1 /*- 2 * Copyright (c) 1998 Michael Smith <msmith@freebsd.org> 3 * Copyright (c) 1998 Peter Wemm <peter@freebsd.org> 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 25 * SUCH DAMAGE. 26 */ 27 28 #include <sys/cdefs.h> 29 __FBSDID("$FreeBSD$"); 30 31 #include <sys/param.h> 32 #include <sys/endian.h> 33 #include <sys/exec.h> 34 #include <sys/linker.h> 35 #include <sys/module.h> 36 #include <sys/stdint.h> 37 #include <string.h> 38 #include <machine/elf.h> 39 #include <stand.h> 40 #define FREEBSD_ELF 41 #include <sys/link_elf.h> 42 43 #include "bootstrap.h" 44 45 #define COPYOUT(s,d,l) archsw.arch_copyout((vm_offset_t)(s), d, l) 46 47 #if defined(__i386__) && __ELF_WORD_SIZE == 64 48 #undef ELF_TARG_CLASS 49 #undef ELF_TARG_MACH 50 #define ELF_TARG_CLASS ELFCLASS64 51 #define ELF_TARG_MACH EM_X86_64 52 #endif 53 54 typedef struct elf_file { 55 Elf_Phdr *ph; 56 Elf_Ehdr *ehdr; 57 Elf_Sym *symtab; 58 Elf_Hashelt *hashtab; 59 Elf_Hashelt nbuckets; 60 Elf_Hashelt nchains; 61 Elf_Hashelt *buckets; 62 Elf_Hashelt *chains; 63 Elf_Rel *rel; 64 size_t relsz; 65 Elf_Rela *rela; 66 size_t relasz; 67 char *strtab; 68 size_t strsz; 69 int fd; 70 caddr_t firstpage; 71 size_t firstlen; 72 int kernel; 73 uint64_t off; 74 #ifdef LOADER_VERIEXEC_VECTX 75 struct vectx *vctx; 76 #endif 77 } *elf_file_t; 78 79 #ifdef LOADER_VERIEXEC_VECTX 80 #define VECTX_HANDLE(ef) (ef)->vctx 81 #else 82 #define VECTX_HANDLE(ef) (ef)->fd 83 #endif 84 85 static int __elfN(loadimage)(struct preloaded_file *mp, elf_file_t ef, 86 uint64_t loadaddr); 87 static int __elfN(lookup_symbol)(elf_file_t ef, const char* name, 88 Elf_Sym *sym, unsigned char type); 89 static int __elfN(reloc_ptr)(struct preloaded_file *mp, elf_file_t ef, 90 Elf_Addr p, void *val, size_t len); 91 static int __elfN(parse_modmetadata)(struct preloaded_file *mp, elf_file_t ef, 92 Elf_Addr p_start, Elf_Addr p_end); 93 static symaddr_fn __elfN(symaddr); 94 static char *fake_modname(const char *name); 95 96 const char *__elfN(kerneltype) = "elf kernel"; 97 const char *__elfN(moduletype) = "elf module"; 98 99 uint64_t __elfN(relocation_offset) = 0; 100 101 #ifdef __powerpc__ 102 extern void elf_wrong_field_size(void); 103 #define CONVERT_FIELD(b, f, e) \ 104 switch (sizeof((b)->f)) { \ 105 case 2: \ 106 (b)->f = e ## 16toh((b)->f); \ 107 break; \ 108 case 4: \ 109 (b)->f = e ## 32toh((b)->f); \ 110 break; \ 111 case 8: \ 112 (b)->f = e ## 64toh((b)->f); \ 113 break; \ 114 default: \ 115 /* Force a link time error. */ \ 116 elf_wrong_field_size(); \ 117 break; \ 118 } 119 120 #define CONVERT_SWITCH(h, d, f) \ 121 switch ((h)->e_ident[EI_DATA]) { \ 122 case ELFDATA2MSB: \ 123 f(d, be); \ 124 break; \ 125 case ELFDATA2LSB: \ 126 f(d, le); \ 127 break; \ 128 default: \ 129 return (EINVAL); \ 130 } 131 132 133 static int elf_header_convert(Elf_Ehdr *ehdr) 134 { 135 /* 136 * Fixup ELF header endianness. 137 * 138 * The Xhdr structure was loaded using block read call to optimize file 139 * accesses. It might happen, that the endianness of the system memory 140 * is different that endianness of the ELF header. Swap fields here to 141 * guarantee that Xhdr always contain valid data regardless of 142 * architecture. 143 */ 144 #define HEADER_FIELDS(b, e) \ 145 CONVERT_FIELD(b, e_type, e); \ 146 CONVERT_FIELD(b, e_machine, e); \ 147 CONVERT_FIELD(b, e_version, e); \ 148 CONVERT_FIELD(b, e_entry, e); \ 149 CONVERT_FIELD(b, e_phoff, e); \ 150 CONVERT_FIELD(b, e_shoff, e); \ 151 CONVERT_FIELD(b, e_flags, e); \ 152 CONVERT_FIELD(b, e_ehsize, e); \ 153 CONVERT_FIELD(b, e_phentsize, e); \ 154 CONVERT_FIELD(b, e_phnum, e); \ 155 CONVERT_FIELD(b, e_shentsize, e); \ 156 CONVERT_FIELD(b, e_shnum, e); \ 157 CONVERT_FIELD(b, e_shstrndx, e) 158 159 CONVERT_SWITCH(ehdr, ehdr, HEADER_FIELDS); 160 161 #undef HEADER_FIELDS 162 163 return (0); 164 } 165 166 static int elf_program_header_convert(const Elf_Ehdr *ehdr, Elf_Phdr *phdr) 167 { 168 #define PROGRAM_HEADER_FIELDS(b, e) \ 169 CONVERT_FIELD(b, p_type, e); \ 170 CONVERT_FIELD(b, p_flags, e); \ 171 CONVERT_FIELD(b, p_offset, e); \ 172 CONVERT_FIELD(b, p_vaddr, e); \ 173 CONVERT_FIELD(b, p_paddr, e); \ 174 CONVERT_FIELD(b, p_filesz, e); \ 175 CONVERT_FIELD(b, p_memsz, e); \ 176 CONVERT_FIELD(b, p_align, e) 177 178 CONVERT_SWITCH(ehdr, phdr, PROGRAM_HEADER_FIELDS); 179 180 #undef PROGRAM_HEADER_FIELDS 181 182 return (0); 183 } 184 185 static int elf_section_header_convert(const Elf_Ehdr *ehdr, Elf_Shdr *shdr) 186 { 187 #define SECTION_HEADER_FIELDS(b, e) \ 188 CONVERT_FIELD(b, sh_name, e); \ 189 