Ulrich Drepper | b08d5a8 | 2005-07-26 05:00:05 +0000 | [diff] [blame^] | 1 | /* Pedantic checking of ELF files compliance with gABI/psABI spec. |
| 2 | Copyright (C) 2001, 2002, 2003, 2004, 2005 Red Hat, Inc. |
| 3 | Written by Ulrich Drepper <drepper@redhat.com>, 2001. |
| 4 | |
| 5 | This program is Open Source software; you can redistribute it and/or |
| 6 | modify it under the terms of the Open Software License version 1.0 as |
| 7 | published by the Open Source Initiative. |
| 8 | |
| 9 | You should have received a copy of the Open Software License along |
| 10 | with this program; if not, you may obtain a copy of the Open Software |
| 11 | License version 1.0 from http://www.opensource.org/licenses/osl.php or |
| 12 | by writing the Open Source Initiative c/o Lawrence Rosen, Esq., |
| 13 | 3001 King Ranch Road, Ukiah, CA 95482. */ |
| 14 | |
| 15 | #ifdef HAVE_CONFIG_H |
| 16 | # include <config.h> |
| 17 | #endif |
| 18 | |
| 19 | #include <argp.h> |
| 20 | #include <assert.h> |
| 21 | #include <byteswap.h> |
| 22 | #include <endian.h> |
| 23 | #include <error.h> |
| 24 | #include <fcntl.h> |
| 25 | #include <gelf.h> |
| 26 | #include <inttypes.h> |
| 27 | #include <libintl.h> |
| 28 | #include <locale.h> |
| 29 | #include <stdbool.h> |
| 30 | #include <stdlib.h> |
| 31 | #include <string.h> |
| 32 | #include <unistd.h> |
| 33 | #include <sys/param.h> |
| 34 | |
| 35 | #include <elf-knowledge.h> |
| 36 | #include <system.h> |
| 37 | #include "../libebl/libeblP.h" |
| 38 | |
| 39 | |
| 40 | /* Name and version of program. */ |
| 41 | static void print_version (FILE *stream, struct argp_state *state); |
| 42 | void (*argp_program_version_hook) (FILE *, struct argp_state *) = print_version; |
| 43 | |
| 44 | /* Bug report address. */ |
| 45 | const char *argp_program_bug_address = PACKAGE_BUGREPORT; |
| 46 | |
| 47 | #define ARGP_strict 300 |
| 48 | #define ARGP_gnuld 301 |
| 49 | |
| 50 | /* Definitions of arguments for argp functions. */ |
| 51 | static const struct argp_option options[] = |
| 52 | { |
| 53 | |
| 54 | { "strict", ARGP_strict, NULL, 0, |
| 55 | N_("Be extremely strict, flag level 2 features."), 0 }, |
| 56 | { "quiet", 'q', NULL, 0, N_("Do not print anything if successful"), 0 }, |
| 57 | { "debuginfo", 'd', NULL, 0, N_("Binary is a separate debuginfo file"), 0 }, |
| 58 | { "gnu-ld", ARGP_gnuld, NULL, 0, |
| 59 | N_("Binary has been created with GNU ld and is therefore known to be \ |
| 60 | broken in certain ways"), 0 }, |
| 61 | { NULL, 0, NULL, 0, NULL, 0 } |
| 62 | }; |
| 63 | |
| 64 | /* Short description of program. */ |
| 65 | static const char doc[] = N_("\ |
| 66 | Pedantic checking of ELF files compliance with gABI/psABI spec."); |
| 67 | |
| 68 | /* Strings for arguments in help texts. */ |
| 69 | static const char args_doc[] = N_("FILE..."); |
| 70 | |
| 71 | /* Prototype for option handler. */ |
| 72 | static error_t parse_opt (int key, char *arg, struct argp_state *state); |
| 73 | |
| 74 | /* Data structure to communicate with argp functions. */ |
| 75 | static struct argp argp = |
| 76 | { |
| 77 | options, parse_opt, args_doc, doc, NULL, NULL, NULL |
| 78 | }; |
| 79 | |
| 80 | |
| 81 | /* Declarations of local functions. */ |
| 82 | static void process_file (int fd, Elf *elf, const char *prefix, |
| 83 | const char *suffix, const char *fname, size_t size, |
| 84 | bool only_one); |
| 85 | static void process_elf_file (Elf *elf, const char *prefix, const char *suffix, |
| 86 | const char *fname, size_t size, bool only_one); |
| 87 | |
| 88 | /* Report an error. */ |
| 89 | #define ERROR(str, args...) \ |
| 90 | do { \ |
| 91 | printf (str, ##args); \ |
| 92 | ++error_count; \ |
| 93 | } while (0) |
| 94 | static unsigned int error_count; |
| 95 | |
| 96 | /* True if we should perform very strict testing. */ |
| 97 | static bool be_strict; |
| 98 | |
| 99 | /* True if no message is to be printed if the run is succesful. */ |
| 100 | static bool be_quiet; |
| 101 | |
| 102 | /* True if binary is from strip -f, not a normal ELF file. */ |
| 103 | static bool is_debuginfo; |
| 104 | |
| 105 | /* True if binary is assumed to be generated with GNU ld. */ |
| 106 | static bool gnuld; |
| 107 | |
| 108 | /* Index of section header string table. */ |
| 109 | static uint32_t shstrndx; |
| 110 | |
| 111 | /* Array to count references in section groups. */ |
| 112 | static int *scnref; |
| 113 | |
| 114 | |
| 115 | int |
| 116 | main (int argc, char *argv[]) |
| 117 | { |
| 118 | /* Set locale. */ |
| 119 | setlocale (LC_ALL, ""); |
| 120 | |
| 121 | /* Initialize the message catalog. */ |
| 122 | textdomain (PACKAGE); |
| 123 | |
| 124 | /* Parse and process arguments. */ |
| 125 | int remaining; |
| 126 | argp_parse (&argp, argc, argv, 0, &remaining, NULL); |
| 127 | |
| 128 | /* Before we start tell the ELF library which version we are using. */ |
| 129 | elf_version (EV_CURRENT); |
| 130 | |
| 131 | /* Now process all the files given at the command line. */ |
| 132 | bool only_one = remaining + 1 == argc; |
| 133 | do |
| 134 | { |
| 135 | /* Open the file. */ |
| 136 | int fd = open (argv[remaining], O_RDONLY); |
| 137 | if (fd == -1) |
| 138 | { |
| 139 | error (0, errno, gettext ("cannot open input file")); |
| 140 | continue; |
| 141 | } |
| 142 | |
| 143 | /* Create an `Elf' descriptor. */ |
| 144 | Elf *elf = elf_begin (fd, ELF_C_READ_MMAP, NULL); |
| 145 | if (elf == NULL) |
| 146 | ERROR (gettext ("cannot generate Elf descriptor: %s\n"), |
| 147 | elf_errmsg (-1)); |
| 148 | else |
| 149 | { |
| 150 | unsigned int prev_error_count = error_count; |
| 151 | struct stat64 st; |
| 152 | |
| 153 | if (fstat64 (fd, &st) != 0) |
| 154 | { |
| 155 | printf ("cannot stat '%s': %m\n", argv[remaining]); |
| 156 | close (fd); |
| 157 | continue; |
| 158 | } |
| 159 | |
| 160 | process_file (fd, elf, NULL, NULL, argv[remaining], st.st_size, |
| 161 | only_one); |
| 162 | |
| 163 | /* Now we can close the descriptor. */ |
| 164 | if (elf_end (elf) != 0) |
| 165 | ERROR (gettext ("error while closing Elf descriptor: %s\n"), |
| 166 | elf_errmsg (-1)); |
| 167 | |
| 168 | if (prev_error_count == error_count && !be_quiet) |
| 169 | puts (gettext ("No errors")); |
| 170 | } |
| 171 | |
| 172 | close (fd); |
| 173 | } |
| 174 | while (++remaining < argc); |
| 175 | |
| 176 | return error_count != 0; |
| 177 | } |
| 178 | |
| 179 | |
| 180 | /* Handle program arguments. */ |
| 181 | static error_t |
| 182 | parse_opt (int key, char *arg __attribute__ ((unused)), |
| 183 | struct argp_state *state __attribute__ ((unused))) |
| 184 | { |
| 185 | switch (key) |
| 186 | { |
| 187 | case ARGP_strict: |
| 188 | be_strict = true; |
| 189 | break; |
| 190 | |
| 191 | case 'q': |
| 192 | be_quiet = true; |
| 193 | break; |
| 194 | |
| 195 | case 'd': |
| 196 | is_debuginfo = true; |
| 197 | |
| 198 | case ARGP_gnuld: |
| 199 | gnuld = true; |
| 200 | break; |
| 201 | |
| 202 | case ARGP_KEY_NO_ARGS: |
| 203 | fputs (gettext ("Missing file name.\n"), stderr); |
| 204 | argp_help (&argp, stderr, ARGP_HELP_SEE | ARGP_HELP_EXIT_ERR, |
| 205 | program_invocation_short_name); |
| 206 | exit (1); |
| 207 | |
| 208 | default: |
| 209 | return ARGP_ERR_UNKNOWN; |
| 210 | } |
| 211 | return 0; |
| 212 | } |
| 213 | |
| 214 | |
| 215 | /* Print the version information. */ |
| 216 | static void |
| 217 | print_version (FILE *stream, struct argp_state *state __attribute__ ((unused))) |
| 218 | { |
| 219 | fprintf (stream, "elflint (%s) %s\n", PACKAGE_NAME, VERSION); |
| 220 | fprintf (stream, gettext ("\ |
| 221 | Copyright (C) %s Red Hat, Inc.\n\ |
| 222 | This is free software; see the source for copying conditions. There is NO\n\ |
| 223 | warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.\n\ |
| 224 | "), "2005"); |
| 225 | fprintf (stream, gettext ("Written by %s.\n"), "Ulrich Drepper"); |
| 226 | } |
| 227 | |
| 228 | |
| 229 | /* Process one file. */ |
| 230 | static void |
| 231 | process_file (int fd, Elf *elf, const char *prefix, const char *suffix, |
| 232 | const char *fname, size_t size, bool only_one) |
| 233 | { |
| 234 | /* We can handle two types of files: ELF files and archives. */ |
| 235 | Elf_Kind kind = elf_kind (elf); |
| 236 | |
| 237 | switch (kind) |
| 238 | { |
| 239 | case ELF_K_ELF: |
| 240 | /* Yes! It's an ELF file. */ |
| 241 | process_elf_file (elf, prefix, suffix, fname, size, only_one); |
| 242 | break; |
| 243 | |
| 244 | case ELF_K_AR: |
| 245 | { |
| 246 | Elf *subelf; |
| 247 | Elf_Cmd cmd = ELF_C_READ_MMAP; |
| 248 | size_t prefix_len = prefix == NULL ? 0 : strlen (prefix); |
| 249 | size_t fname_len = strlen (fname) + 1; |
| 250 | char new_prefix[prefix_len + 1 + fname_len]; |
| 251 | char new_suffix[(suffix == NULL ? 0 : strlen (suffix)) + 2]; |
| 252 | char *cp = new_prefix; |
| 253 | |
| 254 | /* Create the full name of the file. */ |
| 255 | if (prefix != NULL) |
| 256 | { |
| 257 | cp = mempcpy (cp, prefix, prefix_len); |
| 258 | *cp++ = '('; |
| 259 | strcpy (stpcpy (new_suffix, suffix), ")"); |
| 260 | } |
| 261 | else |
| 262 | new_suffix[0] = '\0'; |
| 263 | memcpy (cp, fname, fname_len); |
| 264 | |
| 265 | /* It's an archive. We process each file in it. */ |
| 266 | while ((subelf = elf_begin (fd, cmd, elf)) != NULL) |
| 267 | { |
| 268 | kind = elf_kind (subelf); |
| 269 | |
| 270 | /* Call this function recursively. */ |
| 271 | if (kind == ELF_K_ELF || kind == ELF_K_AR) |
| 272 | { |
| 273 | Elf_Arhdr *arhdr = elf_getarhdr (subelf); |
| 274 | assert (arhdr != NULL); |
| 275 | |
| 276 | process_file (fd, subelf, new_prefix, new_suffix, |
| 277 | arhdr->ar_name, arhdr->ar_size, false); |
| 278 | } |
| 279 | |
| 280 | /* Get next archive element. */ |
| 281 | cmd = elf_next (subelf); |
| 282 | if (elf_end (subelf) != 0) |
| 283 | ERROR (gettext (" error while freeing sub-ELF descriptor: %s\n"), |
| 284 | elf_errmsg (-1)); |
| 285 | } |
| 286 | } |
| 287 | break; |
| 288 | |
| 289 | default: |
| 290 | /* We cannot do anything. */ |
| 291 | ERROR (gettext ("\ |
| 292 | Not an ELF file - it has the wrong magic bytes at the start")); |
| 293 | break; |
| 294 | } |
| 295 | } |
| 296 | |
| 297 | |
| 298 | static const char * |
| 299 | section_name (Ebl *ebl, int idx) |
| 300 | { |
| 301 | GElf_Shdr shdr_mem; |
| 302 | GElf_Shdr *shdr; |
| 303 | |
| 304 | shdr = gelf_getshdr (elf_getscn (ebl->elf, idx), &shdr_mem); |
| 305 | |
| 306 | return elf_strptr (ebl->elf, shstrndx, shdr->sh_name); |
| 307 | } |
| 308 | |
| 309 | |
| 310 | static const int valid_e_machine[] = |
| 311 | { |
| 312 | EM_M32, EM_SPARC, EM_386, EM_68K, EM_88K, EM_860, EM_MIPS, EM_S370, |
| 313 | EM_MIPS_RS3_LE, EM_PARISC, EM_VPP500, EM_SPARC32PLUS, EM_960, EM_PPC, |
| 314 | EM_PPC64, EM_S390, EM_V800, EM_FR20, EM_RH32, EM_RCE, EM_ARM, |
| 315 | EM_FAKE_ALPHA, EM_SH, EM_SPARCV9, EM_TRICORE, EM_ARC, EM_H8_300, |
| 316 | EM_H8_300H, EM_H8S, EM_H8_500, EM_IA_64, EM_MIPS_X, EM_COLDFIRE, |
| 317 | EM_68HC12, EM_MMA, EM_PCP, EM_NCPU, EM_NDR1, EM_STARCORE, EM_ME16, |
| 318 | EM_ST100, EM_TINYJ, EM_X86_64, EM_PDSP, EM_FX66, EM_ST9PLUS, EM_ST7, |
| 319 | EM_68HC16, EM_68HC11, EM_68HC08, EM_68HC05, EM_SVX, EM_ST19, EM_VAX, |
| 320 | EM_CRIS, EM_JAVELIN, EM_FIREPATH, EM_ZSP, EM_MMIX, EM_HUANY, EM_PRISM, |
| 321 | EM_AVR, EM_FR30, EM_D10V, EM_D30V, EM_V850, EM_M32R, EM_MN10300, |
| 322 | EM_MN10200, EM_PJ, EM_OPENRISC, EM_ARC_A5, EM_XTENSA |
| 323 | }; |
| 324 | #define nvalid_e_machine \ |
| 325 | (sizeof (valid_e_machine) / sizeof (valid_e_machine[0])) |
| 326 | |
| 327 | |
| 328 | /* Number of sections. */ |
| 329 | static unsigned int shnum; |
| 330 | |
| 331 | |
| 332 | static void |
| 333 | check_elf_header (Ebl *ebl, GElf_Ehdr *ehdr, size_t size) |
| 334 | { |
| 335 | char buf[512]; |
| 336 | size_t cnt; |
| 337 | |
| 338 | /* Check e_ident field. */ |
| 339 | if (ehdr->e_ident[EI_MAG0] != ELFMAG0) |
| 340 | ERROR ("e_ident[%d] != '%c'\n", EI_MAG0, ELFMAG0); |
| 341 | if (ehdr->e_ident[EI_MAG1] != ELFMAG1) |
| 342 | ERROR ("e_ident[%d] != '%c'\n", EI_MAG1, ELFMAG1); |
| 343 | if (ehdr->e_ident[EI_MAG2] != ELFMAG2) |
| 344 | ERROR ("e_ident[%d] != '%c'\n", EI_MAG2, ELFMAG2); |
| 345 | if (ehdr->e_ident[EI_MAG3] != ELFMAG3) |
| 346 | ERROR ("e_ident[%d] != '%c'\n", EI_MAG3, ELFMAG3); |
| 347 | |
