Commit | Line | Data |
---|---|---|
2874c5fd | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
1da177e4 LT |
2 | /* binfmt_elf_fdpic.c: FDPIC ELF binary format |
3 | * | |
8a2ab7f5 | 4 | * Copyright (C) 2003, 2004, 2006 Red Hat, Inc. All Rights Reserved. |
1da177e4 LT |
5 | * Written by David Howells (dhowells@redhat.com) |
6 | * Derived from binfmt_elf.c | |
1da177e4 LT |
7 | */ |
8 | ||
9 | #include <linux/module.h> | |
10 | ||
11 | #include <linux/fs.h> | |
12 | #include <linux/stat.h> | |
13 | #include <linux/sched.h> | |
68db0cf1 IM |
14 | #include <linux/sched/coredump.h> |
15 | #include <linux/sched/task_stack.h> | |
32ef5517 | 16 | #include <linux/sched/cputime.h> |
1da177e4 LT |
17 | #include <linux/mm.h> |
18 | #include <linux/mman.h> | |
19 | #include <linux/errno.h> | |
20 | #include <linux/signal.h> | |
21 | #include <linux/binfmts.h> | |
22 | #include <linux/string.h> | |
23 | #include <linux/file.h> | |
24 | #include <linux/fcntl.h> | |
25 | #include <linux/slab.h> | |
6d8c4e3b | 26 | #include <linux/pagemap.h> |
5edc2a51 | 27 | #include <linux/security.h> |
1da177e4 | 28 | #include <linux/highmem.h> |
6d8c4e3b | 29 | #include <linux/highuid.h> |
1da177e4 LT |
30 | #include <linux/personality.h> |
31 | #include <linux/ptrace.h> | |
32 | #include <linux/init.h> | |
1da177e4 LT |
33 | #include <linux/elf.h> |
34 | #include <linux/elf-fdpic.h> | |
35 | #include <linux/elfcore.h> | |
088e7af7 | 36 | #include <linux/coredump.h> |
ab27a8d0 | 37 | #include <linux/dax.h> |
1da177e4 | 38 | |
7c0f6ba6 | 39 | #include <linux/uaccess.h> |
1da177e4 LT |
40 | #include <asm/param.h> |
41 | #include <asm/pgalloc.h> | |
42 | ||
43 | typedef char *elf_caddr_t; | |
1da177e4 LT |
44 | |
45 | #if 0 | |
46 | #define kdebug(fmt, ...) printk("FDPIC "fmt"\n" ,##__VA_ARGS__ ) | |
47 | #else | |
48 | #define kdebug(fmt, ...) do {} while(0) | |
49 | #endif | |
50 | ||
6d8c4e3b DH |
51 | #if 0 |
52 | #define kdcore(fmt, ...) printk("FDPIC "fmt"\n" ,##__VA_ARGS__ ) | |
53 | #else | |
54 | #define kdcore(fmt, ...) do {} while(0) | |
55 | #endif | |
56 | ||
1da177e4 LT |
57 | MODULE_LICENSE("GPL"); |
58 | ||
71613c3b | 59 | static int load_elf_fdpic_binary(struct linux_binprm *); |
8a2ab7f5 DH |
60 | static int elf_fdpic_fetch_phdrs(struct elf_fdpic_params *, struct file *); |
61 | static int elf_fdpic_map_file(struct elf_fdpic_params *, struct file *, | |
62 | struct mm_struct *, const char *); | |
1da177e4 | 63 | |
8a2ab7f5 DH |
64 | static int create_elf_fdpic_tables(struct linux_binprm *, struct mm_struct *, |
65 | struct elf_fdpic_params *, | |
66 | struct elf_fdpic_params *); | |
1da177e4 LT |
67 | |
68 | #ifndef CONFIG_MMU | |
8a2ab7f5 DH |
69 | static int elf_fdpic_map_file_constdisp_on_uclinux(struct elf_fdpic_params *, |
70 | struct file *, | |
71 | struct mm_struct *); | |
1da177e4 LT |
72 | #endif |
73 | ||
8a2ab7f5 DH |
74 | static int elf_fdpic_map_file_by_direct_mmap(struct elf_fdpic_params *, |
75 | struct file *, struct mm_struct *); | |
1da177e4 | 76 | |
698ba7b5 | 77 | #ifdef CONFIG_ELF_CORE |
f6151dfe | 78 | static int elf_fdpic_core_dump(struct coredump_params *cprm); |
6d8c4e3b DH |
79 | #endif |
80 | ||
1da177e4 LT |
81 | static struct linux_binfmt elf_fdpic_format = { |
82 | .module = THIS_MODULE, | |
83 | .load_binary = load_elf_fdpic_binary, | |
698ba7b5 | 84 | #ifdef CONFIG_ELF_CORE |
6d8c4e3b DH |
85 | .core_dump = elf_fdpic_core_dump, |
86 | #endif | |
1da177e4 LT |
87 | .min_coredump = ELF_EXEC_PAGESIZE, |
88 | }; | |
89 | ||
8a2ab7f5 DH |
90 | static int __init init_elf_fdpic_binfmt(void) |
91 | { | |
8fc3dc5a AV |
92 | register_binfmt(&elf_fdpic_format); |
93 | return 0; | |
8a2ab7f5 | 94 | } |
1da177e4 | 95 | |
8a2ab7f5 DH |
96 | static void __exit exit_elf_fdpic_binfmt(void) |
97 | { | |
98 | unregister_binfmt(&elf_fdpic_format); | |
99 | } | |
100 | ||
6d8c4e3b | 101 | core_initcall(init_elf_fdpic_binfmt); |
8a2ab7f5 | 102 | module_exit(exit_elf_fdpic_binfmt); |
1da177e4 | 103 | |
1bde925d | 104 | static int is_elf(struct elfhdr *hdr, struct file *file) |
1da177e4 LT |
105 | { |
106 | if (memcmp(hdr->e_ident, ELFMAG, SELFMAG) != 0) | |
107 | return 0; | |
108 | if (hdr->e_type != ET_EXEC && hdr->e_type != ET_DYN) | |
109 | return 0; | |
1bde925d | 110 | if (!elf_check_arch(hdr)) |
1da177e4 | 111 | return 0; |
72c2d531 | 112 | if (!file->f_op->mmap) |
1da177e4 LT |
113 | return 0; |
114 | return 1; | |
115 | } | |
116 | ||
1bde925d RF |
117 | #ifndef elf_check_fdpic |
118 | #define elf_check_fdpic(x) 0 | |
119 | #endif | |
120 | ||
121 | #ifndef elf_check_const_displacement | |
122 | #define elf_check_const_displacement(x) 0 | |
123 | #endif | |
124 | ||
125 | static int is_constdisp(struct elfhdr *hdr) | |
126 | { | |
127 | if (!elf_check_fdpic(hdr)) | |
128 | return 1; | |
129 | if (elf_check_const_displacement(hdr)) | |
130 | return 1; | |
131 | return 0; | |
132 | } | |
133 | ||
1da177e4 LT |
134 | /*****************************************************************************/ |
135 | /* | |
136 | * read the program headers table into memory | |
137 | */ | |
8a2ab7f5 DH |
138 | static int elf_fdpic_fetch_phdrs(struct elf_fdpic_params *params, |
139 | struct file *file) | |
1da177e4 LT |
140 | { |
141 | struct elf32_phdr *phdr; | |
142 | unsigned long size; | |
143 | int retval, loop; | |
bdd1d2d3 | 144 | loff_t pos = params->hdr.e_phoff; |
1da177e4 LT |
145 | |
146 | if (params->hdr.e_phentsize != sizeof(struct elf_phdr)) | |
147 | return -ENOMEM; | |
148 | if (params->hdr.e_phnum > 65536U / sizeof(struct elf_phdr)) | |
149 | return -ENOMEM; | |
150 | ||
151 | size = params->hdr.e_phnum * sizeof(struct elf_phdr); | |
152 | params->phdrs = kmalloc(size, GFP_KERNEL); | |
153 | if (!params->phdrs) | |
154 | return -ENOMEM; | |
155 | ||
bdd1d2d3 | 156 | retval = kernel_read(file, params->phdrs, size, &pos); |
e1d2c8b6 DH |
157 | if (unlikely(retval != size)) |
158 | return retval < 0 ? retval : -ENOEXEC; | |
1da177e4 LT |
159 | |
160 | /* determine stack size for this binary */ | |
161 | phdr = params->phdrs; | |
162 | for (loop = 0; loop < params->hdr.e_phnum; loop++, phdr++) { | |
163 | if (phdr->p_type != PT_GNU_STACK) | |
164 | continue; | |
165 | ||
166 | if (phdr->p_flags & PF_X) | |
167 | params->flags |= ELF_FDPIC_FLAG_EXEC_STACK; | |
168 | else | |
169 | params->flags |= ELF_FDPIC_FLAG_NOEXEC_STACK; | |
170 | ||
171 | params->stack_size = phdr->p_memsz; | |
172 | break; | |
173 | } | |
174 | ||
175 | return 0; | |
8a2ab7f5 | 176 | } |
1da177e4 LT |
177 | |
178 | /*****************************************************************************/ | |
179 | /* | |
180 | * load an fdpic binary into various bits of memory | |
181 | */ | |
71613c3b | 182 | static int load_elf_fdpic_binary(struct linux_binprm *bprm) |
1da177e4 LT |
183 | { |
184 | struct elf_fdpic_params exec_params, interp_params; | |
71613c3b | 185 | struct pt_regs *regs = current_pt_regs(); |
1da177e4 | 186 | struct elf_phdr *phdr; |
8a2ab7f5 | 187 | unsigned long stack_size, entryaddr; |
8a2ab7f5 DH |
188 | #ifdef ELF_FDPIC_PLAT_INIT |
189 | unsigned long dynaddr; | |
04e4f2b1 MF |
190 | #endif |
191 | #ifndef CONFIG_MMU | |
192 | unsigned long stack_prot; | |
8a2ab7f5 | 193 | #endif |
1da177e4 LT |
194 | struct file *interpreter = NULL; /* to shut gcc up */ |
195 | char *interpreter_name = NULL; | |
196 | int executable_stack; | |
197 | int retval, i; | |
bdd1d2d3 | 198 | loff_t pos; |
1da177e4 | 199 | |
aa289b47 DH |
200 | kdebug("____ LOAD %d ____", current->pid); |
201 | ||
1da177e4 LT |
202 | memset(&exec_params, 0, sizeof(exec_params)); |
203 | memset(&interp_params, 0, sizeof(interp_params)); | |
204 | ||
205 | exec_params.hdr = *(struct elfhdr *) bprm->buf; | |
206 | exec_params.flags = ELF_FDPIC_FLAG_PRESENT | ELF_FDPIC_FLAG_EXECUTABLE; | |
207 | ||
208 | /* check that this is a binary we know how to deal with */ | |
209 | retval = -ENOEXEC; | |
1bde925d | 210 | if (!is_elf(&exec_params.hdr, bprm->file)) |
1da177e4 | 211 | goto error; |
1bde925d RF |
212 | if (!elf_check_fdpic(&exec_params.hdr)) { |
213 | #ifdef CONFIG_MMU | |
214 | /* binfmt_elf handles non-fdpic elf except on nommu */ | |
215 | goto error; | |
216 | #else | |
217 | /* nommu can only load ET_DYN (PIE) ELF */ | |
218 | if (exec_params.hdr.e_type != ET_DYN) | |
219 | goto error; | |
220 | #endif | |
221 | } | |
1da177e4 LT |
222 | |
223 | /* read the program header table */ | |
224 | retval = elf_fdpic_fetch_phdrs(&exec_params, bprm->file); | |
225 | if (retval < 0) | |
226 | goto error; | |
227 | ||
228 | /* scan for a program header that specifies an interpreter */ | |
229 | phdr = exec_params.phdrs; | |
230 | ||
