Commit | Line | Data |
---|---|---|
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> |
8bf27556 | 30 | |
74ca317c | 31 | #ifdef CONFIG_KEXEC_FILE |
cb105258 | 32 | static struct kexec_file_ops *kexec_file_loaders[] = { |
27f48d3e | 33 | &kexec_bzImage64_ops, |
cb105258 | 34 | }; |
74ca317c | 35 | #endif |
cb105258 | 36 | |
f5deb796 HY |
37 | static void free_transition_pgtable(struct kimage *image) |
38 | { | |
7f689041 | 39 | free_page((unsigned long)image->arch.p4d); |
f5deb796 HY |
40 | free_page((unsigned long)image->arch.pud); |
41 | free_page((unsigned long)image->arch.pmd); | |
42 | free_page((unsigned long)image->arch.pte); | |
43 | } | |
44 | ||
45 | static int init_transition_pgtable(struct kimage *image, pgd_t *pgd) | |
46 | { | |
7f689041 | 47 | p4d_t *p4d; |
f5deb796 HY |
48 | pud_t *pud; |
49 | pmd_t *pmd; | |
50 | pte_t *pte; | |
51 | unsigned long vaddr, paddr; | |
52 | int result = -ENOMEM; | |
53 | ||
54 | vaddr = (unsigned long)relocate_kernel; | |
55 | paddr = __pa(page_address(image->control_code_page)+PAGE_SIZE); | |
56 | pgd += pgd_index(vaddr); | |
57 | if (!pgd_present(*pgd)) { | |
7f689041 KS |
58 | p4d = (p4d_t *)get_zeroed_page(GFP_KERNEL); |
59 | if (!p4d) | |
60 | goto err; | |
61 | image->arch.p4d = p4d; | |
62 | set_pgd(pgd, __pgd(__pa(p4d) | _KERNPG_TABLE)); | |
63 | } | |
64 | p4d = p4d_offset(pgd, vaddr); | |
65 | if (!p4d_present(*p4d)) { | |
f5deb796 HY |
66 | pud = (pud_t *)get_zeroed_page(GFP_KERNEL); |
67 | if (!pud) | |
68 | goto err; | |
69 | image->arch.pud = pud; | |
7f689041 | 70 | set_p4d(p4d, __p4d(__pa(pud) | _KERNPG_TABLE)); |
f5deb796 | 71 | } |
7f689041 | 72 | pud = pud_offset(p4d, vaddr); |
f5deb796 HY |
73 | if (!pud_present(*pud)) { |
74 | pmd = (pmd_t *)get_zeroed_page(GFP_KERNEL); | |
75 | if (!pmd) | |
76 | goto err; | |
77 | image->arch.pmd = pmd; | |
78 | set_pud(pud, __pud(__pa(pmd) | _KERNPG_TABLE)); | |
79 | } | |
80 | pmd = pmd_offset(pud, vaddr); | |
81 | if (!pmd_present(*pmd)) { | |
82 | pte = (pte_t *)get_zeroed_page(GFP_KERNEL); | |
83 | if (!pte) | |
84 | goto err; | |
85 | image->arch.pte = pte; | |
86 | set_pmd(pmd, __pmd(__pa(pte) | _KERNPG_TABLE)); | |
87 | } | |
88 | pte = pte_offset_kernel(pmd, vaddr); | |
89 | set_pte(pte, pfn_pte(paddr >> PAGE_SHIFT, PAGE_KERNEL_EXEC)); | |
90 | return 0; | |
91 | err: | |
92 | free_transition_pgtable(image); | |
93 | return result; | |
94 | } | |
95 | ||
9ebdc79f YL |
96 | static void *alloc_pgt_page(void *data) |
97 | { | |
98 | struct kimage *image = (struct kimage *)data; | |
99 | struct page *page; | |
100 | void *p = NULL; | |
101 | ||
102 | page = kimage_alloc_control_pages(image, 0); | |
103 | if (page) { | |
104 | p = page_address(page); | |
105 | clear_page(p); | |
106 | } | |
107 | ||
108 | return p; | |
109 | } | |
110 | ||
5234f5eb EB |
111 | static int init_pgtable(struct kimage *image, unsigned long start_pgtable) |
