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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/verification.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
30
31
32
33
34
35
36
37#define MIN_PURGATORY_ADDR 0x3000
38#define MIN_BOOTPARAM_ADDR 0x3000
39#define MIN_KERNEL_LOAD_ADDR 0x100000
40#define MIN_INITRD_LOAD_ADDR 0x1000000
41
42
43
44
45
46
47struct bzimage64_data {
48
49
50
51
52 void *bootparams_buf;
53};
54
55static int setup_initrd(struct boot_params *params,
56 unsigned long initrd_load_addr, unsigned long initrd_len)
57{
58 params->hdr.ramdisk_image = initrd_load_addr & 0xffffffffUL;
59 params->hdr.ramdisk_size = initrd_len & 0xffffffffUL;
60
61 params->ext_ramdisk_image = initrd_load_addr >> 32;
62 params->ext_ramdisk_size = initrd_len >> 32;
63
64 return 0;
65}
66
67static int setup_cmdline(struct kimage *image, struct boot_params *params,
68 unsigned long bootparams_load_addr,
69 unsigned long cmdline_offset, char *cmdline,
70 unsigned long cmdline_len)
71{
72 char *cmdline_ptr = ((char *)params) + cmdline_offset;
73 unsigned long cmdline_ptr_phys, len = 0;
74 uint32_t cmdline_low_32, cmdline_ext_32;
75
76 if (image->type == KEXEC_TYPE_CRASH) {
77 len = sprintf(cmdline_ptr,
78 "elfcorehdr=0x%lx ", image->arch.elf_load_addr);
79 }
80 memcpy(cmdline_ptr + len, cmdline, cmdline_len);
81 cmdline_len += len;
82
83 cmdline_ptr[cmdline_len - 1] = '\0';
84
85 pr_debug("Final command line is: %s\n", cmdline_ptr);
86 cmdline_ptr_phys = bootparams_load_addr + cmdline_offset;
87 cmdline_low_32 = cmdline_ptr_phys & 0xffffffffUL;
88 cmdline_ext_32 = cmdline_ptr_phys >> 32;
89
90 params->hdr.cmd_line_ptr = cmdline_low_32;
91 if (cmdline_ext_32)
92 params->ext_cmd_line_ptr = cmdline_ext_32;
93
94 return 0;
95}
96
97static int setup_e820_entries(struct boot_params *params)
98{
99 unsigned int nr_e820_entries;
100
101 nr_e820_entries = e820_table_kexec->nr_entries;
102
103
104 if (nr_e820_entries > E820_MAX_ENTRIES_ZEROPAGE)
105 nr_e820_entries = E820_MAX_ENTRIES_ZEROPAGE;
106
107 params->e820_entries = nr_e820_entries;
108 memcpy(¶ms->e820_table, &e820_table_kexec->entries, nr_e820_entries*sizeof(struct e820_entry));
109
110 return 0;
111}
112
113#ifdef CONFIG_EFI
114static int setup_efi_info_memmap(struct boot_params *params,
115 unsigned long params_load_addr,
116 unsigned int efi_map_offset,
117 unsigned int efi_map_sz)
118{
119 void *efi_map = (void *)params + efi_map_offset;
120 unsigned long efi_map_phys_addr = params_load_addr + efi_map_offset;
121 struct efi_info *ei = ¶ms->efi_info;
122
123 if (!efi_map_sz)
124 return 0;
125
126 efi_runtime_map_copy(efi_map, efi_map_sz);
127
128 ei->efi_memmap = efi_map_phys_addr & 0xffffffff;
129 ei->efi_memmap_hi = efi_map_phys_addr >> 32;
130 ei->efi_memmap_size = efi_map_sz;
131
132 return 0;
133}
134
135static int
136prepare_add_efi_setup_data(struct boot_params *params,
137 unsigned long params_load_addr,
138 unsigned int efi_setup_data_offset)
139{
140 unsigned long setup_data_phys;
141 struct setup_data *sd = (void *)params + efi_setup_data_offset;
142 struct efi_setup_data *esd = (void *)sd + sizeof(struct setup_data);
143
144 esd->fw_vendor = efi.fw_vendor;
145 esd->runtime = efi.runtime;
146 esd->tables = efi.config_table;
147 esd->smbios = efi.smbios;
148
149 sd->type = SETUP_EFI;
150 sd->len = sizeof(struct efi_setup_data);
151
152
153 setup_data_phys = params_load_addr + efi_setup_data_offset;
154 sd->next = params->hdr.setup_data;
155 params->hdr.setup_data = setup_data_phys;
156
157 return 0;
158}
159
160static int