231 | for (i = 0; i < exec_params.hdr.e_phnum; i++, phdr++) { | |
232 | switch (phdr->p_type) { | |
233 | case PT_INTERP: | |
234 | retval = -ENOMEM; | |
235 | if (phdr->p_filesz > PATH_MAX) | |
236 | goto error; | |
237 | retval = -ENOENT; | |
238 | if (phdr->p_filesz < 2) | |
239 | goto error; | |
240 | ||
241 | /* read the name of the interpreter into memory */ | |
792db3af | 242 | interpreter_name = kmalloc(phdr->p_filesz, GFP_KERNEL); |
1da177e4 LT |
243 | if (!interpreter_name) |
244 | goto error; | |
245 | ||
bdd1d2d3 CH |
246 | pos = phdr->p_offset; |
247 | retval = kernel_read(bprm->file, interpreter_name, | |
248 | phdr->p_filesz, &pos); | |
e1d2c8b6 DH |
249 | if (unlikely(retval != phdr->p_filesz)) { |
250 | if (retval >= 0) | |
251 | retval = -ENOEXEC; | |
1da177e4 | 252 | goto error; |
e1d2c8b6 | 253 | } |
1da177e4 LT |
254 | |
255 | retval = -ENOENT; | |
256 | if (interpreter_name[phdr->p_filesz - 1] != '\0') | |
257 | goto error; | |
258 | ||
259 | kdebug("Using ELF interpreter %s", interpreter_name); | |
260 | ||
261 | /* replace the program with the interpreter */ | |
262 | interpreter = open_exec(interpreter_name); | |
263 | retval = PTR_ERR(interpreter); | |
264 | if (IS_ERR(interpreter)) { | |
265 | interpreter = NULL; | |
266 | goto error; | |
267 | } | |
268 | ||
1fb84496 AD |
269 | /* |
270 | * If the binary is not readable then enforce | |
271 | * mm->dumpable = 0 regardless of the interpreter's | |
272 | * permissions. | |
273 | */ | |
1b5d783c | 274 | would_dump(bprm, interpreter); |
1fb84496 | 275 | |
bdd1d2d3 CH |
276 | pos = 0; |
277 | retval = kernel_read(interpreter, bprm->buf, | |
278 | BINPRM_BUF_SIZE, &pos); | |
e1d2c8b6 DH |
279 | if (unlikely(retval != BINPRM_BUF_SIZE)) { |
280 | if (retval >= 0) | |
281 | retval = -ENOEXEC; | |
1da177e4 | 282 | goto error; |
e1d2c8b6 | 283 | } |
1da177e4 LT |
284 | |
285 | interp_params.hdr = *((struct elfhdr *) bprm->buf); | |
286 | break; | |
287 | ||
288 | case PT_LOAD: | |
289 | #ifdef CONFIG_MMU | |
290 | if (exec_params.load_addr == 0) | |
291 | exec_params.load_addr = phdr->p_vaddr; | |
292 | #endif | |
293 | break; | |
294 | } | |
295 | ||
296 | } | |
297 | ||
1bde925d | 298 | if (is_constdisp(&exec_params.hdr)) |
1da177e4 LT |
299 | exec_params.flags |= ELF_FDPIC_FLAG_CONSTDISP; |
300 | ||
301 | /* perform insanity checks on the interpreter */ | |
302 | if (interpreter_name) { | |
303 | retval = -ELIBBAD; | |
1bde925d | 304 | if (!is_elf(&interp_params.hdr, interpreter)) |
1da177e4 LT |
305 | goto error; |
306 | ||
307 | interp_params.flags = ELF_FDPIC_FLAG_PRESENT; | |
308 | ||
309 | /* read the interpreter's program header table */ | |
310 | retval = elf_fdpic_fetch_phdrs(&interp_params, interpreter); | |
311 | if (retval < 0) | |
312 | goto error; | |
313 | } | |
314 | ||
315 | stack_size = exec_params.stack_size; | |
1da177e4 LT |
316 | if (exec_params.flags & ELF_FDPIC_FLAG_EXEC_STACK) |
317 | executable_stack = EXSTACK_ENABLE_X; | |
318 | else if (exec_params.flags & ELF_FDPIC_FLAG_NOEXEC_STACK) | |
319 | executable_stack = EXSTACK_DISABLE_X; | |
1da177e4 LT |
320 | else |
321 | executable_stack = EXSTACK_DEFAULT; | |
322 | ||
8e8b63a6 DH |
323 | if (stack_size == 0) { |
324 | stack_size = interp_params.stack_size; | |
325 | if (interp_params.flags & ELF_FDPIC_FLAG_EXEC_STACK) | |
326 | executable_stack = EXSTACK_ENABLE_X; | |
327 | else if (interp_params.flags & ELF_FDPIC_FLAG_NOEXEC_STACK) | |
328 | executable_stack = EXSTACK_DISABLE_X; | |
329 | else | |
330 | executable_stack = EXSTACK_DEFAULT; | |
331 | } | |
332 | ||
1da177e4 LT |
333 | retval = -ENOEXEC; |
334 | if (stack_size == 0) | |
1bde925d | 335 | stack_size = 131072UL; /* same as exec.c's default commit */ |
1da177e4 | 336 | |
1bde925d | 337 | if (is_constdisp(&interp_params.hdr)) |
1da177e4 LT |
338 | interp_params.flags |= ELF_FDPIC_FLAG_CONSTDISP; |
339 | ||
340 | /* flush all traces of the currently running executable */ | |
341 | retval = flush_old_exec(bprm); | |
342 | if (retval) | |
343 | goto error; | |
344 | ||
345 | /* there's now no turning back... the old userspace image is dead, | |
19d860a1 AV |
346 | * defunct, deceased, etc. |
347 | */ | |
1bde925d RF |
348 | if (elf_check_fdpic(&exec_params.hdr)) |
349 | set_personality(PER_LINUX_FDPIC); | |
350 | else | |
351 | set_personality(PER_LINUX); | |
04e4f2b1 MF |
352 | if (elf_read_implies_exec(&exec_params.hdr, executable_stack)) |
353 | current->personality |= READ_IMPLIES_EXEC; | |
221af7f8 LT |
354 | |
355 | setup_new_exec(bprm); | |
356 | ||
1da177e4 LT |
357 | set_binfmt(&elf_fdpic_format); |
358 | ||
359 | current->mm->start_code = 0; | |
360 | current->mm->end_code = 0; | |
361 | current->mm->start_stack = 0; | |
362 | current->mm->start_data = 0; | |
363 | current->mm->end_data = 0; | |
364 | current->mm->context.exec_fdpic_loadmap = 0; | |
365 | current->mm->context.interp_fdpic_loadmap = 0; | |
366 | ||
1da177e4 LT |
367 | #ifdef CONFIG_MMU |
368 | elf_fdpic_arch_lay_out_mm(&exec_params, | |
369 | &interp_params, | |
370 | ¤t->mm->start_stack, | |
371 | ¤t->mm->start_brk); | |
1da177e4 | 372 | |
8a2ab7f5 DH |
373 | retval = setup_arg_pages(bprm, current->mm->start_stack, |
374 | executable_stack); | |
19d860a1 AV |
375 | if (retval < 0) |
376 | goto error; | |
382e67ae NP |
377 | #ifdef ARCH_HAS_SETUP_ADDITIONAL_PAGES |
378 | retval = arch_setup_additional_pages(bprm, !!interpreter_name); | |
379 | if (retval < 0) | |
380 | goto error; | |
381 | #endif | |
1da177e4 LT |
382 | #endif |
383 | ||
384 | /* load the executable and interpreter into memory */ | |
8a2ab7f5 DH |
385 | retval = elf_fdpic_map_file(&exec_params, bprm->file, current->mm, |
386 | "executable"); | |
1da177e4 | 387 | if (retval < 0) |
19d860a1 | 388 | goto error; |
1da177e4 LT |
389 | |
390 | if (interpreter_name) { | |
391 | retval = elf_fdpic_map_file(&interp_params, interpreter, | |
392 | current->mm, "interpreter"); | |
393 | if (retval < 0) { | |
394 | printk(KERN_ERR "Unable to load interpreter\n"); | |
19d860a1 | 395 | goto error; |
1da177e4 LT |
396 | } |
397 | ||
398 | allow_write_access(interpreter); | |
399 | fput(interpreter); | |
400 | interpreter = NULL; | |
401 | } | |
402 | ||
403 | #ifdef CONFIG_MMU | |
404 | if (!current->mm->start_brk) | |
405 | current->mm->start_brk = current->mm->end_data; | |
406 | ||
8a2ab7f5 DH |
407 | current->mm->brk = current->mm->start_brk = |
408 | PAGE_ALIGN(current->mm->start_brk); | |
1da177e4 LT |
409 | |
410 | #else | |
4ac31311 | 411 | /* create a stack area and zero-size brk area */ |
1da177e4 LT |
412 | stack_size = (stack_size + PAGE_SIZE - 1) & PAGE_MASK; |
413 | if (stack_size < PAGE_SIZE * 2) | |
414 | stack_size = PAGE_SIZE * 2; | |
415 | ||
04e4f2b1 MF |
416 | stack_prot = PROT_READ | PROT_WRITE; |
417 | if (executable_stack == EXSTACK_ENABLE_X || | |
418 | (executable_stack == EXSTACK_DEFAULT && VM_STACK_FLAGS & VM_EXEC)) | |
419 | stack_prot |= PROT_EXEC; | |
420 | ||
6be5ceb0 | 421 | current->mm->start_brk = vm_mmap(NULL, 0, stack_size, stack_prot, |
ea637639 JZ |
422 | MAP_PRIVATE | MAP_ANONYMOUS | |
423 | MAP_UNINITIALIZED | MAP_GROWSDOWN, | |
1da177e4 LT |
424 | 0); |
425 | ||
8a2ab7f5 | 426 | if (IS_ERR_VALUE(current->mm->start_brk)) { |
1da177e4 LT |
427 | retval = current->mm->start_brk; |
428 | current->mm->start_brk = 0; | |
19d860a1 | 429 | goto error; |
1da177e4 LT |
430 | } |
431 | ||
1da177e4 LT |
432 | current->mm->brk = current->mm->start_brk; |
433 | current->mm->context.end_brk = current->mm->start_brk; | |
1da177e4 LT |
434 | current->mm->start_stack = current->mm->start_brk + stack_size; |
435 | #endif | |
436 | ||
a6f76f23 | 437 | install_exec_creds(bprm); |
8a2ab7f5 DH |
438 | if (create_elf_fdpic_tables(bprm, current->mm, |
439 | &exec_params, &interp_params) < 0) | |
19d860a1 | 440 | goto error; |
1da177e4 | 441 | |
8a2ab7f5 DH |
442 | kdebug("- start_code %lx", current->mm->start_code); |
443 | kdebug("- end_code %lx", current->mm->end_code); | |
444 | kdebug("- start_data %lx", current->mm->start_data); | |
445 | kdebug("- end_data %lx", current->mm->end_data); | |
446 | kdebug("- start_brk %lx", current->mm->start_brk); | |
447 | kdebug("- brk %lx", current->mm->brk); | |
448 | kdebug("- start_stack %lx", current->mm->start_stack); | |
1da177e4 LT |
449 | |
450 | #ifdef ELF_FDPIC_PLAT_INIT | |
451 | /* | |
452 | * The ABI may specify that certain registers be set up in special | |
453 | * ways (on i386 %edx is the address of a DT_FINI function, for | |
454 | * example. This macro performs whatever initialization to | |
455 | * the regs structure is required. | |
456 | */ | |
8a2ab7f5 DH |
