All Questions
Tagged with buffer-overflow arrays
16 questions
2
votes
1answer
87 views
Overwriting data via array vulnerabilities
I am trying to demonstrate a buffer overflow via an array index (when there isn't any bounds checking). What I am trying to do is change my bool authenticated = false to true by passing in a bad ...
0
votes
1answer
82 views
buffer overflow while writing to char array
Could anyone help me out here?
I don't really know why this code doesn't work properly.
Just want to split a string in two. However, somehow strange thing happen that it writes 6 char instead of 3 ...
2
votes
3answers
184 views
How to avoid pressing enter twice when using getchar() to clear input buffer?
I have this program:
#include <stdio.h>
#define SIZE 19
int main(){
char string[SIZE];
while (string[0] != 'A'){
printf("\nEnter a new string.\n");
fgets(string,SIZE,stdin);
int storage ...
0
votes
1answer
94 views
BufferOverflowException while sending data of specific size
I have bunch of keys and values that I want to send to our messaging queue by packing them in one byte array. I will make one byte array of all the keys and values which should always be less than 50K ...
1
vote
1answer
102 views
C++ 3D array to 1D causes heap-buffer-overflow
I want to give a minimal example. If the code provided is not enough, please tell me what else you need. It's nothing super secret ;)
Consider the following two implementations:
Using 3d array:
.h
...
-7
votes
2answers
76 views
values of array gets changed automatically after taking string input
#include <iostream>
#include <math.h>
using namespace std;
int main()
{
long int m,i;
cin>>m;
float first=0,second=0,disp=0;
int arr[m];
char ch[m];
for(i=0;...
0
votes
1answer
41 views
Behavior of char pointer [duplicate]
I am really confused about the following:
char *list = malloc(sizeof(char));
list[0] = 'a';
list[1] = 'b';
printf("%s\n", list);
My expectation was some kind of undefined behavior, because list has ...
0
votes
2answers
84 views
What explains this behavior of C compiler w.r.t string initialization?
The following code doesn't generate a null terminator
/* Case 1 */
#include <stdio.h>
void main () {
char wbuf[16] = "0123456789abcdef";
printf("%s\n", wbuf);
}
See the relevant parts ...
-1
votes
4answers
92 views
Buffer over-run prevention for stack based buffers
I'm writing a C library that provides wrapper functions to strcpy, strcat, gets, etc to prevent buffer overflow attacks. Basically what I do is keeping track of the size of all buffers and prevent ...
0
votes
4answers
193 views
How does C treat Buffer overflows?
I understand that in C, there are arrays that can be given a length at declaration. I want to know if those length declarations are simply for other programmers to see and understand the use of, or if ...
2
votes
1answer
114 views
Overflowed buffer data does not get stored contiguously
I have the following code to simulate buffer overflow.
Edit: I missed an important step in the code below. As the discussion progressed that the variable c is getting modified.
void function (int fd,...
1
vote
2answers
385 views
Multiple fscanf
I have written the following program that is intended to read a string from a file into variable "title":
#include <stdio.h>
#include <stdlib.h>
int main()
{
int m, b;
char *...
1
vote
1answer
14k views
How can I store String value in char array in C?
I have char array to store string values. I wanted to store the value of a string variable into the char array.
char Password[30];
char User[2];
int i;
for(i=0; i<5; i++) {
printf("Enter ...
2
votes
1answer
2k views
Comprehensive and clear NOP sled technique explanation needed
I have browsed the internet a lot and still could not understand the way it works
No success with this link either:
How does a NOP sled work?
Okay, let's say we have a buffer char a[8]; in the ...
3
votes
5answers
8k views
Array overflow (why does this work?)
Okay, so I was teaching my girlfriend some c++, and she wrote a program that I thought wouldn't work, but it did. It accesses one more element in the array then there is (for instance, accessing array[...
1
vote
3answers
350 views
Will Insure++ detect array overflows in a C structure on the heap?
I have been trying to find the best programs to detect buffer overflows in a C program. In particular I am looking to detect overflows of a char array that exists within a C structure on the heap.
...