| 348 | if (ehdr->e_ident[EI_CLASS] != ELFCLASS32 |
| 349 | && ehdr->e_ident[EI_CLASS] != ELFCLASS64) |
| 350 | ERROR (gettext ("e_ident[%d] == %d is no known class\n"), |
| 351 | EI_CLASS, ehdr->e_ident[EI_CLASS]); |
| 352 | |
| 353 | if (ehdr->e_ident[EI_DATA] != ELFDATA2LSB |
| 354 | && ehdr->e_ident[EI_DATA] != ELFDATA2MSB) |
| 355 | ERROR (gettext ("e_ident[%d] == %d is no known data encoding\n"), |
| 356 | EI_DATA, ehdr->e_ident[EI_DATA]); |
| 357 | |
| 358 | if (ehdr->e_ident[EI_VERSION] != EV_CURRENT) |
| 359 | ERROR (gettext ("unknown ELF header version number e_ident[%d] == %d\n"), |
| 360 | EI_VERSION, ehdr->e_ident[EI_VERSION]); |
| 361 | |
| 362 | /* We currently don't handle any OS ABIs. */ |
| 363 | if (ehdr->e_ident[EI_OSABI] != ELFOSABI_NONE) |
| 364 | ERROR (gettext ("unsupported OS ABI e_ident[%d] == \"%s\"\n"), |
| 365 | EI_OSABI, |
| 366 | ebl_osabi_name (ebl, ehdr->e_ident[EI_OSABI], buf, sizeof (buf))); |
| 367 | |
| 368 | /* No ABI versions other than zero supported either. */ |
| 369 | if (ehdr->e_ident[EI_ABIVERSION] != 0) |
| 370 | ERROR (gettext ("unsupport ABI version e_ident[%d] == %d\n"), |
| 371 | EI_ABIVERSION, ehdr->e_ident[EI_ABIVERSION]); |
| 372 | |
| 373 | for (cnt = EI_PAD; cnt < EI_NIDENT; ++cnt) |
| 374 | if (ehdr->e_ident[cnt] != 0) |
| 375 | ERROR (gettext ("e_ident[%zu] is not zero\n"), cnt); |
| 376 | |
| 377 | /* Check the e_type field. */ |
| 378 | if (ehdr->e_type != ET_REL && ehdr->e_type != ET_EXEC |
| 379 | && ehdr->e_type != ET_DYN && ehdr->e_type != ET_CORE) |
| 380 | ERROR (gettext ("unknown object file type %d\n"), ehdr->e_type); |
| 381 | |
| 382 | /* Check the e_machine field. */ |
| 383 | for (cnt = 0; cnt < nvalid_e_machine; ++cnt) |
| 384 | if (valid_e_machine[cnt] == ehdr->e_machine) |
| 385 | break; |
| 386 | if (cnt == nvalid_e_machine) |
| 387 | ERROR (gettext ("unknown machine type %d\n"), ehdr->e_machine); |
| 388 | |
| 389 | /* Check the e_version field. */ |
| 390 | if (ehdr->e_version != EV_CURRENT) |
| 391 | ERROR (gettext ("unknown object file version\n")); |
| 392 | |
| 393 | /* Check the e_phoff and e_phnum fields. */ |
| 394 | if (ehdr->e_phoff == 0) |
| 395 | { |
| 396 | if (ehdr->e_phnum != 0) |
| 397 | ERROR (gettext ("invalid program header offset\n")); |
| 398 | else if (ehdr->e_type == ET_EXEC || ehdr->e_type == ET_DYN) |
| 399 | ERROR (gettext ("\ |
| 400 | executables and DSOs cannot have zero program header offset\n")); |
| 401 | } |
| 402 | else if (ehdr->e_phnum == 0) |
| 403 | ERROR (gettext ("invalid number of program header entries\n")); |
| 404 | |
| 405 | /* Check the e_shoff field. */ |
| 406 | shnum = ehdr->e_shnum; |
| 407 | shstrndx = ehdr->e_shstrndx; |
| 408 | if (ehdr->e_shoff == 0) |
| 409 | { |
| 410 | if (ehdr->e_shnum != 0) |
| 411 | ERROR (gettext ("invalid section header table offset\n")); |
| 412 | else if (ehdr->e_type != ET_EXEC && ehdr->e_type != ET_DYN |
| 413 | && ehdr->e_type != ET_CORE) |
| 414 | ERROR (gettext ("section header table must be present\n")); |
| 415 | } |
| 416 | else |
| 417 | { |
| 418 | if (ehdr->e_shnum == 0) |
| 419 | { |
| 420 | /* Get the header of the zeroth section. The sh_size field |
| 421 | might contain the section number. */ |
| 422 | GElf_Shdr shdr_mem; |
| 423 | GElf_Shdr *shdr; |
| 424 | |
| 425 | shdr = gelf_getshdr (elf_getscn (ebl->elf, 0), &shdr_mem); |
| 426 | if (shdr != NULL) |
| 427 | { |
| 428 | /* The error will be reported later. */ |
| 429 | if (shdr->sh_size == 0) |
| 430 | ERROR (gettext ("\ |
| 431 | invalid number of section header table entries\n")); |
| 432 | else |
| 433 | shnum = shdr->sh_size; |
| 434 | } |
| 435 | } |
| 436 | |
| 437 | if (ehdr->e_shstrndx == SHN_XINDEX) |
| 438 | { |
| 439 | /* Get the header of the zeroth section. The sh_size field |
| 440 | might contain the section number. */ |
| 441 | GElf_Shdr shdr_mem; |
| 442 | GElf_Shdr *shdr; |
| 443 | |
| 444 | shdr = gelf_getshdr (elf_getscn (ebl->elf, 0), &shdr_mem); |
| 445 | if (shdr != NULL) |
| 446 | { |
| 447 | /* The error will be reported later. */ |
| 448 | if (shdr->sh_link >= shnum) |
| 449 | ERROR (gettext ("invalid section header index\n")); |
| 450 | else |
| 451 | shstrndx = shdr->sh_link; |
| 452 | } |
| 453 | } |
| 454 | else if (shstrndx >= shnum) |
| 455 | ERROR (gettext ("invalid section header index\n")); |
| 456 | } |
| 457 | |
| 458 | /* Check the e_flags field. */ |
| 459 | if (!ebl_machine_flag_check (ebl, ehdr->e_flags)) |
| 460 | ERROR (gettext ("invalid machine flags: %s\n"), |
| 461 | ebl_machine_flag_name (ebl, ehdr->e_flags, buf, sizeof (buf))); |
| 462 | |
| 463 | /* Check e_ehsize, e_phentsize, and e_shentsize fields. */ |
| 464 | if (gelf_getclass (ebl->elf) == ELFCLASS32) |
| 465 | { |
| 466 | if (ehdr->e_ehsize != 0 && ehdr->e_ehsize != sizeof (Elf32_Ehdr)) |
| 467 | ERROR (gettext ("invalid ELF header size: %hd\n"), ehdr->e_ehsize); |
| 468 | |
| 469 | if (ehdr->e_phentsize != 0 && ehdr->e_phentsize != sizeof (Elf32_Phdr)) |
| 470 | ERROR (gettext ("invalid program header size: %hd\n"), |
| 471 | ehdr->e_phentsize); |
| 472 | else if (ehdr->e_phoff + ehdr->e_phnum * ehdr->e_phentsize > size) |
| 473 | ERROR (gettext ("invalid program header position or size\n")); |
| 474 | |
| 475 | if (ehdr->e_shentsize != 0 && ehdr->e_shentsize != sizeof (Elf32_Shdr)) |
| 476 | ERROR (gettext ("invalid section header size: %hd\n"), |
| 477 | ehdr->e_shentsize); |
| 478 | else if (ehdr->e_shoff + ehdr->e_shnum * ehdr->e_shentsize > size) |
| 479 | ERROR (gettext ("invalid section header position or size\n")); |
| 480 | } |
| 481 | else if (gelf_getclass (ebl->elf) == ELFCLASS64) |
| 482 | { |
| 483 | if (ehdr->e_ehsize != 0 && ehdr->e_ehsize != sizeof (Elf64_Ehdr)) |
| 484 | ERROR (gettext ("invalid ELF header size: %hd\n"), ehdr->e_ehsize); |
| 485 | |
| 486 | if (ehdr->e_phentsize != 0 && ehdr->e_phentsize != sizeof (Elf64_Phdr)) |
| 487 | ERROR (gettext ("invalid program header size: %hd\n"), |
| 488 | ehdr->e_phentsize); |
| 489 | else if (ehdr->e_phoff + ehdr->e_phnum * ehdr->e_phentsize > size) |
| 490 | ERROR (gettext ("invalid program header position or size\n")); |
| 491 | |
| 492 | if (ehdr->e_shentsize != 0 && ehdr->e_shentsize != sizeof (Elf64_Shdr)) |
| 493 | ERROR (gettext ("invalid section header size: %hd\n"), |
| 494 | ehdr->e_shentsize); |
| 495 | else if (ehdr->e_shoff + ehdr->e_shnum * ehdr->e_shentsize > size) |
| 496 | ERROR (gettext ("invalid section header position or size\n")); |
| 497 | } |
| 498 | } |
| 499 | |
| 500 | |
| 501 | /* Check that there is a section group section with index < IDX which |
| 502 | contains section IDX and that there is exactly one. */ |
| 503 | static void |
| 504 | check_scn_group (Ebl *ebl, int idx) |
| 505 | { |
| 506 | if (scnref[idx] == 0) |
| 507 | { |
| 508 | /* No reference so far. Search following sections, maybe the |
| 509 | order is wrong. */ |
| 510 | size_t cnt; |
| 511 | |
| 512 | for (cnt = idx + 1; cnt < shnum; ++cnt) |
| 513 | { |
| 514 | Elf_Scn *scn; |
| 515 | GElf_Shdr shdr_mem; |
| 516 | GElf_Shdr *shdr; |
| 517 | Elf_Data *data; |
| 518 | Elf32_Word *grpdata; |
| 519 | size_t inner; |
| 520 | |
| 521 | scn = elf_getscn (ebl->elf, cnt); |
| 522 | shdr = gelf_getshdr (scn, &shdr_mem); |
| 523 | if (shdr == NULL) |
| 524 | /* We cannot get the section header so we cannot check it. |
| 525 | The error to get the section header will be shown |
| 526 | somewhere else. */ |
| 527 | continue; |
| 528 | |
| 529 | if (shdr->sh_type != SHT_GROUP) |
| 530 | continue; |
| 531 | |
| 532 | data = elf_getdata (scn, NULL); |
| 533 | if (data == NULL || data->d_size < sizeof (Elf32_Word)) |
| 534 | /* Cannot check the section. */ |
| 535 | continue; |
| 536 | |
| 537 | grpdata = (Elf32_Word *) data->d_buf; |
| 538 | for (inner = 1; inner < data->d_size / sizeof (Elf32_Word); ++inner) |
| 539 | if (grpdata[inner] == (Elf32_Word) idx) |
| 540 | goto out; |
| 541 | } |
| 542 | |
| 543 | out: |
| 544 | if (cnt == shnum) |
| 545 | ERROR (gettext ("\ |
| 546 | section [%2d] '%s': section with SHF_GROUP flag set not part of a section group\n"), |
| 547 | idx, section_name (ebl, idx)); |
| 548 | else |
| 549 | ERROR (gettext ("\ |
| 550 | section [%2d] '%s': section group [%2zu] '%s' does not preceed group member\n"), |
| 551 | idx, section_name (ebl, idx), |
| 552 | cnt, section_name (ebl, cnt)); |
| 553 | } |
| 554 | } |
| 555 | |
| 556 | |
| 557 | static void |
| 558 | check_symtab (Ebl *ebl, GElf_Ehdr *ehdr, int idx) |
| 559 | { |
| 560 | bool no_xndx_warned = false; |
| 561 | int no_pt_tls = 0; |
| 562 | |
| 563 | Elf_Scn *scn = elf_getscn (ebl->elf, idx); |
| 564 | GElf_Shdr shdr_mem; |
| 565 | GElf_Shdr *shdr = gelf_getshdr (scn, &shdr_mem); |
| 566 | GElf_Shdr strshdr_mem; |
| 567 | GElf_Shdr *strshdr = gelf_getshdr (elf_getscn (ebl->elf, shdr->sh_link), |
| 568 | &strshdr_mem); |
| 569 | if (shdr == NULL || strshdr == NULL) |
| 570 | return; |
| 571 | Elf_Data *data = elf_getdata (scn, NULL); |
| 572 | if (data == NULL) |
| 573 | { |
| 574 | ERROR (gettext ("section [%2d] '%s': cannot get section data\n"), |
| 575 | idx, section_name (ebl, idx)); |
| 576 | return; |
| 577 | } |
| 578 | |
| 579 | if (strshdr->sh_type != SHT_STRTAB) |
| 580 | ERROR (gettext ("section [%2d] '%s': referenced as string table for section [%2d] '%s' but type is not SHT_STRTAB\n"), |
| 581 | shdr->sh_link, section_name (ebl, shdr->sh_link), |
| 582 | idx, section_name (ebl, idx)); |
| 583 | |
| 584 | /* Search for an extended section index table section. */ |
| 585 | size_t cnt; |
| 586 | GElf_Shdr xndxshdr_mem; |
| 587 | GElf_Shdr *xndxshdr = NULL; |
| 588 | Elf_Data *xndxdata = NULL; |
| 589 | Elf32_Word xndxscnidx = 0; |
| 590 | for (cnt = 1; cnt < shnum; ++cnt) |
| 591 | if (cnt != (size_t) idx) |
| 592 | { |
| 593 | Elf_Scn *xndxscn = elf_getscn (ebl->elf, cnt); |
| 594 | xndxshdr = gelf_getshdr (xndxscn, &xndxshdr_mem); |
| 595 | xndxdata = elf_getdata (xndxscn, NULL); |
| 596 | xndxscnidx = elf_ndxscn (xndxscn); |
| 597 | |
| 598 | if (xndxshdr == NULL || xndxdata == NULL) |
| 599 | continue; |
| 600 | |
| 601 | if (xndxshdr->sh_type == SHT_SYMTAB_SHNDX |
| 602 | && xndxshdr->sh_link == (GElf_Word) idx) |
| 603 | break; |
| 604 | } |
| 605 | if (cnt == shnum) |
| 606 | { |
| 607 | xndxshdr = NULL; |
| 608 | xndxdata = NULL; |
| 609 | } |
| 610 | |
| 611 | if (shdr->sh_entsize != gelf_fsize (ebl->elf, ELF_T_SYM, 1, EV_CURRENT)) |
| 612 | ERROR (gettext ("\ |
| 613 | section [%2zu] '%s': entry size is does not match ElfXX_Sym\n"), |
| 614 | cnt, section_name (ebl, cnt)); |
| 615 | |
| 616 | /* Test the zeroth entry. */ |
| 617 | GElf_Sym sym_mem; |
| 618 | Elf32_Word xndx; |
| 619 | GElf_Sym *sym = gelf_getsymshndx (data, xndxdata, 0, &sym_mem, &xndx); |
| 620 | if (sym == NULL) |
| 621 | ERROR (gettext ("section [%2d] '%s': cannot get symbol %d: %s\n"), |
| 622 | idx, section_name (ebl, idx), 0, elf_errmsg (-1)); |
| 623 | else |
| 624 | { |
| 625 | if (sym->st_name != 0) |
| 626 | ERROR (gettext ("section [%2d] '%s': '%s' in zeroth entry not zero\n"), |
| 627 | idx, section_name (ebl, idx), "st_name"); |
| 628 | if (sym->st_value != 0) |
| 629 | ERROR (gettext ("section [%2d] '%s': '%s' in zeroth entry not zero\n"), |
| 630 | idx, section_name (ebl, idx), "st_value"); |
| 631 | if (sym->st_size != 0) |
| 632 | ERROR (gettext ("section [%2d] '%s': '%s' in zeroth entry not zero\n"), |
| 633 | idx, section_name (ebl, idx), "st_size"); |
| 634 | if (sym->st_info != 0) |
| 635 | ERROR (gettext ("section [%2d] '%s': '%s' in zeroth entry not zero\n"), |
| 636 | idx, section_name (ebl, idx), "st_info"); |
| 637 | if (sym->st_other != 0) |
| 638 | ERROR (gettext ("section [%2d] '%s': '%s' in zeroth entry not zero\n"), |
| 639 | idx, section_name (ebl, idx), "st_other"); |
| 640 | if (sym->st_shndx != 0) |
| 641 | ERROR (gettext ("section [%2d] '%s': '%s' in zeroth entry not zero\n"), |
| 642 | idx, section_name (ebl, idx), "st_shndx"); |
| 643 | if (xndxdata != NULL && xndx != 0) |
| 644 | ERROR (gettext ("\ |
| 645 | section [%2d] '%s': XINDEX for zeroth entry not zero\n"), |
| 646 | xndxscnidx, section_name (ebl, xndxscnidx)); |
| 647 | } |
| 648 | |
| 649 | for (cnt = 1; cnt < shdr->sh_size / shdr->sh_entsize; ++cnt) |
