C: Trace And Debug

Set-up to facilitate for tracing and debugging

Create Tracing Helper Functions

Instead of commenting them:

and manually tracing them later:

Create tracer functions and tag switches to enable the ease to conduct selective testing and debug regions.

Create Timer Helper Functions

Having a timer to check the timing of the specific code portions will also be helpful.

GDB (GNU Project Debugger)

Let’s use an buffer overflow example as an observatory:

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
int main(int argc, char** argv) {
     volatile int cantoverflowme;
     char buffer[64];
     cantoverflowme = 0;
     gets(buffer);
if (cantoverflowme != 0) {
        printf("You OVERFLOW'ed Me\n");
     } else {
        printf("Can't Overflow Me\n");
     }
}
/*
# compile
gcc overflow.c -o overflow  -fno-stack-protector -z execstack -no-pie
-z execstack : Disables Executable Stack
-fno-stack-protector : Disables Stack Canaries
-no-pie : Disables Position…