457 | dynaddr = interp_params.dynamic_addr ?: exec_params.dynamic_addr; |
458 | ELF_FDPIC_PLAT_INIT(regs, exec_params.map_addr, interp_params.map_addr, | |
459 | dynaddr); | |
1da177e4 LT |
460 | #endif |
461 | ||
b8383831 | 462 | finalize_exec(bprm); |
1da177e4 | 463 | /* everything is now ready... get the userspace context ready to roll */ |
8a2ab7f5 DH |
464 | entryaddr = interp_params.entry_addr ?: exec_params.entry_addr; |
465 | start_thread(regs, entryaddr, current->mm->start_stack); | |
1da177e4 | 466 | |
1da177e4 LT |
467 | retval = 0; |
468 | ||
469 | error: | |
470 | if (interpreter) { | |
471 | allow_write_access(interpreter); | |
472 | fput(interpreter); | |
473 | } | |
f99d49ad JJ |
474 | kfree(interpreter_name); |
475 | kfree(exec_params.phdrs); | |
476 | kfree(exec_params.loadmap); | |
477 | kfree(interp_params.phdrs); | |
478 | kfree(interp_params.loadmap); | |
1da177e4 | 479 | return retval; |
8a2ab7f5 | 480 | } |
1da177e4 LT |
481 | |
482 | /*****************************************************************************/ | |
ec23847d PM |
483 | |
484 | #ifndef ELF_BASE_PLATFORM | |
485 | /* | |
486 | * AT_BASE_PLATFORM indicates the "real" hardware/microarchitecture. | |
487 | * If the arch defines ELF_BASE_PLATFORM (in asm/elf.h), the value | |
488 | * will be copied to the user stack in the same manner as AT_PLATFORM. | |
489 | */ | |
490 | #define ELF_BASE_PLATFORM NULL | |
491 | #endif | |
492 | ||
1da177e4 | 493 | /* |
c7637941 PM |
494 | * present useful information to the program by shovelling it onto the new |
495 | * process's stack | |
1da177e4 LT |
496 | */ |
497 | static int create_elf_fdpic_tables(struct linux_binprm *bprm, | |
498 | struct mm_struct *mm, | |
499 | struct elf_fdpic_params *exec_params, | |
500 | struct elf_fdpic_params *interp_params) | |
501 | { | |
86a264ab | 502 | const struct cred *cred = current_cred(); |
1da177e4 | 503 | unsigned long sp, csp, nitems; |
530018bf | 504 | elf_caddr_t __user *argv, *envp; |
1da177e4 | 505 | size_t platform_len = 0, len; |
ec23847d PM |
506 | char *k_platform, *k_base_platform; |
507 | char __user *u_platform, *u_base_platform, *p; | |
1da177e4 | 508 | int loop; |
9b14ec35 | 509 | int nr; /* reset for each csp adjustment */ |
1da177e4 | 510 | |
1da177e4 | 511 | #ifdef CONFIG_MMU |
c7637941 PM |
512 | /* In some cases (e.g. Hyper-Threading), we want to avoid L1 evictions |
513 | * by the processes running on the same package. One thing we can do is | |
514 | * to shuffle the initial stack for them, so we give the architecture | |
515 | * an opportunity to do so here. | |
516 | */ | |
517 | sp = arch_align_stack(bprm->p); | |
1da177e4 LT |
518 | #else |
519 | sp = mm->start_stack; | |
520 | ||
521 | /* stack the program arguments and environment */ | |
7e7ec6a9 | 522 | if (transfer_args_to_stack(bprm, &sp) < 0) |
1da177e4 | 523 | return -EFAULT; |
7e7ec6a9 | 524 | sp &= ~15; |
1da177e4 LT |
525 | #endif |
526 | ||
ec23847d PM |
527 | /* |
528 | * If this architecture has a platform capability string, copy it | |
529 | * to userspace. In some cases (Sparc), this info is impossible | |
530 | * for userspace to get any other way, in others (i386) it is | |
531 | * merely difficult. | |
532 | */ | |
1da177e4 | 533 | k_platform = ELF_PLATFORM; |
1aeb21d6 | 534 | u_platform = NULL; |
1da177e4 LT |
535 | |
536 | if (k_platform) { | |
537 | platform_len = strlen(k_platform) + 1; | |
538 | sp -= platform_len; | |
530018bf | 539 | u_platform = (char __user *) sp; |
1da177e4 LT |
540 | if (__copy_to_user(u_platform, k_platform, platform_len) != 0) |
541 | return -EFAULT; | |
542 | } | |
543 | ||
ec23847d PM |
544 | /* |
545 | * If this architecture has a "base" platform capability | |
546 | * string, copy it to userspace. | |
547 | */ | |
548 | k_base_platform = ELF_BASE_PLATFORM; | |
549 | u_base_platform = NULL; | |
550 | ||
551 | if (k_base_platform) { | |
552 | platform_len = strlen(k_base_platform) + 1; | |
553 | sp -= platform_len; | |
554 | u_base_platform = (char __user *) sp; | |
555 | if (__copy_to_user(u_base_platform, k_base_platform, platform_len) != 0) | |
556 | return -EFAULT; | |
557 | } | |
558 | ||
1da177e4 LT |
559 | sp &= ~7UL; |
560 | ||
561 | /* stack the load map(s) */ | |
562 | len = sizeof(struct elf32_fdpic_loadmap); | |
563 | len += sizeof(struct elf32_fdpic_loadseg) * exec_params->loadmap->nsegs; | |
564 | sp = (sp - len) & ~7UL; | |
565 | exec_params->map_addr = sp; | |
566 | ||
530018bf | 567 | if (copy_to_user((void __user *) sp, exec_params->loadmap, len) != 0) |
1da177e4 LT |
568 | return -EFAULT; |
569 | ||
570 | current->mm->context.exec_fdpic_loadmap = (unsigned long) sp; | |
571 | ||
572 | if (interp_params->loadmap) { | |
573 | len = sizeof(struct elf32_fdpic_loadmap); | |
8a2ab7f5 DH |
574 | len += sizeof(struct elf32_fdpic_loadseg) * |
575 | interp_params->loadmap->nsegs; | |
1da177e4 LT |
576 | sp = (sp - len) & ~7UL; |
577 | interp_params->map_addr = sp; | |
578 | ||
8a2ab7f5 DH |
579 | if (copy_to_user((void __user *) sp, interp_params->loadmap, |
580 | len) != 0) | |
1da177e4 LT |
581 | return -EFAULT; |
582 | ||
583 | current->mm->context.interp_fdpic_loadmap = (unsigned long) sp; | |
584 | } | |
585 | ||
586 | /* force 16 byte _final_ alignment here for generality */ | |
5edc2a51 | 587 | #define DLINFO_ITEMS 15 |
1da177e4 | 588 | |
ec23847d PM |
589 | nitems = 1 + DLINFO_ITEMS + (k_platform ? 1 : 0) + |
590 | (k_base_platform ? 1 : 0) + AT_VECTOR_SIZE_ARCH; | |
1da177e4 | 591 | |
5edc2a51 PM |
592 | if (bprm->interp_flags & BINPRM_FLAGS_EXECFD) |
593 | nitems++; | |
594 | ||
1da177e4 LT |
595 | csp = sp; |
596 | sp -= nitems * 2 * sizeof(unsigned long); | |
597 | sp -= (bprm->envc + 1) * sizeof(char *); /* envv[] */ | |
598 | sp -= (bprm->argc + 1) * sizeof(char *); /* argv[] */ | |
599 | sp -= 1 * sizeof(unsigned long); /* argc */ | |
600 | ||
601 | csp -= sp & 15UL; | |
602 | sp -= sp & 15UL; | |
603 | ||
604 | /* put the ELF interpreter info on the stack */ | |
9b14ec35 | 605 | #define NEW_AUX_ENT(id, val) \ |
8a2ab7f5 DH |
606 | do { \ |
607 | struct { unsigned long _id, _val; } __user *ent; \ | |
608 | \ | |
609 | ent = (void __user *) csp; \ | |
610 | __put_user((id), &ent[nr]._id); \ | |
611 | __put_user((val), &ent[nr]._val); \ | |
9b14ec35 | 612 | nr++; \ |
1da177e4 LT |
613 | } while (0) |
614 | ||
9b14ec35 | 615 | nr = 0; |
1da177e4 | 616 | csp -= 2 * sizeof(unsigned long); |
9b14ec35 | 617 | NEW_AUX_ENT(AT_NULL, 0); |
1da177e4 | 618 | if (k_platform) { |
9b14ec35 | 619 | nr = 0; |
1da177e4 | 620 | csp -= 2 * sizeof(unsigned long); |
9b14ec35 | 621 | NEW_AUX_ENT(AT_PLATFORM, |
8a2ab7f5 | 622 | (elf_addr_t) (unsigned long) u_platform); |
1da177e4 LT |
623 | } |
624 | ||
ec23847d PM |
625 | if (k_base_platform) { |
626 | nr = 0; | |
627 | csp -= 2 * sizeof(unsigned long); | |
628 | NEW_AUX_ENT(AT_BASE_PLATFORM, | |
629 | (elf_addr_t) (unsigned long) u_base_platform); | |
630 | } | |
631 | ||
5edc2a51 PM |
632 | if (bprm->interp_flags & BINPRM_FLAGS_EXECFD) { |
633 | nr = 0; | |
634 | csp -= 2 * sizeof(unsigned long); | |
635 | NEW_AUX_ENT(AT_EXECFD, bprm->interp_data); | |
636 | } | |
637 | ||
9b14ec35 | 638 | nr = 0; |
1da177e4 | 639 | csp -= DLINFO_ITEMS * 2 * sizeof(unsigned long); |
2171364d MN |
640 | NEW_AUX_ENT(AT_HWCAP, ELF_HWCAP); |
641 | #ifdef ELF_HWCAP2 | |
642 | NEW_AUX_ENT(AT_HWCAP2, ELF_HWCAP2); | |
643 | #endif | |
9b14ec35 PM |
644 | NEW_AUX_ENT(AT_PAGESZ, PAGE_SIZE); |
645 | NEW_AUX_ENT(AT_CLKTCK, CLOCKS_PER_SEC); | |
646 | NEW_AUX_ENT(AT_PHDR, exec_params->ph_addr); | |
647 | NEW_AUX_ENT(AT_PHENT, sizeof(struct elf_phdr)); | |
648 | NEW_AUX_ENT(AT_PHNUM, exec_params->hdr.e_phnum); | |
649 | NEW_AUX_ENT(AT_BASE, interp_params->elfhdr_addr); | |
650 | NEW_AUX_ENT(AT_FLAGS, 0); | |
651 | NEW_AUX_ENT(AT_ENTRY, exec_params->entry_addr); | |
ebc887b2 EB |
652 | NEW_AUX_ENT(AT_UID, (elf_addr_t) from_kuid_munged(cred->user_ns, cred->uid)); |
653 | NEW_AUX_ENT(AT_EUID, (elf_addr_t) from_kuid_munged(cred->user_ns, cred->euid)); | |
654 | NEW_AUX_ENT(AT_GID, (elf_addr_t) from_kgid_munged(cred->user_ns, cred->gid)); | |
655 | NEW_AUX_ENT(AT_EGID, (elf_addr_t) from_kgid_munged(cred->user_ns, cred->egid)); | |
c425e189 | 656 | NEW_AUX_ENT(AT_SECURE, bprm->secureexec); |
5edc2a51 | 657 | NEW_AUX_ENT(AT_EXECFN, bprm->exec); |
1da177e4 LT |
658 | |
659 | #ifdef ARCH_DLINFO | |
9b14ec35 PM |
660 | nr = 0; |
661 | csp -= AT_VECTOR_SIZE_ARCH * 2 * sizeof(unsigned long); | |
662 | ||
1da177e4 LT |
663 | /* ARCH_DLINFO must come last so platform specific code can enforce |
664 | * special alignment requirements on the AUXV if necessary (eg. PPC). | |
665 | */ | |
666 | ARCH_DLINFO; | |
