and long string "looooooooooooong buffer.
First, p and last are set:
-P points to the buffer at the 0x08CCC965 address-Last point to 0x08CCC965 + 3-1 = 0x08CCC967
Then, start processing "% c", p points to the address plus the size of a char and a space:
P = 0x08CCC965 + 2 = 0x08CCC967
Then, the width and precision are set to-1. Then process "% s ":
-Set slen to 21 (using strlen ()).-If width and precision are false, set them to 21.
Last minus the new width value and less than p:
0x08CCC967-21 =
Here is the steps to enable a custom theme using the manual method described here:Https://github.com/edx/edx-platform/wiki/Stanford-ThemingFirst create the base VM:mkdir fullstackcd fullstackcurl -L https://raw.githubusercontent.com/edx/configuration/master/vagrant/release/fullstack/Vagrantfile > Vagrantfilevagrant plugin install vagrant-hostsupdaterexport OPENED
ran to system airspace. The code shown in the ollydbg Disassembly window is as follows: 77d3213c 6a 0C push 0c77d3213e 68 a021d377 push user32.77d321a077d32143 E8 7864 feff call user32.77d185c0 What should I do? Don't worry. Let's press Alt + F9: 00401328 |. E8 a5000000 call crackhea.004013d2; key: Press F7.0040132d |. 3bc6 CMP eax, ESI; Comparison0040132f |. 75 42 jnz short crackhea.00401373; wait until it is finished The cursor stops at the command at the 00401328 address. Now we press F7
From: http://blog.codingnow.com/2005/10/vc_memcpy.html
In many compilers, memcpy is an intrinsic function, that is, this function is implemented by the compiler. It is easier to be optimized during compilation than the inline function. The compiler can make multiple versions based on whether the memcpy parameter is a constant or a variable to achieve optimal performance. This cannot be done using inline or template.
Let's take a look at the optimization of memcpy by VC. (Vc6)
Void Fo
unit opened by SWAp in the stack as the form parameter X and Y. This can be seen from the following Assembly Code (the author adds the annotation ):22: void main ()23 :{............13: int A = 1, B = 2;00401088 mov dword ptr [ebp-4], 100401_f mov dword ptr [ebp-8], 214: int * P1 = ;00401096 Lea eax, [ebp-4]00401099 mov dword ptr [ebp-0Ch], eax15: int * P2 = B;00401_c Lea ECx, [ebp-8]0040366f mov dword ptr [ebp-10h], ECx16: swap (P1, P2 );004010a2 mov edX
(const char *,);9. This function is not called to clear the stack because it does not know how many parameters there are.10; instead, the caller is responsible for clearing the stack.11. Data12 sztextfmt byte '% d', 0; this is used for type conversion. It is the same as that of C, and the character is of the byte type.13a DWORD 1000; hypothesis14B DWORD 2000; the processed values are all double-character, no difference between int and long.1516; /**///////////////////////////////////// ////////
Use seh for reverse trackingI don't want to perform literacy for seh hereWhen a program is debugged and encounters INT 3, the debugger will be interrupted.When a program runs normally and encounters INT 3, an exception occurs. The system reports an error. If seh is setFor the moment, no error is reported, and the processing permission is handed over to Seh. We can make some effort in it to determine whether the software has been tracked.
The following is a routine I wrote:
. 386. Model flat, std
After reviewing the compilation principles, yundun issued a question like this:SourceProgram:
Code highlighting produced by Actipro CodeHighlighter (freeware)http://www.CodeHighlighter.com/--> 1 Void F ( Int A, Int B, Int C, Int D, Int X, Int Y, Int Z) 2 { 3 While ( B) 4 { 5 If (C D) 6 X = X + Z; 7 Else 8 X = Y - Z; 9 } 10 }
The maximum optimization compiled with GCC 3.3.5 is:
Code highlighting produced by Actipro CodeHighl
mov dword ptr [I], eax; assign 1 to I00411a65 mov ECx, dword ptr [I]; load I into ECx. In this case, ECx = 100411a68 add ECx, 1; ECx = ECx + 1, ECx = 200411a6b mov dword ptr [I], ECx; assign ECx to I, at this time I = 200411a6e mov edX, dword ptr [I]; load I to edX, (EDX) = 200411a71 add edX, 1;
corresponding bit to 1# '0' -> force to 0# 'x' -> Get a safe value (pass through and mask with the default policy)# 'k' -> pass through the host bit value# 's' -> as 'k' but preserve across save/restore and migration# # Expose to the guest multi-core cpu instead of multiple processors# Example for intel, expose a 8-core processor :#cpuid=['1:edx=xxx1xxxxxxxxxxxxxxxxxxxxxxxxxxxx,# ebx=xxxxxxxx00010000xxxxxxxxxxxxxxxx',# '4,0:eax=001
This is a secret level that needs to be triggered by actively invoking the Secret_phase function and can be invoked via call secret or jump *0x address.Paste out function: (fun7 function part without comments, and then continued on the handwritten figure to parse the function)0000000000401204401204: - theEc , Sub$0X8,%RSP401208: - -FfTest%rdi,%rdi 40120b: About2bJE 401238;if%rdi==0,ret. 40120d: 8b - mov(%rdi),%edx
array starts at 0, when I equals 0 o'clock, the address we access is XAFor example, the following array declaration: Char a[12]; Char *b[8]; Double c[6]; Double *d[5];We can get the following information: note Because both B and D are declared arrays, in IA32, pointer variables occupy 4 bytes of memory space. such as the following code:#include Printing results are: From the above we can also see that the starting address is 6356736, that is, the address of a[0], the back of the acce
/**author:davidlin*date:2014-11-11pm*email: [email protected] or [email protected]*world:the City of SZ, in China*ver:000.000.001*history:editor time do1) Linpeng 2014-11-11 created this file!2)*/Linux-0.11 Memory Management module is more difficult to understand in the source code part, now the author's personal understanding publishedFirst hair Linux-0.11 kernel memory management get_free_page () function analysisHave time to write other functions or files:)/** Get Physical Address of first (a
/**author:davidlin*date:2014-11-11pm*email: [email protected] or [email protected]*world:the City of SZ, in China*ver:000.000.001*history:editor time do1) Linpeng 2014-11-11 created this file!2)*/Linux-0.11 Memory Management module is more difficult to understand in the source code part, now the author's personal understanding publishedFirst hair Linux-0.11 kernel memory management get_free_page () function analysisHave time to write other functions or files:)/** Get Physical Address of first (a
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