Ivan Hu | ff6301d | 2016-08-25 11:15:31 +0800 | [diff] [blame] | 1 | /* |
| 2 | * EFI Test Driver for Runtime Services |
| 3 | * |
| 4 | * Copyright(C) 2012-2016 Canonical Ltd. |
| 5 | * |
| 6 | * This driver exports EFI runtime services interfaces into userspace, which |
| 7 | * allow to use and test UEFI runtime services provided by firmware. |
| 8 | * |
| 9 | */ |
| 10 | |
| 11 | #include <linux/version.h> |
| 12 | #include <linux/miscdevice.h> |
| 13 | #include <linux/module.h> |
| 14 | #include <linux/init.h> |
| 15 | #include <linux/proc_fs.h> |
| 16 | #include <linux/efi.h> |
| 17 | #include <linux/slab.h> |
| 18 | #include <linux/uaccess.h> |
| 19 | |
| 20 | #include "efi_test.h" |
| 21 | |
| 22 | MODULE_AUTHOR("Ivan Hu <ivan.hu@canonical.com>"); |
| 23 | MODULE_DESCRIPTION("EFI Test Driver"); |
| 24 | MODULE_LICENSE("GPL"); |
| 25 | |
| 26 | /* |
| 27 | * Count the bytes in 'str', including the terminating NULL. |
| 28 | * |
| 29 | * Note this function returns the number of *bytes*, not the number of |
| 30 | * ucs2 characters. |
| 31 | */ |
| 32 | static inline size_t user_ucs2_strsize(efi_char16_t __user *str) |
| 33 | { |
| 34 | efi_char16_t *s = str, c; |
| 35 | size_t len; |
| 36 | |
| 37 | if (!str) |
| 38 | return 0; |
| 39 | |
| 40 | /* Include terminating NULL */ |
| 41 | len = sizeof(efi_char16_t); |
| 42 | |
| 43 | if (get_user(c, s++)) { |
| 44 | /* Can't read userspace memory for size */ |
| 45 | return 0; |
| 46 | } |
| 47 | |
| 48 | while (c != 0) { |
| 49 | if (get_user(c, s++)) { |
| 50 | /* Can't read userspace memory for size */ |
| 51 | return 0; |
| 52 | } |
| 53 | len += sizeof(efi_char16_t); |
| 54 | } |
| 55 | return len; |
| 56 | } |
| 57 | |
| 58 | /* |
| 59 | * Allocate a buffer and copy a ucs2 string from user space into it. |
| 60 | */ |
| 61 | static inline int |
| 62 | copy_ucs2_from_user_len(efi_char16_t **dst, efi_char16_t __user *src, |
| 63 | size_t len) |
| 64 | { |
| 65 | efi_char16_t *buf; |
| 66 | |
| 67 | if (!src) { |
| 68 | *dst = NULL; |
| 69 | return 0; |
| 70 | } |
| 71 | |
| 72 | if (!access_ok(VERIFY_READ, src, 1)) |
| 73 | return -EFAULT; |
| 74 | |
| 75 | buf = kmalloc(len, GFP_KERNEL); |
| 76 | if (!buf) { |
| 77 | *dst = NULL; |
| 78 | return -ENOMEM; |
| 79 | } |
| 80 | *dst = buf; |
| 81 | |
| 82 | if (copy_from_user(*dst, src, len)) { |
| 83 | kfree(buf); |
| 84 | return -EFAULT; |
| 85 | } |
| 86 | |
| 87 | return 0; |
| 88 | } |
| 89 | |
| 90 | /* |
| 91 | * Count the bytes in 'str', including the terminating NULL. |
| 92 | * |
| 93 | * Just a wrap for user_ucs2_strsize |
| 94 | */ |
| 95 | static inline int |
| 96 | get_ucs2_strsize_from_user(efi_char16_t __user *src, size_t *len) |
| 97 | { |
| 98 | if (!access_ok(VERIFY_READ, src, 1)) |
| 99 | return -EFAULT; |
| 100 | |
| 101 | *len = user_ucs2_strsize(src); |
| 102 | if (*len == 0) |
| 103 | return -EFAULT; |
| 104 | |
| 105 | return 0; |
