Course Solutions Uncategorized (Solved) : Consider Following C Code Compiled Run X64 Procedure Prints Prompt String Terminal Reads L Q32396581 . . . .

(Solved) : Consider Following C Code Compiled Run X64 Procedure Prints Prompt String Terminal Reads L Q32396581 . . . .

 

Consider the following C code which is compiled and run on x64. The procedure prints a prompt string to the terminal then reads a line of input using gets. char askO char buf [5]; puts (Yes or no? ); gets (buf); return buf to]; A programmer has examined the assembly code and sketched the stack frame as follows. The lowest byte of each quadword is on the right.) return address (8 bytes) unused (3 bytes) buf (5 bytes) hrsp 2 marks) Based on the above information, how many characters can be typed as the input line without overwriting the return address on the stack? Do not count the newline as one of the input characters 3 marks) Write an attack input line that would cause the program to execute a procedure at address 0x742B4F31. Briefly explain your answer.

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