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175fca3b SS |
1 | // SPDX-License-Identifier: GPL-2.0-only |
2 | /* | |
3 | * Load ELF vmlinux file for the kexec_file_load syscall. | |
4 | * | |
5 | * Copyright (C) 2004 Adam Litke (agl@us.ibm.com) | |
6 | * Copyright (C) 2004 IBM Corp. | |
7 | * Copyright (C) 2005 R Sharada (sharada@in.ibm.com) | |
8 | * Copyright (C) 2006 Mohan Kumar M (mohan@in.ibm.com) | |
9 | * Copyright (C) 2016 IBM Corporation | |
10 | * | |
11 | * Based on kexec-tools' kexec-elf-exec.c and kexec-elf-ppc64.c. | |
12 | * Heavily modified for the kernel by | |
13 | * Thiago Jung Bauermann <bauerman@linux.vnet.ibm.com>. | |
14 | */ | |
15 | ||
16 | #define pr_fmt(fmt) "kexec_elf: " fmt | |
17 | ||
18 | #include <linux/elf.h> | |
19 | #include <linux/kexec.h> | |
20 | #include <linux/module.h> | |
21 | #include <linux/slab.h> | |
22 | #include <linux/types.h> | |
23 | ||
24 | #define PURGATORY_STACK_SIZE (16 * 1024) | |
25 | ||
26 | #define elf_addr_to_cpu elf64_to_cpu | |
27 | ||
28 | #ifndef Elf_Rel | |
29 | #define Elf_Rel Elf64_Rel | |
30 | #endif /* Elf_Rel */ | |
31 | ||
32 | static inline bool elf_is_elf_file(const struct elfhdr *ehdr) | |
33 | { | |
34 | return memcmp(ehdr->e_ident, ELFMAG, SELFMAG) == 0; | |
35 | } | |
36 | ||
37 | static uint64_t elf64_to_cpu(const struct elfhdr *ehdr, uint64_t value) | |
38 | { | |
39 | if (ehdr->e_ident[EI_DATA] == ELFDATA2LSB) | |
40 | value = le64_to_cpu(value); | |
41 | else if (ehdr->e_ident[EI_DATA] == ELFDATA2MSB) | |
42 | value = be64_to_cpu(value); | |
43 | ||
44 | return value; | |
45 | } | |
46 | ||
47 | static uint16_t elf16_to_cpu(const struct elfhdr *ehdr, uint16_t value) | |
48 | { | |
49 | if (ehdr->e_ident[EI_DATA] == ELFDATA2LSB) | |
50 | value = le16_to_cpu(value); | |
51 | else if (ehdr->e_ident[EI_DATA] == ELFDATA2MSB) | |
52 | value = be16_to_cpu(value); | |
53 | ||
54 | return value; | |
55 | } | |
56 | ||
57 | static uint32_t elf32_to_cpu(const struct elfhdr *ehdr, uint32_t value) | |
58 | { | |
59 | if (ehdr->e_ident[EI_DATA] == ELFDATA2LSB) | |
60 | value = le32_to_cpu(value); | |
61 | else if (ehdr->e_ident[EI_DATA] == ELFDATA2MSB) | |
62 | value = be32_to_cpu(value); | |
63 | ||
64 | return value; | |
65 | } | |
66 | ||
67 | /** | |
68 | * elf_is_ehdr_sane - check that it is safe to use the ELF header | |
69 | * @buf_len: size of the buffer in which the ELF file is loaded. | |
70 | */ | |
71 | static bool elf_is_ehdr_sane(const struct elfhdr *ehdr, size_t buf_len) | |
72 | { | |
73 | if (ehdr->e_phnum > 0 && ehdr->e_phentsize != sizeof(struct elf_phdr)) { | |
74 | pr_debug("Bad program header size.\n"); | |
75 | return false; | |
76 | } else if (ehdr->e_shnum > 0 && | |
77 | ehdr->e_shentsize != sizeof(struct elf_shdr)) { | |
78 | pr_debug("Bad section header size.\n"); | |
79 | return false; | |
80 | } else if (ehdr->e_ident[EI_VERSION] != EV_CURRENT || | |
81 | ehdr->e_version != EV_CURRENT) { | |
82 | pr_debug("Unknown ELF version.\n"); | |
83 | return false; | |
84 | } | |
85 | ||
86 | if (ehdr->e_phoff > 0 && ehdr->e_phnum > 0) { | |
87 | size_t phdr_size; | |
88 | ||
89 | /* | |
90 | * e_phnum is at most 65535 so calculating the size of the | |
91 | * program header cannot overflow. | |
