Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * linux/drivers/char/vt_ioctl.c | |
3 | * | |
4 | * Copyright (C) 1992 obz under the linux copyright | |
5 | * | |
6 | * Dynamic diacritical handling - aeb@cwi.nl - Dec 1993 | |
7 | * Dynamic keymap and string allocation - aeb@cwi.nl - May 1994 | |
8 | * Restrict VT switching via ioctl() - grif@cs.ucr.edu - Dec 1995 | |
9 | * Some code moved for less code duplication - Andi Kleen - Mar 1997 | |
10 | * Check put/get_user, cleanups - acme@conectiva.com.br - Jun 2001 | |
11 | */ | |
12 | ||
1da177e4 LT |
13 | #include <linux/types.h> |
14 | #include <linux/errno.h> | |
15 | #include <linux/sched.h> | |
16 | #include <linux/tty.h> | |
17 | #include <linux/timer.h> | |
18 | #include <linux/kernel.h> | |
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 | ||
63 | /* | |
64 | * these are the valid i/o ports we're allowed to change. they map all the | |
65 | * video ports | |
66 | */ | |
67 | #define GPFIRST 0x3b4 | |
68 | #define GPLAST 0x3df | |
69 | #define GPNUM (GPLAST - GPFIRST + 1) | |
70 | ||
71 | #define i (tmp.kb_index) | |
72 | #define s (tmp.kb_table) | |
73 | #define v (tmp.kb_value) | |
74 | static inline int | |
75 | do_kdsk_ioctl(int cmd, struct kbentry __user *user_kbe, int perm, struct kbd_struct *kbd) | |
76 | { | |
77 | struct kbentry tmp; | |
78 | ushort *key_map, val, ov; | |
79 | ||
80 | if (copy_from_user(&tmp, user_kbe, sizeof(struct kbentry))) | |
81 | return -EFAULT; | |
82 | ||
e3f17f0f MT |
83 | if (!capable(CAP_SYS_TTY_CONFIG)) |
84 | perm = 0; | |
85 | ||
1da177e4 LT |
86 | switch (cmd) { |
87 | case KDGKBENT: | |
88 | key_map = key_maps[s]; | |
89 | if (key_map) { | |
90 | val = U(key_map[i]); | |
91 | if (kbd->kbdmode != VC_UNICODE && KTYP(val) >= NR_TYPES) | |
92 | val = K_HOLE; | |
93 | } else | |
94 | val = (i ? K_HOLE : K_NOSUCHMAP); | |
95 | return put_user(val, &user_kbe->kb_value); | |
96 | case KDSKBENT: | |
97 | if (!perm) | |
98 | return -EPERM; | |
99 | if (!i && v == K_NOSUCHMAP) { | |
ca9bda00 | 100 | /* deallocate map */ |
1da177e4 LT |
101 | key_map = key_maps[s]; |
102 | if (s && key_map) { | |
103 | key_maps[s] = NULL; | |
104 | if (key_map[0] == U(K_ALLOCATED)) { | |
105 | kfree(key_map); | |
106 | keymap_count--; | |
107 | } | |
108 | } | |
109 | break; | |
110 | } | |
111 | ||
112 | if (KTYP(v) < NR_TYPES) { | |
113 | if (KVAL(v) > max_vals[KTYP(v)]) | |
114 | return -EINVAL; | |
115 | } else | |
116 | if (kbd->kbdmode != VC_UNICODE) | |
117 | return -EINVAL; | |
118 | ||
119 | /* ++Geert: non-PC keyboards may generate keycode zero */ | |
120 | #if !defined(__mc68000__) && !defined(__powerpc__) | |
121 | /* assignment to entry 0 only tests validity of args */ | |
122 | if (!i) | |
123 | break; | |
124 | #endif | |
125 | ||
126 | if (!(key_map = key_maps[s])) { | |
127 | int j; | |
128 | ||
129 | if (keymap_count >= MAX_NR_OF_USER_KEYMAPS && | |
130 | !capable(CAP_SYS_RESOURCE)) | |
131 | return -EPERM; | |
132 | ||
5cbded58 | 133 | key_map = kmalloc(sizeof(plain_map), |
1da177e4 LT |
134 | GFP_KERNEL); |
135 | if (!key_map) | |
136 | return -ENOMEM; | |
137 | key_maps[s] = key_map; | |
138 | key_map[0] = U(K_ALLOCATED); | |
139 | for (j = 1; j < NR_KEYS; j++) | |
140 | key_map[j] = U(K_HOLE); | |
141 | keymap_count++; | |
142 | } | |
143 | ov = U(key_map[i]); | |
144 | if (v == ov) | |
145 | break; /* nothing to do */ | |
146 | /* | |
147 | * Attention Key. | |
148 | */ | |
149 | if (((ov == K_SAK) || (v == K_SAK)) && !capable(CAP_SYS_ADMIN)) | |
150 | return -EPERM; | |
151 | key_map[i] = U(v); | |
152 | if (!s && (KTYP(ov) == KT_SHIFT || KTYP(v) == KT_SHIFT)) | |
153 | compute_shiftstate(); | |
154 | break; | |
155 | } | |
156 | return 0; | |
157 | } | |
158 | #undef i | |
159 | #undef s | |
160 | #undef v | |
161 | ||
162 | static inline int | |
163 | do_kbkeycode_ioctl(int cmd, struct kbkeycode __user *user_kbkc, int perm) | |
164 | { | |
165 | struct kbkeycode tmp; | |
166 | int kc = 0; | |
167 | ||
168 | if (copy_from_user(&tmp, user_kbkc, sizeof(struct kbkeycode))) | |
169 | return -EFAULT; | |
170 | switch (cmd) { | |
171 | case KDGETKEYCODE: | |
172 | kc = getkeycode(tmp.scancode); | |
173 | if (kc >= 0) | |
174 | kc = put_user(kc, &user_kbkc->keycode); | |
175 | break; | |
176 | case KDSETKEYCODE: | |
177 | if (!perm) | |
178 | return -EPERM; | |
179 | kc = setkeycode(tmp.scancode, tmp.keycode); | |
180 | break; | |
181 | } | |
182 | return kc; | |
183 | } | |
184 | ||
185 | static inline int | |
186 | do_kdgkb_ioctl(int cmd, struct kbsentry __user *user_kdgkb, int perm) | |
187 | { | |
188 | struct kbsentry *kbs; | |
189 | char *p; | |
190 | u_char *q; | |
191 | u_char __user *up; | |
192 | int sz; | |
193 | int delta; | |
194 | char *first_free, *fj, *fnw; | |
195 | int i, j, k; | |
196 | int ret; | |
197 | ||
0b360adb | 198 | if (!capable(CAP_SYS_TTY_CONFIG)) |
e3f17f0f | 199 | perm = 0; |
0b360adb | 200 | |
1da177e4 LT |
201 | kbs = kmalloc(sizeof(*kbs), GFP_KERNEL); |
202 | if (!kbs) { | |
203 | ret = -ENOMEM; | |
204 | goto reterr; | |
205 | } | |
206 | ||
207 | /* we mostly copy too much here (512bytes), but who cares ;) */ | |
208 | if (copy_from_user(kbs, user_kdgkb, sizeof(struct kbsentry))) { | |
209 | ret = -EFAULT; | |
210 | goto reterr; | |
211 | } | |
212 | kbs->kb_string[sizeof(kbs->kb_string)-1] = '\0'; | |
213 | i = kbs->kb_func; | |
214 | ||
215 | switch (cmd) { | |
216 | case KDGKBSENT: | |
217 | sz = sizeof(kbs->kb_string) - 1; /* sz should have been | |
218 | a struct member */ | |
