Commit | Line | Data |
---|---|---|
40b0b3f8 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
a43cac0d DY |
2 | /* |
3 | * kexec: kexec_file_load system call | |
4 | * | |
5 | * Copyright (C) 2014 Red Hat Inc. | |
6 | * Authors: | |
7 | * Vivek Goyal <vgoyal@redhat.com> | |
a43cac0d DY |
8 | */ |
9 | ||
de90a6bc MH |
10 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
11 | ||
a43cac0d DY |
12 | #include <linux/capability.h> |
13 | #include <linux/mm.h> | |
14 | #include <linux/file.h> | |
15 | #include <linux/slab.h> | |
16 | #include <linux/kexec.h> | |
735c2f90 | 17 | #include <linux/memblock.h> |
a43cac0d DY |
18 | #include <linux/mutex.h> |
19 | #include <linux/list.h> | |
b804defe | 20 | #include <linux/fs.h> |
7b8589cc | 21 | #include <linux/ima.h> |
a43cac0d DY |
22 | #include <crypto/hash.h> |
23 | #include <crypto/sha.h> | |
babac4a8 AT |
24 | #include <linux/elf.h> |
25 | #include <linux/elfcore.h> | |
26 | #include <linux/kernel.h> | |
a43cac0d DY |
27 | #include <linux/syscalls.h> |
28 | #include <linux/vmalloc.h> | |
29 | #include "kexec_internal.h" | |
30 | ||
a43cac0d DY |
31 | static int kexec_calculate_store_digests(struct kimage *image); |
32 | ||
9ec4ecef AT |
33 | /* |
34 | * Currently this is the only default function that is exported as some | |
35 | * architectures need it to do additional handlings. | |
36 | * In the future, other default functions may be exported too if required. | |
37 | */ | |
38 | int kexec_image_probe_default(struct kimage *image, void *buf, | |
39 | unsigned long buf_len) | |
40 | { | |
41 | const struct kexec_file_ops * const *fops; | |
42 | int ret = -ENOEXEC; | |
43 | ||
44 | for (fops = &kexec_file_loaders[0]; *fops && (*fops)->probe; ++fops) { | |
45 | ret = (*fops)->probe(buf, buf_len); | |
46 | if (!ret) { | |
47 | image->fops = *fops; | |
48 | return ret; | |
49 | } | |
50 | } | |
51 | ||
52 | return ret; | |
53 | } | |
54 | ||
a43cac0d DY |
55 | /* Architectures can provide this probe function */ |
56 | int __weak arch_kexec_kernel_image_probe(struct kimage *image, void *buf, | |
57 | unsigned long buf_len) | |
58 | { | |
9ec4ecef AT |
59 | return kexec_image_probe_default(image, buf, buf_len); |
60 | } | |
61 | ||
62 | static void *kexec_image_load_default(struct kimage *image) | |
63 | { | |
64 | if (!image->fops || !image->fops->load) | |
65 | return ERR_PTR(-ENOEXEC); | |
66 | ||
67 | return image->fops->load(image, image->kernel_buf, | |
68 | image->kernel_buf_len, image->initrd_buf, | |
69 | image->initrd_buf_len, image->cmdline_buf, | |
70 | image->cmdline_buf_len); | |
a43cac0d DY |
71 | } |
72 | ||
73 | void * __weak arch_kexec_kernel_image_load(struct kimage *image) | |
74 | { | |
9ec4ecef AT |
75 | return kexec_image_load_default(image); |
76 | } | |
77 | ||
92a98a2b | 78 | int kexec_image_post_load_cleanup_default(struct kimage *image) |
9ec4ecef AT |
79 | { |
80 | if (!image->fops || !image->fops->cleanup) | |
81 | return 0; | |
82 | ||
83 | return image->fops->cleanup(image->image_loader_data); | |
a43cac0d DY |
84 | } |
85 | ||
86 | int __weak arch_kimage_file_post_load_cleanup(struct kimage *image) | |
87 | { | |
9ec4ecef | 88 | return kexec_image_post_load_cleanup_default(image); |
a43cac0d DY |
89 | } |
90 | ||
99d5cadf | 91 | #ifdef CONFIG_KEXEC_SIG |
9ec4ecef AT |
92 | static int kexec_image_verify_sig_default(struct kimage *image, void *buf, |
93 | unsigned long buf_len) | |
94 | { | |
95 | if (!image->fops || !image->fops->verify_sig) { | |
96 | pr_debug("kernel loader does not support signature verification.\n"); | |
97 | return -EKEYREJECTED; | |
98 | } | |
99 | ||
100 | return image->fops->verify_sig(buf, buf_len); | |
101 | } | |
102 | ||
a43cac0d DY |
103 | int __weak arch_kexec_kernel_verify_sig(struct kimage *image, void *buf, |
104 | unsigned long buf_len) | |
105 | { | |
9ec4ecef | 106 | return kexec_image_verify_sig_default(image, buf, buf_len); |
a43cac0d | 107 | } |
978e30c9 | 108 | #endif |
a43cac0d | 109 | |
8aec395b PR |
110 | /* |
111 | * arch_kexec_apply_relocations_add - apply relocations of type RELA | |
112 | * @pi: Purgatory to be relocated. | |
113 | * @section: Section relocations applying to. | |
114 | * @relsec: Section containing RELAs. | |
115 | * @symtab: Corresponding symtab. | |
116 | * | |
117 | * Return: 0 on success, negative errno on error. | |
118 | */ | |
a43cac0d | 119 | int __weak |
8aec395b PR |
120 | arch_kexec_apply_relocations_add(struct purgatory_info *pi, Elf_Shdr *section, |
121 | const Elf_Shdr *relsec, const Elf_Shdr *symtab) | |
a43cac0d DY |
122 | { |
123 | pr_err("RELA relocation unsupported.\n"); | |
124 | return -ENOEXEC; | |
125 | } | |
126 | ||
8aec395b PR |
127 | /* |
128 | * arch_kexec_apply_relocations - apply relocations of type REL | |
129 | * @pi: Purgatory to be relocated. | |
130 | * @section: Section relocations applying to. | |
131 | * @relsec: Section containing RELs. | |
132 | * @symtab: Corresponding symtab. | |
133 | * | |
134 | * Return: 0 on success, negative errno on error. | |
135 | */ | |
a43cac0d | 136 | int __weak |
8aec395b PR |
137 | arch_kexec_apply_relocations(struct purgatory_info *pi, Elf_Shdr *section, |
138 | const Elf_Shdr *relsec, const Elf_Shdr *symtab) | |
a43cac0d DY |
139 | { |
140 | pr_err("REL relocation unsupported.\n"); | |
141 | return -ENOEXEC; | |
142 | } | |
143 | ||
144 | /* | |
145 | * Free up memory used by kernel, initrd, and command line. This is temporary | |
146 | * memory allocation which is not needed any more after these buffers have | |
147 | * been loaded into separate segments and have been copied elsewhere. | |
148 | */ | |
149 | void kimage_file_post_load_cleanup(struct kimage *image) | |
150 | { | |
151 | struct purgatory_info *pi = &image->purgatory_info; | |
152 | ||
153 | vfree(image->kernel_buf); | |
154 | image->kernel_buf = NULL; | |
155 | ||
156 | vfree(image->initrd_buf); | |
157 | image->initrd_buf = NULL; | |
158 | ||
