elfclass.h 3.1 KB

12345678910111213141516171819202122232425262728293031323334353637383940414243444546474849505152535455565758596061626364656667686970717273747576777879808182
  1. /*
  2. * Copyright (c) Christos Zoulas 2008.
  3. * All Rights Reserved.
  4. *
  5. * Redistribution and use in source and binary forms, with or without
  6. * modification, are permitted provided that the following conditions
  7. * are met:
  8. * 1. Redistributions of source code must retain the above copyright
  9. * notice immediately at the beginning of the file, without modification,
  10. * this list of conditions, and the following disclaimer.
  11. * 2. Redistributions in binary form must reproduce the above copyright
  12. * notice, this list of conditions and the following disclaimer in the
  13. * documentation and/or other materials provided with the distribution.
  14. *
  15. * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  16. * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  17. * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  18. * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
  19. * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  20. * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  21. * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  22. * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  23. * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  24. * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  25. * SUCH DAMAGE.
  26. */
  27. if (nbytes <= sizeof(elfhdr))
  28. return 0;
  29. u.l = 1;
  30. (void)memcpy(&elfhdr, buf, sizeof elfhdr);
  31. swap = (u.c[sizeof(int32_t) - 1] + 1) != elfhdr.e_ident[EI_DATA];
  32. type = elf_getu16(swap, elfhdr.e_type);
  33. notecount = ms->elf_notes_max;
  34. switch (type) {
  35. #ifdef ELFCORE
  36. case ET_CORE:
  37. phnum = elf_getu16(swap, elfhdr.e_phnum);
  38. if (phnum > ms->elf_phnum_max)
  39. return toomany(ms, "program headers", phnum);
  40. flags |= FLAGS_IS_CORE;
  41. if (dophn_core(ms, clazz, swap, fd,
  42. CAST(off_t, elf_getu(swap, elfhdr.e_phoff)), phnum,
  43. CAST(size_t, elf_getu16(swap, elfhdr.e_phentsize)),
  44. fsize, &flags, &notecount) == -1)
  45. return -1;
  46. break;
  47. #endif
  48. case ET_EXEC:
  49. case ET_DYN:
  50. phnum = elf_getu16(swap, elfhdr.e_phnum);
  51. if (phnum > ms->elf_phnum_max)
  52. return toomany(ms, "program", phnum);
  53. shnum = elf_getu16(swap, elfhdr.e_shnum);
  54. if (shnum > ms->elf_shnum_max)
  55. return toomany(ms, "section", shnum);
  56. if (dophn_exec(ms, clazz, swap, fd,
  57. CAST(off_t, elf_getu(swap, elfhdr.e_phoff)), phnum,
  58. CAST(size_t, elf_getu16(swap, elfhdr.e_phentsize)),
  59. fsize, shnum, &flags, &notecount) == -1)
  60. return -1;
  61. /*FALLTHROUGH*/
  62. case ET_REL:
  63. shnum = elf_getu16(swap, elfhdr.e_shnum);
  64. if (shnum > ms->elf_shnum_max)
  65. return toomany(ms, "section headers", shnum);
  66. if (doshn(ms, clazz, swap, fd,
  67. CAST(off_t, elf_getu(swap, elfhdr.e_shoff)), shnum,
  68. CAST(size_t, elf_getu16(swap, elfhdr.e_shentsize)),
  69. fsize, elf_getu16(swap, elfhdr.e_machine),
  70. CAST(int, elf_getu16(swap, elfhdr.e_shstrndx)),
  71. &flags, &notecount) == -1)
  72. return -1;
  73. break;
  74. default:
  75. break;
  76. }
  77. if (notecount == 0)
  78. return toomany(ms, "notes", ms->elf_notes_max);
  79. return 1;