| Dl_info checkDlinfo;
if(!dladdr((const void *)checkAddress, &checkDlinfo)){
return false;
}
const char * checkfname = checkDlinfo.dli_fname;
struct mach_header_64 * checkMachHeader = (struct mach_header_64 *) checkDlinfo.dli_fbase;
if (checkMachHeader->magic != MH_MAGIC_64)
return false;
if(checkMachHeader->ncmds == 0)
return false;
struct segment_command_64 * checkCommand = (struct segment_command_64 *) ((char *)checkMachHeader + sizeof(struct mach_header_64));
struct segment_command_64 * checkTextCommand = NULL;
for (int i =0; i< checkMachHeader->ncmds; i++) {
if ((checkCommand->cmd == LC_SEGMENT_64) && (strcmp(checkCommand->segname, "__TEXT") == 0))
{
checkTextCommand = checkCommand;
break;
}
checkCommand =(struct segment_command_64 *) ((uint64_t)checkCommand + checkCommand->cmdsize);
}
if (!checkTextCommand)
return false;
uint64_t checkTextVmSize = checkTextCommand->vmsize;
kern_return_t kernReturn = KERN_SUCCESS;
const char *sharedCachePaths[] = {
"/System/Library/Caches/com.apple.dyld/dyld_shared_cache_arm64",
"/System/Library/Caches/com.apple.dyld/dyld_shared_cache_arm64e",
"/System/Library/dyld/dyld_shared_cache_arm64e",
};
int fd = -1;
for (int i = 0;i < sizeof(sharedCachePaths) / sizeof(char *);i++) {
fd = open(sharedCachePaths[i], O_RDONLY);
if (fd != -1) {
break;
}
}
if (fd == -1)
return false;
vm_size_t vmPageSize = vm_page_size;
unsigned char* p_map =( unsigned char*) mmap(0, vmPageSize, PROT_READ,MAP_NOCACHE|MAP_PRIVATE, fd, 0);
if (p_map == MAP_FAILED) {
//映射失败
close(fd);
return false;
}
struct dyld_cache_header * cacheHeader = ( struct dyld_cache_header *)p_map;
if(strcmp(cacheHeader->magic, "dyld_v1 arm64") != 0){
munmap(p_map, vmPageSize);
close(fd);
return false;
}
struct dyld_cache_mapping_info* mappings = (struct dyld_cache_mapping_info*)(cacheHeader->mappingOffset + (uintptr_t)cacheHeader);
uintptr_t length = mappings[0].size;
munmap(p_map, vmPageSize);
vmPageSize = length;
p_map =( unsigned char *) mmap(0, vmPageSize, PROT_READ, MAP_NOCACHE|MAP_PRIVATE|MAP_NORESERVE, fd, 0);
if (p_map == MAP_FAILED) {
//映射失败
printf("error:%s\n", strerror(errno));
close(fd);
return false;
}
cacheHeader = ( struct dyld_cache_header *)p_map;
mappings = (struct dyld_cache_mapping_info*)(cacheHeader->mappingOffset + (uintptr_t)cacheHeader);
//非越狱系统 imagesCount = 0 越狱系统 imagesCount > 0
uint32_t imagesCount = cacheHeader->imagesCount;
if (imagesCount == 0) {
munmap(p_map, vmPageSize);
close(fd);
return false;
}
struct dyld_cache_image_info* dylibs = (struct dyld_cache_image_info*)((uintptr_t)cacheHeader + cacheHeader->imagesOffset);
struct dyld_cache_image_info * matchDylib = NULL;
for (uint32_t i=0; i < imagesCount; i++) {
const char* dylibPath = (char*)cacheHeader + dylibs[i].pathFileOffset;
if (strcmp(checkfname, dylibPath) == 0) {
matchDylib = (struct dyld_cache_image_info*)&dylibs[i];
//NSLog(@"IsRiskModule 函数,匹配到 filename =%s",dylibPath);
break;
}
}
if (!matchDylib) {
NSLog(@"IsRiskModule 函数,找不到 filename =%s",checkfname);
munmap(p_map, vmPageSize);
close(fd);
return false;
}
uint64_t offset = 0;
bool bMatch = false;
for (int i = 0 ; i< cacheHeader->mappingCount; i++) {
uint64_t StartAddress =mappings[i].address;
if (matchDylib->address >= StartAddress){
uint64_t EndAddress = mappings[i].address +mappings[i].size;
if (matchDylib->address <= EndAddress) {
offset = matchDylib->address - mappings[i].address + mappings[i].fileOffset ;
bMatch = true;
break;;
}
}
}
if (!bMatch) {
munmap(p_map, vmPageSize);
close(fd);
return false;
}
struct mach_header_64* matchHeader = (struct mach_header_64*)((uintptr_t)cacheHeader + offset);
if(matchHeader->ncmds == 0)
return false;
struct segment_command_64 * matchCommand = (struct segment_command_64 *) ((char *)matchHeader + sizeof(struct mach_header_64));
struct segment_command_64 * matchTextCommand = NULL;
for (int i =0; i< matchHeader->ncmds; i++) {
if ((matchCommand->cmd == LC_SEGMENT_64) && (strcmp(matchCommand->segname, "__TEXT") == 0))
{
matchTextCommand = matchCommand;
break;
}
matchCommand =(struct segment_command_64 *) ((uint64_t)matchCommand + matchCommand->cmdsize);
}
if (!matchTextCommand) {
munmap(p_map, vmPageSize);
close(fd);
return false;
}
if (matchTextCommand->vmsize != checkTextVmSize ) {
munmap(p_map, vmPageSize);
close(fd);
return true;
}
bool bIsRisk = false;
for (int i = 0; i< checkTextVmSize ; i++) {
unsigned char Byte1 = *(unsigned char*) ((uint64_t)matchHeader+i);
unsigned char Byte2 = *(unsigned char*) ((uint64_t)checkMachHeader+i);
if (Byte1 != Byte2)
{
bIsRisk = true;
NSLog(@"IsRiskModule 被污染的库,filename =%s,基地址 = 0x%llX,函数地址=0x%llX",checkfname,((uint64_t)checkMachHeader),(uint64_t)i);
break;
}
}
munmap(p_map, vmPageSize);
close(fd);
return bIsRisk;
| 