159 | kfree(image->cmdline_buf); | |
160 | image->cmdline_buf = NULL; | |
161 | ||
162 | vfree(pi->purgatory_buf); | |
163 | pi->purgatory_buf = NULL; | |
164 | ||
165 | vfree(pi->sechdrs); | |
166 | pi->sechdrs = NULL; | |
167 | ||
168 | /* See if architecture has anything to cleanup post load */ | |
169 | arch_kimage_file_post_load_cleanup(image); | |
170 | ||
171 | /* | |
172 | * Above call should have called into bootloader to free up | |
173 | * any data stored in kimage->image_loader_data. It should | |
174 | * be ok now to free it up. | |
175 | */ | |
176 | kfree(image->image_loader_data); | |
177 | image->image_loader_data = NULL; | |
178 | } | |
179 | ||
99d5cadf JB |
180 | #ifdef CONFIG_KEXEC_SIG |
181 | static int | |
182 | kimage_validate_signature(struct kimage *image) | |
183 | { | |
184 | const char *reason; | |
185 | int ret; | |
186 | ||
187 | ret = arch_kexec_kernel_verify_sig(image, image->kernel_buf, | |
188 | image->kernel_buf_len); | |
189 | switch (ret) { | |
190 | case 0: | |
191 | break; | |
192 | ||
193 | /* Certain verification errors are non-fatal if we're not | |
194 | * checking errors, provided we aren't mandating that there | |
195 | * must be a valid signature. | |
196 | */ | |
197 | case -ENODATA: | |
198 | reason = "kexec of unsigned image"; | |
199 | goto decide; | |
200 | case -ENOPKG: | |
201 | reason = "kexec of image with unsupported crypto"; | |
202 | goto decide; | |
203 | case -ENOKEY: | |
204 | reason = "kexec of image with unavailable key"; | |
205 | decide: | |
206 | if (IS_ENABLED(CONFIG_KEXEC_SIG_FORCE)) { | |
207 | pr_notice("%s rejected\n", reason); | |
208 | return ret; | |
209 | } | |
210 | ||
29d3c1c8 MG |
211 | /* If IMA is guaranteed to appraise a signature on the kexec |
212 | * image, permit it even if the kernel is otherwise locked | |
213 | * down. | |
214 | */ | |
215 | if (!ima_appraise_signature(READING_KEXEC_IMAGE) && | |
216 | security_locked_down(LOCKDOWN_KEXEC)) | |
217 | return -EPERM; | |
218 | ||
219 | return 0; | |
99d5cadf JB |
220 | |
221 | /* All other errors are fatal, including nomem, unparseable | |
222 | * signatures and signature check failures - even if signatures | |
223 | * aren't required. | |
224 | */ | |
225 | default: | |
226 | pr_notice("kernel signature verification failed (%d).\n", ret); | |
227 | } | |
228 | ||
229 | return ret; | |
230 | } | |
231 | #endif | |
232 | ||
a43cac0d DY |
233 | /* |
234 | * In file mode list of segments is prepared by kernel. Copy relevant | |
235 | * data from user space, do error checking, prepare segment list | |
236 | */ | |
237 | static int | |
238 | kimage_file_prepare_segments(struct kimage *image, int kernel_fd, int initrd_fd, | |
239 | const char __user *cmdline_ptr, | |
240 | unsigned long cmdline_len, unsigned flags) | |
241 | { | |
99d5cadf | 242 | int ret; |
a43cac0d | 243 | void *ldata; |
b804defe | 244 | loff_t size; |
a43cac0d | 245 | |
b804defe MZ |
246 | ret = kernel_read_file_from_fd(kernel_fd, &image->kernel_buf, |
247 | &size, INT_MAX, READING_KEXEC_IMAGE); | |
a43cac0d DY |
248 | if (ret) |
249 | return ret; | |
b804defe | 250 | image->kernel_buf_len = size; |
a43cac0d DY |
251 | |
252 | /* Call arch image probe handlers */ | |
253 | ret = arch_kexec_kernel_image_probe(image, image->kernel_buf, | |
254 | image->kernel_buf_len); | |
a43cac0d DY |
255 | if (ret) |
256 | goto out; | |
257 | ||
99d5cadf JB |
258 | #ifdef CONFIG_KEXEC_SIG |
259 | ret = kimage_validate_signature(image); | |
260 | ||
261 | if (ret) | |
a43cac0d | 262 | goto out; |
a43cac0d DY |
263 | #endif |
264 | /* It is possible that there no initramfs is being loaded */ | |
265 | if (!(flags & KEXEC_FILE_NO_INITRAMFS)) { | |
b804defe MZ |
266 | ret = kernel_read_file_from_fd(initrd_fd, &image->initrd_buf, |
267 | &size, INT_MAX, | |
268 | READING_KEXEC_INITRAMFS); | |
a43cac0d DY |
269 | if (ret) |
270 | goto out; | |
b804defe | 271 | image->initrd_buf_len = size; |
a43cac0d DY |
272 | } |
273 | ||
274 | if (cmdline_len) { | |
a9bd8dfa AV |
275 | image->cmdline_buf = memdup_user(cmdline_ptr, cmdline_len); |
276 | if (IS_ERR(image->cmdline_buf)) { | |
277 | ret = PTR_ERR(image->cmdline_buf); | |
278 | image->cmdline_buf = NULL; | |
a43cac0d DY |
279 | goto out; |
280 | } | |
281 | ||
282 | image->cmdline_buf_len = cmdline_len; | |
283 | ||
284 | /* command line should be a string with last byte null */ | |
285 | if (image->cmdline_buf[cmdline_len - 1] != '\0') { | |
286 | ret = -EINVAL; | |
287 | goto out; | |
288 | } | |
6a31fcd4 PS |
289 | |
290 | ima_kexec_cmdline(image->cmdline_buf, | |
291 | image->cmdline_buf_len - 1); | |
a43cac0d DY |
292 | } |
293 | ||
6a31fcd4 PS |
294 | /* IMA needs to pass the measurement list to the next kernel. */ |
295 | ima_add_kexec_buffer(image); | |
296 | ||
a43cac0d DY |
297 | /* Call arch image load handlers */ |
298 | ldata = arch_kexec_kernel_image_load(image); | |
299 | ||
300 | if (IS_ERR(ldata)) { | |
301 | ret = PTR_ERR(ldata); | |
302 | goto out; | |
303 | } | |
304 | ||
305 | image->image_loader_data = ldata; | |
306 | out: | |
307 | /* In case of error, free up all allocated memory in this function */ | |
308 | if (ret) | |
309 | kimage_file_post_load_cleanup(image); | |
310 | return ret; | |
311 | } | |
312 | ||
313 | static int | |
314 | kimage_file_alloc_init(struct kimage **rimage, int kernel_fd, | |
315 | int initrd_fd, const char __user *cmdline_ptr, | |
316 | unsigned long cmdline_len, unsigned long flags) | |
317 | { | |
318 | int ret; | |
319 | struct kimage *image; | |
320 | bool kexec_on_panic = flags & KEXEC_FILE_ON_CRASH; | |
321 | ||
322 | image = do_kimage_alloc_init(); | |
323 | if (!image) | |
324 | return -ENOMEM; | |
325 | ||
326 | image->file_mode = 1; | |
327 | ||
328 | if (kexec_on_panic) { | |
329 | /* Enable special crash kernel control page alloc policy. */ | |
330 | image->control_page = crashk_res.start; | |
331 | image->type = KEXEC_TYPE_CRASH; | |