219 | up = user_kdgkb->kb_string; | |
220 | p = func_table[i]; | |
221 | if(p) | |
222 | for ( ; *p && sz; p++, sz--) | |
223 | if (put_user(*p, up++)) { | |
224 | ret = -EFAULT; | |
225 | goto reterr; | |
226 | } | |
227 | if (put_user('\0', up)) { | |
228 | ret = -EFAULT; | |
229 | goto reterr; | |
230 | } | |
231 | kfree(kbs); | |
232 | return ((p && *p) ? -EOVERFLOW : 0); | |
233 | case KDSKBSENT: | |
234 | if (!perm) { | |
235 | ret = -EPERM; | |
236 | goto reterr; | |
237 | } | |
238 | ||
239 | q = func_table[i]; | |
240 | first_free = funcbufptr + (funcbufsize - funcbufleft); | |
241 | for (j = i+1; j < MAX_NR_FUNC && !func_table[j]; j++) | |
242 | ; | |
243 | if (j < MAX_NR_FUNC) | |
244 | fj = func_table[j]; | |
245 | else | |
246 | fj = first_free; | |
247 | ||
248 | delta = (q ? -strlen(q) : 1) + strlen(kbs->kb_string); | |
249 | if (delta <= funcbufleft) { /* it fits in current buf */ | |
250 | if (j < MAX_NR_FUNC) { | |
251 | memmove(fj + delta, fj, first_free - fj); | |
252 | for (k = j; k < MAX_NR_FUNC; k++) | |
253 | if (func_table[k]) | |
254 | func_table[k] += delta; | |
255 | } | |
256 | if (!q) | |
257 | func_table[i] = fj; | |
258 | funcbufleft -= delta; | |
259 | } else { /* allocate a larger buffer */ | |
260 | sz = 256; | |
261 | while (sz < funcbufsize - funcbufleft + delta) | |
262 | sz <<= 1; | |
5cbded58 | 263 | fnw = kmalloc(sz, GFP_KERNEL); |
1da177e4 LT |
264 | if(!fnw) { |
265 | ret = -ENOMEM; | |
266 | goto reterr; | |
267 | } | |
268 | ||
269 | if (!q) | |
270 | func_table[i] = fj; | |
271 | if (fj > funcbufptr) | |
272 | memmove(fnw, funcbufptr, fj - funcbufptr); | |
273 | for (k = 0; k < j; k++) | |
274 | if (func_table[k]) | |
275 | func_table[k] = fnw + (func_table[k] - funcbufptr); | |
276 | ||
277 | if (first_free > fj) { | |
278 | memmove(fnw + (fj - funcbufptr) + delta, fj, first_free - fj); | |
279 | for (k = j; k < MAX_NR_FUNC; k++) | |
280 | if (func_table[k]) | |
281 | func_table[k] = fnw + (func_table[k] - funcbufptr) + delta; | |
282 | } | |
283 | if (funcbufptr != func_buf) | |
284 | kfree(funcbufptr); | |
285 | funcbufptr = fnw; | |
286 | funcbufleft = funcbufleft - delta + sz - funcbufsize; | |
287 | funcbufsize = sz; | |
288 | } | |
289 | strcpy(func_table[i], kbs->kb_string); | |
290 | break; | |
291 | } | |
292 | ret = 0; | |
293 | reterr: | |
294 | kfree(kbs); | |
295 | return ret; | |
296 | } | |
297 | ||
298 | static inline int | |
299 | do_fontx_ioctl(int cmd, struct consolefontdesc __user *user_cfd, int perm, struct console_font_op *op) | |
300 | { | |
301 | struct consolefontdesc cfdarg; | |
302 | int i; | |
303 | ||
304 | if (copy_from_user(&cfdarg, user_cfd, sizeof(struct consolefontdesc))) | |
305 | return -EFAULT; | |
306 | ||
307 | switch (cmd) { | |
308 | case PIO_FONTX: | |
309 | if (!perm) | |
310 | return -EPERM; | |
311 | op->op = KD_FONT_OP_SET; | |
312 | op->flags = KD_FONT_FLAG_OLD; | |
313 | op->width = 8; | |
314 | op->height = cfdarg.charheight; | |
315 | op->charcount = cfdarg.charcount; | |
316 | op->data = cfdarg.chardata; | |
317 | return con_font_op(vc_cons[fg_console].d, op); | |
318 | case GIO_FONTX: { | |
319 | op->op = KD_FONT_OP_GET; | |
320 | op->flags = KD_FONT_FLAG_OLD; | |
321 | op->width = 8; | |
322 | op->height = cfdarg.charheight; | |
323 | op->charcount = cfdarg.charcount; | |
324 | op->data = cfdarg.chardata; | |
325 | i = con_font_op(vc_cons[fg_console].d, op); | |
326 | if (i) | |
327 | return i; | |
328 | cfdarg.charheight = op->height; | |
329 | cfdarg.charcount = op->charcount; | |
330 | if (copy_to_user(user_cfd, &cfdarg, sizeof(struct consolefontdesc))) | |
331 | return -EFAULT; | |
332 | return 0; | |
333 | } | |
334 | } | |
335 | return -EINVAL; | |
336 | } | |
337 | ||
338 | static inline int | |
339 | do_unimap_ioctl(int cmd, struct unimapdesc __user *user_ud, int perm, struct vc_data *vc) | |
340 | { | |
341 | struct unimapdesc tmp; | |
342 | ||
343 | if (copy_from_user(&tmp, user_ud, sizeof tmp)) | |
344 | return -EFAULT; | |
345 | if (tmp.entries) | |
346 | if (!access_ok(VERIFY_WRITE, tmp.entries, | |
347 | tmp.entry_ct*sizeof(struct unipair))) | |
348 | return -EFAULT; | |
349 | switch (cmd) { | |
350 | case PIO_UNIMAP: | |
351 | if (!perm) | |
352 | return -EPERM; | |
353 | return con_set_unimap(vc, tmp.entry_ct, tmp.entries); | |
354 | case GIO_UNIMAP: | |
355 | if (!perm && fg_console != vc->vc_num) | |
356 | return -EPERM; | |
357 | return con_get_unimap(vc, tmp.entry_ct, &(user_ud->entry_ct), tmp.entries); | |
358 | } | |
359 | return 0; | |
360 | } | |
361 | ||
362 | /* | |
363 | * We handle the console-specific ioctl's here. We allow the | |
364 | * capability to modify any console, not just the fg_console. | |
365 | */ | |
366 | int vt_ioctl(struct tty_struct *tty, struct file * file, | |
367 | unsigned int cmd, unsigned long arg) | |
368 | { | |
369 | struct vc_data *vc = (struct vc_data *)tty->driver_data; | |
370 | struct console_font_op op; /* used in multiple places here */ | |
371 | struct kbd_struct * kbd; | |
372 | unsigned int console; | |
373 | unsigned char ucval; | |
374 | void __user *up = (void __user *)arg; | |
375 | int i, perm; | |
9cc3c22b AC |
376 | int ret = 0; |
377 | ||
1da177e4 LT |
378 | console = vc->vc_num; |
379 | ||
9cc3c22b AC |
380 | lock_kernel(); |
381 | ||
382 | if (!vc_cons_allocated(console)) { /* impossible? */ | |
383 | ret = -ENOIOCTLCMD; | |
384 | goto out; | |
385 | } | |
386 | ||
1da177e4 LT |
387 | |
388 | /* | |