92 | */ | |
93 | phdr_size = sizeof(struct elf_phdr) * ehdr->e_phnum; | |
94 | ||
95 | /* Sanity check the program header table location. */ | |
96 | if (ehdr->e_phoff + phdr_size < ehdr->e_phoff) { | |
97 | pr_debug("Program headers at invalid location.\n"); | |
98 | return false; | |
99 | } else if (ehdr->e_phoff + phdr_size > buf_len) { | |
100 | pr_debug("Program headers truncated.\n"); | |
101 | return false; | |
102 | } | |
103 | } | |
104 | ||
105 | if (ehdr->e_shoff > 0 && ehdr->e_shnum > 0) { | |
106 | size_t shdr_size; | |
107 | ||
108 | /* | |
109 | * e_shnum is at most 65536 so calculating | |
110 | * the size of the section header cannot overflow. | |
111 | */ | |
112 | shdr_size = sizeof(struct elf_shdr) * ehdr->e_shnum; | |
113 | ||
114 | /* Sanity check the section header table location. */ | |
115 | if (ehdr->e_shoff + shdr_size < ehdr->e_shoff) { | |
116 | pr_debug("Section headers at invalid location.\n"); | |
117 | return false; | |
118 | } else if (ehdr->e_shoff + shdr_size > buf_len) { | |
119 | pr_debug("Section headers truncated.\n"); | |
120 | return false; | |
121 | } | |
122 | } | |
123 | ||
124 | return true; | |
125 | } | |
126 | ||
127 | static int elf_read_ehdr(const char *buf, size_t len, struct elfhdr *ehdr) | |
128 | { | |
129 | struct elfhdr *buf_ehdr; | |
130 | ||
131 | if (len < sizeof(*buf_ehdr)) { | |
132 | pr_debug("Buffer is too small to hold ELF header.\n"); | |
133 | return -ENOEXEC; | |
134 | } | |
135 | ||
136 | memset(ehdr, 0, sizeof(*ehdr)); | |
137 | memcpy(ehdr->e_ident, buf, sizeof(ehdr->e_ident)); | |
138 | if (!elf_is_elf_file(ehdr)) { | |
139 | pr_debug("No ELF header magic.\n"); | |
140 | return -ENOEXEC; | |
141 | } | |
142 | ||
143 | if (ehdr->e_ident[EI_CLASS] != ELF_CLASS) { | |
144 | pr_debug("Not a supported ELF class.\n"); | |
145 | return -ENOEXEC; | |
146 | } else if (ehdr->e_ident[EI_DATA] != ELFDATA2LSB && | |
147 | ehdr->e_ident[EI_DATA] != ELFDATA2MSB) { | |
148 | pr_debug("Not a supported ELF data format.\n"); | |
149 | return -ENOEXEC; | |
150 | } | |
151 | ||
152 | buf_ehdr = (struct elfhdr *) buf; | |
153 | if (elf16_to_cpu(ehdr, buf_ehdr->e_ehsize) != sizeof(*buf_ehdr)) { | |
154 | pr_debug("Bad ELF header size.\n"); | |
155 | return -ENOEXEC; | |
156 | } | |
157 | ||
158 | ehdr->e_type = elf16_to_cpu(ehdr, buf_ehdr->e_type); | |
159 | ehdr->e_machine = elf16_to_cpu(ehdr, buf_ehdr->e_machine); | |
160 | ehdr->e_version = elf32_to_cpu(ehdr, buf_ehdr->e_version); | |
161 | ehdr->e_entry = elf_addr_to_cpu(ehdr, buf_ehdr->e_entry); | |
162 | ehdr->e_phoff = elf_addr_to_cpu(ehdr, buf_ehdr->e_phoff); | |
163 | ehdr->e_shoff = elf_addr_to_cpu(ehdr, buf_ehdr->e_shoff); | |
164 | ehdr->e_flags = elf32_to_cpu(ehdr, buf_ehdr->e_flags); | |
165 | ehdr->e_phentsize = elf16_to_cpu(ehdr, buf_ehdr->e_phentsize); | |
166 | ehdr->e_phnum = elf16_to_cpu(ehdr, buf_ehdr->e_phnum); | |
167 | ehdr->e_shentsize = elf16_to_cpu(ehdr, buf_ehdr->e_shentsize); | |
168 | ehdr->e_shnum = elf16_to_cpu(ehdr, buf_ehdr->e_shnum); | |
169 | ehdr->e_shstrndx = elf16_to_cpu(ehdr, buf_ehdr->e_shstrndx); | |
170 | ||
171 | return elf_is_ehdr_sane(ehdr, len) ? 0 : -ENOEXEC; | |
172 | } | |
173 | ||
174 | /** | |