| 650 | { |
| 651 | sym = gelf_getsymshndx (data, xndxdata, cnt, &sym_mem, &xndx); |
| 652 | if (sym == NULL) |
| 653 | { |
| 654 | ERROR (gettext ("section [%2d] '%s': cannot get symbol %zu: %s\n"), |
| 655 | idx, section_name (ebl, idx), cnt, elf_errmsg (-1)); |
| 656 | continue; |
| 657 | } |
| 658 | |
| 659 | const char *name = NULL; |
| 660 | if (sym->st_name >= strshdr->sh_size) |
| 661 | ERROR (gettext ("\ |
| 662 | section [%2d] '%s': symbol %zu: invalid name value\n"), |
| 663 | idx, section_name (ebl, idx), cnt); |
| 664 | else |
| 665 | { |
| 666 | name = elf_strptr (ebl->elf, shdr->sh_link, sym->st_name); |
| 667 | assert (name != NULL); |
| 668 | } |
| 669 | |
| 670 | if (sym->st_shndx == SHN_XINDEX) |
| 671 | { |
| 672 | if (xndxdata == NULL) |
| 673 | { |
| 674 | ERROR (gettext ("\ |
| 675 | section [%2d] '%s': symbol %zu: too large section index but no extended section index section\n"), |
| 676 | idx, section_name (ebl, idx), cnt); |
| 677 | no_xndx_warned = true; |
| 678 | } |
| 679 | else if (xndx < SHN_LORESERVE) |
| 680 | ERROR (gettext ("\ |
| 681 | section [%2d] '%s': symbol %zu: XINDEX used for index which would fit in st_shndx (%" PRIu32 ")\n"), |
| 682 | xndxscnidx, section_name (ebl, xndxscnidx), cnt, |
| 683 | xndx); |
| 684 | } |
| 685 | else if ((sym->st_shndx >= SHN_LORESERVE |
| 686 | // && sym->st_shndx <= SHN_HIRESERVE always true |
| 687 | && sym->st_shndx != SHN_ABS |
| 688 | && sym->st_shndx != SHN_COMMON) |
| 689 | || (sym->st_shndx >= shnum |
| 690 | && (sym->st_shndx < SHN_LORESERVE |
| 691 | /* || sym->st_shndx > SHN_HIRESERVE always false */))) |
| 692 | ERROR (gettext ("\ |
| 693 | section [%2d] '%s': symbol %zu: invalid section index\n"), |
| 694 | idx, section_name (ebl, idx), cnt); |
| 695 | else |
| 696 | xndx = sym->st_shndx; |
| 697 | |
| 698 | if (GELF_ST_TYPE (sym->st_info) >= STT_NUM) |
| 699 | ERROR (gettext ("section [%2d] '%s': symbol %zu: unknown type\n"), |
| 700 | idx, section_name (ebl, idx), cnt); |
| 701 | |
| 702 | if (GELF_ST_BIND (sym->st_info) >= STB_NUM) |
| 703 | ERROR (gettext ("\ |
| 704 | section [%2d] '%s': symbol %zu: unknown symbol binding\n"), |
| 705 | idx, section_name (ebl, idx), cnt); |
| 706 | |
| 707 | if (xndx == SHN_COMMON) |
| 708 | { |
| 709 | /* Common symbols can only appear in relocatable files. */ |
| 710 | if (ehdr->e_type != ET_REL) |
| 711 | ERROR (gettext ("\ |
| 712 | section [%2d] '%s': symbol %zu: COMMON only allowed in relocatable files\n"), |
| 713 | idx, section_name (ebl, idx), cnt); |
| 714 | if (cnt < shdr->sh_info) |
| 715 | ERROR (gettext ("\ |
| 716 | section [%2d] '%s': symbol %zu: local COMMON symbols are nonsense\n"), |
| 717 | idx, section_name (ebl, idx), cnt); |
| 718 | if (GELF_R_TYPE (sym->st_info) == STT_FUNC) |
| 719 | ERROR (gettext ("\ |
| 720 | section [%2d] '%s': symbol %zu: function in COMMON section is nonsense\n"), |
| 721 | idx, section_name (ebl, idx), cnt); |
| 722 | } |
| 723 | else if (xndx > 0 && xndx < shnum) |
| 724 | { |
| 725 | GElf_Shdr destshdr_mem; |
| 726 | GElf_Shdr *destshdr; |
| 727 | |
| 728 | destshdr = gelf_getshdr (elf_getscn (ebl->elf, xndx), &destshdr_mem); |
| 729 | if (destshdr != NULL) |
| 730 | { |
| 731 | if (GELF_ST_TYPE (sym->st_info) != STT_TLS) |
| 732 | { |
| 733 | if ((sym->st_value - destshdr->sh_addr) > destshdr->sh_size) |
| 734 | ERROR (gettext ("\ |
| 735 | section [%2d] '%s': symbol %zu: st_value out of bounds\n"), |
| 736 | idx, section_name (ebl, idx), cnt); |
| 737 | else if ((sym->st_value - destshdr->sh_addr + sym->st_size) |
| 738 | > destshdr->sh_size) |
| 739 | ERROR (gettext ("\ |
| 740 | section [%2d] '%s': symbol %zu does not fit completely in referenced section [%2d] '%s'\n"), |
| 741 | idx, section_name (ebl, idx), cnt, |
| 742 | (int) xndx, section_name (ebl, xndx)); |
| 743 | } |
| 744 | else |
| 745 | { |
| 746 | if ((destshdr->sh_flags & SHF_TLS) == 0) |
| 747 | ERROR (gettext ("\ |
| 748 | section [%2d] '%s': symbol %zu: referenced section [%2d] '%s' does not have SHF_TLS flag set\n"), |
| 749 | idx, section_name (ebl, idx), cnt, |
| 750 | (int) xndx, section_name (ebl, xndx)); |
| 751 | |
| 752 | if (ehdr->e_type == ET_REL) |
| 753 | { |
| 754 | /* For object files the symbol value must fall |
| 755 | into the section. */ |
| 756 | if (sym->st_value > destshdr->sh_size) |
| 757 | ERROR (gettext ("\ |
| 758 | section [%2d] '%s': symbol %zu: st_value out of bounds of referenced section [%2d] '%s'\n"), |
| 759 | idx, section_name (ebl, idx), cnt, |
| 760 | (int) xndx, section_name (ebl, xndx)); |
| 761 | else if (sym->st_value + sym->st_size |
| 762 | > destshdr->sh_size) |
| 763 | ERROR (gettext ("\ |
| 764 | section [%2d] '%s': symbol %zu does not fit completely in referenced section [%2d] '%s'\n"), |
| 765 | idx, section_name (ebl, idx), cnt, |
| 766 | (int) xndx, section_name (ebl, xndx)); |
| 767 | } |
| 768 | else |
| 769 | { |
| 770 | GElf_Phdr phdr_mem; |
| 771 | GElf_Phdr *phdr = NULL; |
| 772 | int pcnt; |
| 773 | |
| 774 | for (pcnt = 0; pcnt < ehdr->e_phnum; ++pcnt) |
| 775 | { |
| 776 | phdr = gelf_getphdr (ebl->elf, pcnt, &phdr_mem); |
| 777 | if (phdr != NULL && phdr->p_type == PT_TLS) |
| 778 | break; |
| 779 | } |
| 780 | |
| 781 | if (pcnt == ehdr->e_phnum) |
| 782 | { |
| 783 | if (no_pt_tls++ == 0) |
| 784 | ERROR (gettext ("\ |
| 785 | section [%2d] '%s': symbol %zu: TLS symbol but no TLS program header entry\n"), |
| 786 | idx, section_name (ebl, idx), cnt); |
| 787 | } |
| 788 | else |
| 789 | { |
| 790 | if (sym->st_value |
| 791 | < destshdr->sh_offset - phdr->p_offset) |
| 792 | ERROR (gettext ("\ |
| 793 | section [%2d] '%s': symbol %zu: st_value short of referenced section [%2d] '%s'\n"), |
| 794 | idx, section_name (ebl, idx), cnt, |
| 795 | (int) xndx, section_name (ebl, xndx)); |
| 796 | else if (sym->st_value |
| 797 | > (destshdr->sh_offset - phdr->p_offset |
| 798 | + destshdr->sh_size)) |
| 799 | ERROR (gettext ("\ |
| 800 | section [%2d] '%s': symbol %zu: st_value out of bounds of referenced section [%2d] '%s'\n"), |
| 801 | idx, section_name (ebl, idx), cnt, |
| 802 | (int) xndx, section_name (ebl, xndx)); |
| 803 | else if (sym->st_value + sym->st_size |
| 804 | > (destshdr->sh_offset - phdr->p_offset |
| 805 | + destshdr->sh_size)) |
| 806 | ERROR (gettext ("\ |
| 807 | section [%2d] '%s': symbol %zu does not fit completely in referenced section [%2d] '%s'\n"), |
| 808 | idx, section_name (ebl, idx), cnt, |
| 809 | (int) xndx, section_name (ebl, xndx)); |
| 810 | } |
| 811 | } |
| 812 | } |
| 813 | } |
| 814 | } |
| 815 | |
| 816 | if (GELF_ST_BIND (sym->st_info) == STB_LOCAL) |
| 817 | { |
| 818 | if (cnt >= shdr->sh_info) |
| 819 | ERROR (gettext ("\ |
| 820 | section [%2d] '%s': symbol %zu: local symbol outside range described in sh_info\n"), |
| 821 | idx, section_name (ebl, idx), cnt); |
| 822 | } |
| 823 | else |
| 824 | { |
| 825 | if (cnt < shdr->sh_info) |
| 826 | ERROR (gettext ("\ |
| 827 | section [%2d] '%s': symbol %zu: non-local symbol outside range described in sh_info\n"), |
| 828 | idx, section_name (ebl, idx), cnt); |
| 829 | } |
| 830 | |
| 831 | if (GELF_ST_TYPE (sym->st_info) == STT_SECTION |
| 832 | && GELF_ST_BIND (sym->st_info) != STB_LOCAL) |
| 833 | ERROR (gettext ("\ |
| 834 | section [%2d] '%s': symbol %zu: non-local section symbol\n"), |
| 835 | idx, section_name (ebl, idx), cnt); |
| 836 | |
| 837 | if (name != NULL) |
| 838 | { |
| 839 | if (strcmp (name, "_GLOBAL_OFFSET_TABLE_") == 0) |
| 840 | { |
| 841 | /* Check that address and size match the global offset |
| 842 | table. We have to locate the GOT by searching for a |
| 843 | section named ".got". */ |
| 844 | Elf_Scn *gscn = NULL; |
| 845 | GElf_Addr addr = 0; |
| 846 | GElf_Xword size = 0; |
| 847 | bool found = false; |
| 848 | |
| 849 | while ((gscn = elf_nextscn (ebl->elf, gscn)) != NULL) |
| 850 | { |
| 851 | GElf_Shdr gshdr_mem; |
| 852 | GElf_Shdr *gshdr = gelf_getshdr (gscn, &gshdr_mem); |
| 853 | assert (gshdr != NULL); |
| 854 | |
| 855 | const char *sname = elf_strptr (ebl->elf, ehdr->e_shstrndx, |
| 856 | gshdr->sh_name); |
| 857 | if (sname != NULL) |
| 858 | { |
| 859 | if (strcmp (sname, ".got.plt") == 0) |
| 860 | { |
| 861 | addr = gshdr->sh_addr; |
| 862 | size = gshdr->sh_size; |
| 863 | found = true; |
| 864 | break; |
| 865 | } |
| 866 | if (strcmp (sname, ".got") == 0) |
| 867 | { |
| 868 | addr = gshdr->sh_addr; |
| 869 | size = gshdr->sh_size; |
| 870 | found = true; |
| 871 | /* Do not stop looking. There might be a |
| 872 | .got.plt section. */ |
| 873 | } |
| 874 | } |
| 875 | } |
| 876 | |
| 877 | if (found) |
| 878 | { |
| 879 | /* Found it. */ |
| 880 | if (sym->st_value != addr) |
| 881 | /* This test is more strict than the psABIs which |
| 882 | usually allow the symbol to be in the middle of |
| 883 | the .got section, allowing negative offsets. */ |
| 884 | ERROR (gettext ("\ |
| 885 | section [%2d] '%s': _GLOBAL_OFFSET_TABLE_ symbol value %#" PRIx64 " does not match .got section address %#" PRIx64 "\n"), |
| 886 | idx, section_name (ebl, idx), |
| 887 | (uint64_t) sym->st_value, (uint64_t) addr); |
| 888 | |
| 889 | if (!gnuld && sym->st_size != size) |
| 890 | ERROR (gettext ("\ |
| 891 | section [%2d] '%s': _GLOBAL_OFFSET_TABLE_ symbol size %" PRIu64 " does not match .got section size %" PRIu64 "\n"), |
| 892 | idx, section_name (ebl, idx), |
| 893 | (uint64_t) sym->st_size, (uint64_t) size); |
| 894 | } |
| 895 | else |
| 896 | ERROR (gettext ("\ |
| 897 | section [%2d] '%s': _GLOBAL_OFFSET_TABLE_ symbol present, but no .got section\n"), |
| 898 | idx, section_name (ebl, idx)); |
| 899 | } |
| 900 | else if (strcmp (name, "_DYNAMIC") == 0) |
| 901 | { |
| 902 | /* Check that address and size match the dynamic |
| 903 | section. We locate the dynamic section via the |
| 904 | program header entry. */ |
| 905 | int pcnt; |
| 906 | |
| 907 | for (pcnt = 0; pcnt < ehdr->e_phnum; ++pcnt) |
| 908 | { |
| 909 | GElf_Phdr phdr_mem; |
| 910 | GElf_Phdr *phdr = gelf_getphdr (ebl->elf, pcnt, &phdr_mem); |
| 911 | |
| 912 | if (phdr != NULL && phdr->p_type == PT_DYNAMIC) |
| 913 | { |
| 914 | if (sym->st_value != phdr->p_vaddr) |
| 915 | ERROR (gettext ("\ |
| 916 | section [%2d] '%s': _DYNAMIC_ symbol value %#" PRIx64 " does not match dynamic segment address %#" PRIx64 "\n"), |
| 917 | idx, section_name (ebl, idx), |
| 918 | (uint64_t) sym->st_value, |
| 919 | (uint64_t) phdr->p_vaddr); |
| 920 | |
| 921 | if (!gnuld && sym->st_size != phdr->p_memsz) |
| 922 | ERROR (gettext ("\ |
| 923 | section [%2d] '%s': _DYNAMIC symbol size %" PRIu64 " does not match dynamic segment size %" PRIu64 "\n"), |
| 924 | idx, section_name (ebl, idx), |
| 925 | (uint64_t) sym->st_size, |
| 926 | (uint64_t) phdr->p_memsz); |
| 927 | |
| 928 | break; |
| 929 | } |
| 930 | } |
| 931 | } |
| 932 | } |
| 933 | } |
| 934 | } |
| 935 | |
| 936 | |
| 937 | static bool |
| 938 | is_rel_dyn (Ebl *ebl, GElf_Ehdr *ehdr, int idx, GElf_Shdr *shdr, bool rela) |
| 939 | { |
| 940 | /* If this is no executable or DSO it cannot be a .rel.dyn section. */ |
| 941 | if (ehdr->e_type != ET_EXEC && ehdr->e_type != ET_DYN) |
| 942 | return false; |
| 943 | |
| 944 | /* Check the section name. Unfortunately necessary. */ |
| 945 | if (strcmp (section_name (ebl, idx), rela ? ".rela.dyn" : ".rel.dyn")) |
| 946 | return false; |
| 947 | |
| 948 | /* When a .rel.dyn section is used a DT_RELCOUNT dynamic section |
| 949 | entry can be present as well. */ |
| 950 | Elf_Scn *scn = NULL; |
| 951 | while ((scn = elf_nextscn (ebl->elf, scn)) != NULL) |
| 952 | { |
| 953 | GElf_Shdr rcshdr_mem; |
| 954 | const GElf_Shdr *rcshdr = gelf_getshdr (scn, &rcshdr_mem); |
| 955 | assert (rcshdr != NULL); |
| 956 | |
| 957 | if (rcshdr->sh_type == SHT_DYNAMIC) |
| 958 | { |
| 959 | /* Found the dynamic section. Look through it. */ |
| 960 | Elf_Data *d = elf_getdata (scn, NULL); |
| 961 | size_t cnt; |
| 962 | |
| 963 | for (cnt = 1; cnt < rcshdr->sh_size / rcshdr->sh_entsize; ++cnt) |
| 964 | { |
| 965 | GElf_Dyn dyn_mem; |
| 966 | GElf_Dyn *dyn = gelf_getdyn (d, cnt, &dyn_mem); |
| 967 | assert (dyn != NULL); |
| 968 | |
| 969 | if (dyn->d_tag == DT_RELCOUNT) |
| 970 | { |
| 971 | /* Found it. One last check: does the number |
