edx negotiation

dummy1, int dummy2){_ ASM {Push EBPMoV EBP, ESPMoV eax, 152Lea edX, 8 [EBP]Int 0x2ePop EBPRET 9}} It turns out that the user space also has an ntreadfile (), which is executing the self-trapping command "int 0x2e ". Let's take a look at this Assembly Code. Here, 152 is the call number of the System Call ntreadfile (), so when the CPU falls into the system space, the register eax holds the specific system call number. The register

connect them during compilation?In this case, we can conclude that there is another secret. For more information, see ntreadfile () in msvc6/iface/native/syscall/debug/ZW. C: _ Declspec (naked) _ stdcallNtreadfile (INT dummy0, int dummy1, int dummy2){_ ASM {Push EBPMoV EBP, ESPMoV eax, 152Lea edX, 8 [EBP]Int 0x2ePop EBPRET 9}} It turns out that the user space also has an ntreadfile (), which is executing the self-trapping command "int 0x2e ". Let's t

In many network development scenarios, memory conversion is often encountered in the following scenarios: #define PACKAGE_PARSE_ERROR -1#define PACKAGE_PARSE_OK 0int parse_package( int* a, int* b, int* c, int* d, char* buf, int buf_len ){ if( !buf || buf_len This is a call in the Process of network unpacking, and the packet process is a reverse process. An application like this can be replaced by an integer forced conversion, and the efficiency will be at least doubled. To illustrate t

Reading Tips: 《Delphi Image ProcessingThe series focuses on efficiency. The general code is Pascal, and the core code is BaSm. 《C ++ Image ProcessingThe series focuses on code clarity and readability, and all uses C ++ code. Make sure that the two items are consistent and can be compared with each other. The code in this article must include the imagedata. Pas unit in "Delphi Image Processing-data type and public process. The minimum value processing of an image is centered on the current pixel

implementation principle of the security protocol. The function implementation of TLS/SSL mainly relies on three kinds of basic algorithms: hash function hash, symmetric encryption and asymmetric encryption, which realizes identity authentication and key negotiation using asymmetric encryption, the symmetric encryption algorithm uses negotiated key to encrypt data, and verifies the integrality of information based on hash function. Hash function hash

de facto standard? In other words, thefuck is not very tall. _ (: 3 "outputs) _ list of excellent Python projects (awesome-python) Vinta/awesome-python · GitHub Pycrumbs/pycrumbs. md at master · kirang89/pycrumbs · GitHub Svaksha/pythonidae · GitHub Checkcheckzz/python-github-projects · GitHub Rasbt/python_reference · GitHub Easy-Python And awesome-* Series Bayandin/awesome-awesomeness · GitHub Sqlmap! Goagent! By the way, there are also shadowsocks! Open

Tools:VC 7.0BCB 6.0Compilation options: Maximum Speed Optimization (VC 7.0 turns off the automatic inline function option)Decompilation tool: w32dasm Benchmark Test procedure:Void test (){Int A = 0, B = 1, C = 4;For (INT I = 0; I ++;}} Int main (){_ ASM {MoV edX, EDXNOP};Test ();} Purpose: To test the program's ability to optimize useless functions. Because test does not return any value or modify any external variables,Therefore, for programs, this i

: 77F061F8 _ NtQuerySystemInformation @ 16 In ntdll, the two functions of zw and nt are actually the same subject: . Text: 77F061F8 mov eax, 105 h; NtQuerySystemInformation . Text: 77F061F8; RtlGetNativeSystemInformation . Text: 77F061FD mov edx, 7FFE0300h . Text: 77F06202 call dword ptr [edx] . Text: 77F06204 retn 10 h Then compare the image: Check whether the Mode is usermode or kernelmode. Ntdll. the

Core tips: This experiment demonstrates that when calling a method in a class, all methods imply a self parameter, and this parameter is passed as the first parameter of the object method... First, create an empty form and put a button.The following two methods are declared under implementation: // The external method declares only one parameter. In this case, the standard Object internal event Method tpolicyevent is declared. In this declaration, the sender corresponds to the object pointer

add eax,0x8; Pptr+2 003cc57c; In C language, the operation of pointers is 003cc57c based on pointer type; An int pointer plus 1 means that the address it points to is moved backward in length to a 003cc57c; The distance of the int size, which is 4 bytes. If it's a word type, move backwards by 2 bytes. 003cc57f Push eax003cc580 mov ecx,[local.7]003cc583 add ecx,0x4; Pptr+1 003cc586 push ecx003cc587 mov edx,[local.7]003cc58a push

(MOV) (An immediate number is actually a constant integer.) different operand type combinations supported by the data transfer Directive What is inside the parentheses represents the memory address. (For example,%eax, which represents a memory address.) Simple addressing mode If we have an operand that accesses memory, then how is the memory address calculated or referred to as how it is addressed. (-Indirect addressing Take Movl (%ECX),%eax as an example: The register ECX inside the value a