332 | } | |
333 | ||
334 | ret = kimage_file_prepare_segments(image, kernel_fd, initrd_fd, | |
335 | cmdline_ptr, cmdline_len, flags); | |
336 | if (ret) | |
337 | goto out_free_image; | |
338 | ||
339 | ret = sanity_check_segment_list(image); | |
340 | if (ret) | |
341 | goto out_free_post_load_bufs; | |
342 | ||
343 | ret = -ENOMEM; | |
344 | image->control_code_page = kimage_alloc_control_pages(image, | |
345 | get_order(KEXEC_CONTROL_PAGE_SIZE)); | |
346 | if (!image->control_code_page) { | |
347 | pr_err("Could not allocate control_code_buffer\n"); | |
348 | goto out_free_post_load_bufs; | |
349 | } | |
350 | ||
351 | if (!kexec_on_panic) { | |
352 | image->swap_page = kimage_alloc_control_pages(image, 0); | |
353 | if (!image->swap_page) { | |
354 | pr_err("Could not allocate swap buffer\n"); | |
355 | goto out_free_control_pages; | |
356 | } | |
357 | } | |
358 | ||
359 | *rimage = image; | |
360 | return 0; | |
361 | out_free_control_pages: | |
362 | kimage_free_page_list(&image->control_pages); | |
363 | out_free_post_load_bufs: | |
364 | kimage_file_post_load_cleanup(image); | |
365 | out_free_image: | |
366 | kfree(image); | |
367 | return ret; | |
368 | } | |
369 | ||
370 | SYSCALL_DEFINE5(kexec_file_load, int, kernel_fd, int, initrd_fd, | |
371 | unsigned long, cmdline_len, const char __user *, cmdline_ptr, | |
372 | unsigned long, flags) | |
373 | { | |
374 | int ret = 0, i; | |
375 | struct kimage **dest_image, *image; | |
376 | ||
377 | /* We only trust the superuser with rebooting the system. */ | |
378 | if (!capable(CAP_SYS_BOOT) || kexec_load_disabled) | |
379 | return -EPERM; | |
380 | ||
381 | /* Make sure we have a legal set of flags */ | |
382 | if (flags != (flags & KEXEC_FILE_FLAGS)) | |
383 | return -EINVAL; | |
384 | ||
385 | image = NULL; | |
386 | ||
387 | if (!mutex_trylock(&kexec_mutex)) | |
388 | return -EBUSY; | |
389 | ||
390 | dest_image = &kexec_image; | |
9b492cf5 | 391 | if (flags & KEXEC_FILE_ON_CRASH) { |
a43cac0d | 392 | dest_image = &kexec_crash_image; |
9b492cf5 XP |
393 | if (kexec_crash_image) |
394 | arch_kexec_unprotect_crashkres(); | |
395 | } | |
a43cac0d DY |
396 | |
397 | if (flags & KEXEC_FILE_UNLOAD) | |
398 | goto exchange; | |
399 | ||
400 | /* | |
401 | * In case of crash, new kernel gets loaded in reserved region. It is | |
402 | * same memory where old crash kernel might be loaded. Free any | |
403 | * current crash dump kernel before we corrupt it. | |
404 | */ | |
405 | if (flags & KEXEC_FILE_ON_CRASH) | |
406 | kimage_free(xchg(&kexec_crash_image, NULL)); | |
407 | ||
408 | ret = kimage_file_alloc_init(&image, kernel_fd, initrd_fd, cmdline_ptr, | |
409 | cmdline_len, flags); | |
410 | if (ret) | |
411 | goto out; | |
412 | ||
413 | ret = machine_kexec_prepare(image); | |
414 | if (ret) | |
415 | goto out; | |
416 | ||
1229384f XP |
417 | /* |
418 | * Some architecture(like S390) may touch the crash memory before | |
419 | * machine_kexec_prepare(), we must copy vmcoreinfo data after it. | |
420 | */ | |
421 | ret = kimage_crash_copy_vmcoreinfo(image); | |
422 | if (ret) | |
423 | goto out; | |
424 | ||
a43cac0d DY |
425 | ret = kexec_calculate_store_digests(image); |
426 | if (ret) | |
427 | goto out; | |
428 | ||
429 | for (i = 0; i < image->nr_segments; i++) { | |
430 | struct kexec_segment *ksegment; | |
431 | ||
432 | ksegment = &image->segment[i]; | |
433 | pr_debug("Loading segment %d: buf=0x%p bufsz=0x%zx mem=0x%lx memsz=0x%zx\n", | |
434 | i, ksegment->buf, ksegment->bufsz, ksegment->mem, | |
435 | ksegment->memsz); | |
436 | ||
437 | ret = kimage_load_segment(image, &image->segment[i]); | |
438 | if (ret) | |
439 | goto out; | |
440 | } | |
441 | ||
442 | kimage_terminate(image); | |
443 | ||
444 | /* | |
445 | * Free up any temporary buffers allocated which are not needed | |
446 | * after image has been loaded | |
447 | */ | |
448 | kimage_file_post_load_cleanup(image); | |
449 | exchange: | |
450 | image = xchg(dest_image, image); | |
451 | out: | |
9b492cf5 XP |
452 | if ((flags & KEXEC_FILE_ON_CRASH) && kexec_crash_image) |
453 | arch_kexec_protect_crashkres(); | |
454 | ||
a43cac0d DY |
455 | mutex_unlock(&kexec_mutex); |
456 | kimage_free(image); | |
457 | return ret; | |
458 | } | |
459 | ||
460 | static int locate_mem_hole_top_down(unsigned long start, unsigned long end, | |
461 | struct kexec_buf *kbuf) | |
462 | { | |
463 | struct kimage *image = kbuf->image; | |
464 | unsigned long temp_start, temp_end; | |
465 | ||
466 | temp_end = min(end, kbuf->buf_max); | |
467 | temp_start = temp_end - kbuf->memsz; | |
468 | ||
469 | do { | |
470 | /* align down start */ | |
471 | temp_start = temp_start & (~(kbuf->buf_align - 1)); | |
472 | ||
473 | if (temp_start < start || temp_start < kbuf->buf_min) | |
474 | return 0; | |
475 | ||
476 | temp_end = temp_start + kbuf->memsz - 1; | |
477 | ||
478 | /* | |
479 | * Make sure this does not conflict with any of existing | |
480 | * segments | |
481 | */ | |
482 | if (kimage_is_destination_range(image, temp_start, temp_end)) { | |
483 | temp_start = temp_start - PAGE_SIZE; | |
484 | continue; | |
485 | } | |
486 | ||
487 | /* We found a suitable memory range */ | |
488 | break; | |
489 | } while (1); | |
490 | ||
491 | /* If we are here, we found a suitable memory range */ | |
492 | kbuf->mem = temp_start; | |
493 | ||
494 | /* Success, stop navigating through remaining System RAM ranges */ | |
495 | return 1; | |
496 | } | |
497 | ||
498 | static int locate_mem_hole_bottom_up(unsigned long start, unsigned long end, | |
499 | struct kexec_buf *kbuf) | |
500 | { | |
501 | struct kimage *image = kbuf->image; | |
502 | unsigned long temp_start, temp_end; | |
503 | ||
504 | temp_start = max(start, kbuf->buf_min); | |
505 | ||
506 | do { | |
507 | temp_start = ALIGN(temp_start, kbuf->buf_align); | |
508 | temp_end = temp_start + kbuf->memsz - 1; | |
509 | ||
510 | if (temp_end > end || temp_end > kbuf->buf_max) | |
