| 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 | |
| 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> |
| 26 | #include <linux/consolemap.h> |
| 27 | #include <linux/signal.h> |
| 28 | #include <linux/smp_lock.h> |
| 29 | #include <linux/timex.h> |
| 30 | |
| 31 | #include <asm/io.h> |
| 32 | #include <asm/uaccess.h> |
| 33 | |
| 34 | #include <linux/kbd_kern.h> |
| 35 | #include <linux/vt_kern.h> |
| 36 | #include <linux/kbd_diacr.h> |
| 37 | #include <linux/selection.h> |
| 38 | |
| 39 | char vt_dont_switch; |
| 40 | extern struct tty_driver *console_driver; |
| 41 | |
| 42 | #define VT_IS_IN_USE(i) (console_driver->ttys[i] && console_driver->ttys[i]->count) |
| 43 | #define VT_BUSY(i) (VT_IS_IN_USE(i) || i == fg_console || vc_cons[i].d == sel_cons) |
| 44 | |
| 45 | /* |
| 46 | * Console (vt and kd) routines, as defined by USL SVR4 manual, and by |
| 47 | * experimentation and study of X386 SYSV handling. |
| 48 | * |
| 49 | * One point of difference: SYSV vt's are /dev/vtX, which X >= 0, and |
| 50 | * /dev/console is a separate ttyp. Under Linux, /dev/tty0 is /dev/console, |
| 51 | * and the vc start at /dev/ttyX, X >= 1. We maintain that here, so we will |
| 52 | * always treat our set of vt as numbered 1..MAX_NR_CONSOLES (corresponding to |
| 53 | * ttys 0..MAX_NR_CONSOLES-1). Explicitly naming VT 0 is illegal, but using |
| 54 | * /dev/tty0 (fg_console) as a target is legal, since an implicit aliasing |
| 55 | * to the current console is done by the main ioctl code. |
| 56 | */ |
| 57 | |
| 58 | #ifdef CONFIG_X86 |
| 59 | #include <linux/syscalls.h> |
| 60 | #endif |
| 61 | |
| 62 | static void complete_change_console(struct vc_data *vc); |
| 63 | |
| 64 | /* |
| 65 | * these are the valid i/o ports we're allowed to change. they map all the |
| 66 | * video ports |
| 67 | */ |
| 68 | #define GPFIRST 0x3b4 |
| 69 | #define GPLAST 0x3df |
| 70 | #define GPNUM (GPLAST - GPFIRST + 1) |
| 71 | |
| 72 | #define i (tmp.kb_index) |
| 73 | #define s (tmp.kb_table) |
| 74 | #define v (tmp.kb_value) |
| 75 | static inline int |
| 76 | do_kdsk_ioctl(int cmd, struct kbentry __user *user_kbe, int perm, struct kbd_struct *kbd) |
| 77 | { |
| 78 | struct kbentry tmp; |
| 79 | ushort *key_map, val, ov; |
| 80 | |
| 81 | if (copy_from_user(&tmp, user_kbe, sizeof(struct kbentry))) |
| 82 | return -EFAULT; |
| 83 | |
| 84 | if (!capable(CAP_SYS_TTY_CONFIG)) |
| 85 | perm = 0; |
| 86 | |
| 87 | switch (cmd) { |
| 88 | case KDGKBENT: |
| 89 | key_map = key_maps[s]; |
| 90 | if (key_map) { |
| 91 | val = U(key_map[i]); |
| 92 | if (kbd->kbdmode != VC_UNICODE && KTYP(val) >= NR_TYPES) |
| 93 | val = K_HOLE; |
| 94 | } else |
| 95 | val = (i ? K_HOLE : K_NOSUCHMAP); |
| 96 | return put_user(val, &user_kbe->kb_value); |
| 97 | case KDSKBENT: |
| 98 | if (!perm) |
| 99 | return -EPERM; |
| 100 | if (!i && v == K_NOSUCHMAP) { |
| 101 | /* deallocate map */ |
| 102 | key_map = key_maps[s]; |
| 103 | if (s && key_map) { |
| 104 | key_maps[s] = NULL; |
| 105 | if (key_map[0] == U(K_ALLOCATED)) { |
| 106 | kfree(key_map); |
| 107 | keymap_count--; |
| 108 | } |
| 109 | } |
| 110 | break; |
| 111 | } |
| 112 | |
| 113 | if (KTYP(v) < NR_TYPES) { |
| 114 | if (KVAL(v) > max_vals[KTYP(v)]) |
| 115 | return -EINVAL; |
| 116 | } else |
| 117 | if (kbd->kbdmode != VC_UNICODE) |
| 118 | return -EINVAL; |
| 119 | |
| 120 | /* ++Geert: non-PC keyboards may generate keycode zero */ |
| 121 | #if !defined(__mc68000__) && !defined(__powerpc__) |
| 122 | /* assignment to entry 0 only tests validity of args */ |
| 123 | if (!i) |
| 124 | break; |
| 125 | #endif |
| 126 | |
| 127 | if (!(key_map = key_maps[s])) { |
| 128 | int j; |
| 129 | |
| 130 | if (keymap_count >= MAX_NR_OF_USER_KEYMAPS && |
| 131 | !capable(CAP_SYS_RESOURCE)) |
| 132 | return -EPERM; |
| 133 | |
| 134 | key_map = kmalloc(sizeof(plain_map), |
| 135 | GFP_KERNEL); |
| 136 | if (!key_map) |
| 137 | return -ENOMEM; |
| 138 | key_maps[s] = key_map; |
| 139 | key_map[0] = U(K_ALLOCATED); |
| 140 | for (j = 1; j < NR_KEYS; j++) |
| 141 | key_map[j] = U(K_HOLE); |
| 142 | keymap_count++; |
| 143 | } |
| 144 | ov = U(key_map[i]); |
| 145 | if (v == ov) |
| 146 | break; /* nothing to do */ |
| 147 | /* |
| 148 | * Attention Key. |
| 149 | */ |
| 150 | if (((ov == K_SAK) || (v == K_SAK)) && !capable(CAP_SYS_ADMIN)) |
| 151 | return -EPERM; |
| 152 | key_map[i] = U(v); |
| 153 | if (!s && (KTYP(ov) == KT_SHIFT || KTYP(v) == KT_SHIFT)) |
| 154 | compute_shiftstate(); |
| 155 | break; |
| 156 | } |
| 157 | return 0; |
| 158 | } |
| 159 | #undef i |
| 160 | #undef s |
| 161 | #undef v |
| 162 | |
| 163 | static inline int |
| 164 | do_kbkeycode_ioctl(int cmd, struct kbkeycode __user *user_kbkc, int perm) |
| 165 | { |
| 166 | struct kbkeycode tmp; |
| 167 | int kc = 0; |
| 168 | |
| 169 | if (copy_from_user(&tmp, user_kbkc, sizeof(struct kbkeycode))) |
| 170 | return -EFAULT; |
| 171 | switch (cmd) { |
| 172 | case KDGETKEYCODE: |
| 173 | kc = getkeycode(tmp.scancode); |
| 174 | if (kc >= 0) |
| 175 | kc = put_user(kc, &user_kbkc->keycode); |
| 176 | break; |
| 177 | case KDSETKEYCODE: |
| 178 | if (!perm) |
| 179 | return -EPERM; |
| 180 | kc = setkeycode(tmp.scancode, tmp.keycode); |
| 181 | break; |
| 182 | } |
| 183 | return kc; |
| 184 | } |
| 185 | |
| 186 | static inline int |