667 | #endif | |
668 | #undef NEW_AUX_ENT | |
669 | ||
670 | /* allocate room for argv[] and envv[] */ | |
671 | csp -= (bprm->envc + 1) * sizeof(elf_caddr_t); | |
530018bf | 672 | envp = (elf_caddr_t __user *) csp; |
1da177e4 | 673 | csp -= (bprm->argc + 1) * sizeof(elf_caddr_t); |
530018bf | 674 | argv = (elf_caddr_t __user *) csp; |
1da177e4 LT |
675 | |
676 | /* stack argc */ | |
677 | csp -= sizeof(unsigned long); | |
530018bf | 678 | __put_user(bprm->argc, (unsigned long __user *) csp); |
1da177e4 | 679 | |
88bcd512 | 680 | BUG_ON(csp != sp); |
1da177e4 LT |
681 | |
682 | /* fill in the argv[] array */ | |
683 | #ifdef CONFIG_MMU | |
684 | current->mm->arg_start = bprm->p; | |
685 | #else | |
8a2ab7f5 DH |
686 | current->mm->arg_start = current->mm->start_stack - |
687 | (MAX_ARG_PAGES * PAGE_SIZE - bprm->p); | |
1da177e4 LT |
688 | #endif |
689 | ||
530018bf | 690 | p = (char __user *) current->mm->arg_start; |
1da177e4 LT |
691 | for (loop = bprm->argc; loop > 0; loop--) { |
692 | __put_user((elf_caddr_t) p, argv++); | |
b6a2fea3 OW |
693 | len = strnlen_user(p, MAX_ARG_STRLEN); |
694 | if (!len || len > MAX_ARG_STRLEN) | |
1da177e4 LT |
695 | return -EINVAL; |
696 | p += len; | |
697 | } | |
698 | __put_user(NULL, argv); | |
699 | current->mm->arg_end = (unsigned long) p; | |
700 | ||
701 | /* fill in the envv[] array */ | |
702 | current->mm->env_start = (unsigned long) p; | |
703 | for (loop = bprm->envc; loop > 0; loop--) { | |
704 | __put_user((elf_caddr_t)(unsigned long) p, envp++); | |
b6a2fea3 OW |
705 | len = strnlen_user(p, MAX_ARG_STRLEN); |
706 | if (!len || len > MAX_ARG_STRLEN) | |
1da177e4 LT |
707 | return -EINVAL; |
708 | p += len; | |
709 | } | |
710 | __put_user(NULL, envp); | |
711 | current->mm->env_end = (unsigned long) p; | |
712 | ||
713 | mm->start_stack = (unsigned long) sp; | |
714 | return 0; | |
8a2ab7f5 | 715 | } |
1da177e4 LT |
716 | |
717 | /*****************************************************************************/ | |
1da177e4 LT |
718 | /* |
719 | * load the appropriate binary image (executable or interpreter) into memory | |
720 | * - we assume no MMU is available | |
721 | * - if no other PIC bits are set in params->hdr->e_flags | |
722 | * - we assume that the LOADable segments in the binary are independently relocatable | |
723 | * - we assume R/O executable segments are shareable | |
724 | * - else | |
725 | * - we assume the loadable parts of the image to require fixed displacement | |
726 | * - the image is not shareable | |
727 | */ | |
728 | static int elf_fdpic_map_file(struct elf_fdpic_params *params, | |
729 | struct file *file, | |
730 | struct mm_struct *mm, | |
731 | const char *what) | |
732 | { | |
733 | struct elf32_fdpic_loadmap *loadmap; | |
734 | #ifdef CONFIG_MMU | |
735 | struct elf32_fdpic_loadseg *mseg; | |
736 | #endif | |
737 | struct elf32_fdpic_loadseg *seg; | |
738 | struct elf32_phdr *phdr; | |
739 | unsigned long load_addr, stop; | |
740 | unsigned nloads, tmp; | |
741 | size_t size; | |
742 | int loop, ret; | |
743 | ||
744 | /* allocate a load map table */ | |
745 | nloads = 0; | |
746 | for (loop = 0; loop < params->hdr.e_phnum; loop++) | |
747 | if (params->phdrs[loop].p_type == PT_LOAD) | |
748 | nloads++; | |
749 | ||
750 | if (nloads == 0) | |
751 | return -ELIBBAD; | |
752 | ||
753 | size = sizeof(*loadmap) + nloads * sizeof(*seg); | |
b87576d5 | 754 | loadmap = kzalloc(size, GFP_KERNEL); |
1da177e4 LT |
755 | if (!loadmap) |
756 | return -ENOMEM; | |
757 | ||
758 | params->loadmap = loadmap; | |
1da177e4 LT |
759 | |
760 | loadmap->version = ELF32_FDPIC_LOADMAP_VERSION; | |
761 | loadmap->nsegs = nloads; | |
762 | ||
763 | load_addr = params->load_addr; | |
764 | seg = loadmap->segs; | |
765 | ||
766 | /* map the requested LOADs into the memory space */ | |
767 | switch (params->flags & ELF_FDPIC_FLAG_ARRANGEMENT) { | |
768 | case ELF_FDPIC_FLAG_CONSTDISP: | |
769 | case ELF_FDPIC_FLAG_CONTIGUOUS: | |
770 | #ifndef CONFIG_MMU | |
771 | ret = elf_fdpic_map_file_constdisp_on_uclinux(params, file, mm); | |
772 | if (ret < 0) | |
773 | return ret; | |
774 | break; | |
775 | #endif | |
776 | default: | |
777 | ret = elf_fdpic_map_file_by_direct_mmap(params, file, mm); | |
778 | if (ret < 0) | |
779 | return ret; | |
780 | break; | |
781 | } | |
782 | ||
783 | /* map the entry point */ | |
784 | if (params->hdr.e_entry) { | |
785 | seg = loadmap->segs; | |
786 | for (loop = loadmap->nsegs; loop > 0; loop--, seg++) { | |
787 | if (params->hdr.e_entry >= seg->p_vaddr && | |
8a2ab7f5 | 788 | params->hdr.e_entry < seg->p_vaddr + seg->p_memsz) { |
1da177e4 | 789 | params->entry_addr = |
8a2ab7f5 DH |
790 | (params->hdr.e_entry - seg->p_vaddr) + |
791 | seg->addr; | |
1da177e4 LT |
792 | break; |
793 | } | |
794 | } | |
795 | } | |
796 | ||
797 | /* determine where the program header table has wound up if mapped */ | |
8a2ab7f5 DH |
798 | stop = params->hdr.e_phoff; |
799 | stop += params->hdr.e_phnum * sizeof (struct elf_phdr); | |
1da177e4 LT |
800 | phdr = params->phdrs; |
801 | ||
802 | for (loop = 0; loop < params->hdr.e_phnum; loop++, phdr++) { | |
803 | if (phdr->p_type != PT_LOAD) | |
804 | continue; | |
805 | ||
806 | if (phdr->p_offset > params->hdr.e_phoff || | |
807 | phdr->p_offset + phdr->p_filesz < stop) | |
808 | continue; | |
809 | ||
810 | seg = loadmap->segs; | |
811 | for (loop = loadmap->nsegs; loop > 0; loop--, seg++) { | |
812 | if (phdr->p_vaddr >= seg->p_vaddr && | |
8a2ab7f5 DH |
813 | phdr->p_vaddr + phdr->p_filesz <= |
814 | seg->p_vaddr + seg->p_memsz) { | |
815 | params->ph_addr = | |
816 | (phdr->p_vaddr - seg->p_vaddr) + | |
817 | seg->addr + | |
1da177e4 LT |
818 | params->hdr.e_phoff - phdr->p_offset; |
819 | break; | |
820 | } | |
821 | } | |
822 | break; | |
823 | } | |
824 | ||
825 | /* determine where the dynamic section has wound up if there is one */ | |
826 | phdr = params->phdrs; | |
827 | for (loop = 0; loop < params->hdr.e_phnum; loop++, phdr++) { | |
828 | if (phdr->p_type != PT_DYNAMIC) | |
829 | continue; | |
830 | ||
831 | seg = loadmap->segs; | |
832 | for (loop = loadmap->nsegs; loop > 0; loop--, seg++) { | |
833 | if (phdr->p_vaddr >= seg->p_vaddr && | |
8a2ab7f5 DH |
834 | phdr->p_vaddr + phdr->p_memsz <= |
835 | seg->p_vaddr + seg->p_memsz) { | |
cdf38888 NP |
836 | Elf32_Dyn __user *dyn; |
837 | Elf32_Sword d_tag; | |
838 | ||
8a2ab7f5 DH |
839 | params->dynamic_addr = |
840 | (phdr->p_vaddr - seg->p_vaddr) + | |
841 | seg->addr; | |
842 | ||
843 | /* check the dynamic section contains at least | |
844 | * one item, and that the last item is a NULL | |
845 | * entry */ | |
1da177e4 LT |
846 | if (phdr->p_memsz == 0 || |
847 | phdr->p_memsz % sizeof(Elf32_Dyn) != 0) | |
848 | goto dynamic_error; | |
849 | ||
850 | tmp = phdr->p_memsz / sizeof(Elf32_Dyn); | |
cdf38888 NP |
851 | dyn = (Elf32_Dyn __user *)params->dynamic_addr; |
852 | __get_user(d_tag, &dyn[tmp - 1].d_tag); | |
853 | if (d_tag != 0) | |
1da177e4 LT |
854 | goto dynamic_error; |
855 | break; | |
856 | } | |
857 | } | |
858 | break; | |
859 | } | |
860 | ||
861 | /* now elide adjacent segments in the load map on MMU linux | |
8a2ab7f5 DH |
862 | * - on uClinux the holes between may actually be filled with system |
863 | * stuff or stuff from other processes | |
1da177e4 LT |
864 | */ |
865 | #ifdef CONFIG_MMU | |
866 | nloads = loadmap->nsegs; | |
867 | mseg = loadmap->segs; | |
868 | seg = mseg + 1; | |
869 | for (loop = 1; loop < nloads; loop++) { | |
870 | /* see if we have a candidate for merging */ | |
871 | if (seg->p_vaddr - mseg->p_vaddr == seg->addr - mseg->addr) { | |
872 | load_addr = PAGE_ALIGN(mseg->addr + mseg->p_memsz); | |
873 | if (load_addr == (seg->addr & PAGE_MASK)) { | |
8a2ab7f5 DH |
874 | mseg->p_memsz += |
875 | load_addr - | |
876 | (mseg->addr + mseg->p_memsz); | |
1da177e4 LT |
877 | mseg->p_memsz += seg->addr & ~PAGE_MASK; |
878 | mseg->p_memsz += seg->p_memsz; | |
879 | loadmap->nsegs--; | |
880 | continue; | |
881 | } | |
882 | } | |
883 | ||
884 | mseg++; | |
885 | if (mseg != seg) | |
886 | *mseg = *seg; | |
887 | } | |
888 | #endif | |
889 | ||
890 | kdebug("Mapped Object [%s]:", what); | |
891 | kdebug("- elfhdr : %lx", params->elfhdr_addr); | |
892 | kdebug("- entry : %lx", params->entry_addr); | |
893 | kdebug("- PHDR[] : %lx", params->ph_addr); | |
894 | kdebug("- DYNAMIC[]: %lx", params->dynamic_addr); | |
895 | seg = loadmap->segs; | |
896 | for (loop = 0; loop < loadmap->nsegs; loop++, seg++) | |
897 | kdebug("- LOAD[%d] : %08x-%08x [va=%x ms=%x]", | |
898 | loop, | |
899 | seg->addr, seg->addr + seg->p_memsz - 1, | |
900 | seg->p_vaddr, seg->p_memsz); | |
