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 | 22 | #include <crypto/hash.h> |
a24d22b2 | 23 | #include <crypto/sha2.h> |
babac4a8 AT |
24 | #include <linux/elf.h> |
25 | #include <linux/elfcore.h> | |
26 | #include <linux/kernel.h> | |
b89999d0 | 27 | #include <linux/kernel_read_file.h> |
a43cac0d DY |
28 | #include <linux/syscalls.h> |
29 | #include <linux/vmalloc.h> | |
30 | #include "kexec_internal.h" | |
31 | ||
af16df54 CX |
32 | #ifdef CONFIG_KEXEC_SIG |
33 | static bool sig_enforce = IS_ENABLED(CONFIG_KEXEC_SIG_FORCE); | |
34 | ||
35 | void set_kexec_sig_enforced(void) | |
36 | { | |
37 | sig_enforce = true; | |
38 | } | |
39 | #endif | |
40 | ||
a43cac0d DY |
41 | static int kexec_calculate_store_digests(struct kimage *image); |
42 | ||
9ec4ecef AT |
43 | /* |
44 | * Currently this is the only default function that is exported as some | |
45 | * architectures need it to do additional handlings. | |
46 | * In the future, other default functions may be exported too if required. | |
47 | */ | |
48 | int kexec_image_probe_default(struct kimage *image, void *buf, | |
49 | unsigned long buf_len) | |
50 | { | |
51 | const struct kexec_file_ops * const *fops; | |
52 | int ret = -ENOEXEC; | |
53 | ||
54 | for (fops = &kexec_file_loaders[0]; *fops && (*fops)->probe; ++fops) { | |
55 | ret = (*fops)->probe(buf, buf_len); | |
56 | if (!ret) { | |
57 | image->fops = *fops; | |
58 | return ret; | |
59 | } | |
60 | } | |
61 | ||
62 | return ret; | |
63 | } | |
64 | ||
65d9a9a6 | 65 | void *kexec_image_load_default(struct kimage *image) |
9ec4ecef AT |
66 | { |
67 | if (!image->fops || !image->fops->load) | |
68 | return ERR_PTR(-ENOEXEC); | |
69 | ||
70 | return image->fops->load(image, image->kernel_buf, | |
71 | image->kernel_buf_len, image->initrd_buf, | |
72 | image->initrd_buf_len, image->cmdline_buf, | |
73 | image->cmdline_buf_len); | |
a43cac0d DY |
74 | } |
75 | ||
92a98a2b | 76 | int kexec_image_post_load_cleanup_default(struct kimage *image) |
9ec4ecef AT |
77 | { |
78 | if (!image->fops || !image->fops->cleanup) | |
79 | return 0; | |
80 | ||
81 | return image->fops->cleanup(image->image_loader_data); | |
a43cac0d DY |
82 | } |
83 | ||
99d5cadf | 84 | #ifdef CONFIG_KEXEC_SIG |
9ec4ecef AT |
85 | static int kexec_image_verify_sig_default(struct kimage *image, void *buf, |
86 | unsigned long buf_len) | |
87 | { | |
88 | if (!image->fops || !image->fops->verify_sig) { | |
89 | pr_debug("kernel loader does not support signature verification.\n"); | |
90 | return -EKEYREJECTED; | |
91 | } | |
92 | ||
93 | return image->fops->verify_sig(buf, buf_len); | |
94 | } | |
95 | ||
65d9a9a6 | 96 | int arch_kexec_kernel_verify_sig(struct kimage *image, void *buf, unsigned long buf_len) |
a43cac0d | 97 | { |
9ec4ecef | 98 | return kexec_image_verify_sig_default(image, buf, buf_len); |
a43cac0d | 99 | } |
978e30c9 | 100 | #endif |
a43cac0d | 101 | |
a43cac0d DY |
102 | /* |
103 | * Free up memory used by kernel, initrd, and command line. This is temporary | |
104 | * memory allocation which is not needed any more after these buffers have | |
105 | * been loaded into separate segments and have been copied elsewhere. | |
106 | */ | |
107 | void kimage_file_post_load_cleanup(struct kimage *image) | |
108 | { | |
109 | struct purgatory_info *pi = &image->purgatory_info; | |
110 | ||
111 | vfree(image->kernel_buf); | |
112 | image->kernel_buf = NULL; | |
113 | ||
114 | vfree(image->initrd_buf); | |
115 | image->initrd_buf = NULL; | |
116 | ||
117 | kfree(image->cmdline_buf); | |
118 | image->cmdline_buf = NULL; | |
119 | ||
120 | vfree(pi->purgatory_buf); | |
121 | pi->purgatory_buf = NULL; | |
122 | ||
123 | vfree(pi->sechdrs); | |
124 | pi->sechdrs = NULL; | |
125 | ||
f31e3386 LR |
126 | #ifdef CONFIG_IMA_KEXEC |
127 | vfree(image->ima_buffer); | |
128 | image->ima_buffer = NULL; | |
129 | #endif /* CONFIG_IMA_KEXEC */ | |
130 | ||
a43cac0d DY |
131 | /* See if architecture has anything to cleanup post load */ |
132 | arch_kimage_file_post_load_cleanup(image); | |
133 | ||
134 | /* | |
135 | * Above call should have called into bootloader to free up | |
136 | * any data stored in kimage->image_loader_data. It should | |
137 | * be ok now to free it up. | |
138 | */ | |
139 | kfree(image->image_loader_data); | |
140 | image->image_loader_data = NULL; | |
141 | } | |
142 | ||
99d5cadf JB |
143 | #ifdef CONFIG_KEXEC_SIG |
144 | static int | |
145 | kimage_validate_signature(struct kimage *image) | |
146 | { | |
99d5cadf JB |
147 | int ret; |
148 | ||
149 | ret = arch_kexec_kernel_verify_sig(image, image->kernel_buf, | |
150 | image->kernel_buf_len); | |
fd7af71b | 151 | if (ret) { |
99d5cadf | 152 | |
af16df54 | 153 | if (sig_enforce) { |
fd7af71b | 154 | pr_notice("Enforced kernel signature verification failed (%d).\n", ret); |
99d5cadf JB |
155 | return ret; |
156 | } | |
157 | ||
fd7af71b LJ |
158 | /* |
159 | * If IMA is guaranteed to appraise a signature on the kexec | |
29d3c1c8 MG |
160 | * image, permit it even if the kernel is otherwise locked |
161 | * down. | |
162 | */ | |
163 | if (!ima_appraise_signature(READING_KEXEC_IMAGE) && | |
164 | security_locked_down(LOCKDOWN_KEXEC)) | |
165 | return -EPERM; | |
166 | ||
fd7af71b | 167 | pr_debug("kernel signature verification failed (%d).\n", ret); |
99d5cadf JB |
168 | } |
169 | ||
fd7af71b | 170 | return 0; |
99d5cadf JB |
171 | } |
172 | #endif | |
173 | ||
a43cac0d DY |
174 | /* |
175 | * In file mode list of segments is prepared by kernel. Copy relevant | |
176 | * data from user space, do error checking, prepare segment list | |
177 | */ | |
178 | static int | |
179 | kimage_file_prepare_segments(struct kimage *image, int kernel_fd, int initrd_fd, | |
180 | const char __user *cmdline_ptr, | |