112 | { | |
9ebdc79f YL |
113 | struct x86_mapping_info info = { |
114 | .alloc_pgt_page = alloc_pgt_page, | |
115 | .context = image, | |
116 | .pmd_flag = __PAGE_KERNEL_LARGE_EXEC, | |
117 | }; | |
084d1283 | 118 | unsigned long mstart, mend; |
8bf27556 | 119 | pgd_t *level4p; |
f5deb796 | 120 | int result; |
084d1283 YL |
121 | int i; |
122 | ||
8bf27556 | 123 | level4p = (pgd_t *)__va(start_pgtable); |
9ebdc79f | 124 | clear_page(level4p); |
0e691cf8 YL |
125 | for (i = 0; i < nr_pfn_mapped; i++) { |
126 | mstart = pfn_mapped[i].start << PAGE_SHIFT; | |
127 | mend = pfn_mapped[i].end << PAGE_SHIFT; | |
128 | ||
129 | result = kernel_ident_mapping_init(&info, | |
130 | level4p, mstart, mend); | |
131 | if (result) | |
132 | return result; | |
133 | } | |
084d1283 | 134 | |
53594547 | 135 | /* |
084d1283 YL |
136 | * segments's mem ranges could be outside 0 ~ max_pfn, |
137 | * for example when jump back to original kernel from kexeced kernel. | |
138 | * or first kernel is booted with user mem map, and second kernel | |
139 | * could be loaded out of that range. | |
53594547 | 140 | */ |
084d1283 YL |
141 | for (i = 0; i < image->nr_segments; i++) { |
142 | mstart = image->segment[i].mem; | |
143 | mend = mstart + image->segment[i].memsz; | |
144 | ||
9ebdc79f YL |
145 | result = kernel_ident_mapping_init(&info, |
146 | level4p, mstart, mend); | |
084d1283 YL |
147 | |
148 | if (result) | |
149 | return result; | |
150 | } | |
151 | ||
f5deb796 | 152 | return init_transition_pgtable(image, level4p); |
5234f5eb EB |
153 | } |
154 | ||
155 | static void set_idt(void *newidt, u16 limit) | |
156 | { | |
36c4fd23 | 157 | struct desc_ptr curidt; |
5234f5eb EB |
158 | |
159 | /* x86-64 supports unaliged loads & stores */ | |
36c4fd23 EB |
160 | curidt.size = limit; |
161 | curidt.address = (unsigned long)newidt; | |
5234f5eb EB |
162 | |
163 | __asm__ __volatile__ ( | |
36c4fd23 EB |
164 | "lidtq %0\n" |
165 | : : "m" (curidt) | |
5234f5eb EB |
166 | ); |
167 | }; | |
168 | ||
169 | ||
170 | static void set_gdt(void *newgdt, u16 limit) | |
171 | { | |
36c4fd23 | 172 | struct desc_ptr curgdt; |
5234f5eb EB |
173 | |
174 | /* x86-64 supports unaligned loads & stores */ | |
36c4fd23 EB |
175 | curgdt.size = limit; |
176 | curgdt.address = (unsigned long)newgdt; | |
5234f5eb EB |
177 | |
178 | __asm__ __volatile__ ( | |
36c4fd23 EB |
179 | "lgdtq %0\n" |
180 | : : "m" (curgdt) | |
5234f5eb EB |
181 | ); |
182 | }; | |
183 | ||
184 | static void load_segments(void) | |
185 | { | |
186 | __asm__ __volatile__ ( | |
36c4fd23 EB |
187 | "\tmovl %0,%%ds\n" |
188 | "\tmovl %0,%%es\n" | |
189 | "\tmovl %0,%%ss\n" | |
190 | "\tmovl %0,%%fs\n" | |
191 | "\tmovl %0,%%gs\n" | |
2ec5e3a8 | 192 | : : "a" (__KERNEL_DS) : "memory" |
5234f5eb | 193 | ); |
5234f5eb EB |
194 | } |
195 | ||
74ca317c | 196 | #ifdef CONFIG_KEXEC_FILE |
dd5f7260 VG |
