1 files changed, 73 insertions, 0 deletions
diff --git a/packaging/check-kernel-config.sh b/packaging/check-kernel-config.sh
new file mode 100755
index 0000000..ded3225
--- /dev/null
+++ b/packaging/check-kernel-config.sh
@@ -0,0 +1,73 @@
+#!/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