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Commit | Line | Data |
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5234f5eb | 1 | /* |
835c34a1 | 2 | * handle transition of Linux booting another kernel |
5234f5eb EB |
3 | * Copyright (C) 2002-2005 Eric Biederman <ebiederm@xmission.com> |
4 | * | |
5 | * This source code is licensed under the GNU General Public License, | |
6 | * Version 2. See the file COPYING for more details. | |
7 | */ | |
8 | ||
12db5562 VG |
9 | #define pr_fmt(fmt) "kexec: " fmt |
10 | ||
5234f5eb EB |
11 | #include <linux/mm.h> |
12 | #include <linux/kexec.h> | |
5234f5eb | 13 | #include <linux/string.h> |
5a0e3ad6 | 14 | #include <linux/gfp.h> |
5234f5eb | 15 | #include <linux/reboot.h> |
fd59d231 | 16 | #include <linux/numa.h> |
f43fdad8 | 17 | #include <linux/ftrace.h> |
fef3a7a1 | 18 | #include <linux/io.h> |
fee7b0d8 | 19 | #include <linux/suspend.h> |
d6472302 | 20 | #include <linux/vmalloc.h> |
f43fdad8 | 21 | |
9ebdc79f | 22 | #include <asm/init.h> |
5234f5eb | 23 | #include <asm/pgtable.h> |
5234f5eb EB |
24 | #include <asm/tlbflush.h> |
25 | #include <asm/mmu_context.h> | |
8643e28d | 26 | #include <asm/io_apic.h> |
17f557e5 | 27 | #include <asm/debugreg.h> |
27f48d3e | 28 | #include <asm/kexec-bzimage64.h> |
4545c898 | 29 | #include <asm/setup.h> |
d1163651 | 30 | #include <asm/set_memory.h> |
8bf27556 | 31 | |
74ca317c | 32 | #ifdef CONFIG_KEXEC_FILE |
cb105258 | 33 | static struct kexec_file_ops *kexec_file_loaders[] = { |
27f48d3e | 34 | &kexec_bzImage64_ops, |
cb105258 | 35 | }; |
74ca317c | 36 | #endif |
cb105258 | 37 | |
f5deb796 HY |
38 | static void free_transition_pgtable(struct kimage *image) |
39 | { | |
7f689041 | 40 | free_page((unsigned long)image->arch.p4d); |
f5deb796 HY |
41 | free_page((unsigned long)image->arch.pud); |
42 | free_page((unsigned long)image->arch.pmd); | |
43 | free_page((unsigned long)image->arch.pte); | |
44 | } | |
45 | ||
46 | static int init_transition_pgtable(struct kimage *image, pgd_t *pgd) | |
47 | { | |
7f689041 | 48 | p4d_t *p4d; |
f5deb796 HY |
49 | pud_t *pud; |
50 | pmd_t *pmd; | |
51 | pte_t *pte; | |
52 | unsigned long vaddr, paddr; | |
53 | int result = -ENOMEM; | |
54 | ||
55 | vaddr = (unsigned long)relocate_kernel; | |
56 | paddr = __pa(page_address(image->control_code_page)+PAGE_SIZE); | |
57 | pgd += pgd_index(vaddr); | |
58 | if (!pgd_present(*pgd)) { | |
7f689041 KS |
59 | p4d = (p4d_t *)get_zeroed_page(GFP_KERNEL); |
60 | if (!p4d) | |
61 | goto err; | |
62 | image->arch.p4d = p4d; | |
63 | set_pgd(pgd, __pgd(__pa(p4d) | _KERNPG_TABLE)); | |
64 | } | |
65 | p4d = p4d_offset(pgd, vaddr); | |
66 | if (!p4d_present(*p4d)) { | |
f5deb796 HY |
67 | pud = (pud_t *)get_zeroed_page(GFP_KERNEL); |
68 | if (!pud) | |
69 | goto err; | |
70 | image->arch.pud = pud; | |
7f689041 | 71 | set_p4d(p4d, __p4d(__pa(pud) | _KERNPG_TABLE)); |
f5deb796 | 72 | } |
7f689041 | 73 | pud = pud_offset(p4d, vaddr); |
f5deb796 HY |
74 | if (!pud_present(*pud)) { |
75 | pmd = (pmd_t *)get_zeroed_page(GFP_KERNEL); | |
76 | if (!pmd) | |
77 | goto err; | |
