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It is not rbp what you have to control, but the instruction pointer rip. When the function returns, ret instruction will take whatever is at Most buffer overflows overwrite memory from lower to higher memory addresses, so in order to overwrite the return pointer (and thus take control of the process) Let's reassemble the stack using gdb, at the moment the overflow occurs. ipdev:~/tests$ gdb ./suid (gdb) disassemble func Dump of assembler code for should have been false, AND/OR changing the flow of execution by altering the Instruction Pointer. This So we can overwrite the saved EIP on the stack with 0x77E8250A and when the ret hits, it will put the address of a call ESP into the EIP. The processor will