Traceback (most recent):File "manage.py", line all, in startup = Importlib.import_module (Edx_args.startup)File "/usr/lib/python2.7/importlib/__init__.py", line Notoginseng, in Import_module__IMPORT__ (name)File "/edx/app/edxapp/edx-platform/cms/startup.py", line 7, Settings. Installed_apps # pylint:disable=w0104File "/edx/app/edxapp/venvs/edxapp/local/lib/python

Use the cpuid Assembly command (machine code: 0fh a2h, if your compiler does not support cpuid command, only emit machine code), this command can be recognized by the following CPU: More than 486 of Intel CPUs, CPU above cyrix M1, CPU above amd am486 (1) obtain the cpu oem string to determine the CPU vendor Let eax = 0 first, then call cpuid InEl CPU will return: EBX: 756e6547h 'genu'EdX: 49656e69h 'inei'ECX: 6c65746eh 'ntel'EBX, EDX, and ECX

important parts abve are:1. The code at 77D55E9D. Which copies the address of the bmp file stringInto ecx. 2. The code at 77D55EA8. This checks if the hinst parameter passedLoadImage is NULL. If we jump to the code at address 77D57C6E becuase of thisLine: 77D55EB0 je _ LoadBmp @ 20 + 21 h (77D57C6Eh); If esi was NULL jumpsTo code at 77D57C6E This takes us to this assembly: 77D57C6E mov esi, dword ptr [_ hmodUser (77da01_h)]77D57C74 movzx eax, cx77D57C77 xor ebx, ebx77D57C79 sub eax, 7 FDCh77D57

FC Lea edx,[local.1]00441709 |. 8b83 C8020000 mov eax,dword ptr ds:[ebx+0x2c8]0044170f |. E8 901AFEFF call fireworx.004231a4; ; Calculates the length of the serial 00441714 |. 8b45 FC mov eax,[local.1]00441717 |. Push eax00441718 |. 8d55 F4 Lea edx,[local.3]0044171b |. 8b83 C4020000 mov eax,dword ptr ds:[ebx+0x2c4]00441721 |. E8 7e1afeff call fireworx.004231a4; ; Calculates the length of the name

first set breakpointsThen, two times shift+f9.Then, cancel the breakpoint. Alt+f9 and executes to user codeThen step away, and you'll reach Oep.5.1, after loading the program, you will find the first line has an address0040a86d > B8 74de4500 mov eax,qqspirit.0045de742, at the address of the next breakpoint BP 0045de743. Then shift+f9 run, and cancel breakpoint4, we are in the Retn next line set breakpoints, and then shift+f9 Run, and cancel the breakpoint045de74 B8 F9CB45F0 mov eax,f045cbf90045

. The source program entry is _start. As follows:Cpuid2.s # Cpuid2.s file.section. DataOutput: . Asciz "CPUID is '%s ' \ n". Section. BSS . Lcomm Buffer, 12. Section. Text.globl _start_start: NOP movl $,%eax cpuid movl $buffer,%edi movl%ebx, (%edi) MOVL%edx, 4 (%edi) movl%ecx, 8 (%edi) pushl $buffer pushl $output printf Addl $8,%esp PUSHL $ exit In the following three cases where the entry is _start,main,xx

If the assembly language to achieve the following C language functions, the compilation environment Ubuntu14.04 (32-bit).#include voidSwapint*p,int*q) { intTMP = *p; *p = *Q; *q =tmp;}intMain () {intA[] = {3,0,5,1,4,6,2,9,8,7}; intI, J; for(i =0; I Ten; i++) { for(j = i +1; J Ten; j + +) { if(A[i] >A[j]) {Swap (a[i], A[j]); } } } intK; for(k =0; K Ten; k++) {printf ("%d\n", A[k]); } return 0;} Assembly Code SORT.S . Section.

Linux Kernel Analysis Course summaryName: Wang ZhaoxianStudy No.: 20135114Note: Original works reproduced please specify the source + "Linux kernel analysis" MOOC course http://mooc.study.163.com/course/USTC-1000029000First, how the computer works 个人理解：计算机就是通过和用户进行交互，执行用户的指令，这些指令存放在内存中，通过寄存器存储，堆栈变化，来一步步顺序执行。Second, the storage program computer working model1.冯诺依曼体系结构—存储程序计算机 硬件角度（主板）：通过cpu中IP寄存器指向一个代码段运行某些指令；寄存区，指向内存的某一块区域（代码段） 程序员角度：将cpu抽象为一个for循环，只是执行下一条指令，从内存中取到下一条指令的内容。内存保存指令和数据，cpu

Introduction EFS Web server is a software that can manage server files over a Web side, and sending a GET request too long can trigger a buffer overflow vulnerabilityAnalysis Source: https://www.exploit-db.com/exploits/39008/ Experimental Environment WinXP SP3 Chinese versionEFS Web Server7.2Immunity DebuggerWinDbgIdaMona Vulnerability Analysis Because the author uses the address of the overlay Seh program in ImageLoad.dll, no ASLR, so the use of more stable, open on the pop-up calculator We w