181 | unsigned long cmdline_len, unsigned flags) | |
182 | { | |
99d5cadf | 183 | int ret; |
a43cac0d DY |
184 | void *ldata; |
185 | ||
0fa8e084 | 186 | ret = kernel_read_file_from_fd(kernel_fd, 0, &image->kernel_buf, |
88535288 | 187 | INT_MAX, NULL, READING_KEXEC_IMAGE); |
f7a4f689 | 188 | if (ret < 0) |
a43cac0d | 189 | return ret; |
f7a4f689 | 190 | image->kernel_buf_len = ret; |
a43cac0d DY |
191 | |
192 | /* Call arch image probe handlers */ | |
193 | ret = arch_kexec_kernel_image_probe(image, image->kernel_buf, | |
194 | image->kernel_buf_len); | |
a43cac0d DY |
195 | if (ret) |
196 | goto out; | |
197 | ||
99d5cadf JB |
198 | #ifdef CONFIG_KEXEC_SIG |
199 | ret = kimage_validate_signature(image); | |
200 | ||
201 | if (ret) | |
a43cac0d | 202 | goto out; |
a43cac0d DY |
203 | #endif |
204 | /* It is possible that there no initramfs is being loaded */ | |
205 | if (!(flags & KEXEC_FILE_NO_INITRAMFS)) { | |
0fa8e084 | 206 | ret = kernel_read_file_from_fd(initrd_fd, 0, &image->initrd_buf, |
88535288 | 207 | INT_MAX, NULL, |
b804defe | 208 | READING_KEXEC_INITRAMFS); |
f7a4f689 | 209 | if (ret < 0) |
a43cac0d | 210 | goto out; |
f7a4f689 KC |
211 | image->initrd_buf_len = ret; |
212 | ret = 0; | |
a43cac0d DY |
213 | } |
214 | ||
215 | if (cmdline_len) { | |
a9bd8dfa AV |
216 | image->cmdline_buf = memdup_user(cmdline_ptr, cmdline_len); |
217 | if (IS_ERR(image->cmdline_buf)) { | |
218 | ret = PTR_ERR(image->cmdline_buf); | |
219 | image->cmdline_buf = NULL; | |
a43cac0d DY |
220 | goto out; |
221 | } | |
222 | ||
223 | image->cmdline_buf_len = cmdline_len; | |
224 | ||
225 | /* command line should be a string with last byte null */ | |
226 | if (image->cmdline_buf[cmdline_len - 1] != '\0') { | |
227 | ret = -EINVAL; | |
228 | goto out; | |
229 | } | |
6a31fcd4 | 230 | |
4834177e | 231 | ima_kexec_cmdline(kernel_fd, image->cmdline_buf, |
6a31fcd4 | 232 | image->cmdline_buf_len - 1); |
a43cac0d DY |
233 | } |
234 | ||
6a31fcd4 PS |
235 | /* IMA needs to pass the measurement list to the next kernel. */ |
236 | ima_add_kexec_buffer(image); | |
237 | ||
a43cac0d DY |
238 | /* Call arch image load handlers */ |
239 | ldata = arch_kexec_kernel_image_load(image); | |
240 | ||
241 | if (IS_ERR(ldata)) { | |
242 | ret = PTR_ERR(ldata); | |
243 | goto out; | |
244 | } | |
245 | ||
246 | image->image_loader_data = ldata; | |
247 | out: | |
248 | /* In case of error, free up all allocated memory in this function */ | |
249 | if (ret) | |
250 | kimage_file_post_load_cleanup(image); | |
251 | return ret; | |
252 | } | |
253 | ||
254 | static int | |
255 | kimage_file_alloc_init(struct kimage **rimage, int kernel_fd, | |
256 | int initrd_fd, const char __user *cmdline_ptr, | |
257 | unsigned long cmdline_len, unsigned long flags) | |
258 | { | |
259 | int ret; | |
260 | struct kimage *image; | |
261 | bool kexec_on_panic = flags & KEXEC_FILE_ON_CRASH; | |
262 | ||
263 | image = do_kimage_alloc_init(); | |
264 | if (!image) | |
265 | return -ENOMEM; | |
266 | ||
267 | image->file_mode = 1; | |
268 | ||
269 | if (kexec_on_panic) { | |
270 | /* Enable special crash kernel control page alloc policy. */ | |
271 | image->control_page = crashk_res.start; | |
272 | image->type = KEXEC_TYPE_CRASH; | |
273 | } | |
274 | ||
275 | ret = kimage_file_prepare_segments(image, kernel_fd, initrd_fd, | |
276 | cmdline_ptr, cmdline_len, flags); | |
277 | if (ret) | |
278 | goto out_free_image; | |
279 | ||
280 | ret = sanity_check_segment_list(image); | |
281 | if (ret) | |
282 | goto out_free_post_load_bufs; | |
283 | ||
284 | ret = -ENOMEM; | |
285 | image->control_code_page = kimage_alloc_control_pages(image, | |
286 | get_order(KEXEC_CONTROL_PAGE_SIZE)); | |
287 | if (!image->control_code_page) { | |
288 | pr_err("Could not allocate control_code_buffer\n"); | |
289 | goto out_free_post_load_bufs; | |
290 | } | |
291 | ||
292 | if (!kexec_on_panic) { | |
293 | image->swap_page = kimage_alloc_control_pages(image, 0); | |
294 | if (!image->swap_page) { | |
295 | pr_err("Could not allocate swap buffer\n"); | |
296 | goto out_free_control_pages; | |
297 | } | |
298 | } | |
299 | ||
300 | *rimage = image; | |
301 | return 0; | |
302 | out_free_control_pages: | |
303 | kimage_free_page_list(&image->control_pages); | |
304 | out_free_post_load_bufs: | |
305 | kimage_file_post_load_cleanup(image); | |
306 | out_free_image: | |
307 | kfree(image); | |
308 | return ret; | |
309 | } | |
310 | ||
311 | SYSCALL_DEFINE5(kexec_file_load, int, kernel_fd, int, initrd_fd, | |
312 | unsigned long, cmdline_len, const char __user *, cmdline_ptr, | |
313 | unsigned long, flags) | |
314 | { | |
315 | int ret = 0, i; | |
316 | struct kimage **dest_image, *image; | |
317 | ||
318 | /* We only trust the superuser with rebooting the system. */ | |
319 | if (!capable(CAP_SYS_BOOT) || kexec_load_disabled) | |
320 | return -EPERM; | |
321 | ||
322 | /* Make sure we have a legal set of flags */ | |
323 | if (flags != (flags & KEXEC_FILE_FLAGS)) | |
324 | return -EINVAL; | |
325 | ||
326 | image = NULL; | |
327 | ||
328 | if (!mutex_trylock(&kexec_mutex)) | |
329 | return -EBUSY; | |
330 | ||
331 | dest_image = &kexec_image; | |
9b492cf5 | 332 | if (flags & KEXEC_FILE_ON_CRASH) { |
a43cac0d | 333 | dest_image = &kexec_crash_image; |
9b492cf5 XP |
334 | if (kexec_crash_image) |
335 | arch_kexec_unprotect_crashkres(); | |
336 | } | |
a43cac0d DY |
337 | |
338 | if (flags & KEXEC_FILE_UNLOAD) | |
339 | goto exchange; | |
340 | ||
341 | /* | |
342 | * In case of crash, new kernel gets loaded in reserved region. It is | |
343 | * same memory where old crash kernel might be loaded. Free any | |
344 | * current crash dump kernel before we corrupt it. | |
345 | */ | |
