understanding basics of buffer over flow?

[Namuchil]

We are doing a many task over the computer at simultaneously. The computer sometimes due to the multitasking over the computer then the overflow condition occurs. In the over flow condition the performance of the is very slow computer. What is over flow condition I never understand? And how it comes in the system. If anybody have knowledge about the overflow condition the please reply me soon.

[Lemog]

In computer security and programming a buffer overflow or buffer overrun is an occur where a program while writing data to a buffer overrun the buffer boundary and overwrites adjacent memory. This special case violation of memory safety. Buffer overflow can be trigged by inputs that are designed to execute the code or alter the way the programs operate. This may result in erratic program behavior, including memory access errors, incorrect result, a crash, or a breach of system security.

[addie]

A buffer overflow occurs when data written to buffer, due to insufficient bound checking. Corrupts data values in memory addresses adjacent t allocated buffer. Most commonly this occurs when copying a string of character from one buffer to another. Buffer flows have been causing serious security problems for decades. A buffer over flow problem is based in memory where the program stores in data.

[Wguy2008]

In simple word we can say buffer overflow is a condition in program whereby the function attempts to copy a more data in to buffer than it can hold. In technically speaking, buffer overflow is result of lack of bounds checking on the size of input being stored in a buffer array. When a program writes past the bound of a buffer this is called buffer overflow. When this happen the next contiguous chunk of memory is over written.

[teenQ]

When computer writing to buffer, C program must care not to store more data in the buffer than it can hold .just as glass can only hold so much water. A buffer can hold so many bits. If you put too much in glass the extra water go somewhere. Similarly if you try to put more data n buffer than the fits, the extra data go somewhere and you might not always where it goes. When contiguous chunk of the some data type are allocated the memory region is known as buffer