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Linux learning note (1)

-in specs.Target: i486-linux-gnuConfigured :.. /src/configure-V -- With-pkgversion = 'ubuntu 4.3.3-5ubuntu4' -- With-bugurl = file: // usr/share/doc/gcc-4.3/readme. bugs -- enable-languages ages = C, C ++, Fortran, objc, OBJ-C ++ -- prefix =/usr -- enable-shared -- With-system-zlib -- libexecdir =/usr/lib -- without-included-gettext-- Enable-threads = POSIX -- enable-NLS -- With-gxx-include-Dir =/usr/include/C ++/4.3 -- Program-suffix =-4.3 -- enable-clocale = GNU -- enable-libstdcxx-Debug -- en

Bzoj3879: SVT

Question: Give a string and query multiple groups. The length and number of LCP with some suffixes must not exceed 1e6.Question: SVT is the suffix virtual tree and suffix virtual tree. Considering the suffix tree LCA, the LCP length can be obtained. However, the number of queries may be large and it cannot be traversed each time, therefore, we need to create a virtual number in the virtual tree DP, for a node to consider the contribution, for all the child trees, the product of the two counts mu

Lightning fast! Saving "encrypted data" is simple.

troublesome, we use a folder sniffing tool that has been encapsulated and has a GUI for testing. Download a "XX folder encryption Protector", which has nearly 0.2 million downloads and is widely used. We have created a file folder on the fdisk, and a 1.txt file in the folder. The above content is used as an encryption sample. "XX folder encryption and protection" is easy to use. after entering the program with the default password, you can set hidden

Week Five study notes

selected:1.IC Illumination Control Element Select model CCT15284Http://www.schneider-electric.cn/zh/product-range-selector/843-ic-zhaomingkongzhiyuanjian/?filter= business-5-zhinengshenghuokongjianparent-category-id=1600Power consumption: 6VAMaximum switching current: A-250 V AC PF = 1A-250 V AC PF = 0.6Rated operating voltage: V (+10 -15) AC 50/60 HzTime delay: ≥ 60 seconds (delay before disconnection)≥ 60 seconds (delay before switching on)2. Uninterruptible power supplyBk1000y-chAPC back-ups

Ask questions in communication--focus on your needs

Common Scenarios for communication In the work often need to communicate with other groups or departments, our own side of the need for what interface, whether the other side can provide? I used to hate writing a requirement document in school and came out to work to know that the requirements document is a protector. my experience; Background: Because new projects require new SMS templates to send verification codes.

Introduction to Qt 5

support for IPV6 as well as two modes of networking. The vast majority of applications that use host names and network layer transport protocols can now obtain IPV6 transport support. These applications can choose to accept both IPV4 and IPV6 connections, or only one of two connection types. In an HTTP connection made using Qnetworkaccessmanager, the IPV4 and IPV6 connections are attempted in parallel, and the first successful connection is put into use. This is particularly useful for environm

Spoj-vfmul-very fast multiplication FFT accelerates high-precision multiplication

Spoj-vfmul:https://vjudge.net/problem/spoj-vfmulThis is an FFT for high-precision template problem.Reference: https://www.cnblogs.com/RabbitHu/p/FFT.html#include #include#include#include#include#include#include#include#include#include#includestring>#include#include#include#include#include#include#includeSet>#includeusing namespacestd;//#pragma GCC optimize (3)//#pragma COMMENT (linker, "/stack:102400000,102400000")//C + +//#pragma GCC diagnostic error "-std=c++11"//#pragma COMMENT (linker, "/sta

20165337 Buffer Overflow Vulnerability experiment

Enter the command to install some packages for compiling a 32-bit C program: sudo apt-get update sudo apt-get install -y lib32z1 libc6-dev-i386 sudo apt-get install -y lib32readline-gplv2-devIn Ubuntu and some other Linux systems, the initial address of random heap (heap) and stack (stack) is randomized using address space, which makes it difficult to guess the exact memory address, and guessing the memory address is the key to the buffer overflow attack. So in this experiment, we use the follow

Text overflow two lines to play ellipsis

Two lines-compatible under Google Browser:HTML code class= "contxt-bulka-01">iphone 6,iphone 6S screen Protector teksonic [iphone 6 and iphone 6S iphone 6S iphone 6S]p>CSS Code. CONTXT-BULKA-01 { Display:- Webkit-box; height:35px; Word-break:break-all; text-overflow:ellipsis; -webkit-text-overflow:ellipsis; Overflow:hidden; -webkit-line-clamp:2; -webkit-box-orient:vertical; font-size:16px;}Force a line ellipsis#test { t

Protective が00な Parts について

In the future, the protection of サービスを by けるつもりがないとしても snorkeling material payment わなくてはいけません. もし Finance Economics 済 な things などで bao snorkeling material to めることが, しい は, the city of the maintenance of snorkeling the consciousness mouth でご talking ください.->ヘルパー, Nago-Ward, Nursing and Nursing Staff Foundation training/パート (very diligent), introduction to dispatch, dispatch of the service, and dispatching of the,... in the city of Chiba Do not ask などで to visit the designated cancellation-Qifu visit