| 187 | do_kdgkb_ioctl(int cmd, struct kbsentry __user *user_kdgkb, int perm) |
| 188 | { |
| 189 | struct kbsentry *kbs; |
| 190 | char *p; |
| 191 | u_char *q; |
| 192 | u_char __user *up; |
| 193 | int sz; |
| 194 | int delta; |
| 195 | char *first_free, *fj, *fnw; |
| 196 | int i, j, k; |
| 197 | int ret; |
| 198 | |
| 199 | if (!capable(CAP_SYS_TTY_CONFIG)) |
| 200 | perm = 0; |
| 201 | |
| 202 | kbs = kmalloc(sizeof(*kbs), GFP_KERNEL); |
| 203 | if (!kbs) { |
| 204 | ret = -ENOMEM; |
| 205 | goto reterr; |
| 206 | } |
| 207 | |
| 208 | /* we mostly copy too much here (512bytes), but who cares ;) */ |
| 209 | if (copy_from_user(kbs, user_kdgkb, sizeof(struct kbsentry))) { |
| 210 | ret = -EFAULT; |
| 211 | goto reterr; |
| 212 | } |
| 213 | kbs->kb_string[sizeof(kbs->kb_string)-1] = '\0'; |
| 214 | i = kbs->kb_func; |
| 215 | |
| 216 | switch (cmd) { |
| 217 | case KDGKBSENT: |
| 218 | sz = sizeof(kbs->kb_string) - 1; /* sz should have been |
| 219 | a struct member */ |
| 220 | up = user_kdgkb->kb_string; |
| 221 | p = func_table[i]; |
| 222 | if(p) |
| 223 | for ( ; *p && sz; p++, sz--) |
| 224 | if (put_user(*p, up++)) { |
| 225 | ret = -EFAULT; |
| 226 | goto reterr; |
| 227 | } |
| 228 | if (put_user('\0', up)) { |
| 229 | ret = -EFAULT; |
| 230 | goto reterr; |
| 231 | } |
| 232 | kfree(kbs); |
| 233 | return ((p && *p) ? -EOVERFLOW : 0); |
| 234 | case KDSKBSENT: |
| 235 | if (!perm) { |
| 236 | ret = -EPERM; |
| 237 | goto reterr; |
| 238 | } |
| 239 | |
| 240 | q = func_table[i]; |
| 241 | first_free = funcbufptr + (funcbufsize - funcbufleft); |
| 242 | for (j = i+1; j < MAX_NR_FUNC && !func_table[j]; j++) |
| 243 | ; |
| 244 | if (j < MAX_NR_FUNC) |
| 245 | fj = func_table[j]; |
| 246 | else |
| 247 | fj = first_free; |
| 248 | |
| 249 | delta = (q ? -strlen(q) : 1) + strlen(kbs->kb_string); |
| 250 | if (delta <= funcbufleft) { /* it fits in current buf */ |
| 251 | if (j < MAX_NR_FUNC) { |
| 252 | memmove(fj + delta, fj, first_free - fj); |
| 253 | for (k = j; k < MAX_NR_FUNC; k++) |
| 254 | if (func_table[k]) |
| 255 | func_table[k] += delta; |
| 256 | } |
| 257 | if (!q) |
| 258 | func_table[i] = fj; |
| 259 | funcbufleft -= delta; |
| 260 | } else { /* allocate a larger buffer */ |
| 261 | sz = 256; |
| 262 | while (sz < funcbufsize - funcbufleft + delta) |
| 263 | sz <<= 1; |
| 264 | fnw = kmalloc(sz, GFP_KERNEL); |
| 265 | if(!fnw) { |
| 266 | ret = -ENOMEM; |
| 267 | goto reterr; |
| 268 | } |
| 269 | |
| 270 | if (!q) |
| 271 | func_table[i] = fj; |
| 272 | if (fj > funcbufptr) |
| 273 | memmove(fnw, funcbufptr, fj - funcbufptr); |
| 274 | for (k = 0; k < j; k++) |
| 275 | if (func_table[k]) |
| 276 | func_table[k] = fnw + (func_table[k] - funcbufptr); |
| 277 | |
| 278 | if (first_free > fj) { |
| 279 | memmove(fnw + (fj - funcbufptr) + delta, fj, first_free - fj); |
| 280 | for (k = j; k < MAX_NR_FUNC; k++) |
| 281 | if (func_table[k]) |
| 282 | func_table[k] = fnw + (func_table[k] - funcbufptr) + delta; |
| 283 | } |
| 284 | if (funcbufptr != func_buf) |
| 285 | kfree(funcbufptr); |
| 286 | funcbufptr = fnw; |
| 287 | funcbufleft = funcbufleft - delta + sz - funcbufsize; |
| 288 | funcbufsize = sz; |
| 289 | } |
| 290 | strcpy(func_table[i], kbs->kb_string); |
| 291 | break; |
| 292 | } |
| 293 | ret = 0; |
| 294 | reterr: |
| 295 | kfree(kbs); |
| 296 | return ret; |
| 297 | } |
| 298 | |
| 299 | static inline int |
| 300 | do_fontx_ioctl(int cmd, struct consolefontdesc __user *user_cfd, int perm, struct console_font_op *op) |
| 301 | { |
| 302 | struct consolefontdesc cfdarg; |
| 303 | int i; |
| 304 | |
| 305 | if (copy_from_user(&cfdarg, user_cfd, sizeof(struct consolefontdesc))) |
| 306 | return -EFAULT; |
| 307 | |
| 308 | switch (cmd) { |
| 309 | case PIO_FONTX: |
| 310 | if (!perm) |
| 311 | return -EPERM; |
| 312 | op->op = KD_FONT_OP_SET; |
| 313 | op->flags = KD_FONT_FLAG_OLD; |
| 314 | op->width = 8; |
| 315 | op->height = cfdarg.charheight; |
| 316 | op->charcount = cfdarg.charcount; |
| 317 | op->data = cfdarg.chardata; |
| 318 | return con_font_op(vc_cons[fg_console].d, op); |
| 319 | case GIO_FONTX: { |
| 320 | op->op = KD_FONT_OP_GET; |
| 321 | op->flags = KD_FONT_FLAG_OLD; |
| 322 | op->width = 8; |
| 323 | op->height = cfdarg.charheight; |
| 324 | op->charcount = cfdarg.charcount; |
| 325 | op->data = cfdarg.chardata; |
| 326 | i = con_font_op(vc_cons[fg_console].d, op); |
| 327 | if (i) |
| 328 | return i; |
| 329 | cfdarg.charheight = op->height; |
| 330 | cfdarg.charcount = op->charcount; |
| 331 | if (copy_to_user(user_cfd, &cfdarg, sizeof(struct consolefontdesc))) |
| 332 | return -EFAULT; |
| 333 | return 0; |
| 334 | } |
| 335 | } |
| 336 | return -EINVAL; |
| 337 | } |
| 338 | |
| 339 | static inline int |
| 340 | do_unimap_ioctl(int cmd, struct unimapdesc __user *user_ud, int perm, struct vc_data *vc) |
| 341 | { |
| 342 | struct unimapdesc tmp; |
| 343 | |
| 344 | if (copy_from_user(&tmp, user_ud, sizeof tmp)) |
| 345 | return -EFAULT; |
| 346 | if (tmp.entries) |
| 347 | if (!access_ok(VERIFY_WRITE, tmp.entries, |
| 348 | tmp.entry_ct*sizeof(struct unipair))) |
| 349 | return -EFAULT; |
| 350 | switch (cmd) { |
| 351 | case PIO_UNIMAP: |
| 352 | if (!perm) |
| 353 | return -EPERM; |
| 354 | return con_set_unimap(vc, tmp.entry_ct, tmp.entries); |
| 355 | case GIO_UNIMAP: |