78 | image->arch.pmd = pmd; | |
79 | set_pud(pud, __pud(__pa(pmd) | _KERNPG_TABLE)); | |
80 | } | |
81 | pmd = pmd_offset(pud, vaddr); | |
82 | if (!pmd_present(*pmd)) { | |
83 | pte = (pte_t *)get_zeroed_page(GFP_KERNEL); | |
84 | if (!pte) | |
85 | goto err; | |
86 | image->arch.pte = pte; | |
87 | set_pmd(pmd, __pmd(__pa(pte) | _KERNPG_TABLE)); | |
88 | } | |
89 | pte = pte_offset_kernel(pmd, vaddr); | |
90 | set_pte(pte, pfn_pte(paddr >> PAGE_SHIFT, PAGE_KERNEL_EXEC)); | |
91 | return 0; | |
92 | err: | |
93 | free_transition_pgtable(image); | |
94 | return result; | |
95 | } | |
96 | ||
9ebdc79f YL |
97 | static void *alloc_pgt_page(void *data) |
98 | { | |
99 | struct kimage *image = (struct kimage *)data; | |
100 | struct page *page; | |
101 | void *p = NULL; | |
102 | ||
103 | page = kimage_alloc_control_pages(image, 0); | |
104 | if (page) { | |
105 | p = page_address(page); | |
106 | clear_page(p); | |
107 | } | |
108 | ||
109 | return p; | |
110 | } | |
111 | ||
5234f5eb EB |
112 | static int init_pgtable(struct kimage *image, unsigned long start_pgtable) |
113 | { | |
9ebdc79f YL |
114 | struct x86_mapping_info info = { |
115 | .alloc_pgt_page = alloc_pgt_page, | |
116 | .context = image, | |
66aad4fd | 117 | .page_flag = __PAGE_KERNEL_LARGE_EXEC, |
9ebdc79f | 118 | }; |
084d1283 | 119 | unsigned long mstart, mend; |
8bf27556 | 120 | pgd_t *level4p; |
f5deb796 | 121 | int result; |
084d1283 YL |
122 | int i; |
123 | ||
8bf27556 | 124 | level4p = (pgd_t *)__va(start_pgtable); |
9ebdc79f | 125 | clear_page(level4p); |
8638100c XP |
126 | |
127 | if (direct_gbpages) | |
128 | info.direct_gbpages = true; | |
129 | ||
0e691cf8 YL |
130 | for (i = 0; i < nr_pfn_mapped; i++) { |
131 | mstart = pfn_mapped[i].start << PAGE_SHIFT; | |
132 | mend = pfn_mapped[i].end << PAGE_SHIFT; | |
133 | ||
134 | result = kernel_ident_mapping_init(&info, | |
135 | level4p, mstart, mend); | |
136 | if (result) | |
137 | return result; | |
138 | } | |
084d1283 | 139 | |
53594547 | 140 | /* |
084d1283 YL |
141 | * segments's mem ranges could be outside 0 ~ max_pfn, |
142 | * for example when jump back to original kernel from kexeced kernel. | |
143 | * or first kernel is booted with user mem map, and second kernel | |
144 | * could be loaded out of that range. | |
53594547 | 145 | */ |
084d1283 YL |
146 | for (i = 0; i < image->nr_segments; i++) { |
147 | mstart = image->segment[i].mem; | |
148 | mend = mstart + image->segment[i].memsz; | |
149 | ||
9ebdc79f YL |
150 | result = kernel_ident_mapping_init(&info, |
151 | level4p, mstart, mend); | |
084d1283 YL |
152 | |
153 | if (result) | |
154 | return result; | |
155 | } | |
156 | ||
f5deb796 | 157 | return init_transition_pgtable(image, level4p); |
5234f5eb EB |
158 | } |
159 | ||
160 | static void set_idt(void *newidt, u16 limit) | |
161 | { | |
36c4fd23 | 162 | struct desc_ptr curidt; |
5234f5eb EB |
163 | |
164 | /* x86-64 supports unaliged loads & stores */ | |
36c4fd23 EB |
165 | curidt.size = limit; |
166 | curidt.address = (unsigned long)newidt; | |
5234f5eb EB |
167 | |
