jmp linux

, wparam, lparam) // empty Hook Function{ Return (callnexthookex (g_hhook, ncode, wparam, lparam ));}Hookapi2_api bool installhook () // outputs the function of installing an empty hook{G_hinstdll = loadlibrary ("hookapi2.dll ");G_hhook = setwindowshookex (wh_getmessage, (hookproc) Hook, g_hinstdll, 0 );If (! G_hhook){Messageboxa (null, "set error", "error", mb_ OK );Return (false );} Return (true );}Hookapi2_api bool uninstallhook () // output the Yu in the hook function{ Return (unhookwindowsh

Jump instructions are divided into three categories:First, unconditional jump: JMP;Second, according to the value of CX, ECX Register jump: JCXZ (CX is 0 jump), JECXZ (ECX for 0 jump);Three, according to the EFLAGS register flag bit jump, this too many.JMP Unconditional Transfer Instructions1, the direct short transfer within the paragraph 2, a direct near-transfer within the paragraph 3, within the paragraph near the transfer of 4, the direct transfe

Calculation of jmp distance of E9: distance = destination address-(current address + 5) (plus 5 is because the JMP command occupies a total of 5 words, actually the destination address minus the end address of the JMP command, that is, the current address + 5If the target address is f1e0b63eThe current address is 8093c6d8.Distance = f1e0b63e-8093c6d8-5 = 714cef61

In assembly, $ is used to obtain the address where $ is located. Therefore, JMP $ is an endless loop. Unless Interrupted, and the interrupted service program will be executed again. However, it should be noted that the returned address is still JMP $, rather than its The next statement. In JMP $ execution, the address of the

① JMP is not responsible for scheduling. It does not save any information, and it does not consider turning back. Skip this step.② Call, save EIP, and so on, so that the program can jump back. RET is the inverse process of call and the process of turning back. This is an inherent CPU command, so we do not need to save the information. Run the command directly.③ Privilege-level transfer within the same task, which is similar to ②, but you need to prepa

1. The difference between JMP is that one is intra-segment call and the other is inter-segment call. 2. The call is very different, because the call will have an impact on the stack:(1) The call's near call will not change the stack used, but the stack content has changed: the next command is pushed into the stack; if there is a parameter, the parameter is pushed into the stack.(2) The Remote Call of call changes the stack used. Because the stack use

Tag: instruction equals Win32 html WWW htm greater than lag strongJump instructions are divided into three categories:First, unconditional jump: JMP;Second, according to the value of CX, ECX Register jump: JCXZ (CX is 0 jump), JECXZ (ECX for 0 jump);Three, according to the EFLAGS register flag bit jump, this too many.Instructions to jump according to the flag bit:JE or equal to the jumpJNE ; not equal to the jumpJZ ; for 0 then Jumpjnz ; not 0 jumps

Jmp selector: offset. The selector may indicate a segment descriptor or a gate descriptor. The cpu executes this command as follows: The above is my understanding of the jmp selector: offset execution process. In fact, the call selector: offset is similar, but the stack of cs and eip is added at the beginning and end, And the stack is output. (The arrow shown in the figure is a bit eye-catching. I can

Virus name: Trojan-PSW.Win32.QQPass.ajo (Kaspersky)Virus alias: worm. win32.pabug. CF (rising star), win32.troj. qqpasst. ah.110771 (drug overlord)Virus size: 32,948 bytesShelling method: UPXSample MD5: 772f4dfc995f7c1ad6d1978691190cdeSample sha1: e9d2bcc5666a3433d5ef8cc836c4579f03f8b6ccAssociated Virus:Transmission Mode: Spread through malicious web pages, other trojan downloads, USB flash drives, and mobile hard drives Technical Analysis============ After the trojan is run, copy itself:Cod

YourselfProgramTo share with you. It's dangerous to remember sprintf! VC ++ 2008 in debug mode # Include This program gets stuck when it is executed to free, and F11 is used for debugging until it reaches the assembly language. JMP _ vec_memzero; Use fast zero sse2 implementation The system stops and displays "No information available for the current location ".Source code". Cause: Invalid Memory Access, subscript out of bounds.

in Linux we can use the GDB debugger can also use objdump this tool, of course, there are other tools, but here I will not say, and then open the file in hexadecimal we can use XXD, We make a hex-mode change to the file by calling Xxd inside the vim, and of course there are other hex editors, and I'm not going to say it, because I'm also playing, after all, I'm still learning Win32 API (my real egg hurts), so let's start with a simple program.Let's l

Research on viruses in Linux-general Linux technology-Linux programming and kernel information. The following is a detailed description. 1. Introduction This article discusses how to modify an ELF file to implement redirection of shared library calls. Modifying the program connection Table of an executable file allows an infected file to call external functions.

kernel data address is accessible. /* These are macros */ S_cli: mov $0, sf1f S_iret: Push % DS Pushl % eax Pushl % edX Movl $ kernel_ds, % edX MoV % dx, % DS CLI Movl sfreq, % edX Andl sfmask, % edX Bsrl % edX, % eax JZ not_found Movl $0, sf1f STI JMP sfidt (, % eax, 4) Not_found: movl $1, sfif STI Popl % edX Popl % eax Pop % DS Iret S_sti: pushfl Pushl $ kernel_cs Pushl $ done_sti S_iret Done_sti: When an interruption occurs, the interrupt handler