| 356 | if (!perm && fg_console != vc->vc_num) |
| 357 | return -EPERM; |
| 358 | return con_get_unimap(vc, tmp.entry_ct, &(user_ud->entry_ct), tmp.entries); |
| 359 | } |
| 360 | return 0; |
| 361 | } |
| 362 | |
| 363 | /* |
| 364 | * We handle the console-specific ioctl's here. We allow the |
| 365 | * capability to modify any console, not just the fg_console. |
| 366 | */ |
| 367 | int vt_ioctl(struct tty_struct *tty, struct file * file, |
| 368 | unsigned int cmd, unsigned long arg) |
| 369 | { |
| 370 | struct vc_data *vc = tty->driver_data; |
| 371 | struct console_font_op op; /* used in multiple places here */ |
| 372 | struct kbd_struct * kbd; |
| 373 | unsigned int console; |
| 374 | unsigned char ucval; |
| 375 | void __user *up = (void __user *)arg; |
| 376 | int i, perm; |
| 377 | int ret = 0; |
| 378 | |
| 379 | console = vc->vc_num; |
| 380 | |
| 381 | lock_kernel(); |
| 382 | |
| 383 | if (!vc_cons_allocated(console)) { /* impossible? */ |
| 384 | ret = -ENOIOCTLCMD; |
| 385 | goto out; |
| 386 | } |
| 387 | |
| 388 | |
| 389 | /* |
| 390 | * To have permissions to do most of the vt ioctls, we either have |
| 391 | * to be the owner of the tty, or have CAP_SYS_TTY_CONFIG. |
| 392 | */ |
| 393 | perm = 0; |
| 394 | if (current->signal->tty == tty || capable(CAP_SYS_TTY_CONFIG)) |
| 395 | perm = 1; |
| 396 | |
| 397 | kbd = kbd_table + console; |
| 398 | switch (cmd) { |
| 399 | case TIOCLINUX: |
| 400 | ret = tioclinux(tty, arg); |
| 401 | break; |
| 402 | case KIOCSOUND: |
| 403 | if (!perm) |
| 404 | goto eperm; |
| 405 | /* FIXME: This is an old broken API but we need to keep it |
| 406 | supported and somehow separate the historic advertised |
| 407 | tick rate from any real one */ |
| 408 | if (arg) |
| 409 | arg = CLOCK_TICK_RATE / arg; |
| 410 | kd_mksound(arg, 0); |
| 411 | break; |
| 412 | |
| 413 | case KDMKTONE: |
| 414 | if (!perm) |
| 415 | goto eperm; |
| 416 | { |
| 417 | unsigned int ticks, count; |
| 418 | |
| 419 | /* |
| 420 | * Generate the tone for the appropriate number of ticks. |
| 421 | * If the time is zero, turn off sound ourselves. |
| 422 | */ |
| 423 | ticks = HZ * ((arg >> 16) & 0xffff) / 1000; |
| 424 | count = ticks ? (arg & 0xffff) : 0; |
| 425 | /* FIXME: This is an old broken API but we need to keep it |
| 426 | supported and somehow separate the historic advertised |
| 427 | tick rate from any real one */ |
| 428 | if (count) |
| 429 | count = CLOCK_TICK_RATE / count; |
| 430 | kd_mksound(count, ticks); |
| 431 | break; |
| 432 | } |
| 433 | |
| 434 | case KDGKBTYPE: |
| 435 | /* |
| 436 | * this is naive. |
| 437 | */ |
| 438 | ucval = KB_101; |
| 439 | goto setchar; |
| 440 | |
| 441 | /* |
| 442 | * These cannot be implemented on any machine that implements |
| 443 | * ioperm() in user level (such as Alpha PCs) or not at all. |
| 444 | * |
| 445 | * XXX: you should never use these, just call ioperm directly.. |
| 446 | */ |
| 447 | #ifdef CONFIG_X86 |
| 448 | case KDADDIO: |
| 449 | case KDDELIO: |
| 450 | /* |
| 451 | * KDADDIO and KDDELIO may be able to add ports beyond what |
| 452 | * we reject here, but to be safe... |
| 453 | */ |
| 454 | if (arg < GPFIRST || arg > GPLAST) { |
| 455 | ret = -EINVAL; |
| 456 | break; |
| 457 | } |
| 458 | ret = sys_ioperm(arg, 1, (cmd == KDADDIO)) ? -ENXIO : 0; |
| 459 | break; |
| 460 | |
| 461 | case KDENABIO: |
| 462 | case KDDISABIO: |
| 463 | ret = sys_ioperm(GPFIRST, GPNUM, |
| 464 | (cmd == KDENABIO)) ? -ENXIO : 0; |
| 465 | break; |
| 466 | #endif |
| 467 | |
| 468 | /* Linux m68k/i386 interface for setting the keyboard delay/repeat rate */ |
| 469 | |
| 470 | case KDKBDREP: |
| 471 | { |
| 472 | struct kbd_repeat kbrep; |
| 473 | |
| 474 | if (!capable(CAP_SYS_TTY_CONFIG)) |
| 475 | goto eperm; |
| 476 | |
| 477 | if (copy_from_user(&kbrep, up, sizeof(struct kbd_repeat))) { |
| 478 | ret = -EFAULT; |
| 479 | break; |
| 480 | } |
| 481 | ret = kbd_rate(&kbrep); |
| 482 | if (ret) |
| 483 | break; |
| 484 | if (copy_to_user(up, &kbrep, sizeof(struct kbd_repeat))) |
| 485 | ret = -EFAULT; |
| 486 | break; |
| 487 | } |
| 488 | |
| 489 | case KDSETMODE: |
| 490 | /* |
| 491 | * currently, setting the mode from KD_TEXT to KD_GRAPHICS |
| 492 | * doesn't do a whole lot. i'm not sure if it should do any |
| 493 | * restoration of modes or what... |
| 494 | * |
| 495 | * XXX It should at least call into the driver, fbdev's definitely |
| 496 | * need to restore their engine state. --BenH |
| 497 | */ |
| 498 | if (!perm) |
| 499 | goto eperm; |
| 500 | switch (arg) { |
| 501 | case KD_GRAPHICS: |
| 502 | break; |
| 503 | case KD_TEXT0: |
| 504 | case KD_TEXT1: |
| 505 | arg = KD_TEXT; |
| 506 | case KD_TEXT: |
| 507 | break; |
| 508 | default: |
| 509 | ret = -EINVAL; |
| 510 | goto out; |
| 511 | } |
| 512 | if (vc->vc_mode == (unsigned char) arg) |
| 513 | break; |
| 514 | vc->vc_mode = (unsigned char) arg; |
| 515 | if (console != fg_console) |
| 516 | break; |
| 517 | /* |
| 518 | * explicitly blank/unblank the screen if switching modes |
| 519 | */ |
| 520 | acquire_console_sem(); |
| 521 | if (arg == KD_TEXT) |
| 522 | do_unblank_screen(1); |
| 523 | else |
| 524 | do_blank_screen(1); |
| 525 | release_console_sem(); |
| 526 | break; |
| 527 | |
| 528 | case KDGETMODE: |
| 529 | ucval = vc->vc_mode; |
| 530 | goto setint; |
| 531 | |
| 532 | case KDMAPDISP: |
