1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Kexec bzImage loader 4 * 5 * Copyright (C) 2014 Red Hat Inc. 6 * Authors: 7 * Vivek Goyal <vgoyal@redhat.com> 8 */ 9 10 #define pr_fmt(fmt) "kexec-bzImage64: " fmt 11 12 #include <linux/string.h> 13 #include <linux/printk.h> 14 #include <linux/errno.h> 15 #include <linux/slab.h> 16 #include <linux/kexec.h> 17 #include <linux/kernel.h> 18 #include <linux/mm.h> 19 #include <linux/efi.h> 20 #include <linux/random.h> 21 22 #include <asm/bootparam.h> 23 #include <asm/setup.h> 24 #include <asm/crash.h> 25 #include <asm/efi.h> 26 #include <asm/e820/api.h> 27 #include <asm/kexec-bzimage64.h> 28 29 #define MAX_ELFCOREHDR_STR_LEN 30 /* elfcorehdr=0x<64bit-value> */ 30 #define MAX_DMCRYPTKEYS_STR_LEN 31 /* dmcryptkeys=0x<64bit-value> */ 31 32 33 /* 34 * Defines lowest physical address for various segments. Not sure where 35 * exactly these limits came from. Current bzimage64 loader in kexec-tools 36 * uses these so I am retaining it. It can be changed over time as we gain 37 * more insight. 38 */ 39 #define MIN_PURGATORY_ADDR 0x3000 40 #define MIN_BOOTPARAM_ADDR 0x3000 41 #define MIN_KERNEL_LOAD_ADDR 0x100000 42 #define MIN_INITRD_LOAD_ADDR 0x1000000 43 44 /* 45 * This is a place holder for all boot loader specific data structure which 46 * gets allocated in one call but gets freed much later during cleanup 47 * time. Right now there is only one field but it can grow as need be. 48 */ 49 struct bzimage64_data { 50 /* 51 * Temporary buffer to hold bootparams buffer. This should be 52 * freed once the bootparam segment has been loaded. 53 */ 54 void *bootparams_buf; 55 }; 56 57 static int setup_initrd(struct boot_params *params, 58 unsigned long initrd_load_addr, unsigned long initrd_len) 59 { 60 params->hdr.ramdisk_image = initrd_load_addr & 0xffffffffUL; 61 params->hdr.ramdisk_size = initrd_len & 0xffffffffUL; 62 63 params->ext_ramdisk_image = initrd_load_addr >> 32; 64 params->ext_ramdisk_size = initrd_len >> 32; 65 66 return 0; 67 } 68 69 static int setup_cmdline(struct kimage *image, struct boot_params *params, 70 unsigned long bootparams_load_addr, 71 unsigned long cmdline_offset, char *cmdline, 72 unsigned long cmdline_len) 73 { 74 char *cmdline_ptr = ((char *)params) + cmdline_offset; 75 unsigned long cmdline_ptr_phys, len = 0; 76 uint32_t cmdline_low_32, cmdline_ext_32; 77 78 if (image->type == KEXEC_TYPE_CRASH) { 79 len = sprintf(cmdline_ptr, 80 "elfcorehdr=0x%lx ", image->elf_load_addr); 81 82 if (image->dm_crypt_keys_addr != 0) 83 len += sprintf(cmdline_ptr + len, 84 "dmcryptkeys=0x%lx ", image->dm_crypt_keys_addr); 85 } 86 memcpy(cmdline_ptr + len, cmdline, cmdline_len); 87 cmdline_len += len; 88 89 cmdline_ptr[cmdline_len - 1] = '\0'; 90 91 kexec_dprintk("Final command line is: %s\n", cmdline_ptr); 92 cmdline_ptr_phys = bootparams_load_addr + cmdline_offset; 93 cmdline_low_32 = cmdline_ptr_phys & 0xffffffffUL; 94 cmdline_ext_32 = cmdline_ptr_phys >> 32; 95 96 params->hdr.cmd_line_ptr = cmdline_low_32; 97 if (cmdline_ext_32) 98 params->ext_cmd_line_ptr = cmdline_ext_32; 99 100 return 0; 101 } 102 103 static int setup_e820_entries(struct boot_params *params) 104 { 105 unsigned int nr_e820_entries; 106 107 nr_e820_entries = e820_table_kexec->nr_entries; 108 109 /* TODO: Pass entries more than E820_MAX_ENTRIES_ZEROPAGE in bootparams setup data */ 110 if (nr_e820_entries > E820_MAX_ENTRIES_ZEROPAGE) 111 nr_e820_entries = E820_MAX_ENTRIES_ZEROPAGE; 112 113 params->e820_entries = nr_e820_entries; 114 memcpy(¶ms->e820_table, &e820_table_kexec->entries, nr_e820_entries*sizeof(struct e820_entry)); 115 116 return 0; 117 } 118 119 enum { RNG_SEED_LENGTH = 32 }; 120 121 static void 122 setup_rng_seed(struct boot_params *params, unsigned long params_load_addr, 123 unsigned int rng_seed_setup_data_offset) 124 { 125 struct setup_data *sd = (void *)params + rng_seed_setup_data_offset; 126 unsigned long setup_data_phys; 127 128 if (!rng_is_initialized()) 129 return; 130 131 sd->type = SETUP_RNG_SEED; 132 sd->len = RNG_SEED_LENGTH; 133 get_random_bytes(sd->data, RNG_SEED_LENGTH); 134 setup_data_phys = params_load_addr + rng_seed_setup_data_offset; 135 sd->next = params->hdr.setup_data; 136 params->hdr.setup_data = setup_data_phys; 137 } 138 139 #ifdef CONFIG_EFI 140 static int setup_efi_info_memmap(struct boot_params *params, 141 unsigned long params_load_addr, 142 unsigned int efi_map_offset, 143 unsigned int efi_map_sz) 144 { 145 void *efi_map = (void *)params + efi_map_offset; 146 unsigned long efi_map_phys_addr = params_load_addr + efi_map_offset; 147 struct efi_info *ei = ¶ms->efi_info; 148 149 if (!efi_map_sz) 150 return 0; 151 152 efi_runtime_map_copy(efi_map, efi_map_sz); 153 154 ei->efi_memmap = efi_map_phys_addr & 0xffffffff; 155 ei->efi_memmap_hi = efi_map_phys_addr >> 32; 156 ei->efi_memmap_size = efi_map_sz; 157 158 return 0; 159 } 160 161 static int 162 prepare_add_efi_setup_data(struct boot_params *params, 163 unsigned long params_load_addr, 164 unsigned int efi_setup_data_offset) 165 { 166 unsigned long setup_data_phys; 167 struct setup_data *sd = (void *)params + efi_setup_data_offset; 168 struct efi_setup_data *esd = (void *)sd + sizeof(struct setup_data); 169 170 esd->fw_vendor = efi_fw_vendor; 171 esd->tables = efi_config_table; 172 esd->smbios = efi.smbios; 173 174 sd->type = SETUP_EFI; 175 sd->len = sizeof(struct efi_setup_data); 176 177 /* Add setup data */ 178 setup_data_phys = params_load_addr + efi_setup_data_offset; 179 sd->next = params->hdr.setup_data; 180 params->hdr.setup_data = setup_data_phys; 181 182 return 0; 183 } 184 185 static int 186 setup_efi_state(struct boot_params *params, unsigned long params_load_addr, 187 unsigned int efi_map_offset, unsigned int efi_map_sz, 188 unsigned int efi_setup_data_offset) 189 { 190 struct efi_info *current_ei = &boot_params.efi_info; 191 struct efi_info *ei = ¶ms->efi_info; 192 193 if (!efi_enabled(EFI_RUNTIME_SERVICES)) 194 return 0; 195 196 if (!current_ei->efi_memmap_size) 