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1da177e4 LT |
1 | /* binfmt_elf_fdpic.c: FDPIC ELF binary format |
2 | * | |
8a2ab7f5 | 3 | * Copyright (C) 2003, 2004, 2006 Red Hat, Inc. All Rights Reserved. |
1da177e4 LT |
4 | * Written by David Howells (dhowells@redhat.com) |
5 | * Derived from binfmt_elf.c | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or | |
8 | * modify it under the terms of the GNU General Public License | |
9 | * as published by the Free Software Foundation; either version | |
10 | * 2 of the License, or (at your option) any later version. | |
11 | */ | |
12 | ||
13 | #include <linux/module.h> | |
14 | ||
15 | #include <linux/fs.h> | |
16 | #include <linux/stat.h> | |
17 | #include <linux/sched.h> | |
18 | #include <linux/mm.h> | |
19 | #include <linux/mman.h> | |
20 | #include <linux/errno.h> | |
21 | #include <linux/signal.h> | |
22 | #include <linux/binfmts.h> | |
23 | #include <linux/string.h> | |
24 | #include <linux/file.h> | |
25 | #include <linux/fcntl.h> | |
26 | #include <linux/slab.h> | |
6d8c4e3b | 27 | #include <linux/pagemap.h> |
5edc2a51 | 28 | #include <linux/security.h> |
1da177e4 | 29 | #include <linux/highmem.h> |
6d8c4e3b | 30 | #include <linux/highuid.h> |
1da177e4 LT |
31 | #include <linux/personality.h> |
32 | #include <linux/ptrace.h> | |
33 | #include <linux/init.h> | |
1da177e4 LT |
34 | #include <linux/elf.h> |
35 | #include <linux/elf-fdpic.h> | |
36 | #include <linux/elfcore.h> | |
088e7af7 | 37 | #include <linux/coredump.h> |
f7ccbae4 | 38 | #include <linux/sched/coredump.h> |
ab27a8d0 | 39 | #include <linux/dax.h> |
1da177e4 | 40 | |
7c0f6ba6 | 41 | #include <linux/uaccess.h> |
1da177e4 LT |
42 | #include <asm/param.h> |
43 | #include <asm/pgalloc.h> | |
44 | ||
45 | typedef char *elf_caddr_t; | |
1da177e4 LT |
46 | |
47 | #if 0 | |
48 | #define kdebug(fmt, ...) printk("FDPIC "fmt"\n" ,##__VA_ARGS__ ) | |
49 | #else | |
50 | #define kdebug(fmt, ...) do {} while(0) | |
51 | #endif | |
52 | ||
6d8c4e3b DH |
53 | #if 0 |
54 | #define kdcore(fmt, ...) printk("FDPIC "fmt"\n" ,##__VA_ARGS__ ) | |
55 | #else | |
56 | #define kdcore(fmt, ...) do {} while(0) | |
57 | #endif | |
58 | ||
1da177e4 LT |
59 | MODULE_LICENSE("GPL"); |
60 | ||
71613c3b | 61 | static int load_elf_fdpic_binary(struct linux_binprm *); |
8a2ab7f5 DH |
62 | static int elf_fdpic_fetch_phdrs(struct elf_fdpic_params *, struct file *); |
63 | static int elf_fdpic_map_file(struct elf_fdpic_params *, struct file *, | |
64 | struct mm_struct *, const char *); | |
1da177e4 | 65 | |
8a2ab7f5 DH |
66 | static int create_elf_fdpic_tables(struct linux_binprm *, struct mm_struct *, |
67 | struct elf_fdpic_params *, | |
68 | struct elf_fdpic_params *); | |
1da177e4 LT |
69 | |
70 | #ifndef CONFIG_MMU | |
8a2ab7f5 DH |
71 | static int elf_fdpic_map_file_constdisp_on_uclinux(struct elf_fdpic_params *, |
72 | struct file *, | |
73 | struct mm_struct *); | |
1da177e4 LT |
74 | #endif |
75 | ||
8a2ab7f5 DH |
76 | static int elf_fdpic_map_file_by_direct_mmap(struct elf_fdpic_params *, |
77 | struct file *, struct mm_struct *); | |
1da177e4 | 78 | |
698ba7b5 | 79 | #ifdef CONFIG_ELF_CORE |
f6151dfe | 80 | static int elf_fdpic_core_dump(struct coredump_params *cprm); |
6d8c4e3b DH |
81 | #endif |
82 | ||
1da177e4 LT |
83 | static struct linux_binfmt elf_fdpic_format = { |
84 | .module = THIS_MODULE, | |
85 | .load_binary = load_elf_fdpic_binary, | |
698ba7b5 | 86 | #ifdef CONFIG_ELF_CORE |
6d8c4e3b DH |
87 | .core_dump = elf_fdpic_core_dump, |
88 | #endif | |
1da177e4 LT |
89 | .min_coredump = ELF_EXEC_PAGESIZE, |
90 | }; | |
91 | ||
8a2ab7f5 DH |
92 | static int __init init_elf_fdpic_binfmt(void) |
93 | { | |
8fc3dc5a AV |
94 | register_binfmt(&elf_fdpic_format); |
95 | return 0; | |
8a2ab7f5 | 96 | } |
1da177e4 | 97 | |
8a2ab7f5 DH |
98 | static void __exit exit_elf_fdpic_binfmt(void) |
99 | { | |
100 | unregister_binfmt(&elf_fdpic_format); | |
101 | } | |
102 | ||
6d8c4e3b | 103 | core_initcall(init_elf_fdpic_binfmt); |
8a2ab7f5 | 104 | module_exit(exit_elf_fdpic_binfmt); |
1da177e4 | 105 | |
1bde925d | 106 | static int is_elf(struct elfhdr *hdr, struct file *file) |
1da177e4 LT |
107 | { |
108 | if (memcmp(hdr->e_ident, ELFMAG, SELFMAG) != 0) | |
109 | return 0; | |
110 | if (hdr->e_type != ET_EXEC && hdr->e_type != ET_DYN) | |
111 | return 0; | |
1bde925d | 112 | if (!elf_check_arch(hdr)) |
1da177e4 | 113 | return 0; |
72c2d531 | 114 | if (!file->f_op->mmap) |
1da177e4 LT |
115 | return 0; |
116 | return 1; | |
117 | } | |
118 | ||
1bde925d RF |
119 | #ifndef elf_check_fdpic |
120 | #define elf_check_fdpic(x) 0 | |
121 | #endif | |
122 | ||
123 | #ifndef elf_check_const_displacement | |
124 | #define elf_check_const_displacement(x) 0 | |
125 | #endif | |
126 | ||
127 | static int is_constdisp(struct elfhdr *hdr) | |
128 | { | |
129 | if (!elf_check_fdpic(hdr)) | |
130 | return 1; | |
131 | if (elf_check_const_displacement(hdr)) | |
132 | return 1; | |
133 | return 0; | |
134 | } | |
135 | ||
1da177e4 LT |
136 | /*****************************************************************************/ |
137 | /* | |
138 | * read the program headers table into memory | |
139 | */ | |
8a2ab7f5 DH |
140 | static int elf_fdpic_fetch_phdrs(struct elf_fdpic_params *params, |
141 | struct file *file) | |
1da177e4 LT |
142 | { |
143 | struct elf32_phdr *phdr; | |
144 | unsigned long size; | |
145 | int retval, loop; | |
146 | ||
147 | if (params->hdr.e_phentsize != sizeof(struct elf_phdr)) | |
148 | return -ENOMEM; | |
149 | if (params->hdr.e_phnum > 65536U / sizeof(struct elf_phdr)) | |
150 | return -ENOMEM; | |
151 | ||
152 | size = params->hdr.e_phnum * sizeof(struct elf_phdr); | |
153 | params->phdrs = kmalloc(size, GFP_KERNEL); | |
154 | if (!params->phdrs) | |
155 | return -ENOMEM; | |
156 | ||
8a2ab7f5 DH |
157 | retval = kernel_read(file, params->hdr.e_phoff, |
158 | (char *) params->phdrs, size); | |
e1d2c8b6 DH |
159 | if (unlikely(retval != size)) |
160 | return retval < 0 ? retval : -ENOEXEC; | |
1da177e4 LT |
161 | |
162 | /* determine stack size for this binary */ | |
163 | phdr = params->phdrs; | |
164 | for (loop = 0; loop < params->hdr.e_phnum; loop++, phdr++) { | |
165 | if (phdr->p_type != PT_GNU_STACK) | |
166 | continue; | |
167 | ||
168 | if (phdr->p_flags & PF_X) | |
169 | params->flags |= ELF_FDPIC_FLAG_EXEC_STACK; | |
170 | else | |
171 | params->flags |= ELF_FDPIC_FLAG_NOEXEC_STACK; | |
172 | ||
173 | params->stack_size = phdr->p_memsz; | |
174 | break; | |
175 | } | |
176 | ||
177 | return 0; | |
8a2ab7f5 | 178 | } |
1da177e4 LT |
179 | |
180 | /*****************************************************************************/ | |
181 | /* | |
182 | * load an fdpic binary into various bits of memory | |
183 | */ | |
71613c3b | 184 | static int load_elf_fdpic_binary(struct linux_binprm *bprm) |
1da177e4 LT |
185 | { |
186 | struct elf_fdpic_params exec_params, interp_params; | |
71613c3b | 187 | struct pt_regs *regs = current_pt_regs(); |
1da177e4 | 188 | struct elf_phdr *phdr; |
8a2ab7f5 | 189 | unsigned long stack_size, entryaddr; |
8a2ab7f5 DH |
190 | #ifdef ELF_FDPIC_PLAT_INIT |
191 | unsigned long dynaddr; | |
04e4f2b1 MF |
192 | #endif |
193 | #ifndef CONFIG_MMU | |
194 | unsigned long stack_prot; | |
8a2ab7f5 | 195 | #endif |
1da177e4 LT |
196 | struct file *interpreter = NULL; /* to shut gcc up */ |
197 | char *interpreter_name = NULL; | |
198 | int executable_stack; | |
199 | int retval, i; | |
200 | ||
aa289b47 DH |
201 | kdebug("____ LOAD %d ____", current->pid); |
202 | ||
1da177e4 LT |
203 | memset(&exec_params, 0, sizeof(exec_params)); |
204 | memset(&interp_params, 0, sizeof(interp_params)); | |
205 | ||
206 | exec_params.hdr = *(struct elfhdr *) bprm->buf; | |
207 | exec_params.flags = ELF_FDPIC_FLAG_PRESENT | ELF_FDPIC_FLAG_EXECUTABLE; | |
208 | ||
209 | /* check that this is a binary we know how to deal with */ | |
210 | retval = -ENOEXEC; | |
1bde925d | 211 | if (!is_elf(&exec_params.hdr, bprm->file)) |
1da177e4 | 212 | goto error; |
1bde925d RF |
213 | if (!elf_check_fdpic(&exec_params.hdr)) { |
214 | #ifdef CONFIG_MMU | |
215 | /* binfmt_elf handles non-fdpic elf except on nommu */ | |
216 | goto error; | |
217 | #else | |
218 | /* nommu can only load ET_DYN (PIE) ELF */ | |
219 | if (exec_params.hdr.e_type != ET_DYN) | |
220 | goto error; | |
221 | #endif | |
222 | } | |
1da177e4 LT |
223 | |
224 | /* read the program header table */ | |
225 | retval = elf_fdpic_fetch_phdrs(&exec_params, bprm->file); | |
226 | if (retval < 0) | |
227 | goto error; | |
228 | ||
