Commit a802ed0d authored by Mimi Zohar's avatar Mimi Zohar

selftests/ima: kexec_load syscall test

The kernel CONFIG_KEXEC_VERIFY_SIG option is limited to verifying a
kernel image's signature, when loaded via the kexec_file_load syscall.
There is no method for verifying a kernel image's signature loaded
via the kexec_load syscall.

This test verifies loading the kernel image via the kexec_load syscall
fails when the kernel CONFIG_KEXEC_VERIFY_SIG option is enabled on
systems with secureboot enabled[1].

[1] Detecting secureboot enabled is architecture specific.
Signed-off-by: default avatarMimi Zohar <zohar@linux.ibm.com>
parent 060190fb
...@@ -13,6 +13,7 @@ TARGETS += firmware ...@@ -13,6 +13,7 @@ TARGETS += firmware
TARGETS += ftrace TARGETS += ftrace
TARGETS += futex TARGETS += futex
TARGETS += gpio TARGETS += gpio
TARGETS += ima
TARGETS += intel_pstate TARGETS += intel_pstate
TARGETS += ipc TARGETS += ipc
TARGETS += kcmp TARGETS += kcmp
......
# Makefile for kexec_load
uname_M := $(shell uname -m 2>/dev/null || echo not)
ARCH ?= $(shell echo $(uname_M) | sed -e s/i.86/x86/ -e s/x86_64/x86/)
ifeq ($(ARCH),x86)
TEST_PROGS := test_kexec_load.sh
include ../lib.mk
endif
CONFIG_IMA_APPRAISE
CONFIG_IMA_ARCH_POLICY
CONFIG_SECURITYFS
CONFIG_KEXEC_VERIFY_SIG
#!/bin/sh
# SPDX-License-Identifier: GPL-2.0+
# Loading a kernel image via the kexec_load syscall should fail
# when the kerne is CONFIG_KEXEC_VERIFY_SIG enabled and the system
# is booted in secureboot mode.
TEST="$0"
EFIVARFS="/sys/firmware/efi/efivars"
rc=0
# Kselftest framework requirement - SKIP code is 4.
ksft_skip=4
# kexec requires root privileges
if [ $UID != 0 ]; then
echo "$TEST: must be run as root" >&2
exit $ksft_skip
fi
# Make sure that efivars is mounted in the normal location
if ! grep -q "^\S\+ $EFIVARFS efivarfs" /proc/mounts; then
echo "$TEST: efivars is not mounted on $EFIVARFS" >&2
exit $ksft_skip
fi
# Get secureboot mode
file="$EFIVARFS/SecureBoot-*"
if [ ! -e $file ]; then
echo "$TEST: unknown secureboot mode" >&2
exit $ksft_skip
fi
secureboot=`hexdump $file | awk '{print substr($4,length($4),1)}'`
# kexec_load should fail in secure boot mode
KERNEL_IMAGE="/boot/vmlinuz-`uname -r`"
kexec -l $KERNEL_IMAGE &>> /dev/null
if [ $? == 0 ]; then
kexec -u
if [ "$secureboot" == "1" ]; then
echo "$TEST: kexec_load succeeded [FAIL]"
rc=1
else
echo "$TEST: kexec_load succeeded [PASS]"
fi
else
if [ "$secureboot" == "1" ]; then
echo "$TEST: kexec_load failed [PASS]"
else
echo "$TEST: kexec_load failed [FAIL]"
rc=1
fi
fi
exit $rc
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