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11
12#define pr_fmt(fmt) "kexec-bzImage64: " fmt
13
14#include <linux/string.h>
15#include <linux/printk.h>
16#include <linux/errno.h>
17#include <linux/slab.h>
18#include <linux/kexec.h>
19#include <linux/kernel.h>
20#include <linux/mm.h>
21#include <linux/efi.h>
22#include <linux/verification.h>
23
24#include <asm/bootparam.h>
25#include <asm/setup.h>
26#include <asm/crash.h>
27#include <asm/efi.h>
28#include <asm/e820/api.h>
29#include <asm/kexec-bzimage64.h>
30
31#define MAX_ELFCOREHDR_STR_LEN 30
32
33
34
35
36
37
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
46
47
48
49struct bzimage64_data {
50
51
52
53
54 void *bootparams_buf;
55};
56
57static 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
69static 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->arch.elf_load_addr);
81 }
82 memcpy(cmdline_ptr + len, cmdline, cmdline_len);
83 cmdline_len += len;
84
85 cmdline_ptr[cmdline_len - 1] = '\0';
86
87 pr_debug("Final command line is: %s\n", cmdline_ptr);
88 cmdline_ptr_phys = bootparams_load_addr + cmdline_offset;
89 cmdline_low_32 = cmdline_ptr_phys & 0xffffffffUL;
90 cmdline_ext_32 = cmdline_ptr_phys >> 32;
91
92 params->hdr.cmd_line_ptr = cmdline_low_32;
93 if (cmdline_ext_32)
94 params->ext_cmd_line_ptr = cmdline_ext_32;
95
96 return 0;
97}
98
99static int setup_e820_entries(struct boot_params *params)
100{
101 unsigned int nr_e820_entries;
102
103 nr_e820_entries = e820_table_kexec->nr_entries;
104
105
106 if (nr_e820_entries > E820_MAX_ENTRIES_ZEROPAGE)
107 nr_e820_entries = E820_MAX_ENTRIES_ZEROPAGE;
108
109 params->e820_entries = nr_e820_entries;
110 memcpy(¶ms->e820_table, &e820_table_kexec->entries, nr_e820_entries*sizeof(struct e820_entry));
111
112 return 0;
113}
114
115#ifdef CONFIG_EFI
116static int setup_efi_info_memmap(struct boot_params *params,
117 unsigned long params_load_addr,
118 unsigned int efi_map_offset,
119 unsigned int efi_map_sz)
120{
121 void *efi_map = (void *)params + efi_map_offset;
122 unsigned long efi_map_phys_addr = params_load_addr + efi_map_offset;
123 struct efi_info *ei = ¶ms->efi_info;
124
125 if (!efi_map_sz)
126 return 0;
127
128 efi_runtime_map_copy(efi_map, efi_map_sz);
129
130 ei->efi_memmap = efi_map_phys_addr & 0xffffffff;
131 ei->efi_memmap_hi = efi_map_phys_addr >> 32;
132 ei->efi_memmap_size = efi_map_sz;
133
134 return 0;
135}
136
137static int
138prepare_add_efi_setup_data(struct boot_params *params,
139 unsigned long params_load_addr,
140 unsigned int efi_setup_data_offset)
141{
142 unsigned long setup_data_phys;
143 struct setup_data *sd = (void *)params + efi_setup_data_offset;
144 struct efi_setup_data *esd = (void *)sd + sizeof(struct setup_data);
145
146 esd->fw_vendor = efi.fw_vendor;
147 esd->runtime = efi.runtime;
148 esd->tables = efi.config_table;
149 esd->smbios = efi.smbios;
150
151 sd->type = SETUP_EFI;
152 sd->len = sizeof(struct efi_setup_data);
153
154
155 setup_data_phys = params_load_addr + efi_setup_data_offset;
156 sd->next = params->hdr.setup_data;
157 params->hdr.setup_data = setup_data_phys;
158
159 return 0;
160}
161
162static int
163setup_efi_state(struct boot_params *params, unsigned long params_load_addr,
164 unsigned int efi_map_offset, unsigned int efi_map_sz,
165 unsigned int efi_setup_data_offset)
166{
167 struct efi_info *current_ei = &boot_params.efi_info;
168 struct efi_info *ei = ¶ms->efi_info;
169