| 106 | } |
| 107 | |
| 108 | /* |
| 109 | * Calculate the required buffer allocation size and copy a ucs2 string |
| 110 | * from user space into it. |
| 111 | * |
| 112 | * This function differs from copy_ucs2_from_user_len() because it |
| 113 | * calculates the size of the buffer to allocate by taking the length of |
| 114 | * the string 'src'. |
| 115 | * |
| 116 | * If a non-zero value is returned, the caller MUST NOT access 'dst'. |
| 117 | * |
| 118 | * It is the caller's responsibility to free 'dst'. |
| 119 | */ |
| 120 | static inline int |
| 121 | copy_ucs2_from_user(efi_char16_t **dst, efi_char16_t __user *src) |
| 122 | { |
| 123 | size_t len; |
| 124 | |
| 125 | if (!access_ok(VERIFY_READ, src, 1)) |
| 126 | return -EFAULT; |
| 127 | |
| 128 | len = user_ucs2_strsize(src); |
| 129 | if (len == 0) |
| 130 | return -EFAULT; |
| 131 | return copy_ucs2_from_user_len(dst, src, len); |
| 132 | } |
| 133 | |
| 134 | /* |
| 135 | * Copy a ucs2 string to a user buffer. |
| 136 | * |
| 137 | * This function is a simple wrapper around copy_to_user() that does |
| 138 | * nothing if 'src' is NULL, which is useful for reducing the amount of |
| 139 | * NULL checking the caller has to do. |
| 140 | * |
| 141 | * 'len' specifies the number of bytes to copy. |
| 142 | */ |
| 143 | static inline int |
| 144 | copy_ucs2_to_user_len(efi_char16_t __user *dst, efi_char16_t *src, size_t len) |
| 145 | { |
| 146 | if (!src) |
| 147 | return 0; |
| 148 | |
| 149 | if (!access_ok(VERIFY_WRITE, dst, 1)) |
| 150 | return -EFAULT; |
| 151 | |
| 152 | return copy_to_user(dst, src, len); |
| 153 | } |
| 154 | |
| 155 | static long efi_runtime_get_variable(unsigned long arg) |
| 156 | { |
| 157 | struct efi_getvariable __user *getvariable_user; |
| 158 | struct efi_getvariable getvariable; |
| 159 | unsigned long datasize, prev_datasize, *dz; |
| 160 | efi_guid_t vendor_guid, *vd = NULL; |
| 161 | efi_status_t status; |
| 162 | efi_char16_t *name = NULL; |
| 163 | u32 attr, *at; |
| 164 | void *data = NULL; |
| 165 | int rv = 0; |
| 166 | |
| 167 | getvariable_user = (struct efi_getvariable __user *)arg; |
| 168 | |
| 169 | if (copy_from_user(&getvariable, getvariable_user, |
| 170 | sizeof(getvariable))) |
| 171 | return -EFAULT; |
| 172 | if (getvariable.data_size && |
| 173 | get_user(datasize, getvariable.data_size)) |
| 174 | return -EFAULT; |
| 175 | if (getvariable.vendor_guid) { |
| 176 | if (copy_from_user(&vendor_guid, getvariable.vendor_guid, |
| 177 | sizeof(vendor_guid))) |
| 178 | return -EFAULT; |
| 179 | vd = &vendor_guid; |
| 180 | } |
| 181 | |
| 182 | if (getvariable.variable_name) { |
| 183 | rv = copy_ucs2_from_user(&name, getvariable.variable_name); |
| 184 | if (rv) |
| 185 | return rv; |
| 186 | } |
| 187 | |
| 188 | at = getvariable.attributes ? &attr : NULL; |
| 189 | dz = getvariable.data_size ? &datasize : NULL; |
| 190 | |
