,clin,vcol,ccol; | |
822 | if (!perm) | |
4001d7b7 | 823 | return -EPERM; |
1da177e4 | 824 | if (!access_ok(VERIFY_READ, vtconsize, |
9cc3c22b AC |
825 | sizeof(struct vt_consize))) { |
826 | ret = -EFAULT; | |
827 | break; | |
828 | } | |
829 | /* FIXME: Should check the copies properly */ | |
1da177e4 LT |
830 | __get_user(ll, &vtconsize->v_rows); |
831 | __get_user(cc, &vtconsize->v_cols); | |
832 | __get_user(vlin, &vtconsize->v_vlin); | |
833 | __get_user(clin, &vtconsize->v_clin); | |
834 | __get_user(vcol, &vtconsize->v_vcol); | |
835 | __get_user(ccol, &vtconsize->v_ccol); | |
836 | vlin = vlin ? vlin : vc->vc_scan_lines; | |
837 | if (clin) { | |
838 | if (ll) { | |
9cc3c22b AC |
839 | if (ll != vlin/clin) { |
840 | /* Parameters don't add up */ | |
841 | ret = -EINVAL; | |
842 | break; | |
843 | } | |
1da177e4 LT |
844 | } else |
845 | ll = vlin/clin; | |
846 | } | |
847 | if (vcol && ccol) { | |
848 | if (cc) { | |
9cc3c22b AC |
849 | if (cc != vcol/ccol) { |
850 | ret = -EINVAL; | |
851 | break; | |
852 | } | |
1da177e4 LT |
853 | } else |
854 | cc = vcol/ccol; | |
855 | } | |
856 | ||
9cc3c22b AC |
857 | if (clin > 32) { |
858 | ret = -EINVAL; | |
859 | break; | |
860 | } | |
1da177e4 LT |
861 | |
862 | for (i = 0; i < MAX_NR_CONSOLES; i++) { | |
863 | if (!vc_cons[i].d) | |
864 | continue; | |
ac751efa | 865 | console_lock(); |
1da177e4 LT |
866 | if (vlin) |
867 | vc_cons[i].d->vc_scan_lines = vlin; | |
868 | if (clin) | |
869 | vc_cons[i].d->vc_font.height = clin; | |
e400b6ec | 870 | vc_cons[i].d->vc_resize_user = 1; |
1da177e4 | 871 | vc_resize(vc_cons[i].d, cc, ll); |
ac751efa | 872 | console_unlock(); |
1da177e4 | 873 | } |
9cc3c22b | 874 | break; |
1da177e4 LT |
875 | } |
876 | ||
877 | case PIO_FONT: { | |
878 | if (!perm) | |
4001d7b7 | 879 | return -EPERM; |
1da177e4 LT |
880 | op.op = KD_FONT_OP_SET; |
881 | op.flags = KD_FONT_FLAG_OLD | KD_FONT_FLAG_DONT_RECALC; /* Compatibility */ | |
882 | op.width = 8; | |
883 | op.height = 0; | |
884 | op.charcount = 256; | |
885 | op.data = up; | |
9cc3c22b AC |
886 | ret = con_font_op(vc_cons[fg_console].d, &op); |
887 | break; | |
1da177e4 LT |
888 | } |
889 | ||
890 | case GIO_FONT: { | |
891 | op.op = KD_FONT_OP_GET; | |
892 | op.flags = KD_FONT_FLAG_OLD; | |
893 | op.width = 8; | |
894 | op.height = 32; | |
895 | op.charcount = 256; | |
896 | op.data = up; | |
9cc3c22b AC |
897 | ret = con_font_op(vc_cons[fg_console].d, &op); |
898 | break; | |
1da177e4 LT |
899 | } |
900 | ||
901 | case PIO_CMAP: | |
902 | if (!perm) | |
9cc3c22b AC |
903 | ret = -EPERM; |
904 | else | |
905 | ret = con_set_cmap(up); | |
906 | break; | |
1da177e4 LT |
907 | |
908 | case GIO_CMAP: | |
9cc3c22b AC |
909 | ret = con_get_cmap(up); |
910 | break; | |
1da177e4 LT |
911 | |
912 | case PIO_FONTX: | |
913 | case GIO_FONTX: | |
9cc3c22b AC |
914 | ret = do_fontx_ioctl(cmd, up, perm, &op); |
915 | break; | |
1da177e4 LT |
916 | |
917 | case PIO_FONTRESET: | |
918 | { | |
919 | if (!perm) | |
4001d7b7 | 920 | return -EPERM; |
1da177e4 LT |
921 | |
922 | #ifdef BROKEN_GRAPHICS_PROGRAMS | |
923 | /* With BROKEN_GRAPHICS_PROGRAMS defined, the default | |
