1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef LINUX_KEXEC_H
3 #define LINUX_KEXEC_H
4
5 #define IND_DESTINATION_BIT 0
6 #define IND_INDIRECTION_BIT 1
7 #define IND_DONE_BIT 2
8 #define IND_SOURCE_BIT 3
9
10 #define IND_DESTINATION (1 << IND_DESTINATION_BIT)
11 #define IND_INDIRECTION (1 << IND_INDIRECTION_BIT)
12 #define IND_DONE (1 << IND_DONE_BIT)
13 #define IND_SOURCE (1 << IND_SOURCE_BIT)
14 #define IND_FLAGS (IND_DESTINATION | IND_INDIRECTION | IND_DONE | IND_SOURCE)
15
16 #if !defined(__ASSEMBLY__)
17
18 #include <linux/vmcore_info.h>
19 #include <linux/crash_reserve.h>
20 #include <asm/io.h>
21 #include <linux/range.h>
22
23 #include <uapi/linux/kexec.h>
24 #include <linux/verification.h>
25
26 extern note_buf_t __percpu *crash_notes;
27
28 #ifdef CONFIG_KEXEC_CORE
29 #include <linux/list.h>
30 #include <linux/compat.h>
31 #include <linux/ioport.h>
32 #include <linux/module.h>
33 #include <linux/highmem.h>
34 #include <asm/kexec.h>
35 #include <linux/crash_core.h>
36
37 /* Verify architecture specific macros are defined */
38
39 #ifndef KEXEC_SOURCE_MEMORY_LIMIT
40 #error KEXEC_SOURCE_MEMORY_LIMIT not defined
41 #endif
42
43 #ifndef KEXEC_DESTINATION_MEMORY_LIMIT
44 #error KEXEC_DESTINATION_MEMORY_LIMIT not defined
45 #endif
46
47 #ifndef KEXEC_CONTROL_MEMORY_LIMIT
48 #error KEXEC_CONTROL_MEMORY_LIMIT not defined
49 #endif
50
51 #ifndef KEXEC_CONTROL_MEMORY_GFP
52 #define KEXEC_CONTROL_MEMORY_GFP (GFP_KERNEL | __GFP_NORETRY)
53 #endif
54
55 #ifndef KEXEC_CONTROL_PAGE_SIZE
56 #error KEXEC_CONTROL_PAGE_SIZE not defined
57 #endif
58
59 #ifndef KEXEC_ARCH
60 #error KEXEC_ARCH not defined
61 #endif
62
63 #ifndef KEXEC_CRASH_CONTROL_MEMORY_LIMIT
64 #define KEXEC_CRASH_CONTROL_MEMORY_LIMIT KEXEC_CONTROL_MEMORY_LIMIT
65 #endif
66
67 #ifndef KEXEC_CRASH_MEM_ALIGN
68 #define KEXEC_CRASH_MEM_ALIGN PAGE_SIZE
69 #endif
70
71 #define KEXEC_CORE_NOTE_NAME CRASH_CORE_NOTE_NAME
72
73 /*
74 * This structure is used to hold the arguments that are used when loading
75 * kernel binaries.
76 */
77
78 typedef unsigned long kimage_entry_t;
79
80 struct kexec_segment {
81 /*
82 * This pointer can point to user memory if kexec_load() system
83 * call is used or will point to kernel memory if
84 * kexec_file_load() system call is used.
85 *
86 * Use ->buf when expecting to deal with user memory and use ->kbuf
87 * when expecting to deal with kernel memory.
88 */
89 union {
90 void __user *buf;
91 void *kbuf;
92 };
93 size_t bufsz;
94 unsigned long mem;
95 size_t memsz;
96 };
97
98 #ifdef CONFIG_COMPAT
99 struct compat_kexec_segment {
100 compat_uptr_t buf;
101 compat_size_t bufsz;
102 compat_ulong_t mem; /* User space sees this as a (void *) ... */
103 compat_size_t memsz;
104 };
105 #endif
106
107 #ifdef CONFIG_KEXEC_FILE
108 struct purgatory_info {
109 /*
110 * Pointer to elf header at the beginning of kexec_purgatory.