197 | /* Update purgatory as needed after various image segments have been prepared */ |
198 | static int arch_update_purgatory(struct kimage *image) | |
199 | { | |
200 | int ret = 0; | |
201 | ||
202 | if (!image->file_mode) | |
203 | return 0; | |
204 | ||
205 | /* Setup copying of backup region */ | |
206 | if (image->type == KEXEC_TYPE_CRASH) { | |
40c50c1f TG |
207 | ret = kexec_purgatory_get_set_symbol(image, |
208 | "purgatory_backup_dest", | |
dd5f7260 VG |
209 | &image->arch.backup_load_addr, |
210 | sizeof(image->arch.backup_load_addr), 0); | |
211 | if (ret) | |
212 | return ret; | |
213 | ||
40c50c1f TG |
214 | ret = kexec_purgatory_get_set_symbol(image, |
215 | "purgatory_backup_src", | |
dd5f7260 VG |
216 | &image->arch.backup_src_start, |
217 | sizeof(image->arch.backup_src_start), 0); | |
218 | if (ret) | |
219 | return ret; | |
220 | ||
40c50c1f TG |
221 | ret = kexec_purgatory_get_set_symbol(image, |
222 | "purgatory_backup_sz", | |
dd5f7260 VG |
223 | &image->arch.backup_src_sz, |
224 | sizeof(image->arch.backup_src_sz), 0); | |
225 | if (ret) | |
226 | return ret; | |
227 | } | |
228 | ||
229 | return ret; | |
230 | } | |
74ca317c VG |
231 | #else /* !CONFIG_KEXEC_FILE */ |
232 | static inline int arch_update_purgatory(struct kimage *image) | |
233 | { | |
234 | return 0; | |
235 | } | |
236 | #endif /* CONFIG_KEXEC_FILE */ | |
dd5f7260 | 237 | |
5234f5eb EB |
238 | int machine_kexec_prepare(struct kimage *image) |
239 | { | |
4bfaaef0 | 240 | unsigned long start_pgtable; |
5234f5eb EB |
241 | int result; |
242 | ||
243 | /* Calculate the offsets */ | |
72414d3f | 244 | start_pgtable = page_to_pfn(image->control_code_page) << PAGE_SHIFT; |
5234f5eb EB |
245 | |
246 | /* Setup the identity mapped 64bit page table */ | |
247 | result = init_pgtable(image, start_pgtable); | |
72414d3f | 248 | if (result) |
5234f5eb | 249 | return result; |
5234f5eb | 250 | |
dd5f7260 VG |
251 | /* update purgatory as needed */ |
252 | result = arch_update_purgatory(image); | |
253 | if (result) | |
254 | return result; | |
255 | ||
5234f5eb EB |
256 | return 0; |
257 | } | |
258 | ||
259 | void machine_kexec_cleanup(struct kimage *image) | |
260 | { | |
f5deb796 | 261 | free_transition_pgtable(image); |
5234f5eb EB |
262 | } |
263 | ||
264 | /* | |
265 | * Do not allocate memory (or fail in any way) in machine_kexec(). | |
266 | * We are past the point of no return, committed to rebooting now. | |
267 | */ | |
3ab83521 | 268 | void machine_kexec(struct kimage *image) |
5234f5eb | 269 | { |
4bfaaef0 MD |
270 | unsigned long page_list[PAGES_NR]; |
271 | void *control_page; | |
fee7b0d8 | 272 | int save_ftrace_enabled; |
5234f5eb | 273 | |
fee7b0d8 | 274 | #ifdef CONFIG_KEXEC_JUMP |
6407df5c | 275 | if (image->preserve_context) |
fee7b0d8 HY |
276 | save_processor_state(); |
277 | #endif | |
278 | ||
279 | save_ftrace_enabled = __ftrace_enabled_save(); | |