| 191 | if (getvariable.data_size && getvariable.data) { |
| 192 | data = kmalloc(datasize, GFP_KERNEL); |
| 193 | if (!data) { |
| 194 | kfree(name); |
| 195 | return -ENOMEM; |
| 196 | } |
| 197 | } |
| 198 | |
| 199 | prev_datasize = datasize; |
| 200 | status = efi.get_variable(name, vd, at, dz, data); |
| 201 | kfree(name); |
| 202 | |
| 203 | if (put_user(status, getvariable.status)) { |
| 204 | rv = -EFAULT; |
| 205 | goto out; |
| 206 | } |
| 207 | |
| 208 | if (status != EFI_SUCCESS) { |
| 209 | if (status == EFI_BUFFER_TOO_SMALL) { |
| 210 | if (dz && put_user(datasize, getvariable.data_size)) { |
| 211 | rv = -EFAULT; |
| 212 | goto out; |
| 213 | } |
| 214 | } |
| 215 | rv = -EINVAL; |
| 216 | goto out; |
| 217 | } |
| 218 | |
| 219 | if (prev_datasize < datasize) { |
| 220 | rv = -EINVAL; |
| 221 | goto out; |
| 222 | } |
| 223 | |
| 224 | if (data) { |
| 225 | if (copy_to_user(getvariable.data, data, datasize)) { |
| 226 | rv = -EFAULT; |
| 227 | goto out; |
| 228 | } |
| 229 | } |
| 230 | |
| 231 | if (at && put_user(attr, getvariable.attributes)) { |
| 232 | rv = -EFAULT; |
| 233 | goto out; |
| 234 | } |
| 235 | |
| 236 | if (dz && put_user(datasize, getvariable.data_size)) |
| 237 | rv = -EFAULT; |
| 238 | |
| 239 | out: |
| 240 | kfree(data); |
| 241 | return rv; |
| 242 | |
| 243 | } |
| 244 | |
| 245 | static long efi_runtime_set_variable(unsigned long arg) |
| 246 | { |
| 247 | struct efi_setvariable __user *setvariable_user; |
| 248 | struct efi_setvariable setvariable; |
| 249 | efi_guid_t vendor_guid; |
| 250 | efi_status_t status; |
| 251 | efi_char16_t *name = NULL; |
| 252 | void *data; |
| 253 | int rv = 0; |
| 254 | |
| 255 | setvariable_user = (struct efi_setvariable __user *)arg; |
| 256 | |
| 257 | if (copy_from_user(&setvariable, setvariable_user, sizeof(setvariable))) |
| 258 | return -EFAULT; |
| 259 | if (copy_from_user(&vendor_guid, setvariable.vendor_guid, |
| 260 | sizeof(vendor_guid))) |
| 261 | return -EFAULT; |
| 262 | |
| 263 | if (setvariable.variable_name) { |
| 264 | rv = copy_ucs2_from_user(&name, setvariable.variable_name); |
| 265 | if (rv) |
| 266 | return rv; |
| 267 | } |
| 268 | |
| 269 | data = kmalloc(setvariable.data_size, GFP_KERNEL); |
| 270 | if (!data) { |
| 271 | kfree(name); |
| 272 | return -ENOMEM; |
| 273 | } |
| 274 | if (copy_from_user(data, setvariable.data, setvariable.data_size)) { |
| 275 | rv = -EFAULT; |
| 276 | goto out; |
| 277 | } |
| 278 | |
| 279 | status = efi.set_variable(name, &vendor_guid, |
| 280 | setvariable.attributes, |
| 281 | setvariable.data_size, data); |
| 282 | |
| 283 | if (put_user(status, setvariable.status)) { |
| 284 | rv = -EFAULT; |
| 285 | goto out; |
| 286 | } |
| 287 | |
| 288 | rv = status == EFI_SUCCESS ? 0 : -EINVAL; |
| 289 | |
| 290 | out: |
| 291 | kfree(data); |
| 292 | kfree(name); |
| 293 | |
| 294 | return rv; |
| 295 | } |
| 296 | |
| 297 | static long efi_runtime_get_time(unsigned long arg) |
