x86_64/write4/useful_gadgets


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0x000000000040068d : pop rsp ; pop r13 ; pop r14 ; pop r15 ; ret

0x0000000000400690 : pop r14 ; pop r15 ; ret
0x0000000000400628 : mov qword ptr [r14], r15 ; ret

0x000000000040069) : pop rdi; ret


0x0000000000400510 : print_file@plt 
0x0000000000600df0 : addr of init array

we should write to .init_array .fini_array