checksec and /proc/<pid>/maps

$ checksec --file=./vuln
RELRO   STACK CANARY   NX      PIE
Partial   No canary    NX enabled   No PIE

$ cat /proc/$(pidof vuln)/maps
555555554000-555555555000 r-xp  ...  /home/ctf/vuln   # .text
7ffff7dc0000-7ffff7fb0000 r-xp  ...  libc.so.6        # libc code
7ffffffde000-7ffffffff000 rw-p  ...  [stack]          # the stack

• checksec reports which mitigations are on: NX, stack canary, PIE, RELRO — this dictates your attack strategy.
• /proc/<pid>/maps shows the live memory map with real addresses and permissions.