| 1 | |
| 2 | |
| 3 | *
|
| 4 | * Copyright (C) 2003, 2004, 2006 Red Hat, Inc. All Rights Reserved.
|
| 5 | * Written by David Howells ([email protected])
|
| 6 | * Derived from binfmt_elf.c
|
| 7 |
|
| 8 |
|
| 9 | #include <linux/module.h>
|
| 10 |
|
| 11 | #include <linux/fs.h>
|
| 12 | #include <linux/stat.h>
|
| 13 | #include <linux/sched.h>
|
| 14 | #include <linux/sched/coredump.h>
|
| 15 | #include <linux/sched/task_stack.h>
|
| 16 | #include <linux/sched/cputime.h>
|
| 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>
|
| 26 | #include <linux/pagemap.h>
|
| 27 | #include <linux/security.h>
|
| 28 | #include <linux/highmem.h>
|
| 29 | #include <linux/highuid.h>
|
| 30 | #include <linux/personality.h>
|
| 31 | #include <linux/ptrace.h>
|
| 32 | #include <linux/init.h>
|
| 33 | #include <linux/elf.h>
|
| 34 | #include <linux/elf-fdpic.h>
|
| 35 | #include <linux/elfcore.h>
|
| 36 | #include <linux/coredump.h>
|
| 37 | #include <linux/dax.h>
|
| 38 | #include <linux/regset.h>
|
| 39 |
|
| 40 | #include <linux/uaccess.h>
|
| 41 | #include <asm/param.h>
|
| 42 |
|
| 43 | typedef char *elf_caddr_t;
|
| 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 |
|
| 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 |
|
| 57 | MODULE_LICENSE("GPL");
|
| 58 |
|
| 59 | static int load_elf_fdpic_binary(struct linux_binprm *);
|
| 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 *);
|
| 63 |
|
| 64 | static int create_elf_fdpic_tables(struct linux_binprm *, struct mm_struct *,
|
| 65 | struct elf_fdpic_params *,
|
| 66 | struct elf_fdpic_params *);
|
| 67 |
|
| 68 | #ifndef CONFIG_MMU
|
| 69 | static int elf_fdpic_map_file_constdisp_on_uclinux(struct elf_fdpic_params *,
|
| 70 | struct file *,
|
| 71 | struct mm_struct *);
|
| 72 | #endif
|
| 73 |
|
| 74 | static int elf_fdpic_map_file_by_direct_mmap(struct elf_fdpic_params *,
|
| 75 | struct file *, struct mm_struct *);
|
| 76 |
|
| 77 | #ifdef CONFIG_ELF_CORE
|
| 78 | static bool elf_fdpic_core_dump(struct coredump_params *cprm);
|
| 79 | #endif
|
| 80 |
|
| 81 | static struct linux_binfmt elf_fdpic_format = {
|
| 82 | .module = THIS_MODULE,
|
| 83 | .load_binary = load_elf_fdpic_binary,
|
| 84 | #ifdef CONFIG_ELF_CORE
|
| 85 | .core_dump = elf_fdpic_core_dump,
|
| 86 | .min_coredump = ELF_EXEC_PAGESIZE,
|
| 87 | #endif
|
| 88 | };
|
| 89 |
|
| 90 | static int __init init_elf_fdpic_binfmt(void)
|
| 91 | {
|
| 92 | register_binfmt(&elf_fdpic_format);
|
| 93 | return 0;
|
| 94 | }
|
| 95 |
|
| 96 | static void __exit exit_elf_fdpic_binfmt(void)
|
| 97 | {
|
| 98 | unregister_binfmt(&elf_fdpic_format);
|
| 99 | }
|
| 100 |
|
| 101 | core_initcall(init_elf_fdpic_binfmt);
|
| 102 | module_exit(exit_elf_fdpic_binfmt);
|
| 103 |
|
| 104 | static int is_elf(struct elfhdr *hdr, struct file *file)
|
| 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;
|
| 110 | if (!elf_check_arch(hdr))
|
| 111 | return 0;
|
| 112 | if (!can_mmap_file(file))
|
| 113 | return 0;
|
| 114 | return 1;
|
| 115 | }
|
| 116 |
|
| 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 |
|
| 134 |
|
| 135 | |
| 136 | * read the program headers table into memory
|
| 137 |
|
| 138 | static int elf_fdpic_fetch_phdrs(struct elf_fdpic_params *params,
|
| 139 | struct file *file)
|
| 140 | {
|
| 141 | struct elf_phdr *phdr;
|
| 142 | unsigned long size;
|
| 143 | int retval, loop;
|
| 144 | loff_t pos = params->hdr.e_phoff;
|
| 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 |
|
| 156 | retval = kernel_read(file, params->phdrs, size, &pos);
|
| 157 | if (unlikely(retval != size))
|
| 158 | return retval < 0 ? retval : -ENOEXEC;
|
| 159 |
|
| 160 |
|
| 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;
|
| 176 | }
|
| 177 |
|
| 178 |
|
| 179 | |
| 180 | * load an fdpic binary into various bits of memory
|
| 181 |
|
| 182 | static int load_elf_fdpic_binary(struct linux_binprm *bprm)
|
| 183 | {
|
| 184 | struct elf_fdpic_params exec_params, interp_params;
|
| 185 | struct pt_regs *regs = current_pt_regs();
|
| 186 | struct elf_phdr *phdr;
|
| 187 | unsigned long stack_size, entryaddr;
|
| 188 | #ifdef ELF_FDPIC_PLAT_INIT
|
| 189 | unsigned long dynaddr;
|
| 190 | #endif
|
| 191 | #ifndef CONFIG_MMU
|
| 192 | unsigned long stack_prot;
|
| 193 | #endif
|
| 194 | struct file *interpreter = NULL;
|
| 195 | char *interpreter_name = NULL;
|
| 196 | int executable_stack;
|
| 197 | int retval, i;
|
| 198 | loff_t pos;
|
| 199 |
|
| 200 | kdebug("____ LOAD %d ____", current->pid);
|
| 201 |
|
| 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 |
|
| 209 | retval = -ENOEXEC;
|
| 210 | if (!is_elf(&exec_params.hdr, bprm->file))
|
| 211 | goto error;
|
| 212 | if (!elf_check_fdpic(&exec_params.hdr)) {
|
| 213 | #ifdef CONFIG_MMU
|
| 214 |
|
| 215 | goto error;
|
| 216 | #else
|
| 217 |
|
| 218 | if (exec_params.hdr.e_type != ET_DYN)
|
| 219 | goto error;
|
| 220 | #endif
|
| 221 | }
|
| 222 |
|
| 223 |
|
| 224 | retval = elf_fdpic_fetch_phdrs(&exec_params, bprm->file);
|
| 225 | if (retval < 0)
|
| 226 | goto error;
|
| 227 |
|
| 228 |
|
| 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 |
|
| 235 | if (interpreter_name)
|
| 236 | continue;
|
| 237 |
|
| 238 | retval = -ENOMEM;
|
| 239 | if (phdr->p_filesz > PATH_MAX)
|
| 240 | goto error;
|
| 241 | retval = -ENOENT;
|
| 242 | if (phdr->p_filesz < 2)
|
| 243 | goto error;
|
| 244 |
|
| 245 |
|
| 246 | interpreter_name = kmalloc(phdr->p_filesz, GFP_KERNEL);
|
| 247 | if (!interpreter_name)
|
| 248 | goto error;
|
| 249 |
|
| 250 | pos = phdr->p_offset;
|
| 251 | retval = kernel_read(bprm->file, interpreter_name,
|
| 252 | phdr->p_filesz, &pos);
|
| 253 | if (unlikely(retval != phdr->p_filesz)) {
|
| 254 | if (retval >= 0)
|
| 255 | retval = -ENOEXEC;
|
| 256 | goto error;
|
| 257 | }
|
| 258 |
|
| 259 | retval = -ENOENT;
|
| 260 | if (interpreter_name[phdr->p_filesz - 1] != '\0')
|
| 261 | goto error;
|
| 262 |
|
| 263 | kdebug("Using ELF interpreter %s", interpreter_name);
|
| 264 |
|
| 265 |
|
| 266 | interpreter = bprm_open_interpreter(bprm,
|
| 267 | interpreter_name);
|
| 268 | retval = PTR_ERR(interpreter);
|
| 269 | if (IS_ERR(interpreter)) {
|
| 270 | interpreter = NULL;
|
| 271 | goto error;
|
| 272 | }
|
| 273 |
|
| 274 | |
| 275 | * If the binary is not readable then enforce
|
| 276 | * mm->dumpable = 0 regardless of the interpreter's
|
| 277 | * permissions.