229 | /* scan for a program header that specifies an interpreter */ | |
230 | phdr = exec_params.phdrs; | |
231 | ||
232 | for (i = 0; i < exec_params.hdr.e_phnum; i++, phdr++) { | |
233 | switch (phdr->p_type) { | |
234 | case PT_INTERP: | |
235 | retval = -ENOMEM; | |
236 | if (phdr->p_filesz > PATH_MAX) | |
237 | goto error; | |
238 | retval = -ENOENT; | |
239 | if (phdr->p_filesz < 2) | |
240 | goto error; | |
241 | ||
242 | /* read the name of the interpreter into memory */ | |
792db3af | 243 | interpreter_name = kmalloc(phdr->p_filesz, GFP_KERNEL); |
1da177e4 LT |
244 | if (!interpreter_name) |
245 | goto error; | |
246 | ||
247 | retval = kernel_read(bprm->file, | |
248 | phdr->p_offset, | |
249 | interpreter_name, | |
250 | phdr->p_filesz); | |
e1d2c8b6 DH |
251 | if (unlikely(retval != phdr->p_filesz)) { |
252 | if (retval >= 0) | |
253 | retval = -ENOEXEC; | |
1da177e4 | 254 | goto error; |
e1d2c8b6 | 255 | } |
1da177e4 LT |
256 | |
257 | retval = -ENOENT; | |
258 | if (interpreter_name[phdr->p_filesz - 1] != '\0') | |
259 | goto error; | |
260 | ||
261 | kdebug("Using ELF interpreter %s", interpreter_name); | |
262 | ||
263 | /* replace the program with the interpreter */ | |
264 | interpreter = open_exec(interpreter_name); | |
265 | retval = PTR_ERR(interpreter); | |
266 | if (IS_ERR(interpreter)) { | |
267 | interpreter = NULL; | |
268 | goto error; | |
269 | } | |
270 | ||
1fb84496 AD |
271 | /* |
272 | * If the binary is not readable then enforce | |
273 | * mm->dumpable = 0 regardless of the interpreter's | |
274 | * permissions. | |
275 | */ | |
1b5d783c | 276 | would_dump(bprm, interpreter); |
1fb84496 | 277 | |
8a2ab7f5 DH |
278 | retval = kernel_read(interpreter, 0, bprm->buf, |
279 | BINPRM_BUF_SIZE); | |
e1d2c8b6 DH |
280 | if (unlikely(retval != BINPRM_BUF_SIZE)) { |
281 | if (retval >= 0) | |
282 | retval = -ENOEXEC; | |
1da177e4 | 283 | goto error; |
e1d2c8b6 | 284 | } |
1da177e4 LT |
285 | |
286 | interp_params.hdr = *((struct elfhdr *) bprm->buf); | |
287 | break; | |
288 | ||
289 | case PT_LOAD: | |
290 | #ifdef CONFIG_MMU | |
291 | if (exec_params.load_addr == 0) | |
292 | exec_params.load_addr = phdr->p_vaddr; | |
293 | #endif | |
294 | break; | |
295 | } | |
296 | ||
297 | } | |
298 | ||
1bde925d | 299 | if (is_constdisp(&exec_params.hdr)) |
1da177e4 LT |
300 | exec_params.flags |= ELF_FDPIC_FLAG_CONSTDISP; |
301 | ||
302 | /* perform insanity checks on the interpreter */ | |
303 | if (interpreter_name) { | |
304 | retval = -ELIBBAD; | |
1bde925d | 305 | if (!is_elf(&interp_params.hdr, interpreter)) |
1da177e4 LT |
306 | goto error; |
307 | ||
308 | interp_params.flags = ELF_FDPIC_FLAG_PRESENT; | |
309 | ||
310 | /* read the interpreter's program header table */ | |
311 | retval = elf_fdpic_fetch_phdrs(&interp_params, interpreter); | |
312 | if (retval < 0) | |
313 | goto error; | |
314 | } | |
315 | ||
316 | stack_size = exec_params.stack_size; | |
1da177e4 LT |
317 | if (exec_params.flags & ELF_FDPIC_FLAG_EXEC_STACK) |
318 | executable_stack = EXSTACK_ENABLE_X; | |
319 | else if (exec_params.flags & ELF_FDPIC_FLAG_NOEXEC_STACK) | |
320 | executable_stack = EXSTACK_DISABLE_X; | |
1da177e4 LT |
321 | else |
322 | executable_stack = EXSTACK_DEFAULT; | |
323 | ||
8e8b63a6 DH |
324 | if (stack_size == 0) { |
325 | stack_size = interp_params.stack_size; | |
326 | if (interp_params.flags & ELF_FDPIC_FLAG_EXEC_STACK) | |
327 | executable_stack = EXSTACK_ENABLE_X; | |
328 | else if (interp_params.flags & ELF_FDPIC_FLAG_NOEXEC_STACK) | |
329 | executable_stack = EXSTACK_DISABLE_X; | |
330 | else | |
331 | executable_stack = EXSTACK_DEFAULT; | |
332 | } | |
333 | ||
1da177e4 LT |
334 | retval = -ENOEXEC; |
335 | if (stack_size == 0) | |
1bde925d | 336 | stack_size = 131072UL; /* same as exec.c's default commit */ |
1da177e4 | 337 | |
1bde925d | 338 | if (is_constdisp(&interp_params.hdr)) |
1da177e4 LT |
339 | interp_params.flags |= ELF_FDPIC_FLAG_CONSTDISP; |
340 | ||
341 | /* flush all traces of the currently running executable */ | |
342 | retval = flush_old_exec(bprm); | |
343 | if (retval) | |
344 | goto error; | |
345 | ||
346 | /* there's now no turning back... the old userspace image is dead, | |
19d860a1 AV |
347 | * defunct, deceased, etc. |
348 | */ | |
1bde925d RF |
349 | if (elf_check_fdpic(&exec_params.hdr)) |
350 | set_personality(PER_LINUX_FDPIC); | |
351 | else | |
352 | set_personality(PER_LINUX); | |
04e4f2b1 MF |
353 | if (elf_read_implies_exec(&exec_params.hdr, executable_stack)) |
354 | current->personality |= READ_IMPLIES_EXEC; | |
221af7f8 LT |
355 | |
356 | setup_new_exec(bprm); | |
357 | ||
1da177e4 LT |
358 | set_binfmt(&elf_fdpic_format); |
359 | ||
360 | current->mm->start_code = 0; | |
361 | current->mm->end_code = 0; | |
362 | current->mm->start_stack = 0; | |
363 | current->mm->start_data = 0; | |
364 | current->mm->end_data = 0; | |
365 | current->mm->context.exec_fdpic_loadmap = 0; | |
366 | current->mm->context.interp_fdpic_loadmap = 0; | |
367 | ||
1da177e4 LT |
368 | #ifdef CONFIG_MMU |
369 | elf_fdpic_arch_lay_out_mm(&exec_params, | |
370 | &interp_params, | |
371 | ¤t->mm->start_stack, | |
372 | ¤t->mm->start_brk); | |
1da177e4 | 373 | |
8a2ab7f5 DH |
374 | retval = setup_arg_pages(bprm, current->mm->start_stack, |
375 | executable_stack); | |
19d860a1 AV |
376 | if (retval < 0) |
377 | goto error; | |
1da177e4 LT |
378 | #endif |
379 | ||
380 | /* load the executable and interpreter into memory */ | |
8a2ab7f5 DH |
381 | retval = elf_fdpic_map_file(&exec_params, bprm->file, current->mm, |
382 | "executable"); | |
1da177e4 | 383 | if (retval < 0) |
19d860a1 | 384 | goto error; |
1da177e4 LT |
385 | |
386 | if (interpreter_name) { | |
387 | retval = elf_fdpic_map_file(&interp_params, interpreter, | |
388 | current->mm, "interpreter"); | |
389 | if (retval < 0) { | |
390 | printk(KERN_ERR "Unable to load interpreter\n"); | |
19d860a1 | 391 | goto error; |
1da177e4 LT |
392 | } |
393 | ||
394 | allow_write_access(interpreter); | |
395 | fput(interpreter); | |
396 | interpreter = NULL; | |
397 | } | |
398 | ||
399 | #ifdef CONFIG_MMU | |
400 | if (!current->mm->start_brk) | |
401 | current->mm->start_brk = current->mm->end_data; | |
402 | ||
8a2ab7f5 DH |
403 | current->mm->brk = current->mm->start_brk = |
404 | PAGE_ALIGN(current->mm->start_brk); | |
1da177e4 LT |
405 | |
406 | #else | |
4ac31311 | 407 | /* create a stack area and zero-size brk area */ |
1da177e4 LT |
408 | stack_size = (stack_size + PAGE_SIZE - 1) & PAGE_MASK; |
409 | if (stack_size < PAGE_SIZE * 2) | |
410 | stack_size = PAGE_SIZE * 2; | |
411 | ||
04e4f2b1 MF |
412 | stack_prot = PROT_READ | PROT_WRITE; |
413 | if (executable_stack == EXSTACK_ENABLE_X || | |
414 | (executable_stack == EXSTACK_DEFAULT && VM_STACK_FLAGS & VM_EXEC)) | |
415 | stack_prot |= PROT_EXEC; | |
416 | ||
6be5ceb0 | 417 | current->mm->start_brk = vm_mmap(NULL, 0, stack_size, stack_prot, |
ea637639 JZ |
418 | MAP_PRIVATE | MAP_ANONYMOUS | |
419 | MAP_UNINITIALIZED | MAP_GROWSDOWN, | |
1da177e4 LT |
420 | 0); |
421 | ||
8a2ab7f5 | 422 | if (IS_ERR_VALUE(current->mm->start_brk)) { |
1da177e4 LT |
423 | retval = current->mm->start_brk; |
424 | current->mm->start_brk = 0; | |
19d860a1 | 425 | goto error; |
1da177e4 LT |
426 | } |
427 | ||
1da177e4 LT |
428 | current->mm->brk = current->mm->start_brk; |
429 | current->mm->context.end_brk = current->mm->start_brk; | |
1da177e4 LT |
430 | current->mm->start_stack = current->mm->start_brk + stack_size; |
431 | #endif | |
432 | ||
a6f76f23 | 433 | install_exec_creds(bprm); |
8a2ab7f5 DH |
434 | if (create_elf_fdpic_tables(bprm, current->mm, |
435 | &exec_params, &interp_params) < 0) | |
19d860a1 | 436 | goto error; |
1da177e4 | 437 | |
8a2ab7f5 DH |
438 | kdebug("- start_code %lx", current->mm->start_code); |
439 | kdebug("- end_code %lx", current->mm->end_code); | |
440 | kdebug("- start_data %lx", current->mm->start_data); | |
441 | kdebug("- end_data %lx", current->mm->end_data); | |
442 | kdebug("- start_brk %lx", current->mm->start_brk); | |
443 | kdebug("- brk %lx", current->mm->brk); | |
444 | kdebug("- start_stack %lx", current->mm->start_stack); | |
1da177e4 LT |
445 | |
446 | #ifdef ELF_FDPIC_PLAT_INIT | |
447 | /* | |
448 | * The ABI may specify that certain registers be set up in special | |
449 | * ways (on i386 %edx is the address of a DT_FINI function, for | |
450 | * example. This macro performs whatever initialization to | |
451 | * the regs structure is required. | |
452 | */ | |
8a2ab7f5 DH |
453 | dynaddr = interp_params.dynamic_addr ?: exec_params.dynamic_addr; |