389 | * To have permissions to do most of the vt ioctls, we either have | |
390 | * to be the owner of the tty, or have CAP_SYS_TTY_CONFIG. | |
391 | */ | |
392 | perm = 0; | |
393 | if (current->signal->tty == tty || capable(CAP_SYS_TTY_CONFIG)) | |
394 | perm = 1; | |
395 | ||
396 | kbd = kbd_table + console; | |
397 | switch (cmd) { | |
398 | case KIOCSOUND: | |
399 | if (!perm) | |
9cc3c22b | 400 | goto eperm; |
1da177e4 | 401 | if (arg) |
bcc8ca09 | 402 | arg = CLOCK_TICK_RATE / arg; |
1da177e4 | 403 | kd_mksound(arg, 0); |
9cc3c22b | 404 | break; |
1da177e4 LT |
405 | |
406 | case KDMKTONE: | |
407 | if (!perm) | |
9cc3c22b | 408 | goto eperm; |
1da177e4 LT |
409 | { |
410 | unsigned int ticks, count; | |
411 | ||
412 | /* | |
413 | * Generate the tone for the appropriate number of ticks. | |
414 | * If the time is zero, turn off sound ourselves. | |
415 | */ | |
416 | ticks = HZ * ((arg >> 16) & 0xffff) / 1000; | |
417 | count = ticks ? (arg & 0xffff) : 0; | |
418 | if (count) | |
bcc8ca09 | 419 | count = CLOCK_TICK_RATE / count; |
1da177e4 | 420 | kd_mksound(count, ticks); |
9cc3c22b | 421 | break; |
1da177e4 LT |
422 | } |
423 | ||
424 | case KDGKBTYPE: | |
425 | /* | |
426 | * this is naive. | |
427 | */ | |
428 | ucval = KB_101; | |
429 | goto setchar; | |
430 | ||
431 | /* | |
432 | * These cannot be implemented on any machine that implements | |
433 | * ioperm() in user level (such as Alpha PCs) or not at all. | |
434 | * | |
435 | * XXX: you should never use these, just call ioperm directly.. | |
436 | */ | |
437 | #ifdef CONFIG_X86 | |
438 | case KDADDIO: | |
439 | case KDDELIO: | |
440 | /* | |
441 | * KDADDIO and KDDELIO may be able to add ports beyond what | |
442 | * we reject here, but to be safe... | |
443 | */ | |
9cc3c22b AC |
444 | if (arg < GPFIRST || arg > GPLAST) { |
445 | ret = -EINVAL; | |
446 | break; | |
447 | } | |
448 | ret = sys_ioperm(arg, 1, (cmd == KDADDIO)) ? -ENXIO : 0; | |
449 | break; | |
1da177e4 LT |
450 | |
451 | case KDENABIO: | |
452 | case KDDISABIO: | |
9cc3c22b | 453 | ret = sys_ioperm(GPFIRST, GPNUM, |
1da177e4 | 454 | (cmd == KDENABIO)) ? -ENXIO : 0; |
9cc3c22b | 455 | break; |
1da177e4 LT |
456 | #endif |
457 | ||
458 | /* Linux m68k/i386 interface for setting the keyboard delay/repeat rate */ | |
459 | ||
460 | case KDKBDREP: | |
461 | { | |
462 | struct kbd_repeat kbrep; | |
1da177e4 LT |
463 | |
464 | if (!capable(CAP_SYS_TTY_CONFIG)) | |
9cc3c22b | 465 | goto eperm; |
1da177e4 | 466 | |
9cc3c22b AC |
467 | if (copy_from_user(&kbrep, up, sizeof(struct kbd_repeat))) { |
468 | ret = -EFAULT; | |
469 | break; | |
470 | } | |
471 | ret = kbd_rate(&kbrep); | |
472 | if (ret) | |
473 | break; | |
1da177e4 | 474 | if (copy_to_user(up, &kbrep, sizeof(struct kbd_repeat))) |
9cc3c22b AC |
475 | ret = -EFAULT; |
476 | break; | |
1da177e4 LT |
477 | } |
478 | ||
479 | case KDSETMODE: | |
480 | /* | |
481 | * currently, setting the mode from KD_TEXT to KD_GRAPHICS | |
482 | * doesn't do a whole lot. i'm not sure if it should do any | |
483 | * restoration of modes or what... | |
484 | * | |
485 | * XXX It should at least call into the driver, fbdev's definitely | |
486 | * need to restore their engine state. --BenH | |
487 | */ | |
488 | if (!perm) | |
9cc3c22b | 489 | goto eperm; |
1da177e4 LT |
490 | switch (arg) { |
491 | case KD_GRAPHICS: | |
492 | break; | |
493 | case KD_TEXT0: | |
494 | case KD_TEXT1: | |
495 | arg = KD_TEXT; | |
496 | case KD_TEXT: | |
497 | break; | |
498 | default: | |
9cc3c22b AC |
499 | ret = -EINVAL; |
500 | goto out; | |
1da177e4 LT |
501 | } |
502 | if (vc->vc_mode == (unsigned char) arg) | |
9cc3c22b | 503 | break; |
1da177e4 LT |
504 | vc->vc_mode = (unsigned char) arg; |
505 | if (console != fg_console) | |
9cc3c22b | 506 | break; |
1da177e4 LT |
507 | /* |
508 | * explicitly blank/unblank the screen if switching modes | |
509 | */ | |
510 | acquire_console_sem(); | |
511 | if (arg == KD_TEXT) | |
512 | do_unblank_screen(1); | |
513 | else | |
514 | do_blank_screen(1); | |
515 | release_console_sem(); | |
9cc3c22b | 516 | break; |
1da177e4 LT |
517 | |
518 | case KDGETMODE: | |
519 | ucval = vc->vc_mode; | |
520 | goto setint; | |
521 | ||
522 | case KDMAPDISP: | |
523 | case KDUNMAPDISP: | |
524 | /* | |
525 | * these work like a combination of mmap and KDENABIO. | |
526 | * this could be easily finished. | |
527 | */ | |
9cc3c22b AC |
528 | ret = -EINVAL; |
529 | break; | |
1da177e4 LT |
530 | |
531 | case KDSKBMODE: | |
532 | if (!perm) | |
9cc3c22b | 533 | goto eperm; |
1da177e4 LT |
534 | switch(arg) { |
535 | case K_RAW: | |
536 | kbd->kbdmode = VC_RAW; | |
537 | break; | |
538 | case K_MEDIUMRAW: | |
539 | kbd->kbdmode = VC_MEDIUMRAW; | |
540 | break; | |
541 | case K_XLATE: | |
542 | kbd->kbdmode = VC_XLATE; | |
543 | compute_shiftstate(); | |
544 | break; | |
545 | case K_UNICODE: | |
546 | kbd->kbdmode = VC_UNICODE; | |
547 | compute_shiftstate(); | |
548 | break; | |
549 | default: | |
9cc3c22b AC |
550 | ret = -EINVAL; |
551 | goto out; | |
1da177e4 LT |
552 | } |
553 | tty_ldisc_flush(tty); | |
9cc3c22b | 554 | break; |
1da177e4 LT |
555 | |
556 | case KDGKBMODE: | |
557 | ucval = ((kbd->kbdmode == VC_RAW) ? K_RAW : | |
558 | (kbd->kbdmode == VC_MEDIUMRAW) ? K_MEDIUMRAW : | |
559 | (kbd->kbdmode == VC_UNICODE) ? K_UNICODE : | |
560 | K_XLATE); | |
561 | goto setint; | |
562 | ||
563 | /* this could be folded into KDSKBMODE, but for compatibility | |
564 | reasons it is not so easy to fold KDGKBMETA into KDGKBMODE */ | |
565 | case KDSKBMETA: | |