161setup_efi_state(struct boot_params *params, unsigned long params_load_addr,
162 unsigned int efi_map_offset, unsigned int efi_map_sz,
163 unsigned int efi_setup_data_offset)
164{
165 struct efi_info *current_ei = &boot_params.efi_info;
166 struct efi_info *ei = ¶ms->efi_info;
167
168 if (!efi_enabled(EFI_RUNTIME_SERVICES))
169 return 0;
170
171 if (!current_ei->efi_memmap_size)
172 return 0;
173
174
175
176
177
178
179
180 if (efi_enabled(EFI_OLD_MEMMAP))
181 return 0;
182
183 ei->efi_loader_signature = current_ei->efi_loader_signature;
184 ei->efi_systab = current_ei->efi_systab;
185 ei->efi_systab_hi = current_ei->efi_systab_hi;
186
187 ei->efi_memdesc_version = current_ei->efi_memdesc_version;
188 ei->efi_memdesc_size = efi_get_runtime_map_desc_size();
189
190 setup_efi_info_memmap(params, params_load_addr, efi_map_offset,
191 efi_map_sz);
192 prepare_add_efi_setup_data(params, params_load_addr,
193 efi_setup_data_offset);
194 return 0;
195}
196#endif
197
198static int
199setup_boot_parameters(struct kimage *image, struct boot_params *params,
200 unsigned long params_load_addr,
201 unsigned int efi_map_offset, unsigned int efi_map_sz,
202 unsigned int efi_setup_data_offset)
203{
204 unsigned int nr_e820_entries;
205 unsigned long long mem_k, start, end;
206 int i, ret = 0;
207
208
209 params->hdr.hardware_subarch = boot_params.hdr.hardware_subarch;
210
211
212 memcpy(¶ms->screen_info, &boot_params.screen_info,
213 sizeof(struct screen_info));
214
215
216 params->screen_info.ext_mem_k = 0;
217 params->alt_mem_k = 0;
218
219
220 params->acpi_rsdp_addr = boot_params.acpi_rsdp_addr;
221
222
223 memset(¶ms->apm_bios_info, 0, sizeof(params->apm_bios_info));
224
225
226 memset(¶ms->hd0_info, 0, sizeof(params->hd0_info));
227 memset(¶ms->hd1_info, 0, sizeof(params->hd1_info));
228
229 if (image->type == KEXEC_TYPE_CRASH) {
230 ret = crash_setup_memmap_entries(image, params);
231 if (ret)
232 return ret;
233 } else
234 setup_e820_entries(params);
235
236 nr_e820_entries = params->e820_entries;
237
238 for (i = 0; i < nr_e820_entries; i++) {
239 if (params->e820_table[i].type != E820_TYPE_RAM)
240 continue;
241 start = params->e820_table[i].addr;
242 end = params->e820_table[i].addr + params->e820_table[i].size - 1;
243
244 if ((start <= 0x100000) && end > 0x100000) {
245 mem_k = (end >> 10) - (0x100000 >> 10);
246 params->screen_info.ext_mem_k = mem_k;
247 params->alt_mem_k = mem_k;
248 if (mem_k > 0xfc00)
249 params->screen_info.ext_mem_k = 0xfc00;
250 if (mem_k > 0xffffffff)
251 params->alt_mem_k = 0xffffffff;
252 }
253 }
254
255#ifdef CONFIG_EFI
256
257 setup_efi_state(params, params_load_addr, efi_map_offset, efi_map_sz,
258 efi_setup_data_offset);
259#endif
260
261 memcpy(params->eddbuf, boot_params.eddbuf,
262 EDDMAXNR * sizeof(struct edd_info));
263 params->eddbuf_entries = boot_params.eddbuf_entries;
264
265 memcpy(params->edd_mbr_sig_buffer, boot_params.edd_mbr_sig_buffer,
266 EDD_MBR_SIG_MAX * sizeof(unsigned int));
267
268 return ret;
269}
270
271static int bzImage64_probe(const char *buf, unsigned long len)
272{
273 int ret = -ENOEXEC;
274 struct setup_header *header;
275
276
277 if (len < 2 * 512) {
278 pr_err("File is too short to be a bzImage\n");
279 return ret;
280 }
281
282 header = (struct setup_header *)(buf + offsetof(struct boot_params, hdr));
283 if (memcmp((char *)&header->header, "HdrS", 4) != 0) {
284 pr_err("Not a bzImage\n");
285 return ret;
286 }
287
288 if (header->boot_flag != 0xAA55) {
289 pr_err("No x86 boot sector present\n");
290 return ret;
291 }
292
293 if (header->version < 0x020C) {