| 533 | case KDUNMAPDISP: |
| 534 | /* |
| 535 | * these work like a combination of mmap and KDENABIO. |
| 536 | * this could be easily finished. |
| 537 | */ |
| 538 | ret = -EINVAL; |
| 539 | break; |
| 540 | |
| 541 | case KDSKBMODE: |
| 542 | if (!perm) |
| 543 | goto eperm; |
| 544 | switch(arg) { |
| 545 | case K_RAW: |
| 546 | kbd->kbdmode = VC_RAW; |
| 547 | break; |
| 548 | case K_MEDIUMRAW: |
| 549 | kbd->kbdmode = VC_MEDIUMRAW; |
| 550 | break; |
| 551 | case K_XLATE: |
| 552 | kbd->kbdmode = VC_XLATE; |
| 553 | compute_shiftstate(); |
| 554 | break; |
| 555 | case K_UNICODE: |
| 556 | kbd->kbdmode = VC_UNICODE; |
| 557 | compute_shiftstate(); |
| 558 | break; |
| 559 | default: |
| 560 | ret = -EINVAL; |
| 561 | goto out; |
| 562 | } |
| 563 | tty_ldisc_flush(tty); |
| 564 | break; |
| 565 | |
| 566 | case KDGKBMODE: |
| 567 | ucval = ((kbd->kbdmode == VC_RAW) ? K_RAW : |
| 568 | (kbd->kbdmode == VC_MEDIUMRAW) ? K_MEDIUMRAW : |
| 569 | (kbd->kbdmode == VC_UNICODE) ? K_UNICODE : |
| 570 | K_XLATE); |
| 571 | goto setint; |
| 572 | |
| 573 | /* this could be folded into KDSKBMODE, but for compatibility |
| 574 | reasons it is not so easy to fold KDGKBMETA into KDGKBMODE */ |
| 575 | case KDSKBMETA: |
| 576 | switch(arg) { |
| 577 | case K_METABIT: |
| 578 | clr_vc_kbd_mode(kbd, VC_META); |
| 579 | break; |
| 580 | case K_ESCPREFIX: |
| 581 | set_vc_kbd_mode(kbd, VC_META); |
| 582 | break; |
| 583 | default: |
| 584 | ret = -EINVAL; |
| 585 | } |
| 586 | break; |
| 587 | |
| 588 | case KDGKBMETA: |
| 589 | ucval = (vc_kbd_mode(kbd, VC_META) ? K_ESCPREFIX : K_METABIT); |
| 590 | setint: |
| 591 | ret = put_user(ucval, (int __user *)arg); |
| 592 | break; |
| 593 | |
| 594 | case KDGETKEYCODE: |
| 595 | case KDSETKEYCODE: |
| 596 | if(!capable(CAP_SYS_TTY_CONFIG)) |
| 597 | perm = 0; |
| 598 | ret = do_kbkeycode_ioctl(cmd, up, perm); |
| 599 | break; |
| 600 | |
| 601 | case KDGKBENT: |
| 602 | case KDSKBENT: |
| 603 | ret = do_kdsk_ioctl(cmd, up, perm, kbd); |
| 604 | break; |
| 605 | |
| 606 | case KDGKBSENT: |
| 607 | case KDSKBSENT: |
| 608 | ret = do_kdgkb_ioctl(cmd, up, perm); |
| 609 | break; |
| 610 | |
| 611 | case KDGKBDIACR: |
| 612 | { |
| 613 | struct kbdiacrs __user *a = up; |
| 614 | struct kbdiacr diacr; |
| 615 | int i; |
| 616 | |
| 617 | if (put_user(accent_table_size, &a->kb_cnt)) { |
| 618 | ret = -EFAULT; |
| 619 | break; |
| 620 | } |
| 621 | for (i = 0; i < accent_table_size; i++) { |
| 622 | diacr.diacr = conv_uni_to_8bit(accent_table[i].diacr); |
| 623 | diacr.base = conv_uni_to_8bit(accent_table[i].base); |
| 624 | diacr.result = conv_uni_to_8bit(accent_table[i].result); |
| 625 | if (copy_to_user(a->kbdiacr + i, &diacr, sizeof(struct kbdiacr))) { |
| 626 | ret = -EFAULT; |
| 627 | break; |
| 628 | } |
| 629 | } |
| 630 | break; |
| 631 | } |
| 632 | case KDGKBDIACRUC: |
| 633 | { |
| 634 | struct kbdiacrsuc __user *a = up; |
| 635 | |
| 636 | if (put_user(accent_table_size, &a->kb_cnt)) |
| 637 | ret = -EFAULT; |
| 638 | else if (copy_to_user(a->kbdiacruc, accent_table, |
| 639 | accent_table_size*sizeof(struct kbdiacruc))) |
| 640 | ret = -EFAULT; |
| 641 | break; |
| 642 | } |
| 643 | |
| 644 | case KDSKBDIACR: |
| 645 | { |
| 646 | struct kbdiacrs __user *a = up; |
| 647 | struct kbdiacr diacr; |
| 648 | unsigned int ct; |
| 649 | int i; |
| 650 | |
| 651 | if (!perm) |
| 652 | goto eperm; |
| 653 | if (get_user(ct,&a->kb_cnt)) { |
| 654 | ret = -EFAULT; |
| 655 | break; |
| 656 | } |
| 657 | if (ct >= MAX_DIACR) { |
| 658 | ret = -EINVAL; |
| 659 | break; |
| 660 | } |
| 661 | accent_table_size = ct; |
| 662 | for (i = 0; i < ct; i++) { |
| 663 | if (copy_from_user(&diacr, a->kbdiacr + i, sizeof(struct kbdiacr))) { |
| 664 | ret = -EFAULT; |
| 665 | break; |
| 666 | } |
| 667 | accent_table[i].diacr = conv_8bit_to_uni(diacr.diacr); |
| 668 | accent_table[i].base = conv_8bit_to_uni(diacr.base); |
| 669 | accent_table[i].result = conv_8bit_to_uni(diacr.result); |
| 670 | } |
| 671 | break; |
| 672 | } |
| 673 | |
| 674 | case KDSKBDIACRUC: |
| 675 | { |
| 676 | struct kbdiacrsuc __user *a = up; |
| 677 | unsigned int ct; |
| 678 | |
| 679 | if (!perm) |
| 680 | goto eperm; |
| 681 | if (get_user(ct,&a->kb_cnt)) { |
| 682 | ret = -EFAULT; |
| 683 | break; |
| 684 | } |
| 685 | if (ct >= MAX_DIACR) { |
| 686 | ret = -EINVAL; |
| 687 | break; |
| 688 | } |
| 689 | accent_table_size = ct; |
| 690 | if (copy_from_user(accent_table, a->kbdiacruc, ct*sizeof(struct kbdiacruc))) |
| 691 | ret = -EFAULT; |
| 692 | break; |
| 693 | } |
| 694 | |
| 695 | /* the ioctls below read/set the flags usually shown in the leds */ |
| 696 | /* don't use them - they will go away without warning */ |
| 697 | case KDGKBLED: |
| 698 | ucval = kbd->ledflagstate | (kbd->default_ledflagstate << 4); |
| 699 | goto setchar; |
| 700 | |
| 701 | case KDSKBLED: |
| 702 | if (!perm) |
| 703 | goto eperm; |
| 704 | if (arg & ~0x77) { |
| 705 | ret = -EINVAL; |
| 706 | break; |
| 707 | } |
| 708 | kbd->ledflagstate = (arg & 7); |
| 709 | kbd->default_ledflagstate = ((arg >> 4) & 7); |
| 710 | set_leds(); |
| 711 | break; |
| 712 | |
| 713 | /* the ioctls below only set the lights, not the functions */ |
| 714 | /* for those, see KDGKBLED and KDSKBLED above */ |
| 715 | case KDGETLED: |
| 716 | ucval = getledstate(); |
| 717 | setchar: |