| 298 | { |
| 299 | struct efi_gettime __user *gettime_user; |
| 300 | struct efi_gettime gettime; |
| 301 | efi_status_t status; |
| 302 | efi_time_cap_t cap; |
| 303 | efi_time_t efi_time; |
| 304 | |
| 305 | gettime_user = (struct efi_gettime __user *)arg; |
| 306 | if (copy_from_user(&gettime, gettime_user, sizeof(gettime))) |
| 307 | return -EFAULT; |
| 308 | |
| 309 | status = efi.get_time(gettime.time ? &efi_time : NULL, |
| 310 | gettime.capabilities ? &cap : NULL); |
| 311 | |
| 312 | if (put_user(status, gettime.status)) |
| 313 | return -EFAULT; |
| 314 | |
| 315 | if (status != EFI_SUCCESS) |
| 316 | return -EINVAL; |
| 317 | |
| 318 | if (gettime.capabilities) { |
| 319 | efi_time_cap_t __user *cap_local; |
| 320 | |
| 321 | cap_local = (efi_time_cap_t *)gettime.capabilities; |
| 322 | if (put_user(cap.resolution, &(cap_local->resolution)) || |
| 323 | put_user(cap.accuracy, &(cap_local->accuracy)) || |
| 324 | put_user(cap.sets_to_zero, &(cap_local->sets_to_zero))) |
| 325 | return -EFAULT; |
| 326 | } |
| 327 | if (gettime.time) { |
| 328 | if (copy_to_user(gettime.time, &efi_time, sizeof(efi_time_t))) |
| 329 | return -EFAULT; |
| 330 | } |
| 331 | |
| 332 | return 0; |
| 333 | } |
| 334 | |
| 335 | static long efi_runtime_set_time(unsigned long arg) |
| 336 | { |
| 337 | struct efi_settime __user *settime_user; |
| 338 | struct efi_settime settime; |
| 339 | efi_status_t status; |
| 340 | efi_time_t efi_time; |
| 341 | |
| 342 | settime_user = (struct efi_settime __user *)arg; |
| 343 | if (copy_from_user(&settime, settime_user, sizeof(settime))) |
| 344 | return -EFAULT; |
| 345 | if (copy_from_user(&efi_time, settime.time, |
| 346 | sizeof(efi_time_t))) |
| 347 | return -EFAULT; |
| 348 | status = efi.set_time(&efi_time); |
| 349 | |
| 350 | if (put_user(status, settime.status)) |
| 351 | return -EFAULT; |
| 352 | |
| 353 | return status == EFI_SUCCESS ? 0 : -EINVAL; |
| 354 | } |
| 355 | |
| 356 | static long efi_runtime_get_waketime(unsigned long arg) |
| 357 | { |
| 358 | struct efi_getwakeuptime __user *getwakeuptime_user; |
| 359 | struct efi_getwakeuptime getwakeuptime; |
| 360 | efi_bool_t enabled, pending; |
| 361 | efi_status_t status; |
| 362 | efi_time_t efi_time; |
| 363 | |
| 364 | getwakeuptime_user = (struct efi_getwakeuptime __user *)arg; |
| 365 | if (copy_from_user(&getwakeuptime, getwakeuptime_user, |
| 366 | sizeof(getwakeuptime))) |
| 367 | return -EFAULT; |
| 368 | |
| 369 | status = efi.get_wakeup_time( |
| 370 | getwakeuptime.enabled ? (efi_bool_t *)&enabled : NULL, |
| 371 | getwakeuptime.pending ? (efi_bool_t *)&pending : NULL, |
| 372 | getwakeuptime.time ? &efi_time : NULL); |
| 373 | |
| 374 | if (put_user(status, getwakeuptime.status)) |
| 375 | return -EFAULT; |
| 376 | |
| 377 | if (status != EFI_SUCCESS) |
| 378 | return -EINVAL; |
| 379 | |
| 380 | if (getwakeuptime.enabled && put_user(enabled, |
