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gdb-peda$ c
Continuing.

buf[32] address : 0x7fffffffe400
Printf() address : 0x7ffff785e800
AAAAAAAABBBBBBBBCCCCCCCCDDDDDDDDEEEEEEEEFFFFFFFFGG

Breakpoint 2, 0x0000000000400766 in vuln ()
gdb-peda$ G
Ambiguous command "G": .
gdb-peda$ i r rbp
rbp            0x7fffffffe430	0x7fffffffe430
gdb-peda$ x/2gx 0x7fffffffe430
0x7fffffffe430:	0x00007fffffffe447	0x000000000040079b
gdb-peda$ ni

0x0000000000400767 in vuln ()
gdb-peda$ i r rbp
rbp            0x7fffffffe447	0x7fffffffe447
gdb-peda$