111 * Note: kexec_purgatory is read only
112 */
113 const Elf_Ehdr *ehdr;
114 /*
115 * Temporary, modifiable buffer for sechdrs used for relocation.
116 * This memory can be freed post image load.
117 */
118 Elf_Shdr *sechdrs;
119 /*
120 * Temporary, modifiable buffer for stripped purgatory used for
121 * relocation. This memory can be freed post image load.
122 */
123 void *purgatory_buf;
124 };
125
126 struct kimage;
127
128 typedef int (kexec_probe_t)(const char *kernel_buf, unsigned long kernel_size);
129 typedef void *(kexec_load_t)(struct kimage *image, char *kernel_buf,
130 unsigned long kernel_len, char *initrd,
131 unsigned long initrd_len, char *cmdline,
132 unsigned long cmdline_len);
133 typedef int (kexec_cleanup_t)(void *loader_data);
134
135 #ifdef CONFIG_KEXEC_SIG
136 typedef int (kexec_verify_sig_t)(const char *kernel_buf,
137 unsigned long kernel_len);
138 #endif
139
140 struct kexec_file_ops {
141 kexec_probe_t *probe;
142 kexec_load_t *load;
143 kexec_cleanup_t *cleanup;
144 #ifdef CONFIG_KEXEC_SIG
145 kexec_verify_sig_t *verify_sig;
146 #endif
147 };
148
149 extern const struct kexec_file_ops * const kexec_file_loaders[];
150
151 int kexec_image_probe_default(struct kimage *image, void *buf,
152 unsigned long buf_len);
153 int kexec_image_post_load_cleanup_default(struct kimage *image);
154
155 /*
156 * If kexec_buf.mem is set to this value, kexec_locate_mem_hole()
157 * will try to allocate free memory. Arch may overwrite it.
158 */
159 #ifndef KEXEC_BUF_MEM_UNKNOWN
160 #define KEXEC_BUF_MEM_UNKNOWN 0
161 #endif
162
163 /**
164 * struct kexec_buf - parameters for finding a place for a buffer in memory
165 * @image: kexec image in which memory to search.
166 * @buffer: Contents which will be copied to the allocated memory.
167 * @bufsz: Size of @buffer.
168 * @mem: On return will have address of the buffer in memory.
169 * @memsz: Size for the buffer in memory.
170 * @buf_align: Minimum alignment needed.
171 * @buf_min: The buffer can't be placed below this address.
172 * @buf_max: The buffer can't be placed above this address.
173 * @top_down: Allocate from top of memory.
174 */
175 struct kexec_buf {
176 struct kimage *image;
177 void *buffer;
178 unsigned long bufsz;
179 unsigned long mem;
180 unsigned long memsz;
181 unsigned long buf_align;
182 unsigned long buf_min;
183 unsigned long buf_max;
184 bool top_down;
185 };
186
187 int kexec_load_purgatory(struct kimage *image, struct kexec_buf *kbuf);
188 int kexec_purgatory_get_set_symbol(struct kimage *image, const char *name,
189 void *buf, unsigned int size,
190 bool get_value);
191 void *kexec_purgatory_get_symbol_addr(struct kimage *image, const char *name);
192
193 #ifndef arch_kexec_kernel_image_probe
194 static inline int
arch_kexec_kernel_image_probe(struct kimage * image,void * buf,unsigned long buf_len)195 arch_kexec_kernel_image_probe(struct kimage *image, void *buf, unsigned long buf_len)
196 {
197 return kexec_image_probe_default(image, buf, buf_len);
198 }
199 #endif
200
201 #ifndef arch_kimage_file_post_load_cleanup
arch_kimage_file_post_load_cleanup(struct kimage * image)202 static inline int arch_kimage_file_post_load_cleanup(struct kimage *image)
203 {
204 return kexec_image_post_load_cleanup_default(image);
205 }
206 #endif
207
208 #ifdef CONFIG_KEXEC_SIG
209 #ifdef CONFIG_SIGNED_PE_FILE_VERIFICATION
210 int kexec_kernel_verify_pe_sig(const char *kernel, unsigned long kernel_len);
211 #endif
212 #endif
213
214 extern int kexec_add_buffer(struct kexec_buf *kbuf);
215 int kexec_locate_mem_hole(struct kexec_buf *kbuf);
216
217 #ifndef arch_kexec_locate_mem_hole
218 /**
219 * arch_kexec_locate_mem_hole - Find free memory to place the segments.