566 | switch(arg) { | |
567 | case K_METABIT: | |
568 | clr_vc_kbd_mode(kbd, VC_META); | |
569 | break; | |
570 | case K_ESCPREFIX: | |
571 | set_vc_kbd_mode(kbd, VC_META); | |
572 | break; | |
573 | default: | |
9cc3c22b | 574 | ret = -EINVAL; |
1da177e4 | 575 | } |
9cc3c22b | 576 | break; |
1da177e4 LT |
577 | |
578 | case KDGKBMETA: | |
579 | ucval = (vc_kbd_mode(kbd, VC_META) ? K_ESCPREFIX : K_METABIT); | |
580 | setint: | |
9cc3c22b AC |
581 | ret = put_user(ucval, (int __user *)arg); |
582 | break; | |
1da177e4 LT |
583 | |
584 | case KDGETKEYCODE: | |
585 | case KDSETKEYCODE: | |
586 | if(!capable(CAP_SYS_TTY_CONFIG)) | |
9cc3c22b AC |
587 | perm = 0; |
588 | ret = do_kbkeycode_ioctl(cmd, up, perm); | |
589 | break; | |
1da177e4 LT |
590 | |
591 | case KDGKBENT: | |
592 | case KDSKBENT: | |
9cc3c22b AC |
593 | ret = do_kdsk_ioctl(cmd, up, perm, kbd); |
594 | break; | |
1da177e4 LT |
595 | |
596 | case KDGKBSENT: | |
597 | case KDSKBSENT: | |
9cc3c22b AC |
598 | ret = do_kdgkb_ioctl(cmd, up, perm); |
599 | break; | |
1da177e4 LT |
600 | |
601 | case KDGKBDIACR: | |
602 | { | |
603 | struct kbdiacrs __user *a = up; | |
04c71976 ST |
604 | struct kbdiacr diacr; |
605 | int i; | |
1da177e4 | 606 | |
9cc3c22b AC |
607 | if (put_user(accent_table_size, &a->kb_cnt)) { |
608 | ret = -EFAULT; | |
609 | break; | |
610 | } | |
04c71976 ST |
611 | for (i = 0; i < accent_table_size; i++) { |
612 | diacr.diacr = conv_uni_to_8bit(accent_table[i].diacr); | |
613 | diacr.base = conv_uni_to_8bit(accent_table[i].base); | |
614 | diacr.result = conv_uni_to_8bit(accent_table[i].result); | |
9cc3c22b AC |
615 | if (copy_to_user(a->kbdiacr + i, &diacr, sizeof(struct kbdiacr))) { |
616 | ret = -EFAULT; | |
617 | break; | |
618 | } | |
04c71976 | 619 | } |
9cc3c22b | 620 | break; |
04c71976 ST |
621 | } |
622 | case KDGKBDIACRUC: | |
623 | { | |
624 | struct kbdiacrsuc __user *a = up; | |
625 | ||
626 | if (put_user(accent_table_size, &a->kb_cnt)) | |
9cc3c22b AC |
627 | ret = -EFAULT; |
628 | else if (copy_to_user(a->kbdiacruc, accent_table, | |
629 | accent_table_size*sizeof(struct kbdiacruc))) | |
630 | ret = -EFAULT; | |
631 | break; | |
1da177e4 LT |
632 | } |
633 | ||
634 | case KDSKBDIACR: | |
635 | { | |
636 | struct kbdiacrs __user *a = up; | |
04c71976 ST |
637 | struct kbdiacr diacr; |
638 | unsigned int ct; | |
639 | int i; | |
640 | ||
641 | if (!perm) | |
9cc3c22b AC |
642 | goto eperm; |
643 | if (get_user(ct,&a->kb_cnt)) { | |
644 | ret = -EFAULT; | |
645 | break; | |
646 | } | |
647 | if (ct >= MAX_DIACR) { | |
648 | ret = -EINVAL; | |
649 | break; | |
650 | } | |
04c71976 ST |
651 | accent_table_size = ct; |
652 | for (i = 0; i < ct; i++) { | |
9cc3c22b AC |
653 | if (copy_from_user(&diacr, a->kbdiacr + i, sizeof(struct kbdiacr))) { |
654 | ret = -EFAULT; | |
655 | break; | |
656 | } | |
04c71976 ST |
657 | accent_table[i].diacr = conv_8bit_to_uni(diacr.diacr); |
658 | accent_table[i].base = conv_8bit_to_uni(diacr.base); | |
659 | accent_table[i].result = conv_8bit_to_uni(diacr.result); | |
660 | } | |
9cc3c22b | 661 | break; |
04c71976 ST |
662 | } |
663 | ||
664 | case KDSKBDIACRUC: | |
665 | { | |
666 | struct kbdiacrsuc __user *a = up; | |
1da177e4 LT |
667 | unsigned int ct; |
668 | ||
669 | if (!perm) | |
9cc3c22b AC |
670 | goto eperm; |
671 | if (get_user(ct,&a->kb_cnt)) { | |
672 | ret = -EFAULT; | |
673 | break; | |
674 | } | |
675 | if (ct >= MAX_DIACR) { | |
676 | ret = -EINVAL; | |
677 | break; | |
678 | } | |
1da177e4 | 679 | accent_table_size = ct; |
04c71976 | 680 | if (copy_from_user(accent_table, a->kbdiacruc, ct*sizeof(struct kbdiacruc))) |
9cc3c22b AC |
681 | ret = -EFAULT; |
682 | break; | |
1da177e4 LT |
683 | } |
684 | ||
685 | /* the ioctls below read/set the flags usually shown in the leds */ | |
686 | /* don't use them - they will go away without warning */ | |
687 | case KDGKBLED: | |
688 | ucval = kbd->ledflagstate | (kbd->default_ledflagstate << 4); | |
689 | goto setchar; | |
690 | ||
691 | case KDSKBLED: | |
692 | if (!perm) | |
9cc3c22b AC |
693 | goto eperm; |
694 | if (arg & ~0x77) { | |
695 | ret = -EINVAL; | |
696 | break; | |
697 | } | |
1da177e4 LT |
698 | kbd->ledflagstate = (arg & 7); |
699 | kbd->default_ledflagstate = ((arg >> 4) & 7); | |
700 | set_leds(); | |
9cc3c22b | 701 | break; |
1da177e4 LT |
702 | |
703 | /* the ioctls below only set the lights, not the functions */ | |
704 | /* for those, see KDGKBLED and KDSKBLED above */ | |
705 | case KDGETLED: | |
706 | ucval = getledstate(); | |
707 | setchar: | |
9cc3c22b AC |
708 | ret = put_user(ucval, (char __user *)arg); |
709 | break; | |
1da177e4 LT |
710 | |
711 | case KDSETLED: | |
712 | if (!perm) | |
9cc3c22b | 713 | goto eperm; |
1da177e4 | 714 | setledstate(kbd, arg); |
9cc3c22b | 715 | break; |
1da177e4 LT |
716 | |
717 | /* | |
718 | * A process can indicate its willingness to accept signals | |
719 | * generated by pressing an appropriate key combination. | |
720 | * Thus, one can have a daemon that e.g. spawns a new console | |
721 | * upon a keypress and then changes to it. | |
722 | * See also the kbrequest field of inittab(5). | |
723 | */ | |
724 | case KDSIGACCEPT: | |
725 | { | |
1da177e4 | 726 | if (!perm || !capable(CAP_KILL)) |
9cc3c22b | 727 | goto eperm; |
7ed20e1a | 728 | if (!valid_signal(arg) || arg < 1 || arg == SIGKILL) |
9cc3c22b AC |
729 | ret = -EINVAL; |
730 | else { | |
731 | spin_lock_irq(&vt_spawn_con.lock); | |
732 | put_pid(vt_spawn_con.pid); | |
733 | vt_spawn_con.pid = get_pid(task_pid(current)); | |