454 | ELF_FDPIC_PLAT_INIT(regs, exec_params.map_addr, interp_params.map_addr, | |
455 | dynaddr); | |
1da177e4 LT |
456 | #endif |
457 | ||
458 | /* everything is now ready... get the userspace context ready to roll */ | |
8a2ab7f5 DH |
459 | entryaddr = interp_params.entry_addr ?: exec_params.entry_addr; |
460 | start_thread(regs, entryaddr, current->mm->start_stack); | |
1da177e4 | 461 | |
1da177e4 LT |
462 | retval = 0; |
463 | ||
464 | error: | |
465 | if (interpreter) { | |
466 | allow_write_access(interpreter); | |
467 | fput(interpreter); | |
468 | } | |
f99d49ad JJ |
469 | kfree(interpreter_name); |
470 | kfree(exec_params.phdrs); | |
471 | kfree(exec_params.loadmap); | |
472 | kfree(interp_params.phdrs); | |
473 | kfree(interp_params.loadmap); | |
1da177e4 | 474 | return retval; |
8a2ab7f5 | 475 | } |
1da177e4 LT |
476 | |
477 | /*****************************************************************************/ | |
ec23847d PM |
478 | |
479 | #ifndef ELF_BASE_PLATFORM | |
480 | /* | |
481 | * AT_BASE_PLATFORM indicates the "real" hardware/microarchitecture. | |
482 | * If the arch defines ELF_BASE_PLATFORM (in asm/elf.h), the value | |
483 | * will be copied to the user stack in the same manner as AT_PLATFORM. | |
484 | */ | |
485 | #define ELF_BASE_PLATFORM NULL | |
486 | #endif | |
487 | ||
1da177e4 | 488 | /* |
c7637941 PM |
489 | * present useful information to the program by shovelling it onto the new |
490 | * process's stack | |
1da177e4 LT |
491 | */ |
492 | static int create_elf_fdpic_tables(struct linux_binprm *bprm, | |
493 | struct mm_struct *mm, | |
494 | struct elf_fdpic_params *exec_params, | |
495 | struct elf_fdpic_params *interp_params) | |
496 | { | |
86a264ab | 497 | const struct cred *cred = current_cred(); |
1da177e4 | 498 | unsigned long sp, csp, nitems; |
530018bf | 499 | elf_caddr_t __user *argv, *envp; |
1da177e4 | 500 | size_t platform_len = 0, len; |
ec23847d PM |
501 | char *k_platform, *k_base_platform; |
502 | char __user *u_platform, *u_base_platform, *p; | |
1da177e4 | 503 | int loop; |
9b14ec35 | 504 | int nr; /* reset for each csp adjustment */ |
1da177e4 | 505 | |
1da177e4 | 506 | #ifdef CONFIG_MMU |
c7637941 PM |
507 | /* In some cases (e.g. Hyper-Threading), we want to avoid L1 evictions |
508 | * by the processes running on the same package. One thing we can do is | |
509 | * to shuffle the initial stack for them, so we give the architecture | |
510 | * an opportunity to do so here. | |
511 | */ | |
512 | sp = arch_align_stack(bprm->p); | |
1da177e4 LT |
513 | #else |
514 | sp = mm->start_stack; | |
515 | ||
516 | /* stack the program arguments and environment */ | |
7e7ec6a9 | 517 | if (transfer_args_to_stack(bprm, &sp) < 0) |
1da177e4 | 518 | return -EFAULT; |
7e7ec6a9 | 519 | sp &= ~15; |
1da177e4 LT |
520 | #endif |
521 | ||
ec23847d PM |
522 | /* |
523 | * If this architecture has a platform capability string, copy it | |
524 | * to userspace. In some cases (Sparc), this info is impossible | |
525 | * for userspace to get any other way, in others (i386) it is | |
526 | * merely difficult. | |
527 | */ | |
1da177e4 | 528 | k_platform = ELF_PLATFORM; |
1aeb21d6 | 529 | u_platform = NULL; |
1da177e4 LT |
530 | |
531 | if (k_platform) { | |
532 | platform_len = strlen(k_platform) + 1; | |
533 | sp -= platform_len; | |
530018bf | 534 | u_platform = (char __user *) sp; |
1da177e4 LT |
535 | if (__copy_to_user(u_platform, k_platform, platform_len) != 0) |
536 | return -EFAULT; | |
537 | } | |
538 | ||
ec23847d PM |
539 | /* |
540 | * If this architecture has a "base" platform capability | |
541 | * string, copy it to userspace. | |
542 | */ | |
543 | k_base_platform = ELF_BASE_PLATFORM; | |
544 | u_base_platform = NULL; | |
545 | ||
546 | if (k_base_platform) { | |
547 | platform_len = strlen(k_base_platform) + 1; | |
548 | sp -= platform_len; | |
549 | u_base_platform = (char __user *) sp; | |
550 | if (__copy_to_user(u_base_platform, k_base_platform, platform_len) != 0) | |
551 | return -EFAULT; | |
552 | } | |
553 | ||
1da177e4 LT |
554 | sp &= ~7UL; |
555 | ||
556 | /* stack the load map(s) */ | |
557 | len = sizeof(struct elf32_fdpic_loadmap); | |
558 | len += sizeof(struct elf32_fdpic_loadseg) * exec_params->loadmap->nsegs; | |
559 | sp = (sp - len) & ~7UL; | |
560 | exec_params->map_addr = sp; | |
561 | ||
530018bf | 562 | if (copy_to_user((void __user *) sp, exec_params->loadmap, len) != 0) |
1da177e4 LT |
563 | return -EFAULT; |
564 | ||
565 | current->mm->context.exec_fdpic_loadmap = (unsigned long) sp; | |
566 | ||
567 | if (interp_params->loadmap) { | |
568 | len = sizeof(struct elf32_fdpic_loadmap); | |
8a2ab7f5 DH |
569 | len += sizeof(struct elf32_fdpic_loadseg) * |
570 | interp_params->loadmap->nsegs; | |
1da177e4 LT |
571 | sp = (sp - len) & ~7UL; |
572 | interp_params->map_addr = sp; | |
573 | ||
8a2ab7f5 DH |
574 | if (copy_to_user((void __user *) sp, interp_params->loadmap, |
575 | len) != 0) | |
1da177e4 LT |
576 | return -EFAULT; |
577 | ||
578 | current->mm->context.interp_fdpic_loadmap = (unsigned long) sp; | |
579 | } | |
580 | ||
581 | /* force 16 byte _final_ alignment here for generality */ | |
5edc2a51 | 582 | #define DLINFO_ITEMS 15 |
1da177e4 | 583 | |
ec23847d PM |
584 | nitems = 1 + DLINFO_ITEMS + (k_platform ? 1 : 0) + |
585 | (k_base_platform ? 1 : 0) + AT_VECTOR_SIZE_ARCH; | |
1da177e4 | 586 | |
5edc2a51 PM |
587 | if (bprm->interp_flags & BINPRM_FLAGS_EXECFD) |
588 | nitems++; | |
589 | ||
1da177e4 LT |
590 | csp = sp; |
591 | sp -= nitems * 2 * sizeof(unsigned long); | |
592 | sp -= (bprm->envc + 1) * sizeof(char *); /* envv[] */ | |
593 | sp -= (bprm->argc + 1) * sizeof(char *); /* argv[] */ | |
594 | sp -= 1 * sizeof(unsigned long); /* argc */ | |
595 | ||
596 | csp -= sp & 15UL; | |
597 | sp -= sp & 15UL; | |
598 | ||
599 | /* put the ELF interpreter info on the stack */ | |
9b14ec35 | 600 | #define NEW_AUX_ENT(id, val) \ |
8a2ab7f5 DH |
601 | do { \ |
602 | struct { unsigned long _id, _val; } __user *ent; \ | |
603 | \ | |
604 | ent = (void __user *) csp; \ | |
605 | __put_user((id), &ent[nr]._id); \ | |
606 | __put_user((val), &ent[nr]._val); \ | |
9b14ec35 | 607 | nr++; \ |
1da177e4 LT |
608 | } while (0) |
609 | ||
9b14ec35 | 610 | nr = 0; |
1da177e4 | 611 | csp -= 2 * sizeof(unsigned long); |
9b14ec35 | 612 | NEW_AUX_ENT(AT_NULL, 0); |
1da177e4 | 613 | if (k_platform) { |
9b14ec35 | 614 | nr = 0; |
1da177e4 | 615 | csp -= 2 * sizeof(unsigned long); |
9b14ec35 | 616 | NEW_AUX_ENT(AT_PLATFORM, |
8a2ab7f5 | 617 | (elf_addr_t) (unsigned long) u_platform); |
1da177e4 LT |
618 | } |
619 | ||
ec23847d PM |
620 | if (k_base_platform) { |
621 | nr = 0; | |
622 | csp -= 2 * sizeof(unsigned long); | |
623 | NEW_AUX_ENT(AT_BASE_PLATFORM, | |
624 | (elf_addr_t) (unsigned long) u_base_platform); | |
625 | } | |
626 | ||
5edc2a51 PM |
627 | if (bprm->interp_flags & BINPRM_FLAGS_EXECFD) { |
628 | nr = 0; | |
629 | csp -= 2 * sizeof(unsigned long); | |
630 | NEW_AUX_ENT(AT_EXECFD, bprm->interp_data); | |
631 | } | |
632 | ||
9b14ec35 | 633 | nr = 0; |
1da177e4 | 634 | csp -= DLINFO_ITEMS * 2 * sizeof(unsigned long); |
2171364d MN |
635 | NEW_AUX_ENT(AT_HWCAP, ELF_HWCAP); |
636 | #ifdef ELF_HWCAP2 | |
637 | NEW_AUX_ENT(AT_HWCAP2, ELF_HWCAP2); | |
638 | #endif | |
9b14ec35 PM |
639 | NEW_AUX_ENT(AT_PAGESZ, PAGE_SIZE); |
640 | NEW_AUX_ENT(AT_CLKTCK, CLOCKS_PER_SEC); | |
641 | NEW_AUX_ENT(AT_PHDR, exec_params->ph_addr); | |
642 | NEW_AUX_ENT(AT_PHENT, sizeof(struct elf_phdr)); | |
643 | NEW_AUX_ENT(AT_PHNUM, exec_params->hdr.e_phnum); | |
644 | NEW_AUX_ENT(AT_BASE, interp_params->elfhdr_addr); | |
645 | NEW_AUX_ENT(AT_FLAGS, 0); | |
646 | NEW_AUX_ENT(AT_ENTRY, exec_params->entry_addr); | |
ebc887b2 EB |
647 | NEW_AUX_ENT(AT_UID, (elf_addr_t) from_kuid_munged(cred->user_ns, cred->uid)); |
648 | NEW_AUX_ENT(AT_EUID, (elf_addr_t) from_kuid_munged(cred->user_ns, cred->euid)); | |
649 | NEW_AUX_ENT(AT_GID, (elf_addr_t) from_kgid_munged(cred->user_ns, cred->gid)); | |
650 | NEW_AUX_ENT(AT_EGID, (elf_addr_t) from_kgid_munged(cred->user_ns, cred->egid)); | |
5edc2a51 PM |
651 | NEW_AUX_ENT(AT_SECURE, security_bprm_secureexec(bprm)); |
652 | NEW_AUX_ENT(AT_EXECFN, bprm->exec); | |
1da177e4 LT |
653 | |
654 | #ifdef ARCH_DLINFO | |
9b14ec35 PM |
655 | nr = 0; |
656 | csp -= AT_VECTOR_SIZE_ARCH * 2 * sizeof(unsigned long); | |
657 | ||
1da177e4 LT |
658 | /* ARCH_DLINFO must come last so platform specific code can enforce |
659 | * special alignment requirements on the AUXV if necessary (eg. PPC). | |
660 | */ | |
661 | ARCH_DLINFO; | |
662 | #endif | |