511 | return 0; | |
512 | /* | |
513 | * Make sure this does not conflict with any of existing | |
514 | * segments | |
515 | */ | |
516 | if (kimage_is_destination_range(image, temp_start, temp_end)) { | |
517 | temp_start = temp_start + PAGE_SIZE; | |
518 | continue; | |
519 | } | |
520 | ||
521 | /* We found a suitable memory range */ | |
522 | break; | |
523 | } while (1); | |
524 | ||
525 | /* If we are here, we found a suitable memory range */ | |
526 | kbuf->mem = temp_start; | |
527 | ||
528 | /* Success, stop navigating through remaining System RAM ranges */ | |
529 | return 1; | |
530 | } | |
531 | ||
1d2e733b | 532 | static int locate_mem_hole_callback(struct resource *res, void *arg) |
a43cac0d DY |
533 | { |
534 | struct kexec_buf *kbuf = (struct kexec_buf *)arg; | |
1d2e733b | 535 | u64 start = res->start, end = res->end; |
a43cac0d DY |
536 | unsigned long sz = end - start + 1; |
537 | ||
538 | /* Returning 0 will take to next memory range */ | |
539 | if (sz < kbuf->memsz) | |
540 | return 0; | |
541 | ||
542 | if (end < kbuf->buf_min || start > kbuf->buf_max) | |
543 | return 0; | |
544 | ||
545 | /* | |
546 | * Allocate memory top down with-in ram range. Otherwise bottom up | |
547 | * allocation. | |
548 | */ | |
549 | if (kbuf->top_down) | |
550 | return locate_mem_hole_top_down(start, end, kbuf); | |
551 | return locate_mem_hole_bottom_up(start, end, kbuf); | |
552 | } | |
553 | ||
350e88ba | 554 | #ifdef CONFIG_ARCH_KEEP_MEMBLOCK |
735c2f90 AT |
555 | static int kexec_walk_memblock(struct kexec_buf *kbuf, |
556 | int (*func)(struct resource *, void *)) | |
557 | { | |
558 | int ret = 0; | |
559 | u64 i; | |
560 | phys_addr_t mstart, mend; | |
561 | struct resource res = { }; | |
562 | ||
497e1858 AT |
563 | if (kbuf->image->type == KEXEC_TYPE_CRASH) |
564 | return func(&crashk_res, kbuf); | |
565 | ||
735c2f90 | 566 | if (kbuf->top_down) { |
497e1858 | 567 | for_each_free_mem_range_reverse(i, NUMA_NO_NODE, MEMBLOCK_NONE, |
735c2f90 AT |
568 | &mstart, &mend, NULL) { |
569 | /* | |
570 | * In memblock, end points to the first byte after the | |
571 | * range while in kexec, end points to the last byte | |
572 | * in the range. | |
573 | */ | |
574 | res.start = mstart; | |
575 | res.end = mend - 1; | |
576 | ret = func(&res, kbuf); | |
577 | if (ret) | |
578 | break; | |
579 | } | |
580 | } else { | |
497e1858 AT |
581 | for_each_free_mem_range(i, NUMA_NO_NODE, MEMBLOCK_NONE, |
582 | &mstart, &mend, NULL) { | |
735c2f90 AT |
583 | /* |
584 | * In memblock, end points to the first byte after the | |
585 | * range while in kexec, end points to the last byte | |
586 | * in the range. | |
587 | */ | |
588 | res.start = mstart; | |
589 | res.end = mend - 1; | |
590 | ret = func(&res, kbuf); | |
591 | if (ret) | |
592 | break; | |
593 | } | |
594 | } | |
595 | ||
596 | return ret; | |
597 | } | |
350e88ba MR |
598 | #else |
599 | static int kexec_walk_memblock(struct kexec_buf *kbuf, | |
600 | int (*func)(struct resource *, void *)) | |
601 | { | |
602 | return 0; | |
603 | } | |
735c2f90 AT |
604 | #endif |
605 | ||
60fe3910 | 606 | /** |
735c2f90 | 607 | * kexec_walk_resources - call func(data) on free memory regions |
60fe3910 TJB |
608 | * @kbuf: Context info for the search. Also passed to @func. |
609 | * @func: Function to call for each memory region. | |
610 | * | |
611 | * Return: The memory walk will stop when func returns a non-zero value | |
612 | * and that value will be returned. If all free regions are visited without | |
613 | * func returning non-zero, then zero will be returned. | |
614 | */ | |
735c2f90 AT |
615 | static int kexec_walk_resources(struct kexec_buf *kbuf, |
616 | int (*func)(struct resource *, void *)) | |
60fe3910 TJB |
617 | { |
618 | if (kbuf->image->type == KEXEC_TYPE_CRASH) | |
619 | return walk_iomem_res_desc(crashk_res.desc, | |
620 | IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY, | |
621 | crashk_res.start, crashk_res.end, | |
622 | kbuf, func); | |
623 | else | |
624 | return walk_system_ram_res(0, ULONG_MAX, kbuf, func); | |
625 | } | |
626 | ||
e2e806f9 TJB |
627 | /** |
628 | * kexec_locate_mem_hole - find free memory for the purgatory or the next kernel | |
629 | * @kbuf: Parameters for the memory search. | |
630 | * | |
631 | * On success, kbuf->mem will have the start address of the memory region found. | |
632 | * | |
633 | * Return: 0 on success, negative errno on error. | |
634 | */ | |
635 | int kexec_locate_mem_hole(struct kexec_buf *kbuf) | |
636 | { | |
637 | int ret; | |
638 | ||
b6664ba4 AT |
639 | /* Arch knows where to place */ |
640 | if (kbuf->mem != KEXEC_BUF_MEM_UNKNOWN) | |
641 | return 0; | |
642 | ||
350e88ba | 643 | if (!IS_ENABLED(CONFIG_ARCH_KEEP_MEMBLOCK)) |
735c2f90 AT |
644 | ret = kexec_walk_resources(kbuf, locate_mem_hole_callback); |
645 | else | |
646 | ret = kexec_walk_memblock(kbuf, locate_mem_hole_callback); | |
e2e806f9 TJB |
647 | |
648 | return ret == 1 ? 0 : -EADDRNOTAVAIL; | |
649 | } | |
650 | ||
ec2b9bfa TJB |
651 | /** |
652 | * kexec_add_buffer - place a buffer in a kexec segment | |
653 | * @kbuf: Buffer contents and memory parameters. | |
654 | * | |
655 | * This function assumes that kexec_mutex is held. | |
656 | * On successful return, @kbuf->mem will have the physical address of | |
657 | * the buffer in memory. | |
658 | * | |
659 | * Return: 0 on success, negative errno on error. | |
a43cac0d | 660 | */ |
ec2b9bfa | 661 | int kexec_add_buffer(struct kexec_buf *kbuf) |
a43cac0d DY |
662 | { |
663 | ||
664 | struct kexec_segment *ksegment; | |
a43cac0d DY |
665 | int ret; |
666 | ||
667 | /* Currently adding segment this way is allowed only in file mode */ | |
ec2b9bfa | 668 | if (!kbuf->image->file_mode) |
a43cac0d DY |
669 | return -EINVAL; |
670 | ||
ec2b9bfa | 671 | if (kbuf->image->nr_segments >= KEXEC_SEGMENT_MAX) |
a43cac0d DY |
672 | return -EINVAL; |
673 | ||
674 | /* | |