CONVERT_FIELD(b, sh_type, e); \ 190 CONVERT_FIELD(b, sh_link, e); \ 191 CONVERT_FIELD(b, sh_info, e); \ 192 CONVERT_FIELD(b, sh_flags, e); \ 193 CONVERT_FIELD(b, sh_addr, e); \ 194 CONVERT_FIELD(b, sh_offset, e); \ 195 CONVERT_FIELD(b, sh_size, e); \ 196 CONVERT_FIELD(b, sh_addralign, e); \ 197 CONVERT_FIELD(b, sh_entsize, e) 198 199 CONVERT_SWITCH(ehdr, shdr, SECTION_HEADER_FIELDS); 200 201 #undef SECTION_HEADER_FIELDS 202 203 return (0); 204 } 205 #undef CONVERT_SWITCH 206 #undef CONVERT_FIELD 207 #else 208 static int elf_header_convert(Elf_Ehdr *ehdr) 209 { 210 return (0); 211 } 212 213 static int elf_program_header_convert(const Elf_Ehdr *ehdr, Elf_Phdr *phdr) 214 { 215 return (0); 216 } 217 218 static int elf_section_header_convert(const Elf_Ehdr *ehdr, Elf_Shdr *shdr) 219 { 220 return (0); 221 } 222 #endif 223 224 #ifdef __amd64__ 225 static bool 226 is_kernphys_relocatable(elf_file_t ef) 227 { 228 Elf_Sym sym; 229 230 return (__elfN(lookup_symbol)(ef, "kernphys", &sym, STT_OBJECT) == 0); 231 } 232 #endif 233 234 #ifdef __i386__ 235 static bool 236 is_tg_kernel_support(struct preloaded_file *fp, elf_file_t ef) 237 { 238 Elf_Sym sym; 239 Elf_Addr p_start, p_end, v, p; 240 char vd_name[16]; 241 int error; 242 243 if (__elfN(lookup_symbol)(ef, "__start_set_vt_drv_set", &sym, STT_NOTYPE) != 0) 244 return (false); 245 p_start = sym.st_value + ef->off; 246 if (__elfN(lookup_symbol)(ef, "__stop_set_vt_drv_set", &sym, STT_NOTYPE) != 0) 247 return (false); 248 p_end = sym.st_value + ef->off; 249 250 /* 251 * Walk through vt_drv_set, each vt driver structure starts with 252 * static 16 chars for driver name. If we have "vbefb", return true. 253 */ 254 for (p = p_start; p < p_end; p += sizeof(Elf_Addr)) { 255 COPYOUT(p, &v, sizeof(v)); 256 257 error = __elfN(reloc_ptr)(fp, ef, p, &v, sizeof(v)); 258 if (error == EOPNOTSUPP) 259 v += ef->off; 260 else if (error != 0) 261 return (false); 262 COPYOUT(v, &vd_name, sizeof(vd_name)); 263 if (strncmp(vd_name, "vbefb", sizeof(vd_name)) == 0) 264 return (true); 265 } 266 267 return (false); 268 } 269 #endif 270 271 static int 272 __elfN(load_elf_header)(char *filename, elf_file_t ef) 273 { 274 ssize_t bytes_read; 275 Elf_Ehdr *ehdr; 276 int err; 277 278 /* 279 * Open the image, read and validate the ELF header 280 */ 281 if (filename == NULL) /* can't handle nameless */ 282 return (EFTYPE); 283 if ((ef->fd = open(filename, O_RDONLY)) == -1) 284 return (errno); 285 ef->firstpage = malloc(PAGE_SIZE); 286 if (ef->firstpage == NULL) { 287 close(ef->fd); 288 return (ENOMEM); 289 } 290 preload(ef->fd); 291 #ifdef LOADER_VERIEXEC_VECTX 292 { 293 int verror; 294 295 ef->vctx = vectx_open(ef->fd, filename, 0L, NULL, &verror, __func__); 296 if (verror) { 297 printf("Unverified %s: %s\n", filename, ve_error_get()); 298 close(ef->fd); 299 free(ef->vctx); 300 return (EAUTH); 301 } 302 } 303 #endif 304 bytes_read = VECTX_READ(VECTX_HANDLE(ef), ef->firstpage, PAGE_SIZE); 305 ef->firstlen = (size_t)bytes_read; 306 if (bytes_read < 0 || ef->firstlen <= sizeof(Elf_Ehdr)) { 307 err = EFTYPE; /* could be EIO, but may be small file */ 308 goto error; 309 } 310 ehdr = ef->ehdr = (Elf_Ehdr *)ef->firstpage; 311 312 /* Is it ELF? */ 313 if (!IS_ELF(*ehdr)) { 314 err = EFTYPE; 315 goto error; 316 } 317 318 if (ehdr->e_ident[EI_CLASS] != ELF_TARG_CLASS || /* Layout ? */ 319 ehdr->e_ident[EI_DATA] != ELF_TARG_DATA || 320 ehdr->e_ident[EI_VERSION] != EV_CURRENT) /* Version ? */ { 321 err = EFTYPE; 322 goto error; 323 } 324 325 err = elf_header_convert(ehdr); 326 if (err) 327 goto error; 328 329 if (ehdr->e_version != EV_CURRENT || ehdr->e_machine != ELF_TARG_MACH) { 330 /* Machine ? */ 331 err = EFTYPE; 332 goto error; 333 } 334 335 #if defined(LOADER_VERIEXEC) && !defined(LOADER_VERIEXEC_VECTX) 336 if (verify_file(ef->fd, filename, bytes_read, VE_MUST, __func__) < 0) { 337 err = EAUTH; 338 goto error; 339 } 340 #endif 341 return (0); 342 343 error: 344 if (ef->firstpage != NULL) { 345 free(ef->firstpage); 346 ef->firstpage = NULL; 347 } 348 if (ef->fd != -1) { 349 #ifdef LOADER_VERIEXEC_VECTX 350 free(ef->vctx); 351 #endif 352 close(ef->fd); 353 ef->fd = -1; 354 } 355 return (err); 356 } 357 358 /* 359 * Attempt to load the file (file) as an ELF module. It will be stored at 360 * (dest), and a pointer to a module structure describing the loaded object 361 * will be saved in (result). 