924 | font is not saved. */ | |
9cc3c22b AC |
925 | ret = -ENOSYS; |
926 | break; | |
1da177e4 LT |
927 | #else |
928 | { | |
929 | op.op = KD_FONT_OP_SET_DEFAULT; | |
930 | op.data = NULL; | |
9cc3c22b AC |
931 | ret = con_font_op(vc_cons[fg_console].d, &op); |
932 | if (ret) | |
933 | break; | |
5d1a33fa | 934 | console_lock(); |
1da177e4 | 935 | con_set_default_unimap(vc_cons[fg_console].d); |
5d1a33fa | 936 | console_unlock(); |
9cc3c22b | 937 | break; |
1da177e4 LT |
938 | } |
939 | #endif | |
940 | } | |
941 | ||
942 | case KDFONTOP: { | |
9cc3c22b AC |
943 | if (copy_from_user(&op, up, sizeof(op))) { |
944 | ret = -EFAULT; | |
945 | break; | |
946 | } | |
1da177e4 | 947 | if (!perm && op.op != KD_FONT_OP_GET) |
4001d7b7 | 948 | return -EPERM; |
9cc3c22b AC |
949 | ret = con_font_op(vc, &op); |
950 | if (ret) | |
951 | break; | |
1da177e4 | 952 | if (copy_to_user(up, &op, sizeof(op))) |
9cc3c22b AC |
953 | ret = -EFAULT; |
954 | break; | |
1da177e4 LT |
955 | } |
956 | ||
957 | case PIO_SCRNMAP: | |
958 | if (!perm) | |
9cc3c22b | 959 | ret = -EPERM; |
5d1a33fa | 960 | else |
9cc3c22b AC |
961 | ret = con_set_trans_old(up); |
962 | break; | |
1da177e4 LT |
963 | |
964 | case GIO_SCRNMAP: | |
9cc3c22b AC |
965 | ret = con_get_trans_old(up); |
966 | break; | |
1da177e4 LT |
967 | |
968 | case PIO_UNISCRNMAP: | |
969 | if (!perm) | |
9cc3c22b | 970 | ret = -EPERM; |
5d1a33fa | 971 | else |
9cc3c22b AC |
972 | ret = con_set_trans_new(up); |
973 | break; | |
1da177e4 LT |
974 | |
975 | case GIO_UNISCRNMAP: | |
9cc3c22b AC |
976 | ret = con_get_trans_new(up); |
977 | break; | |
1da177e4 LT |
978 | |
979 | case PIO_UNIMAPCLR: | |
980 | { struct unimapinit ui; | |
981 | if (!perm) | |
4001d7b7 | 982 | return -EPERM; |
9cc3c22b | 983 | ret = copy_from_user(&ui, up, sizeof(struct unimapinit)); |
3fde85df DC |
984 | if (ret) |
985 | ret = -EFAULT; | |
5d1a33fa | 986 | else |
9cc3c22b AC |
987 | con_clear_unimap(vc, &ui); |
988 | break; | |
1da177e4 LT |
989 | } |
990 | ||
991 | case PIO_UNIMAP: | |
992 | case GIO_UNIMAP: | |
9cc3c22b AC |
993 | ret = do_unimap_ioctl(cmd, up, perm, vc); |
994 | break; | |
1da177e4 LT |
995 | |
996 | case VT_LOCKSWITCH: | |
997 | if (!capable(CAP_SYS_TTY_CONFIG)) | |
4001d7b7 | 998 | return -EPERM; |
1da177e4 | 999 | vt_dont_switch = 1; |
9cc3c22b | 1000 | break; |
1da177e4 LT |
1001 | case VT_UNLOCKSWITCH: |
1002 | if (!capable(CAP_SYS_TTY_CONFIG)) | |
4001d7b7 | 1003 | return -EPERM; |
1da177e4 | 1004 | vt_dont_switch = 0; |
9cc3c22b | 1005 | break; |
533475d3 | 1006 | case VT_GETHIFONTMASK: |
9cc3c22b AC |
1007 | ret = put_user(vc->vc_hi_font_mask, |
1008 | (unsigned short __user *)arg); | |
1009 | break; | |
8b92e87d AC |
1010 | case VT_WAITEVENT: |
1011 | ret = vt_event_wait_ioctl((struct vt_event __user *)arg); | |
1012 | break; | |
1da177e4 | 1013 | default: |
9cc3c22b | 1014 | ret = -ENOIOCTLCMD; |
1da177e4 | 1015 | } |
9cc3c22b | 1016 | out: |
9cc3c22b | 1017 | return ret; |
1da177e4 LT |
1018 | } |
1019 | ||
1da177e4 LT |
1020 | void reset_vc(struct vc_data *vc) |
1021 | { | |
1022 | vc->vc_mode = KD_TEXT; | |
079c9534 | 1023 | vt_reset_unicode(vc->vc_num); |