901 | ||
902 | return 0; | |
903 | ||
8a2ab7f5 | 904 | dynamic_error: |
1da177e4 | 905 | printk("ELF FDPIC %s with invalid DYNAMIC section (inode=%lu)\n", |
496ad9aa | 906 | what, file_inode(file)->i_ino); |
1da177e4 | 907 | return -ELIBBAD; |
8a2ab7f5 | 908 | } |
1da177e4 LT |
909 | |
910 | /*****************************************************************************/ | |
911 | /* | |
912 | * map a file with constant displacement under uClinux | |
913 | */ | |
914 | #ifndef CONFIG_MMU | |
8a2ab7f5 DH |
915 | static int elf_fdpic_map_file_constdisp_on_uclinux( |
916 | struct elf_fdpic_params *params, | |
917 | struct file *file, | |
918 | struct mm_struct *mm) | |
1da177e4 LT |
919 | { |
920 | struct elf32_fdpic_loadseg *seg; | |
921 | struct elf32_phdr *phdr; | |
922 | unsigned long load_addr, base = ULONG_MAX, top = 0, maddr = 0, mflags; | |
1da177e4 LT |
923 | int loop, ret; |
924 | ||
925 | load_addr = params->load_addr; | |
926 | seg = params->loadmap->segs; | |
927 | ||
8a2ab7f5 DH |
928 | /* determine the bounds of the contiguous overall allocation we must |
929 | * make */ | |
1da177e4 LT |
930 | phdr = params->phdrs; |
931 | for (loop = 0; loop < params->hdr.e_phnum; loop++, phdr++) { | |
932 | if (params->phdrs[loop].p_type != PT_LOAD) | |
933 | continue; | |
934 | ||
935 | if (base > phdr->p_vaddr) | |
936 | base = phdr->p_vaddr; | |
937 | if (top < phdr->p_vaddr + phdr->p_memsz) | |
938 | top = phdr->p_vaddr + phdr->p_memsz; | |
939 | } | |
940 | ||
941 | /* allocate one big anon block for everything */ | |
942 | mflags = MAP_PRIVATE; | |
943 | if (params->flags & ELF_FDPIC_FLAG_EXECUTABLE) | |
944 | mflags |= MAP_EXECUTABLE; | |
945 | ||
6be5ceb0 | 946 | maddr = vm_mmap(NULL, load_addr, top - base, |
1da177e4 | 947 | PROT_READ | PROT_WRITE | PROT_EXEC, mflags, 0); |
8a2ab7f5 | 948 | if (IS_ERR_VALUE(maddr)) |
1da177e4 LT |
949 | return (int) maddr; |
950 | ||
951 | if (load_addr != 0) | |
952 | load_addr += PAGE_ALIGN(top - base); | |
953 | ||
954 | /* and then load the file segments into it */ | |
955 | phdr = params->phdrs; | |
956 | for (loop = 0; loop < params->hdr.e_phnum; loop++, phdr++) { | |
957 | if (params->phdrs[loop].p_type != PT_LOAD) | |
958 | continue; | |
959 | ||
1da177e4 LT |
960 | seg->addr = maddr + (phdr->p_vaddr - base); |
961 | seg->p_vaddr = phdr->p_vaddr; | |
962 | seg->p_memsz = phdr->p_memsz; | |
963 | ||
3dc20cb2 AV |
964 | ret = read_code(file, seg->addr, phdr->p_offset, |
965 | phdr->p_filesz); | |
1da177e4 LT |
966 | if (ret < 0) |
967 | return ret; | |
968 | ||
969 | /* map the ELF header address if in this segment */ | |
970 | if (phdr->p_offset == 0) | |
971 | params->elfhdr_addr = seg->addr; | |
972 | ||
973 | /* clear any space allocated but not loaded */ | |
ab4ad555 | 974 | if (phdr->p_filesz < phdr->p_memsz) { |
e30c7c3b TY |
975 | if (clear_user((void *) (seg->addr + phdr->p_filesz), |
976 | phdr->p_memsz - phdr->p_filesz)) | |
977 | return -EFAULT; | |
ab4ad555 | 978 | } |
1da177e4 LT |
979 | |
980 | if (mm) { | |
981 | if (phdr->p_flags & PF_X) { | |
aa289b47 DH |
982 | if (!mm->start_code) { |
983 | mm->start_code = seg->addr; | |
984 | mm->end_code = seg->addr + | |
985 | phdr->p_memsz; | |
986 | } | |
8a2ab7f5 | 987 | } else if (!mm->start_data) { |
1da177e4 | 988 | mm->start_data = seg->addr; |
1da177e4 | 989 | mm->end_data = seg->addr + phdr->p_memsz; |
1da177e4 | 990 | } |
1da177e4 LT |
991 | } |
992 | ||
993 | seg++; | |
994 | } | |
995 | ||
996 | return 0; | |
8a2ab7f5 | 997 | } |
1da177e4 LT |
998 | #endif |
999 | ||
1000 | /*****************************************************************************/ | |
1001 | /* | |
1002 | * map a binary by direct mmap() of the individual PT_LOAD segments | |
1003 | */ | |
1004 | static int elf_fdpic_map_file_by_direct_mmap(struct elf_fdpic_params *params, | |
1005 | struct file *file, | |
1006 | struct mm_struct *mm) | |
1007 | { | |
1008 | struct elf32_fdpic_loadseg *seg; | |
1009 | struct elf32_phdr *phdr; | |
1010 | unsigned long load_addr, delta_vaddr; | |
e30c7c3b | 1011 | int loop, dvset; |
1da177e4 LT |
1012 | |
1013 | load_addr = params->load_addr; | |
1014 | delta_vaddr = 0; | |
1015 | dvset = 0; | |
1016 | ||
1017 | seg = params->loadmap->segs; | |
1018 | ||
1019 | /* deal with each load segment separately */ | |
1020 | phdr = params->phdrs; | |
1021 | for (loop = 0; loop < params->hdr.e_phnum; loop++, phdr++) { | |
1022 | unsigned long maddr, disp, excess, excess1; | |
1023 | int prot = 0, flags; | |
1024 | ||
1025 | if (phdr->p_type != PT_LOAD) | |
1026 | continue; | |
1027 | ||
1028 | kdebug("[LOAD] va=%lx of=%lx fs=%lx ms=%lx", | |
1029 | (unsigned long) phdr->p_vaddr, | |
1030 | (unsigned long) phdr->p_offset, | |
1031 | (unsigned long) phdr->p_filesz, | |
1032 | (unsigned long) phdr->p_memsz); | |
1033 | ||
1034 | /* determine the mapping parameters */ | |
1035 | if (phdr->p_flags & PF_R) prot |= PROT_READ; | |
1036 | if (phdr->p_flags & PF_W) prot |= PROT_WRITE; | |
1037 | if (phdr->p_flags & PF_X) prot |= PROT_EXEC; | |
1038 | ||
1039 | flags = MAP_PRIVATE | MAP_DENYWRITE; | |
1040 | if (params->flags & ELF_FDPIC_FLAG_EXECUTABLE) | |
1041 | flags |= MAP_EXECUTABLE; | |
1042 | ||
1043 | maddr = 0; | |
1044 | ||
1045 | switch (params->flags & ELF_FDPIC_FLAG_ARRANGEMENT) { | |
1046 | case ELF_FDPIC_FLAG_INDEPENDENT: | |
1047 | /* PT_LOADs are independently locatable */ | |
1048 | break; | |
1049 | ||
1050 | case ELF_FDPIC_FLAG_HONOURVADDR: | |
1051 | /* the specified virtual address must be honoured */ | |
1052 | maddr = phdr->p_vaddr; | |
1053 | flags |= MAP_FIXED; | |
1054 | break; | |
1055 | ||
1056 | case ELF_FDPIC_FLAG_CONSTDISP: | |
1057 | /* constant displacement | |
8a2ab7f5 DH |
1058 | * - can be mapped anywhere, but must be mapped as a |
1059 | * unit | |
1da177e4 LT |
1060 | */ |
1061 | if (!dvset) { | |
1062 | maddr = load_addr; | |
1063 | delta_vaddr = phdr->p_vaddr; | |
1064 | dvset = 1; | |
8a2ab7f5 | 1065 | } else { |
1da177e4 LT |
1066 | maddr = load_addr + phdr->p_vaddr - delta_vaddr; |
1067 | flags |= MAP_FIXED; | |
1068 | } | |
1069 | break; | |
1070 | ||
1071 | case ELF_FDPIC_FLAG_CONTIGUOUS: | |
1072 | /* contiguity handled later */ | |
1073 | break; | |
1074 | ||
1075 | default: | |
1076 | BUG(); | |
1077 | } | |
1078 | ||
1079 | maddr &= PAGE_MASK; | |
1080 | ||
1081 | /* create the mapping */ | |
1082 | disp = phdr->p_vaddr & ~PAGE_MASK; | |
6be5ceb0 | 1083 | maddr = vm_mmap(file, maddr, phdr->p_memsz + disp, prot, flags, |
1da177e4 | 1084 | phdr->p_offset - disp); |
1da177e4 LT |
1085 | |
1086 | kdebug("mmap[%d] <file> sz=%lx pr=%x fl=%x of=%lx --> %08lx", | |
8a2ab7f5 DH |
1087 | loop, phdr->p_memsz + disp, prot, flags, |
1088 | phdr->p_offset - disp, maddr); | |
1da177e4 | 1089 | |
8a2ab7f5 | 1090 | if (IS_ERR_VALUE(maddr)) |
1da177e4 LT |
1091 | return (int) maddr; |
1092 | ||
8a2ab7f5 DH |
1093 | if ((params->flags & ELF_FDPIC_FLAG_ARRANGEMENT) == |
1094 | ELF_FDPIC_FLAG_CONTIGUOUS) | |
1da177e4 LT |
1095 | load_addr += PAGE_ALIGN(phdr->p_memsz + disp); |
1096 | ||
1097 | seg->addr = maddr + disp; | |
1098 | seg->p_vaddr = phdr->p_vaddr; | |
1099 | seg->p_memsz = phdr->p_memsz; | |
1100 | ||
1101 | /* map the ELF header address if in this segment */ | |
1102 | if (phdr->p_offset == 0) | |
1103 | params->elfhdr_addr = seg->addr; | |
1104 | ||
8a2ab7f5 DH |
1105 | /* clear the bit between beginning of mapping and beginning of |
1106 | * PT_LOAD */ | |
1da177e4 LT |
1107 | if (prot & PROT_WRITE && disp > 0) { |
1108 | kdebug("clear[%d] ad=%lx sz=%lx", loop, maddr, disp); | |
e30c7c3b TY |
1109 | if (clear_user((void __user *) maddr, disp)) |
1110 | return -EFAULT; | |
1da177e4 LT |
1111 | maddr += disp; |
1112 | } | |
1113 | ||
1114 | /* clear any space allocated but not loaded | |
1115 | * - on uClinux we can just clear the lot | |
1116 | * - on MMU linux we'll get a SIGBUS beyond the last page | |
1117 | * extant in the file | |
1118 | */ | |
1119 | excess = phdr->p_memsz - phdr->p_filesz; | |
1120 | excess1 = PAGE_SIZE - ((maddr + phdr->p_filesz) & ~PAGE_MASK); | |
1121 | ||
1122 | #ifdef CONFIG_MMU | |
1da177e4 LT |
1123 | if (excess > excess1) { |
1124 | unsigned long xaddr = maddr + phdr->p_filesz + excess1; | |
1125 | unsigned long xmaddr; | |
1126 | ||
1127 | flags |= MAP_FIXED | MAP_ANONYMOUS; | |
6be5ceb0 | 1128 | xmaddr = vm_mmap(NULL, xaddr, excess - excess1, |
8a2ab7f5 | 1129 | prot, flags, 0); |
1da177e4 LT |
1130 | |
1131 | kdebug("mmap[%d] <anon>" | |
1132 | " ad=%lx sz=%lx pr=%x fl=%x of=0 --> %08lx", | |
8a2ab7f5 DH |
1133 | loop, xaddr, excess - excess1, prot, flags, |
1134 | xmaddr); | |
1da177e4 LT |
1135 | |