663 | #undef NEW_AUX_ENT | |
664 | ||
665 | /* allocate room for argv[] and envv[] */ | |
666 | csp -= (bprm->envc + 1) * sizeof(elf_caddr_t); | |
530018bf | 667 | envp = (elf_caddr_t __user *) csp; |
1da177e4 | 668 | csp -= (bprm->argc + 1) * sizeof(elf_caddr_t); |
530018bf | 669 | argv = (elf_caddr_t __user *) csp; |
1da177e4 LT |
670 | |
671 | /* stack argc */ | |
672 | csp -= sizeof(unsigned long); | |
530018bf | 673 | __put_user(bprm->argc, (unsigned long __user *) csp); |
1da177e4 | 674 | |
88bcd512 | 675 | BUG_ON(csp != sp); |
1da177e4 LT |
676 | |
677 | /* fill in the argv[] array */ | |
678 | #ifdef CONFIG_MMU | |
679 | current->mm->arg_start = bprm->p; | |
680 | #else | |
8a2ab7f5 DH |
681 | current->mm->arg_start = current->mm->start_stack - |
682 | (MAX_ARG_PAGES * PAGE_SIZE - bprm->p); | |
1da177e4 LT |
683 | #endif |
684 | ||
530018bf | 685 | p = (char __user *) current->mm->arg_start; |
1da177e4 LT |
686 | for (loop = bprm->argc; loop > 0; loop--) { |
687 | __put_user((elf_caddr_t) p, argv++); | |
b6a2fea3 OW |
688 | len = strnlen_user(p, MAX_ARG_STRLEN); |
689 | if (!len || len > MAX_ARG_STRLEN) | |
1da177e4 LT |
690 | return -EINVAL; |
691 | p += len; | |
692 | } | |
693 | __put_user(NULL, argv); | |
694 | current->mm->arg_end = (unsigned long) p; | |
695 | ||
696 | /* fill in the envv[] array */ | |
697 | current->mm->env_start = (unsigned long) p; | |
698 | for (loop = bprm->envc; loop > 0; loop--) { | |
699 | __put_user((elf_caddr_t)(unsigned long) p, envp++); | |
b6a2fea3 OW |
700 | len = strnlen_user(p, MAX_ARG_STRLEN); |
701 | if (!len || len > MAX_ARG_STRLEN) | |
1da177e4 LT |
702 | return -EINVAL; |
703 | p += len; | |
704 | } | |
705 | __put_user(NULL, envp); | |
706 | current->mm->env_end = (unsigned long) p; | |
707 | ||
708 | mm->start_stack = (unsigned long) sp; | |
709 | return 0; | |
8a2ab7f5 | 710 | } |
1da177e4 LT |
711 | |
712 | /*****************************************************************************/ | |
1da177e4 LT |
713 | /* |
714 | * load the appropriate binary image (executable or interpreter) into memory | |
715 | * - we assume no MMU is available | |
716 | * - if no other PIC bits are set in params->hdr->e_flags | |
717 | * - we assume that the LOADable segments in the binary are independently relocatable | |
718 | * - we assume R/O executable segments are shareable | |
719 | * - else | |
720 | * - we assume the loadable parts of the image to require fixed displacement | |
721 | * - the image is not shareable | |
722 | */ | |
723 | static int elf_fdpic_map_file(struct elf_fdpic_params *params, | |
724 | struct file *file, | |
725 | struct mm_struct *mm, | |
726 | const char *what) | |
727 | { | |
728 | struct elf32_fdpic_loadmap *loadmap; | |
729 | #ifdef CONFIG_MMU | |
730 | struct elf32_fdpic_loadseg *mseg; | |
731 | #endif | |
732 | struct elf32_fdpic_loadseg *seg; | |
733 | struct elf32_phdr *phdr; | |
734 | unsigned long load_addr, stop; | |
735 | unsigned nloads, tmp; | |
736 | size_t size; | |
737 | int loop, ret; | |
738 | ||
739 | /* allocate a load map table */ | |
740 | nloads = 0; | |
741 | for (loop = 0; loop < params->hdr.e_phnum; loop++) | |
742 | if (params->phdrs[loop].p_type == PT_LOAD) | |
743 | nloads++; | |
744 | ||
745 | if (nloads == 0) | |
746 | return -ELIBBAD; | |
747 | ||
748 | size = sizeof(*loadmap) + nloads * sizeof(*seg); | |
b87576d5 | 749 | loadmap = kzalloc(size, GFP_KERNEL); |
1da177e4 LT |
750 | if (!loadmap) |
751 | return -ENOMEM; | |
752 | ||
753 | params->loadmap = loadmap; | |
1da177e4 LT |
754 | |
755 | loadmap->version = ELF32_FDPIC_LOADMAP_VERSION; | |
756 | loadmap->nsegs = nloads; | |
757 | ||
758 | load_addr = params->load_addr; | |
759 | seg = loadmap->segs; | |
760 | ||
761 | /* map the requested LOADs into the memory space */ | |
762 | switch (params->flags & ELF_FDPIC_FLAG_ARRANGEMENT) { | |
763 | case ELF_FDPIC_FLAG_CONSTDISP: | |
764 | case ELF_FDPIC_FLAG_CONTIGUOUS: | |
765 | #ifndef CONFIG_MMU | |
766 | ret = elf_fdpic_map_file_constdisp_on_uclinux(params, file, mm); | |
767 | if (ret < 0) | |
768 | return ret; | |
769 | break; | |
770 | #endif | |
771 | default: | |
772 | ret = elf_fdpic_map_file_by_direct_mmap(params, file, mm); | |
773 | if (ret < 0) | |
774 | return ret; | |
775 | break; | |
776 | } | |
777 | ||
778 | /* map the entry point */ | |
779 | if (params->hdr.e_entry) { | |
780 | seg = loadmap->segs; | |
781 | for (loop = loadmap->nsegs; loop > 0; loop--, seg++) { | |
782 | if (params->hdr.e_entry >= seg->p_vaddr && | |
8a2ab7f5 | 783 | params->hdr.e_entry < seg->p_vaddr + seg->p_memsz) { |
1da177e4 | 784 | params->entry_addr = |
8a2ab7f5 DH |
785 | (params->hdr.e_entry - seg->p_vaddr) + |
786 | seg->addr; | |
1da177e4 LT |
787 | break; |
788 | } | |
789 | } | |
790 | } | |
791 | ||
792 | /* determine where the program header table has wound up if mapped */ | |
8a2ab7f5 DH |
793 | stop = params->hdr.e_phoff; |
794 | stop += params->hdr.e_phnum * sizeof (struct elf_phdr); | |
1da177e4 LT |
795 | phdr = params->phdrs; |
796 | ||
797 | for (loop = 0; loop < params->hdr.e_phnum; loop++, phdr++) { | |
798 | if (phdr->p_type != PT_LOAD) | |
799 | continue; | |
800 | ||
801 | if (phdr->p_offset > params->hdr.e_phoff || | |
802 | phdr->p_offset + phdr->p_filesz < stop) | |
803 | continue; | |
804 | ||
805 | seg = loadmap->segs; | |
806 | for (loop = loadmap->nsegs; loop > 0; loop--, seg++) { | |
807 | if (phdr->p_vaddr >= seg->p_vaddr && | |
8a2ab7f5 DH |
808 | phdr->p_vaddr + phdr->p_filesz <= |
809 | seg->p_vaddr + seg->p_memsz) { | |
810 | params->ph_addr = | |
811 | (phdr->p_vaddr - seg->p_vaddr) + | |
812 | seg->addr + | |
1da177e4 LT |
813 | params->hdr.e_phoff - phdr->p_offset; |
814 | break; | |
815 | } | |
816 | } | |
817 | break; | |
818 | } | |
819 | ||
820 | /* determine where the dynamic section has wound up if there is one */ | |
821 | phdr = params->phdrs; | |
822 | for (loop = 0; loop < params->hdr.e_phnum; loop++, phdr++) { | |
823 | if (phdr->p_type != PT_DYNAMIC) | |
824 | continue; | |
825 | ||
826 | seg = loadmap->segs; | |
827 | for (loop = loadmap->nsegs; loop > 0; loop--, seg++) { | |
828 | if (phdr->p_vaddr >= seg->p_vaddr && | |
8a2ab7f5 DH |
829 | phdr->p_vaddr + phdr->p_memsz <= |
830 | seg->p_vaddr + seg->p_memsz) { | |
831 | params->dynamic_addr = | |
832 | (phdr->p_vaddr - seg->p_vaddr) + | |
833 | seg->addr; | |
834 | ||
835 | /* check the dynamic section contains at least | |
836 | * one item, and that the last item is a NULL | |
837 | * entry */ | |
1da177e4 LT |
838 | if (phdr->p_memsz == 0 || |
839 | phdr->p_memsz % sizeof(Elf32_Dyn) != 0) | |
840 | goto dynamic_error; | |
841 | ||
842 | tmp = phdr->p_memsz / sizeof(Elf32_Dyn); | |
8a2ab7f5 DH |
843 | if (((Elf32_Dyn *) |
844 | params->dynamic_addr)[tmp - 1].d_tag != 0) | |
1da177e4 LT |
845 | goto dynamic_error; |
846 | break; | |
847 | } | |
848 | } | |
849 | break; | |
850 | } | |
851 | ||
852 | /* now elide adjacent segments in the load map on MMU linux | |
8a2ab7f5 DH |
853 | * - on uClinux the holes between may actually be filled with system |
854 | * stuff or stuff from other processes | |
1da177e4 LT |
855 | */ |
856 | #ifdef CONFIG_MMU | |
857 | nloads = loadmap->nsegs; | |
858 | mseg = loadmap->segs; | |
859 | seg = mseg + 1; | |
860 | for (loop = 1; loop < nloads; loop++) { | |
861 | /* see if we have a candidate for merging */ | |
862 | if (seg->p_vaddr - mseg->p_vaddr == seg->addr - mseg->addr) { | |
863 | load_addr = PAGE_ALIGN(mseg->addr + mseg->p_memsz); | |
864 | if (load_addr == (seg->addr & PAGE_MASK)) { | |
8a2ab7f5 DH |
865 | mseg->p_memsz += |
866 | load_addr - | |
867 | (mseg->addr + mseg->p_memsz); | |
1da177e4 LT |
868 | mseg->p_memsz += seg->addr & ~PAGE_MASK; |
869 | mseg->p_memsz += seg->p_memsz; | |
870 | loadmap->nsegs--; | |
871 | continue; | |
872 | } | |
873 | } | |
874 | ||
875 | mseg++; | |
876 | if (mseg != seg) | |
877 | *mseg = *seg; | |
878 | } | |
879 | #endif | |
880 | ||
881 | kdebug("Mapped Object [%s]:", what); | |
882 | kdebug("- elfhdr : %lx", params->elfhdr_addr); | |
883 | kdebug("- entry : %lx", params->entry_addr); | |
884 | kdebug("- PHDR[] : %lx", params->ph_addr); | |
885 | kdebug("- DYNAMIC[]: %lx", params->dynamic_addr); | |
886 | seg = loadmap->segs; | |
887 | for (loop = 0; loop < loadmap->nsegs; loop++, seg++) | |
888 | kdebug("- LOAD[%d] : %08x-%08x [va=%x ms=%x]", | |
889 | loop, | |
890 | seg->addr, seg->addr + seg->p_memsz - 1, | |
891 | seg->p_vaddr, seg->p_memsz); | |
892 | ||
893 | return 0; | |
894 | ||
8a2ab7f5 | 895 | dynamic_error: |