346 | if (flags & KEXEC_FILE_ON_CRASH) | |
347 | kimage_free(xchg(&kexec_crash_image, NULL)); | |
348 | ||
349 | ret = kimage_file_alloc_init(&image, kernel_fd, initrd_fd, cmdline_ptr, | |
350 | cmdline_len, flags); | |
351 | if (ret) | |
352 | goto out; | |
353 | ||
354 | ret = machine_kexec_prepare(image); | |
355 | if (ret) | |
356 | goto out; | |
357 | ||
1229384f XP |
358 | /* |
359 | * Some architecture(like S390) may touch the crash memory before | |
360 | * machine_kexec_prepare(), we must copy vmcoreinfo data after it. | |
361 | */ | |
362 | ret = kimage_crash_copy_vmcoreinfo(image); | |
363 | if (ret) | |
364 | goto out; | |
365 | ||
a43cac0d DY |
366 | ret = kexec_calculate_store_digests(image); |
367 | if (ret) | |
368 | goto out; | |
369 | ||
370 | for (i = 0; i < image->nr_segments; i++) { | |
371 | struct kexec_segment *ksegment; | |
372 | ||
373 | ksegment = &image->segment[i]; | |
374 | pr_debug("Loading segment %d: buf=0x%p bufsz=0x%zx mem=0x%lx memsz=0x%zx\n", | |
375 | i, ksegment->buf, ksegment->bufsz, ksegment->mem, | |
376 | ksegment->memsz); | |
377 | ||
378 | ret = kimage_load_segment(image, &image->segment[i]); | |
379 | if (ret) | |
380 | goto out; | |
381 | } | |
382 | ||
383 | kimage_terminate(image); | |
384 | ||
de68e4da PT |
385 | ret = machine_kexec_post_load(image); |
386 | if (ret) | |
387 | goto out; | |
388 | ||
a43cac0d DY |
389 | /* |
390 | * Free up any temporary buffers allocated which are not needed | |
391 | * after image has been loaded | |
392 | */ | |
393 | kimage_file_post_load_cleanup(image); | |
394 | exchange: | |
395 | image = xchg(dest_image, image); | |
396 | out: | |
9b492cf5 XP |
397 | if ((flags & KEXEC_FILE_ON_CRASH) && kexec_crash_image) |
398 | arch_kexec_protect_crashkres(); | |
399 | ||
a43cac0d DY |
400 | mutex_unlock(&kexec_mutex); |
401 | kimage_free(image); | |
402 | return ret; | |
403 | } | |
404 | ||
405 | static int locate_mem_hole_top_down(unsigned long start, unsigned long end, | |
406 | struct kexec_buf *kbuf) | |
407 | { | |
408 | struct kimage *image = kbuf->image; | |
409 | unsigned long temp_start, temp_end; | |
410 | ||
411 | temp_end = min(end, kbuf->buf_max); | |
412 | temp_start = temp_end - kbuf->memsz; | |
413 | ||
414 | do { | |
415 | /* align down start */ | |
416 | temp_start = temp_start & (~(kbuf->buf_align - 1)); | |
417 | ||
418 | if (temp_start < start || temp_start < kbuf->buf_min) | |
419 | return 0; | |
420 | ||
421 | temp_end = temp_start + kbuf->memsz - 1; | |
422 | ||
423 | /* | |
424 | * Make sure this does not conflict with any of existing | |
425 | * segments | |
426 | */ | |
427 | if (kimage_is_destination_range(image, temp_start, temp_end)) { | |
428 | temp_start = temp_start - PAGE_SIZE; | |
429 | continue; | |
430 | } | |
431 | ||
432 | /* We found a suitable memory range */ | |
433 | break; | |
434 | } while (1); | |
435 | ||
436 | /* If we are here, we found a suitable memory range */ | |
437 | kbuf->mem = temp_start; | |
438 | ||
439 | /* Success, stop navigating through remaining System RAM ranges */ | |
440 | return 1; | |
441 | } | |
442 | ||
443 | static int locate_mem_hole_bottom_up(unsigned long start, unsigned long end, | |
444 | struct kexec_buf *kbuf) | |
445 | { | |
446 | struct kimage *image = kbuf->image; | |
447 | unsigned long temp_start, temp_end; | |
448 | ||
449 | temp_start = max(start, kbuf->buf_min); | |
450 | ||
451 | do { | |
452 | temp_start = ALIGN(temp_start, kbuf->buf_align); | |
453 | temp_end = temp_start + kbuf->memsz - 1; | |
454 | ||
455 | if (temp_end > end || temp_end > kbuf->buf_max) | |
456 | return 0; | |
457 | /* | |
458 | * Make sure this does not conflict with any of existing | |
459 | * segments | |
460 | */ | |
461 | if (kimage_is_destination_range(image, temp_start, temp_end)) { | |
462 | temp_start = temp_start + PAGE_SIZE; | |
463 | continue; | |
464 | } | |
465 | ||
466 | /* We found a suitable memory range */ | |
467 | break; | |
468 | } while (1); | |
469 | ||
470 | /* If we are here, we found a suitable memory range */ | |
471 | kbuf->mem = temp_start; | |
472 | ||
473 | /* Success, stop navigating through remaining System RAM ranges */ | |
474 | return 1; | |
475 | } | |
476 | ||
1d2e733b | 477 | static int locate_mem_hole_callback(struct resource *res, void *arg) |
a43cac0d DY |
478 | { |
479 | struct kexec_buf *kbuf = (struct kexec_buf *)arg; | |
1d2e733b | 480 | u64 start = res->start, end = res->end; |
a43cac0d DY |
481 | unsigned long sz = end - start + 1; |
482 | ||
483 | /* Returning 0 will take to next memory range */ | |
3fe4f499 DH |
484 | |
485 | /* Don't use memory that will be detected and handled by a driver. */ | |
7cf603d1 | 486 | if (res->flags & IORESOURCE_SYSRAM_DRIVER_MANAGED) |
3fe4f499 DH |
487 | return 0; |
488 | ||
a43cac0d DY |
489 | if (sz < kbuf->memsz) |
490 | return 0; | |
491 | ||
492 | if (end < kbuf->buf_min || start > kbuf->buf_max) | |
493 | return 0; | |
494 | ||
495 | /* | |
496 | * Allocate memory top down with-in ram range. Otherwise bottom up | |
497 | * allocation. | |
498 | */ | |
499 | if (kbuf->top_down) | |
500 | return locate_mem_hole_top_down(start, end, kbuf); | |
501 | return locate_mem_hole_bottom_up(start, end, kbuf); | |
502 | } | |
503 | ||
350e88ba | 504 | #ifdef CONFIG_ARCH_KEEP_MEMBLOCK |
735c2f90 AT |
505 | static int kexec_walk_memblock(struct kexec_buf *kbuf, |
506 | int (*func)(struct resource *, void *)) | |
507 | { | |
508 | int ret = 0; | |
509 | u64 i; | |
510 | phys_addr_t mstart, mend; | |
511 | struct resource res = { }; | |
512 | ||
497e1858 AT |
513 | if (kbuf->image->type == KEXEC_TYPE_CRASH) |
514 | return func(&crashk_res, kbuf); | |
515 | ||
f7892d8e DH |
516 | /* |
517 | * Using MEMBLOCK_NONE will properly skip MEMBLOCK_DRIVER_MANAGED. See | |