197 return 0; 198 199 params->secure_boot = boot_params.secure_boot; 200 ei->efi_loader_signature = current_ei->efi_loader_signature; 201 ei->efi_systab = current_ei->efi_systab; 202 ei->efi_systab_hi = current_ei->efi_systab_hi; 203 204 ei->efi_memdesc_version = current_ei->efi_memdesc_version; 205 ei->efi_memdesc_size = efi_get_runtime_map_desc_size(); 206 207 setup_efi_info_memmap(params, params_load_addr, efi_map_offset, 208 efi_map_sz); 209 prepare_add_efi_setup_data(params, params_load_addr, 210 efi_setup_data_offset); 211 return 0; 212 } 213 #endif /* CONFIG_EFI */ 214 215 static void 216 setup_ima_state(const struct kimage *image, struct boot_params *params, 217 unsigned long params_load_addr, 218 unsigned int ima_setup_data_offset) 219 { 220 #ifdef CONFIG_IMA_KEXEC 221 struct setup_data *sd = (void *)params + ima_setup_data_offset; 222 unsigned long setup_data_phys; 223 struct ima_setup_data *ima; 224 225 if (!image->ima_buffer_size) 226 return; 227 228 sd->type = SETUP_IMA; 229 sd->len = sizeof(*ima); 230 231 ima = (void *)sd + sizeof(struct setup_data); 232 ima->addr = image->ima_buffer_addr; 233 ima->size = image->ima_buffer_size; 234 235 /* Add setup data */ 236 setup_data_phys = params_load_addr + ima_setup_data_offset; 237 sd->next = params->hdr.setup_data; 238 params->hdr.setup_data = setup_data_phys; 239 #endif /* CONFIG_IMA_KEXEC */ 240 } 241 242 static void setup_kho(const struct kimage *image, struct boot_params *params, 243 unsigned long params_load_addr, 244 unsigned int setup_data_offset) 245 { 246 struct setup_data *sd = (void *)params + setup_data_offset; 247 struct kho_data *kho = (void *)sd + sizeof(*sd); 248 249 if (!IS_ENABLED(CONFIG_KEXEC_HANDOVER)) 250 return; 251 252 sd->type = SETUP_KEXEC_KHO; 253 sd->len = sizeof(struct kho_data); 254 255 /* Only add if we have all KHO images in place */ 256 if (!image->kho.fdt || !image->kho.scratch) 257 return; 258 259 /* Add setup data */ 260 kho->fdt_addr = image->kho.fdt; 261 kho->fdt_size = PAGE_SIZE; 262 kho->scratch_addr = image->kho.scratch->mem; 263 kho->scratch_size = image->kho.scratch->bufsz; 264 sd->next = params->hdr.setup_data; 265 params->hdr.setup_data = params_load_addr + setup_data_offset; 266 } 267 268 static int 269 setup_boot_parameters(struct kimage *image, struct boot_params *params, 270 unsigned long params_load_addr, 271 unsigned int efi_map_offset, unsigned int efi_map_sz, 272 unsigned int setup_data_offset) 273 { 274 unsigned int nr_e820_entries; 275 unsigned long long mem_k, start, end; 276 int i, ret = 0; 277 278 /* Get subarch from existing bootparams */ 279 params->hdr.hardware_subarch = boot_params.hdr.hardware_subarch; 280 281 /* Copying screen_info will do? */ 282 memcpy(¶ms->screen_info, &screen_info, sizeof(struct screen_info)); 283 284 /* Fill in memsize later */ 285 params->screen_info.ext_mem_k = 0; 286 params->alt_mem_k = 0; 287 288 /* Always fill in RSDP: it is either 0 or a valid value */ 289 params->acpi_rsdp_addr = boot_params.acpi_rsdp_addr; 290 291 /* Default APM info */ 292 memset(¶ms->apm_bios_info, 0, sizeof(params->apm_bios_info)); 293 294 /* Default drive info */ 295 memset(¶ms->hd0_info, 0, sizeof(params->hd0_info)); 296 memset(¶ms->hd1_info, 0, sizeof(params->hd1_info)); 297 298 #ifdef CONFIG_CRASH_DUMP 299 if (image->type == KEXEC_TYPE_CRASH) { 300 ret = crash_setup_memmap_entries(image, params); 301 if (ret) 302 return ret; 303 } else 304 #endif 305 setup_e820_entries(params); 306 307 nr_e820_entries = params->e820_entries; 308 309 kexec_dprintk("E820 memmap:\n"); 310 for (i = 0; i < nr_e820_entries; i++) { 311 kexec_dprintk("%016llx-%016llx (%d)\n", 312 params->e820_table[i].addr, 313 params->e820_table[i].addr + params->e820_table[i].size - 1, 314 params->e820_table[i].type); 315 if (params->e820_table[i].type != E820_TYPE_RAM) 316 continue; 317 start = params->e820_table[i].addr; 318 end = params->e820_table[i].addr + params->e820_table[i].size - 1; 319 320 if ((start <= 0x100000) && end > 0x100000) { 321 mem_k = (end >> 10) - (0x100000 >> 10); 322 params->screen_info.ext_mem_k = mem_k; 323 params->alt_mem_k = mem_k; 324 if (mem_k > 0xfc00) 325 params->screen_info.ext_mem_k = 0xfc00; /* 64M*/ 326 if (mem_k > 0xffffffff) 327 params->alt_mem_k = 0xffffffff; 328 } 329 } 330 331 #ifdef CONFIG_EFI 332 /* Setup EFI state */ 333 setup_efi_state(params, params_load_addr, efi_map_offset, efi_map_sz, 334 setup_data_offset); 335 setup_data_offset += sizeof(struct setup_data) + 336 sizeof(struct efi_setup_data); 337 #endif 338 339 if (IS_ENABLED(CONFIG_IMA_KEXEC)) { 340 /* Setup IMA log buffer state */ 341 setup_ima_state(image, params, params_load_addr, 342 setup_data_offset); 343 setup_data_offset += sizeof(struct setup_data) + 344 sizeof(struct ima_setup_data); 345 } 346 347 if (IS_ENABLED(CONFIG_KEXEC_HANDOVER)) { 348 /* Setup space to store preservation metadata */ 349 setup_kho(image, params, params_load_addr, setup_data_offset); 350 setup_data_offset += sizeof(struct setup_data) + 351 sizeof(struct kho_data); 352 } 353 354 /* Setup RNG seed */ 355 setup_rng_seed(params, params_load_addr, setup_data_offset); 356 357 /* Setup EDD info */ 358 memcpy(params->eddbuf, boot_params.eddbuf, 359 EDDMAXNR * sizeof(struct edd_info)); 360 params->eddbuf_entries = boot_params.eddbuf_entries; 361 362 memcpy(params->edd_mbr_sig_buffer, boot_params.edd_mbr_sig_buffer, 363 EDD_MBR_SIG_MAX * sizeof(unsigned int)); 364 365 return ret; 366 } 367 368 static int bzImage64_probe(const char *buf, unsigned long len) 369 { 370 int ret = -ENOEXEC; 371 struct setup_header *header; 372 373 /* kernel should be at least two sectors long */ 374 if (len < 2 * 512) { 375 pr_err("File is too short to be a bzImage\n"); 376 return ret; 377 } 378 379 header = (struct setup_header *)(buf + offsetof(struct boot_params, hdr)); 380 if (memcmp((char *)&header->header, "HdrS", 4) != 0) { 381 pr_err("Not a bzImage\n"); 382 return ret; 383 } 384 385 if (header->boot_flag != 0xAA55) { 386 pr_err("No x86 boot sector present\n"); 387 return ret; 388 } 389 390 if (header->version < 0x020C) { 391 pr_err("Must be at least protocol version 2.12\n"); 392 return ret; 393 } 394 395 if (!