|
| 278 |
|
| 279 | would_dump(bprm, interpreter);
|
| 280 |
|
| 281 | pos = 0;
|
| 282 | retval = kernel_read(interpreter, bprm->buf,
|
| 283 | BINPRM_BUF_SIZE, &pos);
|
| 284 | if (unlikely(retval != BINPRM_BUF_SIZE)) {
|
| 285 | if (retval >= 0)
|
| 286 | retval = -ENOEXEC;
|
| 287 | goto error;
|
| 288 | }
|
| 289 |
|
| 290 | interp_params.hdr = *((struct elfhdr *) bprm->buf);
|
| 291 | break;
|
| 292 |
|
| 293 | case PT_LOAD:
|
| 294 | #ifdef CONFIG_MMU
|
| 295 | if (exec_params.load_addr == 0)
|
| 296 | exec_params.load_addr = phdr->p_vaddr;
|
| 297 | #endif
|
| 298 | break;
|
| 299 | }
|
| 300 |
|
| 301 | }
|
| 302 |
|
| 303 |
|
| 304 | bprm_drop_loader(bprm);
|
| 305 |
|
| 306 | if (is_constdisp(&exec_params.hdr))
|
| 307 | exec_params.flags |= ELF_FDPIC_FLAG_CONSTDISP;
|
| 308 |
|
| 309 |
|
| 310 | if (interpreter_name) {
|
| 311 | retval = -ELIBBAD;
|
| 312 | if (!is_elf(&interp_params.hdr, interpreter))
|
| 313 | goto error;
|
| 314 |
|
| 315 | interp_params.flags = ELF_FDPIC_FLAG_PRESENT;
|
| 316 |
|
| 317 |
|
| 318 | retval = elf_fdpic_fetch_phdrs(&interp_params, interpreter);
|
| 319 | if (retval < 0)
|
| 320 | goto error;
|
| 321 | }
|
| 322 |
|
| 323 | stack_size = exec_params.stack_size;
|
| 324 | if (exec_params.flags & ELF_FDPIC_FLAG_EXEC_STACK)
|
| 325 | executable_stack = EXSTACK_ENABLE_X;
|
| 326 | else if (exec_params.flags & ELF_FDPIC_FLAG_NOEXEC_STACK)
|
| 327 | executable_stack = EXSTACK_DISABLE_X;
|
| 328 | else
|
| 329 | executable_stack = EXSTACK_DEFAULT;
|
| 330 |
|
| 331 | if (stack_size == 0 && interp_params.flags & ELF_FDPIC_FLAG_PRESENT) {
|
| 332 | stack_size = interp_params.stack_size;
|
| 333 | if (interp_params.flags & ELF_FDPIC_FLAG_EXEC_STACK)
|
| 334 | executable_stack = EXSTACK_ENABLE_X;
|
| 335 | else if (interp_params.flags & ELF_FDPIC_FLAG_NOEXEC_STACK)
|
| 336 | executable_stack = EXSTACK_DISABLE_X;
|
| 337 | else
|
| 338 | executable_stack = EXSTACK_DEFAULT;
|
| 339 | }
|
| 340 |
|
| 341 | retval = -ENOEXEC;
|
| 342 | if (stack_size == 0)
|
| 343 | stack_size = 131072UL;
|
| 344 |
|
| 345 | if (is_constdisp(&interp_params.hdr))
|
| 346 | interp_params.flags |= ELF_FDPIC_FLAG_CONSTDISP;
|
| 347 |
|
| 348 |
|
| 349 | retval = begin_new_exec(bprm);
|
| 350 | if (retval)
|
| 351 | goto error;
|
| 352 |
|
| 353 | |
| 354 | * defunct, deceased, etc.
|
| 355 |
|
| 356 | SET_PERSONALITY(exec_params.hdr);
|
| 357 | if (elf_check_fdpic(&exec_params.hdr))
|
| 358 | current->personality |= PER_LINUX_FDPIC;
|
| 359 | if (elf_read_implies_exec(&exec_params.hdr, executable_stack))
|
| 360 | current->personality |= READ_IMPLIES_EXEC;
|
| 361 |
|
| 362 | setup_new_exec(bprm);
|
| 363 |
|
| 364 | set_binfmt(&elf_fdpic_format);
|
| 365 |
|
| 366 | current->mm->start_code = 0;
|
| 367 | current->mm->end_code = 0;
|
| 368 | current->mm->start_stack = 0;
|
| 369 | current->mm->start_data = 0;
|
| 370 | current->mm->end_data = 0;
|
| 371 | current->mm->context.exec_fdpic_loadmap = 0;
|
| 372 | current->mm->context.interp_fdpic_loadmap = 0;
|
| 373 |
|
| 374 | #ifdef CONFIG_MMU
|
| 375 | elf_fdpic_arch_lay_out_mm(&exec_params,
|
| 376 | &interp_params,
|
| 377 | ¤t->mm->start_stack,
|
| 378 | ¤t->mm->start_brk);
|
| 379 |
|
| 380 | retval = setup_arg_pages(bprm, current->mm->start_stack,
|
| 381 | executable_stack);
|
| 382 | if (retval < 0)
|
| 383 | goto error;
|
| 384 | #ifdef ARCH_HAS_SETUP_ADDITIONAL_PAGES
|
| 385 | retval = arch_setup_additional_pages(bprm, !!interpreter_name);
|
| 386 | if (retval < 0)
|
| 387 | goto error;
|
| 388 | #endif
|
| 389 | #endif
|
| 390 |
|
| 391 |
|
| 392 | retval = elf_fdpic_map_file(&exec_params, bprm->file, current->mm,
|
| 393 | "executable");
|
| 394 | if (retval < 0)
|
| 395 | goto error;
|
| 396 |
|
| 397 | if (interpreter_name) {
|
| 398 | retval = elf_fdpic_map_file(&interp_params, interpreter,
|
| 399 | current->mm, "interpreter");
|
| 400 | if (retval < 0) {
|
| 401 | printk(KERN_ERR "Unable to load interpreter\n");
|
| 402 | goto error;
|
| 403 | }
|
| 404 |
|
| 405 | exe_file_allow_write_access(interpreter);
|
| 406 | fput(interpreter);
|
| 407 | interpreter = NULL;
|
| 408 | }
|
| 409 |
|
| 410 | #ifdef CONFIG_MMU
|
| 411 | if (!current->mm->start_brk)
|
| 412 | current->mm->start_brk = current->mm->end_data;
|
| 413 |
|
| 414 | current->mm->brk = current->mm->start_brk =
|
| 415 | PAGE_ALIGN(current->mm->start_brk);
|
| 416 |
|
| 417 | #else
|
| 418 |
|
| 419 | stack_size = (stack_size + PAGE_SIZE - 1) & PAGE_MASK;
|
| 420 | if (stack_size < PAGE_SIZE * 2)
|
| 421 | stack_size = PAGE_SIZE * 2;
|
| 422 |
|
| 423 | stack_prot = PROT_READ | PROT_WRITE;
|
| 424 | if (executable_stack == EXSTACK_ENABLE_X ||
|
| 425 | (executable_stack == EXSTACK_DEFAULT && VM_STACK_FLAGS & VM_EXEC))
|
| 426 | stack_prot |= PROT_EXEC;
|
| 427 |
|
| 428 | current->mm->start_brk = vm_mmap(NULL, 0, stack_size, stack_prot,
|
| 429 | MAP_PRIVATE | MAP_ANONYMOUS |
|
| 430 | MAP_UNINITIALIZED | MAP_GROWSDOWN,
|
| 431 | 0);
|
| 432 |
|
| 433 | if (IS_ERR_VALUE(current->mm->start_brk)) {
|
| 434 | retval = current->mm->start_brk;
|
| 435 | current->mm->start_brk = 0;
|
| 436 | goto error;
|
| 437 | }
|
| 438 |
|
| 439 | current->mm->brk = current->mm->start_brk;
|
| 440 | current->mm->context.end_brk = current->mm->start_brk;
|
| 441 | current->mm->start_stack = current->mm->start_brk + stack_size;
|
| 442 | #endif
|
| 443 |
|
| 444 | retval = create_elf_fdpic_tables(bprm, current->mm, &exec_params,
|
| 445 | &interp_params);
|
| 446 | if (retval < 0)
|
| 447 | goto error;
|
| 448 |
|
| 449 | kdebug("- start_code %lx", current->mm->start_code);
|
| 450 | kdebug("- end_code %lx", current->mm->end_code);
|
| 451 | kdebug("- start_data %lx", current->mm->start_data);
|
| 452 | kdebug("- end_data %lx", current->mm->end_data);
|
| 453 | kdebug("- start_brk %lx", current->mm->start_brk);
|
| 454 | kdebug("- brk %lx", current->mm->brk);
|
| 455 | kdebug("- start_stack %lx", current->mm->start_stack);
|
| 456 |
|
| 457 | #ifdef ELF_FDPIC_PLAT_INIT
|
| 458 | |
| 459 | * The ABI may specify that certain registers be set up in special
|
| 460 | * ways (on i386 %edx is the address of a DT_FINI function, for
|
| 461 | * example. This macro performs whatever initialization to
|
| 462 | * the regs structure is required.
|
| 463 |
|
| 464 | dynaddr = interp_params.dynamic_addr ?: exec_params.dynamic_addr;
|
| 465 | ELF_FDPIC_PLAT_INIT(regs, exec_params.map_addr, interp_params.map_addr,
|
| 466 | dynaddr);
|
| 467 | #endif
|
| 468 |
|
| 469 | finalize_exec(bprm);
|
| 470 |
|
| 471 | entryaddr = interp_params.entry_addr ?: exec_params.entry_addr;
|
| 472 | start_thread(regs, entryaddr, current->mm->start_stack);
|
| 473 |
|
| 474 | retval = 0;
|
| 475 |
|
| 476 | error:
|
| 477 | if (interpreter) {
|
| 478 | exe_file_allow_write_access(interpreter);
|
| 479 | fput(interpreter);
|
| 480 | }
|
| 481 | kfree(interpreter_name);
|
| 482 | kfree(exec_params.phdrs);
|
| 483 | kfree(exec_params.loadmap);
|
| 484 | kfree(interp_params.phdrs);
|
| 485 | kfree(interp_params.loadmap);
|
| 486 | return retval;
|
| 487 | }
|
| 488 |
|
| 489 |
|
| 490 |
|
| 491 | #ifndef ELF_BASE_PLATFORM
|
| 492 | |
| 493 | * AT_BASE_PLATFORM indicates the "real" hardware/microarchitecture.
|
| 494 | * If the arch defines ELF_BASE_PLATFORM (in asm/elf.h), the value
|
| 495 | * will be copied to the user stack in the same manner as AT_PLATFORM.