168 | __asm__ __volatile__ ( | |
36c4fd23 EB |
169 | "lidtq %0\n" |
170 | : : "m" (curidt) | |
5234f5eb EB |
171 | ); |
172 | }; | |
173 | ||
174 | ||
175 | static void set_gdt(void *newgdt, u16 limit) | |
176 | { | |
36c4fd23 | 177 | struct desc_ptr curgdt; |
5234f5eb EB |
178 | |
179 | /* x86-64 supports unaligned loads & stores */ | |
36c4fd23 EB |
180 | curgdt.size = limit; |
181 | curgdt.address = (unsigned long)newgdt; | |
5234f5eb EB |
182 | |
183 | __asm__ __volatile__ ( | |
36c4fd23 EB |
184 | "lgdtq %0\n" |
185 | : : "m" (curgdt) | |
5234f5eb EB |
186 | ); |
187 | }; | |
188 | ||
189 | static void load_segments(void) | |
190 | { | |
191 | __asm__ __volatile__ ( | |
36c4fd23 EB |
192 | "\tmovl %0,%%ds\n" |
193 | "\tmovl %0,%%es\n" | |
194 | "\tmovl %0,%%ss\n" | |
195 | "\tmovl %0,%%fs\n" | |
196 | "\tmovl %0,%%gs\n" | |
2ec5e3a8 | 197 | : : "a" (__KERNEL_DS) : "memory" |
5234f5eb | 198 | ); |
5234f5eb EB |
199 | } |
200 | ||
74ca317c | 201 | #ifdef CONFIG_KEXEC_FILE |
dd5f7260 VG |
202 | /* Update purgatory as needed after various image segments have been prepared */ |
203 | static int arch_update_purgatory(struct kimage *image) | |
204 | { | |
205 | int ret = 0; | |
206 | ||
207 | if (!image->file_mode) | |
208 | return 0; | |
209 | ||
210 | /* Setup copying of backup region */ | |
211 | if (image->type == KEXEC_TYPE_CRASH) { | |
40c50c1f TG |
212 | ret = kexec_purgatory_get_set_symbol(image, |
213 | "purgatory_backup_dest", | |
dd5f7260 VG |
214 | &image->arch.backup_load_addr, |
215 | sizeof(image->arch.backup_load_addr), 0); | |
216 | if (ret) | |
217 | return ret; | |
218 | ||
40c50c1f TG |
219 | ret = kexec_purgatory_get_set_symbol(image, |
220 | "purgatory_backup_src", | |
dd5f7260 VG |
221 | &image->arch.backup_src_start, |
222 | sizeof(image->arch.backup_src_start), 0); | |
223 | if (ret) | |
224 | return ret; | |
225 | ||
40c50c1f TG |
226 | ret = kexec_purgatory_get_set_symbol(image, |
227 | "purgatory_backup_sz", | |
dd5f7260 VG |
228 | &image->arch.backup_src_sz, |
229 | sizeof(image->arch.backup_src_sz), 0); | |
230 | if (ret) | |
231 | return ret; | |
232 | } | |
233 | ||
234 | return ret; | |
235 | } | |
74ca317c VG |
236 | #else /* !CONFIG_KEXEC_FILE */ |
237 | static inline int arch_update_purgatory(struct kimage *image) | |
238 | { | |
239 | return 0; | |
240 | } | |
241 | #endif /* CONFIG_KEXEC_FILE */ | |
dd5f7260 | 242 | |
5234f5eb EB |
243 | int machine_kexec_prepare(struct kimage *image) |
244 | { | |
4bfaaef0 | 245 | unsigned long start_pgtable; |
5234f5eb EB |
246 | int result; |
247 | ||
248 | /* Calculate the offsets */ | |
72414d3f | 249 | start_pgtable = page_to_pfn(image->control_code_page) << PAGE_SHIFT; |
5234f5eb EB |
250 | |
251 | /* Setup the identity mapped 64bit page table */ | |
252 | result = init_pgtable(image, start_pgtable); | |
72414d3f | 253 | if (result) |
5234f5eb | 254 | return result; |
5234f5eb | 255 | |
dd5f7260 VG |
256 | /* update purgatory as needed */ |
257 | result = arch_update_purgatory(image); | |
258 | if (result) | |
259 | return result; | |
260 | ||
5234f5eb EB |
261 | return 0; |