362 */ 363 int 364 __elfN(loadfile)(char *filename, uint64_t dest, struct preloaded_file **result) 365 { 366 return (__elfN(loadfile_raw)(filename, dest, result, 0)); 367 } 368 369 int 370 __elfN(loadfile_raw)(char *filename, uint64_t dest, 371 struct preloaded_file **result, int multiboot) 372 { 373 struct preloaded_file *fp, *kfp; 374 struct elf_file ef; 375 Elf_Ehdr *ehdr; 376 int err; 377 378 fp = NULL; 379 bzero(&ef, sizeof(struct elf_file)); 380 ef.fd = -1; 381 382 err = __elfN(load_elf_header)(filename, &ef); 383 if (err != 0) 384 return (err); 385 386 ehdr = ef.ehdr; 387 388 /* 389 * Check to see what sort of module we are. 390 */ 391 kfp = file_findfile(NULL, __elfN(kerneltype)); 392 #ifdef __powerpc__ 393 /* 394 * Kernels can be ET_DYN, so just assume the first loaded object is the 395 * kernel. This assumption will be checked later. 396 */ 397 if (kfp == NULL) 398 ef.kernel = 1; 399 #endif 400 if (ef.kernel || ehdr->e_type == ET_EXEC) { 401 /* Looks like a kernel */ 402 if (kfp != NULL) { 403 printf("elf" __XSTRING(__ELF_WORD_SIZE) 404 "_loadfile: kernel already loaded\n"); 405 err = EPERM; 406 goto oerr; 407 } 408 /* 409 * Calculate destination address based on kernel entrypoint. 410 * 411 * For ARM, the destination address is independent of any values 412 * in the elf header (an ARM kernel can be loaded at any 2MB 413 * boundary), so we leave dest set to the value calculated by 414 * archsw.arch_loadaddr() and passed in to this function. 415 */ 416 #ifndef __arm__ 417 if (ehdr->e_type == ET_EXEC) 418 dest = (ehdr->e_entry & ~PAGE_MASK); 419 #endif 420 if ((ehdr->e_entry & ~PAGE_MASK) == 0) { 421 printf("elf" __XSTRING(__ELF_WORD_SIZE) 422 "_loadfile: not a kernel (maybe static binary?)\n"); 423 err = EPERM; 424 goto oerr; 425 } 426 ef.kernel = 1; 427 428 } else if (ehdr->e_type == ET_DYN) { 429 /* Looks like a kld module */ 430 if (multiboot != 0) { 431 printf("elf" __XSTRING(__ELF_WORD_SIZE) 432 "_loadfile: can't load module as multiboot\n"); 433 err = EPERM; 434 goto oerr; 435 } 436 if (kfp == NULL) { 437 printf("elf" __XSTRING(__ELF_WORD_SIZE) 438 "_loadfile: can't load module before kernel\n"); 439 err = EPERM; 440 goto oerr; 441 } 442 if (strcmp(__elfN(kerneltype), kfp->f_type)) { 443 printf("elf" __XSTRING(__ELF_WORD_SIZE) 444 "_loadfile: can't load module with kernel type '%s'\n", 445 kfp->f_type); 446 err = EPERM; 447 goto oerr; 448 } 449 /* Looks OK, got ahead */ 450 ef.kernel = 0; 451 452 } else { 453 err = EFTYPE; 454 goto oerr; 455 } 456 457 if (archsw.arch_loadaddr != NULL) 458 dest = archsw.arch_loadaddr(LOAD_ELF, ehdr, dest); 459 else 460 dest = roundup(dest, PAGE_SIZE); 461 462 /* 463 * Ok, we think we should handle this. 464 */ 465 fp = file_alloc(); 466 if (fp == NULL) { 467 printf("elf" __XSTRING(__ELF_WORD_SIZE) 468 "_loadfile: cannot allocate module info\n"); 469 err = EPERM; 470 goto out; 471 } 472 if (ef.kernel == 1 && multiboot == 0) 473 setenv("kernelname", filename, 1); 474 fp->f_name = strdup(filename); 475 if (multiboot == 0) 476 fp->f_type = strdup(ef.kernel ? 477 __elfN(kerneltype) : __elfN(moduletype)); 478 else 479 fp->f_type = strdup("elf multiboot kernel"); 480 481 if (module_verbose >= MODULE_VERBOSE_FULL) { 482 if (ef.kernel) 483 printf("%s entry at 0x%jx\n", filename, 484 (uintmax_t)ehdr->e_entry); 485 } else if (module_verbose > MODULE_VERBOSE_SILENT) 486 printf("%s ", filename); 487 488 fp->f_size = __elfN(loadimage)(fp, &ef, dest); 489 if (fp->f_size == 0 || fp->f_addr == 0) 490 goto ioerr; 491 492 /* save exec header as metadata */ 493 file_addmetadata(fp, MODINFOMD_ELFHDR, sizeof(*ehdr), ehdr); 494 495 /* Load OK, return module pointer */ 496 *result = (struct preloaded_file *)fp; 497 err = 0; 498 #ifdef __amd64__ 499 fp->f_kernphys_relocatable = multiboot || is_kernphys_relocatable(&ef); 500 #endif 501 #ifdef __i386__ 502 fp->f_tg_kernel_support = is_tg_kernel_support(fp, &ef); 503 #endif 504 goto out; 505 506 ioerr: 507 err = EIO; 508 oerr: 509 file_discard(fp); 510 out: 511 if (ef.firstpage) 512 free(ef.firstpage); 513 if (ef.fd != -1) { 514 #ifdef LOADER_VERIEXEC_VECTX 515 if (!err && ef.vctx) { 516 int verror; 517 518 verror = vectx_close(ef.vctx, VE_MUST, __func__); 519 if (verror) { 520 err = EAUTH; 521 file_discard(fp); 522 } 523 } 524 #endif 525 close(ef.fd); 526 } 527 return (err); 528 } 529 530 /* 531 * With the file (fd) open on the image, and (ehdr) containing 532 * the Elf header, load the image at (off) 533 */ 534 static int 535 __elfN(loadimage)(struct preloaded_file *fp, elf_file_t ef, uint64_t off) 536 { 537 int i; 538 u_int j; 539 Elf_Ehdr *ehdr; 540 Elf_Phdr *phdr, *php; 541 Elf_Shdr *shdr; 542 char *shstr; 543 int ret; 544 vm_offset_t firstaddr; 545 vm_offset_t