1136 | if (xmaddr != xaddr) | |
1137 | return -ENOMEM; | |
1138 | } | |
1139 | ||
1140 | if (prot & PROT_WRITE && excess1 > 0) { | |
1141 | kdebug("clear[%d] ad=%lx sz=%lx", | |
1142 | loop, maddr + phdr->p_filesz, excess1); | |
e30c7c3b TY |
1143 | if (clear_user((void __user *) maddr + phdr->p_filesz, |
1144 | excess1)) | |
1145 | return -EFAULT; | |
1da177e4 LT |
1146 | } |
1147 | ||
1148 | #else | |
1149 | if (excess > 0) { | |
1150 | kdebug("clear[%d] ad=%lx sz=%lx", | |
1151 | loop, maddr + phdr->p_filesz, excess); | |
e30c7c3b TY |
1152 | if (clear_user((void *) maddr + phdr->p_filesz, excess)) |
1153 | return -EFAULT; | |
1da177e4 LT |
1154 | } |
1155 | #endif | |
1156 | ||
1157 | if (mm) { | |
1158 | if (phdr->p_flags & PF_X) { | |
aa289b47 DH |
1159 | if (!mm->start_code) { |
1160 | mm->start_code = maddr; | |
1161 | mm->end_code = maddr + phdr->p_memsz; | |
1162 | } | |
8a2ab7f5 | 1163 | } else if (!mm->start_data) { |
1da177e4 LT |
1164 | mm->start_data = maddr; |
1165 | mm->end_data = maddr + phdr->p_memsz; | |
1166 | } | |
1167 | } | |
1168 | ||
1169 | seg++; | |
1170 | } | |
1171 | ||
1172 | return 0; | |
8a2ab7f5 | 1173 | } |
6d8c4e3b DH |
1174 | |
1175 | /*****************************************************************************/ | |
1176 | /* | |
1177 | * ELF-FDPIC core dumper | |
1178 | * | |
1179 | * Modelled on fs/exec.c:aout_core_dump() | |
1180 | * Jeremy Fitzhardinge <jeremy@sw.oz.au> | |
1181 | * | |
1182 | * Modelled on fs/binfmt_elf.c core dumper | |
1183 | */ | |
698ba7b5 | 1184 | #ifdef CONFIG_ELF_CORE |
6d8c4e3b | 1185 | |
6d8c4e3b DH |
1186 | /* |
1187 | * Decide whether a segment is worth dumping; default is yes to be | |
1188 | * sure (missing info is worse than too much; etc). | |
1189 | * Personally I'd include everything, and use the coredump limit... | |
1190 | * | |
1191 | * I think we should skip something. But I am not sure how. H.J. | |
1192 | */ | |
ee78b0a6 | 1193 | static int maydump(struct vm_area_struct *vma, unsigned long mm_flags) |
6d8c4e3b | 1194 | { |
ee78b0a6 KH |
1195 | int dump_ok; |
1196 | ||
6d8c4e3b | 1197 | /* Do not dump I/O mapped devices or special mappings */ |
314e51b9 | 1198 | if (vma->vm_flags & VM_IO) { |
6d8c4e3b DH |
1199 | kdcore("%08lx: %08lx: no (IO)", vma->vm_start, vma->vm_flags); |
1200 | return 0; | |
1201 | } | |
1202 | ||
1203 | /* If we may not read the contents, don't allow us to dump | |
1204 | * them either. "dump_write()" can't handle it anyway. | |
1205 | */ | |
1206 | if (!(vma->vm_flags & VM_READ)) { | |
1207 | kdcore("%08lx: %08lx: no (!read)", vma->vm_start, vma->vm_flags); | |
1208 | return 0; | |
1209 | } | |
1210 | ||
ab27a8d0 RZ |
1211 | /* support for DAX */ |
1212 | if (vma_is_dax(vma)) { | |
1213 | if (vma->vm_flags & VM_SHARED) { | |
1214 | dump_ok = test_bit(MMF_DUMP_DAX_SHARED, &mm_flags); | |
1215 | kdcore("%08lx: %08lx: %s (DAX shared)", vma->vm_start, | |
1216 | vma->vm_flags, dump_ok ? "yes" : "no"); | |
1217 | } else { | |
1218 | dump_ok = test_bit(MMF_DUMP_DAX_PRIVATE, &mm_flags); | |
1219 | kdcore("%08lx: %08lx: %s (DAX private)", vma->vm_start, | |
1220 | vma->vm_flags, dump_ok ? "yes" : "no"); | |
1221 | } | |
1222 | return dump_ok; | |
1223 | } | |
1224 | ||
ee78b0a6 | 1225 | /* By default, dump shared memory if mapped from an anonymous file. */ |
6d8c4e3b | 1226 | if (vma->vm_flags & VM_SHARED) { |
496ad9aa | 1227 | if (file_inode(vma->vm_file)->i_nlink == 0) { |
ee78b0a6 KH |
1228 | dump_ok = test_bit(MMF_DUMP_ANON_SHARED, &mm_flags); |
1229 | kdcore("%08lx: %08lx: %s (share)", vma->vm_start, | |
1230 | vma->vm_flags, dump_ok ? "yes" : "no"); | |
1231 | return dump_ok; | |
6d8c4e3b DH |
1232 | } |
1233 | ||
ee78b0a6 KH |
1234 | dump_ok = test_bit(MMF_DUMP_MAPPED_SHARED, &mm_flags); |
1235 | kdcore("%08lx: %08lx: %s (share)", vma->vm_start, | |
1236 | vma->vm_flags, dump_ok ? "yes" : "no"); | |
1237 | return dump_ok; | |
6d8c4e3b DH |
1238 | } |
1239 | ||
1240 | #ifdef CONFIG_MMU | |
ee78b0a6 | 1241 | /* By default, if it hasn't been written to, don't write it out */ |
6d8c4e3b | 1242 | if (!vma->anon_vma) { |
ee78b0a6 KH |
1243 | dump_ok = test_bit(MMF_DUMP_MAPPED_PRIVATE, &mm_flags); |
1244 | kdcore("%08lx: %08lx: %s (!anon)", vma->vm_start, | |
1245 | vma->vm_flags, dump_ok ? "yes" : "no"); | |
1246 | return dump_ok; | |
6d8c4e3b DH |
1247 | } |
1248 | #endif | |
1249 | ||
ee78b0a6 KH |
1250 | dump_ok = test_bit(MMF_DUMP_ANON_PRIVATE, &mm_flags); |
1251 | kdcore("%08lx: %08lx: %s", vma->vm_start, vma->vm_flags, | |
1252 | dump_ok ? "yes" : "no"); | |
1253 | return dump_ok; | |
6d8c4e3b DH |
1254 | } |
1255 | ||
1256 | /* An ELF note in memory */ | |
1257 | struct memelfnote | |
1258 | { | |
1259 | const char *name; | |
1260 | int type; | |
1261 | unsigned int datasz; | |
1262 | void *data; | |
1263 | }; | |
1264 | ||
1265 | static int notesize(struct memelfnote *en) | |
1266 | { | |
1267 | int sz; | |
1268 | ||
1269 | sz = sizeof(struct elf_note); | |
1270 | sz += roundup(strlen(en->name) + 1, 4); | |
1271 | sz += roundup(en->datasz, 4); | |
1272 | ||
1273 | return sz; | |
1274 | } | |
1275 | ||
1276 | /* #define DEBUG */ | |
1277 | ||
e6c1baa9 | 1278 | static int writenote(struct memelfnote *men, struct coredump_params *cprm) |
05f47fda DH |
1279 | { |
1280 | struct elf_note en; | |
6d8c4e3b DH |
1281 | en.n_namesz = strlen(men->name) + 1; |
1282 | en.n_descsz = men->datasz; | |
1283 | en.n_type = men->type; | |
1284 | ||
e6c1baa9 | 1285 | return dump_emit(cprm, &en, sizeof(en)) && |
22a8cb82 AV |
1286 | dump_emit(cprm, men->name, en.n_namesz) && dump_align(cprm, 4) && |
1287 | dump_emit(cprm, men->data, men->datasz) && dump_align(cprm, 4); | |
6d8c4e3b | 1288 | } |
6d8c4e3b | 1289 | |
6d8c4e3b DH |
1290 | static inline void fill_elf_fdpic_header(struct elfhdr *elf, int segs) |
1291 | { | |
1292 | memcpy(elf->e_ident, ELFMAG, SELFMAG); | |
1293 | elf->e_ident[EI_CLASS] = ELF_CLASS; | |
1294 | elf->e_ident[EI_DATA] = ELF_DATA; | |
1295 | elf->e_ident[EI_VERSION] = EV_CURRENT; | |
1296 | elf->e_ident[EI_OSABI] = ELF_OSABI; | |
1297 | memset(elf->e_ident+EI_PAD, 0, EI_NIDENT-EI_PAD); | |
1298 | ||
1299 | elf->e_type = ET_CORE; | |
1300 | elf->e_machine = ELF_ARCH; | |
1301 | elf->e_version = EV_CURRENT; | |
1302 | elf->e_entry = 0; | |
1303 | elf->e_phoff = sizeof(struct elfhdr); | |
1304 | elf->e_shoff = 0; | |
1305 | elf->e_flags = ELF_FDPIC_CORE_EFLAGS; | |
1306 | elf->e_ehsize = sizeof(struct elfhdr); | |
1307 | elf->e_phentsize = sizeof(struct elf_phdr); | |
1308 | elf->e_phnum = segs; | |
1309 | elf->e_shentsize = 0; | |
1310 | elf->e_shnum = 0; | |
1311 | elf->e_shstrndx = 0; | |
1312 | return; | |
1313 | } | |
1314 | ||
1315 | static inline void fill_elf_note_phdr(struct elf_phdr *phdr, int sz, loff_t offset) | |
1316 | { | |
1317 | phdr->p_type = PT_NOTE; | |
1318 | phdr->p_offset = offset; | |
1319 | phdr->p_vaddr = 0; | |
1320 | phdr->p_paddr = 0; | |
1321 | phdr->p_filesz = sz; | |
1322 | phdr->p_memsz = 0; | |
1323 | phdr->p_flags = 0; | |
1324 | phdr->p_align = 0; | |
1325 | return; | |
1326 | } | |
1327 | ||
1328 | static inline void fill_note(struct memelfnote *note, const char *name, int type, | |
1329 | unsigned int sz, void *data) | |
1330 | { | |
1331 | note->name = name; | |
1332 | note->type = type; | |
1333 | note->datasz = sz; | |
1334 | note->data = data; | |
1335 | return; | |
1336 | } | |
1337 | ||
1338 | /* | |
1339 | * fill up all the fields in prstatus from the given task struct, except | |
3ad2f3fb | 1340 | * registers which need to be filled up separately. |
6d8c4e3b DH |
1341 | */ |
1342 | static void fill_prstatus(struct elf_prstatus *prstatus, | |
1343 | struct task_struct *p, long signr) | |
1344 | { | |
1345 | prstatus->pr_info.si_signo = prstatus->pr_cursig = signr; | |
1346 | prstatus->pr_sigpend = p->pending.signal.sig[0]; | |
1347 | prstatus->pr_sighold = p->blocked.sig[0]; | |
3b34fc58 ON |
1348 | rcu_read_lock(); |
1349 | prstatus->pr_ppid = task_pid_vnr(rcu_dereference(p->real_parent)); | |
1350 | rcu_read_unlock(); | |
b488893a | 1351 | prstatus->pr_pid = task_pid_vnr(p); |
b488893a PE |
1352 | prstatus->pr_pgrp = task_pgrp_vnr(p); |
1353 | prstatus->pr_sid = task_session_vnr(p); | |
6d8c4e3b | 1354 | if (thread_group_leader(p)) { |
cd19c364 | 1355 | struct task_cputime cputime; |
2515ddc6 | 1356 | |
6d8c4e3b | 1357 | /* |
2515ddc6 PM |
1358 | * This is the record for the group leader. It shows the |
1359 | * group-wide total, not its individual thread total. | |
6d8c4e3b | 1360 | */ |
cd19c364 | 1361 | thread_group_cputime(p, &cputime); |
e2bb80d5 AB |
1362 | prstatus->pr_utime = ns_to_kernel_old_timeval(cputime.utime); |