262 | } | |
263 | ||
264 | void machine_kexec_cleanup(struct kimage *image) | |
265 | { | |
f5deb796 | 266 | free_transition_pgtable(image); |
5234f5eb EB |
267 | } |
268 | ||
269 | /* | |
270 | * Do not allocate memory (or fail in any way) in machine_kexec(). | |
271 | * We are past the point of no return, committed to rebooting now. | |
272 | */ | |
3ab83521 | 273 | void machine_kexec(struct kimage *image) |
5234f5eb | 274 | { |
4bfaaef0 MD |
275 | unsigned long page_list[PAGES_NR]; |
276 | void *control_page; | |
fee7b0d8 | 277 | int save_ftrace_enabled; |
5234f5eb | 278 | |
fee7b0d8 | 279 | #ifdef CONFIG_KEXEC_JUMP |
6407df5c | 280 | if (image->preserve_context) |
fee7b0d8 HY |
281 | save_processor_state(); |
282 | #endif | |
283 | ||
284 | save_ftrace_enabled = __ftrace_enabled_save(); | |
f43fdad8 | 285 | |
5234f5eb EB |
286 | /* Interrupts aren't acceptable while we reboot */ |
287 | local_irq_disable(); | |
17f557e5 | 288 | hw_breakpoint_disable(); |
5234f5eb | 289 | |
fee7b0d8 HY |
290 | if (image->preserve_context) { |
291 | #ifdef CONFIG_X86_IO_APIC | |
292 | /* | |
293 | * We need to put APICs in legacy mode so that we can | |
294 | * get timer interrupts in second kernel. kexec/kdump | |
295 | * paths already have calls to disable_IO_APIC() in | |
296 | * one form or other. kexec jump path also need | |
297 | * one. | |
298 | */ | |
299 | disable_IO_APIC(); | |
300 | #endif | |
301 | } | |
302 | ||
4bfaaef0 | 303 | control_page = page_address(image->control_code_page) + PAGE_SIZE; |
fee7b0d8 | 304 | memcpy(control_page, relocate_kernel, KEXEC_CONTROL_CODE_MAX_SIZE); |
4bfaaef0 | 305 | |
e3ebadd9 | 306 | page_list[PA_CONTROL_PAGE] = virt_to_phys(control_page); |
fee7b0d8 | 307 | page_list[VA_CONTROL_PAGE] = (unsigned long)control_page; |
4bfaaef0 MD |
308 | page_list[PA_TABLE_PAGE] = |
309 | (unsigned long)__pa(page_address(image->control_code_page)); | |
5234f5eb | 310 | |
fee7b0d8 HY |
311 | if (image->type == KEXEC_TYPE_DEFAULT) |
312 | page_list[PA_SWAP_PAGE] = (page_to_pfn(image->swap_page) | |
313 | << PAGE_SHIFT); | |
314 | ||
fef3a7a1 HY |
315 | /* |
316 | * The segment registers are funny things, they have both a | |
2a8a3d5b EB |
317 | * visible and an invisible part. Whenever the visible part is |
318 | * set to a specific selector, the invisible part is loaded | |
319 | * with from a table in memory. At no other time is the | |
320 | * descriptor table in memory accessed. | |
5234f5eb EB |
321 | * |
322 | * I take advantage of this here by force loading the | |
323 | * segments, before I zap the gdt with an invalid value. | |
324 | */ | |
325 | load_segments(); | |
fef3a7a1 HY |
326 | /* |
327 | * The gdt & idt are now invalid. | |
5234f5eb EB |
328 | * If you want to load them you must set up your own idt & gdt. |
329 | */ | |
fef3a7a1 HY |
330 | set_gdt(phys_to_virt(0), 0); |
331 | set_idt(phys_to_virt(0), 0); | |
4bfaaef0 | 332 | |
5234f5eb | 333 | /* now call it */ |
fee7b0d8 HY |
334 | image->start = relocate_kernel((unsigned long)image->head, |
335 | (unsigned long)page_list, | |