1da177e4 LT |
1024 | vc->vt_mode.mode = VT_AUTO; |
1025 | vc->vt_mode.waitv = 0; | |
1026 | vc->vt_mode.relsig = 0; | |
1027 | vc->vt_mode.acqsig = 0; | |
1028 | vc->vt_mode.frsig = 0; | |
8b6312f4 EB |
1029 | put_pid(vc->vt_pid); |
1030 | vc->vt_pid = NULL; | |
1da177e4 LT |
1031 | vc->vt_newvt = -1; |
1032 | if (!in_interrupt()) /* Via keyboard.c:SAK() - akpm */ | |
1033 | reset_palette(vc); | |
1034 | } | |
1035 | ||
8b6312f4 EB |
1036 | void vc_SAK(struct work_struct *work) |
1037 | { | |
1038 | struct vc *vc_con = | |
1039 | container_of(work, struct vc, SAK_work); | |
1040 | struct vc_data *vc; | |
1041 | struct tty_struct *tty; | |
1042 | ||
ac751efa | 1043 | console_lock(); |
8b6312f4 EB |
1044 | vc = vc_con->d; |
1045 | if (vc) { | |
079c9534 | 1046 | /* FIXME: review tty ref counting */ |
8ce73264 | 1047 | tty = vc->port.tty; |
8b6312f4 EB |
1048 | /* |
1049 | * SAK should also work in all raw modes and reset | |
1050 | * them properly. | |
1051 | */ | |
1052 | if (tty) | |
1053 | __do_SAK(tty); | |
1054 | reset_vc(vc); | |
1055 | } | |
ac751efa | 1056 | console_unlock(); |
8b6312f4 EB |
1057 | } |
1058 | ||
e9216651 AB |
1059 | #ifdef CONFIG_COMPAT |
1060 | ||
1061 | struct compat_consolefontdesc { | |
1062 | unsigned short charcount; /* characters in font (256 or 512) */ | |
1063 | unsigned short charheight; /* scan lines per character (1-32) */ | |
1064 | compat_caddr_t chardata; /* font data in expanded form */ | |
1065 | }; | |
1066 | ||
1067 | static inline int | |
1068 | compat_fontx_ioctl(int cmd, struct compat_consolefontdesc __user *user_cfd, | |
1069 | int perm, struct console_font_op *op) | |
1070 | { | |
1071 | struct compat_consolefontdesc cfdarg; | |
1072 | int i; | |
1073 | ||
1074 | if (copy_from_user(&cfdarg, user_cfd, sizeof(struct compat_consolefontdesc))) | |
1075 | return -EFAULT; | |
1076 | ||
1077 | switch (cmd) { | |
1078 | case PIO_FONTX: | |
1079 | if (!perm) | |
1080 | return -EPERM; | |
1081 | op->op = KD_FONT_OP_SET; | |
1082 | op->flags = KD_FONT_FLAG_OLD; | |
1083 | op->width = 8; | |
1084 | op->height = cfdarg.charheight; | |
1085 | op->charcount = cfdarg.charcount; | |
1086 | op->data = compat_ptr(cfdarg.chardata); | |
1087 | return con_font_op(vc_cons[fg_console].d, op); | |
1088 | case GIO_FONTX: | |
1089 | op->op = KD_FONT_OP_GET; | |
1090 | op->flags = KD_FONT_FLAG_OLD; | |
1091 | op->width = 8; | |
1092 | op->height = cfdarg.charheight; | |
1093 | op->charcount = cfdarg.charcount; | |
1094 | op->data = compat_ptr(cfdarg.chardata); | |
1095 | i = con_font_op(vc_cons[fg_console].d, op); | |
1096 | if (i) | |
1097 | return i; | |
1098 | cfdarg.charheight = op->height; | |
1099 | cfdarg.charcount = op->charcount; | |
1100 | if (copy_to_user(user_cfd, &cfdarg, sizeof(struct compat_consolefontdesc))) | |
1101 | return -EFAULT; | |
1102 | return 0; | |
1103 | } | |
1104 | return -EINVAL; | |
1105 | } | |
1106 | ||
1107 | struct compat_console_font_op { | |
1108 | compat_uint_t op; /* operation code KD_FONT_OP_* */ | |
1109 | compat_uint_t flags; /* KD_FONT_FLAG_* */ | |
1110 | compat_uint_t width, height; /* font size */ | |
