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#!/usr/bin/env bash
get_kernel_version() {
r="$(uname -r | cut -f 1 -d '-')"
read -r -a p <<< "$(echo "${r}" | tr '.' ' ')"
printf "%03d%03d%03d" "${p[0]}" "${p[1]}" "${p[2]}"
}
get_rh_version() {
if [ ! -f /etc/redhat-release ]; then
printf "000000000"
return
fi
r="$(cut -f 4 -d ' ' < /etc/redhat-release)"
read -r -a p <<< "$(echo "${r}" | tr '.' ' ')"
printf "%03d%03d%03d" "${p[0]}" "${p[1]}" "${p[2]}"
}
if [ "$(uname -s)" != "Linux" ]; then
echo >&2 "This does not appear to be a Linux system."
exit 1
fi
KERNEL_VERSION="$(uname -r)"
if [ "$(get_kernel_version)" -lt 004014000 ] && [ "$(get_rh_version)" -lt 0070061810 ]; then
echo >&2 "WARNING: Your kernel appears to be older than 4.11 or you are using RH version older than 7.6.1810. This may still work in some cases, but probably won't."
fi
CONFIG_PATH=""
MODULE_LOADED=""
if modprobe configs 2> /dev/null; then
MODULE_LOADED=1
fi
if [ -r /proc/config.gz ]; then
CONFIG_PATH="/proc/config.gz"
elif [ -r "/lib/modules/${KERNEL_VERSION}/source/.config" ]; then
CONFIG_PATH="/lib/modules/${KERNEL_VERSION}/source/.config"
elif [ -r "/lib/modules/${KERNEL_VERSION}.x86_64/source/.config" ]; then
CONFIG_PATH="/lib/modules/${KERNEL_VERSION}.x86_64/source/.config"
elif [ -n "$(find /boot -name "config-${KERNEL_VERSION}*")" ]; then
CONFIG_PATH="$(find /boot -name "config-${KERNEL_VERSION}*" | head -n 1)"
fi
if [ -n "${CONFIG_PATH}" ]; then
GREP='grep'
if echo "${CONFIG_PATH}" | grep -q '.gz'; then
GREP='zgrep'
fi
REQUIRED_CONFIG="KPROBES KPROBES_ON_FTRACE HAVE_KPROBES BPF BPF_SYSCALL BPF_JIT"
for required_config in ${REQUIRED_CONFIG}; do
if ! "${GREP}" -q "CONFIG_${required_config}=y" "${CONFIG_PATH}"; then
echo >&2 " Missing Kernel Config: ${required_config}"
exit 1
fi
done
fi
if [ -n "${MODULE_LOADED}" ]; then
modprobe -r configs 2> /dev/null || true # Ignore failures from CONFIGS being builtin
fi
exit 0
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