|
| 496 |
|
| 497 | #define ELF_BASE_PLATFORM NULL
|
| 498 | #endif
|
| 499 |
|
| 500 | |
| 501 | * present useful information to the program by shovelling it onto the new
|
| 502 | * process's stack
|
| 503 |
|
| 504 | static int create_elf_fdpic_tables(struct linux_binprm *bprm,
|
| 505 | struct mm_struct *mm,
|
| 506 | struct elf_fdpic_params *exec_params,
|
| 507 | struct elf_fdpic_params *interp_params)
|
| 508 | {
|
| 509 | const struct cred *cred = current_cred();
|
| 510 | unsigned long sp, csp, nitems;
|
| 511 | elf_caddr_t __user *argv, *envp;
|
| 512 | size_t platform_len = 0, len;
|
| 513 | char *k_platform, *k_base_platform;
|
| 514 | char __user *u_platform, *u_base_platform, *p;
|
| 515 | int loop;
|
| 516 | int ei_index;
|
| 517 | elf_addr_t *elf_info;
|
| 518 |
|
| 519 | #ifdef CONFIG_MMU
|
| 520 | |
| 521 | * by the processes running on the same package. One thing we can do is
|
| 522 | * to shuffle the initial stack for them, so we give the architecture
|
| 523 | * an opportunity to do so here.
|
| 524 |
|
| 525 | sp = arch_align_stack(bprm->p);
|
| 526 | #else
|
| 527 | sp = mm->start_stack;
|
| 528 |
|
| 529 |
|
| 530 | if (transfer_args_to_stack(bprm, &sp) < 0)
|
| 531 | return -EFAULT;
|
| 532 | sp &= ~15;
|
| 533 | #endif
|
| 534 |
|
| 535 | |
| 536 | * If this architecture has a platform capability string, copy it
|
| 537 | * to userspace. In some cases (Sparc), this info is impossible
|
| 538 | * for userspace to get any other way, in others (i386) it is
|
| 539 | * merely difficult.
|
| 540 |
|
| 541 | k_platform = ELF_PLATFORM;
|
| 542 | u_platform = NULL;
|
| 543 |
|
| 544 | if (k_platform) {
|
| 545 | platform_len = strlen(k_platform) + 1;
|
| 546 | sp -= platform_len;
|
| 547 | u_platform = (char __user *) sp;
|
| 548 | if (copy_to_user(u_platform, k_platform, platform_len) != 0)
|
| 549 | return -EFAULT;
|
| 550 | }
|
| 551 |
|
| 552 | |
| 553 | * If this architecture has a "base" platform capability
|
| 554 | * string, copy it to userspace.
|
| 555 |
|
| 556 | k_base_platform = ELF_BASE_PLATFORM;
|
| 557 | u_base_platform = NULL;
|
| 558 |
|
| 559 | if (k_base_platform) {
|
| 560 | platform_len = strlen(k_base_platform) + 1;
|
| 561 | sp -= platform_len;
|
| 562 | u_base_platform = (char __user *) sp;
|
| 563 | if (copy_to_user(u_base_platform, k_base_platform, platform_len) != 0)
|
| 564 | return -EFAULT;
|
| 565 | }
|
| 566 |
|
| 567 | sp &= ~7UL;
|
| 568 |
|
| 569 |
|
| 570 | len = sizeof(struct elf_fdpic_loadmap);
|
| 571 | len += sizeof(struct elf_fdpic_loadseg) * exec_params->loadmap->nsegs;
|
| 572 | sp = (sp - len) & ~7UL;
|
| 573 | exec_params->map_addr = sp;
|
| 574 |
|
| 575 | if (copy_to_user((void __user *) sp, exec_params->loadmap, len) != 0)
|
| 576 | return -EFAULT;
|
| 577 |
|
| 578 | current->mm->context.exec_fdpic_loadmap = (unsigned long) sp;
|
| 579 |
|
| 580 | if (interp_params->loadmap) {
|
| 581 | len = sizeof(struct elf_fdpic_loadmap);
|
| 582 | len += sizeof(struct elf_fdpic_loadseg) *
|
| 583 | interp_params->loadmap->nsegs;
|
| 584 | sp = (sp - len) & ~7UL;
|
| 585 | interp_params->map_addr = sp;
|
| 586 |
|
| 587 | if (copy_to_user((void __user *) sp, interp_params->loadmap,
|
| 588 | len) != 0)
|
| 589 | return -EFAULT;
|
| 590 |
|
| 591 | current->mm->context.interp_fdpic_loadmap = (unsigned long) sp;
|
| 592 | }
|
| 593 |
|
| 594 |
|
| 595 | #define DLINFO_ITEMS 15
|
| 596 |
|
| 597 | nitems = 1 + DLINFO_ITEMS + (k_platform ? 1 : 0) +
|
| 598 | (k_base_platform ? 1 : 0) + AT_VECTOR_SIZE_ARCH;
|
| 599 |
|
| 600 | if (bprm->have_execfd)
|
| 601 | nitems++;
|
| 602 | #ifdef ELF_HWCAP2
|
| 603 | nitems++;
|
| 604 | #endif
|
| 605 | #ifdef ELF_HWCAP3
|
| 606 | nitems++;
|
| 607 | #endif
|
| 608 | #ifdef ELF_HWCAP4
|
| 609 | nitems++;
|
| 610 | #endif
|
| 611 |
|
| 612 | csp = sp;
|
| 613 | sp -= nitems * 2 * sizeof(unsigned long);
|
| 614 | sp -= (bprm->envc + 1) * sizeof(char *);
|
| 615 | sp -= (bprm->argc + 1) * sizeof(char *);
|
| 616 | sp -= 1 * sizeof(unsigned long);
|
| 617 |
|
| 618 | csp -= sp & 15UL;
|
| 619 | sp -= sp & 15UL;
|
| 620 |
|
| 621 |
|
| 622 | elf_info = (elf_addr_t *)mm->saved_auxv;
|
| 623 |
|
| 624 | #define NEW_AUX_ENT(id, val) \
|
| 625 | do { \
|
| 626 | *elf_info++ = id; \
|
| 627 | *elf_info++ = val; \
|
| 628 | } while (0)
|
| 629 |
|
| 630 | #ifdef ARCH_DLINFO
|
| 631 | |
| 632 | * ARCH_DLINFO must come first so PPC can do its special alignment of
|
| 633 | * AUXV.
|
| 634 | * update AT_VECTOR_SIZE_ARCH if the number of NEW_AUX_ENT() in
|
| 635 | * ARCH_DLINFO changes
|
| 636 |
|
| 637 | ARCH_DLINFO;
|
| 638 | #endif
|
| 639 | NEW_AUX_ENT(AT_HWCAP, ELF_HWCAP);
|
| 640 | #ifdef ELF_HWCAP2
|
| 641 | NEW_AUX_ENT(AT_HWCAP2, ELF_HWCAP2);
|
| 642 | #endif
|
| 643 | #ifdef ELF_HWCAP3
|
| 644 | NEW_AUX_ENT(AT_HWCAP3, ELF_HWCAP3);
|
| 645 | #endif
|
| 646 | #ifdef ELF_HWCAP4
|
| 647 | NEW_AUX_ENT(AT_HWCAP4, ELF_HWCAP4);
|
| 648 | #endif
|
| 649 | NEW_AUX_ENT(AT_PAGESZ, PAGE_SIZE);
|
| 650 | NEW_AUX_ENT(AT_CLKTCK, CLOCKS_PER_SEC);
|
| 651 | NEW_AUX_ENT(AT_PHDR, exec_params->ph_addr);
|
| 652 | NEW_AUX_ENT(AT_PHENT, sizeof(struct elf_phdr));
|
| 653 | NEW_AUX_ENT(AT_PHNUM, exec_params->hdr.e_phnum);
|
| 654 | NEW_AUX_ENT(AT_BASE, interp_params->elfhdr_addr);
|
| 655 | NEW_AUX_ENT(AT_FLAGS, bprm_at_flags(bprm));
|
| 656 | NEW_AUX_ENT(AT_ENTRY, exec_params->entry_addr);
|
| 657 | NEW_AUX_ENT(AT_UID, (elf_addr_t) from_kuid_munged(cred->user_ns, cred->uid));
|
| 658 | NEW_AUX_ENT(AT_EUID, (elf_addr_t) from_kuid_munged(cred->user_ns, cred->euid));
|
| 659 | NEW_AUX_ENT(AT_GID, (elf_addr_t) from_kgid_munged(cred->user_ns, cred->gid));
|
| 660 | NEW_AUX_ENT(AT_EGID, (elf_addr_t) from_kgid_munged(cred->user_ns, cred->egid));
|
| 661 | NEW_AUX_ENT(AT_SECURE, bprm->secureexec);
|
| 662 | NEW_AUX_ENT(AT_EXECFN, bprm->exec);
|
| 663 | if (k_platform)
|
| 664 | NEW_AUX_ENT(AT_PLATFORM,
|
| 665 | (elf_addr_t)(unsigned long)u_platform);
|
| 666 | if (k_base_platform)
|
| 667 | NEW_AUX_ENT(AT_BASE_PLATFORM,
|
| 668 | (elf_addr_t)(unsigned long)u_base_platform);
|
| 669 | if (bprm->have_execfd)
|
| 670 | NEW_AUX_ENT(AT_EXECFD, bprm->execfd);
|
| 671 | #undef NEW_AUX_ENT
|
| 672 |
|
| 673 | memset(elf_info, 0, (char *)mm->saved_auxv +
|
| 674 | sizeof(mm->saved_auxv) - (char *)elf_info);
|
| 675 |
|
| 676 |
|
| 677 | elf_info += 2;
|
| 678 |
|
| 679 | ei_index = elf_info - (elf_addr_t *)mm->saved_auxv;
|
| 680 | csp -= ei_index * sizeof(elf_addr_t);
|
| 681 |
|
| 682 |
|
| 683 | if (copy_to_user((void __user *)csp, mm->saved_auxv,
|
| 684 | ei_index * sizeof(elf_addr_t)))
