static int _decode64_symtab(AsmFormatPlugin * format, Elf64_Ehdr * ehdr, Elf64_Shdr * shdr, size_t shdr_cnt, uint16_t ndx) { AsmFormatPluginHelper * helper = format->helper; char * strtab = NULL; size_t strtab_cnt = 0; Elf64_Sym sym; size_t i; off_t offset; #ifdef DEBUG fprintf(stderr, "DEBUG: %s()\n", __func__); #endif if(ndx >= shdr_cnt || shdr[ndx].sh_entsize != sizeof(sym)) return -1; if(_decode64_strtab(format, shdr, shdr_cnt, shdr[ndx].sh_link, &strtab, &strtab_cnt) != 0) return -1; /* read and process symbols */ if((offset = helper->seek(helper->format, shdr[ndx].sh_offset, SEEK_SET)) < 0 || (unsigned long)offset != shdr[ndx].sh_offset) { free(strtab); return -1; } for(i = 0; i * sizeof(sym) < shdr[ndx].sh_size; i++) if(helper->read(helper->format, &sym, sizeof(sym)) != sizeof(sym)) break; else if(sym.st_name >= strtab_cnt) break; else if(ELF64_ST_TYPE(sym.st_info) == STT_FUNC) { offset = -1; if(ehdr->e_type == ET_REL || ehdr->e_type == ET_EXEC || ehdr->e_type == ET_DYN) offset = sym.st_value; /* record the function */ helper->set_function(helper->format, i, &strtab[sym.st_name], offset, sym.st_size); } if(i * sizeof(sym) != shdr[ndx].sh_size) { free(strtab); return -1; } return 0; }
static int _decode_map_method_id(AsmFormatPlugin * format, off_t offset, size_t size) { AsmFormatPluginHelper * helper = format->helper; Dex * dex = format; ssize_t s; size_t i; AsmString * string; char const * name; #ifdef DEBUG fprintf(stderr, "DEBUG: %s(%ld, %lu)\n", __func__, offset, size); #endif if(dex->dmii != NULL) return 0; /* already parsed */ if(helper->seek(helper->format, offset, SEEK_SET) != offset) return -1; s = sizeof(*dex->dmii) * size; if((dex->dmii = malloc(s)) == NULL) return -error_set_code(1, "%s", strerror(errno)); if(helper->read(helper->format, dex->dmii, s) != s) return -1; for(i = 0; i < size; i++) { dex->dmii[i].class_idx = _htol16(dex->dmii[i].class_idx); dex->dmii[i].proto_idx = _htol16(dex->dmii[i].proto_idx); dex->dmii[i].name_idx = _htol32(dex->dmii[i].name_idx); if((string = helper->get_string_by_id(helper->format, dex->dmii[i].name_idx)) != NULL) name = string->name; else /* XXX report error? */ name = NULL; helper->set_function(helper->format, i, name, -1, -1); } dex->dmii_cnt = size; return 0; }
/* dex_decode_section */ static int _dex_decode_section(AsmFormatPlugin * format, AsmSection * section, AsmArchInstructionCall ** calls, size_t * calls_cnt) { AsmFormatPluginHelper * helper = format->helper; DexMapCodeItem dmci; size_t i; off_t seek; AsmFunction * f; size_t j; DexMapTryItem dmti; ssize_t s; uint32_t u32; int32_t s32; uint32_t v32; #ifdef DEBUG fprintf(stderr, "DEBUG: %s()\n", __func__); #endif if(helper->seek(helper->format, section->offset, SEEK_SET) != section->offset) return -1; for(i = 0; i < section->size; i++) { s = sizeof(dmci); if(helper->read(helper->format, &dmci, s) != s) return -1; dmci.registers_size = _htol16(dmci.registers_size); dmci.ins_size = _htol16(dmci.ins_size); dmci.outs_size = _htol16(dmci.outs_size); dmci.tries_size = _htol16(dmci.tries_size); dmci.debug_info_off = _htol32(dmci.debug_info_off); dmci.insns_size = _htol32(dmci.insns_size); seek = helper->seek(helper->format, 0, SEEK_CUR); if(helper->decode(helper->format, seek, dmci.insns_size * 2, seek, calls, calls_cnt) != 0) return -1; /* update the corresponding function offset */ if((f = helper->get_function_by_id(helper->format, i)) != NULL) /* XXX not very optimal */ helper->set_function(helper->format, i, f->name, seek, dmci.insns_size * 2); /* skip padding and try_items */ seek = (dmci.insns_size & 0x1) == 0x1 ? 2 : 0; #ifdef DEBUG fprintf(stderr, "DEBUG: code item %lu/%lu, offset 0x%lx" ", registers 0x%x, size 0x%x, debug @0x%x" ", tries 0x%x, seek 0x%lx\n", i, section->size, helper->seek(helper->format, 0, SEEK_CUR), dmci.registers_size, dmci.insns_size, dmci.debug_info_off, dmci.tries_size, seek); #endif if(seek != 0 && helper->seek(helper->format, seek, SEEK_CUR) < 0) return -1; if(dmci.tries_size > 0) { for(j = 0; j < dmci.tries_size; j++) { s = sizeof(dmti); if(helper->read(helper->format, &dmti, s) != s) return -1; dmti.start_addr = _htol32(dmti.start_addr); dmti.insn_count = _htol16(dmti.insn_count); dmti.handler_off = _htol16(dmti.handler_off); #ifdef DEBUG fprintf(stderr, "DEBUG: start 0x%x," " insn_count 0x%x," " handler_off 0x%x\n", dmti.start_addr, dmti.insn_count, dmti.handler_off); #endif } /* encoded catch handler */ /* list size */ if(_dex_decode_uleb128(format, &u32) != 0) return -1; for(; u32 > 0; u32--) { /* handler size */ if(_dex_decode_sleb128(format, &s32) != 0) return -1; /* address pairs */ for(j = abs(s32); j > 0; j--) { if(_dex_decode_uleb128(format, &v32) != 0) return -1; if(_dex_decode_uleb128(format, &v32) != 0) return -1; } /* catch-all address */ if(s32 <= 0 && _dex_decode_uleb128(format, &v32) != 0) return -1; } /* ensure alignment on 4 bytes */ seek = helper->seek(helper->format, 0, SEEK_CUR); if((seek = (4 - (seek & 0x3)) & 0x3) != 0) helper->seek(helper->format, seek, SEEK_CUR); } } return 0; }