Loading...
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 | // SPDX-License-Identifier: GPL-2.0 /* * ebcdic keycode functions for s390 console drivers * * S390 version * Copyright IBM Corp. 2003 * Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com), */ #include <linux/module.h> #include <linux/sched/signal.h> #include <linux/slab.h> #include <linux/sysrq.h> #include <linux/consolemap.h> #include <linux/kbd_kern.h> #include <linux/kbd_diacr.h> #include <linux/uaccess.h> #include "keyboard.h" /* * Handler Tables. */ #define K_HANDLERS\ k_self, k_fn, k_spec, k_ignore,\ k_dead, k_ignore, k_ignore, k_ignore,\ k_ignore, k_ignore, k_ignore, k_ignore,\ k_ignore, k_ignore, k_ignore, k_ignore typedef void (k_handler_fn)(struct kbd_data *, unsigned char); static k_handler_fn K_HANDLERS; static k_handler_fn *k_handler[16] = { K_HANDLERS }; /* maximum values each key_handler can handle */ static const int kbd_max_vals[] = { 255, ARRAY_SIZE(func_table) - 1, NR_FN_HANDLER - 1, 0, NR_DEAD - 1, 0, 0, 0, 0, 0, 0, 0, 0, 0 }; static const int KBD_NR_TYPES = ARRAY_SIZE(kbd_max_vals); static unsigned char ret_diacr[NR_DEAD] = { '`', '\'', '^', '~', '"', ',' }; /* * Alloc/free of kbd_data structures. */ struct kbd_data * kbd_alloc(void) { struct kbd_data *kbd; int i; kbd = kzalloc(sizeof(struct kbd_data), GFP_KERNEL); if (!kbd) goto out; kbd->key_maps = kzalloc(sizeof(key_maps), GFP_KERNEL); if (!kbd->key_maps) goto out_kbd; for (i = 0; i < ARRAY_SIZE(key_maps); i++) { if (key_maps[i]) { kbd->key_maps[i] = kmemdup(key_maps[i], sizeof(u_short) * NR_KEYS, GFP_KERNEL); if (!kbd->key_maps[i]) goto out_maps; } } kbd->func_table = kzalloc(sizeof(func_table), GFP_KERNEL); if (!kbd->func_table) goto out_maps; for (i = 0; i < ARRAY_SIZE(func_table); i++) { if (func_table[i]) { kbd->func_table[i] = kstrdup(func_table[i], GFP_KERNEL); if (!kbd->func_table[i]) goto out_func; } } kbd->fn_handler = kzalloc(sizeof(fn_handler_fn *) * NR_FN_HANDLER, GFP_KERNEL); if (!kbd->fn_handler) goto out_func; kbd->accent_table = kmemdup(accent_table, sizeof(struct kbdiacruc) * MAX_DIACR, GFP_KERNEL); if (!kbd->accent_table) goto out_fn_handler; kbd->accent_table_size = accent_table_size; return kbd; out_fn_handler: kfree(kbd->fn_handler); out_func: for (i = 0; i < ARRAY_SIZE(func_table); i++) kfree(kbd->func_table[i]); kfree(kbd->func_table); out_maps: for (i = 0; i < ARRAY_SIZE(key_maps); i++) kfree(kbd->key_maps[i]); kfree(kbd->key_maps); out_kbd: kfree(kbd); out: return NULL; } void kbd_free(struct kbd_data *kbd) { int i; kfree(kbd->accent_table); kfree(kbd->fn_handler); for (i = 0; i < ARRAY_SIZE(func_table); i++) kfree(kbd->func_table[i]); kfree(kbd->func_table); for (i = 0; i < ARRAY_SIZE(key_maps); i++) kfree(kbd->key_maps[i]); kfree(kbd->key_maps); kfree(kbd); } /* * Generate ascii -> ebcdic translation table from kbd_data. */ void kbd_ascebc(struct kbd_data *kbd, unsigned