518 | * IORESOURCE_SYSRAM_DRIVER_MANAGED handling in | |
519 | * locate_mem_hole_callback(). | |
520 | */ | |
735c2f90 | 521 | if (kbuf->top_down) { |
497e1858 | 522 | for_each_free_mem_range_reverse(i, NUMA_NO_NODE, MEMBLOCK_NONE, |
735c2f90 AT |
523 | &mstart, &mend, NULL) { |
524 | /* | |
525 | * In memblock, end points to the first byte after the | |
526 | * range while in kexec, end points to the last byte | |
527 | * in the range. | |
528 | */ | |
529 | res.start = mstart; | |
530 | res.end = mend - 1; | |
531 | ret = func(&res, kbuf); | |
532 | if (ret) | |
533 | break; | |
534 | } | |
535 | } else { | |
497e1858 AT |
536 | for_each_free_mem_range(i, NUMA_NO_NODE, MEMBLOCK_NONE, |
537 | &mstart, &mend, NULL) { | |
735c2f90 AT |
538 | /* |
539 | * In memblock, end points to the first byte after the | |
540 | * range while in kexec, end points to the last byte | |
541 | * in the range. | |
542 | */ | |
543 | res.start = mstart; | |
544 | res.end = mend - 1; | |
545 | ret = func(&res, kbuf); | |
546 | if (ret) | |
547 | break; | |
548 | } | |
549 | } | |
550 | ||
551 | return ret; | |
552 | } | |
350e88ba MR |
553 | #else |
554 | static int kexec_walk_memblock(struct kexec_buf *kbuf, | |
555 | int (*func)(struct resource *, void *)) | |
556 | { | |
557 | return 0; | |
558 | } | |
735c2f90 AT |
559 | #endif |
560 | ||
60fe3910 | 561 | /** |
735c2f90 | 562 | * kexec_walk_resources - call func(data) on free memory regions |
60fe3910 TJB |
563 | * @kbuf: Context info for the search. Also passed to @func. |
564 | * @func: Function to call for each memory region. | |
565 | * | |
566 | * Return: The memory walk will stop when func returns a non-zero value | |
567 | * and that value will be returned. If all free regions are visited without | |
568 | * func returning non-zero, then zero will be returned. | |
569 | */ | |
735c2f90 AT |
570 | static int kexec_walk_resources(struct kexec_buf *kbuf, |
571 | int (*func)(struct resource *, void *)) | |
60fe3910 TJB |
572 | { |
573 | if (kbuf->image->type == KEXEC_TYPE_CRASH) | |
574 | return walk_iomem_res_desc(crashk_res.desc, | |
575 | IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY, | |
576 | crashk_res.start, crashk_res.end, | |
577 | kbuf, func); | |
578 | else | |
579 | return walk_system_ram_res(0, ULONG_MAX, kbuf, func); | |
580 | } | |
581 | ||
e2e806f9 TJB |
582 | /** |
583 | * kexec_locate_mem_hole - find free memory for the purgatory or the next kernel | |
584 | * @kbuf: Parameters for the memory search. | |
585 | * | |
586 | * On success, kbuf->mem will have the start address of the memory region found. | |
587 | * | |
588 | * Return: 0 on success, negative errno on error. | |
589 | */ | |
590 | int kexec_locate_mem_hole(struct kexec_buf *kbuf) | |
591 | { | |
592 | int ret; | |
593 | ||
b6664ba4 AT |
594 | /* Arch knows where to place */ |
595 | if (kbuf->mem != KEXEC_BUF_MEM_UNKNOWN) | |
596 | return 0; | |
597 | ||
350e88ba | 598 | if (!IS_ENABLED(CONFIG_ARCH_KEEP_MEMBLOCK)) |
735c2f90 AT |
599 | ret = kexec_walk_resources(kbuf, locate_mem_hole_callback); |
600 | else | |
601 | ret = kexec_walk_memblock(kbuf, locate_mem_hole_callback); | |
e2e806f9 TJB |
602 | |
603 | return ret == 1 ? 0 : -EADDRNOTAVAIL; | |
604 | } | |
605 | ||
ec2b9bfa TJB |
606 | /** |
607 | * kexec_add_buffer - place a buffer in a kexec segment | |
608 | * @kbuf: Buffer contents and memory parameters. | |
609 | * | |
610 | * This function assumes that kexec_mutex is held. | |
611 | * On successful return, @kbuf->mem will have the physical address of | |
612 | * the buffer in memory. | |
613 | * | |
614 | * Return: 0 on success, negative errno on error. | |
a43cac0d | 615 | */ |
ec2b9bfa | 616 | int kexec_add_buffer(struct kexec_buf *kbuf) |
a43cac0d | 617 | { |
a43cac0d | 618 | struct kexec_segment *ksegment; |
a43cac0d DY |
619 | int ret; |
620 | ||
621 | /* Currently adding segment this way is allowed only in file mode */ | |
ec2b9bfa | 622 | if (!kbuf->image->file_mode) |
a43cac0d DY |
623 | return -EINVAL; |
624 | ||
ec2b9bfa | 625 | if (kbuf->image->nr_segments >= KEXEC_SEGMENT_MAX) |
a43cac0d DY |
626 | return -EINVAL; |
627 | ||
628 | /* | |
629 | * Make sure we are not trying to add buffer after allocating | |
630 | * control pages. All segments need to be placed first before | |
631 | * any control pages are allocated. As control page allocation | |
632 | * logic goes through list of segments to make sure there are | |
633 | * no destination overlaps. | |
634 | */ | |
ec2b9bfa | 635 | if (!list_empty(&kbuf->image->control_pages)) { |
a43cac0d DY |
636 | WARN_ON(1); |
637 | return -EINVAL; | |
638 | } | |
639 | ||
ec2b9bfa TJB |
640 | /* Ensure minimum alignment needed for segments. */ |
641 | kbuf->memsz = ALIGN(kbuf->memsz, PAGE_SIZE); | |
642 | kbuf->buf_align = max(kbuf->buf_align, PAGE_SIZE); | |
a43cac0d DY |
643 | |
644 | /* Walk the RAM ranges and allocate a suitable range for the buffer */ | |
f891f197 | 645 | ret = arch_kexec_locate_mem_hole(kbuf); |
e2e806f9 TJB |
646 | if (ret) |
647 | return ret; | |
a43cac0d DY |
648 | |
649 | /* Found a suitable memory range */ | |
ec2b9bfa | 650 | ksegment = &kbuf->image->segment[kbuf->image->nr_segments]; |
a43cac0d DY |
651 | ksegment->kbuf = kbuf->buffer; |
652 | ksegment->bufsz = kbuf->bufsz; | |
653 | ksegment->mem = kbuf->mem; | |
654 | ksegment->memsz = kbuf->memsz; | |
ec2b9bfa | 655 | kbuf->image->nr_segments++; |
a43cac0d DY |
656 | return 0; |
657 | } | |
658 | ||
659 | /* Calculate and store the digest of segments */ | |
660 | static int kexec_calculate_store_digests(struct kimage *image) | |
661 | { | |
662 | struct crypto_shash *tfm; | |
663 | struct shash_desc *desc; | |
