gdb-ext4-module.sh

#!/usr/bin/env bash

set -x

target=$1

for i in /usr/src/linux/fs/ext4/ext4.ko /usr/src/linux/vmlinux; do
    scp -P2204 root@localhost:$i ./
done

parametersInstalled=0
function printVmCommands()
{
    echo "=== Run next commands on the vm: ==="
    if [ $parametersInstalled -eq 0 ]; then
        echo "echo kdb,ttyS0,115200 >| /sys/module/kgdboc/parameters/kgdboc"
        parametersInstalled=1
    fi
    echo "echo g >| /proc/sysrq-trigger # sometimes multiple times"
}

echo "Obtaining ext4 module address ..."
printVmCommands
ext4_load_addr=$(gdb -q vmlinux \
                     -ex "target remote $target" \
                     -ex "monitor lsmod" \
                     -ex "quit" 2>&1 | \
                 fgrep ext4 | awk '{print $6}')
echo "ext4 address is: ${ext4_load_addr}"

printVmCommands
gdb vmlinux \
    -ex "target remote $target" \
    -ex "add-symbol-file ext4.ko ${ext4_load_addr}"