1da177e4 | 896 | printk("ELF FDPIC %s with invalid DYNAMIC section (inode=%lu)\n", |
496ad9aa | 897 | what, file_inode(file)->i_ino); |
1da177e4 | 898 | return -ELIBBAD; |
8a2ab7f5 | 899 | } |
1da177e4 LT |
900 | |
901 | /*****************************************************************************/ | |
902 | /* | |
903 | * map a file with constant displacement under uClinux | |
904 | */ | |
905 | #ifndef CONFIG_MMU | |
8a2ab7f5 DH |
906 | static int elf_fdpic_map_file_constdisp_on_uclinux( |
907 | struct elf_fdpic_params *params, | |
908 | struct file *file, | |
909 | struct mm_struct *mm) | |
1da177e4 LT |
910 | { |
911 | struct elf32_fdpic_loadseg *seg; | |
912 | struct elf32_phdr *phdr; | |
913 | unsigned long load_addr, base = ULONG_MAX, top = 0, maddr = 0, mflags; | |
1da177e4 LT |
914 | int loop, ret; |
915 | ||
916 | load_addr = params->load_addr; | |
917 | seg = params->loadmap->segs; | |
918 | ||
8a2ab7f5 DH |
919 | /* determine the bounds of the contiguous overall allocation we must |
920 | * make */ | |
1da177e4 LT |
921 | phdr = params->phdrs; |
922 | for (loop = 0; loop < params->hdr.e_phnum; loop++, phdr++) { | |
923 | if (params->phdrs[loop].p_type != PT_LOAD) | |
924 | continue; | |
925 | ||
926 | if (base > phdr->p_vaddr) | |
927 | base = phdr->p_vaddr; | |
928 | if (top < phdr->p_vaddr + phdr->p_memsz) | |
929 | top = phdr->p_vaddr + phdr->p_memsz; | |
930 | } | |
931 | ||
932 | /* allocate one big anon block for everything */ | |
933 | mflags = MAP_PRIVATE; | |
934 | if (params->flags & ELF_FDPIC_FLAG_EXECUTABLE) | |
935 | mflags |= MAP_EXECUTABLE; | |
936 | ||
6be5ceb0 | 937 | maddr = vm_mmap(NULL, load_addr, top - base, |
1da177e4 | 938 | PROT_READ | PROT_WRITE | PROT_EXEC, mflags, 0); |
8a2ab7f5 | 939 | if (IS_ERR_VALUE(maddr)) |
1da177e4 LT |
940 | return (int) maddr; |
941 | ||
942 | if (load_addr != 0) | |
943 | load_addr += PAGE_ALIGN(top - base); | |
944 | ||
945 | /* and then load the file segments into it */ | |
946 | phdr = params->phdrs; | |
947 | for (loop = 0; loop < params->hdr.e_phnum; loop++, phdr++) { | |
948 | if (params->phdrs[loop].p_type != PT_LOAD) | |
949 | continue; | |
950 | ||
1da177e4 LT |
951 | seg->addr = maddr + (phdr->p_vaddr - base); |
952 | seg->p_vaddr = phdr->p_vaddr; | |
953 | seg->p_memsz = phdr->p_memsz; | |
954 | ||
3dc20cb2 AV |
955 | ret = read_code(file, seg->addr, phdr->p_offset, |
956 | phdr->p_filesz); | |
1da177e4 LT |
957 | if (ret < 0) |
958 | return ret; | |
959 | ||
960 | /* map the ELF header address if in this segment */ | |
961 | if (phdr->p_offset == 0) | |
962 | params->elfhdr_addr = seg->addr; | |
963 | ||
964 | /* clear any space allocated but not loaded */ | |
ab4ad555 | 965 | if (phdr->p_filesz < phdr->p_memsz) { |
e30c7c3b TY |
966 | if (clear_user((void *) (seg->addr + phdr->p_filesz), |
967 | phdr->p_memsz - phdr->p_filesz)) | |
968 | return -EFAULT; | |
ab4ad555 | 969 | } |
1da177e4 LT |
970 | |
971 | if (mm) { | |
972 | if (phdr->p_flags & PF_X) { | |
aa289b47 DH |
973 | if (!mm->start_code) { |
974 | mm->start_code = seg->addr; | |
975 | mm->end_code = seg->addr + | |
976 | phdr->p_memsz; | |
977 | } | |
8a2ab7f5 | 978 | } else if (!mm->start_data) { |
1da177e4 | 979 | mm->start_data = seg->addr; |
1da177e4 | 980 | mm->end_data = seg->addr + phdr->p_memsz; |
1da177e4 | 981 | } |
1da177e4 LT |
982 | } |
983 | ||
984 | seg++; | |
985 | } | |
986 | ||
987 | return 0; | |
8a2ab7f5 | 988 | } |
1da177e4 LT |
989 | #endif |
990 | ||
991 | /*****************************************************************************/ | |
992 | /* | |
993 | * map a binary by direct mmap() of the individual PT_LOAD segments | |
994 | */ | |
995 | static int elf_fdpic_map_file_by_direct_mmap(struct elf_fdpic_params *params, | |
996 | struct file *file, | |
997 | struct mm_struct *mm) | |
998 | { | |
999 | struct elf32_fdpic_loadseg *seg; | |
1000 | struct elf32_phdr *phdr; | |
1001 | unsigned long load_addr, delta_vaddr; | |
e30c7c3b | 1002 | int loop, dvset; |
1da177e4 LT |
1003 | |
1004 | load_addr = params->load_addr; | |
1005 | delta_vaddr = 0; | |
1006 | dvset = 0; | |
1007 | ||
1008 | seg = params->loadmap->segs; | |
1009 | ||
1010 | /* deal with each load segment separately */ | |
1011 | phdr = params->phdrs; | |
1012 | for (loop = 0; loop < params->hdr.e_phnum; loop++, phdr++) { | |
1013 | unsigned long maddr, disp, excess, excess1; | |
1014 | int prot = 0, flags; | |
1015 | ||
1016 | if (phdr->p_type != PT_LOAD) | |
1017 | continue; | |
1018 | ||
1019 | kdebug("[LOAD] va=%lx of=%lx fs=%lx ms=%lx", | |
1020 | (unsigned long) phdr->p_vaddr, | |
1021 | (unsigned long) phdr->p_offset, | |
1022 | (unsigned long) phdr->p_filesz, | |
1023 | (unsigned long) phdr->p_memsz); | |
1024 | ||
1025 | /* determine the mapping parameters */ | |
1026 | if (phdr->p_flags & PF_R) prot |= PROT_READ; | |
1027 | if (phdr->p_flags & PF_W) prot |= PROT_WRITE; | |
1028 | if (phdr->p_flags & PF_X) prot |= PROT_EXEC; | |
1029 | ||
1030 | flags = MAP_PRIVATE | MAP_DENYWRITE; | |
1031 | if (params->flags & ELF_FDPIC_FLAG_EXECUTABLE) | |
1032 | flags |= MAP_EXECUTABLE; | |
1033 | ||
1034 | maddr = 0; | |
1035 | ||
1036 | switch (params->flags & ELF_FDPIC_FLAG_ARRANGEMENT) { | |
1037 | case ELF_FDPIC_FLAG_INDEPENDENT: | |
1038 | /* PT_LOADs are independently locatable */ | |
1039 | break; | |
1040 | ||
1041 | case ELF_FDPIC_FLAG_HONOURVADDR: | |
1042 | /* the specified virtual address must be honoured */ | |
1043 | maddr = phdr->p_vaddr; | |
1044 | flags |= MAP_FIXED; | |
1045 | break; | |
1046 | ||
1047 | case ELF_FDPIC_FLAG_CONSTDISP: | |
1048 | /* constant displacement | |
8a2ab7f5 DH |
1049 | * - can be mapped anywhere, but must be mapped as a |
1050 | * unit | |
1da177e4 LT |
1051 | */ |
1052 | if (!dvset) { | |
1053 | maddr = load_addr; | |
1054 | delta_vaddr = phdr->p_vaddr; | |
1055 | dvset = 1; | |
8a2ab7f5 | 1056 | } else { |
1da177e4 LT |
1057 | maddr = load_addr + phdr->p_vaddr - delta_vaddr; |
1058 | flags |= MAP_FIXED; | |
1059 | } | |
1060 | break; | |
1061 | ||
1062 | case ELF_FDPIC_FLAG_CONTIGUOUS: | |
1063 | /* contiguity handled later */ | |
1064 | break; | |
1065 | ||
1066 | default: | |
1067 | BUG(); | |
1068 | } | |
1069 | ||
1070 | maddr &= PAGE_MASK; | |
1071 | ||
1072 | /* create the mapping */ | |
1073 | disp = phdr->p_vaddr & ~PAGE_MASK; | |
6be5ceb0 | 1074 | maddr = vm_mmap(file, maddr, phdr->p_memsz + disp, prot, flags, |
1da177e4 | 1075 | phdr->p_offset - disp); |
1da177e4 LT |
1076 | |
1077 | kdebug("mmap[%d] <file> sz=%lx pr=%x fl=%x of=%lx --> %08lx", | |
8a2ab7f5 DH |
1078 | loop, phdr->p_memsz + disp, prot, flags, |
1079 | phdr->p_offset - disp, maddr); | |
1da177e4 | 1080 | |
8a2ab7f5 | 1081 | if (IS_ERR_VALUE(maddr)) |
1da177e4 LT |
1082 | return (int) maddr; |
1083 | ||
8a2ab7f5 DH |
1084 | if ((params->flags & ELF_FDPIC_FLAG_ARRANGEMENT) == |
1085 | ELF_FDPIC_FLAG_CONTIGUOUS) | |
1da177e4 LT |
1086 | load_addr += PAGE_ALIGN(phdr->p_memsz + disp); |
1087 | ||
1088 | seg->addr = maddr + disp; | |
1089 | seg->p_vaddr = phdr->p_vaddr; | |
1090 | seg->p_memsz = phdr->p_memsz; | |
1091 | ||
1092 | /* map the ELF header address if in this segment */ | |
1093 | if (phdr->p_offset == 0) | |
1094 | params->elfhdr_addr = seg->addr; | |
1095 | ||
8a2ab7f5 DH |
1096 | /* clear the bit between beginning of mapping and beginning of |
1097 | * PT_LOAD */ | |
1da177e4 LT |
1098 | if (prot & PROT_WRITE && disp > 0) { |
1099 | kdebug("clear[%d] ad=%lx sz=%lx", loop, maddr, disp); | |
e30c7c3b TY |
1100 | if (clear_user((void __user *) maddr, disp)) |
1101 | return -EFAULT; | |
1da177e4 LT |
1102 | maddr += disp; |
1103 | } | |
1104 | ||
1105 | /* clear any space allocated but not loaded | |
1106 | * - on uClinux we can just clear the lot | |
1107 | * - on MMU linux we'll get a SIGBUS beyond the last page | |
1108 | * extant in the file | |
1109 | */ | |
1110 | excess = phdr->p_memsz - phdr->p_filesz; | |
1111 | excess1 = PAGE_SIZE - ((maddr + phdr->p_filesz) & ~PAGE_MASK); | |
1112 | ||
1113 | #ifdef CONFIG_MMU | |
1da177e4 LT |
1114 | if (excess > excess1) { |
1115 | unsigned long xaddr = maddr + phdr->p_filesz + excess1; | |
1116 | unsigned long xmaddr; | |
1117 | ||
1118 | flags |= MAP_FIXED | MAP_ANONYMOUS; | |
6be5ceb0 | 1119 | xmaddr = vm_mmap(NULL, xaddr, excess - excess1, |
8a2ab7f5 | 1120 | prot, flags, 0); |
1da177e4 LT |
1121 | |
1122 | kdebug("mmap[%d] <anon>" | |
1123 | " ad=%lx sz=%lx pr=%x fl=%x of=0 --> %08lx", | |
8a2ab7f5 DH |
1124 | loop, xaddr, excess - excess1, prot, flags, |
1125 | xmaddr); | |
1da177e4 LT |
1126 | |
1127 | if (xmaddr != xaddr) | |