| 972 | specified number of relative relocations exceed |
| 973 | the total number of relocations? */ |
| 974 | if (dyn->d_un.d_val > shdr->sh_size / shdr->sh_entsize) |
| 975 | ERROR (gettext ("\ |
| 976 | section [%2d] '%s': DT_RELCOUNT value %d too high for this section\n"), |
| 977 | idx, section_name (ebl, idx), |
| 978 | (int) dyn->d_un.d_val); |
| 979 | } |
| 980 | } |
| 981 | |
| 982 | break; |
| 983 | } |
| 984 | } |
| 985 | |
| 986 | return true; |
| 987 | } |
| 988 | |
| 989 | |
| 990 | static void |
| 991 | check_rela (Ebl *ebl, GElf_Ehdr *ehdr, int idx) |
| 992 | { |
| 993 | Elf_Scn *scn; |
| 994 | GElf_Shdr shdr_mem; |
| 995 | GElf_Shdr *shdr; |
| 996 | Elf_Data *data; |
| 997 | GElf_Shdr destshdr_mem; |
| 998 | GElf_Shdr *destshdr = NULL; |
| 999 | size_t cnt; |
| 1000 | bool reldyn = false; |
| 1001 | bool known_broken = gnuld; |
| 1002 | |
| 1003 | scn = elf_getscn (ebl->elf, idx); |
| 1004 | shdr = gelf_getshdr (scn, &shdr_mem); |
| 1005 | if (shdr == NULL) |
| 1006 | return; |
| 1007 | data = elf_getdata (scn, NULL); |
| 1008 | if (data == NULL) |
| 1009 | { |
| 1010 | ERROR (gettext ("section [%2d] '%s': cannot get section data\n"), |
| 1011 | idx, section_name (ebl, idx)); |
| 1012 | return; |
| 1013 | } |
| 1014 | |
| 1015 | /* Check whether the link to the section we relocate is reasonable. */ |
| 1016 | if (shdr->sh_info >= shnum) |
| 1017 | ERROR (gettext ("section [%2d] '%s': invalid destination section index\n"), |
| 1018 | idx, section_name (ebl, idx)); |
| 1019 | else |
| 1020 | { |
| 1021 | destshdr = gelf_getshdr (elf_getscn (ebl->elf, shdr->sh_info), |
| 1022 | &destshdr_mem); |
| 1023 | if (destshdr != NULL) |
| 1024 | { |
| 1025 | if(destshdr->sh_type != SHT_PROGBITS |
| 1026 | && destshdr->sh_type != SHT_NOBITS) |
| 1027 | { |
| 1028 | reldyn = is_rel_dyn (ebl, ehdr, idx, shdr, true); |
| 1029 | if (!reldyn) |
| 1030 | ERROR (gettext ("\ |
| 1031 | section [%2d] '%s': invalid destination section type\n"), |
| 1032 | idx, section_name (ebl, idx)); |
| 1033 | else |
| 1034 | { |
| 1035 | /* There is no standard, but we require that .rela.dyn |
| 1036 | sections have a sh_info value of zero. */ |
| 1037 | if (shdr->sh_info != 0) |
| 1038 | ERROR (gettext ("\ |
| 1039 | section [%2d] '%s': sh_info should be zero\n"), |
| 1040 | idx, section_name (ebl, idx)); |
| 1041 | } |
| 1042 | } |
| 1043 | |
| 1044 | if ((destshdr->sh_flags & (SHF_MERGE | SHF_STRINGS)) != 0) |
| 1045 | ERROR (gettext ("\ |
| 1046 | section [%2d] '%s': no relocations for merge-able sections possible\n"), |
| 1047 | idx, section_name (ebl, idx)); |
| 1048 | } |
| 1049 | } |
| 1050 | |
| 1051 | if (shdr->sh_entsize != gelf_fsize (ebl->elf, ELF_T_RELA, 1, EV_CURRENT)) |
| 1052 | ERROR (gettext ("\ |
| 1053 | section [%2d] '%s': section entry size does not match ElfXX_Rela\n"), |
| 1054 | idx, section_name (ebl, idx)); |
| 1055 | |
| 1056 | Elf_Scn *symscn = elf_getscn (ebl->elf, shdr->sh_link); |
| 1057 | GElf_Shdr symshdr_mem; |
| 1058 | GElf_Shdr *symshdr = gelf_getshdr (symscn, &symshdr_mem); |
| 1059 | Elf_Data *symdata = elf_getdata (symscn, NULL); |
| 1060 | |
| 1061 | for (cnt = 0; cnt < shdr->sh_size / shdr->sh_entsize; ++cnt) |
| 1062 | { |
| 1063 | GElf_Rela rela_mem; |
| 1064 | GElf_Rela *rela; |
| 1065 | |
| 1066 | rela = gelf_getrela (data, cnt, &rela_mem); |
| 1067 | if (rela == NULL) |
| 1068 | { |
| 1069 | ERROR (gettext ("\ |
| 1070 | section [%2d] '%s': cannot get relocation %zu: %s\n"), |
| 1071 | idx, section_name (ebl, idx), cnt, elf_errmsg (-1)); |
| 1072 | continue; |
| 1073 | } |
| 1074 | |
| 1075 | if (!ebl_reloc_type_check (ebl, GELF_R_TYPE (rela->r_info))) |
| 1076 | ERROR (gettext ("section [%2d] '%s': relocation %zu: invalid type\n"), |
| 1077 | idx, section_name (ebl, idx), cnt); |
| 1078 | else if (!ebl_reloc_valid_use (ebl, GELF_R_TYPE (rela->r_info))) |
| 1079 | ERROR (gettext ("\ |
| 1080 | section [%2d] '%s': relocation %zu: relocation type invalid for the file type\n"), |
| 1081 | idx, section_name (ebl, idx), cnt); |
| 1082 | |
| 1083 | if (symshdr != NULL |
| 1084 | && ((GELF_R_SYM (rela->r_info) + 1) |
| 1085 | * gelf_fsize (ebl->elf, ELF_T_SYM, 1, EV_CURRENT) |
| 1086 | > symshdr->sh_size)) |
| 1087 | ERROR (gettext ("\ |
| 1088 | section [%2d] '%s': relocation %zu: invalid symbol index\n"), |
| 1089 | idx, section_name (ebl, idx), cnt); |
| 1090 | |
| 1091 | if (ebl_gotpc_reloc_check (ebl, GELF_R_TYPE (rela->r_info))) |
| 1092 | { |
| 1093 | const char *name; |
| 1094 | char buf[64]; |
| 1095 | GElf_Sym sym_mem; |
| 1096 | GElf_Sym *sym = gelf_getsym (symdata, GELF_R_SYM (rela->r_info), |
| 1097 | &sym_mem); |
| 1098 | if (sym != NULL |
| 1099 | /* Get the name for the symbol. */ |
| 1100 | && (name = elf_strptr (ebl->elf, symshdr->sh_link, sym->st_name)) |
| 1101 | && strcmp (name, "_GLOBAL_OFFSET_TABLE_") !=0 ) |
| 1102 | ERROR (gettext ("\ |
| 1103 | section [%2d] '%s': relocation %zu: only symbol '_GLOBAL_OFFSET_TABLE_' can be used with %s\n"), |
| 1104 | idx, section_name (ebl, idx), cnt, |
| 1105 | ebl_reloc_type_name (ebl, GELF_R_SYM (rela->r_info), |
| 1106 | buf, sizeof (buf))); |
| 1107 | } |
| 1108 | |
| 1109 | if (reldyn) |
| 1110 | { |
| 1111 | // XXX TODO Check .rel.dyn section addresses. |
| 1112 | } |
| 1113 | else if (!known_broken) |
| 1114 | { |
| 1115 | if (destshdr != NULL |
| 1116 | && (rela->r_offset - destshdr->sh_addr) >= destshdr->sh_size) |
| 1117 | ERROR (gettext ("\ |
| 1118 | section [%2d] '%s': relocation %zu: offset out of bounds\n"), |
| 1119 | idx, section_name (ebl, idx), cnt); |
| 1120 | } |
| 1121 | |
| 1122 | if (symdata != NULL |
| 1123 | && ebl_copy_reloc_p (ebl, GELF_R_TYPE (rela->r_info))) |
| 1124 | { |
| 1125 | /* Make sure the referenced symbol is an object or unspecified. */ |
| 1126 | GElf_Sym sym_mem; |
| 1127 | GElf_Sym *sym = gelf_getsym (symdata, GELF_R_SYM (rela->r_info), |
| 1128 | &sym_mem); |
| 1129 | if (sym != NULL |
| 1130 | && GELF_ST_TYPE (sym->st_info) != STT_NOTYPE |
| 1131 | && GELF_ST_TYPE (sym->st_info) != STT_OBJECT) |
| 1132 | { |
| 1133 | char buf[64]; |
| 1134 | ERROR (gettext ("section [%2d] '%s': relocation %zu: copy relocation against symbol of type %s\n"), |
| 1135 | idx, section_name (ebl, idx), cnt, |
| 1136 | ebl_symbol_type_name (ebl, GELF_ST_TYPE (sym->st_info), |
| 1137 | buf, sizeof (buf))); |
| 1138 | } |
| 1139 | } |
| 1140 | } |
| 1141 | } |
| 1142 | |
| 1143 | |
| 1144 | static void |
| 1145 | check_rel (Ebl *ebl, GElf_Ehdr *ehdr, int idx) |
| 1146 | { |
| 1147 | Elf_Scn *scn; |
| 1148 | GElf_Shdr shdr_mem; |
| 1149 | GElf_Shdr *shdr; |
| 1150 | Elf_Data *data; |
| 1151 | GElf_Shdr destshdr_mem; |
| 1152 | GElf_Shdr *destshdr = NULL; |
| 1153 | size_t cnt; |
| 1154 | bool reldyn = false; |
| 1155 | bool known_broken = gnuld; |
| 1156 | |
| 1157 | scn = elf_getscn (ebl->elf, idx); |
| 1158 | shdr = gelf_getshdr (scn, &shdr_mem); |
| 1159 | if (shdr == NULL) |
| 1160 | return; |
| 1161 | data = elf_getdata (scn, NULL); |
| 1162 | if (data == NULL) |
| 1163 | { |
| 1164 | ERROR (gettext ("section [%2d] '%s': cannot get section data\n"), |
| 1165 | idx, section_name (ebl, idx)); |
| 1166 | return; |
| 1167 | } |
| 1168 | |
| 1169 | /* Check whether the link to the section we relocate is reasonable. */ |
| 1170 | if (shdr->sh_info >= shnum) |
| 1171 | ERROR (gettext ("section [%2d] '%s': invalid destination section index\n"), |
| 1172 | idx, section_name (ebl, idx)); |
| 1173 | else |
| 1174 | { |
| 1175 | destshdr = gelf_getshdr (elf_getscn (ebl->elf, shdr->sh_info), |
| 1176 | &destshdr_mem); |
| 1177 | if (destshdr != NULL) |
| 1178 | { |
| 1179 | if (destshdr->sh_type != SHT_PROGBITS |
| 1180 | && destshdr->sh_type != SHT_NOBITS) |
| 1181 | { |
| 1182 | reldyn = is_rel_dyn (ebl, ehdr, idx, shdr, false); |
| 1183 | if (!reldyn) |
| 1184 | ERROR (gettext ("\ |
| 1185 | section [%2d] '%s': invalid destination section type\n"), |
| 1186 | idx, section_name (ebl, idx)); |
| 1187 | else |
| 1188 | { |
| 1189 | /* There is no standard, but we require that .rela.dyn |
| 1190 | sections have a sh_info value of zero. */ |
| 1191 | if (shdr->sh_info != 0) |
| 1192 | ERROR (gettext ("\ |
| 1193 | section [%2d] '%s': sh_info should be zero\n"), |
| 1194 | idx, section_name (ebl, idx)); |
| 1195 | } |
| 1196 | } |
| 1197 | |
| 1198 | if ((destshdr->sh_flags & (SHF_MERGE | SHF_STRINGS)) != 0) |
| 1199 | ERROR (gettext ("\ |
| 1200 | section [%2d] '%s': no relocations for merge-able sections possible\n"), |
| 1201 | idx, section_name (ebl, idx)); |
| 1202 | } |
| 1203 | } |
| 1204 | |
| 1205 | if (shdr->sh_entsize != gelf_fsize (ebl->elf, ELF_T_REL, 1, EV_CURRENT)) |
| 1206 | ERROR (gettext ("\ |
| 1207 | section [%2d] '%s': section entry size does not match ElfXX_Rel\n"), |
| 1208 | idx, section_name (ebl, idx)); |
| 1209 | |
| 1210 | Elf_Scn *symscn = elf_getscn (ebl->elf, shdr->sh_link); |
| 1211 | GElf_Shdr symshdr_mem; |
| 1212 | GElf_Shdr *symshdr = gelf_getshdr (symscn, &symshdr_mem); |
| 1213 | Elf_Data *symdata = elf_getdata (symscn, NULL); |
| 1214 | |
| 1215 | for (cnt = 0; cnt < shdr->sh_size / shdr->sh_entsize; ++cnt) |
| 1216 | { |
| 1217 | GElf_Rel rel_mem; |
| 1218 | GElf_Rel *rel; |
| 1219 | |
| 1220 | rel = gelf_getrel (data, cnt, &rel_mem); |
| 1221 | if (rel == NULL) |
| 1222 | { |
| 1223 | ERROR (gettext ("\ |
| 1224 | section [%2d] '%s': cannot get relocation %zu: %s\n"), |
| 1225 | idx, section_name (ebl, idx), cnt, elf_errmsg (-1)); |
| 1226 | continue; |
| 1227 | } |
| 1228 | |
| 1229 | if (!ebl_reloc_type_check (ebl, GELF_R_TYPE (rel->r_info))) |
| 1230 | ERROR (gettext ("section [%2d] '%s': relocation %zu: invalid type\n"), |
| 1231 | idx, section_name (ebl, idx), cnt); |
| 1232 | else if (!ebl_reloc_valid_use (ebl, GELF_R_TYPE (rel->r_info))) |
| 1233 | ERROR (gettext ("\ |
| 1234 | section [%2d] '%s': relocation %zu: relocation type invalid for the file type\n"), |
| 1235 | idx, section_name (ebl, idx), cnt); |
| 1236 | |
| 1237 | if (symshdr != NULL |
| 1238 | && ((GELF_R_SYM (rel->r_info) + 1) |
| 1239 | * gelf_fsize (ebl->elf, ELF_T_SYM, 1, EV_CURRENT) |
| 1240 | > symshdr->sh_size)) |
| 1241 | ERROR (gettext ("\ |
| 1242 | section [%2d] '%s': relocation %zu: invalid symbol index\n"), |
| 1243 | idx, section_name (ebl, idx), cnt); |
| 1244 | |
| 1245 | if (ebl_gotpc_reloc_check (ebl, GELF_R_TYPE (rel->r_info))) |
| 1246 | { |
| 1247 | const char *name; |
| 1248 | char buf[64]; |
| 1249 | GElf_Sym sym_mem; |
| 1250 | GElf_Sym *sym = gelf_getsym (symdata, GELF_R_SYM (rel->r_info), |
| 1251 | &sym_mem); |
| 1252 | if (sym != NULL |
| 1253 | /* Get the name for the symbol. */ |
| 1254 | && (name = elf_strptr (ebl->elf, symshdr->sh_link, sym->st_name)) |
| 1255 | && strcmp (name, "_GLOBAL_OFFSET_TABLE_") !=0 ) |
| 1256 | ERROR (gettext ("\ |
| 1257 | section [%2d] '%s': relocation %zu: only symbol '_GLOBAL_OFFSET_TABLE_' can be used with %s\n"), |
| 1258 | idx, section_name (ebl, idx), cnt, |
| 1259 | ebl_reloc_type_name (ebl, GELF_R_SYM (rel->r_info), |
| 1260 | buf, sizeof (buf))); |
| 1261 | } |
| 1262 | |
| 1263 | if (reldyn) |
| 1264 | { |
| 1265 | // XXX TODO Check .rel.dyn section addresses. |
| 1266 | } |
| 1267 | else if (!known_broken) |
| 1268 | { |
| 1269 | if (destshdr != NULL |
| 1270 | && GELF_R_TYPE (rel->r_info) != 0 |
| 1271 | && (rel->r_offset - destshdr->sh_addr) >= destshdr->sh_size) |
| 1272 | ERROR (gettext ("\ |
| 1273 | section [%2d] '%s': relocation %zu: offset out of bounds\n"), |
| 1274 | idx, section_name (ebl, idx), cnt); |
| 1275 | } |
| 1276 | |
| 1277 | if (symdata != NULL |
| 1278 | && ebl_copy_reloc_p (ebl, GELF_R_TYPE (rel->r_info))) |
| 1279 | { |
| 1280 | /* Make sure the referenced symbol is an object or unspecified. */ |
| 1281 | GElf_Sym sym_mem; |
| 1282 | GElf_Sym *sym = gelf_getsym (symdata, GELF_R_SYM (rel->r_info), |
| 1283 | &sym_mem); |
| 1284 | if (sym != NULL |
| 1285 | && GELF_ST_TYPE (sym->st_info) != STT_NOTYPE |
| 1286 | && GELF_ST_TYPE (sym->st_info) != STT_OBJECT) |
| 1287 | { |
| 1288 | char buf[64]; |
| 1289 | ERROR (gettext ("section [%2d] '%s': relocation %zu: copy relocation against symbol of type %s\n"), |
| 1290 | idx, section_name (ebl, idx), cnt, |
| 1291 | ebl_symbol_type_name (ebl, GELF_ST_TYPE (sym->st_info), |