734 | vt_spawn_con.sig = arg; | |
735 | spin_unlock_irq(&vt_spawn_con.lock); | |
736 | } | |
737 | break; | |
1da177e4 LT |
738 | } |
739 | ||
740 | case VT_SETMODE: | |
741 | { | |
742 | struct vt_mode tmp; | |
743 | ||
744 | if (!perm) | |
9cc3c22b AC |
745 | goto eperm; |
746 | if (copy_from_user(&tmp, up, sizeof(struct vt_mode))) { | |
747 | ret = -EFAULT; | |
748 | goto out; | |
749 | } | |
750 | if (tmp.mode != VT_AUTO && tmp.mode != VT_PROCESS) { | |
751 | ret = -EINVAL; | |
752 | goto out; | |
753 | } | |
1da177e4 LT |
754 | acquire_console_sem(); |
755 | vc->vt_mode = tmp; | |
756 | /* the frsig is ignored, so we set it to 0 */ | |
757 | vc->vt_mode.frsig = 0; | |
8b6312f4 EB |
758 | put_pid(vc->vt_pid); |
759 | vc->vt_pid = get_pid(task_pid(current)); | |
1da177e4 LT |
760 | /* no switch is required -- saw@shade.msu.ru */ |
761 | vc->vt_newvt = -1; | |
762 | release_console_sem(); | |
9cc3c22b | 763 | break; |
1da177e4 LT |
764 | } |
765 | ||
766 | case VT_GETMODE: | |
767 | { | |
768 | struct vt_mode tmp; | |
769 | int rc; | |
770 | ||
771 | acquire_console_sem(); | |
772 | memcpy(&tmp, &vc->vt_mode, sizeof(struct vt_mode)); | |
773 | release_console_sem(); | |
774 | ||
775 | rc = copy_to_user(up, &tmp, sizeof(struct vt_mode)); | |
9cc3c22b AC |
776 | if (rc) |
777 | ret = -EFAULT; | |
778 | break; | |
1da177e4 LT |
779 | } |
780 | ||
781 | /* | |
782 | * Returns global vt state. Note that VT 0 is always open, since | |
783 | * it's an alias for the current VT, and people can't use it here. | |
784 | * We cannot return state for more than 16 VTs, since v_state is short. | |
785 | */ | |
786 | case VT_GETSTATE: | |
787 | { | |
788 | struct vt_stat __user *vtstat = up; | |
789 | unsigned short state, mask; | |
790 | ||
791 | if (put_user(fg_console + 1, &vtstat->v_active)) | |
9cc3c22b AC |
792 | ret = -EFAULT; |
793 | else { | |
794 | state = 1; /* /dev/tty0 is always open */ | |
795 | for (i = 0, mask = 2; i < MAX_NR_CONSOLES && mask; | |
796 | ++i, mask <<= 1) | |
797 | if (VT_IS_IN_USE(i)) | |
798 | state |= mask; | |
799 | ret = put_user(state, &vtstat->v_state); | |
800 | } | |
801 | break; | |
1da177e4 LT |
802 | } |
803 | ||
804 | /* | |
805 | * Returns the first available (non-opened) console. | |
806 | */ | |
807 | case VT_OPENQRY: | |
808 | for (i = 0; i < MAX_NR_CONSOLES; ++i) | |
809 | if (! VT_IS_IN_USE(i)) | |
810 | break; | |
811 | ucval = i < MAX_NR_CONSOLES ? (i+1) : -1; | |
812 | goto setint; | |
813 | ||
814 | /* | |
815 | * ioctl(fd, VT_ACTIVATE, num) will cause us to switch to vt # num, | |
816 | * with num >= 1 (switches to vt 0, our console, are not allowed, just | |
817 | * to preserve sanity). | |
818 | */ | |
819 | case VT_ACTIVATE: | |
820 | if (!perm) | |
9cc3c22b | 821 | goto eperm; |
1da177e4 | 822 | if (arg == 0 || arg > MAX_NR_CONSOLES) |
9cc3c22b AC |
823 | ret = -ENXIO; |
824 | else { | |
825 | arg--; | |
826 | acquire_console_sem(); | |
827 | ret = vc_allocate(arg); | |
828 | release_console_sem(); | |
829 | if (ret) | |
830 | break; | |
831 | set_console(arg); | |
832 | } | |
833 | break; | |
1da177e4 LT |
834 | |
835 | /* | |
836 | * wait until the specified VT has been activated | |
837 | */ | |
838 | case VT_WAITACTIVE: | |
839 | if (!perm) | |
9cc3c22b | 840 | goto eperm; |
1da177e4 | 841 | if (arg == 0 || arg > MAX_NR_CONSOLES) |
9cc3c22b AC |
842 | ret = -ENXIO; |
843 | else | |
844 | ret = vt_waitactive(arg - 1); | |
845 | break; | |
1da177e4 LT |
846 | |
847 | /* | |
848 | * If a vt is under process control, the kernel will not switch to it | |
849 | * immediately, but postpone the operation until the process calls this | |
850 | * ioctl, allowing the switch to complete. | |
851 | * | |
852 | * According to the X sources this is the behavior: | |
853 | * 0: pending switch-from not OK | |
854 | * 1: pending switch-from OK | |
855 | * 2: completed switch-to OK | |
856 | */ | |
857 | case VT_RELDISP: | |
858 | if (!perm) | |
9cc3c22b | 859 | goto eperm; |
1da177e4 | 860 | |
9cc3c22b AC |
861 | if (vc->vt_mode.mode != VT_PROCESS) { |
862 | ret = -EINVAL; | |
863 | break; | |
864 | } | |
1da177e4 LT |
865 | /* |
866 | * Switching-from response | |
867 | */ | |
8792f961 | 868 | acquire_console_sem(); |
1da177e4 LT |
869 | if (vc->vt_newvt >= 0) { |
870 | if (arg == 0) | |
871 | /* | |
872 | * Switch disallowed, so forget we were trying | |
873 | * to do it. | |
874 | */ | |
875 | vc->vt_newvt = -1; | |
876 | ||
877 | else { | |
878 | /* | |
879 | * The current vt has been released, so | |
880 | * complete the switch. | |
881 | */ | |
882 | int newvt; | |
1da177e4 LT |
883 | newvt = vc->vt_newvt; |
884 | vc->vt_newvt = -1; | |
9cc3c22b AC |
885 | ret = vc_allocate(newvt); |
886 | if (ret) { | |
1da177e4 | 887 | release_console_sem(); |
9cc3c22b | 888 | break; |
1da177e4 LT |
889 | } |
890 | /* | |
891 | * When we actually do the console switch, | |
892 | * make sure we are atomic with respect to | |
893 | * other console switches.. | |
894 | */ | |
895 | complete_change_console(vc_cons[newvt].d); | |
1da177e4 | 896 | } |
9cc3c22b AC |
897 | } else { |
898 | /* | |
899 | * Switched-to response | |
900 | */ | |
1da177e4 LT |
901 | /* |
902 | * If it's just an ACK, ignore it | |
903 | */ | |
9cc3c22b AC |
904 | if (arg != VT_ACKACQ) |
905 | ret = -EINVAL; | |
1da177e4 | 906 | } |
8792f961 | 907 | release_console_sem(); |
9cc3c22b | 908 | break; |
1da177e4 LT |
909 | |
910 | /* | |
911 | * Disallocate memory associated to VT (but leave VT1) | |
912 | */ | |