675 | * Make sure we are not trying to add buffer after allocating | |
676 | * control pages. All segments need to be placed first before | |
677 | * any control pages are allocated. As control page allocation | |
678 | * logic goes through list of segments to make sure there are | |
679 | * no destination overlaps. | |
680 | */ | |
ec2b9bfa | 681 | if (!list_empty(&kbuf->image->control_pages)) { |
a43cac0d DY |
682 | WARN_ON(1); |
683 | return -EINVAL; | |
684 | } | |
685 | ||
ec2b9bfa TJB |
686 | /* Ensure minimum alignment needed for segments. */ |
687 | kbuf->memsz = ALIGN(kbuf->memsz, PAGE_SIZE); | |
688 | kbuf->buf_align = max(kbuf->buf_align, PAGE_SIZE); | |
a43cac0d DY |
689 | |
690 | /* Walk the RAM ranges and allocate a suitable range for the buffer */ | |
e2e806f9 TJB |
691 | ret = kexec_locate_mem_hole(kbuf); |
692 | if (ret) | |
693 | return ret; | |
a43cac0d DY |
694 | |
695 | /* Found a suitable memory range */ | |
ec2b9bfa | 696 | ksegment = &kbuf->image->segment[kbuf->image->nr_segments]; |
a43cac0d DY |
697 | ksegment->kbuf = kbuf->buffer; |
698 | ksegment->bufsz = kbuf->bufsz; | |
699 | ksegment->mem = kbuf->mem; | |
700 | ksegment->memsz = kbuf->memsz; | |
ec2b9bfa | 701 | kbuf->image->nr_segments++; |
a43cac0d DY |
702 | return 0; |
703 | } | |
704 | ||
705 | /* Calculate and store the digest of segments */ | |
706 | static int kexec_calculate_store_digests(struct kimage *image) | |
707 | { | |
708 | struct crypto_shash *tfm; | |
709 | struct shash_desc *desc; | |
710 | int ret = 0, i, j, zero_buf_sz, sha_region_sz; | |
711 | size_t desc_size, nullsz; | |
712 | char *digest; | |
713 | void *zero_buf; | |
714 | struct kexec_sha_region *sha_regions; | |
715 | struct purgatory_info *pi = &image->purgatory_info; | |
716 | ||
b799a09f AT |
717 | if (!IS_ENABLED(CONFIG_ARCH_HAS_KEXEC_PURGATORY)) |
718 | return 0; | |
719 | ||
a43cac0d DY |
720 | zero_buf = __va(page_to_pfn(ZERO_PAGE(0)) << PAGE_SHIFT); |
721 | zero_buf_sz = PAGE_SIZE; | |
722 | ||
723 | tfm = crypto_alloc_shash("sha256", 0, 0); | |
724 | if (IS_ERR(tfm)) { | |
725 | ret = PTR_ERR(tfm); | |
726 | goto out; | |
727 | } | |
728 | ||
729 | desc_size = crypto_shash_descsize(tfm) + sizeof(*desc); | |
730 | desc = kzalloc(desc_size, GFP_KERNEL); | |
731 | if (!desc) { | |
732 | ret = -ENOMEM; | |
733 | goto out_free_tfm; | |
734 | } | |
735 | ||
736 | sha_region_sz = KEXEC_SEGMENT_MAX * sizeof(struct kexec_sha_region); | |
737 | sha_regions = vzalloc(sha_region_sz); | |
738 | if (!sha_regions) | |
739 | goto out_free_desc; | |
740 | ||
741 | desc->tfm = tfm; | |
a43cac0d DY |
742 | |
743 | ret = crypto_shash_init(desc); | |
744 | if (ret < 0) | |
745 | goto out_free_sha_regions; | |
746 | ||
747 | digest = kzalloc(SHA256_DIGEST_SIZE, GFP_KERNEL); | |
748 | if (!digest) { | |
749 | ret = -ENOMEM; | |
750 | goto out_free_sha_regions; | |
751 | } | |
752 | ||
753 | for (j = i = 0; i < image->nr_segments; i++) { | |
754 | struct kexec_segment *ksegment; | |
755 | ||
756 | ksegment = &image->segment[i]; | |
757 | /* | |
758 | * Skip purgatory as it will be modified once we put digest | |
759 | * info in purgatory. | |
760 | */ | |
761 | if (ksegment->kbuf == pi->purgatory_buf) | |
762 | continue; | |
763 | ||
764 | ret = crypto_shash_update(desc, ksegment->kbuf, | |
765 | ksegment->bufsz); | |
766 | if (ret) | |
767 | break; | |
768 | ||
769 | /* | |
770 | * Assume rest of the buffer is filled with zero and | |
771 | * update digest accordingly. | |
772 | */ | |
773 | nullsz = ksegment->memsz - ksegment->bufsz; | |
774 | while (nullsz) { | |
775 | unsigned long bytes = nullsz; | |
776 | ||
777 | if (bytes > zero_buf_sz) | |
778 | bytes = zero_buf_sz; | |
779 | ret = crypto_shash_update(desc, zero_buf, bytes); | |
780 | if (ret) | |
781 | break; | |
782 | nullsz -= bytes; | |
783 | } | |
784 | ||
785 | if (ret) | |
786 | break; | |
787 | ||
788 | sha_regions[j].start = ksegment->mem; | |
789 | sha_regions[j].len = ksegment->memsz; | |
790 | j++; | |
791 | } | |
792 | ||
793 | if (!ret) { | |
794 | ret = crypto_shash_final(desc, digest); | |
795 | if (ret) | |
796 | goto out_free_digest; | |
40c50c1f TG |
797 | ret = kexec_purgatory_get_set_symbol(image, "purgatory_sha_regions", |
798 | sha_regions, sha_region_sz, 0); | |
a43cac0d DY |
799 | if (ret) |
800 | goto out_free_digest; | |
801 | ||
40c50c1f TG |
802 | ret = kexec_purgatory_get_set_symbol(image, "purgatory_sha256_digest", |
803 | digest, SHA256_DIGEST_SIZE, 0); | |
a43cac0d DY |
804 | if (ret) |
805 | goto out_free_digest; | |
806 | } | |
807 | ||
808 | out_free_digest: | |
809 | kfree(digest); | |
810 | out_free_sha_regions: | |
811 | vfree(sha_regions); | |
812 | out_free_desc: | |
813 | kfree(desc); | |
814 | out_free_tfm: | |
815 | kfree(tfm); | |
816 | out: | |
817 | return ret; | |
818 | } | |
819 | ||
b799a09f | 820 | #ifdef CONFIG_ARCH_HAS_KEXEC_PURGATORY |
93045705 PR |
821 | /* |
822 | * kexec_purgatory_setup_kbuf - prepare buffer to load purgatory. | |
823 | * @pi: Purgatory to be loaded. | |
824 | * @kbuf: Buffer to setup. | |
825 | * | |
826 | * Allocates the memory needed for the buffer. Caller is responsible to free | |
827 | * the memory after use. | |
828 | * | |
829 | * Return: 0 on success, negative errno on error. | |
830 | */ | |
831 | static int kexec_purgatory_setup_kbuf(struct purgatory_info *pi, | |
832 | struct kexec_buf *kbuf) | |
a43cac0d | 833 | { |
93045705 PR |
834 | const Elf_Shdr *sechdrs; |
835 | unsigned long bss_align; | |
836 | unsigned long bss_sz; | |
837 | unsigned long align; | |
838 | int i, ret; | |
a43cac0d | 839 | |
93045705 | 840 | sechdrs = (void *)pi->ehdr + pi->ehdr->e_shoff; |
3be3f61d PR |
841 | kbuf->buf_align = bss_align = 1; |
842 | kbuf->bufsz = bss_sz = 0; | |
93045705 PR |
843 | |
844 | for (i = 0; i < pi->ehdr->e_shnum; i++) { | |
845 | if (!(sechdrs[i].sh_flags & SHF_ALLOC)) | |
846 | continue; | |
847 | ||
848 | align = sechdrs[i].sh_addralign; | |
