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commit94cd37ebb2Author: H.J. Lu <hjl.tools@gmail.com> 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 commit94cd37ebb2. 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 <carlos@redhat.com>
44 lines
1.3 KiB
C
44 lines
1.3 KiB
C
/* Check CPU_FEATURE_USABLE on IBT and SHSTK.
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Copyright (C) 2021 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <x86intrin.h>
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#include <sys/platform/x86.h>
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#include <support/test-driver.h>
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#include <support/xunistd.h>
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/* Check that CPU_FEATURE_USABLE on IBT and SHSTK matches _get_ssp. */
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static int
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do_test (void)
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{
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if (_get_ssp () != 0)
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{
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if (CPU_FEATURE_USABLE (IBT) && CPU_FEATURE_USABLE (SHSTK))
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return EXIT_SUCCESS;
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}
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else
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{
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if (!CPU_FEATURE_USABLE (IBT) && !CPU_FEATURE_USABLE (SHSTK))
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return EXIT_SUCCESS;
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}
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return EXIT_FAILURE;
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}
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#include <support/test-driver.c>
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