To those students who are going to the college entrance examination and have entered the university

the university period is very short, the forefoot into the hind foot out, even if a waste of a day need a great price to make up. This is the final sprint of youth, thus running into the adult society, many better than you have been zhejichensha, how can you win? After that you will no longer be a protected child, and you will be the protector of others, and you must be psychologically prepared for it.The last lesson of the senior year, your teacher

"Safe Hiking" (1): Hacker programming skills

gadgets. In my opinion, the Hack programming Foundation should involve the following aspects:1. C + + programming language;2. Computer memory knowledge;3. Basic knowledge of Intel processors;4. Assembly Language Foundation;5. GDB program Debugging;6. Python programming skills;A brief description is given below.One, C programming languageThe importance of C is that UNIX and Windows systems are mainly written in C, so its underlying core mechanism is C, although the widows system more and more us

OpenWrt Compile error handling record

1. Code copied from Windows to compile error handling, refer to: http://www.360doc.com/content/13/1016/21/3884271_321966616.shtml2. Error compiling Lua-socket Package2.1 Error messagesUndefined reference to ' __stack_chk_fail ' 2.2 Try the workaround:  2.2.1 "-fno-stack-protector" into target_cflags in rule.mk file according to 2.3.1 solution, still appears the errorReason for this scenario error: Because of hierarchical relationships, the "fstack_pro

Registry permission settings

""Nosavesettings" =dword:1 "end do not store SetPoint"2, Hkey_users\. Default\software\microsoft\windows\currentversion\policies\explorer\system"Nodispcpl" =dword:1 "Turn off Monitor console""Nodispbackgroundpage" =dword:1 "Hide background screen""Nodispscrsavpage" =dword:1 "Hide screen protector screen""Nodispappearancepage" =dword:1 "Hide the appearance screen""Nodispsettingspage" =dword:1 "Hide setpoint screen""Noseccpl" =dword:1 "Close password Co

Buffer Overflow Vulnerability Experiment

. The code is as follows:/* STACK.C *//* This program has a buffer overflow vulnerability. *//* Our task was to exploit this vulnerability */#Include #Include #Include IntBoF(Char *str) {Char buffer[12];/* The following statement has a buffer overflow problem */ strcpy (buffer, str); return 1;} int main (int argc, char **argv) {char str[517]; FILE *badfile;badfile = fopen ( "R"); Fread (str, sizeof (char), 517, Badfile); BOF (str); Span class= "hljs-built_in" >printf ( "returned properly\n");

CONFIG.MK analysis of Uboot top layer

=0xffGccincdir: = $ (Shell $ (CC)-print-file-name=include)Cppflags: = $ (dbgflags) $ (optflags) $ (relflags) \-d__kernel__Ifneq ($ (boot_media),)Boot_media_macro = boot_media_$ (Shell echo $ (Boot_media) | tr ' [A-z] ' [A-z] ')Cppflags + =-d$ (Boot_media_macro)endifIfneq ($ (text_base),)Cppflags + =-dtext_base=$ (text_base)endifIfneq ($ (Objtree), $ (srctree))Cppflags + =-i$ (objtree)/include2-i$ (objtree)/includeendifCppflags + =-i$ (topdir)/includeCppflags + =-fno-builtin-ffreestanding-nostdin

PHP code protection-use of ZendGuard _ php instance

This article provides a detailed analysis of the use of zendguard. For more information, see the role of Zend Guard, it is to protect PHP source code from decompiled viewing, unauthorized custom modification, unauthorized use and re-release by means of compilation and processing. In addition, it is developed by PHP's Zend company and is a completely customized protector for PHP. Next, please join me to learn how to use Zend Guard to encrypt and protec

Windows Ops Tips

software that records network device disconnected trafficwhen the network share is limited, you can use Serv_u to build an FTP server to solve the local Area network resource sharing problem. ITSS Information Technology Service standardTelnet Management Server, changing The window server's telnet disconnect command:Tlntadmnconfig Port =3000Encrypting cloud-assisted file sharing securityMobile Desktop Folder - Desktop folder - Properties - location. Switch power failure causes the switch to rest

Nginx Server Open Status page detection service status

=/var/run/nginx.pid--Lock-path=/var/run/nginx.Lock--http-client-body-temp-path=/var/cache/nginx/client_temp--http-proxy-temp-path=/var/cache/nginx/proxy_temp--http-fastcgi-temp-path=/var/cache/nginx/fastcgi_temp--http-uwsgi-temp-path=/var/cache/nginx/uwsgi_temp--http-scgi-temp-path=/var/cache/nginx/scgi_temp--user=nginx--group=Nginx--with-http_ssl_module--with-http_realip_module--with-http_addition_module--with-http_sub_module--with-Http_dav_module--with-http_flv_module--with-http_mp4_module--wi

Modifying the executable properties of the program stack

Recently, several experiments have just been done csapp, in the Bufbomb experiment Level2 and LEVEL3, need to embed the attack code into the buffer and modify the program return address as the beginning address of the buffer, but encountered the problem of the stack is not executable. Because the Ubuntu default stack is not executable. Two ways to modify the executable properties of the program stack are summarized here.Method One: (There is a. C source file) Gcc-g-Z execstack-fno-stack-

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