| 718 | ret = put_user(ucval, (char __user *)arg); |
| 719 | break; |
| 720 | |
| 721 | case KDSETLED: |
| 722 | if (!perm) |
| 723 | goto eperm; |
| 724 | setledstate(kbd, arg); |
| 725 | break; |
| 726 | |
| 727 | /* |
| 728 | * A process can indicate its willingness to accept signals |
| 729 | * generated by pressing an appropriate key combination. |
| 730 | * Thus, one can have a daemon that e.g. spawns a new console |
| 731 | * upon a keypress and then changes to it. |
| 732 | * See also the kbrequest field of inittab(5). |
| 733 | */ |
| 734 | case KDSIGACCEPT: |
| 735 | { |
| 736 | if (!perm || !capable(CAP_KILL)) |
| 737 | goto eperm; |
| 738 | if (!valid_signal(arg) || arg < 1 || arg == SIGKILL) |
| 739 | ret = -EINVAL; |
| 740 | else { |
| 741 | spin_lock_irq(&vt_spawn_con.lock); |
| 742 | put_pid(vt_spawn_con.pid); |
| 743 | vt_spawn_con.pid = get_pid(task_pid(current)); |
| 744 | vt_spawn_con.sig = arg; |
| 745 | spin_unlock_irq(&vt_spawn_con.lock); |
| 746 | } |
| 747 | break; |
| 748 | } |
| 749 | |
| 750 | case VT_SETMODE: |
| 751 | { |
| 752 | struct vt_mode tmp; |
| 753 | |
| 754 | if (!perm) |
| 755 | goto eperm; |
| 756 | if (copy_from_user(&tmp, up, sizeof(struct vt_mode))) { |
| 757 | ret = -EFAULT; |
| 758 | goto out; |
| 759 | } |
| 760 | if (tmp.mode != VT_AUTO && tmp.mode != VT_PROCESS) { |
| 761 | ret = -EINVAL; |
| 762 | goto out; |
| 763 | } |
| 764 | acquire_console_sem(); |
| 765 | vc->vt_mode = tmp; |
| 766 | /* the frsig is ignored, so we set it to 0 */ |
| 767 | vc->vt_mode.frsig = 0; |
| 768 | put_pid(vc->vt_pid); |
| 769 | vc->vt_pid = get_pid(task_pid(current)); |
| 770 | /* no switch is required -- saw@shade.msu.ru */ |
| 771 | vc->vt_newvt = -1; |
| 772 | release_console_sem(); |
| 773 | break; |
| 774 | } |
| 775 | |
| 776 | case VT_GETMODE: |
| 777 | { |
| 778 | struct vt_mode tmp; |
| 779 | int rc; |
| 780 | |
| 781 | acquire_console_sem(); |
| 782 | memcpy(&tmp, &vc->vt_mode, sizeof(struct vt_mode)); |
| 783 | release_console_sem(); |
| 784 | |
| 785 | rc = copy_to_user(up, &tmp, sizeof(struct vt_mode)); |
| 786 | if (rc) |
| 787 | ret = -EFAULT; |
| 788 | break; |
| 789 | } |
| 790 | |
| 791 | /* |
| 792 | * Returns global vt state. Note that VT 0 is always open, since |
| 793 | * it's an alias for the current VT, and people can't use it here. |
| 794 | * We cannot return state for more than 16 VTs, since v_state is short. |
| 795 | */ |
| 796 | case VT_GETSTATE: |
| 797 | { |
| 798 | struct vt_stat __user *vtstat = up; |
| 799 | unsigned short state, mask; |
| 800 | |
| 801 | if (put_user(fg_console + 1, &vtstat->v_active)) |
| 802 | ret = -EFAULT; |
| 803 | else { |
| 804 | state = 1; /* /dev/tty0 is always open */ |
| 805 | for (i = 0, mask = 2; i < MAX_NR_CONSOLES && mask; |
| 806 | ++i, mask <<= 1) |
| 807 | if (VT_IS_IN_USE(i)) |
| 808 | state |= mask; |
| 809 | ret = put_user(state, &vtstat->v_state); |
| 810 | } |
| 811 | break; |
| 812 | } |
| 813 | |
| 814 | /* |
| 815 | * Returns the first available (non-opened) console. |
| 816 | */ |
| 817 | case VT_OPENQRY: |
| 818 | for (i = 0; i < MAX_NR_CONSOLES; ++i) |
| 819 | if (! VT_IS_IN_USE(i)) |
| 820 | break; |
| 821 | ucval = i < MAX_NR_CONSOLES ? (i+1) : -1; |
| 822 | goto setint; |
| 823 | |
| 824 | /* |
| 825 | * ioctl(fd, VT_ACTIVATE, num) will cause us to switch to vt # num, |
| 826 | * with num >= 1 (switches to vt 0, our console, are not allowed, just |
| 827 | * to preserve sanity). |
| 828 | */ |
| 829 | case VT_ACTIVATE: |
| 830 | if (!perm) |
| 831 | goto eperm; |
| 832 | if (arg == 0 || arg > MAX_NR_CONSOLES) |
| 833 | ret = -ENXIO; |
| 834 | else { |
| 835 | arg--; |
| 836 | acquire_console_sem(); |
| 837 | ret = vc_allocate(arg); |
| 838 | release_console_sem(); |
| 839 | if (ret) |
| 840 | break; |
| 841 | set_console(arg); |
| 842 | } |
| 843 | break; |
| 844 | |
| 845 | /* |
| 846 | * wait until the specified VT has been activated |
| 847 | */ |
| 848 | case VT_WAITACTIVE: |
| 849 | if (!perm) |
| 850 | goto eperm; |
| 851 | if (arg == 0 || arg > MAX_NR_CONSOLES) |
| 852 | ret = -ENXIO; |
| 853 | else |
| 854 | ret = vt_waitactive(arg - 1); |
| 855 | break; |
| 856 | |
| 857 | /* |
| 858 | * If a vt is under process control, the kernel will not switch to it |
| 859 | * immediately, but postpone the operation until the process calls this |
| 860 | * ioctl, allowing the switch to complete. |
| 861 | * |
| 862 | * According to the X sources this is the behavior: |
| 863 | * 0: pending switch-from not OK |
| 864 | * 1: pending switch-from OK |
| 865 | * 2: completed switch-to OK |
| 866 | */ |
| 867 | case VT_RELDISP: |
| 868 | if (!perm) |
| 869 | goto eperm; |
| 870 | |
| 871 | if (vc->vt_mode.mode != VT_PROCESS) { |
| 872 | ret = -EINVAL; |
| 873 | break; |
| 874 | } |
| 875 | /* |
| 876 | * Switching-from response |
| 877 | */ |
| 878 | acquire_console_sem(); |
| 879 | if (vc->vt_newvt >= 0) { |
| 880 | if (arg == 0) |
| 881 | /* |
| 882 | * Switch disallowed, so forget we were trying |
| 883 | * to do it. |
| 884 | */ |
| 885 | vc->vt_newvt = -1; |
| 886 | |
| 887 | else { |
| 888 | /* |
| 889 | * The current vt has been released, so |
| 890 | * complete the switch. |
| 891 | */ |
| 892 | int newvt; |
| 893 | newvt = vc->vt_newvt; |
| 894 | vc->vt_newvt = -1; |
| 895 | ret = vc_allocate(newvt); |
| 896 | if (ret) { |