220 * @kbuf: Parameters for the memory search.
221 *
222 * On success, kbuf->mem will have the start address of the memory region found.
223 *
224 * Return: 0 on success, negative errno on error.
225 */
arch_kexec_locate_mem_hole(struct kexec_buf * kbuf)226 static inline int arch_kexec_locate_mem_hole(struct kexec_buf *kbuf)
227 {
228 return kexec_locate_mem_hole(kbuf);
229 }
230 #endif
231
232 #ifndef arch_kexec_apply_relocations_add
233 /*
234 * arch_kexec_apply_relocations_add - apply relocations of type RELA
235 * @pi: Purgatory to be relocated.
236 * @section: Section relocations applying to.
237 * @relsec: Section containing RELAs.
238 * @symtab: Corresponding symtab.
239 *
240 * Return: 0 on success, negative errno on error.
241 */
242 static inline int
arch_kexec_apply_relocations_add(struct purgatory_info * pi,Elf_Shdr * section,const Elf_Shdr * relsec,const Elf_Shdr * symtab)243 arch_kexec_apply_relocations_add(struct purgatory_info *pi, Elf_Shdr *section,
244 const Elf_Shdr *relsec, const Elf_Shdr *symtab)
245 {
246 pr_err("RELA relocation unsupported.\n");
247 return -ENOEXEC;
248 }
249 #endif
250
251 #ifndef arch_kexec_apply_relocations
252 /*
253 * arch_kexec_apply_relocations - apply relocations of type REL
254 * @pi: Purgatory to be relocated.
255 * @section: Section relocations applying to.
256 * @relsec: Section containing RELs.
257 * @symtab: Corresponding symtab.
258 *
259 * Return: 0 on success, negative errno on error.
260 */
261 static inline int
arch_kexec_apply_relocations(struct purgatory_info * pi,Elf_Shdr * section,const Elf_Shdr * relsec,const Elf_Shdr * symtab)262 arch_kexec_apply_relocations(struct purgatory_info *pi, Elf_Shdr *section,
263 const Elf_Shdr *relsec, const Elf_Shdr *symtab)
264 {
265 pr_err("REL relocation unsupported.\n");
266 return -ENOEXEC;
267 }
268 #endif
269 #endif /* CONFIG_KEXEC_FILE */
270
271 #ifdef CONFIG_KEXEC_ELF
272 struct kexec_elf_info {
273 /*
274 * Where the ELF binary contents are kept.
275 * Memory managed by the user of the struct.
