elf_core.c

   1 void *PERBIT(get_section)(void *file,
   2                           unsigned long fsize,
   3                           const char *secname,
   4                           unsigned long *secsize,
   5                           int conv)
   6 {
   7         ElfPERBIT(Ehdr) *hdr;
   8         ElfPERBIT(Shdr) *sechdrs;
   9         ElfPERBIT(Off) e_shoff;
  10         ElfPERBIT(Half) e_shnum, e_shstrndx;
  11
  12         const char *secnames;
  13         unsigned int i;
  14
  15         if (fsize > 0 && fsize < sizeof(*hdr))
  16                 return NULL;
  17
  18         hdr = file;
  19         e_shoff = END(hdr->e_shoff, conv);
  20         e_shnum = END(hdr->e_shnum, conv);
  21         e_shstrndx = END(hdr->e_shstrndx, conv);
  22
  23         if (fsize > 0 && fsize < e_shoff + e_shnum * sizeof(sechdrs[0]))
  24                 return NULL;
  25
  26         sechdrs = file + e_shoff;
  27
  28         if (fsize > 0 && fsize < END(sechdrs[e_shstrndx].sh_offset, conv))
  29                 return NULL;
  30
  31         /* Find section by name, return pointer and size. */
  32
  33         secnames = file + END(sechdrs[e_shstrndx].sh_offset, conv);
  34         for (i = 1; i < e_shnum; i++) {
  35                 if (streq(secnames + END(sechdrs[i].sh_name, conv), secname)) {
  36                         *secsize = END(sechdrs[i].sh_size, conv);
  37                         return file + END(sechdrs[i].sh_offset, conv);
  38                 }
  39         }
  40         *secsize = 0;
  41         return NULL;
  42 }
  43