849 | if (sechdrs[i].sh_type != SHT_NOBITS) { | |
850 | if (kbuf->buf_align < align) | |
851 | kbuf->buf_align = align; | |
852 | kbuf->bufsz = ALIGN(kbuf->bufsz, align); | |
853 | kbuf->bufsz += sechdrs[i].sh_size; | |
854 | } else { | |
855 | if (bss_align < align) | |
856 | bss_align = align; | |
857 | bss_sz = ALIGN(bss_sz, align); | |
858 | bss_sz += sechdrs[i].sh_size; | |
859 | } | |
860 | } | |
861 | kbuf->bufsz = ALIGN(kbuf->bufsz, bss_align); | |
862 | kbuf->memsz = kbuf->bufsz + bss_sz; | |
863 | if (kbuf->buf_align < bss_align) | |
864 | kbuf->buf_align = bss_align; | |
865 | ||
866 | kbuf->buffer = vzalloc(kbuf->bufsz); | |
867 | if (!kbuf->buffer) | |
868 | return -ENOMEM; | |
869 | pi->purgatory_buf = kbuf->buffer; | |
870 | ||
871 | ret = kexec_add_buffer(kbuf); | |
872 | if (ret) | |
873 | goto out; | |
93045705 PR |
874 | |
875 | return 0; | |
876 | out: | |
877 | vfree(pi->purgatory_buf); | |
878 | pi->purgatory_buf = NULL; | |
879 | return ret; | |
880 | } | |
881 | ||
882 | /* | |
883 | * kexec_purgatory_setup_sechdrs - prepares the pi->sechdrs buffer. | |
884 | * @pi: Purgatory to be loaded. | |
885 | * @kbuf: Buffer prepared to store purgatory. | |
886 | * | |
887 | * Allocates the memory needed for the buffer. Caller is responsible to free | |
888 | * the memory after use. | |
889 | * | |
890 | * Return: 0 on success, negative errno on error. | |
891 | */ | |
892 | static int kexec_purgatory_setup_sechdrs(struct purgatory_info *pi, | |
893 | struct kexec_buf *kbuf) | |
894 | { | |
93045705 PR |
895 | unsigned long bss_addr; |
896 | unsigned long offset; | |
93045705 | 897 | Elf_Shdr *sechdrs; |
93045705 | 898 | int i; |
a43cac0d | 899 | |
8da0b724 PR |
900 | /* |
901 | * The section headers in kexec_purgatory are read-only. In order to | |
902 | * have them modifiable make a temporary copy. | |
903 | */ | |
fad953ce | 904 | sechdrs = vzalloc(array_size(sizeof(Elf_Shdr), pi->ehdr->e_shnum)); |
a43cac0d DY |
905 | if (!sechdrs) |
906 | return -ENOMEM; | |
93045705 PR |
907 | memcpy(sechdrs, (void *)pi->ehdr + pi->ehdr->e_shoff, |
908 | pi->ehdr->e_shnum * sizeof(Elf_Shdr)); | |
909 | pi->sechdrs = sechdrs; | |
a43cac0d | 910 | |
620f697c PR |
911 | offset = 0; |
912 | bss_addr = kbuf->mem + kbuf->bufsz; | |
f1b1cca3 | 913 | kbuf->image->start = pi->ehdr->e_entry; |
a43cac0d DY |
914 | |
915 | for (i = 0; i < pi->ehdr->e_shnum; i++) { | |
93045705 | 916 | unsigned long align; |
620f697c | 917 | void *src, *dst; |
93045705 | 918 | |
a43cac0d DY |
919 | if (!(sechdrs[i].sh_flags & SHF_ALLOC)) |
920 | continue; | |
921 | ||
922 | align = sechdrs[i].sh_addralign; | |
f1b1cca3 | 923 | if (sechdrs[i].sh_type == SHT_NOBITS) { |
a43cac0d DY |
924 | bss_addr = ALIGN(bss_addr, align); |
925 | sechdrs[i].sh_addr = bss_addr; | |
926 | bss_addr += sechdrs[i].sh_size; | |
f1b1cca3 PR |
927 | continue; |
928 | } | |
929 | ||
620f697c | 930 | offset = ALIGN(offset, align); |
f1b1cca3 PR |
931 | if (sechdrs[i].sh_flags & SHF_EXECINSTR && |
932 | pi->ehdr->e_entry >= sechdrs[i].sh_addr && | |
933 | pi->ehdr->e_entry < (sechdrs[i].sh_addr | |
934 | + sechdrs[i].sh_size)) { | |
935 | kbuf->image->start -= sechdrs[i].sh_addr; | |
620f697c | 936 | kbuf->image->start += kbuf->mem + offset; |
a43cac0d | 937 | } |
a43cac0d | 938 | |
8da0b724 | 939 | src = (void *)pi->ehdr + sechdrs[i].sh_offset; |
620f697c PR |
940 | dst = pi->purgatory_buf + offset; |
941 | memcpy(dst, src, sechdrs[i].sh_size); | |
942 | ||
943 | sechdrs[i].sh_addr = kbuf->mem + offset; | |
8da0b724 | 944 | sechdrs[i].sh_offset = offset; |
620f697c | 945 | offset += sechdrs[i].sh_size; |
f1b1cca3 | 946 | } |
a43cac0d | 947 | |
93045705 | 948 | return 0; |
a43cac0d DY |
949 | } |
950 | ||
951 | static int kexec_apply_relocations(struct kimage *image) | |
952 | { | |
953 | int i, ret; | |
954 | struct purgatory_info *pi = &image->purgatory_info; | |
8aec395b PR |
955 | const Elf_Shdr *sechdrs; |
956 | ||
957 | sechdrs = (void *)pi->ehdr + pi->ehdr->e_shoff; | |
a43cac0d | 958 | |
a43cac0d | 959 | for (i = 0; i < pi->ehdr->e_shnum; i++) { |
8aec395b PR |
960 | const Elf_Shdr *relsec; |
961 | const Elf_Shdr *symtab; | |
962 | Elf_Shdr *section; | |
963 | ||
964 | relsec = sechdrs + i; | |
a43cac0d | 965 | |
8aec395b PR |
966 | if (relsec->sh_type != SHT_RELA && |
967 | relsec->sh_type != SHT_REL) | |
a43cac0d DY |
968 | continue; |
969 | ||
970 | /* | |
971 | * For section of type SHT_RELA/SHT_REL, | |
972 | * ->sh_link contains section header index of associated | |
973 | * symbol table. And ->sh_info contains section header | |
974 | * index of section to which relocations apply. | |
975 | */ | |
8aec395b PR |
976 | if (relsec->sh_info >= pi->ehdr->e_shnum || |
977 | relsec->sh_link >= pi->ehdr->e_shnum) | |
a43cac0d DY |
978 | return -ENOEXEC; |
979 | ||
8aec395b PR |
980 | section = pi->sechdrs + relsec->sh_info; |
981 | symtab = sechdrs + relsec->sh_link; | |
a43cac0d DY |
982 | |
983 | if (!(section->sh_flags & SHF_ALLOC)) | |
984 | continue; | |
985 | ||
986 | /* | |
987 | * symtab->sh_link contain section header index of associated | |
988 | * string table. | |
989 | */ | |
990 | if (symtab->sh_link >= pi->ehdr->e_shnum) | |
991 | /* Invalid section number? */ | |
992 | continue; | |
993 | ||
994 | /* | |
995 | * Respective architecture needs to provide support for applying | |
996 | * relocations of type SHT_RELA/SHT_REL. | |
997 | */ | |
8aec395b PR |
998 | if (relsec->sh_type == SHT_RELA) |
999 | ret = arch_kexec_apply_relocations_add(pi, section, | |
1000 | relsec, symtab); | |
1001 | else if (relsec->sh_type == SHT_REL) | |
1002 | ret = arch_kexec_apply_relocations(pi, section, | |
1003 | relsec, symtab); | |
a43cac0d DY |
1004 | if (ret) |
1005 | return ret; | |
1006 | } | |
1007 | ||
1008 | return 0; | |
1009 | } | |
1010 | ||
3be3f61d PR |
1011 | /* |
1012 | * kexec_load_purgatory - Load and relocate the purgatory object. | |
1013 | * @image: Image to add the purgatory to. | |
