Overflow participants Sept 2

Jul 20, 2014

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Overflow participants Sept 2

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BUFFER OVERFLOW

BUFFER OVERFLOW. Tsega Gebreyonas Sunny Choi CS 265 November 18, 2003. Overview. The Basics Attacks exploiting buffer overflow Prevention and countermeasures Recent Case Studies Conclusion and Observations. Why Study Buffer Overflow?. Vulnerability since the 1970s

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Overflow

Overflow. Range of whole numbers We can check the range of whole numbers of a computer using the following formula: Example, for an 8-bit, the range is as follows: -2⁸⁻¹ to +2⁸⁻¹ - 1 = -2⁷ to +2⁷ - 1 = -128 to +127. What is overflow?

410 views • 15 slides

Overflow

Overflow. Signed binary is in fixed range -2 n-1  2 n-1 If the answer for addition/subtraction more than the range, it is overflow Two situation where overflow can happen: Positive + positive = negative (enough n-bit) Negative + negative = positive(more than n-bit). Overflow.

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OVERFLOW

OVERFLOW. By Chris Tomlin. And overflow in me Jesus Over flow in me Pour Your Spirit out Jesus Overflow in me. Open my eyes so I can see Your glory Open my ears to hear Your voice more clearly Open my heart Lord and let it beat with Yours Beat with Yours.

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Buffer Overflow

Buffer Overflow. Maddikayala, jagadish. CSCI 5931 Web Security Prof. T. Andrew Yang Monday Feb. 23. What is Buffer Overflow?. A buffer is a contiguous allocated chunk of memory, such as an array or a pointer in C

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Chapter 2: Design of Overflow Structures

Chapter 2: Design of Overflow Structures. 2.1 Overflow Structures. 2.1.1 Overflow Gates: The overflow structure has a hydraulic behavior that the discharge increases significantly with the head on the overflow crest. Remember that Q=CLH 3/2 .

2.03k views • 134 slides

Buffer Overflow

Buffer Overflow. Prabhaker Mateti Wright State University. example3.c. void function(int a, int b, int c) { char buffer1[5]; char buffer2[10]; int *ret; ret = buffer1 + 12; (*ret) += 8; } void main() { int x; x = 0; function(1,2,3); x = 1; printf("%d ",x);

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Buffer Overflow

Buffer Overflow. The crown jewel of attacks. Buffer Overflow. Remains the principle method used to exploit software by remotely injecting malicious code It remains to be the “Crown Jewel of Attacks.”

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Buffer Overflow 2

Buffer Overflow 2. CSE 825. Memory Model. Unix memory Text/Data, generate by compiler BSS - Block Started by Symbol, static variables Heap, run-time dynamic allocated. Stack, local variables, argument, etc. Windows (Similar). #include <stdio.h> int main(char argc,char *argv[]) {

628 views • 54 slides

Buffer Overflow

Buffer Overflow. Introduction. On many C implementations, it is possible to corrupt the execution stack by writing past the end of an array. Known as smash the stack. It can cause return from the routine to jump to a random address.

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Overflow Handling

Overflow Handling. An overflow occurs when the home bucket for a new pair (key, element) is full. We may handle overflows by: Search the hash table in some systematic fashion for a bucket that is not full. Linear probing (linear open addressing). Quadratic probing. Random probing.

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OVERFLOW CHARTS

OVERFLOW CHARTS. Investment Choices: Where to Invest TODAY in 2013? Liquidity - causes volatility - comes at a price - is not required for entire portfolio Hard to beat 4%/year !! Well oiled marketing machine Private Equity an option ! Did your RRSP grow 50% in 10 years ?. Liquid

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“The Overflow”

“The Overflow”.

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Detecting Overflow

Detecting Overflow. No overflow when adding a positive and a negative number No overflow when signs are the same for subtraction Overflow occurs when the value affects the sign: overflow when adding two positives yields a negative or, adding two negatives gives a positive

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Sept. 18 Sept. 25 Oct. 2

Sept. 18 Sept. 25 Oct. 2. Lesson 3 - MERCY

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Sept. 2, 2011

Sept. 2, 2011. You need: Paper/pencil HW – Frayer terms HW tonight…review notes! WARM UP: The body is organized into five levels (like our foldable). What are they? Give an example of each. Learning Objective. You should be able to… Identify the five levels of organization.

281 views • 26 slides

Overflow Handling

169 views • 14 slides

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