|
| 685 | return -EFAULT;
|
| 686 |
|
| 687 |
|
| 688 | csp -= (bprm->envc + 1) * sizeof(elf_caddr_t);
|
| 689 | envp = (elf_caddr_t __user *) csp;
|
| 690 | csp -= (bprm->argc + 1) * sizeof(elf_caddr_t);
|
| 691 | argv = (elf_caddr_t __user *) csp;
|
| 692 |
|
| 693 |
|
| 694 | csp -= sizeof(unsigned long);
|
| 695 | if (put_user(bprm->argc, (unsigned long __user *) csp))
|
| 696 | return -EFAULT;
|
| 697 |
|
| 698 | BUG_ON(csp != sp);
|
| 699 |
|
| 700 |
|
| 701 | #ifdef CONFIG_MMU
|
| 702 | current->mm->arg_start = bprm->p;
|
| 703 | #else
|
| 704 | current->mm->arg_start = current->mm->start_stack -
|
| 705 | (MAX_ARG_PAGES * PAGE_SIZE - bprm->p);
|
| 706 | #endif
|
| 707 |
|
| 708 | p = (char __user *) current->mm->arg_start;
|
| 709 | for (loop = bprm->argc; loop > 0; loop--) {
|
| 710 | if (put_user((elf_caddr_t) p, argv++))
|
| 711 | return -EFAULT;
|
| 712 | len = strnlen_user(p, MAX_ARG_STRLEN);
|
| 713 | if (!len || len > MAX_ARG_STRLEN)
|
| 714 | return -EINVAL;
|
| 715 | p += len;
|
| 716 | }
|
| 717 | if (put_user(NULL, argv))
|
| 718 | return -EFAULT;
|
| 719 | current->mm->arg_end = (unsigned long) p;
|
| 720 |
|
| 721 |
|
| 722 | current->mm->env_start = (unsigned long) p;
|
| 723 | for (loop = bprm->envc; loop > 0; loop--) {
|
| 724 | if (put_user((elf_caddr_t)(unsigned long) p, envp++))
|
| 725 | return -EFAULT;
|
| 726 | len = strnlen_user(p, MAX_ARG_STRLEN);
|
| 727 | if (!len || len > MAX_ARG_STRLEN)
|
| 728 | return -EINVAL;
|
| 729 | p += len;
|
| 730 | }
|
| 731 | if (put_user(NULL, envp))
|
| 732 | return -EFAULT;
|
| 733 | current->mm->env_end = (unsigned long) p;
|
| 734 |
|
| 735 | mm->start_stack = (unsigned long) sp;
|
| 736 | return 0;
|
| 737 | }
|
| 738 |
|
| 739 |
|
| 740 | |
| 741 | * load the appropriate binary image (executable or interpreter) into memory
|
| 742 | * - we assume no MMU is available
|
| 743 | * - if no other PIC bits are set in params->hdr->e_flags
|
| 744 | * - we assume that the LOADable segments in the binary are independently relocatable
|
| 745 | * - we assume R/O executable segments are shareable
|
| 746 | * - else
|
| 747 | * - we assume the loadable parts of the image to require fixed displacement
|
| 748 | * - the image is not shareable
|
| 749 |
|
| 750 | static int elf_fdpic_map_file(struct elf_fdpic_params *params,
|
| 751 | struct file *file,
|
| 752 | struct mm_struct *mm,
|
| 753 | const char *what)
|
| 754 | {
|
| 755 | struct elf_fdpic_loadmap *loadmap;
|
| 756 | #ifdef CONFIG_MMU
|
| 757 | struct elf_fdpic_loadseg *mseg;
|
| 758 | unsigned long load_addr;
|
| 759 | #endif
|
| 760 | struct elf_fdpic_loadseg *seg;
|
| 761 | struct elf_phdr *phdr;
|
| 762 | unsigned nloads, tmp;
|
| 763 | unsigned long stop;
|
| 764 | int loop, ret;
|
| 765 |
|
| 766 |
|
| 767 | nloads = 0;
|
| 768 | for (loop = 0; loop < params->hdr.e_phnum; loop++)
|
| 769 | if (params->phdrs[loop].p_type == PT_LOAD)
|
| 770 | nloads++;
|
| 771 |
|
| 772 | if (nloads == 0)
|
| 773 | return -ELIBBAD;
|
| 774 |
|
| 775 | loadmap = kzalloc_flex(*loadmap, segs, nloads);
|
| 776 | if (!loadmap)
|
| 777 | return -ENOMEM;
|
| 778 |
|
| 779 | params->loadmap = loadmap;
|
| 780 |
|
| 781 | loadmap->version = ELF_FDPIC_LOADMAP_VERSION;
|
| 782 | loadmap->nsegs = nloads;
|
| 783 |
|
| 784 |
|
| 785 | switch (params->flags & ELF_FDPIC_FLAG_ARRANGEMENT) {
|
| 786 | case ELF_FDPIC_FLAG_CONSTDISP:
|
| 787 | case ELF_FDPIC_FLAG_CONTIGUOUS:
|
| 788 | #ifndef CONFIG_MMU
|
| 789 | ret = elf_fdpic_map_file_constdisp_on_uclinux(params, file, mm);
|
| 790 | if (ret < 0)
|
| 791 | return ret;
|
| 792 | break;
|
| 793 | #endif
|
| 794 | default:
|
| 795 | ret = elf_fdpic_map_file_by_direct_mmap(params, file, mm);
|
| 796 | if (ret < 0)
|
| 797 | return ret;
|
| 798 | break;
|
| 799 | }
|
| 800 |
|
| 801 |
|
| 802 | if (params->hdr.e_entry) {
|
| 803 | seg = loadmap->segs;
|
| 804 | for (loop = loadmap->nsegs; loop > 0; loop--, seg++) {
|
| 805 | if (params->hdr.e_entry >= seg->p_vaddr &&
|
| 806 | params->hdr.e_entry < seg->p_vaddr + seg->p_memsz) {
|
| 807 | params->entry_addr =
|
| 808 | (params->hdr.e_entry - seg->p_vaddr) +
|
| 809 | seg->addr;
|
| 810 | break;
|
| 811 | }
|
| 812 | }
|
| 813 | }
|
| 814 |
|
| 815 |
|
| 816 | stop = params->hdr.e_phoff;
|
| 817 | stop += params->hdr.e_phnum * sizeof (struct elf_phdr);
|
| 818 | phdr = params->phdrs;
|
| 819 |
|
| 820 | for (loop = 0; loop < params->hdr.e_phnum; loop++, phdr++) {
|
| 821 | if (phdr->p_type != PT_LOAD)
|
| 822 | continue;
|
| 823 |
|
| 824 | if (phdr->p_offset > params->hdr.e_phoff ||
|
| 825 | phdr->p_offset + phdr->p_filesz < stop)
|
| 826 | continue;
|
| 827 |
|
| 828 | seg = loadmap->segs;
|
| 829 | for (loop = loadmap->nsegs; loop > 0; loop--, seg++) {
|
| 830 | if (phdr->p_vaddr >= seg->p_vaddr &&
|
| 831 | phdr->p_vaddr + phdr->p_filesz <=
|
| 832 | seg->p_vaddr + seg->p_memsz) {
|
| 833 | params->ph_addr =
|
| 834 | (phdr->p_vaddr - seg->p_vaddr) +
|
| 835 | seg->addr +
|
| 836 | params->hdr.e_phoff - phdr->p_offset;
|
| 837 | break;
|
| 838 | }
|
| 839 | }
|
| 840 | break;
|
| 841 | }
|
| 842 |
|
| 843 |
|
| 844 | phdr = params->phdrs;
|
| 845 | for (loop = 0; loop < params->hdr.e_phnum; loop++, phdr++) {
|
| 846 | if (phdr->p_type != PT_DYNAMIC)
|
| 847 | continue;
|
| 848 |
|
| 849 | seg = loadmap->segs;
|
| 850 | for (loop = loadmap->nsegs; loop > 0; loop--, seg++) {
|
| 851 | if (phdr->p_vaddr >= seg->p_vaddr &&
|
| 852 | phdr->p_vaddr + phdr->p_memsz <=
|
| 853 | seg->p_vaddr + seg->p_memsz) {
|
| 854 | Elf_Dyn __user *dyn;
|
| 855 | Elf_Sword d_tag;
|
| 856 |
|
| 857 | params->dynamic_addr =
|
| 858 | (phdr->p_vaddr - seg->p_vaddr) +
|
| 859 | seg->addr;
|
| 860 |
|
| 861 | |
| 862 | * one item, and that the last item is a NULL
|
| 863 | * entry
|
| 864 | if (phdr->p_memsz == 0 ||
|
| 865 | phdr->p_memsz % sizeof(Elf_Dyn) != 0)
|
| 866 | goto dynamic_error;
|
| 867 |
|
| 868 | tmp = phdr->p_memsz / sizeof(Elf_Dyn);
|
| 869 | dyn = (Elf_Dyn __user *)params->dynamic_addr;
|
| 870 | if (get_user(d_tag, &dyn[tmp - 1].d_tag) ||
|
| 871 | d_tag != 0)
|
| 872 | goto dynamic_error;
|
| 873 | break;
|
| 874 | }
|
| 875 | }
|
| 876 | break;
|
| 877 | }
|
| 878 |
|
| 879 | |
| 880 | * - on uClinux the holes between may actually be filled with system
|
| 881 | * stuff or stuff from other processes
|
| 882 |
|
| 883 | #ifdef CONFIG_MMU
|
| 884 | nloads = loadmap->nsegs;
|
| 885 | mseg = loadmap->segs;
|
| 886 | seg = mseg + 1;
|
| 887 | for (loop = 1; loop < nloads; loop++) {
|
| 888 |
|
| 889 | if (seg->p_vaddr - mseg->p_vaddr == seg->addr - mseg->addr) {