| 381 | getwakeuptime.enabled)) |
| 382 | return -EFAULT; |
| 383 | |
| 384 | if (getwakeuptime.time) { |
| 385 | if (copy_to_user(getwakeuptime.time, &efi_time, |
| 386 | sizeof(efi_time_t))) |
| 387 | return -EFAULT; |
| 388 | } |
| 389 | |
| 390 | return 0; |
| 391 | } |
| 392 | |
| 393 | static long efi_runtime_set_waketime(unsigned long arg) |
| 394 | { |
| 395 | struct efi_setwakeuptime __user *setwakeuptime_user; |
| 396 | struct efi_setwakeuptime setwakeuptime; |
| 397 | efi_bool_t enabled; |
| 398 | efi_status_t status; |
| 399 | efi_time_t efi_time; |
| 400 | |
| 401 | setwakeuptime_user = (struct efi_setwakeuptime __user *)arg; |
| 402 | |
| 403 | if (copy_from_user(&setwakeuptime, setwakeuptime_user, |
| 404 | sizeof(setwakeuptime))) |
| 405 | return -EFAULT; |
| 406 | |
| 407 | enabled = setwakeuptime.enabled; |
| 408 | if (setwakeuptime.time) { |
| 409 | if (copy_from_user(&efi_time, setwakeuptime.time, |
| 410 | sizeof(efi_time_t))) |
| 411 | return -EFAULT; |
| 412 | |
| 413 | status = efi.set_wakeup_time(enabled, &efi_time); |
| 414 | } else |
| 415 | status = efi.set_wakeup_time(enabled, NULL); |
| 416 | |
| 417 | if (put_user(status, setwakeuptime.status)) |
| 418 | return -EFAULT; |
| 419 | |
| 420 | return status == EFI_SUCCESS ? 0 : -EINVAL; |
| 421 | } |
| 422 | |
| 423 | static long efi_runtime_get_nextvariablename(unsigned long arg) |
| 424 | { |
| 425 | struct efi_getnextvariablename __user *getnextvariablename_user; |
| 426 | struct efi_getnextvariablename getnextvariablename; |
| 427 | unsigned long name_size, prev_name_size = 0, *ns = NULL; |
| 428 | efi_status_t status; |
| 429 | efi_guid_t *vd = NULL; |
| 430 | efi_guid_t vendor_guid; |
| 431 | efi_char16_t *name = NULL; |
| 432 | int rv; |
| 433 | |
| 434 | getnextvariablename_user = (struct efi_getnextvariablename __user *)arg; |
| 435 | |
| 436 | if (copy_from_user(&getnextvariablename, getnextvariablename_user, |
| 437 | sizeof(getnextvariablename))) |
| 438 | return -EFAULT; |
| 439 | |
| 440 | if (getnextvariablename.variable_name_size) { |
| 441 | if (get_user(name_size, getnextvariablename.variable_name_size)) |
| 442 | return -EFAULT; |
| 443 | ns = &name_size; |
| 444 | prev_name_size = name_size; |
| 445 | } |
| 446 | |
| 447 | if (getnextvariablename.vendor_guid) { |
| 448 | if (copy_from_user(&vendor_guid, |
| 449 | getnextvariablename.vendor_guid, |
| 450 | sizeof(vendor_guid))) |
| 451 | return -EFAULT; |
| 452 | vd = &vendor_guid; |
| 453 | } |
| 454 | |
| 455 | if (getnextvariablename.variable_name) { |
| 456 | size_t name_string_size = 0; |
| 457 | |
| 458 | rv = get_ucs2_strsize_from_user( |
| 459 | getnextvariablename.variable_name, |
| 460 | &name_string_size); |
| 461 | if (rv) |
| 462 | return rv; |
| 463 | /* |
| 464 | * The name_size may be smaller than the real buffer size where |
| 465 | * variable name located in some use cases. The most typical |