1363 | prstatus->pr_stime = ns_to_kernel_old_timeval(cputime.stime); | |
6d8c4e3b | 1364 | } else { |
cd19c364 | 1365 | u64 utime, stime; |
6fac4829 | 1366 | |
cd19c364 | 1367 | task_cputime(p, &utime, &stime); |
e2bb80d5 AB |
1368 | prstatus->pr_utime = ns_to_kernel_old_timeval(utime); |
1369 | prstatus->pr_stime = ns_to_kernel_old_timeval(stime); | |
6d8c4e3b | 1370 | } |
e2bb80d5 AB |
1371 | prstatus->pr_cutime = ns_to_kernel_old_timeval(p->signal->cutime); |
1372 | prstatus->pr_cstime = ns_to_kernel_old_timeval(p->signal->cstime); | |
6d8c4e3b DH |
1373 | |
1374 | prstatus->pr_exec_fdpic_loadmap = p->mm->context.exec_fdpic_loadmap; | |
1375 | prstatus->pr_interp_fdpic_loadmap = p->mm->context.interp_fdpic_loadmap; | |
1376 | } | |
1377 | ||
1378 | static int fill_psinfo(struct elf_prpsinfo *psinfo, struct task_struct *p, | |
1379 | struct mm_struct *mm) | |
1380 | { | |
c69e8d9c | 1381 | const struct cred *cred; |
6d8c4e3b DH |
1382 | unsigned int i, len; |
1383 | ||
1384 | /* first copy the parameters from user space */ | |
1385 | memset(psinfo, 0, sizeof(struct elf_prpsinfo)); | |
1386 | ||
1387 | len = mm->arg_end - mm->arg_start; | |
1388 | if (len >= ELF_PRARGSZ) | |
1389 | len = ELF_PRARGSZ - 1; | |
1390 | if (copy_from_user(&psinfo->pr_psargs, | |
1391 | (const char __user *) mm->arg_start, len)) | |
1392 | return -EFAULT; | |
1393 | for (i = 0; i < len; i++) | |
1394 | if (psinfo->pr_psargs[i] == 0) | |
1395 | psinfo->pr_psargs[i] = ' '; | |
1396 | psinfo->pr_psargs[len] = 0; | |
1397 | ||
3b34fc58 ON |
1398 | rcu_read_lock(); |
1399 | psinfo->pr_ppid = task_pid_vnr(rcu_dereference(p->real_parent)); | |
1400 | rcu_read_unlock(); | |
b488893a | 1401 | psinfo->pr_pid = task_pid_vnr(p); |
b488893a PE |
1402 | psinfo->pr_pgrp = task_pgrp_vnr(p); |
1403 | psinfo->pr_sid = task_session_vnr(p); | |
6d8c4e3b DH |
1404 | |
1405 | i = p->state ? ffz(~p->state) + 1 : 0; | |
1406 | psinfo->pr_state = i; | |
1407 | psinfo->pr_sname = (i > 5) ? '.' : "RSDTZW"[i]; | |
1408 | psinfo->pr_zomb = psinfo->pr_sname == 'Z'; | |
1409 | psinfo->pr_nice = task_nice(p); | |
1410 | psinfo->pr_flag = p->flags; | |
c69e8d9c DH |
1411 | rcu_read_lock(); |
1412 | cred = __task_cred(p); | |
ebc887b2 EB |
1413 | SET_UID(psinfo->pr_uid, from_kuid_munged(cred->user_ns, cred->uid)); |
1414 | SET_GID(psinfo->pr_gid, from_kgid_munged(cred->user_ns, cred->gid)); | |
c69e8d9c | 1415 | rcu_read_unlock(); |
6d8c4e3b DH |
1416 | strncpy(psinfo->pr_fname, p->comm, sizeof(psinfo->pr_fname)); |
1417 | ||
1418 | return 0; | |
1419 | } | |
1420 | ||
1421 | /* Here is the structure in which status of each thread is captured. */ | |
1422 | struct elf_thread_status | |
1423 | { | |
1424 | struct list_head list; | |
1425 | struct elf_prstatus prstatus; /* NT_PRSTATUS */ | |
1426 | elf_fpregset_t fpu; /* NT_PRFPREG */ | |
1427 | struct task_struct *thread; | |
1428 | #ifdef ELF_CORE_COPY_XFPREGS | |
5b20cd80 | 1429 | elf_fpxregset_t xfpu; /* ELF_CORE_XFPREG_TYPE */ |
6d8c4e3b DH |
1430 | #endif |
1431 | struct memelfnote notes[3]; | |
1432 | int num_notes; | |
1433 | }; | |
1434 | ||
1435 | /* | |
1436 | * In order to add the specific thread information for the elf file format, | |
1437 | * we need to keep a linked list of every thread's pr_status and then create | |
1438 | * a single section for them in the final core file. | |
1439 | */ | |
1440 | static int elf_dump_thread_status(long signr, struct elf_thread_status *t) | |
1441 | { | |
1442 | struct task_struct *p = t->thread; | |
1443 | int sz = 0; | |
1444 | ||
1445 | t->num_notes = 0; | |
1446 | ||
1447 | fill_prstatus(&t->prstatus, p, signr); | |
1448 | elf_core_copy_task_regs(p, &t->prstatus.pr_reg); | |
1449 | ||
1450 | fill_note(&t->notes[0], "CORE", NT_PRSTATUS, sizeof(t->prstatus), | |
1451 | &t->prstatus); | |
1452 | t->num_notes++; | |
1453 | sz += notesize(&t->notes[0]); | |
1454 | ||
1455 | t->prstatus.pr_fpvalid = elf_core_copy_task_fpregs(p, NULL, &t->fpu); | |
1456 | if (t->prstatus.pr_fpvalid) { | |
1457 | fill_note(&t->notes[1], "CORE", NT_PRFPREG, sizeof(t->fpu), | |
1458 | &t->fpu); | |
1459 | t->num_notes++; | |
1460 | sz += notesize(&t->notes[1]); | |
1461 | } | |
1462 | ||
1463 | #ifdef ELF_CORE_COPY_XFPREGS | |
1464 | if (elf_core_copy_task_xfpregs(p, &t->xfpu)) { | |
5b20cd80 MN |
1465 | fill_note(&t->notes[2], "LINUX", ELF_CORE_XFPREG_TYPE, |
1466 | sizeof(t->xfpu), &t->xfpu); | |
6d8c4e3b DH |
1467 | t->num_notes++; |
1468 | sz += notesize(&t->notes[2]); | |
1469 | } | |
1470 | #endif | |
1471 | return sz; | |
1472 | } | |
1473 | ||
8d9032bb DH |
1474 | static void fill_extnum_info(struct elfhdr *elf, struct elf_shdr *shdr4extnum, |
1475 | elf_addr_t e_shoff, int segs) | |
1476 | { | |
1477 | elf->e_shoff = e_shoff; | |
1478 | elf->e_shentsize = sizeof(*shdr4extnum); | |
1479 | elf->e_shnum = 1; | |
1480 | elf->e_shstrndx = SHN_UNDEF; | |
1481 | ||
1482 | memset(shdr4extnum, 0, sizeof(*shdr4extnum)); | |
1483 | ||
1484 | shdr4extnum->sh_type = SHT_NULL; | |
1485 | shdr4extnum->sh_size = elf->e_shnum; | |
1486 | shdr4extnum->sh_link = elf->e_shstrndx; | |
1487 | shdr4extnum->sh_info = segs; | |
1488 | } | |
1489 | ||
6d8c4e3b DH |
1490 | /* |
1491 | * dump the segments for an MMU process | |
1492 | */ | |
e6c1baa9 | 1493 | static bool elf_fdpic_dump_segments(struct coredump_params *cprm) |
6d8c4e3b DH |
1494 | { |
1495 | struct vm_area_struct *vma; | |
1496 | ||
1497 | for (vma = current->mm->mmap; vma; vma = vma->vm_next) { | |
11e3e8d6 | 1498 | #ifdef CONFIG_MMU |
6d8c4e3b | 1499 | unsigned long addr; |
11e3e8d6 | 1500 | #endif |
6d8c4e3b | 1501 | |
e6c1baa9 | 1502 | if (!maydump(vma, cprm->mm_flags)) |
6d8c4e3b DH |
1503 | continue; |
1504 | ||
e6c1baa9 | 1505 | #ifdef CONFIG_MMU |
f3e8fccd HD |
1506 | for (addr = vma->vm_start; addr < vma->vm_end; |
1507 | addr += PAGE_SIZE) { | |
e6c1baa9 | 1508 | bool res; |
f3e8fccd HD |
1509 | struct page *page = get_dump_page(addr); |
1510 | if (page) { | |
1511 | void *kaddr = kmap(page); | |
e6c1baa9 | 1512 | res = dump_emit(cprm, kaddr, PAGE_SIZE); |
6d8c4e3b | 1513 | kunmap(page); |
09cbfeaf | 1514 | put_page(page); |
e6c1baa9 | 1515 | } else { |
9b56d543 | 1516 | res = dump_skip(cprm, PAGE_SIZE); |
e6c1baa9 AV |
1517 | } |
1518 | if (!res) | |
1519 | return false; | |
6d8c4e3b | 1520 | } |
e6c1baa9 AV |
1521 | #else |
1522 | if (!dump_emit(cprm, (void *) vma->vm_start, | |
6d8c4e3b | 1523 | vma->vm_end - vma->vm_start)) |
e6c1baa9 AV |
1524 | return false; |
1525 | #endif | |
6d8c4e3b | 1526 | } |
e6c1baa9 | 1527 | return true; |
6d8c4e3b | 1528 | } |
6d8c4e3b | 1529 | |
8d9032bb DH |
1530 | static size_t elf_core_vma_data_size(unsigned long mm_flags) |
1531 | { | |
1532 | struct vm_area_struct *vma; | |
1533 | size_t size = 0; | |
1534 | ||
47568d4c | 1535 | for (vma = current->mm->mmap; vma; vma = vma->vm_next) |
8d9032bb DH |
1536 | if (maydump(vma, mm_flags)) |
1537 | size += vma->vm_end - vma->vm_start; | |
1538 | return size; | |
1539 | } | |
1540 | ||
6d8c4e3b DH |
1541 | /* |
1542 | * Actual dumper | |
1543 | * | |
1544 | * This is a two-pass process; first we find the offsets of the bits, | |
1545 | * and then they are actually written out. If we run out of core limit | |
1546 | * we just truncate. | |
1547 | */ | |
f6151dfe | 1548 | static int elf_fdpic_core_dump(struct coredump_params *cprm) |
6d8c4e3b DH |
1549 | { |
1550 | #define NUM_NOTES 6 | |
1551 | int has_dumped = 0; | |
1552 | mm_segment_t fs; | |
1553 | int segs; | |
6d8c4e3b DH |
1554 | int i; |
1555 | struct vm_area_struct *vma; | |
1556 | struct elfhdr *elf = NULL; | |
9b56d543 | 1557 | loff_t offset = 0, dataoff; |
6d8c4e3b DH |
1558 | int numnote; |
1559 | struct memelfnote *notes = NULL; | |
1560 | struct elf_prstatus *prstatus = NULL; /* NT_PRSTATUS */ | |
1561 | struct elf_prpsinfo *psinfo = NULL; /* NT_PRPSINFO */ | |
6d8c4e3b DH |
1562 | LIST_HEAD(thread_list); |
1563 | struct list_head *t; | |
1564 | elf_fpregset_t *fpu = NULL; | |
1565 | #ifdef ELF_CORE_COPY_XFPREGS | |
1566 | elf_fpxregset_t *xfpu = NULL; | |
1567 | #endif | |
1568 | int thread_status_size = 0; | |
6d8c4e3b | 1569 | elf_addr_t *auxv; |
93eb211e | 1570 | struct elf_phdr *phdr4note = NULL; |
8d9032bb DH |
1571 | struct elf_shdr *shdr4extnum = NULL; |
1572 | Elf_Half e_phnum; | |
1573 | elf_addr_t e_shoff; | |
afabada9 AV |
1574 | struct core_thread *ct; |
1575 | struct elf_thread_status *tmp; | |
6d8c4e3b DH |
1576 | |
1577 | /* | |
1578 | * We no longer stop all VM operations. | |
1579 | * | |
1580 | * This is because those proceses that could possibly change map_count | |
1581 | * or the mmap / vma pages are now blocked in do_exit on current | |
1582 | * finishing this core dump. | |