lastaddr; 546 size_t chunk; 547 ssize_t result; 548 Elf_Addr ssym, esym; 549 Elf_Dyn *dp; 550 Elf_Addr adp; 551 Elf_Addr ctors; 552 int ndp; 553 int symstrindex; 554 int symtabindex; 555 Elf_Size size; 556 u_int fpcopy; 557 Elf_Sym sym; 558 Elf_Addr p_start, p_end; 559 560 dp = NULL; 561 shdr = NULL; 562 ret = 0; 563 firstaddr = lastaddr = 0; 564 ehdr = ef->ehdr; 565 #ifdef __powerpc__ 566 if (ef->kernel) { 567 #else 568 if (ehdr->e_type == ET_EXEC) { 569 #endif 570 #if defined(__i386__) || defined(__amd64__) 571 #if __ELF_WORD_SIZE == 64 572 /* x86_64 relocates after locore */ 573 off = - (off & 0xffffffffff000000ull); 574 #else 575 /* i386 relocates after locore */ 576 off = - (off & 0xff000000u); 577 #endif 578 #elif defined(__powerpc__) 579 /* 580 * On the purely virtual memory machines like e500, the kernel 581 * is linked against its final VA range, which is most often 582 * not available at the loader stage, but only after kernel 583 * initializes and completes its VM settings. In such cases we 584 * cannot use p_vaddr field directly to load ELF segments, but 585 * put them at some 'load-time' locations. 586 */ 587 if (off & 0xf0000000u) { 588 off = -(off & 0xf0000000u); 589 /* 590 * XXX the physical load address should not be 591 * hardcoded. Note that the Book-E kernel assumes that 592 * it's loaded at a 16MB boundary for now... 593 */ 594 off += 0x01000000; 595 } 596 ehdr->e_entry += off; 597 if (module_verbose >= MODULE_VERBOSE_FULL) 598 printf("Converted entry 0x%jx\n", 599 (uintmax_t)ehdr->e_entry); 600 601 #elif defined(__arm__) && !defined(EFI) 602 /* 603 * The elf headers in arm kernels specify virtual addresses in 604 * all header fields, even the ones that should be physical 605 * addresses. We assume the entry point is in the first page, 606 * and masking the page offset will leave us with the virtual 607 * address the kernel was linked at. We subtract that from the 608 * load offset, making 'off' into the value which, when added 609 * to a virtual address in an elf header, translates it to a 610 * physical address. We do the va->pa conversion on the entry 611 * point address in the header now, so that later we can launch 612 * the kernel by just jumping to that address. 613 * 614 * When booting from UEFI the copyin and copyout functions 615 * handle adjusting the location relative to the first virtual 616 * address. Because of this there is no need to adjust the 617 * offset or entry point address as these will both be handled 618 * by the efi code. 619 */ 620 off -= ehdr->e_entry & ~PAGE_MASK; 621 ehdr->e_entry += off; 622 if (module_verbose >= MODULE_VERBOSE_FULL) 623 printf("ehdr->e_entry 0x%jx, va<->pa off %llx\n", 624 (uintmax_t)ehdr->e_entry, off); 625 #else 626 off = 0; /* other archs use direct mapped kernels */ 627 #endif 628 } 629 ef->off = off; 630 631 if (ef->kernel) 632 __elfN(relocation_offset) = off; 633 634 if ((ehdr->e_phoff + ehdr->e_phnum * sizeof(*phdr)) > ef->firstlen) { 635 printf("elf" __XSTRING(__ELF_WORD_SIZE) 636 "_loadimage: program header not within first page\n"); 637 goto out; 638 } 639 phdr = (Elf_Phdr *)(ef->firstpage + ehdr->e_phoff); 640 641 for (i = 0; i < ehdr->e_phnum; i++) { 642 if (elf_program_header_convert(ehdr, phdr)) 643 continue; 644 645 /* We want to load PT_LOAD segments only.. */ 646 if (phdr[i].p_type != PT_LOAD) 647 continue; 648 649 if (module_verbose >= MODULE_VERBOSE_FULL) { 650 printf("Segment: 0x%lx@0x%lx -> 0x%lx-0x%lx", 651 (long)phdr[i].p_filesz, (long)phdr[i].p_offset, 652 (long)(phdr[i].p_vaddr + off), 653 (long)(phdr[i].p_vaddr + off + phdr[i].p_memsz - 1)); 654 } else if (module_verbose > MODULE_VERBOSE_SILENT) { 655 if ((phdr[i].p_flags & PF_W) == 0) { 656 printf("text=0x%lx ", (long)phdr[i].p_filesz); 657 } else { 658 printf("data=0x%lx", (long)phdr[i].p_filesz); 659 if (phdr[i].p_filesz < phdr[i].p_memsz) 660 printf("+0x%lx", (long)(phdr[i].p_memsz - 661 phdr[i].p_filesz)); 662 printf(" "); 663 } 664 } 665 fpcopy = 0; 666 if (ef->firstlen > phdr[i].p_offset) { 667 fpcopy = ef->firstlen - phdr[i].p_offset; 668 archsw.arch_copyin(ef->firstpage + phdr[i].p_offset, 669 phdr[i].p_vaddr + off, fpcopy); 670 } 671 if (phdr[i].p_filesz > fpcopy) { 672 if (kern_pread(VECTX_HANDLE(ef), 673 phdr[i].p_vaddr + off + fpcopy, 674 phdr[i].p_filesz - fpcopy, 675 phdr[i].p_offset + fpcopy) != 0) { 676 printf("\nelf" __XSTRING(__ELF_WORD_SIZE) 677 "_loadimage: read failed\n"); 678 goto out; 679 } 680 } 681 /* clear space from oversized segments; eg: bss */ 682 if (phdr[i].p_filesz < phdr[i].p_memsz) { 683 if (module_verbose >= MODULE_VERBOSE_FULL) { 684 printf(" (bss: 0x%lx-0x%lx)", 685 (long)(phdr[i].p_vaddr + off + phdr[i].p_filesz), 686 (long)(phdr[i].p_vaddr + off + phdr[i].p_memsz -1)); 687 } 688 kern_bzero(phdr[i].p_vaddr + off + phdr[i].p_filesz, 689 phdr[i].p_memsz - phdr[i].p_filesz); 690 } 691 if (module_verbose >= MODULE_VERBOSE_FULL) 692 printf("\n"); 693 694 if (archsw.arch_loadseg != NULL) 695 archsw.arch_loadseg(ehdr, phdr + i, off); 696 697 if (firstaddr == 0 || firstaddr > (phdr[i].p_vaddr + off)) 698 firstaddr = phdr[i].p_vaddr + off; 699 if (lastaddr == 0 || lastaddr < 700 (phdr[i].p_vaddr + off + phdr[i].p_memsz)) 701 lastaddr = phdr[i].p_vaddr + off + phdr[i].p_memsz; 702 } 703 lastaddr = roundup(lastaddr, sizeof(long)); 704 705 /* 706 * Get the section headers. We need this for finding the .ctors 707 * section as well as for loading any symbols. Both may be hard 708 * to do if reading from a .gz file as it involves seeking. I 709 * think the rule is going to have to be that you must strip a 710 * file to remove symbols before gzipping it. 711 */ 712 chunk = (size_t)ehdr->e_shnum * (size_t)ehdr->e_shentsize; 713 if (chunk == 0 || ehdr->e_shoff == 0) 714 goto nosyms; 715 shdr = alloc_pread(VECTX_HANDLE(ef), ehdr->e_shoff, chunk); 716 if (shdr == NULL) { 717 printf("\nelf" __XSTRING(__ELF_WORD_SIZE) 718 "_loadimage: failed to read section headers"); 719 goto nosyms; 720 } 721 722 for (i = 0; i < ehdr->e_shnum; i++) 723 elf_section_header_convert(ehdr, &shdr[i]); 724 725 file_addmetadata(fp, MODINFOMD_SHDR, chunk, shdr); 726 727 /* 728 * Read the section string table and look for the .ctors section. 729 * We need to tell the kernel where it is so that it can call the 730 * ctors. 731 */ 732 chunk = shdr[ehdr->e_shstrndx].sh_size; 733 if (chunk) { 734 shstr = alloc_pread(VECTX_HANDLE(ef), 735 shdr[ehdr->e_shstrndx].sh_offset, chunk); 736 if (shstr) { 737 for (i = 0; i < ehdr->e_shnum; i++) { 738 if (strcmp(shstr + shdr[i].sh_name, 739 ".ctors") != 0) 740 continue; 741 ctors = shdr[i].sh_addr; 742 file_addmetadata(fp, MODINFOMD_CTORS_ADDR, 743 sizeof(ctors), &ctors); 744 size = shdr[i].sh_size; 745 file_addmetadata(fp, MODINFOMD_CTORS_SIZE, 746 sizeof(size), &size); 747 break; 748 } 749 free(shstr); 750 } 751 } 752 753 /* 754 * Now load any symbols. 755 */ 756 symtabindex = -1; 757 symstrindex = -1; 758 for (i = 0; i < ehdr->e_shnum; i++) { 759 if (shdr[i].sh_type != SHT_SYMTAB) 760 continue; 761 for (j = 0; j < ehdr->e_phnum; j++) { 762 if (phdr[j].p_type != PT_LOAD) 763 continue; 764 if (shdr[i].sh_offset >= phdr[j].p_offset && 765 (shdr[i].sh_offset + shdr[i].sh_size <= 766 phdr[j].p_offset + phdr[j].p_filesz)) { 767 shdr[i].sh_offset = 0; 768 shdr[i].sh_size = 0; 769 break; 770 } 771 } 772 if (shdr[i].sh_offset == 0 || shdr[i].sh_size == 0) 773 continue; /* alread loaded in a PT_LOAD above */ 774 /* Save it for loading below */ 775 symtabindex = i; 776 symstrindex = shdr[i].sh_link; 777 } 778 if (symtabindex < 0 || symstrindex < 0) 779 goto nosyms; 780 781 /* Ok, committed to a load. */ 782 if (module_verbose >= MODULE_VERBOSE_FULL) 783 printf("syms=["); 784 ssym = lastaddr; 785 for (i = symtabindex; i >= 0; i = symstrindex) { 786 char *secname; 787 788 switch(shdr[i].sh_type) { 789 case SHT_SYMTAB: /* Symbol table */ 790 secname = "symtab"; 791 break; 792 case SHT_STRTAB: /* String table */ 793 secname = "strtab"; 794 break; 795 default: 796 secname = "WHOA!!"; 797 break; 798 } 799 size = shdr[i].sh_size; 800 801 archsw.arch_copyin(&size, lastaddr, sizeof(size)); 802 lastaddr += sizeof(size); 803 804 if (module_verbose >= MODULE_VERBOSE_FULL) { 805 printf("\n%s: 0x%jx@0x%jx -> 0x%jx-0x%jx", secname, 806 (uintmax_t)shdr[i].sh_size, (uintmax_t)shdr[i].sh_offset, 807 (uintmax_t)lastaddr, 808 (uintmax_t)(lastaddr + shdr[i].sh_size)); 809 } else if (module_verbose > MODULE_VERBOSE_SILENT) { 810 if (i == symstrindex) 811 printf("+"); 812 printf("0x%lx+0x%lx", (long)sizeof(size), (long)size); 813 } 814 if (VECTX_LSEEK(VECTX_HANDLE(ef), (off_t)shdr[i].sh_offset, SEEK_SET) == -1) { 815 printf("\nelf" __XSTRING(__ELF_WORD_SIZE) 816 "_loadimage: could not seek for symbols - skipped!"); 817 lastaddr = ssym; 818 ssym = 0; 819 goto nosyms; 820 } 821 result = archsw.arch_readin(VECTX_HANDLE(ef), lastaddr, shdr[i].sh_size); 822 if (result < 0 || (size_t)result != shdr[i].sh_size) { 823 printf("\nelf" __XSTRING(__ELF_WORD_SIZE) 824 "_loadimage: could not read symbols - skipped! " 825 "(%ju != %ju)", (uintmax_t)result, 826 (uintmax_t)shdr[i].sh_size); 