664 | int ret = 0, i, j, zero_buf_sz, sha_region_sz; | |
665 | size_t desc_size, nullsz; | |
666 | char *digest; | |
667 | void *zero_buf; | |
668 | struct kexec_sha_region *sha_regions; | |
669 | struct purgatory_info *pi = &image->purgatory_info; | |
670 | ||
b799a09f AT |
671 | if (!IS_ENABLED(CONFIG_ARCH_HAS_KEXEC_PURGATORY)) |
672 | return 0; | |
673 | ||
a43cac0d DY |
674 | zero_buf = __va(page_to_pfn(ZERO_PAGE(0)) << PAGE_SHIFT); |
675 | zero_buf_sz = PAGE_SIZE; | |
676 | ||
677 | tfm = crypto_alloc_shash("sha256", 0, 0); | |
678 | if (IS_ERR(tfm)) { | |
679 | ret = PTR_ERR(tfm); | |
680 | goto out; | |
681 | } | |
682 | ||
683 | desc_size = crypto_shash_descsize(tfm) + sizeof(*desc); | |
684 | desc = kzalloc(desc_size, GFP_KERNEL); | |
685 | if (!desc) { | |
686 | ret = -ENOMEM; | |
687 | goto out_free_tfm; | |
688 | } | |
689 | ||
690 | sha_region_sz = KEXEC_SEGMENT_MAX * sizeof(struct kexec_sha_region); | |
691 | sha_regions = vzalloc(sha_region_sz); | |
31d82c2c JJB |
692 | if (!sha_regions) { |
693 | ret = -ENOMEM; | |
a43cac0d | 694 | goto out_free_desc; |
31d82c2c | 695 | } |
a43cac0d DY |
696 | |
697 | desc->tfm = tfm; | |
a43cac0d DY |
698 | |
699 | ret = crypto_shash_init(desc); | |
700 | if (ret < 0) | |
701 | goto out_free_sha_regions; | |
702 | ||
703 | digest = kzalloc(SHA256_DIGEST_SIZE, GFP_KERNEL); | |
704 | if (!digest) { | |
705 | ret = -ENOMEM; | |
706 | goto out_free_sha_regions; | |
707 | } | |
708 | ||
709 | for (j = i = 0; i < image->nr_segments; i++) { | |
710 | struct kexec_segment *ksegment; | |
711 | ||
712 | ksegment = &image->segment[i]; | |
713 | /* | |
714 | * Skip purgatory as it will be modified once we put digest | |
715 | * info in purgatory. | |
716 | */ | |
717 | if (ksegment->kbuf == pi->purgatory_buf) | |
718 | continue; | |
719 | ||
720 | ret = crypto_shash_update(desc, ksegment->kbuf, | |
721 | ksegment->bufsz); | |
722 | if (ret) | |
723 | break; | |
724 | ||
725 | /* | |
726 | * Assume rest of the buffer is filled with zero and | |
727 | * update digest accordingly. | |
728 | */ | |
729 | nullsz = ksegment->memsz - ksegment->bufsz; | |
730 | while (nullsz) { | |
731 | unsigned long bytes = nullsz; | |
732 | ||
733 | if (bytes > zero_buf_sz) | |
734 | bytes = zero_buf_sz; | |
735 | ret = crypto_shash_update(desc, zero_buf, bytes); | |
736 | if (ret) | |
737 | break; | |
738 | nullsz -= bytes; | |
739 | } | |
740 | ||
741 | if (ret) | |
742 | break; | |
743 | ||
744 | sha_regions[j].start = ksegment->mem; | |
745 | sha_regions[j].len = ksegment->memsz; | |
746 | j++; | |
747 | } | |
748 | ||
749 | if (!ret) { | |
750 | ret = crypto_shash_final(desc, digest); | |
751 | if (ret) | |
752 | goto out_free_digest; | |
40c50c1f TG |
753 | ret = kexec_purgatory_get_set_symbol(image, "purgatory_sha_regions", |
754 | sha_regions, sha_region_sz, 0); | |
a43cac0d DY |
755 | if (ret) |
756 | goto out_free_digest; | |
757 | ||
40c50c1f TG |
758 | ret = kexec_purgatory_get_set_symbol(image, "purgatory_sha256_digest", |
759 | digest, SHA256_DIGEST_SIZE, 0); | |
a43cac0d DY |
760 | if (ret) |
761 | goto out_free_digest; | |
762 | } | |
763 | ||
764 | out_free_digest: | |
765 | kfree(digest); | |
766 | out_free_sha_regions: | |
767 | vfree(sha_regions); | |
768 | out_free_desc: | |
769 | kfree(desc); | |
770 | out_free_tfm: | |
771 | kfree(tfm); | |
772 | out: | |
773 | return ret; | |
774 | } | |
775 | ||
b799a09f | 776 | #ifdef CONFIG_ARCH_HAS_KEXEC_PURGATORY |
93045705 PR |
777 | /* |
778 | * kexec_purgatory_setup_kbuf - prepare buffer to load purgatory. | |
779 | * @pi: Purgatory to be loaded. | |
780 | * @kbuf: Buffer to setup. | |
781 | * | |
782 | * Allocates the memory needed for the buffer. Caller is responsible to free | |
783 | * the memory after use. | |
784 | * | |
785 | * Return: 0 on success, negative errno on error. | |
786 | */ | |
787 | static int kexec_purgatory_setup_kbuf(struct purgatory_info *pi, | |
788 | struct kexec_buf *kbuf) | |
a43cac0d | 789 | { |
93045705 PR |
790 | const Elf_Shdr *sechdrs; |
791 | unsigned long bss_align; | |
792 | unsigned long bss_sz; | |
793 | unsigned long align; | |
794 | int i, ret; | |
a43cac0d | 795 | |
93045705 | 796 | sechdrs = (void *)pi->ehdr + pi->ehdr->e_shoff; |
3be3f61d PR |
797 | kbuf->buf_align = bss_align = 1; |
798 | kbuf->bufsz = bss_sz = 0; | |
93045705 PR |
799 | |
800 | for (i = 0; i < pi->ehdr->e_shnum; i++) { | |
801 | if (!(sechdrs[i].sh_flags & SHF_ALLOC)) | |
802 | continue; | |
803 | ||
804 | align = sechdrs[i].sh_addralign; | |
805 | if (sechdrs[i].sh_type != SHT_NOBITS) { | |
806 | if (kbuf->buf_align < align) | |
807 | kbuf->buf_align = align; | |
808 | kbuf->bufsz = ALIGN(kbuf->bufsz, align); | |
809 | kbuf->bufsz += sechdrs[i].sh_size; | |
810 | } else { | |
811 | if (bss_align < align) | |
812 | bss_align = align; | |
813 | bss_sz = ALIGN(bss_sz, align); | |
814 | bss_sz += sechdrs[i].sh_size; | |
815 | } | |
816 | } | |
817 | kbuf->bufsz = ALIGN(kbuf->bufsz, bss_align); | |
818 | kbuf->memsz = kbuf->bufsz + bss_sz; | |
819 | if (kbuf->buf_align < bss_align) | |
820 | kbuf->buf_align = bss_align; | |
821 | ||
822 | kbuf->buffer = vzalloc(kbuf->bufsz); | |
823 | if (!kbuf->buffer) | |
824 | return -ENOMEM; | |
825 | pi->purgatory_buf = kbuf->buffer; | |
826 | ||
827 | ret = kexec_add_buffer(kbuf); | |
828 | if (ret) | |
829 | goto out; | |
93045705 PR |
830 | |
831 | return 0; | |
832 | out: | |
833 | vfree(pi->purgatory_buf); | |
834 | pi->purgatory_buf = NULL; | |
835 | return ret; | |
836 | } | |
837 | ||
838 | /* | |
839 | * kexec_purgatory_setup_sechdrs - prepares the pi->sechdrs buffer. | |
840 | * @pi: Purgatory to be loaded. | |
841 | * @kbuf: Buffer prepared to store purgatory. | |
842 | * | |