char *ascebc) { unsigned short *keymap, keysym; int i, j, k; memset(ascebc, 0x40, 256); for (i = 0; i < ARRAY_SIZE(key_maps); i++) { keymap = kbd->key_maps[i]; if (!keymap) continue; for (j = 0; j < NR_KEYS; j++) { k = ((i & 1) << 7) + j; keysym = keymap[j]; if (KTYP(keysym) == (KT_LATIN | 0xf0) || KTYP(keysym) == (KT_LETTER | 0xf0)) ascebc[KVAL(keysym)] = k; else if (KTYP(keysym) == (KT_DEAD | 0xf0)) ascebc[ret_diacr[KVAL(keysym)]] = k; } } } #if 0 /* * Generate ebcdic -> ascii translation table from kbd_data. */ void kbd_ebcasc(struct kbd_data *kbd, unsigned char *ebcasc) { unsigned short *keymap, keysym; int i, j, k; memset(ebcasc, ' ', 256); for (i = 0; i < ARRAY_SIZE(key_maps); i++) { keymap = kbd->key_maps[i]; if (!keymap) continue; for (j = 0; j < NR_KEYS; j++) { keysym = keymap[j]; k = ((i & 1) << 7) + j; if (KTYP(keysym) == (KT_LATIN | 0xf0) || KTYP(keysym) == (KT_LETTER | 0xf0)) ebcasc[k] = KVAL(keysym); else if (KTYP(keysym) == (KT_DEAD | 0xf0)) ebcasc[k] = ret_diacr[KVAL(keysym)]; } } } #endif /* * We have a combining character DIACR here, followed by the character CH. * If the combination occurs in the table, return the corresponding value. * Otherwise, if CH is a space or equals DIACR, return DIACR. * Otherwise, conclude that DIACR was not combining after all, * queue it and return CH. */ static unsigned int handle_diacr(struct kbd_data *kbd, unsigned int ch) { int i, d; d = kbd->diacr; kbd->diacr = 0; for (i = 0; i < kbd->accent_table_size; i++) { if (kbd->accent_table[i].diacr == d && kbd->accent_table[i].base == ch) return kbd->accent_table[i].result; } if (ch == ' ' || ch == d) return d; kbd_put_queue(kbd->port, d); return ch; } /* * Handle dead key. */ static void k_dead(struct kbd_data *kbd, unsigned char value) { value = ret_diacr[value]; kbd->diacr = (kbd->diacr ? handle_diacr(kbd, value) : value); } /* * Normal character handler. */ static void k_self(struct kbd_data *kbd, unsigned char value) { if (kbd->diacr) value = handle_diacr(kbd, value); kbd_put_queue(kbd->port, value); } /* * Special key handlers */ static void k_ignore(struct kbd_data *kbd, unsigned char value) { } /* * Function key handler. */ static void k_fn(struct kbd_data *kbd, unsigned char value) { if (kbd->func_table[value]) kbd_puts_queue(kbd->port, kbd->func_table[value]); } static void k_spec(struct kbd_data *kbd, unsigned char value) { if (value >= NR_FN_HANDLER) return; if (kbd->fn_handler[value]) kbd->fn_handler[value](kbd); } /* * Put utf8 character to tty flip buffer. * UTF-8 is defined for words of up to 31 bits, * but we need only 16 bits here */ static void to_utf8(struct tty_port *port, ushort c) { if (c < 0x80) /* 0******* */ kbd_put_queue(port, c); else if (c < 0x800) { /* 110***** 10****** */ kbd_put_queue(port, 0xc0 | (c >> 6)); kbd_put_queue(port, 0x80 | (c & 0x3f)); } else { /* 1110**** 10****** 10****** */ kbd_put_queue(port, 