1111 | compat_uint_t charcount; | |
1112 | compat_caddr_t data; /* font data with height fixed to 32 */ | |
1113 | }; | |
1114 | ||
1115 | static inline int | |
1116 | compat_kdfontop_ioctl(struct compat_console_font_op __user *fontop, | |
1117 | int perm, struct console_font_op *op, struct vc_data *vc) | |
1118 | { | |
1119 | int i; | |
1120 | ||
1121 | if (copy_from_user(op, fontop, sizeof(struct compat_console_font_op))) | |
1122 | return -EFAULT; | |
1123 | if (!perm && op->op != KD_FONT_OP_GET) | |
1124 | return -EPERM; | |
1125 | op->data = compat_ptr(((struct compat_console_font_op *)op)->data); | |
e9216651 AB |
1126 | i = con_font_op(vc, op); |
1127 | if (i) | |
1128 | return i; | |
1129 | ((struct compat_console_font_op *)op)->data = (unsigned long)op->data; | |
1130 | if (copy_to_user(fontop, op, sizeof(struct compat_console_font_op))) | |
1131 | return -EFAULT; | |
1132 | return 0; | |
1133 | } | |
1134 | ||
1135 | struct compat_unimapdesc { | |
1136 | unsigned short entry_ct; | |
1137 | compat_caddr_t entries; | |
1138 | }; | |
1139 | ||
1140 | static inline int | |
1141 | compat_unimap_ioctl(unsigned int cmd, struct compat_unimapdesc __user *user_ud, | |
1142 | int perm, struct vc_data *vc) | |
1143 | { | |
1144 | struct compat_unimapdesc tmp; | |
1145 | struct unipair __user *tmp_entries; | |
1146 | ||
1147 | if (copy_from_user(&tmp, user_ud, sizeof tmp)) | |
1148 | return -EFAULT; | |
1149 | tmp_entries = compat_ptr(tmp.entries); | |
1150 | if (tmp_entries) | |
1151 | if (!access_ok(VERIFY_WRITE, tmp_entries, | |
1152 | tmp.entry_ct*sizeof(struct unipair))) | |
1153 | return -EFAULT; | |
1154 | switch (cmd) { | |
1155 | case PIO_UNIMAP: | |
1156 | if (!perm) | |
1157 | return -EPERM; | |
1158 | return con_set_unimap(vc, tmp.entry_ct, tmp_entries); | |
1159 | case GIO_UNIMAP: | |
1160 | if (!perm && fg_console != vc->vc_num) | |
1161 | return -EPERM; | |
1162 | return con_get_unimap(vc, tmp.entry_ct, &(user_ud->entry_ct), tmp_entries); | |
1163 | } | |
1164 | return 0; | |
1165 | } | |
1166 | ||
6caa76b7 | 1167 | long vt_compat_ioctl(struct tty_struct *tty, |
e9216651 AB |
1168 | unsigned int cmd, unsigned long arg) |
1169 | { | |
1170 | struct vc_data *vc = tty->driver_data; | |
1171 | struct console_font_op op; /* used in multiple places here */ | |
e9216651 AB |
1172 | unsigned int console; |
1173 | void __user *up = (void __user *)arg; | |
1174 | int perm; | |
1175 | int ret = 0; | |
1176 | ||
1177 | console = vc->vc_num; | |
1178 | ||
e9216651 AB |
1179 | if (!vc_cons_allocated(console)) { /* impossible? */ |
1180 | ret = -ENOIOCTLCMD; | |
1181 | goto out; | |
1182 | } | |
1183 | ||
1184 | /* | |
1185 | * To have permissions to do most of the vt ioctls, we either have | |
1186 | * to be the owner of the tty, or have CAP_SYS_TTY_CONFIG. | |
1187 | */ | |
1188 | perm = 0; | |
1189 | if (current->signal->tty == tty || capable(CAP_SYS_TTY_CONFIG)) | |
1190 | perm = 1; | |
1191 | ||
e9216651 AB |
1192 | switch (cmd) { |
1193 | /* | |
1194 | * these need special handlers for incompatible data structures | |
1195 | */ | |
1196 | case PIO_FONTX: | |
1197 | case GIO_FONTX: | |