(header->loadflags & LOADED_HIGH)) { 396 pr_err("zImage not a bzImage\n"); 397 return ret; 398 } 399 400 if (!(header->xloadflags & XLF_KERNEL_64)) { 401 pr_err("Not a bzImage64. XLF_KERNEL_64 is not set.\n"); 402 return ret; 403 } 404 405 if (!(header->xloadflags & XLF_CAN_BE_LOADED_ABOVE_4G)) { 406 pr_err("XLF_CAN_BE_LOADED_ABOVE_4G is not set.\n"); 407 return ret; 408 } 409 410 /* 411 * Can't handle 32bit EFI as it does not allow loading kernel 412 * above 4G. This should be handled by 32bit bzImage loader 413 */ 414 if (efi_enabled(EFI_RUNTIME_SERVICES) && !efi_enabled(EFI_64BIT)) { 415 pr_debug("EFI is 32 bit. Can't load kernel above 4G.\n"); 416 return ret; 417 } 418 419 if (!(header->xloadflags & XLF_5LEVEL) && pgtable_l5_enabled()) { 420 pr_err("bzImage cannot handle 5-level paging mode.\n"); 421 return ret; 422 } 423 424 /* I've got a bzImage */ 425 pr_debug("It's a relocatable bzImage64\n"); 426 ret = 0; 427 428 return ret; 429 } 430 431 static void *bzImage64_load(struct kimage *image, char *kernel, 432 unsigned long kernel_len, char *initrd, 433 unsigned long initrd_len, char *cmdline, 434 unsigned long cmdline_len) 435 { 436 437 struct setup_header *header; 438 int setup_sects, kern16_size, ret = 0; 439 unsigned long setup_header_size, params_cmdline_sz; 440 struct boot_params *params; 441 unsigned long bootparam_load_addr, kernel_load_addr, initrd_load_addr; 442 struct bzimage64_data *ldata; 443 struct kexec_entry64_regs regs64; 444 void *stack; 445 unsigned int setup_hdr_offset = offsetof(struct boot_params, hdr); 446 unsigned int efi_map_offset, efi_map_sz, efi_setup_data_offset; 447 struct kexec_buf kbuf = { .image = image, .buf_max = ULONG_MAX, 448 .top_down = true }; 449 struct kexec_buf pbuf = { .image = image, .buf_min = MIN_PURGATORY_ADDR, 450 .buf_max = ULONG_MAX, .top_down = true }; 451 452 header = (struct setup_header *)(kernel + setup_hdr_offset); 453 setup_sects = header->setup_sects; 454 if (setup_sects == 0) 455 setup_sects = 4; 456 457 kern16_size = (setup_sects + 1) * 512; 458 if (kernel_len < kern16_size) { 459 pr_err("bzImage truncated\n"); 460 return ERR_PTR(-ENOEXEC); 461 } 462 463 if (cmdline_len > header->cmdline_size) { 464 pr_err("Kernel command line too long\n"); 465 return ERR_PTR(-EINVAL); 466 } 467 468 /* 469 * In case of crash dump, we will append elfcorehdr=<addr> to 470 * command line. Make sure it does not overflow 471 */ 472 if (cmdline_len + MAX_ELFCOREHDR_STR_LEN > header->cmdline_size) { 473 pr_err("Appending elfcorehdr=<addr> to command line exceeds maximum allowed length\n"); 474 return ERR_PTR(-EINVAL); 475 } 476 477 #ifdef CONFIG_CRASH_DUMP 478 /* Allocate and load backup region */ 479 if (image->type == KEXEC_TYPE_CRASH) { 480 ret = crash_load_segments(image); 481 if (ret) 482 return ERR_PTR(ret); 