175 | * elf_is_phdr_sane - check that it is safe to use the program header | |
176 | * @buf_len: size of the buffer in which the ELF file is loaded. | |
177 | */ | |
178 | static bool elf_is_phdr_sane(const struct elf_phdr *phdr, size_t buf_len) | |
179 | { | |
180 | ||
181 | if (phdr->p_offset + phdr->p_filesz < phdr->p_offset) { | |
182 | pr_debug("ELF segment location wraps around.\n"); | |
183 | return false; | |
184 | } else if (phdr->p_offset + phdr->p_filesz > buf_len) { | |
185 | pr_debug("ELF segment not in file.\n"); | |
186 | return false; | |
187 | } else if (phdr->p_paddr + phdr->p_memsz < phdr->p_paddr) { | |
188 | pr_debug("ELF segment address wraps around.\n"); | |
189 | return false; | |
190 | } | |
191 | ||
192 | return true; | |
193 | } | |
194 | ||
195 | static int elf_read_phdr(const char *buf, size_t len, | |
196 | struct kexec_elf_info *elf_info, | |
197 | int idx) | |
198 | { | |
199 | /* Override the const in proghdrs, we are the ones doing the loading. */ | |
200 | struct elf_phdr *phdr = (struct elf_phdr *) &elf_info->proghdrs[idx]; | |
201 | const char *pbuf; | |
202 | struct elf_phdr *buf_phdr; | |
203 | ||
204 | pbuf = buf + elf_info->ehdr->e_phoff + (idx * sizeof(*buf_phdr)); | |
205 | buf_phdr = (struct elf_phdr *) pbuf; | |
206 | ||
207 | phdr->p_type = elf32_to_cpu(elf_info->ehdr, buf_phdr->p_type); | |
208 | phdr->p_offset = elf_addr_to_cpu(elf_info->ehdr, buf_phdr->p_offset); | |
209 | phdr->p_paddr = elf_addr_to_cpu(elf_info->ehdr, buf_phdr->p_paddr); | |
210 | phdr->p_vaddr = elf_addr_to_cpu(elf_info->ehdr, buf_phdr->p_vaddr); | |
211 | phdr->p_flags = elf32_to_cpu(elf_info->ehdr, buf_phdr->p_flags); | |
212 | ||
213 | /* | |
214 | * The following fields have a type equivalent to Elf_Addr | |
215 | * both in 32 bit and 64 bit ELF. | |
216 | */ | |
217 | phdr->p_filesz = elf_addr_to_cpu(elf_info->ehdr, buf_phdr->p_filesz); | |
218 | phdr->p_memsz = elf_addr_to_cpu(elf_info->ehdr, buf_phdr->p_memsz); | |
219 | phdr->p_align = elf_addr_to_cpu(elf_info->ehdr, buf_phdr->p_align); | |
220 | ||
221 | return elf_is_phdr_sane(phdr, len) ? 0 : -ENOEXEC; | |
222 | } | |
223 | ||
224 | /** | |
225 | * elf_read_phdrs - read the program headers from the buffer | |
226 | * | |
227 | * This function assumes that the program header table was checked for sanity. | |
228 | * Use elf_is_ehdr_sane() if it wasn't. | |
229 | */ | |
230 | static int elf_read_phdrs(const char *buf, size_t len, | |
231 | struct kexec_elf_info *elf_info) | |
232 | { | |
233 | size_t phdr_size, i; | |
234 | const struct elfhdr *ehdr = elf_info->ehdr; | |
235 | ||
236 | /* | |
237 | * e_phnum is at most 65535 so calculating the size of the | |
238 | * program header cannot overflow. | |
239 | */ | |
240 | phdr_size = sizeof(struct elf_phdr) * ehdr->e_phnum; | |
241 | ||
242 | elf_info->proghdrs = kzalloc(phdr_size, GFP_KERNEL); | |
243 | if (!elf_info->proghdrs) | |
244 | return -ENOMEM; | |
245 | ||
246 | for (i = 0; i < ehdr->e_phnum; i++) { | |
247 | int ret; | |
248 | ||
249 | ret = elf_read_phdr(buf, len, elf_info, i); | |
250 | if (ret) { | |
251 | kfree(elf_info->proghdrs); | |
252 | elf_info->proghdrs = NULL; | |
253 | return ret; | |
254 | } | |
255 | } | |
256 | ||
257 | return 0; | |
258 | } | |
259 | ||