1198 | ret = compat_fontx_ioctl(cmd, up, perm, &op); | |
1199 | break; | |
1200 | ||
1201 | case KDFONTOP: | |
1202 | ret = compat_kdfontop_ioctl(up, perm, &op, vc); | |
1203 | break; | |
1204 | ||
1205 | case PIO_UNIMAP: | |
1206 | case GIO_UNIMAP: | |
4b1fe779 | 1207 | ret = compat_unimap_ioctl(cmd, up, perm, vc); |
e9216651 AB |
1208 | break; |
1209 | ||
1210 | /* | |
1211 | * all these treat 'arg' as an integer | |
1212 | */ | |
1213 | case KIOCSOUND: | |
1214 | case KDMKTONE: | |
1215 | #ifdef CONFIG_X86 | |
1216 | case KDADDIO: | |
1217 | case KDDELIO: | |
1218 | #endif | |
1219 | case KDSETMODE: | |
1220 | case KDMAPDISP: | |
1221 | case KDUNMAPDISP: | |
1222 | case KDSKBMODE: | |
1223 | case KDSKBMETA: | |
1224 | case KDSKBLED: | |
1225 | case KDSETLED: | |
1226 | case KDSIGACCEPT: | |
1227 | case VT_ACTIVATE: | |
1228 | case VT_WAITACTIVE: | |
1229 | case VT_RELDISP: | |
1230 | case VT_DISALLOCATE: | |
1231 | case VT_RESIZE: | |
1232 | case VT_RESIZEX: | |
1233 | goto fallback; | |
1234 | ||
1235 | /* | |
1236 | * the rest has a compatible data structure behind arg, | |
1237 | * but we have to convert it to a proper 64 bit pointer. | |
1238 | */ | |
1239 | default: | |
1240 | arg = (unsigned long)compat_ptr(arg); | |
1241 | goto fallback; | |
1242 | } | |
1243 | out: | |
e9216651 AB |
1244 | return ret; |
1245 | ||
1246 | fallback: | |
6caa76b7 | 1247 | return vt_ioctl(tty, cmd, arg); |
e9216651 AB |
1248 | } |
1249 | ||
1250 | ||
1251 | #endif /* CONFIG_COMPAT */ | |
1252 | ||
1253 | ||
1da177e4 | 1254 | /* |
d3b5cffc AC |
1255 | * Performs the back end of a vt switch. Called under the console |
1256 | * semaphore. | |
1da177e4 LT |
1257 | */ |
1258 | static void complete_change_console(struct vc_data *vc) | |
1259 | { | |
1260 | unsigned char old_vc_mode; | |
8b92e87d | 1261 | int old = fg_console; |
1da177e4 LT |
1262 | |
1263 | last_console = fg_console; | |
1264 | ||
1265 | /* | |
1266 | * If we're switching, we could be going from KD_GRAPHICS to | |
1267 | * KD_TEXT mode or vice versa, which means we need to blank or | |
1268 | * unblank the screen later. | |
1269 | */ | |
1270 | old_vc_mode = vc_cons[fg_console].d->vc_mode; | |
1271 | switch_screen(vc); | |
1272 | ||
1273 | /* | |
3dfcaf16 | 1274 | * This can't appear below a successful kill_pid(). If it did, |
1da177e4 LT |
1275 | * then the *blank_screen operation could occur while X, having |
1276 | * received acqsig, is waking up on another processor. This | |
1277 | * condition can lead to overlapping accesses to the VGA range | |
1278 | * and the framebuffer (causing system lockups). | |
1279 | * | |
1280 | * To account for this we duplicate this code below only if the | |
1281 | * controlling process is gone and we've called reset_vc. | |
1282 | */ | |
1283 | if (old_vc_mode != vc->vc_mode) { | |
1284 | if (vc->vc_mode == KD_TEXT) | |
1285 | do_unblank_screen(1); | |
1286 | else | |
1287 | do_blank_screen(1); | |
1288 | } | |
1289 | ||
1290 | /* | |
1291 | * If this new console is under process control, send it a signal | |
1292 | * telling it that it has acquired. Also check if it has died and | |