| 466 | * case is passing a 0 to get the required buffer size for the |
| 467 | * 1st time call. So we need to copy the content from user |
| 468 | * space for at least the string size of variable name, or else |
| 469 | * the name passed to UEFI may not be terminated as we expected. |
| 470 | */ |
| 471 | rv = copy_ucs2_from_user_len(&name, |
| 472 | getnextvariablename.variable_name, |
| 473 | prev_name_size > name_string_size ? |
| 474 | prev_name_size : name_string_size); |
| 475 | if (rv) |
| 476 | return rv; |
| 477 | } |
| 478 | |
| 479 | status = efi.get_next_variable(ns, name, vd); |
| 480 | |
| 481 | if (put_user(status, getnextvariablename.status)) { |
| 482 | rv = -EFAULT; |
| 483 | goto out; |
| 484 | } |
| 485 | |
| 486 | if (status != EFI_SUCCESS) { |
| 487 | if (status == EFI_BUFFER_TOO_SMALL) { |
| 488 | if (ns && put_user(*ns, |
| 489 | getnextvariablename.variable_name_size)) { |
| 490 | rv = -EFAULT; |
| 491 | goto out; |
| 492 | } |
| 493 | } |
| 494 | rv = -EINVAL; |
| 495 | goto out; |
| 496 | } |
| 497 | |
| 498 | if (name) { |
| 499 | if (copy_ucs2_to_user_len(getnextvariablename.variable_name, |
| 500 | name, prev_name_size)) { |
| 501 | rv = -EFAULT; |
| 502 | goto out; |
| 503 | } |
| 504 | } |
| 505 | |
| 506 | if (ns) { |
| 507 | if (put_user(*ns, getnextvariablename.variable_name_size)) { |
| 508 | rv = -EFAULT; |
| 509 | goto out; |
| 510 | } |
| 511 | } |
| 512 | |
| 513 | if (vd) { |
| 514 | if (copy_to_user(getnextvariablename.vendor_guid, vd, |
| 515 | sizeof(efi_guid_t))) |
| 516 | rv = -EFAULT; |
| 517 | } |
| 518 | |
| 519 | out: |
| 520 | kfree(name); |
| 521 | return rv; |
| 522 | } |
| 523 | |
| 524 | static long efi_runtime_get_nexthighmonocount(unsigned long arg) |
| 525 | { |
| 526 | struct efi_getnexthighmonotoniccount __user *getnexthighmonocount_user; |
| 527 | struct efi_getnexthighmonotoniccount getnexthighmonocount; |
| 528 | efi_status_t status; |
| 529 | u32 count; |
| 530 | |
| 531 | getnexthighmonocount_user = (struct |
| 532 | efi_getnexthighmonotoniccount __user *)arg; |
| 533 | |
| 534 | if (copy_from_user(&getnexthighmonocount, |
| 535 | getnexthighmonocount_user, |
| 536 | sizeof(getnexthighmonocount))) |
| 537 | return -EFAULT; |
| 538 | |
| 539 | status = efi.get_next_high_mono_count( |
| 540 | getnexthighmonocount.high_count ? &count : NULL); |
| 541 | |
| 542 | if (put_user(status, getnexthighmonocount.status)) |
| 543 | return -EFAULT; |
| 544 | |
| 545 | if (status != EFI_SUCCESS) |
| 546 | return -EINVAL; |
| 547 | |
| 548 | if (getnexthighmonocount.high_count && |
| 549 | put_user(count, getnexthighmonocount.high_count)) |
| 550 | return -EFAULT; |
| 551 | |
| 552 | return 0; |
| 553 | } |
| 554 | |
| 555 | static long efi_runtime_query_variableinfo(unsigned long arg) |
| 556 | { |
| 557 | struct efi_queryvariableinfo __user *queryvariableinfo_user; |
| 558 | struct efi_queryvariableinfo queryvariableinfo; |