| 1292 | buf, sizeof (buf))); |
| 1293 | } |
| 1294 | } |
| 1295 | } |
| 1296 | } |
| 1297 | |
| 1298 | |
| 1299 | /* Number of dynamic sections. */ |
| 1300 | static int ndynamic; |
| 1301 | |
| 1302 | |
| 1303 | static void |
| 1304 | check_dynamic (Ebl *ebl, int idx) |
| 1305 | { |
| 1306 | Elf_Scn *scn; |
| 1307 | GElf_Shdr shdr_mem; |
| 1308 | GElf_Shdr *shdr; |
| 1309 | Elf_Data *data; |
| 1310 | GElf_Shdr strshdr_mem; |
| 1311 | GElf_Shdr *strshdr; |
| 1312 | size_t cnt; |
| 1313 | static const bool dependencies[DT_NUM][DT_NUM] = |
| 1314 | { |
| 1315 | [DT_NEEDED] = { [DT_STRTAB] = true }, |
| 1316 | [DT_PLTRELSZ] = { [DT_JMPREL] = true }, |
| 1317 | [DT_HASH] = { [DT_SYMTAB] = true }, |
| 1318 | [DT_STRTAB] = { [DT_STRSZ] = true }, |
| 1319 | [DT_SYMTAB] = { [DT_STRTAB] = true, [DT_HASH] = true, |
| 1320 | [DT_SYMENT] = true }, |
| 1321 | [DT_RELA] = { [DT_RELASZ] = true, [DT_RELAENT] = true }, |
| 1322 | [DT_RELASZ] = { [DT_RELA] = true }, |
| 1323 | [DT_RELAENT] = { [DT_RELA] = true }, |
| 1324 | [DT_STRSZ] = { [DT_STRTAB] = true }, |
| 1325 | [DT_SYMENT] = { [DT_SYMTAB] = true }, |
| 1326 | [DT_SONAME] = { [DT_STRTAB] = true }, |
| 1327 | [DT_RPATH] = { [DT_STRTAB] = true }, |
| 1328 | [DT_REL] = { [DT_RELSZ] = true, [DT_RELENT] = true }, |
| 1329 | [DT_RELSZ] = { [DT_REL] = true }, |
| 1330 | [DT_RELENT] = { [DT_REL] = true }, |
| 1331 | [DT_JMPREL] = { [DT_PLTRELSZ] = true, [DT_PLTREL] = true }, |
| 1332 | [DT_RUNPATH] = { [DT_STRTAB] = true }, |
| 1333 | [DT_PLTREL] = { [DT_JMPREL] = true }, |
| 1334 | [DT_PLTRELSZ] = { [DT_JMPREL] = true } |
| 1335 | }; |
| 1336 | bool has_dt[DT_NUM]; |
| 1337 | static const bool level2[DT_NUM] = |
| 1338 | { |
| 1339 | [DT_RPATH] = true, |
| 1340 | [DT_SYMBOLIC] = true, |
| 1341 | [DT_TEXTREL] = true, |
| 1342 | [DT_BIND_NOW] = true |
| 1343 | }; |
| 1344 | static const bool mandatory[DT_NUM] = |
| 1345 | { |
| 1346 | [DT_NULL] = true, |
| 1347 | [DT_HASH] = true, |
| 1348 | [DT_STRTAB] = true, |
| 1349 | [DT_SYMTAB] = true, |
| 1350 | [DT_STRSZ] = true, |
| 1351 | [DT_SYMENT] = true |
| 1352 | }; |
| 1353 | GElf_Addr reladdr = 0; |
| 1354 | GElf_Word relsz = 0; |
| 1355 | GElf_Addr pltreladdr = 0; |
| 1356 | GElf_Word pltrelsz = 0; |
| 1357 | |
| 1358 | memset (has_dt, '\0', sizeof (has_dt)); |
| 1359 | |
| 1360 | if (++ndynamic == 2) |
| 1361 | ERROR (gettext ("more than one dynamic section present\n")); |
| 1362 | |
| 1363 | scn = elf_getscn (ebl->elf, idx); |
| 1364 | shdr = gelf_getshdr (scn, &shdr_mem); |
| 1365 | if (shdr == NULL) |
| 1366 | return; |
| 1367 | data = elf_getdata (scn, NULL); |
| 1368 | if (data == NULL) |
| 1369 | { |
| 1370 | ERROR (gettext ("section [%2d] '%s': cannot get section data\n"), |
| 1371 | idx, section_name (ebl, idx)); |
| 1372 | return; |
| 1373 | } |
| 1374 | |
| 1375 | strshdr = gelf_getshdr (elf_getscn (ebl->elf, shdr->sh_link), &strshdr_mem); |
| 1376 | if (strshdr != NULL && strshdr->sh_type != SHT_STRTAB) |
| 1377 | ERROR (gettext ("\ |
| 1378 | section [%2d] '%s': referenced as string table for section [%2d] '%s' but type is not SHT_STRTAB\n"), |
| 1379 | shdr->sh_link, section_name (ebl, shdr->sh_link), |
| 1380 | idx, section_name (ebl, idx)); |
| 1381 | |
| 1382 | if (shdr->sh_entsize != gelf_fsize (ebl->elf, ELF_T_DYN, 1, EV_CURRENT)) |
| 1383 | ERROR (gettext ("\ |
| 1384 | section [%2d] '%s': section entry size does not match ElfXX_Dyn\n"), |
| 1385 | idx, section_name (ebl, idx)); |
| 1386 | |
| 1387 | if (shdr->sh_info != 0) |
| 1388 | ERROR (gettext ("section [%2d] '%s': sh_info not zero\n"), |
| 1389 | idx, section_name (ebl, idx)); |
| 1390 | |
| 1391 | bool non_null_warned = false; |
| 1392 | for (cnt = 0; cnt < shdr->sh_size / shdr->sh_entsize; ++cnt) |
| 1393 | { |
| 1394 | GElf_Dyn dyn_mem; |
| 1395 | GElf_Dyn *dyn; |
| 1396 | |
| 1397 | dyn = gelf_getdyn (data, cnt, &dyn_mem); |
| 1398 | if (dyn == NULL) |
| 1399 | { |
| 1400 | ERROR (gettext ("\ |
| 1401 | section [%2d] '%s': cannot get dynamic section entry %zu: %s\n"), |
| 1402 | idx, section_name (ebl, idx), cnt, elf_errmsg (-1)); |
| 1403 | continue; |
| 1404 | } |
| 1405 | |
| 1406 | if (has_dt[DT_NULL] && dyn->d_tag != DT_NULL && ! non_null_warned) |
| 1407 | { |
| 1408 | ERROR (gettext ("\ |
| 1409 | section [%2d] '%s': non-DT_NULL entries follow DT_NULL entry\n"), |
| 1410 | idx, section_name (ebl, idx)); |
| 1411 | non_null_warned = true; |
| 1412 | } |
| 1413 | |
| 1414 | if (!ebl_dynamic_tag_check (ebl, dyn->d_tag)) |
| 1415 | ERROR (gettext ("section [%2d] '%s': entry %zu: unknown tag\n"), |
| 1416 | idx, section_name (ebl, idx), cnt); |
| 1417 | |
| 1418 | if (dyn->d_tag >= 0 && dyn->d_tag < DT_NUM) |
| 1419 | { |
| 1420 | if (has_dt[dyn->d_tag] |
| 1421 | && dyn->d_tag != DT_NEEDED |
| 1422 | && dyn->d_tag != DT_NULL |
| 1423 | && dyn->d_tag != DT_POSFLAG_1) |
| 1424 | { |
| 1425 | char buf[50]; |
| 1426 | ERROR (gettext ("\ |
| 1427 | section [%2d] '%s': entry %zu: more than one entry with tag %s\n"), |
| 1428 | idx, section_name (ebl, idx), cnt, |
| 1429 | ebl_dynamic_tag_name (ebl, dyn->d_tag, |
| 1430 | buf, sizeof (buf))); |
| 1431 | } |
| 1432 | |
| 1433 | if (be_strict && level2[dyn->d_tag]) |
| 1434 | { |
| 1435 | char buf[50]; |
| 1436 | ERROR (gettext ("\ |
| 1437 | section [%2d] '%s': entry %zu: level 2 tag %s used\n"), |
| 1438 | idx, section_name (ebl, idx), cnt, |
| 1439 | ebl_dynamic_tag_name (ebl, dyn->d_tag, |
| 1440 | buf, sizeof (buf))); |
| 1441 | } |
| 1442 | |
| 1443 | has_dt[dyn->d_tag] = true; |
| 1444 | } |
| 1445 | |
| 1446 | if (dyn->d_tag == DT_PLTREL && dyn->d_un.d_val != DT_REL |
| 1447 | && dyn->d_un.d_val != DT_RELA) |
| 1448 | ERROR (gettext ("\ |
| 1449 | section [%2d] '%s': entry %zu: DT_PLTREL value must be DT_REL or DT_RELA\n"), |
| 1450 | idx, section_name (ebl, idx), cnt); |
| 1451 | |
| 1452 | if (dyn->d_tag == DT_REL) |
| 1453 | reladdr = dyn->d_un.d_ptr; |
| 1454 | if (dyn->d_tag == DT_RELSZ) |
| 1455 | relsz = dyn->d_un.d_val; |
| 1456 | if (dyn->d_tag == DT_JMPREL) |
| 1457 | pltreladdr = dyn->d_un.d_ptr; |
| 1458 | if (dyn->d_tag == DT_PLTRELSZ) |
| 1459 | pltrelsz = dyn->d_un.d_val; |
| 1460 | } |
| 1461 | |
| 1462 | for (cnt = 1; cnt < DT_NUM; ++cnt) |
| 1463 | if (has_dt[cnt]) |
| 1464 | { |
| 1465 | int inner; |
| 1466 | |
| 1467 | for (inner = 0; inner < DT_NUM; ++inner) |
| 1468 | if (dependencies[cnt][inner] && ! has_dt[inner]) |
| 1469 | { |
| 1470 | char buf1[50]; |
| 1471 | char buf2[50]; |
| 1472 | |
| 1473 | ERROR (gettext ("\ |
| 1474 | section [%2d] '%s': contains %s entry but not %s\n"), |
| 1475 | idx, section_name (ebl, idx), |
| 1476 | ebl_dynamic_tag_name (ebl, cnt, buf1, sizeof (buf1)), |
| 1477 | ebl_dynamic_tag_name (ebl, inner, buf2, sizeof (buf2))); |
| 1478 | } |
| 1479 | } |
| 1480 | else |
| 1481 | { |
| 1482 | if (mandatory[cnt]) |
| 1483 | { |
| 1484 | char buf[50]; |
| 1485 | ERROR (gettext ("\ |
| 1486 | section [%2d] '%s': mandatory tag %s not present\n"), |
| 1487 | idx, section_name (ebl, idx), |
| 1488 | ebl_dynamic_tag_name (ebl, cnt, buf, sizeof (buf))); |
| 1489 | } |
| 1490 | } |
| 1491 | |
| 1492 | /* Check the rel/rela tags. At least one group must be available. */ |
| 1493 | if ((has_dt[DT_RELA] || has_dt[DT_RELASZ] || has_dt[DT_RELAENT]) |
| 1494 | && (!has_dt[DT_RELA] || !has_dt[DT_RELASZ] || !has_dt[DT_RELAENT])) |
| 1495 | ERROR (gettext ("\ |
| 1496 | section [%2d] '%s': not all of %s, %s, and %s are present\n"), |
| 1497 | idx, section_name (ebl, idx), |
| 1498 | "DT_RELA", "DT_RELASZ", "DT_RELAENT"); |
| 1499 | |
| 1500 | if ((has_dt[DT_REL] || has_dt[DT_RELSZ] || has_dt[DT_RELENT]) |
| 1501 | && (!has_dt[DT_REL] || !has_dt[DT_RELSZ] || !has_dt[DT_RELENT])) |
| 1502 | ERROR (gettext ("\ |
| 1503 | section [%2d] '%s': not all of %s, %s, and %s are present\n"), |
| 1504 | idx, section_name (ebl, idx), |
| 1505 | "DT_REL", "DT_RELSZ", "DT_RELENT"); |
| 1506 | } |
| 1507 | |
| 1508 | |
| 1509 | static void |
| 1510 | check_symtab_shndx (Ebl *ebl, int idx) |
| 1511 | { |
| 1512 | Elf_Scn *scn; |
| 1513 | GElf_Shdr shdr_mem; |
| 1514 | GElf_Shdr *shdr; |
| 1515 | GElf_Shdr symshdr_mem; |
| 1516 | GElf_Shdr *symshdr; |
| 1517 | Elf_Scn *symscn; |
| 1518 | size_t cnt; |
| 1519 | Elf_Data *data; |
| 1520 | Elf_Data *symdata; |
| 1521 | |
| 1522 | scn = elf_getscn (ebl->elf, idx); |
| 1523 | shdr = gelf_getshdr (scn, &shdr_mem); |
| 1524 | if (shdr == NULL) |
| 1525 | return; |
| 1526 | |
| 1527 | symscn = elf_getscn (ebl->elf, shdr->sh_link); |
| 1528 | symshdr = gelf_getshdr (symscn, &symshdr_mem); |
| 1529 | if (symshdr != NULL && symshdr->sh_type != SHT_SYMTAB) |
| 1530 | ERROR (gettext ("\ |
| 1531 | section [%2d] '%s': extended section index section not for symbol table\n"), |
| 1532 | idx, section_name (ebl, idx)); |
| 1533 | symdata = elf_getdata (symscn, NULL); |
| 1534 | if (symdata == NULL) |
| 1535 | ERROR (gettext ("cannot get data for symbol section\n")); |
| 1536 | |
| 1537 | if (shdr->sh_entsize != sizeof (Elf32_Word)) |
| 1538 | ERROR (gettext ("\ |
| 1539 | section [%2d] '%s': entry size does not match Elf32_Word\n"), |
| 1540 | idx, section_name (ebl, idx)); |
| 1541 | |
| 1542 | if (symshdr != NULL |
| 1543 | && (shdr->sh_size / shdr->sh_entsize |
| 1544 | < symshdr->sh_size / symshdr->sh_entsize)) |
| 1545 | ERROR (gettext ("\ |
| 1546 | section [%2d] '%s': extended index table too small for symbol table\n"), |
| 1547 | idx, section_name (ebl, idx)); |
| 1548 | |
| 1549 | if (shdr->sh_info != 0) |
| 1550 | ERROR (gettext ("section [%2d] '%s': sh_info not zero\n"), |
| 1551 | idx, section_name (ebl, idx)); |
| 1552 | |
| 1553 | for (cnt = idx + 1; cnt < shnum; ++cnt) |
| 1554 | { |
| 1555 | GElf_Shdr rshdr_mem; |
| 1556 | GElf_Shdr *rshdr; |
| 1557 | |
| 1558 | rshdr = gelf_getshdr (elf_getscn (ebl->elf, cnt), &rshdr_mem); |
| 1559 | if (rshdr != NULL && rshdr->sh_type == SHT_SYMTAB_SHNDX |
| 1560 | && rshdr->sh_link == shdr->sh_link) |
| 1561 | { |
| 1562 | ERROR (gettext ("\ |
| 1563 | section [%2d] '%s': extended section index in section [%2zu] '%s' refers to same symbol table\n"), |
| 1564 | idx, section_name (ebl, idx), |
| 1565 | cnt, section_name (ebl, cnt)); |
| 1566 | break; |
| 1567 | } |
| 1568 | } |
| 1569 | |
| 1570 | data = elf_getdata (scn, NULL); |
| 1571 | |
| 1572 | if (*((Elf32_Word *) data->d_buf) != 0) |
| 1573 | ERROR (gettext ("symbol 0 should have zero extended section index\n")); |
| 1574 | |
| 1575 | for (cnt = 1; cnt < data->d_size / sizeof (Elf32_Word); ++cnt) |
| 1576 | { |
| 1577 | Elf32_Word xndx = ((Elf32_Word *) data->d_buf)[cnt]; |
| 1578 | |
| 1579 | if (xndx != 0) |
| 1580 | { |
| 1581 | GElf_Sym sym_data; |
| 1582 | GElf_Sym *sym = gelf_getsym (symdata, cnt, &sym_data); |
| 1583 | if (sym == NULL) |
| 1584 | { |
| 1585 | ERROR (gettext ("cannot get data for symbol %zu\n"), cnt); |
| 1586 | continue; |
| 1587 | } |
| 1588 | |
| 1589 | if (sym->st_shndx != SHN_XINDEX) |
| 1590 | ERROR (gettext ("\ |
| 1591 | extended section index is %" PRIu32 " but symbol index is not XINDEX\n"), |
| 1592 | (uint32_t) xndx); |
| 1593 | } |
| 1594 | } |
| 1595 | } |
| 1596 | |
| 1597 | |
| 1598 | static void |
| 1599 | check_hash (Ebl *ebl, int idx) |
| 1600 | { |
| 1601 | Elf_Scn *scn; |
| 1602 | GElf_Shdr shdr_mem; |
| 1603 | GElf_Shdr *shdr; |
| 1604 | Elf_Data *data; |
| 1605 | Elf32_Word nbucket; |
| 1606 | Elf32_Word nchain; |
| 1607 | GElf_Shdr symshdr_mem; |
| 1608 | GElf_Shdr *symshdr; |
| 1609 | |
| 1610 | scn = elf_getscn (ebl->elf, idx); |
| 1611 | shdr = gelf_getshdr (scn, &shdr_mem); |
| 1612 | if (shdr == NULL) |
| 1613 | return; |
| 1614 | data = elf_getdata (scn, NULL); |
| 1615 | if (data == NULL) |
| 1616 | { |
| 1617 | ERROR (gettext ("section [%2d] '%s': cannot get section data\n"), |
| 1618 | idx, section_name (ebl, idx)); |
| 1619 | return; |
| 1620 | } |
| 1621 | |
| 1622 | symshdr = gelf_getshdr (elf_getscn (ebl->elf, shdr->sh_link), &symshdr_mem); |
| 1623 | if (symshdr != NULL && symshdr->sh_type != SHT_DYNSYM) |
| 1624 | ERROR (gettext ("\ |
| 1625 | section [%2d] '%s': hash table not for dynamic symbol table\n"), |
| 1626 | idx, section_name (ebl, idx)); |
| 1627 | |
| 1628 | if (shdr->sh_entsize != sizeof (Elf32_Word)) |
| 1629 | ERROR (gettext ("\ |