|
| 890 | load_addr = PAGE_ALIGN(mseg->addr + mseg->p_memsz);
|
| 891 | if (load_addr == (seg->addr & PAGE_MASK)) {
|
| 892 | mseg->p_memsz +=
|
| 893 | load_addr -
|
| 894 | (mseg->addr + mseg->p_memsz);
|
| 895 | mseg->p_memsz += seg->addr & ~PAGE_MASK;
|
| 896 | mseg->p_memsz += seg->p_memsz;
|
| 897 | loadmap->nsegs--;
|
| 898 | continue;
|
| 899 | }
|
| 900 | }
|
| 901 |
|
| 902 | mseg++;
|
| 903 | if (mseg != seg)
|
| 904 | *mseg = *seg;
|
| 905 | }
|
| 906 | #endif
|
| 907 |
|
| 908 | kdebug("Mapped Object [%s]:", what);
|
| 909 | kdebug("- elfhdr : %lx", params->elfhdr_addr);
|
| 910 | kdebug("- entry : %lx", params->entry_addr);
|
| 911 | kdebug("- PHDR[] : %lx", params->ph_addr);
|
| 912 | kdebug("- DYNAMIC[]: %lx", params->dynamic_addr);
|
| 913 | seg = loadmap->segs;
|
| 914 | for (loop = 0; loop < loadmap->nsegs; loop++, seg++)
|
| 915 | kdebug("- LOAD[%d] : %08llx-%08llx [va=%llx ms=%llx]",
|
| 916 | loop,
|
| 917 | (unsigned long long) seg->addr,
|
| 918 | (unsigned long long) seg->addr + seg->p_memsz - 1,
|
| 919 | (unsigned long long) seg->p_vaddr,
|
| 920 | (unsigned long long) seg->p_memsz);
|
| 921 |
|
| 922 | return 0;
|
| 923 |
|
| 924 | dynamic_error:
|
| 925 | printk("ELF FDPIC %s with invalid DYNAMIC section (inode=%llu)\n",
|
| 926 | what, file_inode(file)->i_ino);
|
| 927 | return -ELIBBAD;
|
| 928 | }
|
| 929 |
|
| 930 |
|
| 931 | |
| 932 | * map a file with constant displacement under uClinux
|
| 933 |
|
| 934 | #ifndef CONFIG_MMU
|
| 935 | static int elf_fdpic_map_file_constdisp_on_uclinux(
|
| 936 | struct elf_fdpic_params *params,
|
| 937 | struct file *file,
|
| 938 | struct mm_struct *mm)
|
| 939 | {
|
| 940 | struct elf_fdpic_loadseg *seg;
|
| 941 | struct elf_phdr *phdr;
|
| 942 | unsigned long load_addr, base = ULONG_MAX, top = 0, maddr = 0;
|
| 943 | int loop, ret;
|
| 944 |
|
| 945 | load_addr = params->load_addr;
|
| 946 | seg = params->loadmap->segs;
|
| 947 |
|
| 948 | |
| 949 | * make
|
| 950 | phdr = params->phdrs;
|
| 951 | for (loop = 0; loop < params->hdr.e_phnum; loop++, phdr++) {
|
| 952 | if (params->phdrs[loop].p_type != PT_LOAD)
|
| 953 | continue;
|
| 954 |
|
| 955 | if (base > phdr->p_vaddr)
|
| 956 | base = phdr->p_vaddr;
|
| 957 | if (top < phdr->p_vaddr + phdr->p_memsz)
|
| 958 | top = phdr->p_vaddr + phdr->p_memsz;
|
| 959 | }
|
| 960 |
|
| 961 |
|
| 962 | maddr = vm_mmap(NULL, load_addr, top - base,
|
| 963 | PROT_READ | PROT_WRITE | PROT_EXEC, MAP_PRIVATE, 0);
|
| 964 | if (IS_ERR_VALUE(maddr))
|
| 965 | return (int) maddr;
|
| 966 |
|
| 967 | if (load_addr != 0)
|
| 968 | load_addr += PAGE_ALIGN(top - base);
|
| 969 |
|
| 970 |
|
| 971 | phdr = params->phdrs;
|
| 972 | for (loop = 0; loop < params->hdr.e_phnum; loop++, phdr++) {
|
| 973 | if (params->phdrs[loop].p_type != PT_LOAD)
|
| 974 | continue;
|
| 975 |
|
| 976 | seg->addr = maddr + (phdr->p_vaddr - base);
|
| 977 | seg->p_vaddr = phdr->p_vaddr;
|
| 978 | seg->p_memsz = phdr->p_memsz;
|
| 979 |
|
| 980 | ret = read_code(file, seg->addr, phdr->p_offset,
|
| 981 | phdr->p_filesz);
|
| 982 | if (ret < 0)
|
| 983 | return ret;
|
| 984 |
|
| 985 |
|
| 986 | if (phdr->p_offset == 0)
|
| 987 | params->elfhdr_addr = seg->addr;
|
| 988 |
|
| 989 |
|
| 990 | if (phdr->p_filesz < phdr->p_memsz) {
|
| 991 | if (clear_user((void *) (seg->addr + phdr->p_filesz),
|
| 992 | phdr->p_memsz - phdr->p_filesz))
|
| 993 | return -EFAULT;
|
| 994 | }
|
| 995 |
|
| 996 | if (mm) {
|
| 997 | if (phdr->p_flags & PF_X) {
|
| 998 | if (!mm->start_code) {
|
| 999 | mm->start_code = seg->addr;
|
| 1000 | mm->end_code = seg->addr +
|
| 1001 | phdr->p_memsz;
|
| 1002 | }
|
| 1003 | } else if (!mm->start_data) {
|
| 1004 | mm->start_data = seg->addr;
|
| 1005 | mm->end_data = seg->addr + phdr->p_memsz;
|
| 1006 | }
|
| 1007 | }
|
| 1008 |
|
| 1009 | seg++;
|
| 1010 | }
|
| 1011 |
|
| 1012 | return 0;
|
| 1013 | }
|
| 1014 | #endif
|
| 1015 |
|
| 1016 |
|
| 1017 | |
| 1018 | * map a binary by direct mmap() of the individual PT_LOAD segments
|
| 1019 |
|
| 1020 | static int elf_fdpic_map_file_by_direct_mmap(struct elf_fdpic_params *params,
|
| 1021 | struct file *file,
|
| 1022 | struct mm_struct *mm)
|
| 1023 | {
|
| 1024 | struct elf_fdpic_loadseg *seg;
|
| 1025 | struct elf_phdr *phdr;
|
| 1026 | unsigned long load_addr, delta_vaddr;
|
| 1027 | int loop, dvset;
|
| 1028 |
|
| 1029 | load_addr = params->load_addr;
|
| 1030 | delta_vaddr = 0;
|
| 1031 | dvset = 0;
|
| 1032 |
|
| 1033 | seg = params->loadmap->segs;
|
| 1034 |
|
| 1035 |
|
| 1036 | phdr = params->phdrs;
|
| 1037 | for (loop = 0; loop < params->hdr.e_phnum; loop++, phdr++) {
|
| 1038 | unsigned long maddr, disp, excess;
|
| 1039 | int prot = 0, flags;
|
| 1040 |
|
| 1041 | if (phdr->p_type != PT_LOAD)
|
| 1042 | continue;
|
| 1043 |
|
| 1044 | kdebug("[LOAD] va=%lx of=%lx fs=%lx ms=%lx",
|
| 1045 | (unsigned long) phdr->p_vaddr,
|
| 1046 | (unsigned long) phdr->p_offset,
|
| 1047 | (unsigned long) phdr->p_filesz,
|
| 1048 | (unsigned long) phdr->p_memsz);
|
| 1049 |
|
| 1050 |
|
| 1051 | if (phdr->p_flags & PF_R) prot |= PROT_READ;
|
| 1052 | if (phdr->p_flags & PF_W) prot |= PROT_WRITE;
|
| 1053 | if (phdr->p_flags & PF_X) prot |= PROT_EXEC;
|
| 1054 |
|
| 1055 | flags = MAP_PRIVATE;
|
| 1056 | maddr = 0;
|
| 1057 |
|
| 1058 | switch (params->flags & ELF_FDPIC_FLAG_ARRANGEMENT) {
|
| 1059 | case ELF_FDPIC_FLAG_INDEPENDENT:
|
| 1060 |
|
| 1061 | break;
|
| 1062 |
|
| 1063 | case ELF_FDPIC_FLAG_HONOURVADDR:
|
| 1064 |
|
| 1065 | maddr = phdr->p_vaddr;
|
| 1066 | flags |= MAP_FIXED;
|
| 1067 | break;
|
| 1068 |
|
| 1069 | case ELF_FDPIC_FLAG_CONSTDISP:
|
| 1070 | |
| 1071 | * - can be mapped anywhere, but must be mapped as a
|
| 1072 | * unit
|
| 1073 |
|
| 1074 | if (!dvset) {
|
| 1075 | maddr = load_addr;
|
| 1076 | delta_vaddr = phdr->p_vaddr;
|
| 1077 | dvset = 1;
|
| 1078 | } else {
|
| 1079 | maddr = load_addr + phdr->p_vaddr - delta_vaddr;
|
| 1080 | flags |= MAP_FIXED;
|
| 1081 | }
|
| 1082 | break;
|
| 1083 |
|
| 1084 | case ELF_FDPIC_FLAG_CONTIGUOUS:
|
| 1085 |
|
| 1086 | break;
|
| 1087 |
|
| 1088 | default:
|
| 1089 | BUG();
|
| 1090 | }
|
| 1091 |
|
| 1092 | maddr &= PAGE_MASK;
|
| 1093 |
|
| 1094 |
|
| 1095 | disp = phdr->p_vaddr & ~PAGE_MASK;
|
| 1096 | maddr = vm_mmap(file, maddr, phdr->p_memsz + disp, prot, flags,
|
| 1097 | phdr->p_offset - disp);
|
| 1098 |
|
| 1099 | kdebug("mmap[%d] <file> sz=%llx pr=%x fl=%x of=%llx --> %08lx",
|
| 1100 | loop, (unsigned long long) phdr->p_memsz + disp,
|
| 1101 | prot, flags, (unsigned long long) phdr->p_offset - disp,
|