827 lastaddr = ssym; 828 ssym = 0; 829 goto nosyms; 830 } 831 /* Reset offsets relative to ssym */ 832 lastaddr += shdr[i].sh_size; 833 lastaddr = roundup(lastaddr, sizeof(size)); 834 if (i == symtabindex) 835 symtabindex = -1; 836 else if (i == symstrindex) 837 symstrindex = -1; 838 } 839 esym = lastaddr; 840 if (module_verbose >= MODULE_VERBOSE_FULL) 841 printf("]"); 842 843 file_addmetadata(fp, MODINFOMD_SSYM, sizeof(ssym), &ssym); 844 file_addmetadata(fp, MODINFOMD_ESYM, sizeof(esym), &esym); 845 846 nosyms: 847 if (module_verbose > MODULE_VERBOSE_SILENT) 848 printf("\n"); 849 850 ret = lastaddr - firstaddr; 851 fp->f_addr = firstaddr; 852 853 php = NULL; 854 for (i = 0; i < ehdr->e_phnum; i++) { 855 if (phdr[i].p_type == PT_DYNAMIC) { 856 php = phdr + i; 857 adp = php->p_vaddr; 858 file_addmetadata(fp, MODINFOMD_DYNAMIC, sizeof(adp), 859 &adp); 860 break; 861 } 862 } 863 864 if (php == NULL) /* this is bad, we cannot get to symbols or _DYNAMIC */ 865 goto out; 866 867 ndp = php->p_filesz / sizeof(Elf_Dyn); 868 if (ndp == 0) 869 goto out; 870 dp = malloc(php->p_filesz); 871 if (dp == NULL) 872 goto out; 873 archsw.arch_copyout(php->p_vaddr + off, dp, php->p_filesz); 874 875 ef->strsz = 0; 876 for (i = 0; i < ndp; i++) { 877 if (dp[i].d_tag == 0) 878 break; 879 switch (dp[i].d_tag) { 880 case DT_HASH: 881 ef->hashtab = 882 (Elf_Hashelt*)(uintptr_t)(dp[i].d_un.d_ptr + off); 883 break; 884 case DT_STRTAB: 885 ef->strtab = 886 (char *)(uintptr_t)(dp[i].d_un.d_ptr + off); 887 break; 888 case DT_STRSZ: 889 ef->strsz = dp[i].d_un.d_val; 890 break; 891 case DT_SYMTAB: 892 ef->symtab = 893 (Elf_Sym *)(uintptr_t)(dp[i].d_un.d_ptr + off); 894 break; 895 case DT_REL: 896 ef->rel = 897 (Elf_Rel *)(uintptr_t)(dp[i].d_un.d_ptr + off); 898 break; 899 case DT_RELSZ: 900 ef->relsz = dp[i].d_un.d_val; 901 break; 902 case DT_RELA: 903 ef->rela = 904 (Elf_Rela *)(uintptr_t)(dp[i].d_un.d_ptr + off); 905 break; 906 case DT_RELASZ: 907 ef->relasz = dp[i].d_un.d_val; 908 break; 909 default: 910 break; 911 } 912 } 913 if (ef->hashtab == NULL || ef->symtab == NULL || 914 ef->strtab == NULL || ef->strsz == 0) 915 goto out; 916 COPYOUT(ef->hashtab, &ef->nbuckets, sizeof(ef->nbuckets)); 917 COPYOUT(ef->hashtab + 1, &ef->nchains, sizeof(ef->nchains)); 918 ef->buckets = ef->hashtab + 2; 919 ef->chains = ef->buckets + ef->nbuckets; 920 921 if (__elfN(lookup_symbol)(ef, "__start_set_modmetadata_set", &sym, 922 STT_NOTYPE) != 0) 923 return 0; 924 p_start = sym.st_value + ef->off; 925 if (__elfN(lookup_symbol)(ef, "__stop_set_modmetadata_set", &sym, 926 STT_NOTYPE) != 0) 927 return 0; 928 p_end = sym.st_value + ef->off; 929 930 if (__elfN(parse_modmetadata)(fp, ef, p_start, p_end) == 0) 931 goto out; 932 933 if (ef->kernel) /* kernel must not depend on anything */ 934 goto out; 935 936 out: 937 if (dp) 938 free(dp); 939 if (shdr) 940 free(shdr); 941 return ret; 942 } 943 944 static char invalid_name[] = "bad"; 945 946 char * 947 fake_modname(const char *name) 948 { 949 const char *sp, *ep; 950 char *fp; 951 size_t len; 952 953 sp = strrchr(name, '/'); 954 if (sp) 955 sp++; 956 else 957 sp = name; 958 959 ep = strrchr(sp, '.'); 960 if (ep == NULL) { 961 ep = sp + strlen(sp); 962 } 963 if (ep == sp) { 964 sp = invalid_name; 965 ep = invalid_name + sizeof(invalid_name) - 1; 966 } 967 968 len = ep - sp; 969 fp = malloc(len + 1); 970 if (fp == NULL) 971 return NULL; 972 memcpy(fp, sp, len); 973 fp[len] = '\0'; 974 return fp; 975 } 976 977 #if (defined(__i386__) || defined(__powerpc__)) && __ELF_WORD_SIZE == 64 978 struct mod_metadata64 { 979 int md_version; /* structure version MDTV_* */ 980 int md_type; /* type of entry MDT_* */ 981 uint64_t md_data; /* specific data */ 982 uint64_t md_cval; /* common string label */ 983 }; 984 #endif 985 #if defined(__amd64__) && __ELF_WORD_SIZE == 32 986 struct mod_metadata32 { 987 int md_version; /* structure version MDTV_* */ 988 int md_type; /* type of entry MDT_* */ 989 uint32_t md_data; /* specific data */ 990 uint32_t md_cval; /* common string label */ 991 }; 992 #endif 993 994 int 995 __elfN(load_modmetadata)(struct preloaded_file *fp, uint64_t dest) 996 { 997 struct elf_file ef; 998 int err, i, j; 999 Elf_Shdr *sh_meta, *shdr = NULL; 1000 Elf_Shdr *sh_data[2]; 1001 char *shstrtab = NULL; 1002 size_t size; 1003 Elf_Addr p_start, p_end; 1004 1005 bzero(&ef, sizeof(struct elf_file)); 1006 ef.fd = -1; 1007 1008 err = __elfN(load_elf_header)(fp->f_name, &ef); 1009 if (err != 0) 1010 goto out; 1011 1012 if (ef.kernel == 1 || ef.ehdr->e_type == ET_EXEC) { 1013 ef.kernel = 1; 1014 } else if (ef.ehdr->e_type != ET_DYN) { 1015 err = EFTYPE; 1016 goto out; 1017 } 1018 1019 size = (size_t)ef.ehdr->e_shnum * (size_t)ef.ehdr->e_shentsize; 1020 shdr = alloc_pread(VECTX_HANDLE(&ef), ef.ehdr->e_shoff, size); 1021 if (shdr == NULL) { 1022 err = ENOMEM; 1023 goto out; 1024 } 1025 1026 /* Load shstrtab. */ 1027 shstrtab = alloc_pread(VECTX_HANDLE(&ef), shdr[ef.ehdr->e_shstrndx].sh_offset, 1028 shdr[ef.ehdr->e_shstrndx].sh_size); 1029 if (shstrtab == NULL) { 1030 printf("\nelf" __XSTRING(__ELF_WORD_SIZE) 1031 "load_modmetadata: unable to load shstrtab\n"); 1032 err = EFTYPE; 1033 goto out; 1034 } 1035 1036 /* Find set_modmetadata_set and data sections. */ 1037 sh_data[0] = sh_data[1] = sh_meta = NULL; 1038 for (i = 0, j = 0; i < ef.ehdr->e_shnum; i++) { 1039 if (strcmp(&shstrtab[shdr[i].sh_name], 1040 "set_modmetadata_set") == 0) { 1041 sh_meta = &shdr[i]; 1042 } 1043 if ((strcmp(&shstrtab[shdr[i].sh_name], ".data") == 0) || 1044 (strcmp(&shstrtab[shdr[i].sh_name], ".rodata") == 0)) { 1045 sh_data[j++] = &shdr[i]; 1046 } 1047 } 1048 if (sh_meta == NULL || sh_data[0] == NULL || sh_data[1] == NULL) { 1049 printf("\nelf" __XSTRING(__ELF_WORD_SIZE) 1050 "load_modmetadata: unable to find set_modmetadata_set or data sections\n"); 1051 err = EFTYPE; 1052 goto out; 1053 } 1054 1055 /* Load set_modmetadata_set into memory */ 1056 err = kern_pread(VECTX_HANDLE(&ef), dest, sh_meta->sh_size, sh_meta->sh_offset); 1057 if (err != 0) { 1058 printf("\nelf" __XSTRING(__ELF_WORD_SIZE) 1059 "load_modmetadata: unable to load set_modmetadata_set: %d\n", err); 1060 goto out; 1061 } 1062 p_start = dest; 1063 p_end = dest + sh_meta->sh_size; 1064 dest += sh_meta->sh_size; 1065 1066 /* Load data sections into memory. */ 1067 err = kern_pread(VECTX_HANDLE(&ef), dest, sh_data[0]->sh_size, 1068 sh_data[0]->sh_offset); 1069 if (err != 0) { 1070 printf("\nelf" __XSTRING(__ELF_WORD_SIZE) 1071 "load_modmetadata: unable to load data: %d\n", err); 1072 goto out; 1073 } 1074 1075 /* 1076 * We have to increment the dest, so that the offset is the same into 1077 * both the .rodata and .data sections. 1078 */ 1079 ef.off = -(sh_data[0]->sh_addr - dest); 1080 dest += (sh_data[1]->sh_addr - sh_data[0]->sh_addr); 1081 1082 err = kern_pread(VECTX_HANDLE(&ef), dest, sh_data[1]->sh_size, 1083 sh_data[1]->sh_offset); 1084 if (err != 0) { 1085 printf("\nelf" __XSTRING(__ELF_WORD_SIZE) 1086 "load_modmetadata: unable to load data: %d\n", err); 1087 goto out; 1088 } 1089 1090 err = __elfN(parse_modmetadata)(fp, &ef, p_start, p_end); 1091 if (err != 0) { 1092 printf("\nelf" __XSTRING(__ELF_WORD_SIZE) 1093 "load_modmetadata: unable to parse metadata: %d\n", err); 1094 goto out; 1095 } 1096 1097 out: 1098 if (shstrtab != NULL) 1099 free(shstrtab); 1100 if (shdr != NULL) 1101 free(shdr); 1102 if (ef.firstpage != NULL) 1103 free(ef.firstpage); 1104 if (ef.fd != -1) { 1105 #ifdef LOADER_VERIEXEC_VECTX 1106 if (!err && ef.vctx) { 1107 int verror; 1108 1109 verror = vectx_close(ef.vctx, VE_MUST, __func__); 1110 if (verror) { 1111 err = EAUTH; 1112 file_discard(fp); 1113 } 1114 } 1115 #endif 1116 close(ef.fd); 1117 } 1118 return (err); 1119 } 1120 1121 int 1122 __elfN(parse_modmetadata)(struct preloaded_file *fp, elf_file_t ef, 1123 Elf_Addr p_start, Elf_Addr p_end) 1124 { 1125 struct mod_metadata md; 1126 #if (defined(__i386__) || defined(__powerpc__)) && __ELF_WORD_SIZE == 64 1127 struct mod_metadata64 md64; 1128 #elif defined(__amd64__) && __ELF_WORD_SIZE == 32 1129 struct mod_metadata32 md32; 1130 #endif 1131 struct mod_depend *mdepend; 1132 struct mod_version mver; 1133 char *s; 1134 int error, modcnt, minfolen; 1135 Elf_Addr v, p; 1136 1137 modcnt = 0; 1138 p = p_start; 1139 while (p < p_end) { 1140 COPYOUT(p, &v, sizeof(v)); 1141 error = __elfN(reloc_ptr)(fp, ef, p, &v, sizeof(v)); 1142 if (error == EOPNOTSUPP) 1143 v += ef->off; 1144 else if (error != 0) 1145 return (error); 1146 #if (defined(__i386__) || defined(__powerpc__)) && __ELF_WORD_SIZE == 64 1147 COPYOUT(v, &md64, sizeof(md64)); 1148 error = __elfN(reloc_ptr)(fp, ef, v, &md64, sizeof(md64)); 1149 if (error == EOPNOTSUPP) { 1150 md64.md_cval += ef->off; 1151 md64.md_data += ef->off; 1152 } else if (error != 0) 1153 return (error); 1154 md.md_version = md64.md_version; 1155 md.md_type = md64.md_type; 1156 md.md_cval = (const char *)(uintptr_t)md64.md_cval; 1157 md.md_data = (void *)(uintptr_t)md64.md_data; 1158 #elif defined(__amd64__) && __ELF_WORD_SIZE == 32 1159 COPYOUT(v, &md32, sizeof(md32)); 