1128 | return -ENOMEM; | |
1129 | } | |
1130 | ||
1131 | if (prot & PROT_WRITE && excess1 > 0) { | |
1132 | kdebug("clear[%d] ad=%lx sz=%lx", | |
1133 | loop, maddr + phdr->p_filesz, excess1); | |
e30c7c3b TY |
1134 | if (clear_user((void __user *) maddr + phdr->p_filesz, |
1135 | excess1)) | |
1136 | return -EFAULT; | |
1da177e4 LT |
1137 | } |
1138 | ||
1139 | #else | |
1140 | if (excess > 0) { | |
1141 | kdebug("clear[%d] ad=%lx sz=%lx", | |
1142 | loop, maddr + phdr->p_filesz, excess); | |
e30c7c3b TY |
1143 | if (clear_user((void *) maddr + phdr->p_filesz, excess)) |
1144 | return -EFAULT; | |
1da177e4 LT |
1145 | } |
1146 | #endif | |
1147 | ||
1148 | if (mm) { | |
1149 | if (phdr->p_flags & PF_X) { | |
aa289b47 DH |
1150 | if (!mm->start_code) { |
1151 | mm->start_code = maddr; | |
1152 | mm->end_code = maddr + phdr->p_memsz; | |
1153 | } | |
8a2ab7f5 | 1154 | } else if (!mm->start_data) { |
1da177e4 LT |
1155 | mm->start_data = maddr; |
1156 | mm->end_data = maddr + phdr->p_memsz; | |
1157 | } | |
1158 | } | |
1159 | ||
1160 | seg++; | |
1161 | } | |
1162 | ||
1163 | return 0; | |
8a2ab7f5 | 1164 | } |
6d8c4e3b DH |
1165 | |
1166 | /*****************************************************************************/ | |
1167 | /* | |
1168 | * ELF-FDPIC core dumper | |
1169 | * | |
1170 | * Modelled on fs/exec.c:aout_core_dump() | |
1171 | * Jeremy Fitzhardinge <jeremy@sw.oz.au> | |
1172 | * | |
1173 | * Modelled on fs/binfmt_elf.c core dumper | |
1174 | */ | |
698ba7b5 | 1175 | #ifdef CONFIG_ELF_CORE |
6d8c4e3b | 1176 | |
6d8c4e3b DH |
1177 | /* |
1178 | * Decide whether a segment is worth dumping; default is yes to be | |
1179 | * sure (missing info is worse than too much; etc). | |
1180 | * Personally I'd include everything, and use the coredump limit... | |
1181 | * | |
1182 | * I think we should skip something. But I am not sure how. H.J. | |
1183 | */ | |
ee78b0a6 | 1184 | static int maydump(struct vm_area_struct *vma, unsigned long mm_flags) |
6d8c4e3b | 1185 | { |
ee78b0a6 KH |
1186 | int dump_ok; |
1187 | ||
6d8c4e3b | 1188 | /* Do not dump I/O mapped devices or special mappings */ |
314e51b9 | 1189 | if (vma->vm_flags & VM_IO) { |
6d8c4e3b DH |
1190 | kdcore("%08lx: %08lx: no (IO)", vma->vm_start, vma->vm_flags); |
1191 | return 0; | |
1192 | } | |
1193 | ||
1194 | /* If we may not read the contents, don't allow us to dump | |
1195 | * them either. "dump_write()" can't handle it anyway. | |
1196 | */ | |
1197 | if (!(vma->vm_flags & VM_READ)) { | |
1198 | kdcore("%08lx: %08lx: no (!read)", vma->vm_start, vma->vm_flags); | |
1199 | return 0; | |
1200 | } | |
1201 | ||
ab27a8d0 RZ |
1202 | /* support for DAX */ |
1203 | if (vma_is_dax(vma)) { | |
1204 | if (vma->vm_flags & VM_SHARED) { | |
1205 | dump_ok = test_bit(MMF_DUMP_DAX_SHARED, &mm_flags); | |
1206 | kdcore("%08lx: %08lx: %s (DAX shared)", vma->vm_start, | |
1207 | vma->vm_flags, dump_ok ? "yes" : "no"); | |
1208 | } else { | |
1209 | dump_ok = test_bit(MMF_DUMP_DAX_PRIVATE, &mm_flags); | |
1210 | kdcore("%08lx: %08lx: %s (DAX private)", vma->vm_start, | |
1211 | vma->vm_flags, dump_ok ? "yes" : "no"); | |
1212 | } | |
1213 | return dump_ok; | |
1214 | } | |
1215 | ||
ee78b0a6 | 1216 | /* By default, dump shared memory if mapped from an anonymous file. */ |
6d8c4e3b | 1217 | if (vma->vm_flags & VM_SHARED) { |
496ad9aa | 1218 | if (file_inode(vma->vm_file)->i_nlink == 0) { |
ee78b0a6 KH |
1219 | dump_ok = test_bit(MMF_DUMP_ANON_SHARED, &mm_flags); |
1220 | kdcore("%08lx: %08lx: %s (share)", vma->vm_start, | |
1221 | vma->vm_flags, dump_ok ? "yes" : "no"); | |
1222 | return dump_ok; | |
6d8c4e3b DH |
1223 | } |
1224 | ||
ee78b0a6 KH |
1225 | dump_ok = test_bit(MMF_DUMP_MAPPED_SHARED, &mm_flags); |
1226 | kdcore("%08lx: %08lx: %s (share)", vma->vm_start, | |
1227 | vma->vm_flags, dump_ok ? "yes" : "no"); | |
1228 | return dump_ok; | |
6d8c4e3b DH |
1229 | } |
1230 | ||
1231 | #ifdef CONFIG_MMU | |
ee78b0a6 | 1232 | /* By default, if it hasn't been written to, don't write it out */ |
6d8c4e3b | 1233 | if (!vma->anon_vma) { |
ee78b0a6 KH |
1234 | dump_ok = test_bit(MMF_DUMP_MAPPED_PRIVATE, &mm_flags); |
1235 | kdcore("%08lx: %08lx: %s (!anon)", vma->vm_start, | |
1236 | vma->vm_flags, dump_ok ? "yes" : "no"); | |
1237 | return dump_ok; | |
6d8c4e3b DH |
1238 | } |
1239 | #endif | |
1240 | ||
ee78b0a6 KH |
1241 | dump_ok = test_bit(MMF_DUMP_ANON_PRIVATE, &mm_flags); |
1242 | kdcore("%08lx: %08lx: %s", vma->vm_start, vma->vm_flags, | |
1243 | dump_ok ? "yes" : "no"); | |
1244 | return dump_ok; | |
6d8c4e3b DH |
1245 | } |
1246 | ||
1247 | /* An ELF note in memory */ | |
1248 | struct memelfnote | |
1249 | { | |
1250 | const char *name; | |
1251 | int type; | |
1252 | unsigned int datasz; | |
1253 | void *data; | |
1254 | }; | |
1255 | ||
1256 | static int notesize(struct memelfnote *en) | |
1257 | { | |
1258 | int sz; | |
1259 | ||
1260 | sz = sizeof(struct elf_note); | |
1261 | sz += roundup(strlen(en->name) + 1, 4); | |
1262 | sz += roundup(en->datasz, 4); | |
1263 | ||
1264 | return sz; | |
1265 | } | |
1266 | ||
1267 | /* #define DEBUG */ | |
1268 | ||
e6c1baa9 | 1269 | static int writenote(struct memelfnote *men, struct coredump_params *cprm) |
05f47fda DH |
1270 | { |
1271 | struct elf_note en; | |
6d8c4e3b DH |
1272 | en.n_namesz = strlen(men->name) + 1; |
1273 | en.n_descsz = men->datasz; | |
1274 | en.n_type = men->type; | |
1275 | ||
e6c1baa9 | 1276 | return dump_emit(cprm, &en, sizeof(en)) && |
22a8cb82 AV |
1277 | dump_emit(cprm, men->name, en.n_namesz) && dump_align(cprm, 4) && |
1278 | dump_emit(cprm, men->data, men->datasz) && dump_align(cprm, 4); | |
6d8c4e3b | 1279 | } |
6d8c4e3b | 1280 | |
6d8c4e3b DH |
1281 | static inline void fill_elf_fdpic_header(struct elfhdr *elf, int segs) |
1282 | { | |
1283 | memcpy(elf->e_ident, ELFMAG, SELFMAG); | |
1284 | elf->e_ident[EI_CLASS] = ELF_CLASS; | |
1285 | elf->e_ident[EI_DATA] = ELF_DATA; | |
1286 | elf->e_ident[EI_VERSION] = EV_CURRENT; | |
1287 | elf->e_ident[EI_OSABI] = ELF_OSABI; | |
1288 | memset(elf->e_ident+EI_PAD, 0, EI_NIDENT-EI_PAD); | |
1289 | ||
1290 | elf->e_type = ET_CORE; | |
1291 | elf->e_machine = ELF_ARCH; | |
1292 | elf->e_version = EV_CURRENT; | |
1293 | elf->e_entry = 0; | |
1294 | elf->e_phoff = sizeof(struct elfhdr); | |
1295 | elf->e_shoff = 0; | |
1296 | elf->e_flags = ELF_FDPIC_CORE_EFLAGS; | |
1297 | elf->e_ehsize = sizeof(struct elfhdr); | |
1298 | elf->e_phentsize = sizeof(struct elf_phdr); | |
1299 | elf->e_phnum = segs; | |
1300 | elf->e_shentsize = 0; | |
1301 | elf->e_shnum = 0; | |
1302 | elf->e_shstrndx = 0; | |
1303 | return; | |
1304 | } | |
1305 | ||
1306 | static inline void fill_elf_note_phdr(struct elf_phdr *phdr, int sz, loff_t offset) | |
1307 | { | |
1308 | phdr->p_type = PT_NOTE; | |
1309 | phdr->p_offset = offset; | |
1310 | phdr->p_vaddr = 0; | |
1311 | phdr->p_paddr = 0; | |
1312 | phdr->p_filesz = sz; | |
1313 | phdr->p_memsz = 0; | |
1314 | phdr->p_flags = 0; | |
1315 | phdr->p_align = 0; | |
1316 | return; | |
1317 | } | |
1318 | ||
1319 | static inline void fill_note(struct memelfnote *note, const char *name, int type, | |
1320 | unsigned int sz, void *data) | |
1321 | { | |
1322 | note->name = name; | |
1323 | note->type = type; | |
1324 | note->datasz = sz; | |
1325 | note->data = data; | |
1326 | return; | |
1327 | } | |
1328 | ||
1329 | /* | |
1330 | * fill up all the fields in prstatus from the given task struct, except | |
3ad2f3fb | 1331 | * registers which need to be filled up separately. |
6d8c4e3b DH |
1332 | */ |
1333 | static void fill_prstatus(struct elf_prstatus *prstatus, | |
1334 | struct task_struct *p, long signr) | |
1335 | { | |
1336 | prstatus->pr_info.si_signo = prstatus->pr_cursig = signr; | |
1337 | prstatus->pr_sigpend = p->pending.signal.sig[0]; | |
1338 | prstatus->pr_sighold = p->blocked.sig[0]; | |
3b34fc58 ON |
1339 | rcu_read_lock(); |
1340 | prstatus->pr_ppid = task_pid_vnr(rcu_dereference(p->real_parent)); | |
1341 | rcu_read_unlock(); | |
b488893a | 1342 | prstatus->pr_pid = task_pid_vnr(p); |
b488893a PE |
1343 | prstatus->pr_pgrp = task_pgrp_vnr(p); |
1344 | prstatus->pr_sid = task_session_vnr(p); | |
6d8c4e3b | 1345 | if (thread_group_leader(p)) { |
cd19c364 | 1346 | struct task_cputime cputime; |
2515ddc6 | 1347 | |
6d8c4e3b | 1348 | /* |
2515ddc6 PM |
1349 | * This is the record for the group leader. It shows the |
1350 | * group-wide total, not its individual thread total. | |
6d8c4e3b | 1351 | */ |
cd19c364 FW |
1352 | thread_group_cputime(p, &cputime); |
1353 | prstatus->pr_utime = ns_to_timeval(cputime.utime); | |