260 | /** | |
261 | * elf_is_shdr_sane - check that it is safe to use the section header | |
262 | * @buf_len: size of the buffer in which the ELF file is loaded. | |
263 | */ | |
264 | static bool elf_is_shdr_sane(const struct elf_shdr *shdr, size_t buf_len) | |
265 | { | |
266 | bool size_ok; | |
267 | ||
268 | /* SHT_NULL headers have undefined values, so we can't check them. */ | |
269 | if (shdr->sh_type == SHT_NULL) | |
270 | return true; | |
271 | ||
272 | /* Now verify sh_entsize */ | |
273 | switch (shdr->sh_type) { | |
274 | case SHT_SYMTAB: | |
275 | size_ok = shdr->sh_entsize == sizeof(Elf_Sym); | |
276 | break; | |
277 | case SHT_RELA: | |
278 | size_ok = shdr->sh_entsize == sizeof(Elf_Rela); | |
279 | break; | |
280 | case SHT_DYNAMIC: | |
281 | size_ok = shdr->sh_entsize == sizeof(Elf_Dyn); | |
282 | break; | |
283 | case SHT_REL: | |
284 | size_ok = shdr->sh_entsize == sizeof(Elf_Rel); | |
285 | break; | |
286 | case SHT_NOTE: | |
287 | case SHT_PROGBITS: | |
288 | case SHT_HASH: | |
289 | case SHT_NOBITS: | |
290 | default: | |
291 | /* | |
292 | * This is a section whose entsize requirements | |
293 | * I don't care about. If I don't know about | |
294 | * the section I can't care about it's entsize | |
295 | * requirements. | |
296 | */ | |
297 | size_ok = true; | |
298 | break; | |
299 | } | |
300 | ||
301 | if (!size_ok) { | |
302 | pr_debug("ELF section with wrong entry size.\n"); | |
303 | return false; | |
304 | } else if (shdr->sh_addr + shdr->sh_size < shdr->sh_addr) { | |
305 | pr_debug("ELF section address wraps around.\n"); | |
306 | return false; | |
307 | } | |
308 | ||
309 | if (shdr->sh_type != SHT_NOBITS) { | |
310 | if (shdr->sh_offset + shdr->sh_size < shdr->sh_offset) { | |
311 | pr_debug("ELF section location wraps around.\n"); | |
312 | return false; | |
313 | } else if (shdr->sh_offset + shdr->sh_size > buf_len) { | |
314 | pr_debug("ELF section not in file.\n"); | |
315 | return false; | |
316 | } | |
317 | } | |
318 | ||
319 | return true; | |
320 | } | |
321 | ||
322 | static int elf_read_shdr(const char *buf, size_t len, | |
323 | struct kexec_elf_info *elf_info, | |
324 | int idx) | |
325 | { | |
326 | struct elf_shdr *shdr = &elf_info->sechdrs[idx]; | |
327 | const struct elfhdr *ehdr = elf_info->ehdr; | |
328 | const char *sbuf; | |
329 | struct elf_shdr *buf_shdr; | |
330 | ||
331 | sbuf = buf + ehdr->e_shoff + idx * sizeof(*buf_shdr); | |
332 | buf_shdr = (struct elf_shdr *) sbuf; | |
333 | ||
334 | shdr->sh_name = elf32_to_cpu(ehdr, buf_shdr->sh_name); | |
335 | shdr->sh_type = elf32_to_cpu(ehdr, buf_shdr->sh_type); | |
336 | shdr->sh_addr = elf_addr_to_cpu(ehdr, buf_shdr->sh_addr); | |
337 | shdr->sh_offset = elf_addr_to_cpu(ehdr, buf_shdr->sh_offset); | |
338 | shdr->sh_link = elf32_to_cpu(ehdr, buf_shdr->sh_link); | |
339 | shdr->sh_info = elf32_to_cpu(ehdr, buf_shdr->sh_info); | |
340 | ||
341 | /* | |
342 | * The following fields have a type equivalent to Elf_Addr | |
343 | * both in 32 bit and 64 bit ELF. | |
344 | */ | |
345 | shdr->sh_flags = elf_addr_to_cpu(ehdr, buf_shdr->sh_flags); | |
346 | shdr->sh_size = elf_addr_to_cpu(ehdr, buf_shdr->sh_size); | |
347 | shdr->sh_addralign = elf_addr_to_cpu(ehdr, buf_shdr->sh_addralign); | |