| 559 | efi_status_t status; |
| 560 | u64 max_storage, remaining, max_size; |
| 561 | |
| 562 | queryvariableinfo_user = (struct efi_queryvariableinfo __user *)arg; |
| 563 | |
| 564 | if (copy_from_user(&queryvariableinfo, queryvariableinfo_user, |
| 565 | sizeof(queryvariableinfo))) |
| 566 | return -EFAULT; |
| 567 | |
| 568 | status = efi.query_variable_info(queryvariableinfo.attributes, |
| 569 | &max_storage, &remaining, &max_size); |
| 570 | |
| 571 | if (put_user(status, queryvariableinfo.status)) |
| 572 | return -EFAULT; |
| 573 | |
| 574 | if (status != EFI_SUCCESS) |
| 575 | return -EINVAL; |
| 576 | |
| 577 | if (put_user(max_storage, |
| 578 | queryvariableinfo.maximum_variable_storage_size)) |
| 579 | return -EFAULT; |
| 580 | |
| 581 | if (put_user(remaining, |
| 582 | queryvariableinfo.remaining_variable_storage_size)) |
| 583 | return -EFAULT; |
| 584 | |
| 585 | if (put_user(max_size, queryvariableinfo.maximum_variable_size)) |
| 586 | return -EFAULT; |
| 587 | |
| 588 | return 0; |
| 589 | } |
| 590 | |
| 591 | static long efi_runtime_query_capsulecaps(unsigned long arg) |
| 592 | { |
| 593 | struct efi_querycapsulecapabilities __user *qcaps_user; |
| 594 | struct efi_querycapsulecapabilities qcaps; |
| 595 | efi_capsule_header_t *capsules; |
| 596 | efi_status_t status; |
| 597 | u64 max_size; |
| 598 | int i, reset_type; |
| 599 | int rv = 0; |
| 600 | |
| 601 | qcaps_user = (struct efi_querycapsulecapabilities __user *)arg; |
| 602 | |
| 603 | if (copy_from_user(&qcaps, qcaps_user, sizeof(qcaps))) |
| 604 | return -EFAULT; |
| 605 | |
| 606 | capsules = kcalloc(qcaps.capsule_count + 1, |
| 607 | sizeof(efi_capsule_header_t), GFP_KERNEL); |
| 608 | if (!capsules) |
| 609 | return -ENOMEM; |
| 610 | |
| 611 | for (i = 0; i < qcaps.capsule_count; i++) { |
| 612 | efi_capsule_header_t *c; |
| 613 | /* |
| 614 | * We cannot dereference qcaps.capsule_header_array directly to |
| 615 | * obtain the address of the capsule as it resides in the |
| 616 | * user space |
| 617 | */ |
| 618 | if (get_user(c, qcaps.capsule_header_array + i)) { |
| 619 | rv = -EFAULT; |
| 620 | goto out; |
| 621 | } |
| 622 | if (copy_from_user(&capsules[i], c, |
| 623 | sizeof(efi_capsule_header_t))) { |
| 624 | rv = -EFAULT; |
| 625 | goto out; |
| 626 | } |
| 627 | } |
| 628 | |
| 629 | qcaps.capsule_header_array = &capsules; |
| 630 | |
| 631 | status = efi.query_capsule_caps((efi_capsule_header_t **) |
| 632 | qcaps.capsule_header_array, |
| 633 | qcaps.capsule_count, |
| 634 | &max_size, &reset_type); |
| 635 | |
| 636 | if (put_user(status, qcaps.status)) { |
| 637 | rv = -EFAULT; |
| 638 | goto out; |
| 639 | } |
| 640 | |
| 641 | if (status != EFI_SUCCESS) { |
| 642 | rv = -EINVAL; |
| 643 | goto out; |
| 644 | } |
| 645 | |
| 646 | if (put_user(max_size, qcaps.maximum_capsule_size)) { |
| 647 | rv = -EFAULT; |
| 648 | goto out; |