0xe0 | (c >> 12)); kbd_put_queue(port, 0x80 | ((c >> 6) & 0x3f)); kbd_put_queue(port, 0x80 | (c & 0x3f)); } } /* * Process keycode. */ void kbd_keycode(struct kbd_data *kbd, unsigned int keycode) { unsigned short keysym; unsigned char type, value; if (!kbd) return; if (keycode >= 384) keysym = kbd->key_maps[5][keycode - 384]; else if (keycode >= 256) keysym = kbd->key_maps[4][keycode - 256]; else if (keycode >= 128) keysym = kbd->key_maps[1][keycode - 128]; else keysym = kbd->key_maps[0][keycode]; type = KTYP(keysym); if (type >= 0xf0) { type -= 0xf0; if (type == KT_LETTER) type = KT_LATIN; value = KVAL(keysym); #ifdef CONFIG_MAGIC_SYSRQ /* Handle the SysRq Hack */ if (kbd->sysrq) { if (kbd->sysrq == K(KT_LATIN, '-')) { kbd->sysrq = 0; handle_sysrq(value); return; } if (value == '-') { kbd->sysrq = K(KT_LATIN, '-'); return; } /* Incomplete sysrq sequence. */ (*k_handler[KTYP(kbd->sysrq)])(kbd, KVAL(kbd->sysrq)); kbd->sysrq = 0; } else if ((type == KT_LATIN && value == '^') || (type == KT_DEAD && ret_diacr[value] == '^')) { kbd->sysrq = K(type, value); return; } #endif (*k_handler[type])(kbd, value); } else to_utf8(kbd->port, keysym); } /* * Ioctl stuff. */ static int do_kdsk_ioctl(struct kbd_data *kbd, struct kbentry __user *user_kbe, int cmd, int perm) { struct kbentry tmp; ushort *key_map, val, ov; if (copy_from_user(&tmp, user_kbe, sizeof(struct kbentry))) return -EFAULT; #if NR_KEYS < 256 if (tmp.kb_index >= NR_KEYS) return -EINVAL; #endif #if MAX_NR_KEYMAPS < 256 if (tmp.kb_table >= MAX_NR_KEYMAPS) return -EINVAL; #endif switch (cmd) { case KDGKBENT: key_map = kbd->key_maps[tmp.kb_table]; if (key_map) { val = U(key_map[tmp.kb_index]); if (KTYP(val) >= KBD_NR_TYPES) val = K_HOLE; } else val = (tmp.kb_index ? K_HOLE : K_NOSUCHMAP); return put_user(val, &user_kbe->kb_value); case KDSKBENT: if (!perm) return -EPERM; if (!tmp.kb_index && tmp.kb_value == K_NOSUCHMAP) { /* disallocate map */ key_map = kbd->key_maps[tmp.kb_table]; if (key_map) { kbd->key_maps[tmp.kb_table] = NULL; kfree(key_map); } break; } if (KTYP(tmp.kb_value) >= KBD_NR_TYPES) return -EINVAL; if (KVAL(tmp.kb_value) > kbd_max_vals[KTYP(tmp.kb_value)]) return -EINVAL; if (!(key_map = kbd->key_maps[tmp.kb_table])) { int j; key_map = kmalloc(sizeof(plain_map), GFP_KERNEL); if (!key_map) return -ENOMEM; kbd->key_maps[tmp.kb_table] = key_map; for (j = 0; j < NR_KEYS; j++) key_map[j] = U(K_HOLE); } ov = U(key_map[tmp.kb_index]); if (tmp.kb_value == ov) break; /* nothing to do */ /* * Attention Key. */ if (((ov == K_SAK) || (tmp.kb_value == K_SAK)) && !capable(CAP_SYS_ADMIN)) return -EPERM; key_map[tmp.kb_index] = U(tmp.kb_value); break; } return 0; } static int do_kdgkb_ioctl(struct kbd_data *kbd, struct kbsentry __user *u_kbs, int cmd, int perm) { unsigned char kb_func; char *p; int len; /* Get u_kbs->kb_func. */ if (get_user(kb_func, &u_kbs->kb_func)) return -EFAULT; #if