1583 | * | |
1584 | * Only ptrace can touch these memory addresses, but it doesn't change | |
1585 | * the map_count or the pages allocated. So no possibility of crashing | |
1586 | * exists while dumping the mm->vm_next areas to the core file. | |
1587 | */ | |
1588 | ||
1589 | /* alloc memory for large data structures: too large to be on stack */ | |
1590 | elf = kmalloc(sizeof(*elf), GFP_KERNEL); | |
1591 | if (!elf) | |
1592 | goto cleanup; | |
1593 | prstatus = kzalloc(sizeof(*prstatus), GFP_KERNEL); | |
1594 | if (!prstatus) | |
1595 | goto cleanup; | |
1596 | psinfo = kmalloc(sizeof(*psinfo), GFP_KERNEL); | |
1597 | if (!psinfo) | |
1598 | goto cleanup; | |
6da2ec56 KC |
1599 | notes = kmalloc_array(NUM_NOTES, sizeof(struct memelfnote), |
1600 | GFP_KERNEL); | |
6d8c4e3b DH |
1601 | if (!notes) |
1602 | goto cleanup; | |
1603 | fpu = kmalloc(sizeof(*fpu), GFP_KERNEL); | |
1604 | if (!fpu) | |
1605 | goto cleanup; | |
1606 | #ifdef ELF_CORE_COPY_XFPREGS | |
1607 | xfpu = kmalloc(sizeof(*xfpu), GFP_KERNEL); | |
1608 | if (!xfpu) | |
1609 | goto cleanup; | |
1610 | #endif | |
1611 | ||
afabada9 AV |
1612 | for (ct = current->mm->core_state->dumper.next; |
1613 | ct; ct = ct->next) { | |
1614 | tmp = kzalloc(sizeof(*tmp), GFP_KERNEL); | |
1615 | if (!tmp) | |
1616 | goto cleanup; | |
182c515f | 1617 | |
afabada9 AV |
1618 | tmp->thread = ct->task; |
1619 | list_add(&tmp->list, &thread_list); | |
1620 | } | |
182c515f | 1621 | |
afabada9 AV |
1622 | list_for_each(t, &thread_list) { |
1623 | struct elf_thread_status *tmp; | |
1624 | int sz; | |
6d8c4e3b | 1625 | |
afabada9 AV |
1626 | tmp = list_entry(t, struct elf_thread_status, list); |
1627 | sz = elf_dump_thread_status(cprm->siginfo->si_signo, tmp); | |
1628 | thread_status_size += sz; | |
6d8c4e3b DH |
1629 | } |
1630 | ||
1631 | /* now collect the dump for the current */ | |
5ab1c309 | 1632 | fill_prstatus(prstatus, current, cprm->siginfo->si_signo); |
f6151dfe | 1633 | elf_core_copy_regs(&prstatus->pr_reg, cprm->regs); |
6d8c4e3b | 1634 | |
6d8c4e3b | 1635 | segs = current->mm->map_count; |
1fcccbac | 1636 | segs += elf_core_extra_phdrs(); |
6d8c4e3b | 1637 | |
8d9032bb DH |
1638 | /* for notes section */ |
1639 | segs++; | |
1640 | ||
1641 | /* If segs > PN_XNUM(0xffff), then e_phnum overflows. To avoid | |
1642 | * this, kernel supports extended numbering. Have a look at | |
1643 | * include/linux/elf.h for further information. */ | |
1644 | e_phnum = segs > PN_XNUM ? PN_XNUM : segs; | |
1645 | ||
6d8c4e3b | 1646 | /* Set up header */ |
8d9032bb | 1647 | fill_elf_fdpic_header(elf, e_phnum); |
6d8c4e3b DH |
1648 | |
1649 | has_dumped = 1; | |
6d8c4e3b DH |
1650 | /* |
1651 | * Set up the notes in similar form to SVR4 core dumps made | |
1652 | * with info from their /proc. | |
1653 | */ | |
1654 | ||
1655 | fill_note(notes + 0, "CORE", NT_PRSTATUS, sizeof(*prstatus), prstatus); | |
1656 | fill_psinfo(psinfo, current->group_leader, current->mm); | |
1657 | fill_note(notes + 1, "CORE", NT_PRPSINFO, sizeof(*psinfo), psinfo); | |
1658 | ||
1659 | numnote = 2; | |
1660 | ||
1661 | auxv = (elf_addr_t *) current->mm->saved_auxv; | |
1662 | ||
1663 | i = 0; | |
1664 | do | |
1665 | i += 2; | |
1666 | while (auxv[i - 2] != AT_NULL); | |
1667 | fill_note(¬es[numnote++], "CORE", NT_AUXV, | |
1668 | i * sizeof(elf_addr_t), auxv); | |
1669 | ||
1670 | /* Try to dump the FPU. */ | |
1671 | if ((prstatus->pr_fpvalid = | |
f6151dfe | 1672 | elf_core_copy_task_fpregs(current, cprm->regs, fpu))) |
6d8c4e3b DH |
1673 | fill_note(notes + numnote++, |
1674 | "CORE", NT_PRFPREG, sizeof(*fpu), fpu); | |
1675 | #ifdef ELF_CORE_COPY_XFPREGS | |
1676 | if (elf_core_copy_task_xfpregs(current, xfpu)) | |
1677 | fill_note(notes + numnote++, | |
5b20cd80 | 1678 | "LINUX", ELF_CORE_XFPREG_TYPE, sizeof(*xfpu), xfpu); |
6d8c4e3b DH |
1679 | #endif |
1680 | ||
1681 | fs = get_fs(); | |
1682 | set_fs(KERNEL_DS); | |
1683 | ||
6d8c4e3b | 1684 | offset += sizeof(*elf); /* Elf header */ |
8d9032bb | 1685 | offset += segs * sizeof(struct elf_phdr); /* Program headers */ |
6d8c4e3b DH |
1686 | |
1687 | /* Write notes phdr entry */ | |
1688 | { | |
6d8c4e3b DH |
1689 | int sz = 0; |
1690 | ||
1691 | for (i = 0; i < numnote; i++) | |
1692 | sz += notesize(notes + i); | |
1693 | ||
1694 | sz += thread_status_size; | |
1695 | ||
93eb211e DH |
1696 | phdr4note = kmalloc(sizeof(*phdr4note), GFP_KERNEL); |
1697 | if (!phdr4note) | |
088e7af7 | 1698 | goto end_coredump; |
93eb211e DH |
1699 | |
1700 | fill_elf_note_phdr(phdr4note, sz, offset); | |
1701 | offset += sz; | |
6d8c4e3b DH |
1702 | } |
1703 | ||
1704 | /* Page-align dumped data */ | |
1705 | dataoff = offset = roundup(offset, ELF_EXEC_PAGESIZE); | |
1706 | ||
30736a4d | 1707 | offset += elf_core_vma_data_size(cprm->mm_flags); |
8d9032bb DH |
1708 | offset += elf_core_extra_data_size(); |
1709 | e_shoff = offset; | |
1710 | ||
1711 | if (e_phnum == PN_XNUM) { | |
1712 | shdr4extnum = kmalloc(sizeof(*shdr4extnum), GFP_KERNEL); | |
1713 | if (!shdr4extnum) | |
1714 | goto end_coredump; | |
1715 | fill_extnum_info(elf, shdr4extnum, e_shoff, segs); | |
1716 | } | |
1717 | ||
1718 | offset = dataoff; | |
1719 | ||
e6c1baa9 | 1720 | if (!dump_emit(cprm, elf, sizeof(*elf))) |
93eb211e DH |
1721 | goto end_coredump; |
1722 | ||
e6c1baa9 | 1723 | if (!dump_emit(cprm, phdr4note, sizeof(*phdr4note))) |
93eb211e DH |
1724 | goto end_coredump; |
1725 | ||
6d8c4e3b | 1726 | /* write program headers for segments dump */ |
8feae131 | 1727 | for (vma = current->mm->mmap; vma; vma = vma->vm_next) { |
6d8c4e3b DH |
1728 | struct elf_phdr phdr; |
1729 | size_t sz; | |
1730 | ||
6d8c4e3b DH |
1731 | sz = vma->vm_end - vma->vm_start; |
1732 | ||
1733 | phdr.p_type = PT_LOAD; | |
1734 | phdr.p_offset = offset; | |
1735 | phdr.p_vaddr = vma->vm_start; | |
1736 | phdr.p_paddr = 0; | |
30736a4d | 1737 | phdr.p_filesz = maydump(vma, cprm->mm_flags) ? sz : 0; |
6d8c4e3b DH |
1738 | phdr.p_memsz = sz; |
1739 | offset += phdr.p_filesz; | |
1740 | phdr.p_flags = vma->vm_flags & VM_READ ? PF_R : 0; | |
1741 | if (vma->vm_flags & VM_WRITE) | |
1742 | phdr.p_flags |= PF_W; | |
1743 | if (vma->vm_flags & VM_EXEC) | |
1744 | phdr.p_flags |= PF_X; | |
1745 | phdr.p_align = ELF_EXEC_PAGESIZE; | |
1746 | ||
e6c1baa9 | 1747 | if (!dump_emit(cprm, &phdr, sizeof(phdr))) |
088e7af7 | 1748 | goto end_coredump; |
6d8c4e3b DH |
1749 | } |
1750 | ||
506f21c5 | 1751 | if (!elf_core_write_extra_phdrs(cprm, offset)) |
1fcccbac | 1752 | goto end_coredump; |
6d8c4e3b DH |
1753 | |
1754 | /* write out the notes section */ | |
1755 | for (i = 0; i < numnote; i++) | |
e6c1baa9 | 1756 | if (!writenote(notes + i, cprm)) |
6d8c4e3b DH |
1757 | goto end_coredump; |
1758 | ||
1759 | /* write out the thread status notes section */ | |
1760 | list_for_each(t, &thread_list) { | |
1761 | struct elf_thread_status *tmp = | |
1762 | list_entry(t, struct elf_thread_status, list); | |
1763 | ||
1764 | for (i = 0; i < tmp->num_notes; i++) | |
e6c1baa9 | 1765 | if (!writenote(&tmp->notes[i], cprm)) |
6d8c4e3b DH |
1766 | goto end_coredump; |
1767 | } | |
1768 | ||
1607f09c | 1769 | if (!dump_skip(cprm, dataoff - cprm->pos)) |
f3e8fccd | 1770 | goto end_coredump; |
6d8c4e3b | 1771 | |
e6c1baa9 | 1772 | if (!elf_fdpic_dump_segments(cprm)) |
6d8c4e3b DH |
1773 | goto end_coredump; |
1774 | ||
aa3e7eaf | 1775 | if (!elf_core_write_extra_data(cprm)) |
1fcccbac | 1776 | goto end_coredump; |
6d8c4e3b | 1777 | |
8d9032bb | 1778 | if (e_phnum == PN_XNUM) { |
e6c1baa9 | 1779 | if (!dump_emit(cprm, shdr4extnum, sizeof(*shdr4extnum))) |
8d9032bb DH |
1780 | goto end_coredump; |
1781 | } | |
1782 | ||
2f48912d | 1783 | if (cprm->file->f_pos != offset) { |
6d8c4e3b DH |
1784 | /* Sanity check */ |
1785 | printk(KERN_WARNING | |
1786 | "elf_core_dump: file->f_pos (%lld) != offset (%lld)\n", | |
2f48912d | 1787 | cprm->file->f_pos, offset); |
6d8c4e3b DH |
1788 | } |
1789 | ||
1790 | end_coredump: | |
1791 | set_fs(fs); | |
1792 | ||
1793 | cleanup: | |
1794 | while (!list_empty(&thread_list)) { | |
1795 | struct list_head *tmp = thread_list.next; | |
1796 | list_del(tmp); | |
1797 | kfree(list_entry(tmp, struct elf_thread_status, list)); | |
1798 | } | |
93eb211e | 1799 | kfree(phdr4note); |
6d8c4e3b DH |
1800 | kfree(elf); |
1801 | kfree(prstatus); | |
1802 | kfree(psinfo); | |
1803 | kfree(notes); | |
1804 | kfree(fpu); | |
bcb65a79 | 1805 | kfree(shdr4extnum); |
6d8c4e3b DH |
1806 | #ifdef ELF_CORE_COPY_XFPREGS |
1807 | kfree(xfpu); | |
1808 | #endif | |
1809 | return has_dumped; | |
1810 | #undef NUM_NOTES | |
1811 | } | |
1812 | ||
698ba7b5 | 1813 | #endif /* CONFIG_ELF_CORE */ |