1354 | prstatus->pr_stime = ns_to_timeval(cputime.stime); | |
6d8c4e3b | 1355 | } else { |
cd19c364 | 1356 | u64 utime, stime; |
6fac4829 | 1357 | |
cd19c364 FW |
1358 | task_cputime(p, &utime, &stime); |
1359 | prstatus->pr_utime = ns_to_timeval(utime); | |
1360 | prstatus->pr_stime = ns_to_timeval(stime); | |
6d8c4e3b | 1361 | } |
5613fda9 FW |
1362 | prstatus->pr_cutime = ns_to_timeval(p->signal->cutime); |
1363 | prstatus->pr_cstime = ns_to_timeval(p->signal->cstime); | |
6d8c4e3b DH |
1364 | |
1365 | prstatus->pr_exec_fdpic_loadmap = p->mm->context.exec_fdpic_loadmap; | |
1366 | prstatus->pr_interp_fdpic_loadmap = p->mm->context.interp_fdpic_loadmap; | |
1367 | } | |
1368 | ||
1369 | static int fill_psinfo(struct elf_prpsinfo *psinfo, struct task_struct *p, | |
1370 | struct mm_struct *mm) | |
1371 | { | |
c69e8d9c | 1372 | const struct cred *cred; |
6d8c4e3b DH |
1373 | unsigned int i, len; |
1374 | ||
1375 | /* first copy the parameters from user space */ | |
1376 | memset(psinfo, 0, sizeof(struct elf_prpsinfo)); | |
1377 | ||
1378 | len = mm->arg_end - mm->arg_start; | |
1379 | if (len >= ELF_PRARGSZ) | |
1380 | len = ELF_PRARGSZ - 1; | |
1381 | if (copy_from_user(&psinfo->pr_psargs, | |
1382 | (const char __user *) mm->arg_start, len)) | |
1383 | return -EFAULT; | |
1384 | for (i = 0; i < len; i++) | |
1385 | if (psinfo->pr_psargs[i] == 0) | |
1386 | psinfo->pr_psargs[i] = ' '; | |
1387 | psinfo->pr_psargs[len] = 0; | |
1388 | ||
3b34fc58 ON |
1389 | rcu_read_lock(); |
1390 | psinfo->pr_ppid = task_pid_vnr(rcu_dereference(p->real_parent)); | |
1391 | rcu_read_unlock(); | |
b488893a | 1392 | psinfo->pr_pid = task_pid_vnr(p); |
b488893a PE |
1393 | psinfo->pr_pgrp = task_pgrp_vnr(p); |
1394 | psinfo->pr_sid = task_session_vnr(p); | |
6d8c4e3b DH |
1395 | |
1396 | i = p->state ? ffz(~p->state) + 1 : 0; | |
1397 | psinfo->pr_state = i; | |
1398 | psinfo->pr_sname = (i > 5) ? '.' : "RSDTZW"[i]; | |
1399 | psinfo->pr_zomb = psinfo->pr_sname == 'Z'; | |
1400 | psinfo->pr_nice = task_nice(p); | |
1401 | psinfo->pr_flag = p->flags; | |
c69e8d9c DH |
1402 | rcu_read_lock(); |
1403 | cred = __task_cred(p); | |
ebc887b2 EB |
1404 | SET_UID(psinfo->pr_uid, from_kuid_munged(cred->user_ns, cred->uid)); |
1405 | SET_GID(psinfo->pr_gid, from_kgid_munged(cred->user_ns, cred->gid)); | |
c69e8d9c | 1406 | rcu_read_unlock(); |
6d8c4e3b DH |
1407 | strncpy(psinfo->pr_fname, p->comm, sizeof(psinfo->pr_fname)); |
1408 | ||
1409 | return 0; | |
1410 | } | |
1411 | ||
1412 | /* Here is the structure in which status of each thread is captured. */ | |
1413 | struct elf_thread_status | |
1414 | { | |
1415 | struct list_head list; | |
1416 | struct elf_prstatus prstatus; /* NT_PRSTATUS */ | |
1417 | elf_fpregset_t fpu; /* NT_PRFPREG */ | |
1418 | struct task_struct *thread; | |
1419 | #ifdef ELF_CORE_COPY_XFPREGS | |
5b20cd80 | 1420 | elf_fpxregset_t xfpu; /* ELF_CORE_XFPREG_TYPE */ |
6d8c4e3b DH |
1421 | #endif |
1422 | struct memelfnote notes[3]; | |
1423 | int num_notes; | |
1424 | }; | |
1425 | ||
1426 | /* | |
1427 | * In order to add the specific thread information for the elf file format, | |
1428 | * we need to keep a linked list of every thread's pr_status and then create | |
1429 | * a single section for them in the final core file. | |
1430 | */ | |
1431 | static int elf_dump_thread_status(long signr, struct elf_thread_status *t) | |
1432 | { | |
1433 | struct task_struct *p = t->thread; | |
1434 | int sz = 0; | |
1435 | ||
1436 | t->num_notes = 0; | |
1437 | ||
1438 | fill_prstatus(&t->prstatus, p, signr); | |
1439 | elf_core_copy_task_regs(p, &t->prstatus.pr_reg); | |
1440 | ||
1441 | fill_note(&t->notes[0], "CORE", NT_PRSTATUS, sizeof(t->prstatus), | |
1442 | &t->prstatus); | |
1443 | t->num_notes++; | |
1444 | sz += notesize(&t->notes[0]); | |
1445 | ||
1446 | t->prstatus.pr_fpvalid = elf_core_copy_task_fpregs(p, NULL, &t->fpu); | |
1447 | if (t->prstatus.pr_fpvalid) { | |
1448 | fill_note(&t->notes[1], "CORE", NT_PRFPREG, sizeof(t->fpu), | |
1449 | &t->fpu); | |
1450 | t->num_notes++; | |
1451 | sz += notesize(&t->notes[1]); | |
1452 | } | |
1453 | ||
1454 | #ifdef ELF_CORE_COPY_XFPREGS | |
1455 | if (elf_core_copy_task_xfpregs(p, &t->xfpu)) { | |
5b20cd80 MN |
1456 | fill_note(&t->notes[2], "LINUX", ELF_CORE_XFPREG_TYPE, |
1457 | sizeof(t->xfpu), &t->xfpu); | |
6d8c4e3b DH |
1458 | t->num_notes++; |
1459 | sz += notesize(&t->notes[2]); | |
1460 | } | |
1461 | #endif | |
1462 | return sz; | |
1463 | } | |
1464 | ||
8d9032bb DH |
1465 | static void fill_extnum_info(struct elfhdr *elf, struct elf_shdr *shdr4extnum, |
1466 | elf_addr_t e_shoff, int segs) | |
1467 | { | |
1468 | elf->e_shoff = e_shoff; | |
1469 | elf->e_shentsize = sizeof(*shdr4extnum); | |
1470 | elf->e_shnum = 1; | |
1471 | elf->e_shstrndx = SHN_UNDEF; | |
1472 | ||
1473 | memset(shdr4extnum, 0, sizeof(*shdr4extnum)); | |
1474 | ||
1475 | shdr4extnum->sh_type = SHT_NULL; | |
1476 | shdr4extnum->sh_size = elf->e_shnum; | |
1477 | shdr4extnum->sh_link = elf->e_shstrndx; | |
1478 | shdr4extnum->sh_info = segs; | |
1479 | } | |
1480 | ||
6d8c4e3b DH |
1481 | /* |
1482 | * dump the segments for an MMU process | |
1483 | */ | |
e6c1baa9 | 1484 | static bool elf_fdpic_dump_segments(struct coredump_params *cprm) |
6d8c4e3b DH |
1485 | { |
1486 | struct vm_area_struct *vma; | |
1487 | ||
1488 | for (vma = current->mm->mmap; vma; vma = vma->vm_next) { | |
1489 | unsigned long addr; | |
1490 | ||
e6c1baa9 | 1491 | if (!maydump(vma, cprm->mm_flags)) |
6d8c4e3b DH |
1492 | continue; |
1493 | ||
e6c1baa9 | 1494 | #ifdef CONFIG_MMU |
f3e8fccd HD |
1495 | for (addr = vma->vm_start; addr < vma->vm_end; |
1496 | addr += PAGE_SIZE) { | |
e6c1baa9 | 1497 | bool res; |
f3e8fccd HD |
1498 | struct page *page = get_dump_page(addr); |
1499 | if (page) { | |
1500 | void *kaddr = kmap(page); | |
e6c1baa9 | 1501 | res = dump_emit(cprm, kaddr, PAGE_SIZE); |
6d8c4e3b | 1502 | kunmap(page); |
09cbfeaf | 1503 | put_page(page); |
e6c1baa9 | 1504 | } else { |
9b56d543 | 1505 | res = dump_skip(cprm, PAGE_SIZE); |
e6c1baa9 AV |
1506 | } |
1507 | if (!res) | |
1508 | return false; | |
6d8c4e3b | 1509 | } |
e6c1baa9 AV |
1510 | #else |
1511 | if (!dump_emit(cprm, (void *) vma->vm_start, | |
6d8c4e3b | 1512 | vma->vm_end - vma->vm_start)) |
e6c1baa9 AV |
1513 | return false; |
1514 | #endif | |
6d8c4e3b | 1515 | } |
e6c1baa9 | 1516 | return true; |
6d8c4e3b | 1517 | } |
6d8c4e3b | 1518 | |
8d9032bb DH |
1519 | static size_t elf_core_vma_data_size(unsigned long mm_flags) |
1520 | { | |
1521 | struct vm_area_struct *vma; | |
1522 | size_t size = 0; | |
1523 | ||
47568d4c | 1524 | for (vma = current->mm->mmap; vma; vma = vma->vm_next) |
8d9032bb DH |
1525 | if (maydump(vma, mm_flags)) |
1526 | size += vma->vm_end - vma->vm_start; | |
1527 | return size; | |
1528 | } | |
1529 | ||
6d8c4e3b DH |
1530 | /* |
1531 | * Actual dumper | |
1532 | * | |
1533 | * This is a two-pass process; first we find the offsets of the bits, | |
1534 | * and then they are actually written out. If we run out of core limit | |
1535 | * we just truncate. | |
1536 | */ | |
f6151dfe | 1537 | static int elf_fdpic_core_dump(struct coredump_params *cprm) |
6d8c4e3b DH |
1538 | { |
1539 | #define NUM_NOTES 6 | |
1540 | int has_dumped = 0; | |
1541 | mm_segment_t fs; | |
1542 | int segs; | |
6d8c4e3b DH |
1543 | int i; |
1544 | struct vm_area_struct *vma; | |
1545 | struct elfhdr *elf = NULL; | |
9b56d543 | 1546 | loff_t offset = 0, dataoff; |
6d8c4e3b DH |
1547 | int numnote; |
1548 | struct memelfnote *notes = NULL; | |
1549 | struct elf_prstatus *prstatus = NULL; /* NT_PRSTATUS */ | |
1550 | struct elf_prpsinfo *psinfo = NULL; /* NT_PRPSINFO */ | |
6d8c4e3b DH |
1551 | LIST_HEAD(thread_list); |
1552 | struct list_head *t; | |
1553 | elf_fpregset_t *fpu = NULL; | |
1554 | #ifdef ELF_CORE_COPY_XFPREGS | |
1555 | elf_fpxregset_t *xfpu = NULL; | |
1556 | #endif | |
1557 | int thread_status_size = 0; | |
6d8c4e3b | 1558 | elf_addr_t *auxv; |
93eb211e | 1559 | struct elf_phdr *phdr4note = NULL; |
8d9032bb DH |
1560 | struct elf_shdr *shdr4extnum = NULL; |
1561 | Elf_Half e_phnum; | |
1562 | elf_addr_t e_shoff; | |
afabada9 AV |
1563 | struct core_thread *ct; |
1564 | struct elf_thread_status *tmp; | |
6d8c4e3b DH |
1565 | |
1566 | /* | |
1567 | * We no longer stop all VM operations. | |
1568 | * | |
1569 | * This is because those proceses that could possibly change map_count | |
1570 | * or the mmap / vma pages are now blocked in do_exit on current | |
1571 | * finishing this core dump. | |
1572 | * | |
