| #!/usr/bin/env python3 |
| # SPDX-License-Identifier: GPL-2.0 |
| # |
| # Copyright (c) 2025 Intel Corporation |
| # |
| # Test for Indirect Target Selection(ITS) mitigation sysfs status. |
| |
| import sys, os, re |
| this_dir = os.path.dirname(os.path.realpath(__file__)) |
| sys.path.insert(0, this_dir + '/../../kselftest') |
| import ksft |
| |
| from common import * |
| |
| bug = "indirect_target_selection" |
| mitigation = get_sysfs(bug) |
| |
| ITS_MITIGATION_ALIGNED_THUNKS = "Mitigation: Aligned branch/return thunks" |
| ITS_MITIGATION_RETPOLINE_STUFF = "Mitigation: Retpolines, Stuffing RSB" |
| ITS_MITIGATION_VMEXIT_ONLY = "Mitigation: Vulnerable, KVM: Not affected" |
| ITS_MITIGATION_VULNERABLE = "Vulnerable" |
| |
| def check_mitigation(): |
| if mitigation == ITS_MITIGATION_ALIGNED_THUNKS: |
| if cmdline_has(f'{bug}=stuff') and sysfs_has("spectre_v2", "Retpolines"): |
| bug_check_fail(bug, ITS_MITIGATION_ALIGNED_THUNKS, ITS_MITIGATION_RETPOLINE_STUFF) |
| return |
| if cmdline_has(f'{bug}=vmexit') and cpuinfo_has('its_native_only'): |
| bug_check_fail(bug, ITS_MITIGATION_ALIGNED_THUNKS, ITS_MITIGATION_VMEXIT_ONLY) |
| return |
| bug_check_pass(bug, ITS_MITIGATION_ALIGNED_THUNKS) |
| return |
| |
| if mitigation == ITS_MITIGATION_RETPOLINE_STUFF: |
| if cmdline_has(f'{bug}=stuff') and sysfs_has("spectre_v2", "Retpolines"): |
| bug_check_pass(bug, ITS_MITIGATION_RETPOLINE_STUFF) |
| return |
| if sysfs_has('retbleed', 'Stuffing'): |
| bug_check_pass(bug, ITS_MITIGATION_RETPOLINE_STUFF) |
| return |
| bug_check_fail(bug, ITS_MITIGATION_RETPOLINE_STUFF, ITS_MITIGATION_ALIGNED_THUNKS) |
| |
| if mitigation == ITS_MITIGATION_VMEXIT_ONLY: |
| if cmdline_has(f'{bug}=vmexit') and cpuinfo_has('its_native_only'): |
| bug_check_pass(bug, ITS_MITIGATION_VMEXIT_ONLY) |
| return |
| bug_check_fail(bug, ITS_MITIGATION_VMEXIT_ONLY, ITS_MITIGATION_ALIGNED_THUNKS) |
| |
| if mitigation == ITS_MITIGATION_VULNERABLE: |
| if sysfs_has("spectre_v2", "Vulnerable"): |
| bug_check_pass(bug, ITS_MITIGATION_VULNERABLE) |
| else: |
| bug_check_fail(bug, "Mitigation", ITS_MITIGATION_VULNERABLE) |
| |
| bug_status_unknown(bug, mitigation) |
| return |
| |
| ksft.print_header() |
| ksft.set_plan(1) |
| ksft.print_msg(f'{bug}: {mitigation} ...') |
| |
| if not basic_checks_sufficient(bug, mitigation): |
| check_mitigation() |
| |
| ksft.finished() |