348 | shdr->sh_entsize = elf_addr_to_cpu(ehdr, buf_shdr->sh_entsize); | |
349 | ||
350 | return elf_is_shdr_sane(shdr, len) ? 0 : -ENOEXEC; | |
351 | } | |
352 | ||
353 | /** | |
354 | * elf_read_shdrs - read the section headers from the buffer | |
355 | * | |
356 | * This function assumes that the section header table was checked for sanity. | |
357 | * Use elf_is_ehdr_sane() if it wasn't. | |
358 | */ | |
359 | static int elf_read_shdrs(const char *buf, size_t len, | |
360 | struct kexec_elf_info *elf_info) | |
361 | { | |
362 | size_t shdr_size, i; | |
363 | ||
364 | /* | |
365 | * e_shnum is at most 65536 so calculating | |
366 | * the size of the section header cannot overflow. | |
367 | */ | |
368 | shdr_size = sizeof(struct elf_shdr) * elf_info->ehdr->e_shnum; | |
369 | ||
370 | elf_info->sechdrs = kzalloc(shdr_size, GFP_KERNEL); | |
371 | if (!elf_info->sechdrs) | |
372 | return -ENOMEM; | |
373 | ||
374 | for (i = 0; i < elf_info->ehdr->e_shnum; i++) { | |
375 | int ret; | |
376 | ||
377 | ret = elf_read_shdr(buf, len, elf_info, i); | |
378 | if (ret) { | |
379 | kfree(elf_info->sechdrs); | |
380 | elf_info->sechdrs = NULL; | |
381 | return ret; | |
382 | } | |
383 | } | |
384 | ||
385 | return 0; | |
386 | } | |
387 | ||
388 | /** | |
389 | * elf_read_from_buffer - read ELF file and sets up ELF header and ELF info | |
390 | * @buf: Buffer to read ELF file from. | |
391 | * @len: Size of @buf. | |
392 | * @ehdr: Pointer to existing struct which will be populated. | |
393 | * @elf_info: Pointer to existing struct which will be populated. | |
394 | * | |
395 | * This function allows reading ELF files with different byte order than | |
396 | * the kernel, byte-swapping the fields as needed. | |
397 | * | |
398 | * Return: | |
399 | * On success returns 0, and the caller should call | |
400 | * kexec_free_elf_info(elf_info) to free the memory allocated for the section | |
401 | * and program headers. | |
402 | */ | |
403 | static int elf_read_from_buffer(const char *buf, size_t len, | |
404 | struct elfhdr *ehdr, | |
405 | struct kexec_elf_info *elf_info) | |
406 | { | |
407 | int ret; | |
408 | ||
409 | ret = elf_read_ehdr(buf, len, ehdr); | |
410 | if (ret) | |
411 | return ret; | |
412 | ||
413 | elf_info->buffer = buf; | |
414 | elf_info->ehdr = ehdr; | |
415 | if (ehdr->e_phoff > 0 && ehdr->e_phnum > 0) { | |
416 | ret = elf_read_phdrs(buf, len, elf_info); | |
417 | if (ret) | |
418 | return ret; | |
419 | } | |
420 | if (ehdr->e_shoff > 0 && ehdr->e_shnum > 0) { | |
421 | ret = elf_read_shdrs(buf, len, elf_info); | |
422 | if (ret) { | |
423 | kfree(elf_info->proghdrs); | |
424 | return ret; | |
425 | } | |
426 | } | |
427 | ||
428 | return 0; | |
429 | } | |
430 | ||
431 | /** | |
432 | * kexec_free_elf_info - free memory allocated by elf_read_from_buffer | |
433 | */ | |
434 | void kexec_free_elf_info(struct kexec_elf_info *elf_info) | |
435 | { | |
436 | kfree(elf_info->proghdrs); | |
437 | kfree(elf_info->sechdrs); | |
438 | memset(elf_info, 0, sizeof(*elf_info)); | |
439 | } | |
440 | /** | |
441 | * kexec_build_elf_info - read ELF executable and check that we can use it | |
442 | */ | |
443 | int kexec_build_elf_info(const char *buf, size_t len, struct elfhdr *ehdr, | |