1573 | * Only ptrace can touch these memory addresses, but it doesn't change | |
1574 | * the map_count or the pages allocated. So no possibility of crashing | |
1575 | * exists while dumping the mm->vm_next areas to the core file. | |
1576 | */ | |
1577 | ||
1578 | /* alloc memory for large data structures: too large to be on stack */ | |
1579 | elf = kmalloc(sizeof(*elf), GFP_KERNEL); | |
1580 | if (!elf) | |
1581 | goto cleanup; | |
1582 | prstatus = kzalloc(sizeof(*prstatus), GFP_KERNEL); | |
1583 | if (!prstatus) | |
1584 | goto cleanup; | |
1585 | psinfo = kmalloc(sizeof(*psinfo), GFP_KERNEL); | |
1586 | if (!psinfo) | |
1587 | goto cleanup; | |
1588 | notes = kmalloc(NUM_NOTES * sizeof(struct memelfnote), GFP_KERNEL); | |
1589 | if (!notes) | |
1590 | goto cleanup; | |
1591 | fpu = kmalloc(sizeof(*fpu), GFP_KERNEL); | |
1592 | if (!fpu) | |
1593 | goto cleanup; | |
1594 | #ifdef ELF_CORE_COPY_XFPREGS | |
1595 | xfpu = kmalloc(sizeof(*xfpu), GFP_KERNEL); | |
1596 | if (!xfpu) | |
1597 | goto cleanup; | |
1598 | #endif | |
1599 | ||
afabada9 AV |
1600 | for (ct = current->mm->core_state->dumper.next; |
1601 | ct; ct = ct->next) { | |
1602 | tmp = kzalloc(sizeof(*tmp), GFP_KERNEL); | |
1603 | if (!tmp) | |
1604 | goto cleanup; | |
182c515f | 1605 | |
afabada9 AV |
1606 | tmp->thread = ct->task; |
1607 | list_add(&tmp->list, &thread_list); | |
1608 | } | |
182c515f | 1609 | |
afabada9 AV |
1610 | list_for_each(t, &thread_list) { |
1611 | struct elf_thread_status *tmp; | |
1612 | int sz; | |
6d8c4e3b | 1613 | |
afabada9 AV |
1614 | tmp = list_entry(t, struct elf_thread_status, list); |
1615 | sz = elf_dump_thread_status(cprm->siginfo->si_signo, tmp); | |
1616 | thread_status_size += sz; | |
6d8c4e3b DH |
1617 | } |
1618 | ||
1619 | /* now collect the dump for the current */ | |
5ab1c309 | 1620 | fill_prstatus(prstatus, current, cprm->siginfo->si_signo); |
f6151dfe | 1621 | elf_core_copy_regs(&prstatus->pr_reg, cprm->regs); |
6d8c4e3b | 1622 | |
6d8c4e3b | 1623 | segs = current->mm->map_count; |
1fcccbac | 1624 | segs += elf_core_extra_phdrs(); |
6d8c4e3b | 1625 | |
8d9032bb DH |
1626 | /* for notes section */ |
1627 | segs++; | |
1628 | ||
1629 | /* If segs > PN_XNUM(0xffff), then e_phnum overflows. To avoid | |
1630 | * this, kernel supports extended numbering. Have a look at | |
1631 | * include/linux/elf.h for further information. */ | |
1632 | e_phnum = segs > PN_XNUM ? PN_XNUM : segs; | |
1633 | ||
6d8c4e3b | 1634 | /* Set up header */ |
8d9032bb | 1635 | fill_elf_fdpic_header(elf, e_phnum); |
6d8c4e3b DH |
1636 | |
1637 | has_dumped = 1; | |
6d8c4e3b DH |
1638 | /* |
1639 | * Set up the notes in similar form to SVR4 core dumps made | |
1640 | * with info from their /proc. | |
1641 | */ | |
1642 | ||
1643 | fill_note(notes + 0, "CORE", NT_PRSTATUS, sizeof(*prstatus), prstatus); | |
1644 | fill_psinfo(psinfo, current->group_leader, current->mm); | |
1645 | fill_note(notes + 1, "CORE", NT_PRPSINFO, sizeof(*psinfo), psinfo); | |
1646 | ||
1647 | numnote = 2; | |
1648 | ||
1649 | auxv = (elf_addr_t *) current->mm->saved_auxv; | |
1650 | ||
1651 | i = 0; | |
1652 | do | |
1653 | i += 2; | |
1654 | while (auxv[i - 2] != AT_NULL); | |
1655 | fill_note(¬es[numnote++], "CORE", NT_AUXV, | |
1656 | i * sizeof(elf_addr_t), auxv); | |
1657 | ||
1658 | /* Try to dump the FPU. */ | |
1659 | if ((prstatus->pr_fpvalid = | |
f6151dfe | 1660 | elf_core_copy_task_fpregs(current, cprm->regs, fpu))) |
6d8c4e3b DH |
1661 | fill_note(notes + numnote++, |
1662 | "CORE", NT_PRFPREG, sizeof(*fpu), fpu); | |
1663 | #ifdef ELF_CORE_COPY_XFPREGS | |
1664 | if (elf_core_copy_task_xfpregs(current, xfpu)) | |
1665 | fill_note(notes + numnote++, | |
5b20cd80 | 1666 | "LINUX", ELF_CORE_XFPREG_TYPE, sizeof(*xfpu), xfpu); |
6d8c4e3b DH |
1667 | #endif |
1668 | ||
1669 | fs = get_fs(); | |
1670 | set_fs(KERNEL_DS); | |
1671 | ||
6d8c4e3b | 1672 | offset += sizeof(*elf); /* Elf header */ |
8d9032bb | 1673 | offset += segs * sizeof(struct elf_phdr); /* Program headers */ |
6d8c4e3b DH |
1674 | |
1675 | /* Write notes phdr entry */ | |
1676 | { | |
6d8c4e3b DH |
1677 | int sz = 0; |
1678 | ||
1679 | for (i = 0; i < numnote; i++) | |
1680 | sz += notesize(notes + i); | |
1681 | ||
1682 | sz += thread_status_size; | |
1683 | ||
93eb211e DH |
1684 | phdr4note = kmalloc(sizeof(*phdr4note), GFP_KERNEL); |
1685 | if (!phdr4note) | |
088e7af7 | 1686 | goto end_coredump; |
93eb211e DH |
1687 | |
1688 | fill_elf_note_phdr(phdr4note, sz, offset); | |
1689 | offset += sz; | |
6d8c4e3b DH |
1690 | } |
1691 | ||
1692 | /* Page-align dumped data */ | |
1693 | dataoff = offset = roundup(offset, ELF_EXEC_PAGESIZE); | |
1694 | ||
30736a4d | 1695 | offset += elf_core_vma_data_size(cprm->mm_flags); |
8d9032bb DH |
1696 | offset += elf_core_extra_data_size(); |
1697 | e_shoff = offset; | |
1698 | ||
1699 | if (e_phnum == PN_XNUM) { | |
1700 | shdr4extnum = kmalloc(sizeof(*shdr4extnum), GFP_KERNEL); | |
1701 | if (!shdr4extnum) | |
1702 | goto end_coredump; | |
1703 | fill_extnum_info(elf, shdr4extnum, e_shoff, segs); | |
1704 | } | |
1705 | ||
1706 | offset = dataoff; | |
1707 | ||
e6c1baa9 | 1708 | if (!dump_emit(cprm, elf, sizeof(*elf))) |
93eb211e DH |
1709 | goto end_coredump; |
1710 | ||
e6c1baa9 | 1711 | if (!dump_emit(cprm, phdr4note, sizeof(*phdr4note))) |
93eb211e DH |
1712 | goto end_coredump; |
1713 | ||
6d8c4e3b | 1714 | /* write program headers for segments dump */ |
8feae131 | 1715 | for (vma = current->mm->mmap; vma; vma = vma->vm_next) { |
6d8c4e3b DH |
1716 | struct elf_phdr phdr; |
1717 | size_t sz; | |
1718 | ||
6d8c4e3b DH |
1719 | sz = vma->vm_end - vma->vm_start; |
1720 | ||
1721 | phdr.p_type = PT_LOAD; | |
1722 | phdr.p_offset = offset; | |
1723 | phdr.p_vaddr = vma->vm_start; | |
1724 | phdr.p_paddr = 0; | |
30736a4d | 1725 | phdr.p_filesz = maydump(vma, cprm->mm_flags) ? sz : 0; |
6d8c4e3b DH |
1726 | phdr.p_memsz = sz; |
1727 | offset += phdr.p_filesz; | |
1728 | phdr.p_flags = vma->vm_flags & VM_READ ? PF_R : 0; | |
1729 | if (vma->vm_flags & VM_WRITE) | |
1730 | phdr.p_flags |= PF_W; | |
1731 | if (vma->vm_flags & VM_EXEC) | |
1732 | phdr.p_flags |= PF_X; | |
1733 | phdr.p_align = ELF_EXEC_PAGESIZE; | |
1734 | ||
e6c1baa9 | 1735 | if (!dump_emit(cprm, &phdr, sizeof(phdr))) |
088e7af7 | 1736 | goto end_coredump; |
6d8c4e3b DH |
1737 | } |
1738 | ||
506f21c5 | 1739 | if (!elf_core_write_extra_phdrs(cprm, offset)) |
1fcccbac | 1740 | goto end_coredump; |
6d8c4e3b DH |
1741 | |
1742 | /* write out the notes section */ | |
1743 | for (i = 0; i < numnote; i++) | |
e6c1baa9 | 1744 | if (!writenote(notes + i, cprm)) |
6d8c4e3b DH |
1745 | goto end_coredump; |
1746 | ||
1747 | /* write out the thread status notes section */ | |
1748 | list_for_each(t, &thread_list) { | |
1749 | struct elf_thread_status *tmp = | |
1750 | list_entry(t, struct elf_thread_status, list); | |
1751 | ||
1752 | for (i = 0; i < tmp->num_notes; i++) | |
e6c1baa9 | 1753 | if (!writenote(&tmp->notes[i], cprm)) |
6d8c4e3b DH |
1754 | goto end_coredump; |
1755 | } | |
1756 | ||
1607f09c | 1757 | if (!dump_skip(cprm, dataoff - cprm->pos)) |
f3e8fccd | 1758 | goto end_coredump; |
6d8c4e3b | 1759 | |
e6c1baa9 | 1760 | if (!elf_fdpic_dump_segments(cprm)) |
6d8c4e3b DH |
1761 | goto end_coredump; |
1762 | ||
aa3e7eaf | 1763 | if (!elf_core_write_extra_data(cprm)) |
1fcccbac | 1764 | goto end_coredump; |
6d8c4e3b | 1765 | |
8d9032bb | 1766 | if (e_phnum == PN_XNUM) { |
e6c1baa9 | 1767 | if (!dump_emit(cprm, shdr4extnum, sizeof(*shdr4extnum))) |
8d9032bb DH |
1768 | goto end_coredump; |
1769 | } | |
1770 | ||
2f48912d | 1771 | if (cprm->file->f_pos != offset) { |
6d8c4e3b DH |
1772 | /* Sanity check */ |
1773 | printk(KERN_WARNING | |
1774 | "elf_core_dump: file->f_pos (%lld) != offset (%lld)\n", | |
2f48912d | 1775 | cprm->file->f_pos, offset); |
6d8c4e3b DH |
1776 | } |
1777 | ||
1778 | end_coredump: | |
1779 | set_fs(fs); | |
1780 | ||
1781 | cleanup: | |
1782 | while (!list_empty(&thread_list)) { | |
1783 | struct list_head *tmp = thread_list.next; | |
1784 | list_del(tmp); | |
1785 | kfree(list_entry(tmp, struct elf_thread_status, list)); | |
1786 | } | |
93eb211e | 1787 | kfree(phdr4note); |
6d8c4e3b DH |
1788 | kfree(elf); |
1789 | kfree(prstatus); | |
1790 | kfree(psinfo); | |
1791 | kfree(notes); | |
1792 | kfree(fpu); | |
bcb65a79 | 1793 | kfree(shdr4extnum); |
6d8c4e3b DH |
1794 | #ifdef ELF_CORE_COPY_XFPREGS |
1795 | kfree(xfpu); | |
1796 | #endif | |
1797 | return has_dumped; | |
1798 | #undef NUM_NOTES | |
1799 | } | |
1800 | ||
698ba7b5 | 1801 | #endif /* CONFIG_ELF_CORE */ |