f43fdad8 | 280 | |
5234f5eb EB |
281 | /* Interrupts aren't acceptable while we reboot */ |
282 | local_irq_disable(); | |
17f557e5 | 283 | hw_breakpoint_disable(); |
5234f5eb | 284 | |
fee7b0d8 HY |
285 | if (image->preserve_context) { |
286 | #ifdef CONFIG_X86_IO_APIC | |
287 | /* | |
288 | * We need to put APICs in legacy mode so that we can | |
289 | * get timer interrupts in second kernel. kexec/kdump | |
290 | * paths already have calls to disable_IO_APIC() in | |
291 | * one form or other. kexec jump path also need | |
292 | * one. | |
293 | */ | |
294 | disable_IO_APIC(); | |
295 | #endif | |
296 | } | |
297 | ||
4bfaaef0 | 298 | control_page = page_address(image->control_code_page) + PAGE_SIZE; |
fee7b0d8 | 299 | memcpy(control_page, relocate_kernel, KEXEC_CONTROL_CODE_MAX_SIZE); |
4bfaaef0 | 300 | |
e3ebadd9 | 301 | page_list[PA_CONTROL_PAGE] = virt_to_phys(control_page); |
fee7b0d8 | 302 | page_list[VA_CONTROL_PAGE] = (unsigned long)control_page; |
4bfaaef0 MD |
303 | page_list[PA_TABLE_PAGE] = |
304 | (unsigned long)__pa(page_address(image->control_code_page)); | |
5234f5eb | 305 | |
fee7b0d8 HY |
306 | if (image->type == KEXEC_TYPE_DEFAULT) |
307 | page_list[PA_SWAP_PAGE] = (page_to_pfn(image->swap_page) | |
308 | << PAGE_SHIFT); | |
309 | ||
fef3a7a1 HY |
310 | /* |
311 | * The segment registers are funny things, they have both a | |
2a8a3d5b EB |
312 | * visible and an invisible part. Whenever the visible part is |
313 | * set to a specific selector, the invisible part is loaded | |
314 | * with from a table in memory. At no other time is the | |
315 | * descriptor table in memory accessed. | |
5234f5eb EB |
316 | * |
317 | * I take advantage of this here by force loading the | |
318 | * segments, before I zap the gdt with an invalid value. | |
319 | */ | |
320 | load_segments(); | |
fef3a7a1 HY |
321 | /* |
322 | * The gdt & idt are now invalid. | |
5234f5eb EB |
323 | * If you want to load them you must set up your own idt & gdt. |
324 | */ | |
fef3a7a1 HY |
325 | set_gdt(phys_to_virt(0), 0); |
326 | set_idt(phys_to_virt(0), 0); | |
4bfaaef0 | 327 | |
5234f5eb | 328 | /* now call it */ |
fee7b0d8 HY |
329 | image->start = relocate_kernel((unsigned long)image->head, |
330 | (unsigned long)page_list, | |
331 | image->start, | |
332 | image->preserve_context); | |
333 | ||
334 | #ifdef CONFIG_KEXEC_JUMP | |
6407df5c | 335 | if (image->preserve_context) |
fee7b0d8 HY |
336 | restore_processor_state(); |
337 | #endif | |
338 | ||
339 | __ftrace_enabled_restore(save_ftrace_enabled); | |
5234f5eb | 340 | } |
2c8c0e6b | 341 | |
fd59d231 KO |
342 | void arch_crash_save_vmcoreinfo(void) |
343 | { | |
401721ec | 344 | VMCOREINFO_NUMBER(phys_base); |
69243f91 | 345 | VMCOREINFO_SYMBOL(init_level4_pgt); |
92df5c3e KO |
346 | |
347 | #ifdef CONFIG_NUMA | |
348 | VMCOREINFO_SYMBOL(node_data); | |