336 | image->start, | |
337 | image->preserve_context); | |
338 | ||
339 | #ifdef CONFIG_KEXEC_JUMP | |
6407df5c | 340 | if (image->preserve_context) |
fee7b0d8 HY |
341 | restore_processor_state(); |
342 | #endif | |
343 | ||
344 | __ftrace_enabled_restore(save_ftrace_enabled); | |
5234f5eb | 345 | } |
2c8c0e6b | 346 | |
fd59d231 KO |
347 | void arch_crash_save_vmcoreinfo(void) |
348 | { | |
401721ec | 349 | VMCOREINFO_NUMBER(phys_base); |
65ade2f8 | 350 | VMCOREINFO_SYMBOL(init_top_pgt); |
92df5c3e KO |
351 | |
352 | #ifdef CONFIG_NUMA | |
353 | VMCOREINFO_SYMBOL(node_data); | |
354 | VMCOREINFO_LENGTH(node_data, MAX_NUMNODES); | |
355 | #endif | |
b6085a86 | 356 | vmcoreinfo_append_str("KERNELOFFSET=%lx\n", |
4545c898 | 357 | kaslr_offset()); |
401721ec | 358 | VMCOREINFO_NUMBER(KERNEL_IMAGE_SIZE); |
fd59d231 KO |
359 | } |
360 | ||
cb105258 VG |
361 | /* arch-dependent functionality related to kexec file-based syscall */ |
362 | ||
74ca317c | 363 | #ifdef CONFIG_KEXEC_FILE |
cb105258 VG |
364 | int arch_kexec_kernel_image_probe(struct kimage *image, void *buf, |
365 | unsigned long buf_len) | |
366 | { | |
367 | int i, ret = -ENOEXEC; | |
368 | struct kexec_file_ops *fops; | |
369 | ||
370 | for (i = 0; i < ARRAY_SIZE(kexec_file_loaders); i++) { | |
371 | fops = kexec_file_loaders[i]; | |
372 | if (!fops || !fops->probe) | |
373 | continue; | |
374 | ||
375 | ret = fops->probe(buf, buf_len); | |
376 | if (!ret) { | |
377 | image->fops = fops; | |
378 | return ret; | |
379 | } | |
380 | } | |
381 | ||
382 | return ret; | |
383 | } | |
384 | ||
385 | void *arch_kexec_kernel_image_load(struct kimage *image) | |
386 | { | |
dd5f7260 VG |
387 | vfree(image->arch.elf_headers); |
388 | image->arch.elf_headers = NULL; | |
389 | ||
cb105258 VG |
390 | if (!image->fops || !image->fops->load) |
391 | return ERR_PTR(-ENOEXEC); | |
392 | ||
393 | return image->fops->load(image, image->kernel_buf, | |
394 | image->kernel_buf_len, image->initrd_buf, | |
395 | image->initrd_buf_len, image->cmdline_buf, | |
396 | image->cmdline_buf_len); | |
397 | } | |
398 | ||
399 | int arch_kimage_file_post_load_cleanup(struct kimage *image) | |
400 | { | |
401 | if (!image->fops || !image->fops->cleanup) | |
402 | return 0; | |
403 | ||
27f48d3e | 404 | return image->fops->cleanup(image->image_loader_data); |
cb105258 | 405 | } |
12db5562 | 406 | |
978e30c9 | 407 | #ifdef CONFIG_KEXEC_VERIFY_SIG |
8e7d8381 VG |
408 | int arch_kexec_kernel_verify_sig(struct kimage *image, void *kernel, |
409 | unsigned long kernel_len) | |
410 | { | |
411 | if (!image->fops || !image->fops->verify_sig) { | |
412 | pr_debug("kernel loader does not support signature verification."); | |
413 | return -EKEYREJECTED; | |
414 | } | |
415 | ||
416 | return image->fops->verify_sig(kernel, kernel_len); | |
417 | } | |
978e30c9 | 418 | #endif |
8e7d8381 | 419 | |
12db5562 VG |
420 | /* |
421 | * Apply purgatory relocations. | |
422 | * | |
423 | * ehdr: Pointer to elf headers | |
424 | * sechdrs: Pointer to section headers. | |
425 | * relsec: section index of SHT_RELA section. | |
426 | * | |