294 pr_err("Must be at least protocol version 2.12\n");
295 return ret;
296 }
297
298 if (!(header->loadflags & LOADED_HIGH)) {
299 pr_err("zImage not a bzImage\n");
300 return ret;
301 }
302
303 if (!(header->xloadflags & XLF_KERNEL_64)) {
304 pr_err("Not a bzImage64. XLF_KERNEL_64 is not set.\n");
305 return ret;
306 }
307
308 if (!(header->xloadflags & XLF_CAN_BE_LOADED_ABOVE_4G)) {
309 pr_err("XLF_CAN_BE_LOADED_ABOVE_4G is not set.\n");
310 return ret;
311 }
312
313
314
315
316
317 if (efi_enabled(EFI_RUNTIME_SERVICES) && !efi_enabled(EFI_64BIT)) {
318 pr_debug("EFI is 32 bit. Can't load kernel above 4G.\n");
319 return ret;
320 }
321
322 if (!(header->xloadflags & XLF_5LEVEL) && pgtable_l5_enabled()) {
323 pr_err("bzImage cannot handle 5-level paging mode.\n");
324 return ret;
325 }
326
327
328 pr_debug("It's a relocatable bzImage64\n");
329 ret = 0;
330
331 return ret;
332}
333
334static void *bzImage64_load(struct kimage *image, char *kernel,
335 unsigned long kernel_len, char *initrd,
336 unsigned long initrd_len, char *cmdline,
337 unsigned long cmdline_len)
338{
339
340 struct setup_header *header;
341 int setup_sects, kern16_size, ret = 0;
342 unsigned long setup_header_size, params_cmdline_sz;
343 struct boot_params *params;
344 unsigned long bootparam_load_addr, kernel_load_addr, initrd_load_addr;
345 struct bzimage64_data *ldata;
346 struct kexec_entry64_regs regs64;
347 void *stack;
348 unsigned int setup_hdr_offset = offsetof(struct boot_params, hdr);
349 unsigned int efi_map_offset, efi_map_sz, efi_setup_data_offset;
350 struct kexec_buf kbuf = { .image = image, .buf_max = ULONG_MAX,
351 .top_down = true };
352 struct kexec_buf pbuf = { .image = image, .buf_min = MIN_PURGATORY_ADDR,
353 .buf_max = ULONG_MAX, .top_down = true };
354
355 header = (struct setup_header *)(kernel + setup_hdr_offset);
356 setup_sects = header->setup_sects;
357 if (setup_sects == 0)
358 setup_sects = 4;
359
360 kern16_size = (setup_sects + 1) * 512;
361 if (kernel_len < kern16_size) {
362 pr_err("bzImage truncated\n");
363 return ERR_PTR(-ENOEXEC);
364 }
365
366 if (cmdline_len > header->cmdline_size) {
367 pr_err("Kernel command line too long\n");
368 return ERR_PTR(-EINVAL);
369 }
370
371
372
373
374
375 if (cmdline_len + MAX_ELFCOREHDR_STR_LEN > header->cmdline_size) {
376 pr_debug("Appending elfcorehdr=<addr> to command line exceeds maximum allowed length\n");
377 return ERR_PTR(-EINVAL);
378 }
379
380
381 if (image->type == KEXEC_TYPE_CRASH) {
382 ret = crash_load_segments(image);
383 if (ret)
384 return ERR_PTR(ret);
385 }
386
387
388
389
390
391 ret = kexec_load_purgatory(image, &pbuf);
392 if (ret) {
393 pr_err("Loading purgatory failed\n");
394 return ERR_PTR(ret);
395 }
396
397 pr_debug("Loaded purgatory at 0x%lx\n", pbuf.mem);
398
399
400
401
402
403
404
405
406
407
408 efi_map_sz = efi_get_runtime_map_size();
409 params_cmdline_sz = sizeof(struct boot_params) + cmdline_len +
410 MAX_ELFCOREHDR_STR_LEN;
411 params_cmdline_sz = ALIGN(params_cmdline_sz, 16);
412 kbuf.bufsz = params_cmdline_sz + ALIGN(efi_map_sz, 16) +
413 sizeof(struct setup_data) +
414 sizeof(struct efi_setup_data);
415
416 params = kzalloc(kbuf.bufsz, GFP_KERNEL);
417 if (!params)
418 return ERR_PTR(-ENOMEM);
419 efi_map_offset = params_cmdline_sz;
420 efi_setup_data_offset = efi_map_offset + ALIGN(efi_map_sz, 16);
421
422
423 setup_header_size = 0x0202 + kernel[0x0201] - setup_hdr_offset;
424
425
426 memcpy(¶ms->hdr, (kernel + setup_hdr_offset), setup_header_size);
427
428 kbuf.buffer = params;
429 kbuf.memsz = kbuf.bufsz;
430 kbuf.buf_align = 16;