843 | * Allocates the memory needed for the buffer. Caller is responsible to free | |
844 | * the memory after use. | |
845 | * | |
846 | * Return: 0 on success, negative errno on error. | |
847 | */ | |
848 | static int kexec_purgatory_setup_sechdrs(struct purgatory_info *pi, | |
849 | struct kexec_buf *kbuf) | |
850 | { | |
93045705 PR |
851 | unsigned long bss_addr; |
852 | unsigned long offset; | |
93045705 | 853 | Elf_Shdr *sechdrs; |
93045705 | 854 | int i; |
a43cac0d | 855 | |
8da0b724 PR |
856 | /* |
857 | * The section headers in kexec_purgatory are read-only. In order to | |
858 | * have them modifiable make a temporary copy. | |
859 | */ | |
fad953ce | 860 | sechdrs = vzalloc(array_size(sizeof(Elf_Shdr), pi->ehdr->e_shnum)); |
a43cac0d DY |
861 | if (!sechdrs) |
862 | return -ENOMEM; | |
93045705 PR |
863 | memcpy(sechdrs, (void *)pi->ehdr + pi->ehdr->e_shoff, |
864 | pi->ehdr->e_shnum * sizeof(Elf_Shdr)); | |
865 | pi->sechdrs = sechdrs; | |
a43cac0d | 866 | |
620f697c PR |
867 | offset = 0; |
868 | bss_addr = kbuf->mem + kbuf->bufsz; | |
f1b1cca3 | 869 | kbuf->image->start = pi->ehdr->e_entry; |
a43cac0d DY |
870 | |
871 | for (i = 0; i < pi->ehdr->e_shnum; i++) { | |
93045705 | 872 | unsigned long align; |
620f697c | 873 | void *src, *dst; |
93045705 | 874 | |
a43cac0d DY |
875 | if (!(sechdrs[i].sh_flags & SHF_ALLOC)) |
876 | continue; | |
877 | ||
878 | align = sechdrs[i].sh_addralign; | |
f1b1cca3 | 879 | if (sechdrs[i].sh_type == SHT_NOBITS) { |
a43cac0d DY |
880 | bss_addr = ALIGN(bss_addr, align); |
881 | sechdrs[i].sh_addr = bss_addr; | |
882 | bss_addr += sechdrs[i].sh_size; | |
f1b1cca3 PR |
883 | continue; |
884 | } | |
885 | ||
620f697c | 886 | offset = ALIGN(offset, align); |
f1b1cca3 PR |
887 | if (sechdrs[i].sh_flags & SHF_EXECINSTR && |
888 | pi->ehdr->e_entry >= sechdrs[i].sh_addr && | |
889 | pi->ehdr->e_entry < (sechdrs[i].sh_addr | |
890 | + sechdrs[i].sh_size)) { | |
891 | kbuf->image->start -= sechdrs[i].sh_addr; | |
620f697c | 892 | kbuf->image->start += kbuf->mem + offset; |
a43cac0d | 893 | } |
a43cac0d | 894 | |
8da0b724 | 895 | src = (void *)pi->ehdr + sechdrs[i].sh_offset; |
620f697c PR |
896 | dst = pi->purgatory_buf + offset; |
897 | memcpy(dst, src, sechdrs[i].sh_size); | |
898 | ||
899 | sechdrs[i].sh_addr = kbuf->mem + offset; | |
8da0b724 | 900 | sechdrs[i].sh_offset = offset; |
620f697c | 901 | offset += sechdrs[i].sh_size; |
f1b1cca3 | 902 | } |
a43cac0d | 903 | |
93045705 | 904 | return 0; |
a43cac0d DY |
905 | } |
906 | ||
907 | static int kexec_apply_relocations(struct kimage *image) | |
908 | { | |
909 | int i, ret; | |
910 | struct purgatory_info *pi = &image->purgatory_info; | |
8aec395b PR |
911 | const Elf_Shdr *sechdrs; |
912 | ||
913 | sechdrs = (void *)pi->ehdr + pi->ehdr->e_shoff; | |
a43cac0d | 914 | |
a43cac0d | 915 | for (i = 0; i < pi->ehdr->e_shnum; i++) { |
8aec395b PR |
916 | const Elf_Shdr *relsec; |
917 | const Elf_Shdr *symtab; | |
918 | Elf_Shdr *section; | |
919 | ||
920 | relsec = sechdrs + i; | |
a43cac0d | 921 | |
8aec395b PR |
922 | if (relsec->sh_type != SHT_RELA && |
923 | relsec->sh_type != SHT_REL) | |
a43cac0d DY |
924 | continue; |
925 | ||
926 | /* | |
927 | * For section of type SHT_RELA/SHT_REL, | |
928 | * ->sh_link contains section header index of associated | |
929 | * symbol table. And ->sh_info contains section header | |
930 | * index of section to which relocations apply. | |
931 | */ | |
8aec395b PR |
932 | if (relsec->sh_info >= pi->ehdr->e_shnum || |
933 | relsec->sh_link >= pi->ehdr->e_shnum) | |
a43cac0d DY |
934 | return -ENOEXEC; |
935 | ||
8aec395b PR |
936 | section = pi->sechdrs + relsec->sh_info; |
937 | symtab = sechdrs + relsec->sh_link; | |
a43cac0d DY |
938 | |
939 | if (!(section->sh_flags & SHF_ALLOC)) | |
940 | continue; | |
941 | ||
942 | /* | |
943 | * symtab->sh_link contain section header index of associated | |
944 | * string table. | |
945 | */ | |
946 | if (symtab->sh_link >= pi->ehdr->e_shnum) | |
947 | /* Invalid section number? */ | |
948 | continue; | |
949 | ||
950 | /* | |
951 | * Respective architecture needs to provide support for applying | |
952 | * relocations of type SHT_RELA/SHT_REL. | |
953 | */ | |
8aec395b PR |
954 | if (relsec->sh_type == SHT_RELA) |
955 | ret = arch_kexec_apply_relocations_add(pi, section, | |
956 | relsec, symtab); | |
957 | else if (relsec->sh_type == SHT_REL) | |
958 | ret = arch_kexec_apply_relocations(pi, section, | |
959 | relsec, symtab); | |
a43cac0d DY |
960 | if (ret) |
961 | return ret; | |
962 | } | |
963 | ||
964 | return 0; | |
965 | } | |
966 | ||
3be3f61d PR |
967 | /* |
968 | * kexec_load_purgatory - Load and relocate the purgatory object. | |
969 | * @image: Image to add the purgatory to. | |
970 | * @kbuf: Memory parameters to use. | |
971 | * | |
972 | * Allocates the memory needed for image->purgatory_info.sechdrs and | |
973 | * image->purgatory_info.purgatory_buf/kbuf->buffer. Caller is responsible | |
974 | * to free the memory after use. | |
975 | * | |
976 | * Return: 0 on success, negative errno on error. | |
977 | */ | |
978 | int kexec_load_purgatory(struct kimage *image, struct kexec_buf *kbuf) | |
a43cac0d DY |
979 | { |
980 | struct purgatory_info *pi = &image->purgatory_info; | |
981 | int ret; | |
982 | ||
983 | if (kexec_purgatory_size <= 0) | |
984 | return -EINVAL; | |
985 | ||
65c225d3 | 986 | pi->ehdr = (const Elf_Ehdr *)kexec_purgatory; |
a43cac0d | 987 | |
3be3f61d | 988 | ret = kexec_purgatory_setup_kbuf(pi, kbuf); |
a43cac0d DY |
989 | if (ret) |
990 | return ret; | |
991 | ||
3be3f61d | 992 | ret = kexec_purgatory_setup_sechdrs(pi, kbuf); |
93045705 PR |
993 | if (ret) |
994 | goto out_free_kbuf; | |
995 | ||
a43cac0d DY |
996 | ret = kexec_apply_relocations(image); |