913 | case VT_DISALLOCATE: | |
9cc3c22b AC |
914 | if (arg > MAX_NR_CONSOLES) { |
915 | ret = -ENXIO; | |
916 | break; | |
917 | } | |
1da177e4 | 918 | if (arg == 0) { |
ca9bda00 | 919 | /* deallocate all unused consoles, but leave 0 */ |
1da177e4 LT |
920 | acquire_console_sem(); |
921 | for (i=1; i<MAX_NR_CONSOLES; i++) | |
922 | if (! VT_BUSY(i)) | |
ca9bda00 | 923 | vc_deallocate(i); |
1da177e4 LT |
924 | release_console_sem(); |
925 | } else { | |
ca9bda00 | 926 | /* deallocate a single console, if possible */ |
1da177e4 LT |
927 | arg--; |
928 | if (VT_BUSY(arg)) | |
9cc3c22b AC |
929 | ret = -EBUSY; |
930 | else if (arg) { /* leave 0 */ | |
1da177e4 | 931 | acquire_console_sem(); |
ca9bda00 | 932 | vc_deallocate(arg); |
1da177e4 LT |
933 | release_console_sem(); |
934 | } | |
935 | } | |
9cc3c22b | 936 | break; |
1da177e4 LT |
937 | |
938 | case VT_RESIZE: | |
939 | { | |
940 | struct vt_sizes __user *vtsizes = up; | |
e400b6ec AD |
941 | struct vc_data *vc; |
942 | ||
1da177e4 LT |
943 | ushort ll,cc; |
944 | if (!perm) | |
9cc3c22b | 945 | goto eperm; |
1da177e4 LT |
946 | if (get_user(ll, &vtsizes->v_rows) || |
947 | get_user(cc, &vtsizes->v_cols)) | |
9cc3c22b AC |
948 | ret = -EFAULT; |
949 | else { | |
950 | for (i = 0; i < MAX_NR_CONSOLES; i++) { | |
951 | vc = vc_cons[i].d; | |
e400b6ec | 952 | |
9cc3c22b AC |
953 | if (vc) { |
954 | vc->vc_resize_user = 1; | |
955 | vc_lock_resize(vc_cons[i].d, cc, ll); | |
956 | } | |
e400b6ec AD |
957 | } |
958 | } | |
9cc3c22b | 959 | break; |
1da177e4 LT |
960 | } |
961 | ||
962 | case VT_RESIZEX: | |
963 | { | |
964 | struct vt_consize __user *vtconsize = up; | |
965 | ushort ll,cc,vlin,clin,vcol,ccol; | |
966 | if (!perm) | |
9cc3c22b | 967 | goto eperm; |
1da177e4 | 968 | if (!access_ok(VERIFY_READ, vtconsize, |
9cc3c22b AC |
969 | sizeof(struct vt_consize))) { |
970 | ret = -EFAULT; | |
971 | break; | |
972 | } | |
973 | /* FIXME: Should check the copies properly */ | |
1da177e4 LT |
974 | __get_user(ll, &vtconsize->v_rows); |
975 | __get_user(cc, &vtconsize->v_cols); | |
976 | __get_user(vlin, &vtconsize->v_vlin); | |
977 | __get_user(clin, &vtconsize->v_clin); | |
978 | __get_user(vcol, &vtconsize->v_vcol); | |
979 | __get_user(ccol, &vtconsize->v_ccol); | |
980 | vlin = vlin ? vlin : vc->vc_scan_lines; | |
981 | if (clin) { | |
982 | if (ll) { | |
9cc3c22b AC |
983 | if (ll != vlin/clin) { |
984 | /* Parameters don't add up */ | |
985 | ret = -EINVAL; | |
986 | break; | |
987 | } | |
1da177e4 LT |
988 | } else |
989 | ll = vlin/clin; | |
990 | } | |
991 | if (vcol && ccol) { | |
992 | if (cc) { | |
9cc3c22b AC |
993 | if (cc != vcol/ccol) { |
994 | ret = -EINVAL; | |
995 | break; | |
996 | } | |
1da177e4 LT |
997 | } else |
998 | cc = vcol/ccol; | |
999 | } | |
1000 | ||
9cc3c22b AC |
1001 | if (clin > 32) { |
1002 | ret = -EINVAL; | |
1003 | break; | |
1004 | } | |
1da177e4 LT |
1005 | |
1006 | for (i = 0; i < MAX_NR_CONSOLES; i++) { | |
1007 | if (!vc_cons[i].d) | |
1008 | continue; | |
1009 | acquire_console_sem(); | |
1010 | if (vlin) | |
1011 | vc_cons[i].d->vc_scan_lines = vlin; | |
1012 | if (clin) | |
1013 | vc_cons[i].d->vc_font.height = clin; | |
e400b6ec | 1014 | vc_cons[i].d->vc_resize_user = 1; |
1da177e4 LT |
1015 | vc_resize(vc_cons[i].d, cc, ll); |
1016 | release_console_sem(); | |
1017 | } | |
9cc3c22b | 1018 | break; |
1da177e4 LT |
1019 | } |
1020 | ||
1021 | case PIO_FONT: { | |
1022 | if (!perm) | |
9cc3c22b | 1023 | goto eperm; |
1da177e4 LT |
1024 | op.op = KD_FONT_OP_SET; |
1025 | op.flags = KD_FONT_FLAG_OLD | KD_FONT_FLAG_DONT_RECALC; /* Compatibility */ | |
1026 | op.width = 8; | |
1027 | op.height = 0; | |
1028 | op.charcount = 256; | |
1029 | op.data = up; | |
9cc3c22b AC |
1030 | ret = con_font_op(vc_cons[fg_console].d, &op); |
1031 | break; | |
1da177e4 LT |
1032 | } |
1033 | ||
1034 | case GIO_FONT: { | |
1035 | op.op = KD_FONT_OP_GET; | |
1036 | op.flags = KD_FONT_FLAG_OLD; | |
1037 | op.width = 8; | |
1038 | op.height = 32; | |
1039 | op.charcount = 256; | |
1040 | op.data = up; | |
9cc3c22b AC |
1041 | ret = con_font_op(vc_cons[fg_console].d, &op); |
1042 | break; | |
1da177e4 LT |
1043 | } |
1044 | ||
1045 | case PIO_CMAP: | |
1046 | if (!perm) | |
9cc3c22b AC |
1047 | ret = -EPERM; |
1048 | else | |
1049 | ret = con_set_cmap(up); | |
1050 | break; | |
1da177e4 LT |
1051 | |
1052 | case GIO_CMAP: | |
9cc3c22b AC |
1053 | ret = con_get_cmap(up); |
1054 | break; | |
1da177e4 LT |
1055 | |
1056 | case PIO_FONTX: | |
1057 | case GIO_FONTX: | |
9cc3c22b AC |
1058 | ret = do_fontx_ioctl(cmd, up, perm, &op); |
1059 | break; | |
1da177e4 LT |
1060 | |
1061 | case PIO_FONTRESET: | |
1062 | { | |
1063 | if (!perm) | |
9cc3c22b | 1064 | goto eperm; |
1da177e4 LT |
1065 | |
1066 | #ifdef BROKEN_GRAPHICS_PROGRAMS | |
1067 | /* With BROKEN_GRAPHICS_PROGRAMS defined, the default | |
1068 | font is not saved. */ | |
9cc3c22b AC |
1069 | ret = -ENOSYS; |
1070 | break; | |
1da177e4 LT |
1071 | #else |
1072 | { | |
1073 | op.op = KD_FONT_OP_SET_DEFAULT; | |
1074 | op.data = NULL; | |
9cc3c22b AC |
1075 | ret = con_font_op(vc_cons[fg_console].d, &op); |
1076 | if (ret) | |
1077 | break; | |
1da177e4 | 1078 | con_set_default_unimap(vc_cons[fg_console].d); |
9cc3c22b | 1079 | break; |
1da177e4 LT |
1080 | } |
1081 | #endif | |
1082 | } | |
1083 | ||
1084 | case KDFONTOP: { | |
9cc3c22b AC |
1085 | if (copy_from_user(&op, up, sizeof(op))) { |
1086 | ret = -EFAULT; | |
1087 | break; | |
1088 | } | |
1da177e4 | 1089 | if (!perm && op.op != KD_FONT_OP_GET) |