276 */
277 const char *buffer;
278
279 const struct elfhdr *ehdr;
280 const struct elf_phdr *proghdrs;
281 };
282
283 int kexec_build_elf_info(const char *buf, size_t len, struct elfhdr *ehdr,
284 struct kexec_elf_info *elf_info);
285
286 int kexec_elf_load(struct kimage *image, struct elfhdr *ehdr,
287 struct kexec_elf_info *elf_info,
288 struct kexec_buf *kbuf,
289 unsigned long *lowest_load_addr);
290
291 void kexec_free_elf_info(struct kexec_elf_info *elf_info);
292 int kexec_elf_probe(const char *buf, unsigned long len);
293 #endif
294 struct kimage {
295 kimage_entry_t head;
296 kimage_entry_t *entry;
297 kimage_entry_t *last_entry;
298
299 unsigned long start;
300 struct page *control_code_page;
301 struct page *swap_page;
302 void *vmcoreinfo_data_copy; /* locates in the crash memory */
303
304 unsigned long nr_segments;
305 struct kexec_segment segment[KEXEC_SEGMENT_MAX];
306
307 struct list_head control_pages;
308 struct list_head dest_pages;
309 struct list_head unusable_pages;
310
311 /* Address of next control page to allocate for crash kernels. */
312 unsigned long control_page;
313
314 /* Flags to indicate special processing */
315 unsigned int type : 1;
316 #define KEXEC_TYPE_DEFAULT 0
317 #define KEXEC_TYPE_CRASH 1
318 unsigned int preserve_context : 1;
319 /* If set, we are using file mode kexec syscall */
320 unsigned int file_mode:1;
321 #ifdef CONFIG_CRASH_HOTPLUG
322 /* If set, allow changes to elfcorehdr of kexec_load'd image */
323 unsigned int update_elfcorehdr:1;
324 #endif
325
326 #ifdef ARCH_HAS_KIMAGE_ARCH
327 struct kimage_arch arch;
328 #endif
329
330 #ifdef CONFIG_KEXEC_FILE
331 /* Additional fields for file based kexec syscall */
332 void *kernel_buf;
333 unsigned long kernel_buf_len;
334
335 void *initrd_buf;
336 unsigned long initrd_buf_len;
337
338 char *cmdline_buf;
339 unsigned long cmdline_buf_len;
340
341 /* File operations provided by image loader */
342 const struct kexec_file_ops *fops;
343
344 /* Image loader handling the kernel can store a pointer here */
345 void *image_loader_data;
346
347 /* Information for loading purgatory */
348 struct purgatory_info purgatory_info;
349 #endif
350
351 #ifdef CONFIG_CRASH_HOTPLUG
352 int hp_action;
353 int elfcorehdr_index;
354 bool elfcorehdr_updated;
355 #endif
356
357 #ifdef CONFIG_IMA_KEXEC
358 /* Virtual address of IMA measurement buffer for kexec syscall */
359 void *ima_buffer;
360
361 phys_addr_t ima_buffer_addr;
362 size_t ima_buffer_size;
363 #endif
364
365 /* Core ELF header buffer */
366 void *elf_headers;
367 unsigned long elf_headers_sz;
368 unsigned long elf_load_addr;
369 };
370
371 /* kexec interface functions */
372 extern void machine_kexec(struct kimage *image);
373 extern int machine_kexec_prepare(struct kimage *image);
374 extern void machine_kexec_cleanup(struct kimage *image);
375 extern int kernel_kexec(void);
376 extern struct page *kimage_alloc_control_pages(struct kimage *image,
377 unsigned int order);
378
379 #ifndef machine_kexec_post_load
machine_kexec_post_load(struct kimage * image)380 static inline int machine_kexec_post_load(struct kimage *image) { return 0; }
381 #endif
382
383 extern struct kimage *kexec_image;
384 extern struct kimage *kexec_crash_image;
385
386 bool kexec_load_permitted(int kexec_image_type);
387
388 #ifndef kexec_flush_icache_page
389 #define kexec_flush_icache_page(page)
390 #endif
391
