For example, when a function is called the program (code inserted by the compiler) must store the address of the instruction to return to. So if this is the 32 bit word just before the beginning of the stack, one could do:

void foo() {
  int array[5]; 
  int var = 0; 
  int var2 = 0; // read in user input 
  printf("Enter index and value to write:"); 
  scanf("%i", var); 
  scanf("%i", var2); 
// malicious user might set var to -1 and var2 to an address to execute 
// if say the 32-bit value before the stack variables is the instruction to // return to 
  array[var] = var2
 // return now goes to malicious code 
}

یعنی در انتهای این تابع یک دستور return وجود دارد که توسط کامپایلر به یک آدرس که این تابع را فراخوانی کرده است بر میگردد ما با تغییر این بخش از حافظه به کد مخرب پرش میکنیم و کد را اجرا میکنیم!

یک مثال برای Buffer Overflow Attack 



https://www.thegeekstuff.com/2013/06/buffer-overflow/?utm_source=feedly

با دقت مطالعه کنید :)

https://dhavalkapil.com/blogs/Buffer-Overflow-Exploit/

#buffer_overflow

In web development, a #polyfill is code that implements a feature on web browsers that do not support the feature. Most often, it refers to a JavaScript library that implements an HTML5 web standard, either an established standard (supported by some browsers) on older browsers, or a proposed standard (not supported by any browsers) on existing browsers. Formally, "a polyfill is a shim for a browser API"

https://en.wikipedia.org/wiki/Polyfill_(programming)

The Page #Visibility API is useful for the Web application to know whether it is currently displayed on the front or not, especially to stop resource-intensive UI animations or data refreshing when it is not needed. On the mobile devices, the primary reason for that is to reduce the battery usage.

https://whatwebcando.today/foreground-detection.html

#vscode

1. alt+mouse_click
2. select
3. space

ابزاری مناسب در زمان توسعه کامپونتهای
https://storybook.js.org/

https://storybook.js.org/docs/guides/guide-react/

#debounce func

هنگامی که یک تابع داریم که می خواهیم برای اجرایهای متوالی آن محدویت بگذاریم از debounce استفاده میکنیم

For those of you who don't know what a debounce function does, it limits the rate at which a function can fire. A quick example: you have a resize listener on the window which does some element dimension calculations and (possibly) repositions a few elements. That isn't a heavy task in itself but being repeatedly fired after numerous resizes will really slow your site down. Why not limit the rate at which the function can fire?

#JavaScript #Debounce Function

augmented reality phone call
در آینده نه چندان دور این طور با دوستان خود تماس برقرار خواهیم کرد :)

https://github.com/bvaughn/react-virtualized

https://bvaughn.github.io/react-virtualized/#/components/List

#react_virtualized #large_list

https://blog.logrocket.com/rendering-large-lists-with-react-virtualized-82741907a6b3/

#react_virtualized #large_list

http://airbnb.io/react-dates/?path=/story/daterangepicker-drp--non-english-locale-persian

#date_picker #persian

https://malte-wessel.com/react-custom-scrollbars/
#react #custom #scrollbars

https://github.com/brion/ogv.js/
تلگرام وپ برای پخش فیلم از ابزار فوق استفاده می کند
#ogv #player