| 897 | release_console_sem(); |
| 898 | break; |
| 899 | } |
| 900 | /* |
| 901 | * When we actually do the console switch, |
| 902 | * make sure we are atomic with respect to |
| 903 | * other console switches.. |
| 904 | */ |
| 905 | complete_change_console(vc_cons[newvt].d); |
| 906 | } |
| 907 | } else { |
| 908 | /* |
| 909 | * Switched-to response |
| 910 | */ |
| 911 | /* |
| 912 | * If it's just an ACK, ignore it |
| 913 | */ |
| 914 | if (arg != VT_ACKACQ) |
| 915 | ret = -EINVAL; |
| 916 | } |
| 917 | release_console_sem(); |
| 918 | break; |
| 919 | |
| 920 | /* |
| 921 | * Disallocate memory associated to VT (but leave VT1) |
| 922 | */ |
| 923 | case VT_DISALLOCATE: |
| 924 | if (arg > MAX_NR_CONSOLES) { |
| 925 | ret = -ENXIO; |
| 926 | break; |
| 927 | } |
| 928 | if (arg == 0) { |
| 929 | /* deallocate all unused consoles, but leave 0 */ |
| 930 | acquire_console_sem(); |
| 931 | for (i=1; i<MAX_NR_CONSOLES; i++) |
| 932 | if (! VT_BUSY(i)) |
| 933 | vc_deallocate(i); |
| 934 | release_console_sem(); |
| 935 | } else { |
| 936 | /* deallocate a single console, if possible */ |
| 937 | arg--; |
| 938 | if (VT_BUSY(arg)) |
| 939 | ret = -EBUSY; |
| 940 | else if (arg) { /* leave 0 */ |
| 941 | acquire_console_sem(); |
| 942 | vc_deallocate(arg); |
| 943 | release_console_sem(); |
| 944 | } |
| 945 | } |
| 946 | break; |
| 947 | |
| 948 | case VT_RESIZE: |
| 949 | { |
| 950 | struct vt_sizes __user *vtsizes = up; |
| 951 | struct vc_data *vc; |
| 952 | |
| 953 | ushort ll,cc; |
| 954 | if (!perm) |
| 955 | goto eperm; |
| 956 | if (get_user(ll, &vtsizes->v_rows) || |
| 957 | get_user(cc, &vtsizes->v_cols)) |
| 958 | ret = -EFAULT; |
| 959 | else { |
| 960 | acquire_console_sem(); |
| 961 | for (i = 0; i < MAX_NR_CONSOLES; i++) { |
| 962 | vc = vc_cons[i].d; |
| 963 | |
| 964 | if (vc) { |
| 965 | vc->vc_resize_user = 1; |
| 966 | vc_resize(vc_cons[i].d, cc, ll); |
| 967 | } |
| 968 | } |
| 969 | release_console_sem(); |
| 970 | } |
| 971 | break; |
| 972 | } |
| 973 | |
| 974 | case VT_RESIZEX: |
| 975 | { |
| 976 | struct vt_consize __user *vtconsize = up; |
| 977 | ushort ll,cc,vlin,clin,vcol,ccol; |
| 978 | if (!perm) |
| 979 | goto eperm; |
| 980 | if (!access_ok(VERIFY_READ, vtconsize, |
| 981 | sizeof(struct vt_consize))) { |
| 982 | ret = -EFAULT; |
| 983 | break; |
| 984 | } |
| 985 | /* FIXME: Should check the copies properly */ |
| 986 | __get_user(ll, &vtconsize->v_rows); |
| 987 | __get_user(cc, &vtconsize->v_cols); |
| 988 | __get_user(vlin, &vtconsize->v_vlin); |
| 989 | __get_user(clin, &vtconsize->v_clin); |
| 990 | __get_user(vcol, &vtconsize->v_vcol); |
| 991 | __get_user(ccol, &vtconsize->v_ccol); |
| 992 | vlin = vlin ? vlin : vc->vc_scan_lines; |
| 993 | if (clin) { |
| 994 | if (ll) { |
| 995 | if (ll != vlin/clin) { |
| 996 | /* Parameters don't add up */ |
| 997 | ret = -EINVAL; |
| 998 | break; |
| 999 | } |
| 1000 | } else |
| 1001 | ll = vlin/clin; |
| 1002 | } |
| 1003 | if (vcol && ccol) { |
| 1004 | if (cc) { |
| 1005 | if (cc != vcol/ccol) { |
| 1006 | ret = -EINVAL; |
| 1007 | break; |
| 1008 | } |
| 1009 | } else |
| 1010 | cc = vcol/ccol; |
| 1011 | } |
| 1012 | |
| 1013 | if (clin > 32) { |
| 1014 | ret = -EINVAL; |
| 1015 | break; |
| 1016 | } |
| 1017 | |
| 1018 | for (i = 0; i < MAX_NR_CONSOLES; i++) { |
| 1019 | if (!vc_cons[i].d) |
| 1020 | continue; |
| 1021 | acquire_console_sem(); |
| 1022 | if (vlin) |
| 1023 | vc_cons[i].d->vc_scan_lines = vlin; |
| 1024 | if (clin) |
| 1025 | vc_cons[i].d->vc_font.height = clin; |
| 1026 | vc_cons[i].d->vc_resize_user = 1; |
| 1027 | vc_resize(vc_cons[i].d, cc, ll); |
| 1028 | release_console_sem(); |
| 1029 | } |
| 1030 | break; |
| 1031 | } |
| 1032 | |
| 1033 | case PIO_FONT: { |
| 1034 | if (!perm) |
| 1035 | goto eperm; |
| 1036 | op.op = KD_FONT_OP_SET; |
| 1037 | op.flags = KD_FONT_FLAG_OLD | KD_FONT_FLAG_DONT_RECALC; /* Compatibility */ |
| 1038 | op.width = 8; |
| 1039 | op.height = 0; |
| 1040 | op.charcount = 256; |
| 1041 | op.data = up; |
| 1042 | ret = con_font_op(vc_cons[fg_console].d, &op); |
| 1043 | break; |
| 1044 | } |
| 1045 | |
| 1046 | case GIO_FONT: { |
| 1047 | op.op = KD_FONT_OP_GET; |
| 1048 | op.flags = KD_FONT_FLAG_OLD; |
| 1049 | op.width = 8; |
| 1050 | op.height = 32; |
| 1051 | op.charcount = 256; |
| 1052 | op.data = up; |
| 1053 | ret = con_font_op(vc_cons[fg_console].d, &op); |
| 1054 | break; |
| 1055 | } |
| 1056 | |
| 1057 | case PIO_CMAP: |
| 1058 | if (!perm) |
| 1059 | ret = -EPERM; |
| 1060 | else |
| 1061 | ret = con_set_cmap(up); |
| 1062 | break; |
| 1063 | |
| 1064 | case GIO_CMAP: |
| 1065 | ret = con_get_cmap(up); |
| 1066 | break; |
| 1067 | |
| 1068 | case PIO_FONTX: |
| 1069 | case GIO_FONTX: |
| 1070 | ret = do_fontx_ioctl(cmd, up, perm, &op); |
| 1071 | break; |
| 1072 | |
| 1073 | case PIO_FONTRESET: |
| 1074 | { |
| 1075 | if (!perm) |
| 1076 | goto eperm; |
| 1077 | |
| 1078 | #ifdef BROKEN_GRAPHICS_PROGRAMS |
| 1079 | /* With BROKEN_GRAPHICS_PROGRAMS defined, the default |
| 1080 | font is not saved. */ |
| 1081 | ret = -ENOSYS; |
| 1082 | break; |
| 1083 | #else |
| 1084 | { |
| 1085 | op.op = KD_FONT_OP_SET_DEFAULT; |
| 1086 | op.data = NULL; |
| 1087 | ret = con_font_op(vc_cons[fg_console].d, &op); |
| 1088 | if (ret) |
| 1089 | break; |
| 1090 | con_set_default_unimap(vc_cons[fg_console].d); |