997 | if (ret) | |
998 | goto out; | |
999 | ||
a43cac0d DY |
1000 | return 0; |
1001 | out: | |
1002 | vfree(pi->sechdrs); | |
070c43ee | 1003 | pi->sechdrs = NULL; |
93045705 | 1004 | out_free_kbuf: |
a43cac0d | 1005 | vfree(pi->purgatory_buf); |
070c43ee | 1006 | pi->purgatory_buf = NULL; |
a43cac0d DY |
1007 | return ret; |
1008 | } | |
1009 | ||
961d921a PR |
1010 | /* |
1011 | * kexec_purgatory_find_symbol - find a symbol in the purgatory | |
1012 | * @pi: Purgatory to search in. | |
1013 | * @name: Name of the symbol. | |
1014 | * | |
1015 | * Return: pointer to symbol in read-only symtab on success, NULL on error. | |
1016 | */ | |
1017 | static const Elf_Sym *kexec_purgatory_find_symbol(struct purgatory_info *pi, | |
1018 | const char *name) | |
a43cac0d | 1019 | { |
961d921a | 1020 | const Elf_Shdr *sechdrs; |
65c225d3 | 1021 | const Elf_Ehdr *ehdr; |
961d921a | 1022 | const Elf_Sym *syms; |
a43cac0d | 1023 | const char *strtab; |
961d921a | 1024 | int i, k; |
a43cac0d | 1025 | |
961d921a | 1026 | if (!pi->ehdr) |
a43cac0d DY |
1027 | return NULL; |
1028 | ||
a43cac0d | 1029 | ehdr = pi->ehdr; |
961d921a | 1030 | sechdrs = (void *)ehdr + ehdr->e_shoff; |
a43cac0d DY |
1031 | |
1032 | for (i = 0; i < ehdr->e_shnum; i++) { | |
1033 | if (sechdrs[i].sh_type != SHT_SYMTAB) | |
1034 | continue; | |
1035 | ||
1036 | if (sechdrs[i].sh_link >= ehdr->e_shnum) | |
1037 | /* Invalid strtab section number */ | |
1038 | continue; | |
961d921a PR |
1039 | strtab = (void *)ehdr + sechdrs[sechdrs[i].sh_link].sh_offset; |
1040 | syms = (void *)ehdr + sechdrs[i].sh_offset; | |
a43cac0d DY |
1041 | |
1042 | /* Go through symbols for a match */ | |
1043 | for (k = 0; k < sechdrs[i].sh_size/sizeof(Elf_Sym); k++) { | |
1044 | if (ELF_ST_BIND(syms[k].st_info) != STB_GLOBAL) | |
1045 | continue; | |
1046 | ||
1047 | if (strcmp(strtab + syms[k].st_name, name) != 0) | |
1048 | continue; | |
1049 | ||
1050 | if (syms[k].st_shndx == SHN_UNDEF || | |
1051 | syms[k].st_shndx >= ehdr->e_shnum) { | |
1052 | pr_debug("Symbol: %s has bad section index %d.\n", | |
1053 | name, syms[k].st_shndx); | |
1054 | return NULL; | |
1055 | } | |
1056 | ||
1057 | /* Found the symbol we are looking for */ | |
1058 | return &syms[k]; | |
1059 | } | |
1060 | } | |
1061 | ||
1062 | return NULL; | |
1063 | } | |
1064 | ||
1065 | void *kexec_purgatory_get_symbol_addr(struct kimage *image, const char *name) | |
1066 | { | |
1067 | struct purgatory_info *pi = &image->purgatory_info; | |
961d921a | 1068 | const Elf_Sym *sym; |
a43cac0d DY |
1069 | Elf_Shdr *sechdr; |
1070 | ||
1071 | sym = kexec_purgatory_find_symbol(pi, name); | |
1072 | if (!sym) | |
1073 | return ERR_PTR(-EINVAL); | |
1074 | ||
1075 | sechdr = &pi->sechdrs[sym->st_shndx]; | |
1076 | ||
1077 | /* | |
1078 | * Returns the address where symbol will finally be loaded after | |
1079 | * kexec_load_segment() | |
1080 | */ | |
1081 | return (void *)(sechdr->sh_addr + sym->st_value); | |
1082 | } | |
1083 | ||
1084 | /* | |
1085 | * Get or set value of a symbol. If "get_value" is true, symbol value is | |
1086 | * returned in buf otherwise symbol value is set based on value in buf. | |
1087 | */ | |
1088 | int kexec_purgatory_get_set_symbol(struct kimage *image, const char *name, | |
1089 | void *buf, unsigned int size, bool get_value) | |
1090 | { | |
a43cac0d | 1091 | struct purgatory_info *pi = &image->purgatory_info; |
961d921a PR |
1092 | const Elf_Sym *sym; |
1093 | Elf_Shdr *sec; | |
a43cac0d DY |
1094 | char *sym_buf; |
1095 | ||
1096 | sym = kexec_purgatory_find_symbol(pi, name); | |
1097 | if (!sym) | |
1098 | return -EINVAL; | |
1099 | ||
1100 | if (sym->st_size != size) { | |
1101 | pr_err("symbol %s size mismatch: expected %lu actual %u\n", | |
1102 | name, (unsigned long)sym->st_size, size); | |
1103 | return -EINVAL; | |
1104 | } | |
1105 | ||
961d921a | 1106 | sec = pi->sechdrs + sym->st_shndx; |
a43cac0d | 1107 | |
961d921a | 1108 | if (sec->sh_type == SHT_NOBITS) { |
a43cac0d DY |
1109 | pr_err("symbol %s is in a bss section. Cannot %s\n", name, |
1110 | get_value ? "get" : "set"); | |
1111 | return -EINVAL; | |
1112 | } | |
1113 | ||
8da0b724 | 1114 | sym_buf = (char *)pi->purgatory_buf + sec->sh_offset + sym->st_value; |
a43cac0d DY |
1115 | |
1116 | if (get_value) | |
1117 | memcpy((void *)buf, sym_buf, size); | |
1118 | else | |
1119 | memcpy((void *)sym_buf, buf, size); | |
1120 | ||
1121 | return 0; | |
1122 | } | |
b799a09f | 1123 | #endif /* CONFIG_ARCH_HAS_KEXEC_PURGATORY */ |
babac4a8 AT |
1124 | |
1125 | int crash_exclude_mem_range(struct crash_mem *mem, | |
1126 | unsigned long long mstart, unsigned long long mend) | |
1127 | { | |
1128 | int i, j; | |
a2e9a95d | 1129 | unsigned long long start, end, p_start, p_end; |
babac4a8 AT |
1130 | struct crash_mem_range temp_range = {0, 0}; |
1131 | ||
1132 | for (i = 0; i < mem->nr_ranges; i++) { | |
1133 | start = mem->ranges[i].start; | |
1134 | end = mem->ranges[i].end; | |
a2e9a95d LJ |
1135 | p_start = mstart; |
1136 | p_end = mend; | |
babac4a8 AT |
1137 | |
1138 | if (mstart > end || mend < start) | |
1139 | continue; | |
1140 | ||
1141 | /* Truncate any area outside of range */ | |
1142 | if (mstart < start) | |
a2e9a95d | 1143 | p_start = start; |
babac4a8 | 1144 | if (mend > end) |
a2e9a95d | 1145 | p_end = end; |
babac4a8 AT |
1146 | |
1147 | /* Found completely overlapping range */ | |
a2e9a95d | 1148 | if (p_start == start && p_end == end) { |
babac4a8 AT |
1149 | mem->ranges[i].start = 0; |
1150 | mem->ranges[i].end = 0; | |
1151 | if (i < mem->nr_ranges - 1) { | |
1152 | /* Shift rest of the ranges to left */ | |
1153 | for (j = i; j < mem->nr_ranges - 1; j++) { | |
1154 | mem->ranges[j].start = | |
1155 | mem->ranges[j+1].start; | |