170 if (!efi_enabled(EFI_RUNTIME_SERVICES))
171 return 0;
172
173 if (!current_ei->efi_memmap_size)
174 return 0;
175
176
177
178
179
180
181
182 if (efi_enabled(EFI_OLD_MEMMAP))
183 return 0;
184
185 ei->efi_loader_signature = current_ei->efi_loader_signature;
186 ei->efi_systab = current_ei->efi_systab;
187 ei->efi_systab_hi = current_ei->efi_systab_hi;
188
189 ei->efi_memdesc_version = current_ei->efi_memdesc_version;
190 ei->efi_memdesc_size = efi_get_runtime_map_desc_size();
191
192 setup_efi_info_memmap(params, params_load_addr, efi_map_offset,
193 efi_map_sz);
194 prepare_add_efi_setup_data(params, params_load_addr,
195 efi_setup_data_offset);
196 return 0;
197}
198#endif
199
200static int
201setup_boot_parameters(struct kimage *image, struct boot_params *params,
202 unsigned long params_load_addr,
203 unsigned int efi_map_offset, unsigned int efi_map_sz,
204 unsigned int efi_setup_data_offset)
205{
206 unsigned int nr_e820_entries;
207 unsigned long long mem_k, start, end;
208 int i, ret = 0;
209
210
211 params->hdr.hardware_subarch = boot_params.hdr.hardware_subarch;
212
213
214 memcpy(¶ms->screen_info, &boot_params.screen_info,
215 sizeof(struct screen_info));
216
217
218 params->screen_info.ext_mem_k = 0;
219 params->alt_mem_k = 0;
220
221
222 params->acpi_rsdp_addr = boot_params.acpi_rsdp_addr;
223
224
225 memset(¶ms->apm_bios_info, 0, sizeof(params->apm_bios_info));
226
227
228 memset(¶ms->hd0_info, 0, sizeof(params->hd0_info));
229 memset(¶ms->hd1_info, 0, sizeof(params->hd1_info));
230
231 if (image->type == KEXEC_TYPE_CRASH) {
232 ret = crash_setup_memmap_entries(image, params);
233 if (ret)
234 return ret;
235 } else
236 setup_e820_entries(params);
237
238 nr_e820_entries = params->e820_entries;
239
240 for (i = 0; i < nr_e820_entries; i++) {
241 if (params->e820_table[i].type != E820_TYPE_RAM)
242 continue;
243 start = params->e820_table[i].addr;
244 end = params->e820_table[i].addr + params->e820_table[i].size - 1;
245
246 if ((start <= 0x100000) && end > 0x100000) {
247 mem_k = (end >> 10) - (0x100000 >> 10);
248 params->screen_info.ext_mem_k = mem_k;
249 params->alt_mem_k = mem_k;
250 if (mem_k > 0xfc00)
251 params->screen_info.ext_mem_k = 0xfc00;
252 if (mem_k > 0xffffffff)
253 params->alt_mem_k = 0xffffffff;
254 }
255 }
256
257#ifdef CONFIG_EFI
258
259 setup_efi_state(params, params_load_addr, efi_map_offset, efi_map_sz,
260 efi_setup_data_offset);
261#endif
262
263 memcpy(params->eddbuf, boot_params.eddbuf,
264 EDDMAXNR * sizeof(struct edd_info));
265 params->eddbuf_entries = boot_params.eddbuf_entries;
266
267 memcpy(params->edd_mbr_sig_buffer, boot_params.edd_mbr_sig_buffer,
268 EDD_MBR_SIG_MAX * sizeof(unsigned int));
269
270 return ret;
271}
272
273static int bzImage64_probe(const char *buf, unsigned long len)
274{
275 int ret = -ENOEXEC;
276 struct setup_header *header;
277
278
279 if (len < 2 * 512) {
280 pr_err("File is too short to be a bzImage\n");
281 return ret;
282 }
283
284 header = (struct setup_header *)(buf + offsetof(struct boot_params, hdr));
285 if (memcmp((char *)&header->header, "HdrS", 4) != 0) {
286 pr_err("Not a bzImage\n");
287 return ret;
288 }
289
290 if (header->boot_flag != 0xAA55) {
291 pr_err("No x86 boot sector present\n");
292 return ret;
293 }
294
295 if (header->version < 0x020C) {
296 pr_err("Must be at least protocol version 2.12\n");
297 return ret;
298 }
299
300 if (!(header->loadflags & LOADED_HIGH)) {