| 1091 | break; |
| 1092 | } |
| 1093 | #endif |
| 1094 | } |
| 1095 | |
| 1096 | case KDFONTOP: { |
| 1097 | if (copy_from_user(&op, up, sizeof(op))) { |
| 1098 | ret = -EFAULT; |
| 1099 | break; |
| 1100 | } |
| 1101 | if (!perm && op.op != KD_FONT_OP_GET) |
| 1102 | goto eperm; |
| 1103 | ret = con_font_op(vc, &op); |
| 1104 | if (ret) |
| 1105 | break; |
| 1106 | if (copy_to_user(up, &op, sizeof(op))) |
| 1107 | ret = -EFAULT; |
| 1108 | break; |
| 1109 | } |
| 1110 | |
| 1111 | case PIO_SCRNMAP: |
| 1112 | if (!perm) |
| 1113 | ret = -EPERM; |
| 1114 | else |
| 1115 | ret = con_set_trans_old(up); |
| 1116 | break; |
| 1117 | |
| 1118 | case GIO_SCRNMAP: |
| 1119 | ret = con_get_trans_old(up); |
| 1120 | break; |
| 1121 | |
| 1122 | case PIO_UNISCRNMAP: |
| 1123 | if (!perm) |
| 1124 | ret = -EPERM; |
| 1125 | else |
| 1126 | ret = con_set_trans_new(up); |
| 1127 | break; |
| 1128 | |
| 1129 | case GIO_UNISCRNMAP: |
| 1130 | ret = con_get_trans_new(up); |
| 1131 | break; |
| 1132 | |
| 1133 | case PIO_UNIMAPCLR: |
| 1134 | { struct unimapinit ui; |
| 1135 | if (!perm) |
| 1136 | goto eperm; |
| 1137 | ret = copy_from_user(&ui, up, sizeof(struct unimapinit)); |
| 1138 | if (!ret) |
| 1139 | con_clear_unimap(vc, &ui); |
| 1140 | break; |
| 1141 | } |
| 1142 | |
| 1143 | case PIO_UNIMAP: |
| 1144 | case GIO_UNIMAP: |
| 1145 | ret = do_unimap_ioctl(cmd, up, perm, vc); |
| 1146 | break; |
| 1147 | |
| 1148 | case VT_LOCKSWITCH: |
| 1149 | if (!capable(CAP_SYS_TTY_CONFIG)) |
| 1150 | goto eperm; |
| 1151 | vt_dont_switch = 1; |
| 1152 | break; |
| 1153 | case VT_UNLOCKSWITCH: |
| 1154 | if (!capable(CAP_SYS_TTY_CONFIG)) |
| 1155 | goto eperm; |
| 1156 | vt_dont_switch = 0; |
| 1157 | break; |
| 1158 | case VT_GETHIFONTMASK: |
| 1159 | ret = put_user(vc->vc_hi_font_mask, |
| 1160 | (unsigned short __user *)arg); |
| 1161 | break; |
| 1162 | default: |
| 1163 | ret = -ENOIOCTLCMD; |
| 1164 | } |
| 1165 | out: |
| 1166 | unlock_kernel(); |
| 1167 | return ret; |
| 1168 | eperm: |
| 1169 | ret = -EPERM; |
| 1170 | goto out; |
| 1171 | } |
| 1172 | |
| 1173 | /* |
| 1174 | * Sometimes we want to wait until a particular VT has been activated. We |
| 1175 | * do it in a very simple manner. Everybody waits on a single queue and |
| 1176 | * get woken up at once. Those that are satisfied go on with their business, |
| 1177 | * while those not ready go back to sleep. Seems overkill to add a wait |
| 1178 | * to each vt just for this - usually this does nothing! |
| 1179 | */ |
| 1180 | static DECLARE_WAIT_QUEUE_HEAD(vt_activate_queue); |
| 1181 | |
| 1182 | /* |
| 1183 | * Sleeps until a vt is activated, or the task is interrupted. Returns |
| 1184 | * 0 if activation, -EINTR if interrupted by a signal handler. |
| 1185 | */ |
| 1186 | int vt_waitactive(int vt) |
| 1187 | { |
| 1188 | int retval; |
| 1189 | DECLARE_WAITQUEUE(wait, current); |
| 1190 | |
| 1191 | add_wait_queue(&vt_activate_queue, &wait); |
| 1192 | for (;;) { |
| 1193 | retval = 0; |
| 1194 | |
| 1195 | /* |
| 1196 | * Synchronize with redraw_screen(). By acquiring the console |
| 1197 | * semaphore we make sure that the console switch is completed |
| 1198 | * before we return. If we didn't wait for the semaphore, we |
| 1199 | * could return at a point where fg_console has already been |
| 1200 | * updated, but the console switch hasn't been completed. |
| 1201 | */ |
| 1202 | acquire_console_sem(); |
| 1203 | set_current_state(TASK_INTERRUPTIBLE); |
| 1204 | if (vt == fg_console) { |
| 1205 | release_console_sem(); |
| 1206 | break; |
| 1207 | } |
| 1208 | release_console_sem(); |
| 1209 | retval = -ERESTARTNOHAND; |
| 1210 | if (signal_pending(current)) |
| 1211 | break; |
| 1212 | schedule(); |
| 1213 | } |
| 1214 | remove_wait_queue(&vt_activate_queue, &wait); |
| 1215 | __set_current_state(TASK_RUNNING); |
| 1216 | return retval; |
| 1217 | } |
| 1218 | |
| 1219 | #define vt_wake_waitactive() wake_up(&vt_activate_queue) |
| 1220 | |
| 1221 | void reset_vc(struct vc_data *vc) |
| 1222 | { |
| 1223 | vc->vc_mode = KD_TEXT; |
| 1224 | kbd_table[vc->vc_num].kbdmode = default_utf8 ? VC_UNICODE : VC_XLATE; |
| 1225 | vc->vt_mode.mode = VT_AUTO; |
| 1226 | vc->vt_mode.waitv = 0; |
| 1227 | vc->vt_mode.relsig = 0; |
| 1228 | vc->vt_mode.acqsig = 0; |
| 1229 | vc->vt_mode.frsig = 0; |
| 1230 | put_pid(vc->vt_pid); |
| 1231 | vc->vt_pid = NULL; |
| 1232 | vc->vt_newvt = -1; |
| 1233 | if (!in_interrupt()) /* Via keyboard.c:SAK() - akpm */ |
| 1234 | reset_palette(vc); |
| 1235 | } |
| 1236 | |
| 1237 | void vc_SAK(struct work_struct *work) |
| 1238 | { |
| 1239 | struct vc *vc_con = |
| 1240 | container_of(work, struct vc, SAK_work); |
| 1241 | struct vc_data *vc; |
| 1242 | struct tty_struct *tty; |
| 1243 | |
| 1244 | acquire_console_sem(); |
| 1245 | vc = vc_con->d; |
| 1246 | if (vc) { |
| 1247 | tty = vc->vc_tty; |
| 1248 | /* |
| 1249 | * SAK should also work in all raw modes and reset |
| 1250 | * them properly. |
| 1251 | */ |
| 1252 | if (tty) |
| 1253 | __do_SAK(tty); |
| 1254 | reset_vc(vc); |
| 1255 | } |
| 1256 | release_console_sem(); |
| 1257 | } |
| 1258 | |
| 1259 | /* |
| 1260 | * Performs the back end of a vt switch |
| 1261 | */ |
| 1262 | static void complete_change_console(struct vc_data *vc) |
| 1263 | { |
| 1264 | unsigned char old_vc_mode; |