1156 | mem->ranges[j].end = | |
1157 | mem->ranges[j+1].end; | |
1158 | } | |
a2e9a95d LJ |
1159 | |
1160 | /* | |
1161 | * Continue to check if there are another overlapping ranges | |
1162 | * from the current position because of shifting the above | |
1163 | * mem ranges. | |
1164 | */ | |
1165 | i--; | |
1166 | mem->nr_ranges--; | |
1167 | continue; | |
babac4a8 AT |
1168 | } |
1169 | mem->nr_ranges--; | |
1170 | return 0; | |
1171 | } | |
1172 | ||
a2e9a95d | 1173 | if (p_start > start && p_end < end) { |
babac4a8 | 1174 | /* Split original range */ |
a2e9a95d LJ |
1175 | mem->ranges[i].end = p_start - 1; |
1176 | temp_range.start = p_end + 1; | |
babac4a8 | 1177 | temp_range.end = end; |
a2e9a95d LJ |
1178 | } else if (p_start != start) |
1179 | mem->ranges[i].end = p_start - 1; | |
babac4a8 | 1180 | else |
a2e9a95d | 1181 | mem->ranges[i].start = p_end + 1; |
babac4a8 AT |
1182 | break; |
1183 | } | |
1184 | ||
1185 | /* If a split happened, add the split to array */ | |
1186 | if (!temp_range.end) | |
1187 | return 0; | |
1188 | ||
1189 | /* Split happened */ | |
1190 | if (i == mem->max_nr_ranges - 1) | |
1191 | return -ENOMEM; | |
1192 | ||
1193 | /* Location where new range should go */ | |
1194 | j = i + 1; | |
1195 | if (j < mem->nr_ranges) { | |
1196 | /* Move over all ranges one slot towards the end */ | |
1197 | for (i = mem->nr_ranges - 1; i >= j; i--) | |
1198 | mem->ranges[i + 1] = mem->ranges[i]; | |
1199 | } | |
1200 | ||
1201 | mem->ranges[j].start = temp_range.start; | |
1202 | mem->ranges[j].end = temp_range.end; | |
1203 | mem->nr_ranges++; | |
1204 | return 0; | |
1205 | } | |
1206 | ||
4853f68d | 1207 | int crash_prepare_elf64_headers(struct crash_mem *mem, int need_kernel_map, |
babac4a8 AT |
1208 | void **addr, unsigned long *sz) |
1209 | { | |
1210 | Elf64_Ehdr *ehdr; | |
1211 | Elf64_Phdr *phdr; | |
1212 | unsigned long nr_cpus = num_possible_cpus(), nr_phdr, elf_sz; | |
1213 | unsigned char *buf; | |
1214 | unsigned int cpu, i; | |
1215 | unsigned long long notes_addr; | |
1216 | unsigned long mstart, mend; | |
1217 | ||
475f63ae | 1218 | /* extra phdr for vmcoreinfo ELF note */ |
babac4a8 AT |
1219 | nr_phdr = nr_cpus + 1; |
1220 | nr_phdr += mem->nr_ranges; | |
1221 | ||
1222 | /* | |
1223 | * kexec-tools creates an extra PT_LOAD phdr for kernel text mapping | |
1224 | * area (for example, ffffffff80000000 - ffffffffa0000000 on x86_64). | |
1225 | * I think this is required by tools like gdb. So same physical | |
475f63ae | 1226 | * memory will be mapped in two ELF headers. One will contain kernel |
babac4a8 AT |
1227 | * text virtual addresses and other will have __va(physical) addresses. |
1228 | */ | |
1229 | ||
1230 | nr_phdr++; | |
1231 | elf_sz = sizeof(Elf64_Ehdr) + nr_phdr * sizeof(Elf64_Phdr); | |
1232 | elf_sz = ALIGN(elf_sz, ELF_CORE_HEADER_ALIGN); | |
1233 | ||
1234 | buf = vzalloc(elf_sz); | |
1235 | if (!buf) | |
1236 | return -ENOMEM; | |
1237 | ||
1238 | ehdr = (Elf64_Ehdr *)buf; | |
1239 | phdr = (Elf64_Phdr *)(ehdr + 1); | |
1240 | memcpy(ehdr->e_ident, ELFMAG, SELFMAG); | |
1241 | ehdr->e_ident[EI_CLASS] = ELFCLASS64; | |
1242 | ehdr->e_ident[EI_DATA] = ELFDATA2LSB; | |
1243 | ehdr->e_ident[EI_VERSION] = EV_CURRENT; | |
1244 | ehdr->e_ident[EI_OSABI] = ELF_OSABI; | |
1245 | memset(ehdr->e_ident + EI_PAD, 0, EI_NIDENT - EI_PAD); | |
1246 | ehdr->e_type = ET_CORE; | |
1247 | ehdr->e_machine = ELF_ARCH; | |
1248 | ehdr->e_version = EV_CURRENT; | |
1249 | ehdr->e_phoff = sizeof(Elf64_Ehdr); | |
1250 | ehdr->e_ehsize = sizeof(Elf64_Ehdr); | |
1251 | ehdr->e_phentsize = sizeof(Elf64_Phdr); | |
1252 | ||
a2e9a95d | 1253 | /* Prepare one phdr of type PT_NOTE for each present CPU */ |
babac4a8 AT |
1254 | for_each_present_cpu(cpu) { |
1255 | phdr->p_type = PT_NOTE; | |
1256 | notes_addr = per_cpu_ptr_to_phys(per_cpu_ptr(crash_notes, cpu)); | |
1257 | phdr->p_offset = phdr->p_paddr = notes_addr; | |
1258 | phdr->p_filesz = phdr->p_memsz = sizeof(note_buf_t); | |
1259 | (ehdr->e_phnum)++; | |
1260 | phdr++; | |
1261 | } | |
1262 | ||
1263 | /* Prepare one PT_NOTE header for vmcoreinfo */ | |
1264 | phdr->p_type = PT_NOTE; | |
1265 | phdr->p_offset = phdr->p_paddr = paddr_vmcoreinfo_note(); | |
1266 | phdr->p_filesz = phdr->p_memsz = VMCOREINFO_NOTE_SIZE; | |
1267 | (ehdr->e_phnum)++; | |
1268 | phdr++; | |
1269 | ||
1270 | /* Prepare PT_LOAD type program header for kernel text region */ | |
4853f68d | 1271 | if (need_kernel_map) { |
babac4a8 AT |
1272 | phdr->p_type = PT_LOAD; |
1273 | phdr->p_flags = PF_R|PF_W|PF_X; | |
f973cce0 | 1274 | phdr->p_vaddr = (unsigned long) _text; |
babac4a8 AT |
1275 | phdr->p_filesz = phdr->p_memsz = _end - _text; |
1276 | phdr->p_offset = phdr->p_paddr = __pa_symbol(_text); | |
1277 | ehdr->e_phnum++; | |
1278 | phdr++; | |
1279 | } | |
1280 | ||
1281 | /* Go through all the ranges in mem->ranges[] and prepare phdr */ | |
1282 | for (i = 0; i < mem->nr_ranges; i++) { | |
1283 | mstart = mem->ranges[i].start; | |
1284 | mend = mem->ranges[i].end; | |
1285 | ||
1286 | phdr->p_type = PT_LOAD; | |
1287 | phdr->p_flags = PF_R|PF_W|PF_X; | |
1288 | phdr->p_offset = mstart; | |
1289 | ||
1290 | phdr->p_paddr = mstart; | |
f973cce0 | 1291 | phdr->p_vaddr = (unsigned long) __va(mstart); |
babac4a8 AT |
1292 | phdr->p_filesz = phdr->p_memsz = mend - mstart + 1; |
1293 | phdr->p_align = 0; | |
1294 | ehdr->e_phnum++; | |
475f63ae | 1295 | 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", |
babac4a8 AT |
1296 | phdr, phdr->p_vaddr, phdr->p_paddr, phdr->p_filesz, |
1297 | ehdr->e_phnum, phdr->p_offset); | |
475f63ae | 1298 | phdr++; |
babac4a8 AT |
1299 | } |
1300 | ||
1301 | *addr = buf; | |
1302 | *sz = elf_sz; | |
1303 | return 0; | |
1304 | } |