483 ret = crash_load_dm_crypt_keys(image); 484 if (ret == -ENOENT) { 485 kexec_dprintk("No dm crypt key to load\n"); 486 } else if (ret) { 487 pr_err("Failed to load dm crypt keys\n"); 488 return ERR_PTR(ret); 489 } 490 if (image->dm_crypt_keys_addr && 491 cmdline_len + MAX_ELFCOREHDR_STR_LEN + MAX_DMCRYPTKEYS_STR_LEN > 492 header->cmdline_size) { 493 pr_err("Appending dmcryptkeys=<addr> to command line exceeds maximum allowed length\n"); 494 return ERR_PTR(-EINVAL); 495 } 496 } 497 #endif 498 499 /* 500 * Load purgatory. For 64bit entry point, purgatory code can be 501 * anywhere. 502 */ 503 ret = kexec_load_purgatory(image, &pbuf); 504 if (ret) { 505 pr_err("Loading purgatory failed\n"); 506 return ERR_PTR(ret); 507 } 508 509 kexec_dprintk("Loaded purgatory at 0x%lx\n", pbuf.mem); 510 511 512 /* 513 * Load Bootparams and cmdline and space for efi stuff. 514 * 515 * Allocate memory together for multiple data structures so 516 * that they all can go in single area/segment and we don't 517 * have to create separate segment for each. Keeps things 518 * little bit simple 519 */ 520 efi_map_sz = efi_get_runtime_map_size(); 521 params_cmdline_sz = sizeof(struct boot_params) + cmdline_len + 522 MAX_ELFCOREHDR_STR_LEN; 523 if (image->dm_crypt_keys_addr) 524 params_cmdline_sz += MAX_DMCRYPTKEYS_STR_LEN; 525 params_cmdline_sz = ALIGN(params_cmdline_sz, 16); 526 kbuf.bufsz = params_cmdline_sz + ALIGN(efi_map_sz, 16) + 527 sizeof(struct setup_data) + 528 sizeof(struct efi_setup_data) + 529 sizeof(struct setup_data) + 530 RNG_SEED_LENGTH; 531 532 if (IS_ENABLED(CONFIG_IMA_KEXEC)) 533 kbuf.bufsz += sizeof(struct setup_data) + 534 sizeof(struct ima_setup_data); 535 536 if (IS_ENABLED(CONFIG_KEXEC_HANDOVER)) 537 kbuf.bufsz += sizeof(struct setup_data) + 538 sizeof(struct kho_data); 539 540 params = kzalloc(kbuf.bufsz, GFP_KERNEL); 541 if (!params) 542 return ERR_PTR(-ENOMEM); 543 efi_map_offset = params_cmdline_sz; 544 efi_setup_data_offset = efi_map_offset + ALIGN(efi_map_sz, 16); 545 546 /* Copy setup header onto bootparams. Documentation/arch/x86/boot.rst */ 547 setup_header_size = 0x0202 + kernel[0x0201] - setup_hdr_offset; 548 549 /* Is there a limit on setup header size? */ 550 memcpy(¶ms->hdr, (kernel + setup_hdr_offset), setup_header_size); 551 552 kbuf.buffer = params; 553 kbuf.memsz = kbuf.bufsz; 554 kbuf.buf_align = 16; 555 kbuf.buf_min = MIN_BOOTPARAM_ADDR; 556 ret = kexec_add_buffer(&kbuf); 557 if (ret) 558 goto out_free_params; 559 bootparam_load_addr = kbuf.mem; 560 kexec_dprintk("Loaded boot_param, command line and misc at 0x%lx bufsz=0x%lx memsz=0x%lx\n", 561 bootparam_load_addr, kbuf.bufsz, kbuf.memsz); 562 563 /* Load kernel */ 564 kbuf.buffer = kernel + kern16_size; 565 kbuf.bufsz = kernel_len - kern16_size; 566 kbuf.memsz = PAGE_ALIGN(header->init_size); 567 kbuf.buf_align = header->kernel_alignment; 568 if (header->pref_address < MIN_KERNEL_LOAD_ADDR) 569 kbuf.buf_min = MIN_KERNEL_LOAD_ADDR; 570 else 571 kbuf.buf_min = header->pref_address; 