Tag: security

Will following program execute successfully ? int main(int argc,char* argv[]){ int *ptr=new int; if(ptr==NULL) exit(1); char *j; for(int i=1;i<=4;i++) { j=argv[i]; int k=atoi(j); if (k!=0){ *ptr=k; delete ptr; } } }

With the size of unsigned integers being 4 bytes, What happens when a negative number is entered? unsigned int i; scanf("%u",&i);

What is the value of j (size of integer is 4 bytes)? int i=987987987; int j= i*10;

The application is receiving input from an external source. Which of the following external sources can be considered safe?

In the following code snippet, how to handle pointer? int main (int argc, char argv[]) { char j; j=argv[1]; int k=atoi(j); /delete here/ return 0; }

Code is vulnerable to buffer overflow attack and

What can go wrong in following code? #include int main(int argc, char *argv[]){ if(argc != 3){ printf("usage: %s [source] [dest]\n", argv[0]); exit(1); } char buffer1[5]; strcpy(buffer1, argv[1]); char buffer2[5]; strcpy(buffer1, argv[1]); char x; FILE *file[2]; file[0] = fopen(buffer1,"r+"); file[1] = fopen(buffer2,"w+"); for(x = 0; x < 2; x++){ if(file[x] == NULL){ printf("error opening file.\n"); exit(1); } } do { x = fgetc(file[0]); fputc(x,file[1]); } while(x != EOF); for(x = 0; x < 2; x++) fclose(file[x]); return 0; }

In the following code snippet, how should a pointer be deleted int main (int argc, char argv[]) { char j=new char[100]; j=argv[1]; int k=atoi(j); /delete here/ return 0; }

A program wants to do some activities with root privileges when it starts up and shuts down. Other activities it does can be done as a lesser privileged user. Which of the options given below is most secure?

What value is stored in *leaf in the program given below? int *myfunc(int tree) { int *node; int i=rand(); if(0==tree/pow(2,i)) node=&tree; else node=&i; return node; } int main(int argc, char * argv[]) { int *leaf; leaf=myfunc(7); }