liaison edi

The place that strcpy didn't take into account Original posted Address:Http://eparg.spaces.live.com/blog/cns!59BFC22C0E7E1A76!1498.entryOriginal Paste Time:2006-08-16Original Paste Author:EpargThe discussions of the year were in: Http://eparg.spaces.live.com/blog/cns!59BFC22C0E7E1A76!533.entry When Http://eparg.spaces.live.com/blog/cns!59BFC22C0E7E1A76!875.entry first considered the performance of strcpy, only 4bytes copies were considered. But ignoring a key question is how to judge the end of

, Then use SoftICE to set a breakpoint on the address, SoftICE should be immediately broken, You'll see mov DWORD PTR ds:[eax+ecx*8+eb4],edi, In the client, the position is 0x4b2c74, You can change the course of the game, Put mov DWORD PTR ds:[eax+ecx*8+eb4], EDI changed into a E9 xx xx xx xx 90 90, JMP the free address between the rsrc and. Data in the process. The code (xx xx xx xx) + 0x4b2c74 + 5 is modi

, there will be no correct working ideas; without correct working ideas, there will be no correct work objectives; without correct work objectives, there will be no correct guiding ideology; however, the class will not grow, and the students will not grow. At present, the class lacks such things. Responsibilities of Class Cadres: 1. Shift Leader: responsible for all-round work, coordination, and assistance to other classes to complete their work. 2. Deputy shift leader: assists the shift leader

("[+] Trying to unload: % s", argv [2]);Delete_driver (SC, name );}Getch ();}/* Wdl. c ends */ Driver samples with Vulnerabilities This is a sample code with a vulnerability driver. We will try to attack it later in this article. This driven framework model is based on Iczelion. ; Buggy. asm start. 386. Model flat, STDCALLOption casemap: NONEInclude d: masm32demodewindows. incINCLUDE incstring. INCINCLUDE inctstruc. INCINCLUDE inctddk. INCINCLUDE inctoskrnl. INCINCLUDE incNtDll. INCIncludelib d

Kifastcallentry routine:Nt! KISYSTEMSERVICE+0X5A:805424AB C74508000ddbba mov dword ptr [ebp+8],0badb0d00h805424B2 895d00 mov dword ptr [EBP],EBX805424B5 897D04 mov dword ptr [Ebp+4],edi805424b8 F6462CFF test byte ptr [ESI+2CH],0FFH805424BC 0f858afeffff jne nt! Dr_kss_a (8054234c)805424C2 FB STI805424C3 e9e7000000 jmp nt! kifastcallentry+0x8f (805425AF) ; jump to KifastcallentryThen take a look at what's being jumped in the kifastcallentry:Nt! kifastcallentry+0x8f:805425AF 8bf8 mov

References: %defineparamesp124% definesrcparam0 % definedstparam4 % definelenparam8 % unknown: Unknown, [src]; sourcearraymovedi, [dst]; destinationarraymovecx, [len]; numbero References: %%%%%%definedstparam4% definelenparam8 % defineCACHEBLOCK400h _ fast_memcpy9: pushesi pushedi pushebx movesi, [src]; sourcearray movedi, [dst]; destinationarray movecx, [len]; numbero Reference: Global _ fast_memcpy9 % Define param esp + 12 + 4% Define src param + 0% Define dst param + 4% Define len param

information is used for debugging: Cmp [esi + eax-06h], 'kcuf' Jne DisableOnBusy 　　 ENDIF 　　 Determine whether the file exists. if not, switch to DisableOnBusy. Cmp word ptr [ebx + 18 h], 01 h Jne DisableOnBusy 　　 ; Get file attributes Mov ax, 4300 h Int 20 h; call IFSMgr_Ring0_FileIO to obtain file attributes IFSMgr_Ring0_FileIO = $ Dd 00400032 h; call number 　　 Jc DisableOnBusy Push ecx 　　 ; Get the IFSMgr_Ring0_FileIO address Mov edi, dword ptr (I

relatively * sure everything is OK. this routine will be over-* written by the page tables. * // ** the following section sets the Interrupt Descriptor Table subroutine setup_idt. ** Set the idt of the Interrupt Descriptor Table to have 256 Items and point to the ignore_int interrupt gate. Then load the interrupt * Descriptor Table register (using the lidt command ). Install the service after a real and practical disconnection door. Enable the interrupt when we think everything is normal elsewh

code. The complete code for searching getprocaddress in Kernel32 is as follows: Push ESI; ESI = va kernel32.base; EDI = RVA k32.pehdrMoV EBP, ESIMoV EDI, [EBP + EDI + Peh. datadirectory] Push EDI ESI MoV eax, [EBP + EDI + peexc. addressofnames]MoV edX, [EBP +

00 ................ 0x00401010 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ 0x00401020 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ All are 0.1.1.2 dynamic compilation According to the online materials, this section is related to incremental links and dynamic compilation. Check the linker parameters to ensure that the incremental link is opened for verification. Insert a test function before the main function and call it in main: Int add (int A, int B) { Return A +