572 kbuf.mem = KEXEC_BUF_MEM_UNKNOWN; 573 ret = kexec_add_buffer(&kbuf); 574 if (ret) 575 goto out_free_params; 576 kernel_load_addr = kbuf.mem; 577 578 kexec_dprintk("Loaded 64bit kernel at 0x%lx bufsz=0x%lx memsz=0x%lx\n", 579 kernel_load_addr, kbuf.bufsz, kbuf.memsz); 580 581 /* Load initrd high */ 582 if (initrd) { 583 kbuf.buffer = initrd; 584 kbuf.bufsz = kbuf.memsz = initrd_len; 585 kbuf.buf_align = PAGE_SIZE; 586 kbuf.buf_min = MIN_INITRD_LOAD_ADDR; 587 kbuf.mem = KEXEC_BUF_MEM_UNKNOWN; 588 ret = kexec_add_buffer(&kbuf); 589 if (ret) 590 goto out_free_params; 591 initrd_load_addr = kbuf.mem; 592 593 kexec_dprintk("Loaded initrd at 0x%lx bufsz=0x%lx memsz=0x%lx\n", 594 initrd_load_addr, initrd_len, initrd_len); 595 596 setup_initrd(params, initrd_load_addr, initrd_len); 597 } 598 599 setup_cmdline(image, params, bootparam_load_addr, 600 sizeof(struct boot_params), cmdline, cmdline_len); 601 602 /* bootloader info. Do we need a separate ID for kexec kernel loader? */ 603 params->hdr.type_of_loader = 0x0D << 4; 604 params->hdr.loadflags = 0; 605 606 /* Setup purgatory regs for entry */ 607 ret = kexec_purgatory_get_set_symbol(image, "entry64_regs", ®s64, 608 sizeof(regs64), 1); 609 if (ret) 610 goto out_free_params; 611 612 regs64.rbx = 0; /* Bootstrap Processor */ 613 regs64.rsi = bootparam_load_addr; 614 regs64.rip = kernel_load_addr + 0x200; 615 stack = kexec_purgatory_get_symbol_addr(image, "stack_end"); 616 if (IS_ERR(stack)) { 617 pr_err("Could not find address of symbol stack_end\n"); 618 ret = -EINVAL; 619 goto out_free_params; 620 } 621 622 regs64.rsp = (unsigned long)stack; 623 ret = kexec_purgatory_get_set_symbol(image, "entry64_regs", ®s64, 624 sizeof(regs64), 0); 625 if (ret) 626 goto out_free_params; 627 628 ret = setup_boot_parameters(image, params, bootparam_load_addr, 629 efi_map_offset, efi_map_sz, 630 efi_setup_data_offset); 631 if (ret) 632 goto out_free_params; 633 634 /* Allocate loader specific data */ 635 ldata = kzalloc(sizeof(struct bzimage64_data), GFP_KERNEL); 636 if (!ldata) { 637 ret = -ENOMEM; 638 goto out_free_params; 639 } 640 641 /* 642 * Store pointer to params so that it could be freed after loading 643 * params segment has been loaded and contents have been copied 644 * somewhere else. 645 */ 646 ldata->bootparams_buf = params; 647 return ldata; 648 649 out_free_params: 650 kfree(params); 651 return ERR_PTR(ret); 652 } 653 654 /* This cleanup function is called after various segments have been loaded */ 655 static int bzImage64_cleanup(void *loader_data) 656 { 657 struct bzimage64_data *ldata = loader_data; 658 659 if (!ldata) 660 return 0; 661 662 kfree(ldata->bootparams_buf); 663 ldata->bootparams_buf = NULL; 664 665 return 0; 666 } 667 668 const struct kexec_file_ops kexec_bzImage64_ops = { 669 .probe = bzImage64_probe, 670 .load = bzImage64_load, 671 .cleanup = bzImage64_cleanup, 672 #ifdef CONFIG_KEXEC_BZIMAGE_VERIFY_SIG 673 .verify_sig = kexec_kernel_verify_pe_sig, 674 #endif 675 }; 676