1293 | * clean up (similar to logic employed in change_console()) | |
1294 | */ | |
87a6aca5 | 1295 | if (vc->vt_mode.mode == VT_PROCESS) { |
1da177e4 | 1296 | /* |
3dfcaf16 | 1297 | * Send the signal as privileged - kill_pid() will |
1da177e4 LT |
1298 | * tell us if the process has gone or something else |
1299 | * is awry | |
1300 | */ | |
bde0d2c9 | 1301 | if (kill_pid(vc->vt_pid, vc->vt_mode.acqsig, 1) != 0) { |
1da177e4 LT |
1302 | /* |
1303 | * The controlling process has died, so we revert back to | |
1304 | * normal operation. In this case, we'll also change back | |
1305 | * to KD_TEXT mode. I'm not sure if this is strictly correct | |
1306 | * but it saves the agony when the X server dies and the screen | |
1307 | * remains blanked due to KD_GRAPHICS! It would be nice to do | |
1308 | * this outside of VT_PROCESS but there is no single process | |
1309 | * to account for and tracking tty count may be undesirable. | |
1310 | */ | |
1311 | reset_vc(vc); | |
1312 | ||
1313 | if (old_vc_mode != vc->vc_mode) { | |
1314 | if (vc->vc_mode == KD_TEXT) | |
1315 | do_unblank_screen(1); | |
1316 | else | |
1317 | do_blank_screen(1); | |
1318 | } | |
1319 | } | |
1320 | } | |
1321 | ||
1322 | /* | |
1323 | * Wake anyone waiting for their VT to activate | |
1324 | */ | |
8b92e87d | 1325 | vt_event_post(VT_EVENT_SWITCH, old, vc->vc_num); |
1da177e4 LT |
1326 | return; |
1327 | } | |
1328 | ||
1329 | /* | |
1330 | * Performs the front-end of a vt switch | |
1331 | */ | |
1332 | void change_console(struct vc_data *new_vc) | |
1333 | { | |
1334 | struct vc_data *vc; | |
1335 | ||
1336 | if (!new_vc || new_vc->vc_num == fg_console || vt_dont_switch) | |
1337 | return; | |
1338 | ||
1339 | /* | |
1340 | * If this vt is in process mode, then we need to handshake with | |
1341 | * that process before switching. Essentially, we store where that | |
1342 | * vt wants to switch to and wait for it to tell us when it's done | |
1343 | * (via VT_RELDISP ioctl). | |
1344 | * | |
1345 | * We also check to see if the controlling process still exists. | |
1346 | * If it doesn't, we reset this vt to auto mode and continue. | |
1347 | * This is a cheap way to track process control. The worst thing | |
1348 | * that can happen is: we send a signal to a process, it dies, and | |
1349 | * the switch gets "lost" waiting for a response; hopefully, the | |
1350 | * user will try again, we'll detect the process is gone (unless | |
1351 | * the user waits just the right amount of time :-) and revert the | |
1352 | * vt to auto control. | |
1353 | */ | |
1354 | vc = vc_cons[fg_console].d; | |
87a6aca5 | 1355 | if (vc->vt_mode.mode == VT_PROCESS) { |
1da177e4 | 1356 | /* |
3dfcaf16 | 1357 | * Send the signal as privileged - kill_pid() will |
1da177e4 | 1358 | * tell us if the process has gone or something else |
a64314e6 JL |
1359 | * is awry. |
1360 | * | |
1361 | * We need to set vt_newvt *before* sending the signal or we | |
1362 | * have a race. | |
1da177e4 | 1363 | */ |
a64314e6 | 1364 | vc->vt_newvt = new_vc->vc_num; |
bde0d2c9 | 1365 | if (kill_pid(vc->vt_pid, vc->vt_mode.relsig, 1) == 0) { |
1da177e4 | 1366 | /* |
87a6aca5 GKH |
