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x86: Properly set usable CET feature bits [BZ #26625]

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commit 94cd37ebb2
Author: 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 commit 94cd37ebb2.
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>
This commit is contained in:
H.J. Lu
2021-01-26 20:48:45 -08:00
parent 6032ae6514
commit 04dff6fc0d
10 changed files with 120 additions and 13 deletions
Download Patch File Download Diff File Expand all files Collapse all files

2
sysdeps/x86/tst-get-cpu-features.c
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@@ -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);