392 /* List of defined/legal kexec flags */
393 #ifndef CONFIG_KEXEC_JUMP
394 #define KEXEC_FLAGS (KEXEC_ON_CRASH | KEXEC_UPDATE_ELFCOREHDR)
395 #else
396 #define KEXEC_FLAGS (KEXEC_ON_CRASH | KEXEC_PRESERVE_CONTEXT | KEXEC_UPDATE_ELFCOREHDR)
397 #endif
398
399 /* List of defined/legal kexec file flags */
400 #define KEXEC_FILE_FLAGS (KEXEC_FILE_UNLOAD | KEXEC_FILE_ON_CRASH | \
401 KEXEC_FILE_NO_INITRAMFS | KEXEC_FILE_DEBUG)
402
403 /* flag to track if kexec reboot is in progress */
404 extern bool kexec_in_progress;
405
406 #ifndef page_to_boot_pfn
page_to_boot_pfn(struct page * page)407 static inline unsigned long page_to_boot_pfn(struct page *page)
408 {
409 return page_to_pfn(page);
410 }
411 #endif
412
413 #ifndef boot_pfn_to_page
boot_pfn_to_page(unsigned long boot_pfn)414 static inline struct page *boot_pfn_to_page(unsigned long boot_pfn)
415 {
416 return pfn_to_page(boot_pfn);
417 }
418 #endif
419
420 #ifndef phys_to_boot_phys
phys_to_boot_phys(phys_addr_t phys)421 static inline unsigned long phys_to_boot_phys(phys_addr_t phys)
422 {
423 return phys;
424 }
425 #endif
426
427 #ifndef boot_phys_to_phys
boot_phys_to_phys(unsigned long boot_phys)428 static inline phys_addr_t boot_phys_to_phys(unsigned long boot_phys)
429 {
430 return boot_phys;
431 }
432 #endif
433
434 #ifndef crash_free_reserved_phys_range
crash_free_reserved_phys_range(unsigned long begin,unsigned long end)435 static inline void crash_free_reserved_phys_range(unsigned long begin, unsigned long end)
436 {
437 unsigned long addr;
438
439 for (addr = begin; addr < end; addr += PAGE_SIZE)
440 free_reserved_page(boot_pfn_to_page(addr >> PAGE_SHIFT));
441 }
442 #endif
443
virt_to_boot_phys(void * addr)444 static inline unsigned long virt_to_boot_phys(void *addr)
445 {
446 return phys_to_boot_phys(__pa((unsigned long)addr));
447 }
448
boot_phys_to_virt(unsigned long entry)449 static inline void *boot_phys_to_virt(unsigned long entry)
450 {
451 return phys_to_virt(boot_phys_to_phys(entry));
452 }
453
454 #ifndef arch_kexec_post_alloc_pages
arch_kexec_post_alloc_pages(void * vaddr,unsigned int pages,gfp_t gfp)455 static inline int arch_kexec_post_alloc_pages(void *vaddr, unsigned int pages, gfp_t gfp) { return 0; }
456 #endif
457
458 #ifndef arch_kexec_pre_free_pages
arch_kexec_pre_free_pages(void * vaddr,unsigned int pages)459 static inline void arch_kexec_pre_free_pages(void *vaddr, unsigned int pages) { }
460 #endif
461
462 extern bool kexec_file_dbg_print;
463
464 #define kexec_dprintk(fmt, ...) \
465 printk("%s" fmt, \
466 kexec_file_dbg_print ? KERN_INFO : KERN_DEBUG, \
467 ##__VA_ARGS__)
468
469 #else /* !CONFIG_KEXEC_CORE */
470 struct pt_regs;
471 struct task_struct;
__crash_kexec(struct pt_regs * regs)472 static inline void __crash_kexec(struct pt_regs *regs) { }
crash_kexec(struct pt_regs * regs)473 static inline void crash_kexec(struct pt_regs *regs) { }
kexec_should_crash(struct task_struct * p)474 static inline int kexec_should_crash(struct task_struct *p) { return 0; }
kexec_crash_loaded(void)475 static inline int kexec_crash_loaded(void) { return 0; }
476 #define kexec_in_progress false
477 #endif /* CONFIG_KEXEC_CORE */
478
479 #ifdef CONFIG_KEXEC_SIG
480 void set_kexec_sig_enforced(void);
481 #else
set_kexec_sig_enforced(void)482 static inline void set_kexec_sig_enforced(void) {}
483 #endif
484
485 #endif /* !defined(__ASSEBMLY__) */
486
487 #endif /* LINUX_KEXEC_H */
488