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@copethomas

copethomas/mem_dump.sh

Last active Jun 14, 2020
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A small script to dump the memory of a process
#!/bin/bash
# Name: mem_dump.sh
# Description: A small script to dump the memory of a process
# Author: Thomas Cope
# ---
if [[ $# -ne 2 ]]
then
cat << EOF
./mem_dump.sh pid dryrun
PID = PID you want to dump
dryrun = "yes" to just print the GDB commands or "no" to run gdb to dump the memory
Example:
./mem_dump.sh 1234 no
EOF
exit 1
fi
crit() { echo "./mem_dump.sh : error : $1" && exit 2; }
command -v gdb > /dev/null 2>&1
[[ $? -ne 0 ]] && crit "GDB is required and was not found"
[[ -z $1 ]] && crit 'Please specify the PID of the process as $1'
[[ ! -d /proc/$1 ]] && crit "Pid $1 not found"
export dryrun=$2
dumpit() {
startAddr=$(echo "$2" | awk -F "-" '{print $1}')
endAddr=$(echo "$2" | awk -F "-" '{print $2}'|cut -d " " -f1)
dumpFile="/tmp/mem_dump_pid_$1_${startAddr}-${endAddr}.mem"
if [[ $dryrun == "yes" ]]
then
echo "dump memory $dumpFile 0x$startAddr 0x$endAddr"
else
gdb --batch -pid $1 -ex "dump memory $dumpFile 0x$startAddr 0x$endAddr" 2&>1 >/dev/null
if [ -f "$dumpFile" ]; then
echo "Memory dump pid:$1 data:${startAddr}-${endAddr} OK! Please see: $dumpFile"
else
crit "Failed to dump $1"
fi
fi
}
echo "Dumping Stack..."
dumpit "$1" "$(grep '\[stack\]' /proc/$1/maps)"
echo "Dumping Heap..."
dumpit "$1" "$(grep '\[heap\]' /proc/$1/maps)"
echo "Dumping Program..."
while read p; do
dumpit "$1" "$p"
done < <(grep $(readlink -f /proc/$1/exe) /proc/$1/maps)
echo Done
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