9cc3c22b AC |
1090 | goto eperm; |
1091 | ret = con_font_op(vc, &op); | |
1092 | if (ret) | |
1093 | break; | |
1da177e4 | 1094 | if (copy_to_user(up, &op, sizeof(op))) |
9cc3c22b AC |
1095 | ret = -EFAULT; |
1096 | break; | |
1da177e4 LT |
1097 | } |
1098 | ||
1099 | case PIO_SCRNMAP: | |
1100 | if (!perm) | |
9cc3c22b AC |
1101 | ret = -EPERM; |
1102 | else | |
1103 | ret = con_set_trans_old(up); | |
1104 | break; | |
1da177e4 LT |
1105 | |
1106 | case GIO_SCRNMAP: | |
9cc3c22b AC |
1107 | ret = con_get_trans_old(up); |
1108 | break; | |
1da177e4 LT |
1109 | |
1110 | case PIO_UNISCRNMAP: | |
1111 | if (!perm) | |
9cc3c22b AC |
1112 | ret = -EPERM; |
1113 | else | |
1114 | ret = con_set_trans_new(up); | |
1115 | break; | |
1da177e4 LT |
1116 | |
1117 | case GIO_UNISCRNMAP: | |
9cc3c22b AC |
1118 | ret = con_get_trans_new(up); |
1119 | break; | |
1da177e4 LT |
1120 | |
1121 | case PIO_UNIMAPCLR: | |
1122 | { struct unimapinit ui; | |
1123 | if (!perm) | |
9cc3c22b AC |
1124 | goto eperm; |
1125 | ret = copy_from_user(&ui, up, sizeof(struct unimapinit)); | |
1126 | if (!ret) | |
1127 | con_clear_unimap(vc, &ui); | |
1128 | break; | |
1da177e4 LT |
1129 | } |
1130 | ||
1131 | case PIO_UNIMAP: | |
1132 | case GIO_UNIMAP: | |
9cc3c22b AC |
1133 | ret = do_unimap_ioctl(cmd, up, perm, vc); |
1134 | break; | |
1da177e4 LT |
1135 | |
1136 | case VT_LOCKSWITCH: | |
1137 | if (!capable(CAP_SYS_TTY_CONFIG)) | |
9cc3c22b | 1138 | goto eperm; |
1da177e4 | 1139 | vt_dont_switch = 1; |
9cc3c22b | 1140 | break; |
1da177e4 LT |
1141 | case VT_UNLOCKSWITCH: |
1142 | if (!capable(CAP_SYS_TTY_CONFIG)) | |
9cc3c22b | 1143 | goto eperm; |
1da177e4 | 1144 | vt_dont_switch = 0; |
9cc3c22b | 1145 | break; |
533475d3 | 1146 | case VT_GETHIFONTMASK: |
9cc3c22b AC |
1147 | ret = put_user(vc->vc_hi_font_mask, |
1148 | (unsigned short __user *)arg); | |
1149 | break; | |
1da177e4 | 1150 | default: |
9cc3c22b | 1151 | ret = -ENOIOCTLCMD; |
1da177e4 | 1152 | } |
9cc3c22b AC |
1153 | out: |
1154 | unlock_kernel(); | |
1155 | return ret; | |
1156 | eperm: | |
1157 | ret = -EPERM; | |
1158 | goto out; | |
1da177e4 LT |
1159 | } |
1160 | ||
1161 | /* | |
1162 | * Sometimes we want to wait until a particular VT has been activated. We | |
1163 | * do it in a very simple manner. Everybody waits on a single queue and | |
1164 | * get woken up at once. Those that are satisfied go on with their business, | |
1165 | * while those not ready go back to sleep. Seems overkill to add a wait | |
1166 | * to each vt just for this - usually this does nothing! | |
1167 | */ | |
1168 | static DECLARE_WAIT_QUEUE_HEAD(vt_activate_queue); | |
1169 | ||
1170 | /* | |
1171 | * Sleeps until a vt is activated, or the task is interrupted. Returns | |
70cb9793 | 1172 | * 0 if activation, -EINTR if interrupted by a signal handler. |
1da177e4 LT |
1173 | */ |
1174 | int vt_waitactive(int vt) | |
1175 | { | |
1176 | int retval; | |
1177 | DECLARE_WAITQUEUE(wait, current); | |
1178 | ||
1179 | add_wait_queue(&vt_activate_queue, &wait); | |
1180 | for (;;) { | |
1da177e4 | 1181 | retval = 0; |
f991519c MJ |
1182 | |
1183 | /* | |
1184 | * Synchronize with redraw_screen(). By acquiring the console | |
1185 | * semaphore we make sure that the console switch is completed | |
1186 | * before we return. If we didn't wait for the semaphore, we | |
1187 | * could return at a point where fg_console has already been | |
1188 | * updated, but the console switch hasn't been completed. | |
1189 | */ | |
1190 | acquire_console_sem(); | |
1191 | set_current_state(TASK_INTERRUPTIBLE); | |
1192 | if (vt == fg_console) { | |
1193 | release_console_sem(); | |
1da177e4 | 1194 | break; |
f991519c MJ |
1195 | } |
1196 | release_console_sem(); | |
70cb9793 | 1197 | retval = -ERESTARTNOHAND; |
1da177e4 LT |
1198 | if (signal_pending(current)) |
1199 | break; | |
1200 | schedule(); | |
1201 | } | |
1202 | remove_wait_queue(&vt_activate_queue, &wait); | |
cc0a8fbb | 1203 | __set_current_state(TASK_RUNNING); |
1da177e4 LT |
1204 | return retval; |
1205 | } | |
1206 | ||
1207 | #define vt_wake_waitactive() wake_up(&vt_activate_queue) | |
1208 | ||
1209 | void reset_vc(struct vc_data *vc) | |
1210 | { | |
1211 | vc->vc_mode = KD_TEXT; | |
2e8ecb9d | 1212 | kbd_table[vc->vc_num].kbdmode = default_utf8 ? VC_UNICODE : VC_XLATE; |
1da177e4 LT |
1213 | vc->vt_mode.mode = VT_AUTO; |
1214 | vc->vt_mode.waitv = 0; | |
1215 | vc->vt_mode.relsig = 0; | |
1216 | vc->vt_mode.acqsig = 0; | |
1217 | vc->vt_mode.frsig = 0; | |
8b6312f4 EB |
1218 | put_pid(vc->vt_pid); |
1219 | vc->vt_pid = NULL; | |
1da177e4 LT |
1220 | vc->vt_newvt = -1; |
1221 | if (!in_interrupt()) /* Via keyboard.c:SAK() - akpm */ | |
1222 | reset_palette(vc); | |
1223 | } | |
1224 | ||
8b6312f4 EB |
1225 | void vc_SAK(struct work_struct *work) |
1226 | { | |
1227 | struct vc *vc_con = | |
1228 | container_of(work, struct vc, SAK_work); | |
1229 | struct vc_data *vc; | |
1230 | struct tty_struct *tty; | |
1231 | ||
1232 | acquire_console_sem(); | |
1233 | vc = vc_con->d; | |
1234 | if (vc) { | |
1235 | tty = vc->vc_tty; | |
1236 | /* | |
1237 | * SAK should also work in all raw modes and reset | |
1238 | * them properly. | |
1239 | */ | |
1240 | if (tty) | |
1241 | __do_SAK(tty); | |
1242 | reset_vc(vc); | |
1243 | } | |
1244 | release_console_sem(); | |
1245 | } | |
1246 | ||
1da177e4 LT |
1247 | /* |
1248 | * Performs the back end of a vt switch | |
1249 | */ | |
1250 | static void complete_change_console(struct vc_data *vc) | |
