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- #!/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()
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