en Copyright 2015 Java http://172.16.0.5:8080/history/linux-6.15/tools/testing/selftests/x86/bugs/Makefile#7a9b709e selftest/x86/bugs: Add selftests for ITSBelow are the tests added for Indirect Target Selection (ITS):- its_sysfs.py - Check if sysfs reflects the correct mitigation status for the mitigation selected via the kernel cmdline.- its_permutations.py - tests mitigation selection with cmdline permutations with other bugs like spectre_v2 and retbleed.- its_indirect_alignment.py - verifies that for addresses in .retpoline_sites section that belong to lower half of cacheline are patched to ITS-safe thunk. Typical output looks like below: Site 49: function symbol: __x64_sys_restart_syscall+0x1f <0xffffffffbb1509af> # vmlinux: 0xffffffff813509af: jmp 0xffffffff81f5a8e0 # kcore: 0xffffffffbb1509af: jmpq *%rax # ITS thunk NOT expected for site 49 # PASSED: Found *%rax # Site 50: function symbol: __resched_curr+0xb0 <0xffffffffbb181910> # vmlinux: 0xffffffff81381910: jmp 0xffffffff81f5a8e0 # kcore: 0xffffffffbb181910: jmp 0xffffffffc02000fc # ITS thunk expected for site 50 # PASSED: Found 0xffffffffc02000fc -> jmpq *%rax <scattered-thunk?>- its_ret_alignment.py - verifies that for addresses in .return_sites section that belong to lower half of cacheline are patched to its_return_thunk. Typical output looks like below: Site 97: function symbol: collect_event+0x48 <0xffffffffbb007f18> # vmlinux: 0xffffffff81207f18: jmp 0xffffffff81f5b500 # kcore: 0xffffffffbb007f18: jmp 0xffffffffbbd5b560 # PASSED: Found jmp 0xffffffffbbd5b560 <its_return_thunk> # Site 98: function symbol: collect_event+0xa4 <0xffffffffbb007f74> # vmlinux: 0xffffffff81207f74: jmp 0xffffffff81f5b500 # kcore: 0xffffffffbb007f74: retq # PASSED: Found retqSome of these tests have dependency on tools like virtme-ng[1] and drgn[2].When the dependencies are not met, the test will be skipped.[1] https://github.com/arighi/virtme-ng[2] https://github.com/osandov/drgnCo-developed-by: Tao Zhang <tao1.zhang@linux.intel.com>Signed-off-by: Tao Zhang <tao1.zhang@linux.intel.com>Signed-off-by: Pawan Gupta <pawan.kumar.gupta@linux.intel.com>Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com> List of files: /linux-6.15/tools/testing/selftests/x86/bugs/Makefile Wed, 25 Dec 2024 00:09:28 +0000 Pawan Gupta <pawan.kumar.gupta@linux.intel.com>