349 | VMCOREINFO_LENGTH(node_data, MAX_NUMNODES); | |
350 | #endif | |
b6085a86 | 351 | vmcoreinfo_append_str("KERNELOFFSET=%lx\n", |
4545c898 | 352 | kaslr_offset()); |
401721ec | 353 | VMCOREINFO_NUMBER(KERNEL_IMAGE_SIZE); |
fd59d231 KO |
354 | } |
355 | ||
cb105258 VG |
356 | /* arch-dependent functionality related to kexec file-based syscall */ |
357 | ||
74ca317c | 358 | #ifdef CONFIG_KEXEC_FILE |
cb105258 VG |
359 | int arch_kexec_kernel_image_probe(struct kimage *image, void *buf, |
360 | unsigned long buf_len) | |
361 | { | |
362 | int i, ret = -ENOEXEC; | |
363 | struct kexec_file_ops *fops; | |
364 | ||
365 | for (i = 0; i < ARRAY_SIZE(kexec_file_loaders); i++) { | |
366 | fops = kexec_file_loaders[i]; | |
367 | if (!fops || !fops->probe) | |
368 | continue; | |
369 | ||
370 | ret = fops->probe(buf, buf_len); | |
371 | if (!ret) { | |
372 | image->fops = fops; | |
373 | return ret; | |
374 | } | |
375 | } | |
376 | ||
377 | return ret; | |
378 | } | |
379 | ||
380 | void *arch_kexec_kernel_image_load(struct kimage *image) | |
381 | { | |
dd5f7260 VG |
382 | vfree(image->arch.elf_headers); |
383 | image->arch.elf_headers = NULL; | |
384 | ||
cb105258 VG |
385 | if (!image->fops || !image->fops->load) |
386 | return ERR_PTR(-ENOEXEC); | |
387 | ||
388 | return image->fops->load(image, image->kernel_buf, | |
389 | image->kernel_buf_len, image->initrd_buf, | |
390 | image->initrd_buf_len, image->cmdline_buf, | |
391 | image->cmdline_buf_len); | |
392 | } | |
393 | ||
394 | int arch_kimage_file_post_load_cleanup(struct kimage *image) | |
395 | { | |
396 | if (!image->fops || !image->fops->cleanup) | |
397 | return 0; | |
398 | ||
27f48d3e | 399 | return image->fops->cleanup(image->image_loader_data); |
cb105258 | 400 | } |
12db5562 | 401 | |
978e30c9 | 402 | #ifdef CONFIG_KEXEC_VERIFY_SIG |
8e7d8381 VG |
403 | int arch_kexec_kernel_verify_sig(struct kimage *image, void *kernel, |
404 | unsigned long kernel_len) | |
405 | { | |
406 | if (!image->fops || !image->fops->verify_sig) { | |
407 | pr_debug("kernel loader does not support signature verification."); | |
408 | return -EKEYREJECTED; | |
409 | } | |
410 | ||
411 | return image->fops->verify_sig(kernel, kernel_len); | |
412 | } | |
978e30c9 | 413 | #endif |
8e7d8381 | 414 | |
12db5562 VG |
415 | /* |
416 | * Apply purgatory relocations. | |
417 | * | |
418 | * ehdr: Pointer to elf headers | |
419 | * sechdrs: Pointer to section headers. | |
420 | * relsec: section index of SHT_RELA section. | |
421 | * | |
422 | * TODO: Some of the code belongs to generic code. Move that in kexec.c. | |
423 | */ | |
424 | int arch_kexec_apply_relocations_add(const Elf64_Ehdr *ehdr, | |
425 | Elf64_Shdr *sechdrs, unsigned int relsec) | |
426 | { | |
427 | unsigned int i; | |
428 | Elf64_Rela *rel; | |
429 | Elf64_Sym *sym; | |
430 | void *location; | |
431 | Elf64_Shdr *section, *symtabsec; | |