444 | struct kexec_elf_info *elf_info) | |
445 | { | |
446 | int i; | |
447 | int ret; | |
448 | ||
449 | ret = elf_read_from_buffer(buf, len, ehdr, elf_info); | |
450 | if (ret) | |
451 | return ret; | |
452 | ||
453 | /* Big endian vmlinux has type ET_DYN. */ | |
454 | if (ehdr->e_type != ET_EXEC && ehdr->e_type != ET_DYN) { | |
455 | pr_err("Not an ELF executable.\n"); | |
456 | goto error; | |
457 | } else if (!elf_info->proghdrs) { | |
458 | pr_err("No ELF program header.\n"); | |
459 | goto error; | |
460 | } | |
461 | ||
462 | for (i = 0; i < ehdr->e_phnum; i++) { | |
463 | /* | |
464 | * Kexec does not support loading interpreters. | |
465 | * In addition this check keeps us from attempting | |
466 | * to kexec ordinay executables. | |
467 | */ | |
468 | if (elf_info->proghdrs[i].p_type == PT_INTERP) { | |
469 | pr_err("Requires an ELF interpreter.\n"); | |
470 | goto error; | |
471 | } | |
472 | } | |
473 | ||
474 | return 0; | |
475 | error: | |
476 | kexec_free_elf_info(elf_info); | |
477 | return -ENOEXEC; | |
478 | } | |
479 | ||
480 | ||
481 | int kexec_elf_probe(const char *buf, unsigned long len) | |
482 | { | |
483 | struct elfhdr ehdr; | |
484 | struct kexec_elf_info elf_info; | |
485 | int ret; | |
486 | ||
487 | ret = kexec_build_elf_info(buf, len, &ehdr, &elf_info); | |
488 | if (ret) | |
489 | return ret; | |
490 | ||
491 | kexec_free_elf_info(&elf_info); | |
492 | ||
493 | return elf_check_arch(&ehdr) ? 0 : -ENOEXEC; | |
494 | } | |
495 | ||
496 | /** | |
497 | * kexec_elf_load - load ELF executable image | |
498 | * @lowest_load_addr: On return, will be the address where the first PT_LOAD | |
499 | * section will be loaded in memory. | |
500 | * | |
501 | * Return: | |
502 | * 0 on success, negative value on failure. | |
503 | */ | |
504 | int kexec_elf_load(struct kimage *image, struct elfhdr *ehdr, | |
505 | struct kexec_elf_info *elf_info, | |
506 | struct kexec_buf *kbuf, | |
507 | unsigned long *lowest_load_addr) | |
508 | { | |
509 | unsigned long base = 0, lowest_addr = UINT_MAX; | |
510 | int ret; | |
511 | size_t i; | |
512 | ||
513 | /* Read in the PT_LOAD segments. */ | |
514 | for (i = 0; i < ehdr->e_phnum; i++) { | |
515 | unsigned long load_addr; | |
516 | size_t size; | |
517 | const struct elf_phdr *phdr; | |
518 | ||
519 | phdr = &elf_info->proghdrs[i]; | |
520 | if (phdr->p_type != PT_LOAD) | |
521 | continue; | |
522 | ||
523 | size = phdr->p_filesz; | |
524 | if (size > phdr->p_memsz) | |
525 | size = phdr->p_memsz; | |
526 | ||
527 | kbuf->buffer = (void *) elf_info->buffer + phdr->p_offset; | |
528 | kbuf->bufsz = size; | |
529 | kbuf->memsz = phdr->p_memsz; | |
530 | kbuf->buf_align = phdr->p_align; | |
531 | kbuf->buf_min = phdr->p_paddr + base; | |
532 | kbuf->mem = KEXEC_BUF_MEM_UNKNOWN; | |
533 | ret = kexec_add_buffer(kbuf); | |
534 | if (ret) | |
535 | goto out; | |
536 | load_addr = kbuf->mem; | |
537 | ||
538 | if (load_addr < lowest_addr) | |
539 | lowest_addr = load_addr; | |
540 | } | |
541 | ||
542 | /* Update entry point to reflect new load address. */ | |
543 | ehdr->e_entry += base; | |
544 | ||
545 | *lowest_load_addr = lowest_addr; | |
546 | ret = 0; | |
547 | out: | |
548 | return ret; | |
549 | } |