tools/testing/selftests/bpf/ima_setup.sh

Source file repositories/reference/linux-study-clean/tools/testing/selftests/bpf/ima_setup.sh

File Facts

System
Linux kernel
Corpus path
tools/testing/selftests/bpf/ima_setup.sh
Extension
.sh
Size
3339 bytes
Lines
157
Domain
Support Tooling And Documentation
Bucket
tools
Inferred role
Support Tooling And Documentation: tools
Status
atlas-only

Why This File Exists

Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.

Dependency Surface

Detected Declarations

Annotated Snippet

#!/bin/bash
# SPDX-License-Identifier: GPL-2.0

set -e
set -u
set -o pipefail

IMA_POLICY_FILE="/sys/kernel/security/ima/policy"
TEST_BINARY="/bin/true"
VERBOSE="${SELFTESTS_VERBOSE:=0}"
LOG_FILE="$(mktemp /tmp/ima_setup.XXXX.log)"

usage()
{
	echo "Usage: $0 <setup|cleanup|run|modify-bin|restore-bin|load-policy> <existing_tmp_dir>"
	exit 1
}

ensure_mount_securityfs()
{
	local securityfs_dir=$(grep "securityfs" /proc/mounts | awk '{print $2}')

	if [ -z "${securityfs_dir}" ]; then
		securityfs_dir=/sys/kernel/security
		mount -t securityfs security "${securityfs_dir}"
	fi

	if [ ! -d "${securityfs_dir}" ]; then
		echo "${securityfs_dir}: securityfs is not mounted" && exit 1
	fi
}

setup()
{
	local tmp_dir="$1"
	local mount_img="${tmp_dir}/test.img"
	local mount_dir="${tmp_dir}/mnt"
	local copied_bin_path="${mount_dir}/$(basename ${TEST_BINARY})"
	mkdir -p ${mount_dir}

	dd if=/dev/zero of="${mount_img}" bs=1M count=10

	losetup -f "${mount_img}"
	local loop_device=$(losetup -a | grep ${mount_img:?} | cut -d ":" -f1)

	mkfs.ext2 "${loop_device:?}"
	mount "${loop_device}" "${mount_dir}"

	cp "${TEST_BINARY}" "${mount_dir}"
	local mount_uuid="$(blkid ${loop_device} | sed 's/.*UUID="\([^"]*\)".*/\1/')"

	ensure_mount_securityfs
	echo "measure func=BPRM_CHECK fsuuid=${mount_uuid}" > ${IMA_POLICY_FILE}
	echo "measure func=BPRM_CHECK fsuuid=${mount_uuid}" > ${mount_dir}/policy_test
}

cleanup() {
	local tmp_dir="$1"
	local mount_img="${tmp_dir}/test.img"
	local mount_dir="${tmp_dir}/mnt"

	local loop_devices=$(losetup -a | grep ${mount_img:?} | cut -d ":" -f1)

	for loop_dev in "${loop_devices}"; do
		losetup -d $loop_dev
	done

	umount ${mount_dir}
	rm -rf ${tmp_dir}
}

Annotation

Implementation Notes