1014 | * @kbuf: Memory parameters to use. | |
1015 | * | |
1016 | * Allocates the memory needed for image->purgatory_info.sechdrs and | |
1017 | * image->purgatory_info.purgatory_buf/kbuf->buffer. Caller is responsible | |
1018 | * to free the memory after use. | |
1019 | * | |
1020 | * Return: 0 on success, negative errno on error. | |
1021 | */ | |
1022 | int kexec_load_purgatory(struct kimage *image, struct kexec_buf *kbuf) | |
a43cac0d DY |
1023 | { |
1024 | struct purgatory_info *pi = &image->purgatory_info; | |
1025 | int ret; | |
1026 | ||
1027 | if (kexec_purgatory_size <= 0) | |
1028 | return -EINVAL; | |
1029 | ||
65c225d3 | 1030 | pi->ehdr = (const Elf_Ehdr *)kexec_purgatory; |
a43cac0d | 1031 | |
3be3f61d | 1032 | ret = kexec_purgatory_setup_kbuf(pi, kbuf); |
a43cac0d DY |
1033 | if (ret) |
1034 | return ret; | |
1035 | ||
3be3f61d | 1036 | ret = kexec_purgatory_setup_sechdrs(pi, kbuf); |
93045705 PR |
1037 | if (ret) |
1038 | goto out_free_kbuf; | |
1039 | ||
a43cac0d DY |
1040 | ret = kexec_apply_relocations(image); |
1041 | if (ret) | |
1042 | goto out; | |
1043 | ||
a43cac0d DY |
1044 | return 0; |
1045 | out: | |
1046 | vfree(pi->sechdrs); | |
070c43ee | 1047 | pi->sechdrs = NULL; |
93045705 | 1048 | out_free_kbuf: |
a43cac0d | 1049 | vfree(pi->purgatory_buf); |
070c43ee | 1050 | pi->purgatory_buf = NULL; |
a43cac0d DY |
1051 | return ret; |
1052 | } | |
1053 | ||
961d921a PR |
1054 | /* |
1055 | * kexec_purgatory_find_symbol - find a symbol in the purgatory | |
1056 | * @pi: Purgatory to search in. | |
1057 | * @name: Name of the symbol. | |
1058 | * | |
1059 | * Return: pointer to symbol in read-only symtab on success, NULL on error. | |
1060 | */ | |
1061 | static const Elf_Sym *kexec_purgatory_find_symbol(struct purgatory_info *pi, | |
1062 | const char *name) | |
a43cac0d | 1063 | { |
961d921a | 1064 | const Elf_Shdr *sechdrs; |
65c225d3 | 1065 | const Elf_Ehdr *ehdr; |
961d921a | 1066 | const Elf_Sym *syms; |
a43cac0d | 1067 | const char *strtab; |
961d921a | 1068 | int i, k; |
a43cac0d | 1069 | |
961d921a | 1070 | if (!pi->ehdr) |
a43cac0d DY |
1071 | return NULL; |
1072 | ||
a43cac0d | 1073 | ehdr = pi->ehdr; |
961d921a | 1074 | sechdrs = (void *)ehdr + ehdr->e_shoff; |
a43cac0d DY |
1075 | |
1076 | for (i = 0; i < ehdr->e_shnum; i++) { | |
1077 | if (sechdrs[i].sh_type != SHT_SYMTAB) | |
1078 | continue; | |
1079 | ||
1080 | if (sechdrs[i].sh_link >= ehdr->e_shnum) | |
1081 | /* Invalid strtab section number */ | |
1082 | continue; | |
961d921a PR |
1083 | strtab = (void *)ehdr + sechdrs[sechdrs[i].sh_link].sh_offset; |
1084 | syms = (void *)ehdr + sechdrs[i].sh_offset; | |
a43cac0d DY |
1085 | |
1086 | /* Go through symbols for a match */ | |
1087 | for (k = 0; k < sechdrs[i].sh_size/sizeof(Elf_Sym); k++) { | |
1088 | if (ELF_ST_BIND(syms[k].st_info) != STB_GLOBAL) | |
1089 | continue; | |
1090 | ||
1091 | if (strcmp(strtab + syms[k].st_name, name) != 0) | |
1092 | continue; | |
1093 | ||
1094 | if (syms[k].st_shndx == SHN_UNDEF || | |
1095 | syms[k].st_shndx >= ehdr->e_shnum) { | |
1096 | pr_debug("Symbol: %s has bad section index %d.\n", | |
1097 | name, syms[k].st_shndx); | |
1098 | return NULL; | |
1099 | } | |
1100 | ||
1101 | /* Found the symbol we are looking for */ | |
1102 | return &syms[k]; | |
1103 | } | |
1104 | } | |
1105 | ||
1106 | return NULL; | |
1107 | } | |
1108 | ||
1109 | void *kexec_purgatory_get_symbol_addr(struct kimage *image, const char *name) | |
1110 | { | |
1111 | struct purgatory_info *pi = &image->purgatory_info; | |
961d921a | 1112 | const Elf_Sym *sym; |
a43cac0d DY |
1113 | Elf_Shdr *sechdr; |
1114 | ||
1115 | sym = kexec_purgatory_find_symbol(pi, name); | |
1116 | if (!sym) | |
1117 | return ERR_PTR(-EINVAL); | |
1118 | ||
1119 | sechdr = &pi->sechdrs[sym->st_shndx]; | |
1120 | ||
1121 | /* | |
1122 | * Returns the address where symbol will finally be loaded after | |
1123 | * kexec_load_segment() | |
1124 | */ | |
1125 | return (void *)(sechdr->sh_addr + sym->st_value); | |
1126 | } | |
1127 | ||
1128 | /* | |
1129 | * Get or set value of a symbol. If "get_value" is true, symbol value is | |
1130 | * returned in buf otherwise symbol value is set based on value in buf. | |
1131 | */ | |
1132 | int kexec_purgatory_get_set_symbol(struct kimage *image, const char *name, | |
1133 | void *buf, unsigned int size, bool get_value) | |
1134 | { | |
a43cac0d | 1135 | struct purgatory_info *pi = &image->purgatory_info; |
961d921a PR |
1136 | const Elf_Sym *sym; |
1137 | Elf_Shdr *sec; | |
a43cac0d DY |
1138 | char *sym_buf; |
1139 | ||
1140 | sym = kexec_purgatory_find_symbol(pi, name); | |
1141 | if (!sym) | |
1142 | return -EINVAL; | |
1143 | ||
1144 | if (sym->st_size != size) { | |
1145 | pr_err("symbol %s size mismatch: expected %lu actual %u\n", | |
1146 | name, (unsigned long)sym->st_size, size); | |
1147 | return -EINVAL; | |
1148 | } | |
1149 | ||
961d921a | 1150 | sec = pi->sechdrs + sym->st_shndx; |
a43cac0d | 1151 | |
961d921a | 1152 | if (sec->sh_type == SHT_NOBITS) { |
a43cac0d DY |
1153 | pr_err("symbol %s is in a bss section. Cannot %s\n", name, |
1154 | get_value ? "get" : "set"); | |
1155 | return -EINVAL; | |
1156 | } | |
1157 | ||
8da0b724 | 1158 | sym_buf = (char *)pi->purgatory_buf + sec->sh_offset + sym->st_value; |
a43cac0d DY |
1159 | |
1160 | if (get_value) | |
1161 | memcpy((void *)buf, sym_buf, size); | |
1162 | else | |
1163 | memcpy((void *)sym_buf, buf, size); | |
1164 | ||
1165 | return 0; | |
1166 | } | |
b799a09f | 1167 | #endif /* CONFIG_ARCH_HAS_KEXEC_PURGATORY */ |
babac4a8 AT |
1168 | |
1169 | int crash_exclude_mem_range(struct crash_mem *mem, | |
1170 | unsigned long long mstart, unsigned long long mend) | |
1171 | { | |
1172 | int i, j; | |
1173 | unsigned long long start, end; | |
1174 | struct crash_mem_range temp_range = {0, 0}; | |
1175 | ||
1176 | for (i = 0; i < mem->nr_ranges; i++) { | |
1177 | start = mem->ranges[i].start; | |
