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x86: Copy IBT and SHSTK usable only if CET is enabled

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IBT and SHSTK usable bits are copied from CPUID feature bits and later
cleared if kernel doesn't support CET.  Copy IBT and SHSTK usable only
if CET is enabled so that they aren't set on CET capable processors
with non-CET enabled glibc.
This commit is contained in:
H.J. Lu 2021-06-23 14:27:58 -07:00
parent a775a7a3eb
commit ea26ff0322
1 changed files with 5 additions and 2 deletions
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7
sysdeps/x86/cpu-features.c
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@ -76,7 +76,6 @@ update_usable (struct cpu_features *cpu_features)
CPU_FEATURE_SET_USABLE (cpu_features, PREFETCHWT1);
CPU_FEATURE_SET_USABLE (cpu_features, OSPKE);
CPU_FEATURE_SET_USABLE (cpu_features, WAITPKG);
CPU_FEATURE_SET_USABLE (cpu_features, SHSTK);
CPU_FEATURE_SET_USABLE (cpu_features, GFNI);
CPU_FEATURE_SET_USABLE (cpu_features, RDPID);
CPU_FEATURE_SET_USABLE (cpu_features, RDRAND);
@ -86,7 +85,6 @@ update_usable (struct cpu_features *cpu_features)
CPU_FEATURE_SET_USABLE (cpu_features, FSRM);
CPU_FEATURE_SET_USABLE (cpu_features, SERIALIZE);
CPU_FEATURE_SET_USABLE (cpu_features, TSXLDTRK);
CPU_FEATURE_SET_USABLE (cpu_features, IBT);
CPU_FEATURE_SET_USABLE (cpu_features, LAHF64_SAHF64);
CPU_FEATURE_SET_USABLE (cpu_features, LZCNT);
CPU_FEATURE_SET_USABLE (cpu_features, SSE4A);
@ -99,6 +97,11 @@ update_usable (struct cpu_features *cpu_features)
CPU_FEATURE_SET_USABLE (cpu_features, FSRCS);
CPU_FEATURE_SET_USABLE (cpu_features, PTWRITE);
#if CET_ENABLED
CPU_FEATURE_SET_USABLE (cpu_features, IBT);
CPU_FEATURE_SET_USABLE (cpu_features, SHSTK);
#endif
/* Can we call xgetbv? */
if (CPU_FEATURES_CPU_P (cpu_features, OSXSAVE))
{