431 kbuf.buf_min = MIN_BOOTPARAM_ADDR;
432 ret = kexec_add_buffer(&kbuf);
433 if (ret)
434 goto out_free_params;
435 bootparam_load_addr = kbuf.mem;
436 pr_debug("Loaded boot_param, command line and misc at 0x%lx bufsz=0x%lx memsz=0x%lx\n",
437 bootparam_load_addr, kbuf.bufsz, kbuf.bufsz);
438
439
440 kbuf.buffer = kernel + kern16_size;
441 kbuf.bufsz = kernel_len - kern16_size;
442 kbuf.memsz = PAGE_ALIGN(header->init_size);
443 kbuf.buf_align = header->kernel_alignment;
444 kbuf.buf_min = MIN_KERNEL_LOAD_ADDR;
445 kbuf.mem = KEXEC_BUF_MEM_UNKNOWN;
446 ret = kexec_add_buffer(&kbuf);
447 if (ret)
448 goto out_free_params;
449 kernel_load_addr = kbuf.mem;
450
451 pr_debug("Loaded 64bit kernel at 0x%lx bufsz=0x%lx memsz=0x%lx\n",
452 kernel_load_addr, kbuf.bufsz, kbuf.memsz);
453
454
455 if (initrd) {
456 kbuf.buffer = initrd;
457 kbuf.bufsz = kbuf.memsz = initrd_len;
458 kbuf.buf_align = PAGE_SIZE;
459 kbuf.buf_min = MIN_INITRD_LOAD_ADDR;
460 kbuf.mem = KEXEC_BUF_MEM_UNKNOWN;
461 ret = kexec_add_buffer(&kbuf);
462 if (ret)
463 goto out_free_params;
464 initrd_load_addr = kbuf.mem;
465
466 pr_debug("Loaded initrd at 0x%lx bufsz=0x%lx memsz=0x%lx\n",
467 initrd_load_addr, initrd_len, initrd_len);
468
469 setup_initrd(params, initrd_load_addr, initrd_len);
470 }
471
472 setup_cmdline(image, params, bootparam_load_addr,
473 sizeof(struct boot_params), cmdline, cmdline_len);
474
475
476 params->hdr.type_of_loader = 0x0D << 4;
477 params->hdr.loadflags = 0;
478
479
480 ret = kexec_purgatory_get_set_symbol(image, "entry64_regs", ®s64,
481 sizeof(regs64), 1);
482 if (ret)
483 goto out_free_params;
484
485 regs64.rbx = 0;
486 regs64.rsi = bootparam_load_addr;
487 regs64.rip = kernel_load_addr + 0x200;
488 stack = kexec_purgatory_get_symbol_addr(image, "stack_end");
489 if (IS_ERR(stack)) {
490 pr_err("Could not find address of symbol stack_end\n");
491 ret = -EINVAL;
492 goto out_free_params;
493 }
494
495 regs64.rsp = (unsigned long)stack;
496 ret = kexec_purgatory_get_set_symbol(image, "entry64_regs", ®s64,
497 sizeof(regs64), 0);
498 if (ret)
499 goto out_free_params;
500
501 ret = setup_boot_parameters(image, params, bootparam_load_addr,
502 efi_map_offset, efi_map_sz,
503 efi_setup_data_offset);
504 if (ret)
505 goto out_free_params;
506
507
508 ldata = kzalloc(sizeof(struct bzimage64_data), GFP_KERNEL);
509 if (!ldata) {
510 ret = -ENOMEM;
511 goto out_free_params;
512 }
513
514
515
516
517
518
519 ldata->bootparams_buf = params;
520 return ldata;
521
522out_free_params:
523 kfree(params);
524 return ERR_PTR(ret);
525}
526
527
528static int bzImage64_cleanup(void *loader_data)
529{
530 struct bzimage64_data *ldata = loader_data;
531
532 if (!ldata)
533 return 0;
534
535 kfree(ldata->bootparams_buf);
536 ldata->bootparams_buf = NULL;
537
538 return 0;
539}
540
541#ifdef CONFIG_KEXEC_BZIMAGE_VERIFY_SIG
542static int bzImage64_verify_sig(const char *kernel, unsigned long kernel_len)
543{
544 int ret;
545
546 ret = verify_pefile_signature(kernel, kernel_len,
547 VERIFY_USE_SECONDARY_KEYRING,
548 VERIFYING_KEXEC_PE_SIGNATURE);
549 if (ret == -ENOKEY && IS_ENABLED(CONFIG_INTEGRITY_PLATFORM_KEYRING)) {
550 ret = verify_pefile_signature(kernel, kernel_len,
551 VERIFY_USE_PLATFORM_KEYRING,
552 VERIFYING_KEXEC_PE_SIGNATURE);
553 }
554 return ret;
555}
556#endif
557
558const struct kexec_file_ops kexec_bzImage64_ops = {
559 .probe = bzImage64_probe,
560 .load = bzImage64_load,
561 .cleanup = bzImage64_cleanup,
562#ifdef CONFIG_KEXEC_BZIMAGE_VERIFY_SIG
563 .verify_sig = bzImage64_verify_sig,
564#endif
565};
566