| 1265 | |
| 1266 | last_console = fg_console; |
| 1267 | |
| 1268 | /* |
| 1269 | * If we're switching, we could be going from KD_GRAPHICS to |
| 1270 | * KD_TEXT mode or vice versa, which means we need to blank or |
| 1271 | * unblank the screen later. |
| 1272 | */ |
| 1273 | old_vc_mode = vc_cons[fg_console].d->vc_mode; |
| 1274 | switch_screen(vc); |
| 1275 | |
| 1276 | /* |
| 1277 | * This can't appear below a successful kill_pid(). If it did, |
| 1278 | * then the *blank_screen operation could occur while X, having |
| 1279 | * received acqsig, is waking up on another processor. This |
| 1280 | * condition can lead to overlapping accesses to the VGA range |
| 1281 | * and the framebuffer (causing system lockups). |
| 1282 | * |
| 1283 | * To account for this we duplicate this code below only if the |
| 1284 | * controlling process is gone and we've called reset_vc. |
| 1285 | */ |
| 1286 | if (old_vc_mode != vc->vc_mode) { |
| 1287 | if (vc->vc_mode == KD_TEXT) |
| 1288 | do_unblank_screen(1); |
| 1289 | else |
| 1290 | do_blank_screen(1); |
| 1291 | } |
| 1292 | |
| 1293 | /* |
| 1294 | * If this new console is under process control, send it a signal |
| 1295 | * telling it that it has acquired. Also check if it has died and |
| 1296 | * clean up (similar to logic employed in change_console()) |
| 1297 | */ |
| 1298 | if (vc->vt_mode.mode == VT_PROCESS) { |
| 1299 | /* |
| 1300 | * Send the signal as privileged - kill_pid() will |
| 1301 | * tell us if the process has gone or something else |
| 1302 | * is awry |
| 1303 | */ |
| 1304 | if (kill_pid(vc->vt_pid, vc->vt_mode.acqsig, 1) != 0) { |
| 1305 | /* |
| 1306 | * The controlling process has died, so we revert back to |
| 1307 | * normal operation. In this case, we'll also change back |
| 1308 | * to KD_TEXT mode. I'm not sure if this is strictly correct |
| 1309 | * but it saves the agony when the X server dies and the screen |
| 1310 | * remains blanked due to KD_GRAPHICS! It would be nice to do |
| 1311 | * this outside of VT_PROCESS but there is no single process |
| 1312 | * to account for and tracking tty count may be undesirable. |
| 1313 | */ |
| 1314 | reset_vc(vc); |
| 1315 | |
| 1316 | if (old_vc_mode != vc->vc_mode) { |
| 1317 | if (vc->vc_mode == KD_TEXT) |
| 1318 | do_unblank_screen(1); |
| 1319 | else |
| 1320 | do_blank_screen(1); |
| 1321 | } |
| 1322 | } |
| 1323 | } |
| 1324 | |
| 1325 | /* |
| 1326 | * Wake anyone waiting for their VT to activate |
| 1327 | */ |
| 1328 | vt_wake_waitactive(); |
| 1329 | return; |
| 1330 | } |
| 1331 | |
| 1332 | /* |
| 1333 | * Performs the front-end of a vt switch |
| 1334 | */ |
| 1335 | void change_console(struct vc_data *new_vc) |
| 1336 | { |
| 1337 | struct vc_data *vc; |
| 1338 | |
| 1339 | if (!new_vc || new_vc->vc_num == fg_console || vt_dont_switch) |
| 1340 | return; |
| 1341 | |
| 1342 | /* |
| 1343 | * If this vt is in process mode, then we need to handshake with |
| 1344 | * that process before switching. Essentially, we store where that |
| 1345 | * vt wants to switch to and wait for it to tell us when it's done |
| 1346 | * (via VT_RELDISP ioctl). |
| 1347 | * |
| 1348 | * We also check to see if the controlling process still exists. |
| 1349 | * If it doesn't, we reset this vt to auto mode and continue. |
| 1350 | * This is a cheap way to track process control. The worst thing |
| 1351 | * that can happen is: we send a signal to a process, it dies, and |
| 1352 | * the switch gets "lost" waiting for a response; hopefully, the |
| 1353 | * user will try again, we'll detect the process is gone (unless |
| 1354 | * the user waits just the right amount of time :-) and revert the |
| 1355 | * vt to auto control. |
| 1356 | */ |
| 1357 | vc = vc_cons[fg_console].d; |
| 1358 | if (vc->vt_mode.mode == VT_PROCESS) { |
| 1359 | /* |
| 1360 | * Send the signal as privileged - kill_pid() will |
| 1361 | * tell us if the process has gone or something else |
| 1362 | * is awry. |
| 1363 | * |
| 1364 | * We need to set vt_newvt *before* sending the signal or we |
| 1365 | * have a race. |
| 1366 | */ |
| 1367 | vc->vt_newvt = new_vc->vc_num; |
| 1368 | if (kill_pid(vc->vt_pid, vc->vt_mode.relsig, 1) == 0) { |
| 1369 | /* |
| 1370 | * It worked. Mark the vt to switch to and |
| 1371 | * return. The process needs to send us a |
| 1372 | * VT_RELDISP ioctl to complete the switch. |
| 1373 | */ |
| 1374 | return; |
| 1375 | } |
| 1376 | |
| 1377 | /* |
| 1378 | * The controlling process has died, so we revert back to |
| 1379 | * normal operation. In this case, we'll also change back |
| 1380 | * to KD_TEXT mode. I'm not sure if this is strictly correct |
| 1381 | * but it saves the agony when the X server dies and the screen |
| 1382 | * remains blanked due to KD_GRAPHICS! It would be nice to do |
| 1383 | * this outside of VT_PROCESS but there is no single process |
| 1384 | * to account for and tracking tty count may be undesirable. |
| 1385 | */ |
| 1386 | reset_vc(vc); |
| 1387 | |
| 1388 | /* |
| 1389 | * Fall through to normal (VT_AUTO) handling of the switch... |
| 1390 | */ |
| 1391 | } |
| 1392 | |
| 1393 | /* |
| 1394 | * Ignore all switches in KD_GRAPHICS+VT_AUTO mode |
| 1395 | */ |
| 1396 | if (vc->vc_mode == KD_GRAPHICS) |
| 1397 | return; |
| 1398 | |
| 1399 | complete_change_console(new_vc); |
| 1400 | } |