1367 | * It worked. Mark the vt to switch to and |
1368 | * return. The process needs to send us a | |
1369 | * VT_RELDISP ioctl to complete the switch. | |
1da177e4 | 1370 | */ |
87a6aca5 | 1371 | return; |
1da177e4 LT |
1372 | } |
1373 | ||
1374 | /* | |
87a6aca5 GKH |
1375 | * The controlling process has died, so we revert back to |
1376 | * normal operation. In this case, we'll also change back | |
1377 | * to KD_TEXT mode. I'm not sure if this is strictly correct | |
1378 | * but it saves the agony when the X server dies and the screen | |
1379 | * remains blanked due to KD_GRAPHICS! It would be nice to do | |
1380 | * this outside of VT_PROCESS but there is no single process | |
1381 | * to account for and tracking tty count may be undesirable. | |
1382 | */ | |
1383 | reset_vc(vc); | |
1384 | ||
1385 | /* | |
1386 | * Fall through to normal (VT_AUTO) handling of the switch... | |
1da177e4 LT |
1387 | */ |
1388 | } | |
1389 | ||
1390 | /* | |
1391 | * Ignore all switches in KD_GRAPHICS+VT_AUTO mode | |
1392 | */ | |
1393 | if (vc->vc_mode == KD_GRAPHICS) | |
1394 | return; | |
1395 | ||
1396 | complete_change_console(new_vc); | |
1397 | } | |
8d233558 AC |
1398 | |
1399 | /* Perform a kernel triggered VT switch for suspend/resume */ | |
1400 | ||
1401 | static int disable_vt_switch; | |
1402 | ||
1403 | int vt_move_to_console(unsigned int vt, int alloc) | |
1404 | { | |
1405 | int prev; | |
1406 | ||
ac751efa | 1407 | console_lock(); |
8d233558 AC |
1408 | /* Graphics mode - up to X */ |
1409 | if (disable_vt_switch) { | |
ac751efa | 1410 | console_unlock(); |
8d233558 AC |
1411 | return 0; |
1412 | } | |
1413 | prev = fg_console; | |
1414 | ||
1415 | if (alloc && vc_allocate(vt)) { | |
1416 | /* we can't have a free VC for now. Too bad, | |
1417 | * we don't want to mess the screen for now. */ | |
ac751efa | 1418 | console_unlock(); |
8d233558 AC |
1419 | return -ENOSPC; |
1420 | } | |
1421 | ||
1422 | if (set_console(vt)) { | |
1423 | /* | |
1424 | * We're unable to switch to the SUSPEND_CONSOLE. | |
1425 | * Let the calling function know so it can decide | |
1426 | * what to do. | |
1427 | */ | |
ac751efa | 1428 | console_unlock(); |
8d233558 AC |
1429 | return -EIO; |
1430 | } | |
ac751efa | 1431 | console_unlock(); |
797938b5 | 1432 | if (vt_waitactive(vt + 1)) { |
8d233558 AC |
1433 | pr_debug("Suspend: Can't switch VCs."); |
1434 | return -EINTR; | |
1435 | } | |
1436 | return prev; | |
1437 | } | |
1438 | ||
1439 | /* | |
1440 | * Normally during a suspend, we allocate a new console and switch to it. | |
1441 | * When we resume, we switch back to the original console. This switch | |
1442 | * can be slow, so on systems where the framebuffer can handle restoration | |
1443 | * of video registers anyways, there's little point in doing the console | |
1444 | * switch. This function allows you to disable it by passing it '0'. | |
1445 | */ | |
1446 | void pm_set_vt_switch(int do_switch) | |
1447 | { | |
ac751efa | 1448 | console_lock(); |
8d233558 | 1449 | disable_vt_switch = !do_switch; |
ac751efa | 1450 | console_unlock(); |
8d233558 AC |
1451 | } |
1452 | EXPORT_SYMBOL(pm_set_vt_switch); |