在解析PE中,使用二级指针了,,在将PE加在到内存拉伸,拷贝section使用出现了问题,导致PE加载到内存,保存为PE文件的时候,无法运行.
PE加载到还原为文件PE加载到内存到还原为文件的过程
下面的一段代码,是有问题的.我们先看看代码
PIMAGE_SECTION_HEADER temp_section_header = section_header;for (int i = 0; i < file_header->NumberOfSections; i++){ //每次都是获取第一个节的内存地址void* des = (void*)((unsigned long)temp_buffer + temp_section_header->VirtualAddress); 电脑 void* src = (void*)((unsigned long)ptemp +(temp_section_header + i)->PointerToRawData); // //每次都是一个节的大小memcpy(des, src, temp_section_header->SizeOfRawData); }
在循环内的3行代码,有两个代码是问题的(第一行和第三行).
正确的代码PIMAGE_SECTION_HEADER temp_section_header = section_header;for (int i = 0; i < file_header->NumberOfSections; i++){PIMAGE_SECTION_HEADER psection = temp_section_header + i; //这里void* des = (void*)((unsigned long)temp_buffer + psection->VirtualAddress); //temp_section_header + 1,移动多少呢?void* src = (void*)((unsigned long)ptemp + psection->PointerToRawData); memcpy(des, src, psection->SizeOfRawData);}拉伸
拉伸:读取section(节)在文件中的PointerToRawData(在文件中的偏移量),大小为SizeOfRawData(文件中对齐的长度),转为在内存上布局.
//将pe文件(在内存中电脑,还是文件布局)转换为pe在内存布局unsigned long buffer_to_image(char** file_buffer, char** image_buffer){PIMAGE_DOS_HEADER dos_header = NULL;PIMAGE_NT_HEADERS nt_header = NULL;PIMAGE_FILE_HEADER file_header = NULL;PIMAGE_OPTIONAL_HEADER optional_header = NULL;PIMAGE_SECTION_HEADER section_header = NULL;char* ptemp = *file_buffer;void* temp_buffer = NULL;if (file_buffer == NULL){printf("file_buff is null\n");return 0;}if (*(short*)ptemp != IMAGE_DOS_SIGNATURE){printf("%08x\n", *(short*)ptemp);//校验是否为dos头 pe开头为mzreturn 0;}dos_header = (PIMAGE_DOS_HEADER)ptemp;if (*(short*)((unsigned long)ptemp + dos_header->e_lfanew) != IMAGE_NT_SIGNATURE){//校验nt头是否有pe标志 PEreturn 0;}nt_header = (PIMAGE_NT_HEADERS)((unsigned long)ptemp + dos_header->e_lfanew);file_header = (PIMAGE_FILE_HEADER)((unsigned long)nt_header + 4);optional_header = (PIMAGE_OPTIONAL_HEADER)((unsigned long)file_header + IMAGE_SIZEOF_FILE_HEADER);section_header = (PIMAGE_SECTION_HEADER)((unsigned long)optional_header + file_header->SizeOfOptionalHeader);//分配空间temp_buffer = calloc(1, optional_header->SizeOfImage);if (!temp_buffer){temp_buffer = NULL;return 0;}//从dos头开始拷贝,拷贝首部+块表的大小,到内存中memcpy(temp_buffer, dos_header, optional_header->SizeOfHeaders); //SizeOfHeaders为首部及块表(首部+块表)的大小PIMAGE_SECTION_HEADER temp_section_header = section_header;for (int i = 0; i < file_header->NumberOfSections; i++){PIMAGE_SECTION_HEADER psection = temp_section_header + i;void* des = (void*)((unsigned long)temp_buffer + psection->VirtualAddress);void* src = (void*)((unsigned long)ptemp + psection->PointerToRawData); memcpy(des, src, psection->SizeOfRawData);}*image_buffer = temp_buffer;return optional_header->SizeOfImage; //SizeOfImage在内存中整个PE映像的大小}还原
//从内存还原为文件int recovery_file(void** image_buffer, char* file, int size){PIMAGE_DOS_HEADER dos_header = NULL;PIMAGE_NT_HEADERS nt_header = NULL;PIMAGE_FILE_HEADER file_header = NULL;PIMAGE_OPTIONAL_HEADER optional_header = NULL;PIMAGE_SECTION_HEADER section_header = NULL;char* ptemp = *image_buffer;dos_header = (PIMAGE_DOS_HEADER)ptemp;if (*(short*)((unsigned long)ptemp + dos_header->e_lfanew) != IMAGE_NT_SIGNATURE){//校验nt头是否有pe标志 PEreturn 0;}nt_header = (PIMAGE_NT_HEADERS)((unsigned long)ptemp + dos_header->e_lfanew);file_header = (PIMAGE_FILE_HEADER)((unsigned long)nt_header + 4);optional_header = (PIMAGE_OPTIONAL_HEADER)((unsigned long)file_header + IMAGE_SIZEOF_FILE_HEADER);section_header = (PIMAGE_SECTION_HEADER)((unsigned long)optional_header + file_header->SizeOfOptionalHeader);char* file_buffer = calloc(1, size);memcpy(file_buffer, dos_header, optional_header->SizeOfHeaders);PIMAGE_SECTION_HEADER temp_section_header = section_header;for (int i = 0; i < file_header->NumberOfSections; i++){PIMAGE_SECTION_HEADER psection = temp_section_header + i;void* des = (void*)((unsigned long)file_buffer + psection->PointerToRawData);void* src = (void*)((unsigned long)ptemp + psection->VirtualAddress); memcpy(des, src, psection->SizeOfRawData);}FILE* fp = fopen(file, "wb+");if (fp != NULL){fwrite((void*)file_buffer, size, 1, fp);}fclose(fp);}
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