| 1102 | maddr);
|
| 1103 |
|
| 1104 | if (IS_ERR_VALUE(maddr))
|
| 1105 | return (int) maddr;
|
| 1106 |
|
| 1107 | if ((params->flags & ELF_FDPIC_FLAG_ARRANGEMENT) ==
|
| 1108 | ELF_FDPIC_FLAG_CONTIGUOUS)
|
| 1109 | load_addr += PAGE_ALIGN(phdr->p_memsz + disp);
|
| 1110 |
|
| 1111 | seg->addr = maddr + disp;
|
| 1112 | seg->p_vaddr = phdr->p_vaddr;
|
| 1113 | seg->p_memsz = phdr->p_memsz;
|
| 1114 |
|
| 1115 |
|
| 1116 | if (phdr->p_offset == 0)
|
| 1117 | params->elfhdr_addr = seg->addr;
|
| 1118 |
|
| 1119 | |
| 1120 | * PT_LOAD
|
| 1121 | if (prot & PROT_WRITE && disp > 0) {
|
| 1122 | kdebug("clear[%d] ad=%lx sz=%lx", loop, maddr, disp);
|
| 1123 | if (clear_user((void __user *) maddr, disp))
|
| 1124 | return -EFAULT;
|
| 1125 | maddr += disp;
|
| 1126 | }
|
| 1127 |
|
| 1128 | |
| 1129 | * - on uClinux we can just clear the lot
|
| 1130 | * - on MMU linux we'll get a SIGBUS beyond the last page
|
| 1131 | * extant in the file
|
| 1132 |
|
| 1133 | excess = phdr->p_memsz - phdr->p_filesz;
|
| 1134 |
|
| 1135 | #ifdef CONFIG_MMU
|
| 1136 | unsigned long excess1
|
| 1137 | = PAGE_SIZE - ((maddr + phdr->p_filesz) & ~PAGE_MASK);
|
| 1138 | if (excess > excess1) {
|
| 1139 | unsigned long xaddr = maddr + phdr->p_filesz + excess1;
|
| 1140 | unsigned long xmaddr;
|
| 1141 |
|
| 1142 | flags |= MAP_FIXED | MAP_ANONYMOUS;
|
| 1143 | xmaddr = vm_mmap(NULL, xaddr, excess - excess1,
|
| 1144 | prot, flags, 0);
|
| 1145 |
|
| 1146 | kdebug("mmap[%d] <anon>"
|
| 1147 | " ad=%lx sz=%lx pr=%x fl=%x of=0 --> %08lx",
|
| 1148 | loop, xaddr, excess - excess1, prot, flags,
|
| 1149 | xmaddr);
|
| 1150 |
|
| 1151 | if (xmaddr != xaddr)
|
| 1152 | return -ENOMEM;
|
| 1153 | }
|
| 1154 |
|
| 1155 | if (prot & PROT_WRITE && excess1 > 0) {
|
| 1156 | kdebug("clear[%d] ad=%lx sz=%lx",
|
| 1157 | loop, maddr + phdr->p_filesz, excess1);
|
| 1158 | if (clear_user((void __user *) maddr + phdr->p_filesz,
|
| 1159 | excess1))
|
| 1160 | return -EFAULT;
|
| 1161 | }
|
| 1162 |
|
| 1163 | #else
|
| 1164 | if (excess > 0) {
|
| 1165 | kdebug("clear[%d] ad=%llx sz=%lx", loop,
|
| 1166 | (unsigned long long) maddr + phdr->p_filesz,
|
| 1167 | excess);
|
| 1168 | if (clear_user((void *) maddr + phdr->p_filesz, excess))
|
| 1169 | return -EFAULT;
|
| 1170 | }
|
| 1171 | #endif
|
| 1172 |
|
| 1173 | if (mm) {
|
| 1174 | if (phdr->p_flags & PF_X) {
|
| 1175 | if (!mm->start_code) {
|
| 1176 | mm->start_code = maddr;
|
| 1177 | mm->end_code = maddr + phdr->p_memsz;
|
| 1178 | }
|
| 1179 | } else if (!mm->start_data) {
|
| 1180 | mm->start_data = maddr;
|
| 1181 | mm->end_data = maddr + phdr->p_memsz;
|
| 1182 | }
|
| 1183 | }
|
| 1184 |
|
| 1185 | seg++;
|
| 1186 | }
|
| 1187 |
|
| 1188 | return 0;
|
| 1189 | }
|
| 1190 |
|
| 1191 |
|
| 1192 | |
| 1193 | * ELF-FDPIC core dumper
|
| 1194 | *
|
| 1195 | * Modelled on fs/exec.c:aout_core_dump()
|
| 1196 | * Jeremy Fitzhardinge <[email protected]>
|
| 1197 | *
|
| 1198 | * Modelled on fs/binfmt_elf.c core dumper
|
| 1199 |
|
| 1200 | #ifdef CONFIG_ELF_CORE
|
| 1201 |
|
| 1202 | struct elf_prstatus_fdpic
|
| 1203 | {
|
| 1204 | struct elf_prstatus_common common;
|
| 1205 | elf_gregset_t pr_reg;
|
| 1206 | |
| 1207 | * to GDB in order for GDB to do the necessary relocations. The
|
| 1208 | * fields (below) used to communicate this information are placed
|
| 1209 | * immediately after ``pr_reg'', so that the loadmap addresses may
|
| 1210 | * be viewed as part of the register set if so desired.
|
| 1211 |
|
| 1212 | unsigned long pr_exec_fdpic_loadmap;
|
| 1213 | unsigned long pr_interp_fdpic_loadmap;
|
| 1214 | int pr_fpvalid;
|
| 1215 | };
|
| 1216 |
|
| 1217 |
|
| 1218 | struct memelfnote
|
| 1219 | {
|
| 1220 | const char *name;
|
| 1221 | int type;
|
| 1222 | unsigned int datasz;
|
| 1223 | void *data;
|
| 1224 | };
|
| 1225 |
|
| 1226 | static int notesize(struct memelfnote *en)
|
| 1227 | {
|
| 1228 | int sz;
|
| 1229 |
|
| 1230 | sz = sizeof(struct elf_note);
|
| 1231 | sz += roundup(strlen(en->name) + 1, 4);
|
| 1232 | sz += roundup(en->datasz, 4);
|
| 1233 |
|
| 1234 | return sz;
|
| 1235 | }
|
| 1236 |
|
| 1237 |
|
| 1238 |
|
| 1239 | static int writenote(struct memelfnote *men, struct coredump_params *cprm)
|
| 1240 | {
|
| 1241 | struct elf_note en;
|
| 1242 | en.n_namesz = strlen(men->name) + 1;
|
| 1243 | en.n_descsz = men->datasz;
|
| 1244 | en.n_type = men->type;
|
| 1245 |
|
| 1246 | return dump_emit(cprm, &en, sizeof(en)) &&
|
| 1247 | dump_emit(cprm, men->name, en.n_namesz) && dump_align(cprm, 4) &&
|
| 1248 | dump_emit(cprm, men->data, men->datasz) && dump_align(cprm, 4);
|
| 1249 | }
|
| 1250 |
|
| 1251 | static inline void fill_elf_fdpic_header(struct elfhdr *elf, int segs)
|
| 1252 | {
|
| 1253 | memcpy(elf->e_ident, ELFMAG, SELFMAG);
|
| 1254 | elf->e_ident[EI_CLASS] = ELF_CLASS;
|
| 1255 | elf->e_ident[EI_DATA] = ELF_DATA;
|
| 1256 | elf->e_ident[EI_VERSION] = EV_CURRENT;
|
| 1257 | elf->e_ident[EI_OSABI] = ELF_OSABI;
|
| 1258 | memset(elf->e_ident+EI_PAD, 0, EI_NIDENT-EI_PAD);
|
| 1259 |
|
| 1260 | elf->e_type = ET_CORE;
|
| 1261 | elf->e_machine = ELF_ARCH;
|
| 1262 | elf->e_version = EV_CURRENT;
|
| 1263 | elf->e_entry = 0;
|
| 1264 | elf->e_phoff = sizeof(struct elfhdr);
|
| 1265 | elf->e_shoff = 0;
|
| 1266 | elf->e_flags = ELF_FDPIC_CORE_EFLAGS;
|
| 1267 | elf->e_ehsize = sizeof(struct elfhdr);
|
| 1268 | elf->e_phentsize = sizeof(struct elf_phdr);
|
| 1269 | elf->e_phnum = segs;
|
| 1270 | elf->e_shentsize = 0;
|
| 1271 | elf->e_shnum = 0;
|
| 1272 | elf->e_shstrndx = 0;
|
| 1273 | return;
|
| 1274 | }
|
| 1275 |
|
| 1276 | static inline void fill_elf_note_phdr(struct elf_phdr *phdr, int sz, loff_t offset)
|
| 1277 | {
|
| 1278 | phdr->p_type = PT_NOTE;
|
| 1279 | phdr->p_offset = offset;
|
| 1280 | phdr->p_vaddr = 0;
|
| 1281 | phdr->p_paddr = 0;
|
| 1282 | phdr->p_filesz = sz;
|
| 1283 | phdr->p_memsz = 0;
|
| 1284 | phdr->p_flags = 0;
|
| 1285 | phdr->p_align = 4;
|
| 1286 | return;
|
| 1287 | }
|
| 1288 |
|
| 1289 | static inline void __fill_note(struct memelfnote *note, const char *name, int type,
|
| 1290 | unsigned int sz, void *data)
|
| 1291 | {
|
| 1292 | note->name = name;
|
| 1293 | note->type = type;
|
| 1294 | note->datasz = sz;
|
| 1295 | note->data = data;
|
| 1296 | return;
|
| 1297 | }
|
| 1298 |
|
| 1299 | #define fill_note(note, type, sz, data) \
|
| 1300 | __fill_note(note, NN_ ## type, NT_ ## type, sz, data)
|
| 1301 |
|
| 1302 | |
| 1303 | * fill up all the fields in prstatus from the given task struct, except
|
| 1304 | * registers which need to be filled up separately.