301 pr_err("zImage not a bzImage\n");
302 return ret;
303 }
304
305 if (!(header->xloadflags & XLF_KERNEL_64)) {
306 pr_err("Not a bzImage64. XLF_KERNEL_64 is not set.\n");
307 return ret;
308 }
309
310 if (!(header->xloadflags & XLF_CAN_BE_LOADED_ABOVE_4G)) {
311 pr_err("XLF_CAN_BE_LOADED_ABOVE_4G is not set.\n");
312 return ret;
313 }
314
315
316
317
318
319 if (efi_enabled(EFI_RUNTIME_SERVICES) && !efi_enabled(EFI_64BIT)) {
320 pr_debug("EFI is 32 bit. Can't load kernel above 4G.\n");
321 return ret;
322 }
323
324
325 pr_debug("It's a relocatable bzImage64\n");
326 ret = 0;
327
328 return ret;
329}
330
331static void *bzImage64_load(struct kimage *image, char *kernel,
332 unsigned long kernel_len, char *initrd,
333 unsigned long initrd_len, char *cmdline,
334 unsigned long cmdline_len)
335{
336
337 struct setup_header *header;
338 int setup_sects, kern16_size, ret = 0;
339 unsigned long setup_header_size, params_cmdline_sz;
340 struct boot_params *params;
341 unsigned long bootparam_load_addr, kernel_load_addr, initrd_load_addr;
342 struct bzimage64_data *ldata;
343 struct kexec_entry64_regs regs64;
344 void *stack;
345 unsigned int setup_hdr_offset = offsetof(struct boot_params, hdr);
346 unsigned int efi_map_offset, efi_map_sz, efi_setup_data_offset;
347 struct kexec_buf kbuf = { .image = image, .buf_max = ULONG_MAX,
348 .top_down = true };
349 struct kexec_buf pbuf = { .image = image, .buf_min = MIN_PURGATORY_ADDR,
350 .buf_max = ULONG_MAX, .top_down = true };
351
352 header = (struct setup_header *)(kernel + setup_hdr_offset);
353 setup_sects = header->setup_sects;
354 if (setup_sects == 0)
355 setup_sects = 4;
356
357 kern16_size = (setup_sects + 1) * 512;
358 if (kernel_len < kern16_size) {
359 pr_err("bzImage truncated\n");
360 return ERR_PTR(-ENOEXEC);
361 }
362
363 if (cmdline_len > header->cmdline_size) {
364 pr_err("Kernel command line too long\n");
365 return ERR_PTR(-EINVAL);
366 }
367
368
369
370
371
372 if (cmdline_len + MAX_ELFCOREHDR_STR_LEN > header->cmdline_size) {
373 pr_debug("Appending elfcorehdr=<addr> to command line exceeds maximum allowed length\n");
374 return ERR_PTR(-EINVAL);
375 }
376
377
378 if (image->type == KEXEC_TYPE_CRASH) {
379 ret = crash_load_segments(image);
380 if (ret)
381 return ERR_PTR(ret);
382 }
383
384
385
386
387
388 ret = kexec_load_purgatory(image, &pbuf);
389 if (ret) {
390 pr_err("Loading purgatory failed\n");
391 return ERR_PTR(ret);
392 }
393
394 pr_debug("Loaded purgatory at 0x%lx\n", pbuf.mem);
395
396
397
398
399
400
401
402
403
404
405 efi_map_sz = efi_get_runtime_map_size();
406 params_cmdline_sz = sizeof(struct boot_params) + cmdline_len +
407 MAX_ELFCOREHDR_STR_LEN;
408 params_cmdline_sz = ALIGN(params_cmdline_sz, 16);
409 kbuf.bufsz = params_cmdline_sz + ALIGN(efi_map_sz, 16) +
410 sizeof(struct setup_data) +
411 sizeof(struct efi_setup_data);
412
413 params = kzalloc(kbuf.bufsz, GFP_KERNEL);
414 if (!params)
415 return ERR_PTR(-ENOMEM);
416 efi_map_offset = params_cmdline_sz;
417 efi_setup_data_offset = efi_map_offset + ALIGN(efi_map_sz, 16);
418
419
420 setup_header_size = 0x0202 + kernel[0x0201] - setup_hdr_offset;
421
422
423 memcpy(¶ms->hdr, (kernel + setup_hdr_offset), setup_header_size);
424
425 kbuf.buffer = params;
426 kbuf.memsz = kbuf.bufsz;
427 kbuf.buf_align = 16;
428 kbuf.buf_min = MIN_BOOTPARAM_ADDR;
429 ret = kexec_add_buffer(&kbuf);
430 if (ret)
431 goto out_free_params;
432 bootparam_load_addr = kbuf.mem;