432 | unsigned long address, sec_base, value; | |
433 | const char *strtab, *name, *shstrtab; | |
434 | ||
435 | /* | |
436 | * ->sh_offset has been modified to keep the pointer to section | |
437 | * contents in memory | |
438 | */ | |
439 | rel = (void *)sechdrs[relsec].sh_offset; | |
440 | ||
441 | /* Section to which relocations apply */ | |
442 | section = &sechdrs[sechdrs[relsec].sh_info]; | |
443 | ||
444 | pr_debug("Applying relocate section %u to %u\n", relsec, | |
445 | sechdrs[relsec].sh_info); | |
446 | ||
447 | /* Associated symbol table */ | |
448 | symtabsec = &sechdrs[sechdrs[relsec].sh_link]; | |
449 | ||
450 | /* String table */ | |
451 | if (symtabsec->sh_link >= ehdr->e_shnum) { | |
452 | /* Invalid strtab section number */ | |
453 | pr_err("Invalid string table section index %d\n", | |
454 | symtabsec->sh_link); | |
455 | return -ENOEXEC; | |
456 | } | |
457 | ||
458 | strtab = (char *)sechdrs[symtabsec->sh_link].sh_offset; | |
459 | ||
460 | /* section header string table */ | |
461 | shstrtab = (char *)sechdrs[ehdr->e_shstrndx].sh_offset; | |
462 | ||
463 | for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) { | |
464 | ||
465 | /* | |
466 | * rel[i].r_offset contains byte offset from beginning | |
467 | * of section to the storage unit affected. | |
468 | * | |
469 | * This is location to update (->sh_offset). This is temporary | |
470 | * buffer where section is currently loaded. This will finally | |
471 | * be loaded to a different address later, pointed to by | |
472 | * ->sh_addr. kexec takes care of moving it | |
473 | * (kexec_load_segment()). | |
474 | */ | |
475 | location = (void *)(section->sh_offset + rel[i].r_offset); | |
476 | ||
477 | /* Final address of the location */ | |
478 | address = section->sh_addr + rel[i].r_offset; | |
479 | ||
480 | /* | |
481 | * rel[i].r_info contains information about symbol table index | |
482 | * w.r.t which relocation must be made and type of relocation | |
483 | * to apply. ELF64_R_SYM() and ELF64_R_TYPE() macros get | |
484 | * these respectively. | |
485 | */ | |
486 | sym = (Elf64_Sym *)symtabsec->sh_offset + | |
487 | ELF64_R_SYM(rel[i].r_info); | |
488 | ||
489 | if (sym->st_name) | |
490 | name = strtab + sym->st_name; | |
491 | else | |
492 | name = shstrtab + sechdrs[sym->st_shndx].sh_name; | |
493 | ||
494 | pr_debug("Symbol: %s info: %02x shndx: %02x value=%llx size: %llx\n", | |
495 | name, sym->st_info, sym->st_shndx, sym->st_value, | |
496 | sym->st_size); | |
497 | ||
498 | if (sym->st_shndx == SHN_UNDEF) { | |
499 | pr_err("Undefined symbol: %s\n", name); | |
500 | return -ENOEXEC; | |
501 | } | |
502 | ||
503 | if (sym->st_shndx == SHN_COMMON) { | |
504 | pr_err("symbol '%s' in common section\n", name); | |
505 | return -ENOEXEC; | |
506 | } | |
507 | ||
508 | if (sym->st_shndx == SHN_ABS) | |
509 | sec_base = 0; | |
510 | else if (sym->st_shndx >= ehdr->e_shnum) { | |