427 | * TODO: Some of the code belongs to generic code. Move that in kexec.c. | |
428 | */ | |
429 | int arch_kexec_apply_relocations_add(const Elf64_Ehdr *ehdr, | |
430 | Elf64_Shdr *sechdrs, unsigned int relsec) | |
431 | { | |
432 | unsigned int i; | |
433 | Elf64_Rela *rel; | |
434 | Elf64_Sym *sym; | |
435 | void *location; | |
436 | Elf64_Shdr *section, *symtabsec; | |
437 | unsigned long address, sec_base, value; | |
438 | const char *strtab, *name, *shstrtab; | |
439 | ||
440 | /* | |
441 | * ->sh_offset has been modified to keep the pointer to section | |
442 | * contents in memory | |
443 | */ | |
444 | rel = (void *)sechdrs[relsec].sh_offset; | |
445 | ||
446 | /* Section to which relocations apply */ | |
447 | section = &sechdrs[sechdrs[relsec].sh_info]; | |
448 | ||
449 | pr_debug("Applying relocate section %u to %u\n", relsec, | |
450 | sechdrs[relsec].sh_info); | |
451 | ||
452 | /* Associated symbol table */ | |
453 | symtabsec = &sechdrs[sechdrs[relsec].sh_link]; | |
454 | ||
455 | /* String table */ | |
456 | if (symtabsec->sh_link >= ehdr->e_shnum) { | |
457 | /* Invalid strtab section number */ | |
458 | pr_err("Invalid string table section index %d\n", | |
459 | symtabsec->sh_link); | |
460 | return -ENOEXEC; | |
461 | } | |
462 | ||
463 | strtab = (char *)sechdrs[symtabsec->sh_link].sh_offset; | |
464 | ||
465 | /* section header string table */ | |
466 | shstrtab = (char *)sechdrs[ehdr->e_shstrndx].sh_offset; | |
467 | ||
468 | for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) { | |
469 | ||
470 | /* | |
471 | * rel[i].r_offset contains byte offset from beginning | |
472 | * of section to the storage unit affected. | |
473 | * | |
474 | * This is location to update (->sh_offset). This is temporary | |
475 | * buffer where section is currently loaded. This will finally | |
476 | * be loaded to a different address later, pointed to by | |
477 | * ->sh_addr. kexec takes care of moving it | |
478 | * (kexec_load_segment()). | |
479 | */ | |
480 | location = (void *)(section->sh_offset + rel[i].r_offset); | |
481 | ||
482 | /* Final address of the location */ | |
483 | address = section->sh_addr + rel[i].r_offset; | |
484 | ||
485 | /* | |
486 | * rel[i].r_info contains information about symbol table index | |
487 | * w.r.t which relocation must be made and type of relocation | |
488 | * to apply. ELF64_R_SYM() and ELF64_R_TYPE() macros get | |
489 | * these respectively. | |
490 | */ | |
491 | sym = (Elf64_Sym *)symtabsec->sh_offset + | |
492 | ELF64_R_SYM(rel[i].r_info); | |
493 | ||
494 | if (sym->st_name) | |
495 | name = strtab + sym->st_name; | |
496 | else | |
497 | name = shstrtab + sechdrs[sym->st_shndx].sh_name; | |
498 | ||
499 | pr_debug("Symbol: %s info: %02x shndx: %02x value=%llx size: %llx\n", | |
500 | name, sym->st_info, sym->st_shndx, sym->st_value, | |
501 | sym->st_size); | |
502 | ||
503 | if (sym->st_shndx == SHN_UNDEF) { | |
504 | pr_err("Undefined symbol: %s\n", name); | |
505 | return -ENOEXEC; | |
506 | } | |
507 | ||
508 | if (sym->st_shndx == SHN_COMMON) { | |