433 pr_debug("Loaded boot_param, command line and misc at 0x%lx bufsz=0x%lx memsz=0x%lx\n",
434 bootparam_load_addr, kbuf.bufsz, kbuf.bufsz);
435
436
437 kbuf.buffer = kernel + kern16_size;
438 kbuf.bufsz = kernel_len - kern16_size;
439 kbuf.memsz = PAGE_ALIGN(header->init_size);
440 kbuf.buf_align = header->kernel_alignment;
441 kbuf.buf_min = MIN_KERNEL_LOAD_ADDR;
442 kbuf.mem = KEXEC_BUF_MEM_UNKNOWN;
443 ret = kexec_add_buffer(&kbuf);
444 if (ret)
445 goto out_free_params;
446 kernel_load_addr = kbuf.mem;
447
448 pr_debug("Loaded 64bit kernel at 0x%lx bufsz=0x%lx memsz=0x%lx\n",
449 kernel_load_addr, kbuf.bufsz, kbuf.memsz);
450
451
452 if (initrd) {
453 kbuf.buffer = initrd;
454 kbuf.bufsz = kbuf.memsz = initrd_len;
455 kbuf.buf_align = PAGE_SIZE;
456 kbuf.buf_min = MIN_INITRD_LOAD_ADDR;
457 kbuf.mem = KEXEC_BUF_MEM_UNKNOWN;
458 ret = kexec_add_buffer(&kbuf);
459 if (ret)
460 goto out_free_params;
461 initrd_load_addr = kbuf.mem;
462
463 pr_debug("Loaded initrd at 0x%lx bufsz=0x%lx memsz=0x%lx\n",
464 initrd_load_addr, initrd_len, initrd_len);
465
466 setup_initrd(params, initrd_load_addr, initrd_len);
467 }
468
469 setup_cmdline(image, params, bootparam_load_addr,
470 sizeof(struct boot_params), cmdline, cmdline_len);
471
472
473 params->hdr.type_of_loader = 0x0D << 4;
474 params->hdr.loadflags = 0;
475
476
477 ret = kexec_purgatory_get_set_symbol(image, "entry64_regs", ®s64,
478 sizeof(regs64), 1);
479 if (ret)
480 goto out_free_params;
481
482 regs64.rbx = 0;
483 regs64.rsi = bootparam_load_addr;
484 regs64.rip = kernel_load_addr + 0x200;
485 stack = kexec_purgatory_get_symbol_addr(image, "stack_end");
486 if (IS_ERR(stack)) {
487 pr_err("Could not find address of symbol stack_end\n");
488 ret = -EINVAL;
489 goto out_free_params;
490 }
491
492 regs64.rsp = (unsigned long)stack;
493 ret = kexec_purgatory_get_set_symbol(image, "entry64_regs", ®s64,
494 sizeof(regs64), 0);
495 if (ret)
496 goto out_free_params;
497
498 ret = setup_boot_parameters(image, params, bootparam_load_addr,
499 efi_map_offset, efi_map_sz,
500 efi_setup_data_offset);
501 if (ret)
502 goto out_free_params;
503
504
505 ldata = kzalloc(sizeof(struct bzimage64_data), GFP_KERNEL);
506 if (!ldata) {
507 ret = -ENOMEM;
508 goto out_free_params;
509 }
510
511
512
513
514
515
516 ldata->bootparams_buf = params;
517 return ldata;
518
519out_free_params:
520 kfree(params);
521 return ERR_PTR(ret);
522}
523
524
525static int bzImage64_cleanup(void *loader_data)
526{
527 struct bzimage64_data *ldata = loader_data;
528
529 if (!ldata)
530 return 0;
531
532 kfree(ldata->bootparams_buf);
533 ldata->bootparams_buf = NULL;
534
535 return 0;
536}
537
538#ifdef CONFIG_KEXEC_BZIMAGE_VERIFY_SIG
539static int bzImage64_verify_sig(const char *kernel, unsigned long kernel_len)
540{
541 int ret;
542
543 ret = verify_pefile_signature(kernel, kernel_len,
544 VERIFY_USE_SECONDARY_KEYRING,
545 VERIFYING_KEXEC_PE_SIGNATURE);
546 if (ret == -ENOKEY && IS_ENABLED(CONFIG_INTEGRITY_PLATFORM_KEYRING)) {
547 ret = verify_pefile_signature(kernel, kernel_len,
548 VERIFY_USE_PLATFORM_KEYRING,
549 VERIFYING_KEXEC_PE_SIGNATURE);
550 }
551 return ret;
552}
553#endif
554
555const struct kexec_file_ops kexec_bzImage64_ops = {
556 .probe = bzImage64_probe,
557 .load = bzImage64_load,
558 .cleanup = bzImage64_cleanup,
559#ifdef CONFIG_KEXEC_BZIMAGE_VERIFY_SIG
560 .verify_sig = bzImage64_verify_sig,
561#endif
562};
563