511 | pr_err("Invalid section %d for symbol %s\n", | |
512 | sym->st_shndx, name); | |
513 | return -ENOEXEC; | |
514 | } else | |
515 | sec_base = sechdrs[sym->st_shndx].sh_addr; | |
516 | ||
517 | value = sym->st_value; | |
518 | value += sec_base; | |
519 | value += rel[i].r_addend; | |
520 | ||
521 | switch (ELF64_R_TYPE(rel[i].r_info)) { | |
522 | case R_X86_64_NONE: | |
523 | break; | |
524 | case R_X86_64_64: | |
525 | *(u64 *)location = value; | |
526 | break; | |
527 | case R_X86_64_32: | |
528 | *(u32 *)location = value; | |
529 | if (value != *(u32 *)location) | |
530 | goto overflow; | |
531 | break; | |
532 | case R_X86_64_32S: | |
533 | *(s32 *)location = value; | |
534 | if ((s64)value != *(s32 *)location) | |
535 | goto overflow; | |
536 | break; | |
537 | case R_X86_64_PC32: | |
538 | value -= (u64)address; | |
539 | *(u32 *)location = value; | |
540 | break; | |
541 | default: | |
542 | pr_err("Unknown rela relocation: %llu\n", | |
543 | ELF64_R_TYPE(rel[i].r_info)); | |
544 | return -ENOEXEC; | |
545 | } | |
546 | } | |
547 | return 0; | |
548 | ||
549 | overflow: | |
550 | pr_err("Overflow in relocation type %d value 0x%lx\n", | |
551 | (int)ELF64_R_TYPE(rel[i].r_info), value); | |
552 | return -ENOEXEC; | |
553 | } | |
74ca317c | 554 | #endif /* CONFIG_KEXEC_FILE */ |
1e5768ae XP |
555 | |
556 | static int | |
557 | kexec_mark_range(unsigned long start, unsigned long end, bool protect) | |
558 | { | |
559 | struct page *page; | |
560 | unsigned int nr_pages; | |
561 | ||
562 | /* | |
563 | * For physical range: [start, end]. We must skip the unassigned | |
564 | * crashk resource with zero-valued "end" member. | |
565 | */ | |
566 | if (!end || start > end) | |
567 | return 0; | |
568 | ||
569 | page = pfn_to_page(start >> PAGE_SHIFT); | |
570 | nr_pages = (end >> PAGE_SHIFT) - (start >> PAGE_SHIFT) + 1; | |
571 | if (protect) | |
572 | return set_pages_ro(page, nr_pages); | |
573 | else | |
574 | return set_pages_rw(page, nr_pages); | |
575 | } | |
576 | ||
577 | static void kexec_mark_crashkres(bool protect) | |
578 | { | |
579 | unsigned long control; | |
580 | ||
581 | kexec_mark_range(crashk_low_res.start, crashk_low_res.end, protect); | |
582 | ||
583 | /* Don't touch the control code page used in crash_kexec().*/ | |
584 | control = PFN_PHYS(page_to_pfn(kexec_crash_image->control_code_page)); | |
585 | /* Control code page is located in the 2nd page. */ | |
586 | kexec_mark_range(crashk_res.start, control + PAGE_SIZE - 1, protect); | |
587 | control += KEXEC_CONTROL_PAGE_SIZE; | |
588 | kexec_mark_range(control, crashk_res.end, protect); | |
589 | } | |
590 | ||
591 | void arch_kexec_protect_crashkres(void) | |
592 | { | |
593 | kexec_mark_crashkres(true); | |
594 | } | |
595 | ||
596 | void arch_kexec_unprotect_crashkres(void) | |
597 | { | |
598 | kexec_mark_crashkres(false); | |
599 | } |