c - Invalid /bin/bash address while implementing return-to-libc -

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I'm trying to apply return-to-library explanation according to the tutorial. Everything seems to work properly, but I can not get the correct address of $ BINSH It seems that the variable is stored on 0xffffecbb, but GDB says it can not access the address. Where can the mistake be? The system's address () is 0x7ffff7a5a530 and exit () 0x7ffff7a50180 and both are accessible by gdb.


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