|
| 1305 |
|
| 1306 | static void fill_prstatus(struct elf_prstatus_common *prstatus,
|
| 1307 | struct task_struct *p, long signr)
|
| 1308 | {
|
| 1309 | prstatus->pr_info.si_signo = prstatus->pr_cursig = signr;
|
| 1310 | prstatus->pr_sigpend = p->pending.signal.sig[0];
|
| 1311 | prstatus->pr_sighold = p->blocked.sig[0];
|
| 1312 | rcu_read_lock();
|
| 1313 | prstatus->pr_ppid = task_pid_vnr(rcu_dereference(p->real_parent));
|
| 1314 | rcu_read_unlock();
|
| 1315 | prstatus->pr_pid = task_pid_vnr(p);
|
| 1316 | prstatus->pr_pgrp = task_pgrp_vnr(p);
|
| 1317 | prstatus->pr_sid = task_session_vnr(p);
|
| 1318 | if (thread_group_leader(p)) {
|
| 1319 | struct task_cputime cputime;
|
| 1320 |
|
| 1321 | |
| 1322 | * This is the record for the group leader. It shows the
|
| 1323 | * group-wide total, not its individual thread total.
|
| 1324 |
|
| 1325 | thread_group_cputime(p, &cputime);
|
| 1326 | prstatus->pr_utime = ns_to_kernel_old_timeval(cputime.utime);
|
| 1327 | prstatus->pr_stime = ns_to_kernel_old_timeval(cputime.stime);
|
| 1328 | } else {
|
| 1329 | u64 utime, stime;
|
| 1330 |
|
| 1331 | task_cputime(p, &utime, &stime);
|
| 1332 | prstatus->pr_utime = ns_to_kernel_old_timeval(utime);
|
| 1333 | prstatus->pr_stime = ns_to_kernel_old_timeval(stime);
|
| 1334 | }
|
| 1335 | prstatus->pr_cutime = ns_to_kernel_old_timeval(p->signal->cutime);
|
| 1336 | prstatus->pr_cstime = ns_to_kernel_old_timeval(p->signal->cstime);
|
| 1337 | }
|
| 1338 |
|
| 1339 | static int fill_psinfo(struct elf_prpsinfo *psinfo, struct task_struct *p,
|
| 1340 | struct mm_struct *mm)
|
| 1341 | {
|
| 1342 | const struct cred *cred;
|
| 1343 | unsigned int i, len;
|
| 1344 | unsigned int state;
|
| 1345 |
|
| 1346 |
|
| 1347 | memset(psinfo, 0, sizeof(struct elf_prpsinfo));
|
| 1348 |
|
| 1349 | len = mm->arg_end - mm->arg_start;
|
| 1350 | if (len >= ELF_PRARGSZ)
|
| 1351 | len = ELF_PRARGSZ - 1;
|
| 1352 | if (copy_from_user(&psinfo->pr_psargs,
|
| 1353 | (const char __user *) mm->arg_start, len))
|
| 1354 | return -EFAULT;
|
| 1355 | for (i = 0; i < len; i++)
|
| 1356 | if (psinfo->pr_psargs[i] == 0)
|
| 1357 | psinfo->pr_psargs[i] = ' ';
|
| 1358 | psinfo->pr_psargs[len] = 0;
|
| 1359 |
|
| 1360 | rcu_read_lock();
|
| 1361 | psinfo->pr_ppid = task_pid_vnr(rcu_dereference(p->real_parent));
|
| 1362 | rcu_read_unlock();
|
| 1363 | psinfo->pr_pid = task_pid_vnr(p);
|
| 1364 | psinfo->pr_pgrp = task_pgrp_vnr(p);
|
| 1365 | psinfo->pr_sid = task_session_vnr(p);
|
| 1366 |
|
| 1367 | state = READ_ONCE(p->__state);
|
| 1368 | i = state ? ffz(~state) + 1 : 0;
|
| 1369 | psinfo->pr_state = i;
|
| 1370 | psinfo->pr_sname = (i > 5) ? '.' : "RSDTZW"[i];
|
| 1371 | psinfo->pr_zomb = psinfo->pr_sname == 'Z';
|
| 1372 | psinfo->pr_nice = task_nice(p);
|
| 1373 | psinfo->pr_flag = p->flags;
|
| 1374 | rcu_read_lock();
|
| 1375 | cred = __task_cred(p);
|
| 1376 | SET_UID(psinfo->pr_uid, from_kuid_munged(cred->user_ns, cred->uid));
|
| 1377 | SET_GID(psinfo->pr_gid, from_kgid_munged(cred->user_ns, cred->gid));
|
| 1378 | rcu_read_unlock();
|
| 1379 | get_task_comm(psinfo->pr_fname, p);
|
| 1380 |
|
| 1381 | return 0;
|
| 1382 | }
|
| 1383 |
|
| 1384 |
|
| 1385 | struct elf_thread_status
|
| 1386 | {
|
| 1387 | struct elf_thread_status *next;
|
| 1388 | struct elf_prstatus_fdpic prstatus;
|
| 1389 | elf_fpregset_t fpu;
|
| 1390 | struct memelfnote notes[2];
|
| 1391 | int num_notes;
|
| 1392 | };
|
| 1393 |
|
| 1394 | |
| 1395 | * In order to add the specific thread information for the elf file format,
|
| 1396 | * we need to keep a linked list of every thread's pr_status and then create
|
| 1397 | * a single section for them in the final core file.
|
| 1398 |
|
| 1399 | static struct elf_thread_status *elf_dump_thread_status(long signr, struct task_struct *p, int *sz)
|
| 1400 | {
|
| 1401 | const struct user_regset_view *view = task_user_regset_view(p);
|
| 1402 | struct elf_thread_status *t;
|
| 1403 | int i, ret;
|
| 1404 |
|
| 1405 | t = kzalloc_obj(struct elf_thread_status);
|
| 1406 | if (!t)
|
| 1407 | return t;
|
| 1408 |
|
| 1409 | fill_prstatus(&t->prstatus.common, p, signr);
|
| 1410 | t->prstatus.pr_exec_fdpic_loadmap = p->mm->context.exec_fdpic_loadmap;
|
| 1411 | t->prstatus.pr_interp_fdpic_loadmap = p->mm->context.interp_fdpic_loadmap;
|
| 1412 | regset_get(p, &view->regsets[0],
|
| 1413 | sizeof(t->prstatus.pr_reg), &t->prstatus.pr_reg);
|
| 1414 |
|
| 1415 | fill_note(&t->notes[0], PRSTATUS, sizeof(t->prstatus), &t->prstatus);
|
| 1416 | t->num_notes++;
|
| 1417 | *sz += notesize(&t->notes[0]);
|
| 1418 |
|
| 1419 | for (i = 1; i < view->n; ++i) {
|
| 1420 | const struct user_regset *regset = &view->regsets[i];
|
| 1421 | if (regset->core_note_type != NT_PRFPREG)
|
| 1422 | continue;
|
| 1423 | if (regset->active && regset->active(p, regset) <= 0)
|
| 1424 | continue;
|
| 1425 | ret = regset_get(p, regset, sizeof(t->fpu), &t->fpu);
|
| 1426 | if (ret >= 0)
|
| 1427 | t->prstatus.pr_fpvalid = 1;
|
| 1428 | break;
|
| 1429 | }
|
| 1430 |
|
| 1431 | if (t->prstatus.pr_fpvalid) {
|
| 1432 | fill_note(&t->notes[1], PRFPREG, sizeof(t->fpu), &t->fpu);
|
| 1433 | t->num_notes++;
|
| 1434 | *sz += notesize(&t->notes[1]);
|
| 1435 | }
|
| 1436 | return t;
|
| 1437 | }
|
| 1438 |
|
| 1439 | static void fill_extnum_info(struct elfhdr *elf, struct elf_shdr *shdr4extnum,
|
| 1440 | elf_addr_t e_shoff, int segs)
|
| 1441 | {
|
| 1442 | elf->e_shoff = e_shoff;
|
| 1443 | elf->e_shentsize = sizeof(*shdr4extnum);
|
| 1444 | elf->e_shnum = 1;
|
| 1445 | elf->e_shstrndx = SHN_UNDEF;
|
| 1446 |
|
| 1447 | memset(shdr4extnum, 0, sizeof(*shdr4extnum));
|
| 1448 |
|
| 1449 | shdr4extnum->sh_type = SHT_NULL;
|
| 1450 | shdr4extnum->sh_size = elf->e_shnum;
|
| 1451 | shdr4extnum->sh_link = elf->e_shstrndx;
|
| 1452 | shdr4extnum->sh_info = segs;
|
| 1453 | }
|
| 1454 |
|
| 1455 | |
| 1456 | * dump the segments for an MMU process
|
| 1457 |
|
| 1458 | static bool elf_fdpic_dump_segments(struct coredump_params *cprm,
|
| 1459 | struct core_vma_metadata *vma_meta,
|
| 1460 | int vma_count)
|
| 1461 | {
|
| 1462 | int i;
|
| 1463 |
|
| 1464 | for (i = 0; i < vma_count; i++) {
|
| 1465 | struct core_vma_metadata *meta = vma_meta + i;
|
| 1466 |
|
| 1467 | if (!dump_user_range(cprm, meta->start, meta->dump_size))
|
| 1468 | return false;
|
| 1469 | }
|
| 1470 | return true;
|
| 1471 | }
|
| 1472 |
|
| 1473 | |
| 1474 | * Actual dumper
|
| 1475 | *
|
| 1476 | * This is a two-pass process; first we find the offsets of the bits,
|
| 1477 | * and then they are actually written out. If we run out of core limit
|
| 1478 | * we just truncate.