| 1630 | section [%2d] '%s': entry size does not match Elf32_Word\n"), |
| 1631 | idx, section_name (ebl, idx)); |
| 1632 | |
| 1633 | if ((shdr->sh_flags & SHF_ALLOC) == 0) |
| 1634 | ERROR (gettext ("section [%2d] '%s': not marked to be allocated\n"), |
| 1635 | idx, section_name (ebl, idx)); |
| 1636 | |
| 1637 | if (shdr->sh_size < 2 * shdr->sh_entsize) |
| 1638 | { |
| 1639 | ERROR (gettext ("\ |
| 1640 | section [%2d] '%s': hash table has not even room for nbucket and nchain\n"), |
| 1641 | idx, section_name (ebl, idx)); |
| 1642 | return; |
| 1643 | } |
| 1644 | |
| 1645 | nbucket = ((Elf32_Word *) data->d_buf)[0]; |
| 1646 | nchain = ((Elf32_Word *) data->d_buf)[1]; |
| 1647 | |
| 1648 | if (shdr->sh_size < (2 + nbucket + nchain) * shdr->sh_entsize) |
| 1649 | ERROR (gettext ("\ |
| 1650 | section [%2d] '%s': hash table section is too small (is %ld, expected %ld)\n"), |
| 1651 | idx, section_name (ebl, idx), (long int) shdr->sh_size, |
| 1652 | (long int) ((2 + nbucket + nchain) * shdr->sh_entsize)); |
| 1653 | |
| 1654 | if (symshdr != NULL) |
| 1655 | { |
| 1656 | size_t symsize = symshdr->sh_size / symshdr->sh_entsize; |
| 1657 | size_t cnt; |
| 1658 | |
| 1659 | if (nchain < symshdr->sh_size / symshdr->sh_entsize) |
| 1660 | ERROR (gettext ("section [%2d] '%s': chain array not large enough\n"), |
| 1661 | idx, section_name (ebl, idx)); |
| 1662 | |
| 1663 | for (cnt = 2; cnt < 2 + nbucket; ++cnt) |
| 1664 | if (((Elf32_Word *) data->d_buf)[cnt] >= symsize) |
| 1665 | ERROR (gettext ("\ |
| 1666 | section [%2d] '%s': hash bucket reference %zu out of bounds\n"), |
| 1667 | idx, section_name (ebl, idx), cnt - 2); |
| 1668 | |
| 1669 | for (; cnt < 2 + nbucket + nchain; ++cnt) |
| 1670 | if (((Elf32_Word *) data->d_buf)[cnt] >= symsize) |
| 1671 | ERROR (gettext ("\ |
| 1672 | section [%2d] '%s': hash chain reference %zu out of bounds\n"), |
| 1673 | idx, section_name (ebl, idx), cnt - 2 - nbucket); |
| 1674 | } |
| 1675 | } |
| 1676 | |
| 1677 | |
| 1678 | static void |
| 1679 | check_null (Ebl *ebl, GElf_Shdr *shdr, int idx) |
| 1680 | { |
| 1681 | #define TEST(name, extra) \ |
| 1682 | if (extra && shdr->sh_##name != 0) \ |
| 1683 | ERROR (gettext ("section [%2d] '%s': nonzero sh_%s for NULL section\n"), \ |
| 1684 | idx, section_name (ebl, idx), #name) |
| 1685 | |
| 1686 | TEST (name, 1); |
| 1687 | TEST (flags, 1); |
| 1688 | TEST (addr, 1); |
| 1689 | TEST (offset, 1); |
| 1690 | TEST (size, idx != 0); |
| 1691 | TEST (link, idx != 0); |
| 1692 | TEST (info, 1); |
| 1693 | TEST (addralign, 1); |
| 1694 | TEST (entsize, 1); |
| 1695 | } |
| 1696 | |
| 1697 | |
| 1698 | static void |
| 1699 | check_group (Ebl *ebl, GElf_Ehdr *ehdr, GElf_Shdr *shdr, int idx) |
| 1700 | { |
| 1701 | if (ehdr->e_type != ET_REL) |
| 1702 | { |
| 1703 | ERROR (gettext ("\ |
| 1704 | section [%2d] '%s': section groups only allowed in relocatable object files\n"), |
| 1705 | idx, section_name (ebl, idx)); |
| 1706 | return; |
| 1707 | } |
| 1708 | |
| 1709 | /* Check that sh_link is an index of a symbol table. */ |
| 1710 | GElf_Shdr symshdr_mem; |
| 1711 | GElf_Shdr *symshdr = gelf_getshdr (elf_getscn (ebl->elf, shdr->sh_link), |
| 1712 | &symshdr_mem); |
| 1713 | if (symshdr == NULL) |
| 1714 | ERROR (gettext ("section [%2d] '%s': cannot get symbol table: %s\n"), |
| 1715 | idx, section_name (ebl, idx), elf_errmsg (-1)); |
| 1716 | else |
| 1717 | { |
| 1718 | if (symshdr->sh_type != SHT_SYMTAB) |
| 1719 | ERROR (gettext ("\ |
| 1720 | section [%2d] '%s': section reference in sh_link is no symbol table\n"), |
| 1721 | idx, section_name (ebl, idx)); |
| 1722 | |
| 1723 | if (shdr->sh_info >= symshdr->sh_size / gelf_fsize (ebl->elf, ELF_T_SYM, |
| 1724 | 1, EV_CURRENT)) |
| 1725 | ERROR (gettext ("\ |
| 1726 | section [%2d] '%s': invalid symbol index in sh_info\n"), |
| 1727 | idx, section_name (ebl, idx)); |
| 1728 | |
| 1729 | if (shdr->sh_flags != 0) |
| 1730 | ERROR (gettext ("section [%2d] '%s': sh_flags not zero\n"), |
| 1731 | idx, section_name (ebl, idx)); |
| 1732 | |
| 1733 | if (be_strict |
| 1734 | && shdr->sh_entsize != elf32_fsize (ELF_T_WORD, 1, EV_CURRENT)) |
| 1735 | ERROR (gettext ("section [%2d] '%s': sh_flags not set correctly\n"), |
| 1736 | idx, section_name (ebl, idx)); |
| 1737 | } |
| 1738 | |
| 1739 | Elf_Data *data = elf_getdata (elf_getscn (ebl->elf, idx), NULL); |
| 1740 | if (data == NULL) |
| 1741 | ERROR (gettext ("section [%2d] '%s': cannot get data: %s\n"), |
| 1742 | idx, section_name (ebl, idx), elf_errmsg (-1)); |
| 1743 | else |
| 1744 | { |
| 1745 | size_t elsize = elf32_fsize (ELF_T_WORD, 1, EV_CURRENT); |
| 1746 | size_t cnt; |
| 1747 | Elf32_Word val; |
| 1748 | |
| 1749 | if (data->d_size % elsize != 0) |
| 1750 | ERROR (gettext ("\ |
| 1751 | section [%2d] '%s': section size not multiple of sizeof(Elf32_Word)\n"), |
| 1752 | idx, section_name (ebl, idx)); |
| 1753 | |
| 1754 | if (data->d_size < elsize) |
| 1755 | ERROR (gettext ("\ |
| 1756 | section [%2d] '%s': section group without flags word\n"), |
| 1757 | idx, section_name (ebl, idx)); |
| 1758 | else if (be_strict) |
| 1759 | { |
| 1760 | if (data->d_size < 2 * elsize) |
| 1761 | ERROR (gettext ("\ |
| 1762 | section [%2d] '%s': section group without member\n"), |
| 1763 | idx, section_name (ebl, idx)); |
| 1764 | else if (data->d_size < 3 * elsize) |
| 1765 | ERROR (gettext ("\ |
| 1766 | section [%2d] '%s': section group with only one member\n"), |
| 1767 | idx, section_name (ebl, idx)); |
| 1768 | } |
| 1769 | |
| 1770 | #if ALLOW_UNALIGNED |
| 1771 | val = *((Elf32_Word *) data->d_buf); |
| 1772 | #else |
| 1773 | memcpy (&val, data->d_buf, elsize); |
| 1774 | #endif |
| 1775 | if ((val & ~GRP_COMDAT) != 0) |
| 1776 | ERROR (gettext ("section [%2d] '%s': unknown section group flags\n"), |
| 1777 | idx, section_name (ebl, idx)); |
| 1778 | |
| 1779 | for (cnt = elsize; cnt < data->d_size; cnt += elsize) |
| 1780 | { |
| 1781 | #if ALLOW_UNALIGNED |
| 1782 | val = *((Elf32_Word *) ((char *) data->d_buf + cnt)); |
| 1783 | #else |
| 1784 | memcpy (&val, (char *) data->d_buf + cnt, elsize); |
| 1785 | #endif |
| 1786 | |
| 1787 | if (val > shnum) |
| 1788 | ERROR (gettext ("\ |
| 1789 | section [%2d] '%s': section index %Zu out of range\n"), |
| 1790 | idx, section_name (ebl, idx), cnt / elsize); |
| 1791 | else |
| 1792 | { |
| 1793 | GElf_Shdr refshdr_mem; |
| 1794 | GElf_Shdr *refshdr; |
| 1795 | |
| 1796 | refshdr = gelf_getshdr (elf_getscn (ebl->elf, val), |
| 1797 | &refshdr_mem); |
| 1798 | if (refshdr == NULL) |
| 1799 | ERROR (gettext ("\ |
| 1800 | section [%2d] '%s': cannot get section header for element %zu: %s\n"), |
| 1801 | idx, section_name (ebl, idx), cnt / elsize, |
| 1802 | elf_errmsg (-1)); |
| 1803 | else |
| 1804 | { |
| 1805 | if (refshdr->sh_type == SHT_GROUP) |
| 1806 | ERROR (gettext ("\ |
| 1807 | section [%2d] '%s': section group contains another group [%2d] '%s'\n"), |
| 1808 | idx, section_name (ebl, idx), |
| 1809 | val, section_name (ebl, val)); |
| 1810 | |
| 1811 | if ((refshdr->sh_flags & SHF_GROUP) == 0) |
| 1812 | ERROR (gettext ("\ |
| 1813 | section [%2d] '%s': element %Zu references section [%2d] '%s' without SHF_GROUP flag set\n"), |
| 1814 | idx, section_name (ebl, idx), cnt / elsize, |
| 1815 | val, section_name (ebl, val)); |
| 1816 | } |
| 1817 | |
| 1818 | if (++scnref[val] == 2) |
| 1819 | ERROR (gettext ("\ |
| 1820 | section [%2d] '%s' is contained in more than one section group\n"), |
| 1821 | val, section_name (ebl, val)); |
| 1822 | } |
| 1823 | } |
| 1824 | } |
| 1825 | } |
| 1826 | |
| 1827 | |
| 1828 | static bool has_loadable_segment; |
| 1829 | static bool has_interp_segment; |
| 1830 | |
| 1831 | static const struct |
| 1832 | { |
| 1833 | const char *name; |
| 1834 | size_t namelen; |
| 1835 | GElf_Word type; |
| 1836 | enum { unused, exact, atleast } attrflag; |
| 1837 | GElf_Word attr; |
| 1838 | GElf_Word attr2; |
| 1839 | } special_sections[] = |
| 1840 | { |
| 1841 | /* See figure 4-14 in the gABI. */ |
| 1842 | { ".bss", 5, SHT_NOBITS, exact, SHF_ALLOC | SHF_WRITE, 0 }, |
| 1843 | { ".comment", 8, SHT_PROGBITS, exact, 0, 0 }, |
| 1844 | { ".data", 6, SHT_PROGBITS, exact, SHF_ALLOC | SHF_WRITE, 0 }, |
| 1845 | { ".data1", 7, SHT_PROGBITS, exact, SHF_ALLOC | SHF_WRITE, 0 }, |
| 1846 | { ".debug", 7, SHT_PROGBITS, exact, 0, 0 }, |
| 1847 | { ".dynamic", 9, SHT_DYNAMIC, atleast, SHF_ALLOC, SHF_WRITE }, |
| 1848 | { ".dynstr", 8, SHT_STRTAB, exact, SHF_ALLOC, 0 }, |
| 1849 | { ".dynsym", 8, SHT_DYNSYM, exact, SHF_ALLOC, 0 }, |
| 1850 | { ".fini", 6, SHT_PROGBITS, exact, SHF_ALLOC | SHF_EXECINSTR, 0 }, |
| 1851 | { ".fini_array", 12, SHT_FINI_ARRAY, exact, SHF_ALLOC | SHF_WRITE, 0 }, |
| 1852 | { ".got", 5, SHT_PROGBITS, unused, 0, 0 }, // XXX more info? |
| 1853 | { ".hash", 6, SHT_HASH, exact, SHF_ALLOC, 0 }, |
| 1854 | { ".init", 6, SHT_PROGBITS, exact, SHF_ALLOC | SHF_EXECINSTR, 0 }, |
| 1855 | { ".init_array", 12, SHT_INIT_ARRAY, exact, SHF_ALLOC | SHF_WRITE, 0 }, |
| 1856 | { ".interp", 8, SHT_PROGBITS, atleast, 0, SHF_ALLOC }, // XXX more tests? |
| 1857 | { ".line", 6, SHT_PROGBITS, exact, 0, 0 }, |
| 1858 | { ".note", 6, SHT_NOTE, exact, 0, 0 }, |
| 1859 | { ".plt", 5, SHT_PROGBITS, unused, 0, 0 }, // XXX more tests |
| 1860 | { ".preinit_array", 15, SHT_PREINIT_ARRAY, exact, SHF_ALLOC | SHF_WRITE, 0 }, |
| 1861 | { ".rela", 5, SHT_RELA, atleast, 0, SHF_ALLOC }, // XXX more tests |
| 1862 | { ".rel", 4, SHT_REL, atleast, 0, SHF_ALLOC }, // XXX more tests |
| 1863 | { ".rodata", 8, SHT_PROGBITS, exact, SHF_ALLOC, 0 }, |
| 1864 | { ".rodata1", 9, SHT_PROGBITS, exact, SHF_ALLOC, 0 }, |
| 1865 | { ".shstrtab", 10, SHT_STRTAB, exact, 0, 0 }, |
| 1866 | { ".strtab", 8, SHT_STRTAB, atleast, 0, SHF_ALLOC }, // XXX more tests |
| 1867 | { ".symtab", 8, SHT_SYMTAB, atleast, 0, SHF_ALLOC }, // XXX more tests |
| 1868 | { ".symtab_shndx", 14, SHT_SYMTAB_SHNDX, atleast, 0, SHF_ALLOC }, // XXX more tests |
| 1869 | { ".tbss", 6, SHT_NOBITS, exact, SHF_ALLOC | SHF_WRITE | SHF_TLS, 0 }, |
| 1870 | { ".tdata", 7, SHT_PROGBITS, exact, SHF_ALLOC | SHF_WRITE | SHF_TLS, 0 }, |
| 1871 | { ".tdata1", 8, SHT_PROGBITS, exact, SHF_ALLOC | SHF_WRITE | SHF_TLS, 0 }, |
| 1872 | { ".text", 6, SHT_PROGBITS, exact, SHF_ALLOC | SHF_EXECINSTR, 0 } |
| 1873 | }; |
| 1874 | #define nspecial_sections \ |
| 1875 | (sizeof (special_sections) / sizeof (special_sections[0])) |
| 1876 | |
| 1877 | |
| 1878 | static const char * |
| 1879 | section_flags_string (GElf_Word flags, char *buf, size_t len) |
| 1880 | { |
| 1881 | static const struct |
| 1882 | { |
| 1883 | GElf_Word flag; |
| 1884 | const char *name; |
| 1885 | } known_flags[] = |
| 1886 | { |
| 1887 | #define NEWFLAG(name) { SHF_##name, #name } |
| 1888 | NEWFLAG (WRITE), |
| 1889 | NEWFLAG (ALLOC), |
| 1890 | NEWFLAG (EXECINSTR), |
| 1891 | NEWFLAG (MERGE), |
| 1892 | NEWFLAG (STRINGS), |
| 1893 | NEWFLAG (INFO_LINK), |
| 1894 | NEWFLAG (LINK_ORDER), |
| 1895 | NEWFLAG (OS_NONCONFORMING), |
| 1896 | NEWFLAG (GROUP), |
| 1897 | NEWFLAG (TLS) |
| 1898 | }; |
| 1899 | #undef NEWFLAG |
| 1900 | const size_t nknown_flags = sizeof (known_flags) / sizeof (known_flags[0]); |
| 1901 | |
| 1902 | char *cp = buf; |
| 1903 | size_t cnt; |
| 1904 | |
| 1905 | for (cnt = 0; cnt < nknown_flags; ++cnt) |
| 1906 | if (flags & known_flags[cnt].flag) |
| 1907 | { |
| 1908 | if (cp != buf && len > 1) |
| 1909 | { |
| 1910 | *cp++ = '|'; |
| 1911 | --len; |
| 1912 | } |
| 1913 | |
| 1914 | size_t ncopy = MIN (len - 1, strlen (known_flags[cnt].name)); |
| 1915 | cp = mempcpy (cp, known_flags[cnt].name, ncopy); |
| 1916 | len -= ncopy; |
| 1917 | |
| 1918 | flags ^= known_flags[cnt].flag; |
| 1919 | } |
| 1920 | |
| 1921 | if (flags != 0 || cp == buf) |
| 1922 | snprintf (cp, len - 1, "%" PRIx64, (uint64_t) flags); |
| 1923 | |
| 1924 | *cp = '\0'; |
| 1925 | |
| 1926 | return buf; |
| 1927 | } |
| 1928 | |
| 1929 | |
| 1930 | static void |
| 1931 | check_versym (Ebl *ebl, GElf_Shdr *shdr, int idx) |
| 1932 | { |
| 1933 | /* The number of elements in the version symbol table must be the |
| 1934 | same as the number of symbols. */ |
| 1935 | GElf_Shdr symshdr_mem; |
| 1936 | GElf_Shdr *symshdr = gelf_getshdr (elf_getscn (ebl->elf, shdr->sh_link), |
| 1937 | &symshdr_mem); |