1160 error = __elfN(reloc_ptr)(fp, ef, v, &md32, sizeof(md32)); 1161 if (error == EOPNOTSUPP) { 1162 md32.md_cval += ef->off; 1163 md32.md_data += ef->off; 1164 } else if (error != 0) 1165 return (error); 1166 md.md_version = md32.md_version; 1167 md.md_type = md32.md_type; 1168 md.md_cval = (const char *)(uintptr_t)md32.md_cval; 1169 md.md_data = (void *)(uintptr_t)md32.md_data; 1170 #else 1171 COPYOUT(v, &md, sizeof(md)); 1172 error = __elfN(reloc_ptr)(fp, ef, v, &md, sizeof(md)); 1173 if (error == EOPNOTSUPP) { 1174 md.md_cval += ef->off; 1175 md.md_data = (void *)((uintptr_t)md.md_data + 1176 (uintptr_t)ef->off); 1177 } else if (error != 0) 1178 return (error); 1179 #endif 1180 p += sizeof(Elf_Addr); 1181 switch(md.md_type) { 1182 case MDT_DEPEND: 1183 if (ef->kernel) /* kernel must not depend on anything */ 1184 break; 1185 s = strdupout((vm_offset_t)md.md_cval); 1186 minfolen = sizeof(*mdepend) + strlen(s) + 1; 1187 mdepend = malloc(minfolen); 1188 if (mdepend == NULL) 1189 return ENOMEM; 1190 COPYOUT((vm_offset_t)md.md_data, mdepend, 1191 sizeof(*mdepend)); 1192 strcpy((char*)(mdepend + 1), s); 1193 free(s); 1194 file_addmetadata(fp, MODINFOMD_DEPLIST, minfolen, 1195 mdepend); 1196 free(mdepend); 1197 break; 1198 case MDT_VERSION: 1199 s = strdupout((vm_offset_t)md.md_cval); 1200 COPYOUT((vm_offset_t)md.md_data, &mver, sizeof(mver)); 1201 file_addmodule(fp, s, mver.mv_version, NULL); 1202 free(s); 1203 modcnt++; 1204 break; 1205 } 1206 } 1207 if (modcnt == 0) { 1208 s = fake_modname(fp->f_name); 1209 file_addmodule(fp, s, 1, NULL); 1210 free(s); 1211 } 1212 return 0; 1213 } 1214 1215 static unsigned long 1216 elf_hash(const char *name) 1217 { 1218 const unsigned char *p = (const unsigned char *) name; 1219 unsigned long h = 0; 1220 unsigned long g; 1221 1222 while (*p != '\0') { 1223 h = (h << 4) + *p++; 1224 if ((g = h & 0xf0000000) != 0) 1225 h ^= g >> 24; 1226 h &= ~g; 1227 } 1228 return h; 1229 } 1230 1231 static const char __elfN(bad_symtable)[] = "elf" __XSTRING(__ELF_WORD_SIZE) 1232 "_lookup_symbol: corrupt symbol table\n"; 1233 int 1234 __elfN(lookup_symbol)(elf_file_t ef, const char* name, Elf_Sym *symp, 1235 unsigned char type) 1236 { 1237 Elf_Hashelt symnum; 1238 Elf_Sym sym; 1239 char *strp; 1240 unsigned long hash; 1241 1242 if (ef->nbuckets == 0) { 1243 printf(__elfN(bad_symtable)); 1244 return ENOENT; 1245 } 1246 1247 hash = elf_hash(name); 1248 COPYOUT(&ef->buckets[hash % ef->nbuckets], &symnum, sizeof(symnum)); 1249 1250 while (symnum != STN_UNDEF) { 1251 if (symnum >= ef->nchains) { 1252 printf(__elfN(bad_symtable)); 1253 return ENOENT; 1254 } 1255 1256 COPYOUT(ef->symtab + symnum, &sym, sizeof(sym)); 1257 if (sym.st_name == 0) { 1258 printf(__elfN(bad_symtable)); 1259 return ENOENT; 1260 } 1261 1262 strp = strdupout((vm_offset_t)(ef->strtab + sym.st_name)); 1263 if (strcmp(name, strp) == 0) { 1264 free(strp); 1265 if (sym.st_shndx != SHN_UNDEF && sym.st_value != 0 && 1266 ELF_ST_TYPE(sym.st_info) == type) { 1267 *symp = sym; 1268 return 0; 1269 } 1270 return ENOENT; 1271 } 1272 free(strp); 1273 COPYOUT(&ef->chains[symnum], &symnum, sizeof(symnum)); 1274 } 1275 return ENOENT; 1276 } 1277 1278 /* 1279 * Apply any intra-module relocations to the value. p is the load address 1280 * of the value and val/len is the value to be modified. This does NOT modify 1281 * the image in-place, because this is done by kern_linker later on. 1282 * 1283 * Returns EOPNOTSUPP if no relocation method is supplied. 1284 */ 1285 static int 1286 __elfN(reloc_ptr)(struct preloaded_file *mp, elf_file_t ef, 1287 Elf_Addr p, void *val, size_t len) 1288 { 1289 size_t n; 1290 Elf_Rela a; 1291 Elf_Rel r; 1292 int error; 1293 1294 /* 1295 * The kernel is already relocated, but we still want to apply 1296 * offset adjustments. 1297 */ 1298 if (ef->kernel) 1299 return (EOPNOTSUPP); 1300 1301 for (n = 0; n < ef->relsz / sizeof(r); n++) { 1302 COPYOUT(ef->rel + n, &r, sizeof(r)); 1303 1304 error = __elfN(reloc)(ef, __elfN(symaddr), &r, ELF_RELOC_REL, 1305 ef->off, p, val, len); 1306 if (error != 0) 1307 return (error); 1308 } 1309 for (n = 0; n < ef->relasz / sizeof(a); n++) { 1310 COPYOUT(ef->rela + n, &a, sizeof(a)); 1311 1312 error = __elfN(reloc)(ef, __elfN(symaddr), &a, ELF_RELOC_RELA, 1313 ef->off, p, val, len); 1314 if (error != 0) 1315 return (error); 1316 } 1317 1318 return (0); 1319 } 1320 1321 static Elf_Addr 1322 __elfN(symaddr)(struct elf_file *ef, Elf_Size symidx) 1323 { 1324 1325 /* Symbol lookup by index not required here. */ 1326 return (0); 1327 } 1328