name : kexec_common_lib.sh #!/bin/sh # SPDX-License-Identifier: GPL-2.0 # # Kselftest framework defines: ksft_pass=0, ksft_fail=1, ksft_skip=4 VERBOSE="${VERBOSE:-1}" IKCONFIG="/tmp/config-`uname -r`" KERNEL_IMAGE="/boot/vmlinuz-`uname -r`" SECURITYFS=$(grep "securityfs" /proc/mounts | awk '{print $2}') log_info() { [ $VERBOSE -ne 0 ] && echo "[INFO] $1" } # The ksefltest framework requirement returns 0 for PASS. log_pass() { [ $VERBOSE -ne 0 ] && echo "$1 [PASS]" exit 0 } # The ksefltest framework requirement returns 1 for FAIL. log_fail() { [ $VERBOSE -ne 0 ] && echo "$1 [FAIL]" exit 1 } # The ksefltest framework requirement returns 4 for SKIP. log_skip() { [ $VERBOSE -ne 0 ] && echo "$1" exit 4 } # Check efivar SecureBoot-$(the UUID) and SetupMode-$(the UUID). # (Based on kdump-lib.sh) get_efivarfs_secureboot_mode() { local efivarfs="/sys/firmware/efi/efivars" local secure_boot_file="" local setup_mode_file="" local secureboot_mode=0 local setup_mode=0 # Make sure that efivar_fs is mounted in the normal location if ! grep -q "^\S\+ $efivarfs efivarfs" /proc/mounts; then log_info "efivars is not mounted on $efivarfs" return 0; fi secure_boot_file=$(find "$efivarfs" -name SecureBoot-* 2>/dev/null) setup_mode_file=$(find "$efivarfs" -name SetupMode-* 2>/dev/null) if [ -f "$secure_boot_file" ] && [ -f "$setup_mode_file" ]; then secureboot_mode=$(hexdump -v -e '/1 "%d\ "' \ "$secure_boot_file"|cut -d' ' -f 5) setup_mode=$(hexdump -v -e '/1 "%d\ "' \ "$setup_mode_file"|cut -d' ' -f 5) if [ $secureboot_mode -eq 1 ] && [ $setup_mode -eq 0 ]; then log_info "secure boot mode enabled (CONFIG_EFIVAR_FS)" return 1; fi fi return 0; } # On powerpc platform, check device-tree property # /proc/device-tree/ibm,secureboot/os-secureboot-enforcing # to detect secureboot state. get_ppc64_secureboot_mode() { local secure_boot_file="/proc/device-tree/ibm,secureboot/os-secureboot-enforcing" # Check for secure boot file existence if [ -f $secure_boot_file ]; then log_info "Secureboot is enabled (Device tree)" return 1; fi log_info "Secureboot is not enabled (Device tree)" return 0; } # Return the architecture of the system get_arch() { echo $(arch) } # Check efivar SecureBoot-$(the UUID) and SetupMode-$(the UUID). # The secure boot mode can be accessed as the last integer of # "od -An -t u1 /sys/firmware/efi/efivars/SecureBoot-*". The efi # SetupMode can be similarly accessed. # Return 1 for SecureBoot mode enabled and SetupMode mode disabled. get_secureboot_mode() { local secureboot_mode=0 local system_arch=$(get_arch) if [ "$system_arch" == "ppc64le" ]; then get_ppc64_secureboot_mode secureboot_mode=$? else get_efivarfs_secureboot_mode secureboot_mode=$? fi if [ $secureboot_mode -eq 0 ]; then log_info "secure boot mode not enabled" fi return $secureboot_mode; } require_root_privileges() { if [ $(id -ru) -ne 0 ]; then log_skip "requires root privileges" fi } # Look for config option in Kconfig file. # Return 1 for found and 0 for not found. kconfig_enabled() { local config="$1" local msg="$2" grep -E -q $config $IKCONFIG if [ $? -eq 0 ]; then log_info "$msg" return 1 fi return 0 } # Attempt to get the kernel config first by checking the modules directory # then via proc, and finally by extracting it from the kernel image or the # configs.ko using scripts/extract-ikconfig. # Return 1 for found. get_kconfig() { local proc_config="/proc/config.gz" local module_dir="/lib/modules/`uname -r`" local configs_module="$module_dir/kernel/kernel/configs.ko*" if [ -f $module_dir/config ]; then IKCONFIG=$module_dir/config return 1 fi if [ ! -f $proc_config ]; then modprobe configs > /dev/null 2>&1 fi if [ -f $proc_config ]; then cat $proc_config | gunzip > $IKCONFIG 2>/dev/null if [ $? -eq 0 ]; then return 1 fi fi local extract_ikconfig="$module_dir/source/scripts/extract-ikconfig" if [ ! -f $extract_ikconfig ]; then log_skip "extract-ikconfig not found" fi $extract_ikconfig $KERNEL_IMAGE > $IKCONFIG 2>/dev/null if [ $? -eq 1 ]; then if [ ! -f $configs_module ]; then log_skip "CONFIG_IKCONFIG not enabled" fi $extract_ikconfig $configs_module > $IKCONFIG if [ $? -eq 1 ]; then log_skip "CONFIG_IKCONFIG not enabled" fi fi return 1 } # Make sure that securityfs is mounted mount_securityfs() { if [ -z $SECURITYFS ]; then SECURITYFS=/sys/kernel/security mount -t securityfs security $SECURITYFS fi if [ ! -d "$SECURITYFS" ]; then log_fail "$SECURITYFS :securityfs is not mounted" fi } # The policy rule format is an "action" followed by key-value pairs. This # function supports up to two key-value pairs, in any order. # For example: action func=<keyword> [appraise_type=<type>] # Return 1 for found and 0 for not found. check_ima_policy() { local action="$1" local keypair1="$2" local keypair2="$3" local ret=0 mount_securityfs local ima_policy=$SECURITYFS/ima/policy if [ ! -e $ima_policy ]; then log_fail "$ima_policy not found" fi if [ -n $keypair2 ]; then grep -e "^$action.*$keypair1" "$ima_policy" | \ grep -q -e "$keypair2" else grep -q -e "^$action.*$keypair1" "$ima_policy" fi # invert "grep -q" result, returning 1 for found. [ $? -eq 0 ] && ret=1 return $ret }