MAX_NR_FUNC < 256 if (kb_func >= MAX_NR_FUNC) return -EINVAL; #endif switch (cmd) { case KDGKBSENT: p = kbd->func_table[kb_func]; if (p) { len = strlen(p); if (len >= sizeof(u_kbs->kb_string)) len = sizeof(u_kbs->kb_string) - 1; if (copy_to_user(u_kbs->kb_string, p, len)) return -EFAULT; } else len = 0; if (put_user('\0', u_kbs->kb_string + len)) return -EFAULT; break; case KDSKBSENT: if (!perm) return -EPERM; p = strndup_user(u_kbs->kb_string, sizeof(u_kbs->kb_string)); if (IS_ERR(p)) return PTR_ERR(p); kfree(kbd->func_table[kb_func]); kbd->func_table[kb_func] = p; break; } return 0; } int kbd_ioctl(struct kbd_data *kbd, unsigned int cmd, unsigned long arg) { struct tty_struct *tty; void __user *argp; unsigned int ct; int perm; argp = (void __user *)arg; /* * To have permissions to do most of the vt ioctls, we either have * to be the owner of the tty, or have CAP_SYS_TTY_CONFIG. */ tty = tty_port_tty_get(kbd->port); /* FIXME this test is pretty racy */ perm = current->signal->tty == tty || capable(CAP_SYS_TTY_CONFIG); tty_kref_put(tty); switch (cmd) { case KDGKBTYPE: return put_user(KB_101, (char __user *)argp); case KDGKBENT: case KDSKBENT: return do_kdsk_ioctl(kbd, argp, cmd, perm); case KDGKBSENT: case KDSKBSENT: return do_kdgkb_ioctl(kbd, argp, cmd, perm); case KDGKBDIACR: { struct kbdiacrs __user *a = argp; struct kbdiacr diacr; int i; if (put_user(kbd->accent_table_size, &a->kb_cnt)) return -EFAULT; for (i = 0; i < kbd->accent_table_size; i++) { diacr.diacr = kbd->accent_table[i].diacr; diacr.base = kbd->accent_table[i].base; diacr.result = kbd->accent_table[i].result; if (copy_to_user(a->kbdiacr + i, &diacr, sizeof(struct kbdiacr))) return -EFAULT; } return 0; } case KDGKBDIACRUC: { struct kbdiacrsuc __user *a = argp; ct = kbd->accent_table_size; if (put_user(ct, &a->kb_cnt)) return -EFAULT; if (copy_to_user(a->kbdiacruc, kbd->accent_table, ct * sizeof(struct kbdiacruc))) return -EFAULT; return 0; } case KDSKBDIACR: { struct kbdiacrs __user *a = argp; struct kbdiacr diacr; int i; if (!perm) return -EPERM; if (get_user(ct, &a->kb_cnt)) return -EFAULT; if (ct >= MAX_DIACR) return -EINVAL; kbd->accent_table_size = ct; for (i = 0; i < ct; i++) { if (copy_from_user(&diacr, a->kbdiacr + i, sizeof(struct kbdiacr))) return -EFAULT; kbd->accent_table[i].diacr = diacr.diacr; kbd->accent_table[i].base = diacr.base; kbd->accent_table[i].result = diacr.result; } return 0; } case KDSKBDIACRUC: { struct kbdiacrsuc __user *a = argp; if (!perm) return -EPERM; if (get_user(ct, &a->kb_cnt)) return -EFAULT; if (ct >= MAX_DIACR) return -EINVAL; kbd->accent_table_size = ct; if (copy_from_user(kbd->accent_table, a->kbdiacruc, ct * sizeof(struct kbdiacruc))) return -EFAULT; return 0; } default: return -ENOIOCTLCMD; } } EXPORT_SYMBOL(kbd_ioctl); EXPORT_SYMBOL(kbd_ascebc); EXPORT_SYMBOL(kbd_free); EXPORT_SYMBOL(kbd_alloc); EXPORT_SYMBOL(kbd_keycode); |