| 1938 | if (symshdr == NULL) |
| 1939 | /* The error has already been reported. */ |
| 1940 | return; |
| 1941 | |
| 1942 | if (symshdr->sh_type != SHT_DYNSYM) |
| 1943 | { |
| 1944 | ERROR (gettext ("\ |
| 1945 | section [%2d] '%s' refers in sh_link to section [%2d] '%s' which is no dynamic symbol table\n"), |
| 1946 | idx, section_name (ebl, idx), |
| 1947 | shdr->sh_link, section_name (ebl, shdr->sh_link)); |
| 1948 | return; |
| 1949 | } |
| 1950 | |
| 1951 | if (shdr->sh_size / shdr->sh_entsize |
| 1952 | != symshdr->sh_size / symshdr->sh_entsize) |
| 1953 | ERROR (gettext ("\ |
| 1954 | section [%2d] '%s' has different number of entries than symbol table [%2d] '%s'\n"), |
| 1955 | idx, section_name (ebl, idx), |
| 1956 | shdr->sh_link, section_name (ebl, shdr->sh_link)); |
| 1957 | |
| 1958 | // XXX TODO A lot more tests |
| 1959 | // check value of the fields. local symbols must have zero entries. |
| 1960 | // nonlocal symbols refer to valid version. Check that version index |
| 1961 | // in bound. |
| 1962 | } |
| 1963 | |
| 1964 | |
| 1965 | static void |
| 1966 | check_sections (Ebl *ebl, GElf_Ehdr *ehdr) |
| 1967 | { |
| 1968 | GElf_Shdr shdr_mem; |
| 1969 | GElf_Shdr *shdr; |
| 1970 | size_t cnt; |
| 1971 | bool dot_interp_section = false; |
| 1972 | |
| 1973 | if (ehdr->e_shoff == 0) |
| 1974 | /* No section header. */ |
| 1975 | return; |
| 1976 | |
| 1977 | /* Allocate array to count references in section groups. */ |
| 1978 | scnref = (int *) xcalloc (shnum, sizeof (int)); |
| 1979 | |
| 1980 | /* Check the zeroth section first. It must not have any contents |
| 1981 | and the section header must contain nonzero value at most in the |
| 1982 | sh_size and sh_link fields. */ |
| 1983 | shdr = gelf_getshdr (elf_getscn (ebl->elf, 0), &shdr_mem); |
| 1984 | if (shdr == NULL) |
| 1985 | ERROR (gettext ("cannot get section header of zeroth section\n")); |
| 1986 | else |
| 1987 | { |
| 1988 | if (shdr->sh_name != 0) |
| 1989 | ERROR (gettext ("zeroth section has nonzero name\n")); |
| 1990 | if (shdr->sh_type != 0) |
| 1991 | ERROR (gettext ("zeroth section has nonzero type\n")); |
| 1992 | if (shdr->sh_flags != 0) |
| 1993 | ERROR (gettext ("zeroth section has nonzero flags\n")); |
| 1994 | if (shdr->sh_addr != 0) |
| 1995 | ERROR (gettext ("zeroth section has nonzero address\n")); |
| 1996 | if (shdr->sh_offset != 0) |
| 1997 | ERROR (gettext ("zeroth section has nonzero offset\n")); |
| 1998 | if (shdr->sh_info != 0) |
| 1999 | ERROR (gettext ("zeroth section has nonzero info field\n")); |
| 2000 | if (shdr->sh_addralign != 0) |
| 2001 | ERROR (gettext ("zeroth section has nonzero align value\n")); |
| 2002 | if (shdr->sh_entsize != 0) |
| 2003 | ERROR (gettext ("zeroth section has nonzero entry size value\n")); |
| 2004 | |
| 2005 | if (shdr->sh_size != 0 && ehdr->e_shnum != 0) |
| 2006 | ERROR (gettext ("\ |
| 2007 | zeroth section has nonzero size value while ELF header has nonzero shnum value\n")); |
| 2008 | |
| 2009 | if (shdr->sh_link != 0 && ehdr->e_shstrndx != SHN_XINDEX) |
| 2010 | ERROR (gettext ("\ |
| 2011 | zeroth section has nonzero link value while ELF header does not signal overflow in shstrndx\n")); |
| 2012 | } |
| 2013 | |
| 2014 | for (cnt = 1; cnt < shnum; ++cnt) |
| 2015 | { |
| 2016 | Elf_Scn *scn; |
| 2017 | |
| 2018 | scn = elf_getscn (ebl->elf, cnt); |
| 2019 | shdr = gelf_getshdr (scn, &shdr_mem); |
| 2020 | if (shdr == NULL) |
| 2021 | { |
| 2022 | ERROR (gettext ("\ |
| 2023 | cannot get section header for section [%2zu] '%s': %s\n"), |
| 2024 | cnt, section_name (ebl, cnt), elf_errmsg (-1)); |
| 2025 | continue; |
| 2026 | } |
| 2027 | |
| 2028 | const char *scnname = elf_strptr (ebl->elf, shstrndx, shdr->sh_name); |
| 2029 | |
| 2030 | if (scnname == NULL) |
| 2031 | ERROR (gettext ("section [%2zu]: invalid name\n"), cnt); |
| 2032 | else |
| 2033 | { |
| 2034 | /* Check whether it is one of the special sections defined in |
| 2035 | the gABI. */ |
| 2036 | size_t s; |
| 2037 | for (s = 0; s < nspecial_sections; ++s) |
| 2038 | if (strncmp (scnname, special_sections[s].name, |
| 2039 | special_sections[s].namelen) == 0) |
| 2040 | { |
| 2041 | char stbuf1[100]; |
| 2042 | char stbuf2[100]; |
| 2043 | char stbuf3[100]; |
| 2044 | |
| 2045 | if (shdr->sh_type != special_sections[s].type |
| 2046 | && !(is_debuginfo && shdr->sh_type == SHT_NOBITS)) |
| 2047 | ERROR (gettext ("\ |
| 2048 | section [%2d] '%s' has wrong type: expected %s, is %s\n"), |
| 2049 | (int) cnt, scnname, |
| 2050 | ebl_section_type_name (ebl, special_sections[s].type, |
| 2051 | stbuf1, sizeof (stbuf1)), |
| 2052 | ebl_section_type_name (ebl, shdr->sh_type, |
| 2053 | stbuf2, sizeof (stbuf2))); |
| 2054 | |
| 2055 | if (special_sections[s].attrflag == exact) |
| 2056 | { |
| 2057 | /* Except for the link order and group bit all the |
| 2058 | other bits should match exactly. */ |
| 2059 | if ((shdr->sh_flags & ~(SHF_LINK_ORDER | SHF_GROUP)) |
| 2060 | != special_sections[s].attr) |
| 2061 | ERROR (gettext ("\ |
| 2062 | section [%2zu] '%s' has wrong flags: expected %s, is %s\n"), |
| 2063 | cnt, scnname, |
| 2064 | section_flags_string (special_sections[s].attr, |
| 2065 | stbuf1, sizeof (stbuf1)), |
| 2066 | section_flags_string (shdr->sh_flags |
| 2067 | & ~SHF_LINK_ORDER, |
| 2068 | stbuf2, sizeof (stbuf2))); |
| 2069 | } |
| 2070 | else if (special_sections[s].attrflag == atleast) |
| 2071 | { |
| 2072 | if ((shdr->sh_flags & special_sections[s].attr) |
| 2073 | != special_sections[s].attr |
| 2074 | || ((shdr->sh_flags & ~(SHF_LINK_ORDER | SHF_GROUP |
| 2075 | | special_sections[s].attr |
| 2076 | | special_sections[s].attr2)) |
| 2077 | != 0)) |
| 2078 | ERROR (gettext ("\ |
| 2079 | section [%2zu] '%s' has wrong flags: expected %s and possibly %s, is %s\n"), |
| 2080 | cnt, scnname, |
| 2081 | section_flags_string (special_sections[s].attr, |
| 2082 | stbuf1, sizeof (stbuf1)), |
| 2083 | section_flags_string (special_sections[s].attr2, |
| 2084 | stbuf2, sizeof (stbuf2)), |
| 2085 | section_flags_string (shdr->sh_flags |
| 2086 | & ~(SHF_LINK_ORDER |
| 2087 | | SHF_GROUP), |
| 2088 | stbuf3, sizeof (stbuf3))); |
| 2089 | } |
| 2090 | |
| 2091 | if (strcmp (scnname, ".interp") == 0) |
| 2092 | { |
| 2093 | dot_interp_section = true; |
| 2094 | |
| 2095 | if (ehdr->e_type == ET_REL) |
| 2096 | ERROR (gettext ("\ |
| 2097 | section [%2zu] '%s' present in object file\n"), |
| 2098 | cnt, scnname); |
| 2099 | |
| 2100 | if ((shdr->sh_flags & SHF_ALLOC) != 0 |
| 2101 | && !has_loadable_segment) |
| 2102 | ERROR (gettext ("\ |
| 2103 | section [%2zu] '%s' has SHF_ALLOC flag set but there is no loadable segment\n"), |
| 2104 | cnt, scnname); |
| 2105 | else if ((shdr->sh_flags & SHF_ALLOC) == 0 |
| 2106 | && has_loadable_segment) |
| 2107 | ERROR (gettext ("\ |
| 2108 | section [%2zu] '%s' has SHF_ALLOC flag not set but there are loadable segments\n"), |
| 2109 | cnt, scnname); |
| 2110 | } |
| 2111 | else |
| 2112 | { |
| 2113 | if (strcmp (scnname, ".symtab_shndx") == 0 |
| 2114 | && ehdr->e_type != ET_REL) |
| 2115 | ERROR (gettext ("\ |
| 2116 | section [%2zu] '%s' is extension section index table in non-object file\n"), |
| 2117 | cnt, scnname); |
| 2118 | |
| 2119 | /* These sections must have the SHF_ALLOC flag set iff |
| 2120 | a loadable segment is available. |
| 2121 | |
| 2122 | .relxxx |
| 2123 | .strtab |
| 2124 | .symtab |
| 2125 | .symtab_shndx |
| 2126 | |
| 2127 | Check that if there is a reference from the |
| 2128 | loaded section these sections also have the |
| 2129 | ALLOC flag set. */ |
| 2130 | #if 0 |
| 2131 | // XXX TODO |
| 2132 | if ((shdr->sh_flags & SHF_ALLOC) != 0 |
| 2133 | && !has_loadable_segment) |
| 2134 | ERROR (gettext ("\ |
| 2135 | section [%2zu] '%s' has SHF_ALLOC flag set but there is no loadable segment\n"), |
| 2136 | cnt, scnname); |
| 2137 | else if ((shdr->sh_flags & SHF_ALLOC) == 0 |
| 2138 | && has_loadable_segment) |
| 2139 | ERROR (gettext ("\ |
| 2140 | section [%2zu] '%s' has SHF_ALLOC flag not set but there are loadable segments\n"), |
| 2141 | cnt, scnname); |
| 2142 | #endif |
| 2143 | } |
| 2144 | |
| 2145 | break; |
| 2146 | } |
| 2147 | } |
| 2148 | |
| 2149 | if (shdr->sh_entsize != 0 && shdr->sh_size % shdr->sh_entsize) |
| 2150 | ERROR (gettext ("\ |
| 2151 | section [%2zu] '%s': size not multiple of entry size\n"), |
| 2152 | cnt, section_name (ebl, cnt)); |
| 2153 | |
| 2154 | if (elf_strptr (ebl->elf, shstrndx, shdr->sh_name) == NULL) |
| 2155 | ERROR (gettext ("cannot get section header\n")); |
| 2156 | |
| 2157 | if (shdr->sh_type >= SHT_NUM |
| 2158 | && shdr->sh_type != SHT_GNU_LIBLIST |
| 2159 | && shdr->sh_type != SHT_CHECKSUM |
| 2160 | && shdr->sh_type != SHT_GNU_verdef |
| 2161 | && shdr->sh_type != SHT_GNU_verneed |
| 2162 | && shdr->sh_type != SHT_GNU_versym) |
| 2163 | ERROR (gettext ("unsupported section type %d\n"), (int) shdr->sh_type); |
| 2164 | |
| 2165 | #define ALL_SH_FLAGS (SHF_WRITE | SHF_ALLOC | SHF_EXECINSTR | SHF_MERGE \ |
| 2166 | | SHF_STRINGS | SHF_INFO_LINK | SHF_LINK_ORDER \ |
| 2167 | | SHF_OS_NONCONFORMING | SHF_GROUP | SHF_TLS) |
| 2168 | if (shdr->sh_flags & ~ALL_SH_FLAGS) |
| 2169 | ERROR (gettext ("section [%2zu] '%s' contain unknown flag(s) %d\n"), |
| 2170 | cnt, section_name (ebl, cnt), |
| 2171 | (int) shdr->sh_flags & ~ALL_SH_FLAGS); |
| 2172 | else if (shdr->sh_flags & SHF_TLS) |
| 2173 | { |
| 2174 | // XXX Correct? |
| 2175 | if (shdr->sh_addr != 0 && !gnuld) |
| 2176 | ERROR (gettext ("\ |
| 2177 | section [%2zu] '%s': thread-local data sections address not zero\n"), |
| 2178 | cnt, section_name (ebl, cnt)); |
| 2179 | |
| 2180 | // XXX TODO more tests!? |
| 2181 | } |
| 2182 | |
| 2183 | if (shdr->sh_link >= shnum) |
| 2184 | ERROR (gettext ("\ |
| 2185 | section [%2zu] '%s': invalid section reference in link value\n"), |
| 2186 | cnt, section_name (ebl, cnt)); |
| 2187 | |
| 2188 | if (SH_INFO_LINK_P (shdr) && shdr->sh_info >= shnum) |
| 2189 | ERROR (gettext ("\ |
| 2190 | section [%2zu] '%s': invalid section reference in info value\n"), |
| 2191 | cnt, section_name (ebl, cnt)); |
| 2192 | |
| 2193 | if ((shdr->sh_flags & SHF_MERGE) == 0 |
| 2194 | && (shdr->sh_flags & SHF_STRINGS) != 0 |
| 2195 | && be_strict) |
| 2196 | ERROR (gettext ("\ |
| 2197 | section [%2zu] '%s': strings flag set without merge flag\n"), |
| 2198 | cnt, section_name (ebl, cnt)); |
| 2199 | |
| 2200 | if ((shdr->sh_flags & SHF_MERGE) != 0 && shdr->sh_entsize == 0) |
| 2201 | ERROR (gettext ("\ |
| 2202 | section [%2zu] '%s': merge flag set but entry size is zero\n"), |
| 2203 | cnt, section_name (ebl, cnt)); |
| 2204 | |
| 2205 | if (shdr->sh_flags & SHF_GROUP) |
| 2206 | check_scn_group (ebl, cnt); |
| 2207 | |
| 2208 | if (ehdr->e_type != ET_REL && (shdr->sh_flags & SHF_ALLOC) != 0) |
| 2209 | { |
| 2210 | /* Make sure the section is contained in a loaded segment |
| 2211 | and that the initialization part matches NOBITS sections. */ |
| 2212 | int pcnt; |
| 2213 | GElf_Phdr phdr_mem; |
| 2214 | GElf_Phdr *phdr; |
| 2215 | |
| 2216 | for (pcnt = 0; pcnt < ehdr->e_phnum; ++pcnt) |
| 2217 | if ((phdr = gelf_getphdr (ebl->elf, pcnt, &phdr_mem)) != NULL |
| 2218 | && ((phdr->p_type == PT_LOAD |
| 2219 | && (shdr->sh_flags & SHF_TLS) == 0) |
| 2220 | || (phdr->p_type == PT_TLS |
| 2221 | && (shdr->sh_flags & SHF_TLS) != 0)) |
| 2222 | && phdr->p_offset <= shdr->sh_offset |
| 2223 | && phdr->p_offset + phdr->p_memsz > shdr->sh_offset) |
| 2224 | { |
| 2225 | /* Found the segment. */ |
| 2226 | if (phdr->p_offset + phdr->p_memsz |
| 2227 | < shdr->sh_offset + shdr->sh_size) |
| 2228 | ERROR (gettext ("\ |
| 2229 | section [%2zu] '%s' not fully contained in segment of program header entry %d\n"), |
| 2230 | cnt, section_name (ebl, cnt), pcnt); |
| 2231 | |
| 2232 | if (shdr->sh_type == SHT_NOBITS) |
| 2233 | { |
| 2234 | if (shdr->sh_offset < phdr->p_offset + phdr->p_filesz |
| 2235 | && !is_debuginfo) |
| 2236 | ERROR (gettext ("\ |
| 2237 | section [%2zu] '%s' has type NOBITS but is read from the file in segment of program header entry %d\n"), |
| 2238 | cnt, section_name (ebl, cnt), pcnt); |
| 2239 | } |
| 2240 | else |
| 2241 | { |
| 2242 | if (shdr->sh_offset >= phdr->p_offset + phdr->p_filesz) |
