From 04dff6fc0d4ad44fc4491f89fed6574380b78251 Mon Sep 17 00:00:00 2001 From: "H.J. Lu" Date: Tue, 26 Jan 2021 20:48:45 -0800 Subject: x86: Properly set usable CET feature bits [BZ #26625] commit 94cd37ebb293321115a36a422b091fdb72d2fb08 Author: H.J. Lu Date: Wed Sep 16 05:27:32 2020 -0700 x86: Use HAS_CPU_FEATURE with IBT and SHSTK [BZ #26625] broke GLIBC_TUNABLES=glibc.cpu.hwcaps=-IBT,-SHSTK since it can no longer disable IBT nor SHSTK. Handle IBT and SHSTK with: 1. Revert commit 94cd37ebb293321115a36a422b091fdb72d2fb08. 2. Clears the usable CET feature bits if kernel doesn't support CET. 3. Add GLIBC_TUNABLES tests without dlopen. 4. Add tests to verify that CPU_FEATURE_USABLE on IBT and SHSTK matches _get_ssp. 5. Update GLIBC_TUNABLES tests with dlopen to verify that CET is disabled with GLIBC_TUNABLES. Reviewed-by: Carlos O'Donell --- sysdeps/x86/tst-get-cpu-features.c | 2 ++ 1 file changed, 2 insertions(+) (limited to 'sysdeps/x86/tst-get-cpu-features.c') diff --git a/sysdeps/x86/tst-get-cpu-features.c b/sysdeps/x86/tst-get-cpu-features.c index dcdb86bb93..b5e7f6e7b0 100644 --- a/sysdeps/x86/tst-get-cpu-features.c +++ b/sysdeps/x86/tst-get-cpu-features.c @@ -301,6 +301,7 @@ do_test (void) CHECK_CPU_FEATURE_USABLE (OSPKE); CHECK_CPU_FEATURE_USABLE (WAITPKG); CHECK_CPU_FEATURE_USABLE (AVX512_VBMI2); + CHECK_CPU_FEATURE_USABLE (SHSTK); CHECK_CPU_FEATURE_USABLE (GFNI); CHECK_CPU_FEATURE_USABLE (VAES); CHECK_CPU_FEATURE_USABLE (VPCLMULQDQ); @@ -324,6 +325,7 @@ do_test (void) CHECK_CPU_FEATURE_USABLE (HYBRID); CHECK_CPU_FEATURE_USABLE (TSXLDTRK); CHECK_CPU_FEATURE_USABLE (PCONFIG); + CHECK_CPU_FEATURE_USABLE (IBT); CHECK_CPU_FEATURE_USABLE (AMX_BF16); CHECK_CPU_FEATURE_USABLE (AVX512_FP16); CHECK_CPU_FEATURE_USABLE (AMX_TILE); -- cgit 1.4.1