|
| 1479 |
|
| 1480 | static bool elf_fdpic_core_dump(struct coredump_params *cprm)
|
| 1481 | {
|
| 1482 | bool ret = false;
|
| 1483 | int segs;
|
| 1484 | int i;
|
| 1485 | struct elfhdr *elf = NULL;
|
| 1486 | loff_t offset = 0, dataoff;
|
| 1487 | struct memelfnote psinfo_note, auxv_note;
|
| 1488 | struct elf_prpsinfo *psinfo = NULL;
|
| 1489 | struct elf_thread_status *thread_list = NULL;
|
| 1490 | int thread_status_size = 0;
|
| 1491 | elf_addr_t *auxv;
|
| 1492 | struct elf_phdr *phdr4note = NULL;
|
| 1493 | struct elf_shdr *shdr4extnum = NULL;
|
| 1494 | Elf_Half e_phnum;
|
| 1495 | elf_addr_t e_shoff;
|
| 1496 | struct core_thread *ct;
|
| 1497 | struct elf_thread_status *tmp;
|
| 1498 |
|
| 1499 |
|
| 1500 | elf = kmalloc_obj(*elf);
|
| 1501 | if (!elf)
|
| 1502 | goto end_coredump;
|
| 1503 | psinfo = kmalloc_obj(*psinfo);
|
| 1504 | if (!psinfo)
|
| 1505 | goto end_coredump;
|
| 1506 |
|
| 1507 | for (ct = current->signal->core_state->tasks;
|
| 1508 | ct; ct = ct->next) {
|
| 1509 | tmp = elf_dump_thread_status(cprm->siginfo->si_signo,
|
| 1510 | ct->task, &thread_status_size);
|
| 1511 | if (!tmp)
|
| 1512 | goto end_coredump;
|
| 1513 |
|
| 1514 | tmp->next = thread_list;
|
| 1515 | thread_list = tmp;
|
| 1516 | }
|
| 1517 |
|
| 1518 |
|
| 1519 | tmp = elf_dump_thread_status(cprm->siginfo->si_signo,
|
| 1520 | current, &thread_status_size);
|
| 1521 | if (!tmp)
|
| 1522 | goto end_coredump;
|
| 1523 | tmp->next = thread_list;
|
| 1524 | thread_list = tmp;
|
| 1525 |
|
| 1526 | segs = cprm->vma_count + elf_core_extra_phdrs(cprm);
|
| 1527 |
|
| 1528 |
|
| 1529 | segs++;
|
| 1530 |
|
| 1531 | |
| 1532 | * this, kernel supports extended numbering. Have a look at
|
| 1533 | * include/linux/elf.h for further information.
|
| 1534 | e_phnum = segs > PN_XNUM ? PN_XNUM : segs;
|
| 1535 |
|
| 1536 |
|
| 1537 | fill_elf_fdpic_header(elf, e_phnum);
|
| 1538 |
|
| 1539 | cprm->state |= COREDUMP_STATE_STARTED;
|
| 1540 | |
| 1541 | * Set up the notes in similar form to SVR4 core dumps made
|
| 1542 | * with info from their /proc.
|
| 1543 |
|
| 1544 |
|
| 1545 | fill_psinfo(psinfo, current->group_leader, current->mm);
|
| 1546 | fill_note(&psinfo_note, PRPSINFO, sizeof(*psinfo), psinfo);
|
| 1547 | thread_status_size += notesize(&psinfo_note);
|
| 1548 |
|
| 1549 | auxv = (elf_addr_t *) current->mm->saved_auxv;
|
| 1550 | i = 0;
|
| 1551 | do
|
| 1552 | i += 2;
|
| 1553 | while (auxv[i - 2] != AT_NULL);
|
| 1554 | fill_note(&auxv_note, AUXV, i * sizeof(elf_addr_t), auxv);
|
| 1555 | thread_status_size += notesize(&auxv_note);
|
| 1556 |
|
| 1557 | offset = sizeof(*elf);
|
| 1558 | offset += segs * sizeof(struct elf_phdr);
|
| 1559 |
|
| 1560 |
|
| 1561 | phdr4note = kmalloc_obj(*phdr4note);
|
| 1562 | if (!phdr4note)
|
| 1563 | goto end_coredump;
|
| 1564 |
|
| 1565 | fill_elf_note_phdr(phdr4note, thread_status_size, offset);
|
| 1566 | offset += thread_status_size;
|
| 1567 |
|
| 1568 |
|
| 1569 | dataoff = offset = roundup(offset, ELF_EXEC_PAGESIZE);
|
| 1570 |
|
| 1571 | offset += cprm->vma_data_size;
|
| 1572 | offset += elf_core_extra_data_size(cprm);
|
| 1573 | e_shoff = offset;
|
| 1574 |
|
| 1575 | if (e_phnum == PN_XNUM) {
|
| 1576 | shdr4extnum = kmalloc_obj(*shdr4extnum);
|
| 1577 | if (!shdr4extnum)
|
| 1578 | goto end_coredump;
|
| 1579 | fill_extnum_info(elf, shdr4extnum, e_shoff, segs);
|
| 1580 | }
|
| 1581 |
|
| 1582 | offset = dataoff;
|
| 1583 |
|
| 1584 | if (!dump_emit(cprm, elf, sizeof(*elf)))
|
| 1585 | goto end_coredump;
|
| 1586 |
|
| 1587 | if (!dump_emit(cprm, phdr4note, sizeof(*phdr4note)))
|
| 1588 | goto end_coredump;
|
| 1589 |
|
| 1590 |
|
| 1591 | for (i = 0; i < cprm->vma_count; i++) {
|
| 1592 | struct core_vma_metadata *meta = cprm->vma_meta + i;
|
| 1593 | struct elf_phdr phdr;
|
| 1594 | size_t sz;
|
| 1595 |
|
| 1596 | sz = meta->end - meta->start;
|
| 1597 |
|
| 1598 | phdr.p_type = PT_LOAD;
|
| 1599 | phdr.p_offset = offset;
|
| 1600 | phdr.p_vaddr = meta->start;
|
| 1601 | phdr.p_paddr = 0;
|
| 1602 | phdr.p_filesz = meta->dump_size;
|
| 1603 | phdr.p_memsz = sz;
|
| 1604 | offset += phdr.p_filesz;
|
| 1605 | phdr.p_flags = 0;
|
| 1606 | if (meta->flags & VM_READ)
|
| 1607 | phdr.p_flags |= PF_R;
|
| 1608 | if (meta->flags & VM_WRITE)
|
| 1609 | phdr.p_flags |= PF_W;
|
| 1610 | if (meta->flags & VM_EXEC)
|
| 1611 | phdr.p_flags |= PF_X;
|
| 1612 | phdr.p_align = ELF_EXEC_PAGESIZE;
|
| 1613 |
|
| 1614 | if (!dump_emit(cprm, &phdr, sizeof(phdr)))
|
| 1615 | goto end_coredump;
|
| 1616 | }
|
| 1617 |
|
| 1618 | if (!elf_core_write_extra_phdrs(cprm, offset))
|
| 1619 | goto end_coredump;
|
| 1620 |
|
| 1621 |
|
| 1622 | if (!writenote(thread_list->notes, cprm))
|
| 1623 | goto end_coredump;
|
| 1624 | if (!writenote(&psinfo_note, cprm))
|
| 1625 | goto end_coredump;
|
| 1626 | if (!writenote(&auxv_note, cprm))
|
| 1627 | goto end_coredump;
|
| 1628 | for (i = 1; i < thread_list->num_notes; i++)
|
| 1629 | if (!writenote(thread_list->notes + i, cprm))
|
| 1630 | goto end_coredump;
|
| 1631 |
|
| 1632 |
|
| 1633 | for (tmp = thread_list->next; tmp; tmp = tmp->next) {
|
| 1634 | for (i = 0; i < tmp->num_notes; i++)
|
| 1635 | if (!writenote(&tmp->notes[i], cprm))
|
| 1636 | goto end_coredump;
|
| 1637 | }
|
| 1638 |
|
| 1639 | dump_skip_to(cprm, dataoff);
|
| 1640 |
|
| 1641 | if (!elf_fdpic_dump_segments(cprm, cprm->vma_meta, cprm->vma_count))
|
| 1642 | goto end_coredump;
|
| 1643 |
|
| 1644 | if (!elf_core_write_extra_data(cprm))
|
| 1645 | goto end_coredump;
|
| 1646 |
|
| 1647 | if (e_phnum == PN_XNUM) {
|
| 1648 | if (!dump_emit(cprm, shdr4extnum, sizeof(*shdr4extnum)))
|
| 1649 | goto end_coredump;
|
| 1650 | }
|
| 1651 |
|
| 1652 | if (cprm->file->f_pos != offset) {
|
| 1653 |
|
| 1654 | printk(KERN_WARNING
|
| 1655 | "elf_core_dump: file->f_pos (%lld) != offset (%lld)\n",
|
| 1656 | cprm->file->f_pos, offset);
|
| 1657 | }
|
| 1658 |
|
| 1659 | ret = true;
|
| 1660 |
|
| 1661 | end_coredump:
|
| 1662 | while (thread_list) {
|
| 1663 | tmp = thread_list;
|
| 1664 | thread_list = thread_list->next;
|
| 1665 | kfree(tmp);
|
| 1666 | }
|
| 1667 | kfree(phdr4note);
|
| 1668 | kfree(elf);
|
| 1669 | kfree(psinfo);
|
| 1670 | kfree(shdr4extnum);
|
| 1671 | return ret;
|
| 1672 | }
|
| 1673 |
|
| 1674 | #endif
|