Assembly Language Primer For Hackers (Part 2) Virtual Memory Organization

Assembly Language Primer For Hackers (Part 2) Virtual Memory Organization

Description: This is the second video in the "Assembly Primer for Hackers" series. Please begin here with Part 1, if you have not already done so before watching this video.In this video we take an in-depth look at virtual memory organization concepts. The entire discussion is explained by taking a live example using the SimpleDemo.c code. 

Code:

#include
#include

int add(int x, int y)
{
        int z =10;

        z = x + y;
        return z;
}

main(int argc, char **argv)
{
        int a = atoi(argv[1]);
        int b = atoi(argv[2]);
        int c;
        char buffer[100];

        gets(buffer);
        puts(buffer);

        c = add(a,b);

        printf("Sum of %d+%d = %d\n",a, b, c);

        exit(0);

}

We look at how one can use the /proc/PID/maps to peek into the layout of a program's virtual memory and interpret useful things. Also, we show how the Address Space Layout Randomization (ASLR) works in the latest 2.6 kernels and why this is significant from a security point of view. We also show how this can be disabled at runtime if the need be. This video is very important from an code exploitation perspective as it teaches us how to check for the presence of ASLR on a given system.

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