| 649 | } |
| 650 | |
| 651 | if (put_user(reset_type, qcaps.reset_type)) |
| 652 | rv = -EFAULT; |
| 653 | |
| 654 | out: |
| 655 | kfree(capsules); |
| 656 | return rv; |
| 657 | } |
| 658 | |
| 659 | static long efi_test_ioctl(struct file *file, unsigned int cmd, |
| 660 | unsigned long arg) |
| 661 | { |
| 662 | switch (cmd) { |
| 663 | case EFI_RUNTIME_GET_VARIABLE: |
| 664 | return efi_runtime_get_variable(arg); |
| 665 | |
| 666 | case EFI_RUNTIME_SET_VARIABLE: |
| 667 | return efi_runtime_set_variable(arg); |
| 668 | |
| 669 | case EFI_RUNTIME_GET_TIME: |
| 670 | return efi_runtime_get_time(arg); |
| 671 | |
| 672 | case EFI_RUNTIME_SET_TIME: |
| 673 | return efi_runtime_set_time(arg); |
| 674 | |
| 675 | case EFI_RUNTIME_GET_WAKETIME: |
| 676 | return efi_runtime_get_waketime(arg); |
| 677 | |
| 678 | case EFI_RUNTIME_SET_WAKETIME: |
| 679 | return efi_runtime_set_waketime(arg); |
| 680 | |
| 681 | case EFI_RUNTIME_GET_NEXTVARIABLENAME: |
| 682 | return efi_runtime_get_nextvariablename(arg); |
| 683 | |
| 684 | case EFI_RUNTIME_GET_NEXTHIGHMONOTONICCOUNT: |
| 685 | return efi_runtime_get_nexthighmonocount(arg); |
| 686 | |
| 687 | case EFI_RUNTIME_QUERY_VARIABLEINFO: |
| 688 | return efi_runtime_query_variableinfo(arg); |
| 689 | |
| 690 | case EFI_RUNTIME_QUERY_CAPSULECAPABILITIES: |
| 691 | return efi_runtime_query_capsulecaps(arg); |
| 692 | } |
| 693 | |
| 694 | return -ENOTTY; |
| 695 | } |
| 696 | |
| 697 | static int efi_test_open(struct inode *inode, struct file *file) |
| 698 | { |
| 699 | /* |
| 700 | * nothing special to do here |
| 701 | * We do accept multiple open files at the same time as we |
| 702 | * synchronize on the per call operation. |
| 703 | */ |
| 704 | return 0; |
| 705 | } |
| 706 | |
| 707 | static int efi_test_close(struct inode *inode, struct file *file) |
| 708 | { |
| 709 | return 0; |
| 710 | } |
| 711 | |
| 712 | /* |
| 713 | * The various file operations we support. |
| 714 | */ |
| 715 | static const struct file_operations efi_test_fops = { |
| 716 | .owner = THIS_MODULE, |
| 717 | .unlocked_ioctl = efi_test_ioctl, |
| 718 | .open = efi_test_open, |
| 719 | .release = efi_test_close, |
| 720 | .llseek = no_llseek, |
| 721 | }; |
| 722 | |
| 723 | static struct miscdevice efi_test_dev = { |
| 724 | MISC_DYNAMIC_MINOR, |
| 725 | "efi_test", |
| 726 | &efi_test_fops |
| 727 | }; |
| 728 | |
| 729 | static int __init efi_test_init(void) |
| 730 | { |
| 731 | int ret; |
| 732 | |
| 733 | ret = misc_register(&efi_test_dev); |
| 734 | if (ret) { |
| 735 | pr_err("efi_test: can't misc_register on minor=%d\n", |
| 736 | MISC_DYNAMIC_MINOR); |
| 737 | return ret; |
| 738 | } |
| 739 | |
| 740 | return 0; |
| 741 | } |
| 742 | |
| 743 | static void __exit efi_test_exit(void) |
| 744 | { |
| 745 | misc_deregister(&efi_test_dev); |
| 746 | } |
| 747 | |
| 748 | module_init(efi_test_init); |
| 749 | module_exit(efi_test_exit); |