509 | pr_err("symbol '%s' in common section\n", name); | |
510 | return -ENOEXEC; | |
511 | } | |
512 | ||
513 | if (sym->st_shndx == SHN_ABS) | |
514 | sec_base = 0; | |
515 | else if (sym->st_shndx >= ehdr->e_shnum) { | |
516 | pr_err("Invalid section %d for symbol %s\n", | |
517 | sym->st_shndx, name); | |
518 | return -ENOEXEC; | |
519 | } else | |
520 | sec_base = sechdrs[sym->st_shndx].sh_addr; | |
521 | ||
522 | value = sym->st_value; | |
523 | value += sec_base; | |
524 | value += rel[i].r_addend; | |
525 | ||
526 | switch (ELF64_R_TYPE(rel[i].r_info)) { | |
527 | case R_X86_64_NONE: | |
528 | break; | |
529 | case R_X86_64_64: | |
530 | *(u64 *)location = value; | |
531 | break; | |
532 | case R_X86_64_32: | |
533 | *(u32 *)location = value; | |
534 | if (value != *(u32 *)location) | |
535 | goto overflow; | |
536 | break; | |
537 | case R_X86_64_32S: | |
538 | *(s32 *)location = value; | |
539 | if ((s64)value != *(s32 *)location) | |
540 | goto overflow; | |
541 | break; | |
542 | case R_X86_64_PC32: | |
543 | value -= (u64)address; | |
544 | *(u32 *)location = value; | |
545 | break; | |
546 | default: | |
547 | pr_err("Unknown rela relocation: %llu\n", | |
548 | ELF64_R_TYPE(rel[i].r_info)); | |
549 | return -ENOEXEC; | |
550 | } | |
551 | } | |
552 | return 0; | |
553 | ||
554 | overflow: | |
555 | pr_err("Overflow in relocation type %d value 0x%lx\n", | |
556 | (int)ELF64_R_TYPE(rel[i].r_info), value); | |
557 | return -ENOEXEC; | |
558 | } | |
74ca317c | 559 | #endif /* CONFIG_KEXEC_FILE */ |
1e5768ae XP |
560 | |
561 | static int | |
562 | kexec_mark_range(unsigned long start, unsigned long end, bool protect) | |
563 | { | |
564 | struct page *page; | |
565 | unsigned int nr_pages; | |
566 | ||
567 | /* | |
568 | * For physical range: [start, end]. We must skip the unassigned | |
569 | * crashk resource with zero-valued "end" member. | |
570 | */ | |
571 | if (!end || start > end) | |
572 | return 0; | |
573 | ||
574 | page = pfn_to_page(start >> PAGE_SHIFT); | |
575 | nr_pages = (end >> PAGE_SHIFT) - (start >> PAGE_SHIFT) + 1; | |
576 | if (protect) | |
577 | return set_pages_ro(page, nr_pages); | |
578 | else | |
579 | return set_pages_rw(page, nr_pages); | |
580 | } | |
581 | ||
582 | static void kexec_mark_crashkres(bool protect) | |
583 | { | |
584 | unsigned long control; | |
585 | ||
586 | kexec_mark_range(crashk_low_res.start, crashk_low_res.end, protect); | |
587 | ||
588 | /* Don't touch the control code page used in crash_kexec().*/ | |
589 | control = PFN_PHYS(page_to_pfn(kexec_crash_image->control_code_page)); | |
590 | /* Control code page is located in the 2nd page. */ | |
591 | kexec_mark_range(crashk_res.start, control + PAGE_SIZE - 1, protect); | |
592 | control += KEXEC_CONTROL_PAGE_SIZE; | |
593 | kexec_mark_range(control, crashk_res.end, protect); | |
594 | } | |
595 | ||
596 | void arch_kexec_protect_crashkres(void) | |
597 | { | |
598 | kexec_mark_crashkres(true); | |
599 | } | |
600 | ||
601 | void arch_kexec_unprotect_crashkres(void) | |
602 | { | |
603 | kexec_mark_crashkres(false); | |
604 | } |