1178 | end = mem->ranges[i].end; | |
1179 | ||
1180 | if (mstart > end || mend < start) | |
1181 | continue; | |
1182 | ||
1183 | /* Truncate any area outside of range */ | |
1184 | if (mstart < start) | |
1185 | mstart = start; | |
1186 | if (mend > end) | |
1187 | mend = end; | |
1188 | ||
1189 | /* Found completely overlapping range */ | |
1190 | if (mstart == start && mend == end) { | |
1191 | mem->ranges[i].start = 0; | |
1192 | mem->ranges[i].end = 0; | |
1193 | if (i < mem->nr_ranges - 1) { | |
1194 | /* Shift rest of the ranges to left */ | |
1195 | for (j = i; j < mem->nr_ranges - 1; j++) { | |
1196 | mem->ranges[j].start = | |
1197 | mem->ranges[j+1].start; | |
1198 | mem->ranges[j].end = | |
1199 | mem->ranges[j+1].end; | |
1200 | } | |
1201 | } | |
1202 | mem->nr_ranges--; | |
1203 | return 0; | |
1204 | } | |
1205 | ||
1206 | if (mstart > start && mend < end) { | |
1207 | /* Split original range */ | |
1208 | mem->ranges[i].end = mstart - 1; | |
1209 | temp_range.start = mend + 1; | |
1210 | temp_range.end = end; | |
1211 | } else if (mstart != start) | |
1212 | mem->ranges[i].end = mstart - 1; | |
1213 | else | |
1214 | mem->ranges[i].start = mend + 1; | |
1215 | break; | |
1216 | } | |
1217 | ||
1218 | /* If a split happened, add the split to array */ | |
1219 | if (!temp_range.end) | |
1220 | return 0; | |
1221 | ||
1222 | /* Split happened */ | |
1223 | if (i == mem->max_nr_ranges - 1) | |
1224 | return -ENOMEM; | |
1225 | ||
1226 | /* Location where new range should go */ | |
1227 | j = i + 1; | |
1228 | if (j < mem->nr_ranges) { | |
1229 | /* Move over all ranges one slot towards the end */ | |
1230 | for (i = mem->nr_ranges - 1; i >= j; i--) | |
1231 | mem->ranges[i + 1] = mem->ranges[i]; | |
1232 | } | |
1233 | ||
1234 | mem->ranges[j].start = temp_range.start; | |
1235 | mem->ranges[j].end = temp_range.end; | |
1236 | mem->nr_ranges++; | |
1237 | return 0; | |
1238 | } | |
1239 | ||
1240 | int crash_prepare_elf64_headers(struct crash_mem *mem, int kernel_map, | |
1241 | void **addr, unsigned long *sz) | |
1242 | { | |
1243 | Elf64_Ehdr *ehdr; | |
1244 | Elf64_Phdr *phdr; | |
1245 | unsigned long nr_cpus = num_possible_cpus(), nr_phdr, elf_sz; | |
1246 | unsigned char *buf; | |
1247 | unsigned int cpu, i; | |
1248 | unsigned long long notes_addr; | |
1249 | unsigned long mstart, mend; | |
1250 | ||
1251 | /* extra phdr for vmcoreinfo elf note */ | |
1252 | nr_phdr = nr_cpus + 1; | |
1253 | nr_phdr += mem->nr_ranges; | |
1254 | ||
1255 | /* | |
1256 | * kexec-tools creates an extra PT_LOAD phdr for kernel text mapping | |
1257 | * area (for example, ffffffff80000000 - ffffffffa0000000 on x86_64). | |
1258 | * I think this is required by tools like gdb. So same physical | |
1259 | * memory will be mapped in two elf headers. One will contain kernel | |
1260 | * text virtual addresses and other will have __va(physical) addresses. | |
1261 | */ | |
1262 | ||
1263 | nr_phdr++; | |
1264 | elf_sz = sizeof(Elf64_Ehdr) + nr_phdr * sizeof(Elf64_Phdr); | |
1265 | elf_sz = ALIGN(elf_sz, ELF_CORE_HEADER_ALIGN); | |
1266 | ||
1267 | buf = vzalloc(elf_sz); | |
1268 | if (!buf) | |
1269 | return -ENOMEM; | |
1270 | ||
1271 | ehdr = (Elf64_Ehdr *)buf; | |
1272 | phdr = (Elf64_Phdr *)(ehdr + 1); | |
1273 | memcpy(ehdr->e_ident, ELFMAG, SELFMAG); | |
1274 | ehdr->e_ident[EI_CLASS] = ELFCLASS64; | |
1275 | ehdr->e_ident[EI_DATA] = ELFDATA2LSB; | |
1276 | ehdr->e_ident[EI_VERSION] = EV_CURRENT; | |
1277 | ehdr->e_ident[EI_OSABI] = ELF_OSABI; | |
1278 | memset(ehdr->e_ident + EI_PAD, 0, EI_NIDENT - EI_PAD); | |
1279 | ehdr->e_type = ET_CORE; | |
1280 | ehdr->e_machine = ELF_ARCH; | |
1281 | ehdr->e_version = EV_CURRENT; | |
1282 | ehdr->e_phoff = sizeof(Elf64_Ehdr); | |
1283 | ehdr->e_ehsize = sizeof(Elf64_Ehdr); | |
1284 | ehdr->e_phentsize = sizeof(Elf64_Phdr); | |
1285 | ||
1286 | /* Prepare one phdr of type PT_NOTE for each present cpu */ | |
1287 | for_each_present_cpu(cpu) { | |
1288 | phdr->p_type = PT_NOTE; | |
1289 | notes_addr = per_cpu_ptr_to_phys(per_cpu_ptr(crash_notes, cpu)); | |
1290 | phdr->p_offset = phdr->p_paddr = notes_addr; | |
1291 | phdr->p_filesz = phdr->p_memsz = sizeof(note_buf_t); | |
1292 | (ehdr->e_phnum)++; | |
1293 | phdr++; | |
1294 | } | |
1295 | ||
1296 | /* Prepare one PT_NOTE header for vmcoreinfo */ | |
1297 | phdr->p_type = PT_NOTE; | |
1298 | phdr->p_offset = phdr->p_paddr = paddr_vmcoreinfo_note(); | |
1299 | phdr->p_filesz = phdr->p_memsz = VMCOREINFO_NOTE_SIZE; | |
1300 | (ehdr->e_phnum)++; | |
1301 | phdr++; | |
1302 | ||
1303 | /* Prepare PT_LOAD type program header for kernel text region */ | |
1304 | if (kernel_map) { | |
1305 | phdr->p_type = PT_LOAD; | |
1306 | phdr->p_flags = PF_R|PF_W|PF_X; | |
f973cce0 | 1307 | phdr->p_vaddr = (unsigned long) _text; |
babac4a8 AT |
1308 | phdr->p_filesz = phdr->p_memsz = _end - _text; |
1309 | phdr->p_offset = phdr->p_paddr = __pa_symbol(_text); | |
1310 | ehdr->e_phnum++; | |
1311 | phdr++; | |
1312 | } | |
1313 | ||
1314 | /* Go through all the ranges in mem->ranges[] and prepare phdr */ | |
1315 | for (i = 0; i < mem->nr_ranges; i++) { | |
1316 | mstart = mem->ranges[i].start; | |
1317 | mend = mem->ranges[i].end; | |
1318 | ||
1319 | phdr->p_type = PT_LOAD; | |
1320 | phdr->p_flags = PF_R|PF_W|PF_X; | |
1321 | phdr->p_offset = mstart; | |
1322 | ||
1323 | phdr->p_paddr = mstart; | |
f973cce0 | 1324 | phdr->p_vaddr = (unsigned long) __va(mstart); |
babac4a8 AT |
1325 | phdr->p_filesz = phdr->p_memsz = mend - mstart + 1; |
1326 | phdr->p_align = 0; | |
1327 | ehdr->e_phnum++; | |
1328 | phdr++; | |
1329 | pr_debug("Crash PT_LOAD elf header. phdr=%p vaddr=0x%llx, paddr=0x%llx, sz=0x%llx e_phnum=%d p_offset=0x%llx\n", | |
1330 | phdr, phdr->p_vaddr, phdr->p_paddr, phdr->p_filesz, | |
1331 | ehdr->e_phnum, phdr->p_offset); | |
1332 | } | |
1333 | ||
1334 | *addr = buf; | |
1335 | *sz = elf_sz; | |
1336 | return 0; | |
1337 | } |