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buffer-overflow

jmp short 0x0 causing loop forever

I am told that the instruction "jmp short 0x0" which translates to the object code '\xeb\xfe' causes a process to loop forever. How exactly does this work?

Solution

  • The instruction will elicit a jump back to itself. \xeb\xfe translates literally to "Jump ahead -2 bytes from the start of the next instruction." Since this instruction is itself 2 bytes long, the jump destination will be the jump instruction itself.