1251 | { | |
1252 | unsigned char old_vc_mode; | |
1253 | ||
1254 | last_console = fg_console; | |
1255 | ||
1256 | /* | |
1257 | * If we're switching, we could be going from KD_GRAPHICS to | |
1258 | * KD_TEXT mode or vice versa, which means we need to blank or | |
1259 | * unblank the screen later. | |
1260 | */ | |
1261 | old_vc_mode = vc_cons[fg_console].d->vc_mode; | |
1262 | switch_screen(vc); | |
1263 | ||
1264 | /* | |
3dfcaf16 | 1265 | * This can't appear below a successful kill_pid(). If it did, |
1da177e4 LT |
1266 | * then the *blank_screen operation could occur while X, having |
1267 | * received acqsig, is waking up on another processor. This | |
1268 | * condition can lead to overlapping accesses to the VGA range | |
1269 | * and the framebuffer (causing system lockups). | |
1270 | * | |
1271 | * To account for this we duplicate this code below only if the | |
1272 | * controlling process is gone and we've called reset_vc. | |
1273 | */ | |
1274 | if (old_vc_mode != vc->vc_mode) { | |
1275 | if (vc->vc_mode == KD_TEXT) | |
1276 | do_unblank_screen(1); | |
1277 | else | |
1278 | do_blank_screen(1); | |
1279 | } | |
1280 | ||
1281 | /* | |
1282 | * If this new console is under process control, send it a signal | |
1283 | * telling it that it has acquired. Also check if it has died and | |
1284 | * clean up (similar to logic employed in change_console()) | |
1285 | */ | |
1286 | if (vc->vt_mode.mode == VT_PROCESS) { | |
1287 | /* | |
3dfcaf16 | 1288 | * Send the signal as privileged - kill_pid() will |
1da177e4 LT |
1289 | * tell us if the process has gone or something else |
1290 | * is awry | |
1291 | */ | |
bde0d2c9 | 1292 | if (kill_pid(vc->vt_pid, vc->vt_mode.acqsig, 1) != 0) { |
1da177e4 LT |
1293 | /* |
1294 | * The controlling process has died, so we revert back to | |
1295 | * normal operation. In this case, we'll also change back | |
1296 | * to KD_TEXT mode. I'm not sure if this is strictly correct | |
1297 | * but it saves the agony when the X server dies and the screen | |
1298 | * remains blanked due to KD_GRAPHICS! It would be nice to do | |
1299 | * this outside of VT_PROCESS but there is no single process | |
1300 | * to account for and tracking tty count may be undesirable. | |
1301 | */ | |
1302 | reset_vc(vc); | |
1303 | ||
1304 | if (old_vc_mode != vc->vc_mode) { | |
1305 | if (vc->vc_mode == KD_TEXT) | |
1306 | do_unblank_screen(1); | |
1307 | else | |
1308 | do_blank_screen(1); | |
1309 | } | |
1310 | } | |
1311 | } | |
1312 | ||
1313 | /* | |
1314 | * Wake anyone waiting for their VT to activate | |
1315 | */ | |
1316 | vt_wake_waitactive(); | |
1317 | return; | |
1318 | } | |
1319 | ||
1320 | /* | |
1321 | * Performs the front-end of a vt switch | |
1322 | */ | |
1323 | void change_console(struct vc_data *new_vc) | |
1324 | { | |
1325 | struct vc_data *vc; | |
1326 | ||
1327 | if (!new_vc || new_vc->vc_num == fg_console || vt_dont_switch) | |
1328 | return; | |
1329 | ||
1330 | /* | |
1331 | * If this vt is in process mode, then we need to handshake with | |
1332 | * that process before switching. Essentially, we store where that | |
1333 | * vt wants to switch to and wait for it to tell us when it's done | |
1334 | * (via VT_RELDISP ioctl). | |
1335 | * | |
1336 | * We also check to see if the controlling process still exists. | |
1337 | * If it doesn't, we reset this vt to auto mode and continue. | |
1338 | * This is a cheap way to track process control. The worst thing | |
1339 | * that can happen is: we send a signal to a process, it dies, and | |
1340 | * the switch gets "lost" waiting for a response; hopefully, the | |
1341 | * user will try again, we'll detect the process is gone (unless | |
1342 | * the user waits just the right amount of time :-) and revert the | |
1343 | * vt to auto control. | |
1344 | */ | |
1345 | vc = vc_cons[fg_console].d; | |
1346 | if (vc->vt_mode.mode == VT_PROCESS) { | |
1347 | /* | |
3dfcaf16 | 1348 | * Send the signal as privileged - kill_pid() will |
1da177e4 | 1349 | * tell us if the process has gone or something else |
a64314e6 JL |
1350 | * is awry. |
1351 | * | |
1352 | * We need to set vt_newvt *before* sending the signal or we | |
1353 | * have a race. | |
1da177e4 | 1354 | */ |
a64314e6 | 1355 | vc->vt_newvt = new_vc->vc_num; |
bde0d2c9 | 1356 | if (kill_pid(vc->vt_pid, vc->vt_mode.relsig, 1) == 0) { |
1da177e4 LT |
1357 | /* |
1358 | * It worked. Mark the vt to switch to and | |
1359 | * return. The process needs to send us a | |
1360 | * VT_RELDISP ioctl to complete the switch. | |
1361 | */ | |
1da177e4 LT |
1362 | return; |
1363 | } | |
1364 | ||
1365 | /* | |
1366 | * The controlling process has died, so we revert back to | |
1367 | * normal operation. In this case, we'll also change back | |
1368 | * to KD_TEXT mode. I'm not sure if this is strictly correct | |
1369 | * but it saves the agony when the X server dies and the screen | |
1370 | * remains blanked due to KD_GRAPHICS! It would be nice to do | |
1371 | * this outside of VT_PROCESS but there is no single process | |
1372 | * to account for and tracking tty count may be undesirable. | |
1373 | */ | |
1374 | reset_vc(vc); | |
1375 | ||
1376 | /* | |
1377 | * Fall through to normal (VT_AUTO) handling of the switch... | |
1378 | */ | |
1379 | } | |
1380 | ||
1381 | /* | |
1382 | * Ignore all switches in KD_GRAPHICS+VT_AUTO mode | |
1383 | */ | |
1384 | if (vc->vc_mode == KD_GRAPHICS) | |
1385 | return; | |
1386 | ||
1387 | complete_change_console(new_vc); | |
1388 | } |