| 2243 | ERROR (gettext ("\ |
| 2244 | section [%2zu] '%s' has not type NOBITS but is not read from the file in segment of program header entry %d\n"), |
| 2245 | cnt, section_name (ebl, cnt), pcnt); |
| 2246 | } |
| 2247 | |
| 2248 | break; |
| 2249 | } |
| 2250 | |
| 2251 | if (pcnt == ehdr->e_phnum) |
| 2252 | ERROR (gettext ("\ |
| 2253 | section [%2zu] '%s': alloc flag set but section not in any loaded segment\n"), |
| 2254 | cnt, section_name (ebl, cnt)); |
| 2255 | } |
| 2256 | |
| 2257 | if (cnt == shstrndx && shdr->sh_type != SHT_STRTAB) |
| 2258 | ERROR (gettext ("\ |
| 2259 | section [%2zu] '%s': ELF header says this is the section header string table but type is not SHT_TYPE\n"), |
| 2260 | cnt, section_name (ebl, cnt)); |
| 2261 | |
| 2262 | switch (shdr->sh_type) |
| 2263 | { |
| 2264 | case SHT_SYMTAB: |
| 2265 | case SHT_DYNSYM: |
| 2266 | check_symtab (ebl, ehdr, cnt); |
| 2267 | break; |
| 2268 | |
| 2269 | case SHT_RELA: |
| 2270 | check_rela (ebl, ehdr, cnt); |
| 2271 | break; |
| 2272 | |
| 2273 | case SHT_REL: |
| 2274 | check_rel (ebl, ehdr, cnt); |
| 2275 | break; |
| 2276 | |
| 2277 | case SHT_DYNAMIC: |
| 2278 | check_dynamic (ebl, cnt); |
| 2279 | break; |
| 2280 | |
| 2281 | case SHT_SYMTAB_SHNDX: |
| 2282 | check_symtab_shndx (ebl, cnt); |
| 2283 | break; |
| 2284 | |
| 2285 | case SHT_HASH: |
| 2286 | check_hash (ebl, cnt); |
| 2287 | break; |
| 2288 | |
| 2289 | case SHT_NULL: |
| 2290 | check_null (ebl, shdr, cnt); |
| 2291 | break; |
| 2292 | |
| 2293 | case SHT_GROUP: |
| 2294 | check_group (ebl, ehdr, shdr, cnt); |
| 2295 | break; |
| 2296 | |
| 2297 | case SHT_GNU_versym: |
| 2298 | check_versym (ebl, shdr, cnt); |
| 2299 | break; |
| 2300 | |
| 2301 | default: |
| 2302 | /* Nothing. */ |
| 2303 | break; |
| 2304 | } |
| 2305 | } |
| 2306 | |
| 2307 | if (has_interp_segment && !dot_interp_section) |
| 2308 | ERROR (gettext ("INTERP program header entry but no .interp section\n")); |
| 2309 | |
| 2310 | free (scnref); |
| 2311 | } |
| 2312 | |
| 2313 | |
| 2314 | static void |
| 2315 | check_note (Ebl *ebl, GElf_Ehdr *ehdr, GElf_Phdr *phdr, int cnt) |
| 2316 | { |
| 2317 | if (ehdr->e_type != ET_CORE && ehdr->e_type != ET_REL |
| 2318 | && ehdr->e_type != ET_EXEC && ehdr->e_type != ET_DYN) |
| 2319 | ERROR (gettext ("\ |
| 2320 | phdr[%d]: no note entries defined for the type of file\n"), |
| 2321 | cnt); |
| 2322 | |
| 2323 | if (is_debuginfo) |
| 2324 | /* The p_offset values in a separate debug file are bogus. */ |
| 2325 | return; |
| 2326 | |
| 2327 | char *notemem = gelf_rawchunk (ebl->elf, phdr->p_offset, phdr->p_filesz); |
| 2328 | |
| 2329 | /* ELF64 files often use note section entries in the 32-bit format. |
| 2330 | The p_align field is set to 8 in case the 64-bit format is used. |
| 2331 | In case the p_align value is 0 or 4 the 32-bit format is |
| 2332 | used. */ |
| 2333 | GElf_Xword align = phdr->p_align == 0 || phdr->p_align == 4 ? 4 : 8; |
| 2334 | #define ALIGNED_LEN(len) (((len) + align - 1) & ~(align - 1)) |
| 2335 | |
| 2336 | GElf_Xword idx = 0; |
| 2337 | while (idx < phdr->p_filesz) |
| 2338 | { |
| 2339 | uint64_t namesz; |
| 2340 | uint64_t descsz; |
| 2341 | uint64_t type; |
| 2342 | uint32_t namesz32; |
| 2343 | uint32_t descsz32; |
| 2344 | |
| 2345 | if (align == 4) |
| 2346 | { |
| 2347 | uint32_t *ptr = (uint32_t *) (notemem + idx); |
| 2348 | |
| 2349 | if ((__BYTE_ORDER == __LITTLE_ENDIAN |
| 2350 | && ehdr->e_ident[EI_DATA] == ELFDATA2MSB) |
| 2351 | || (__BYTE_ORDER == __BIG_ENDIAN |
| 2352 | && ehdr->e_ident[EI_DATA] == ELFDATA2LSB)) |
| 2353 | { |
| 2354 | namesz32 = namesz = bswap_32 (*ptr); |
| 2355 | ++ptr; |
| 2356 | descsz32 = descsz = bswap_32 (*ptr); |
| 2357 | ++ptr; |
| 2358 | type = bswap_32 (*ptr); |
| 2359 | } |
| 2360 | else |
| 2361 | { |
| 2362 | namesz32 = namesz = *ptr++; |
| 2363 | descsz32 = descsz = *ptr++; |
| 2364 | type = *ptr; |
| 2365 | } |
| 2366 | } |
| 2367 | else |
| 2368 | { |
| 2369 | uint64_t *ptr = (uint64_t *) (notemem + idx); |
| 2370 | uint32_t *ptr32 = (uint32_t *) (notemem + idx); |
| 2371 | |
| 2372 | if ((__BYTE_ORDER == __LITTLE_ENDIAN |
| 2373 | && ehdr->e_ident[EI_DATA] == ELFDATA2MSB) |
| 2374 | || (__BYTE_ORDER == __BIG_ENDIAN |
| 2375 | && ehdr->e_ident[EI_DATA] == ELFDATA2LSB)) |
| 2376 | { |
| 2377 | namesz = bswap_64 (*ptr); |
| 2378 | ++ptr; |
| 2379 | descsz = bswap_64 (*ptr); |
| 2380 | ++ptr; |
| 2381 | type = bswap_64 (*ptr); |
| 2382 | |
| 2383 | namesz32 = bswap_32 (*ptr32); |
| 2384 | ++ptr32; |
| 2385 | descsz32 = bswap_32 (*ptr32); |
| 2386 | } |
| 2387 | else |
| 2388 | { |
| 2389 | namesz = *ptr++; |
| 2390 | descsz = *ptr++; |
| 2391 | type = *ptr; |
| 2392 | |
| 2393 | namesz32 = *ptr32++; |
| 2394 | descsz32 = *ptr32; |
| 2395 | } |
| 2396 | } |
| 2397 | |
| 2398 | if (idx + 3 * align > phdr->p_filesz |
| 2399 | || (idx + 3 * align + ALIGNED_LEN (namesz) + ALIGNED_LEN (descsz) |
| 2400 | > phdr->p_filesz)) |
| 2401 | { |
| 2402 | if (ehdr->e_ident[EI_CLASS] == ELFCLASS64 |
| 2403 | && idx + 3 * 4 <= phdr->p_filesz |
| 2404 | && (idx + 3 * 4 + ALIGNED_LEN (namesz32) + ALIGNED_LEN (descsz32) |
| 2405 | <= phdr->p_filesz)) |
| 2406 | ERROR (gettext ("\ |
| 2407 | phdr[%d]: note entries probably in form of a 32-bit ELF file\n"), cnt); |
| 2408 | else |
| 2409 | ERROR (gettext ("phdr[%d]: extra %zu bytes after last note\n"), |
| 2410 | cnt, (size_t) (phdr->p_filesz - idx)); |
| 2411 | break; |
| 2412 | } |
| 2413 | |
| 2414 | /* Make sure it is one of the note types we know about. */ |
| 2415 | if (ehdr->e_type == ET_CORE) |
| 2416 | { |
| 2417 | switch (type) |
| 2418 | { |
| 2419 | case NT_PRSTATUS: |
| 2420 | case NT_FPREGSET: |
| 2421 | case NT_PRPSINFO: |
| 2422 | case NT_TASKSTRUCT: /* NT_PRXREG on Solaris. */ |
| 2423 | case NT_PLATFORM: |
| 2424 | case NT_AUXV: |
| 2425 | case NT_GWINDOWS: |
| 2426 | case NT_ASRS: |
| 2427 | case NT_PSTATUS: |
| 2428 | case NT_PSINFO: |
| 2429 | case NT_PRCRED: |
| 2430 | case NT_UTSNAME: |
| 2431 | case NT_LWPSTATUS: |
| 2432 | case NT_LWPSINFO: |
| 2433 | case NT_PRFPXREG: |
| 2434 | /* Known type. */ |
| 2435 | break; |
| 2436 | |
| 2437 | default: |
| 2438 | ERROR (gettext ("\ |
| 2439 | phdr[%d]: unknown core file note type %" PRIu64 " at offset %" PRIu64 "\n"), |
| 2440 | cnt, type, idx); |
| 2441 | } |
| 2442 | } |
| 2443 | else |
| 2444 | { |
| 2445 | if (type != NT_VERSION) |
| 2446 | ERROR (gettext ("\ |
| 2447 | phdr[%d]: unknown object file note type %" PRIu64 " at offset %" PRIu64 "\n"), |
| 2448 | cnt, type, idx); |
| 2449 | } |
| 2450 | |
| 2451 | /* Move to the next entry. */ |
| 2452 | idx += 3 * align + ALIGNED_LEN (namesz) + ALIGNED_LEN (descsz); |
| 2453 | |
| 2454 | } |
| 2455 | |
| 2456 | gelf_freechunk (ebl->elf, notemem); |
| 2457 | } |
| 2458 | |
| 2459 | |
| 2460 | static void |
| 2461 | check_program_header (Ebl *ebl, GElf_Ehdr *ehdr) |
| 2462 | { |
| 2463 | if (ehdr->e_phoff == 0) |
| 2464 | return; |
| 2465 | |
| 2466 | if (ehdr->e_type != ET_EXEC && ehdr->e_type != ET_DYN |
| 2467 | && ehdr->e_type != ET_CORE) |
| 2468 | ERROR (gettext ("\ |
| 2469 | only executables, shared objects, and core files can have program headers\n")); |
| 2470 | |
| 2471 | int num_pt_interp = 0; |
| 2472 | int num_pt_tls = 0; |
| 2473 | int num_pt_relro = 0; |
| 2474 | |
| 2475 | for (int cnt = 0; cnt < ehdr->e_phnum; ++cnt) |
| 2476 | { |
| 2477 | GElf_Phdr phdr_mem; |
| 2478 | GElf_Phdr *phdr; |
| 2479 | |
| 2480 | phdr = gelf_getphdr (ebl->elf, cnt, &phdr_mem); |
| 2481 | if (phdr == NULL) |
| 2482 | { |
| 2483 | ERROR (gettext ("cannot get program header entry %d: %s\n"), |
| 2484 | cnt, elf_errmsg (-1)); |
| 2485 | continue; |
| 2486 | } |
| 2487 | |
| 2488 | if (phdr->p_type >= PT_NUM && phdr->p_type != PT_GNU_EH_FRAME |
| 2489 | && phdr->p_type != PT_GNU_STACK && phdr->p_type != PT_GNU_RELRO) |
| 2490 | ERROR (gettext ("\ |
| 2491 | program header entry %d: unknown program header entry type\n"), |
| 2492 | cnt); |
| 2493 | |
| 2494 | if (phdr->p_type == PT_LOAD) |
| 2495 | has_loadable_segment = true; |
| 2496 | else if (phdr->p_type == PT_INTERP) |
| 2497 | { |
| 2498 | if (++num_pt_interp != 1) |
| 2499 | { |
| 2500 | if (num_pt_interp == 2) |
| 2501 | ERROR (gettext ("\ |
| 2502 | more than one INTERP entry in program header\n")); |
| 2503 | } |
| 2504 | has_interp_segment = true; |
| 2505 | } |
| 2506 | else if (phdr->p_type == PT_TLS) |
| 2507 | { |
| 2508 | if (++num_pt_tls == 2) |
| 2509 | ERROR (gettext ("more than one TLS entry in program header\n")); |
| 2510 | } |
| 2511 | else if (phdr->p_type == PT_NOTE) |
| 2512 | check_note (ebl, ehdr, phdr, cnt); |
| 2513 | else if (phdr->p_type == PT_DYNAMIC |
| 2514 | && ehdr->e_type == ET_EXEC && ! has_interp_segment) |
| 2515 | ERROR (gettext ("static executable cannot have dynamic sections\n")); |
| 2516 | else if (phdr->p_type == PT_GNU_RELRO) |
| 2517 | { |
| 2518 | if (++num_pt_relro == 2) |
| 2519 | ERROR (gettext ("\ |
| 2520 | more than one GNU_RELRO entry in program header\n")); |
| 2521 | else |
| 2522 | { |
| 2523 | /* Check that the region is in a writable segment. */ |
| 2524 | int inner; |
| 2525 | for (inner = 0; inner < ehdr->e_phnum; ++inner) |
| 2526 | { |
| 2527 | GElf_Phdr phdr2_mem; |
| 2528 | GElf_Phdr *phdr2; |
| 2529 | |
| 2530 | phdr2 = gelf_getphdr (ebl->elf, inner, &phdr2_mem); |
| 2531 | if (phdr2 == NULL) |
| 2532 | continue; |
| 2533 | |
| 2534 | if (phdr2->p_type == PT_LOAD |
| 2535 | && phdr->p_vaddr >= phdr2->p_vaddr |
| 2536 | && (phdr->p_vaddr + phdr->p_memsz |
| 2537 | <= phdr2->p_vaddr + phdr2->p_memsz)) |
| 2538 | { |
| 2539 | if ((phdr2->p_flags & PF_W) == 0) |
| 2540 | ERROR (gettext ("\ |
| 2541 | loadable segment GNU_RELRO applies to is not writable\n")); |
| 2542 | if ((phdr2->p_flags & PF_X) != 0) |
| 2543 | ERROR (gettext ("\ |
| 2544 | loadable segment GNU_RELRO applies to is executable\n")); |
| 2545 | break; |
| 2546 | } |
| 2547 | } |
| 2548 | |
| 2549 | if (inner >= ehdr->e_phnum) |
| 2550 | ERROR (gettext ("\ |
| 2551 | GNU_RELRO segment not contained in a loaded segment\n")); |
| 2552 | } |
| 2553 | } |
| 2554 | |
| 2555 | if (phdr->p_filesz > phdr->p_memsz) |
| 2556 | ERROR (gettext ("\ |
| 2557 | program header entry %d: file size greater than memory size\n"), |
| 2558 | cnt); |
| 2559 | |
| 2560 | if (phdr->p_align > 1) |
| 2561 | { |
| 2562 | if (!powerof2 (phdr->p_align)) |
| 2563 | ERROR (gettext ("\ |
| 2564 | program header entry %d: alignment not a power of 2\n"), cnt); |
| 2565 | else if ((phdr->p_vaddr - phdr->p_offset) % phdr->p_align != 0) |
| 2566 | ERROR (gettext ("\ |
| 2567 | program header entry %d: file offset and virtual address not module of alignment\n"), cnt); |
| 2568 | } |
| 2569 | } |
| 2570 | } |
| 2571 | |
| 2572 | |
| 2573 | /* Process one file. */ |
| 2574 | static void |
| 2575 | process_elf_file (Elf *elf, const char *prefix, const char *suffix, |
| 2576 | const char *fname, size_t size, bool only_one) |
| 2577 | { |
| 2578 | /* Reset variables. */ |
| 2579 | ndynamic = 0; |
| 2580 | |
| 2581 | GElf_Ehdr ehdr_mem; |
| 2582 | GElf_Ehdr *ehdr = gelf_getehdr (elf, &ehdr_mem); |
| 2583 | Ebl *ebl; |
| 2584 | |
| 2585 | /* Print the file name. */ |
| 2586 | if (!only_one) |
| 2587 | { |
| 2588 | if (prefix != NULL) |
| 2589 | printf ("\n%s(%s)%s:\n", prefix, fname, suffix); |
| 2590 | else |
| 2591 | printf ("\n%s:\n", fname); |
| 2592 | } |
| 2593 | |
| 2594 | if (ehdr == NULL) |
| 2595 | { |
| 2596 | ERROR (gettext ("cannot read ELF header: %s\n"), elf_errmsg (-1)); |
| 2597 | return; |
| 2598 | } |
| 2599 | |
| 2600 | ebl = ebl_openbackend (elf); |
| 2601 | /* If there is no appropriate backend library we cannot test |
| 2602 | architecture and OS specific features. Any encountered extension |
| 2603 | is an error. */ |
| 2604 | |
| 2605 | /* Go straight by the gABI, check all the parts in turn. */ |
| 2606 | check_elf_header (ebl, ehdr, size); |
| 2607 | |
| 2608 | /* Check the program header. */ |
| 2609 | check_program_header (ebl, ehdr); |
| 2610 | |
| 2611 | /* Next the section headers. It is OK if there are no section |
| 2612 | headers at all. */ |
| 2613 | check_sections (ebl, ehdr); |
| 2614 | |
| 2615 | /* Free the resources. */ |
| 2616 | ebl_closebackend (ebl); |
| 2617 | } |