, special registers (control, debug, segment)Can only be transmitted to the general register, or to the content transmitted from the General Register.When referencing a label:Cases:. Section. DataValue. int 100_start:MOVL value,%eaxMOVL $value,%eaxMovl%ebx, (%edi)MOVL%EBX, 4 (%edi)Where: Movl value,%eax simply passes the memory value currently referenced by the tag value to EAXMOVL $value,%eax passes the me

"All rights reserved, please specify the source of the reprint." Source: http://www.cnblogs.com/joey-hua/p/5598451.html "In the fork function of the previous article, we first call Get_free_page to request a page of memory for the new task's data structure, in MEMORY.C:/** Gets the first (actually the last 1:-) free pages and marks it as being used. If there is no free page, * returns 0. */////take the Idle page. If no memory is available, 0 is returned. Input:%1 (ax=0)-0;%2 (Low_mem),%3 (cx=pag

, but what else can I print?This is actually the value of the Print program counter.First say register, besides $pc, there are%ESP,%EDP and so on,Specifically can print those, but also involved in another command, look at one example:[CPP]View PlainCopy (GDB) I (NFO) r (eg) (GDB) EAX 0x80484f0 134513904 ECX 0xbffff304-1073745148 EdX 0xb 11 EBX 0xb7fc2ff4-1208209420 ESP 0xbffff240 0xbffff240 EBP 0xbffff268 0xbffff268 ESI 0x0 0 EDI

and an internal counter of the repeated (REP) prefix command and LOOP command.(6) edx is always used to place the remainder produced by integer division.(7) esi/edi are called "source/destination index register" (source/destination index), because in many string operation commands, DS: ESI refers to the source string, While ES: EDI points to the target string.On a 32-bit platform, ESP is reduced by 4 bytes

CPU switches from user mode to privileged mode, then jump to the kernel code to execute the exception handling program.In the "B INT" command, the value 0x80 is a parameter. In exception handling, the parameter determines how to handle the problem. In the Linux kernel, an int 0x80 exception is called a system call.The values of C eax and EBX registers are two parameters passed to the system call. The value of eax is the system call number, 1 indicates _ exit call, and EBX indicates the paramete

+ 31o. Text: 000103dc mov ECx, [esp + 8]. Text: 000103e0 and dword ptr [ECx + 18 h], 0. Text: 000103e4 xor dl, DL. Text: 000103e6 mov dword ptr [ECx + 1ch], 1. Text: 000103ed call DS: iofcompleterequest. Text: 000103f3 XOR eax, eax. Text: 000103f5 retn 8 Ntstatus sdbgmsgcreate (pdevice_object pdeviceobject, pirp){IRP-> iostatus. Status = STATUS_SUCCESS;IRP-> iostatus. Information = 1;//// The iofcompleterequest routine is the _ fastcall call method.// Transfer parameters using ECx and EDX//Ioco

same as that of the function I wrote (you can also say that the exponent in the function I wrote is: change the = 1/gamma statement to exponent: = gamma, which is the same as the setgamma method of GDI + ): Procedure imagesetgamma (VAR data: timagedata; GAMMA: single); var I: integer; exponent: Double; gammatab: array [0 .. 255] of byte; begin exponent: = 1/gamma; // This sentence is changed to exponent: = gamma;, which has the same effect as the setgamma parameter of GDI + for I: = 0 to 255 do

The code from chapter 7 of Intel assembly language programming (fifth edition) uses the AAA (ASCII adjust after addition) command to adjust the results after the ASCII addition. The source code is as follows: Title ASCII addition (ascii_add.asm) ; Perform ASCII arithmetic on strings having ; An implied fixed decimal point Include irvine32.inc Decimal_offset = 5; offset from right of string . Data Decimal_one Byte "100123456789765"; 1001234567.89765 Decimal_two Byte "900402076502015"; 900402

the program73d311ab 817e 38 6a030000 cmp dword ptr ds: [ESI + 38], 36a73d311b2 74 1A je short mfc42.73d311ce73D311B4 8B06 mov eax, dword ptr ds: [ESI]73D311B6 57 PUSH EDI73D311B7 8BCE mov ecx, ESI73D311B9 FF50 60 call dword ptr ds: [EAX + 60]; PreTranslateMessage (Message preprocessing)73D311BC 85C0 test eax, EAX73D311BE 75 0E jnz short MFC42.73D311CE73D311C0 57 push edi; message preprocessing returns FALSE73D311C1 FF15 ACB6DC73 call dword ptr ds: [7

I remember writing a HOOK API article (C/C ++ HOOK API (in-depth analysis of the principle-loadlibrarya). The main principle of this article is to construct a code byte, modify the first 16 bytes of the loadlibrarya function, and then jump to the custom function. When you call a normal function, unhook it again. In this way, when you call a function again, the unhook and hook operations appear too frequent. Moreover, the hook and unhook were designed as thiscall at the time. Therefore, maintaini