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commit 94cd37ebb293321115a36a422b091fdb72d2fb08
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Author: H.J. Lu <hjl.tools@gmail.com>
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Date: Wed Sep 16 05:27:32 2020 -0700
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x86: Use HAS_CPU_FEATURE with IBT and SHSTK [BZ #26625]
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commit 04bba1e5d84b6fd8d3a3b006bc240cd5d241ee30
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Author: H.J. Lu <hjl.tools@gmail.com>
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Date: Wed Aug 5 13:51:56 2020 -0700
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x86: Set CPU usable feature bits conservatively [BZ #26552]
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Set CPU usable feature bits only for CPU features which are usable in
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user space and whose usability can be detected from user space, excluding
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features like FSGSBASE whose enable bit can only be checked in the kernel.
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no longer turns on the usable bits of IBT and SHSTK since we don't know
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if IBT and SHSTK are usable until much later. Use HAS_CPU_FEATURE to
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check if the processor supports IBT and SHSTK.
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diff --git a/sysdeps/x86/cpu-features.c b/sysdeps/x86/cpu-features.c
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index 77a596a15404b575..7f2ff00f2b4b45f2 100644
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--- a/sysdeps/x86/cpu-features.c
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+++ b/sysdeps/x86/cpu-features.c
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@@ -722,9 +722,9 @@ no_cpuid:
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GLIBC_TUNABLES=glibc.cpu.hwcaps=-IBT,-SHSTK
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*/
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unsigned int cet_feature = 0;
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- if (!CPU_FEATURE_USABLE (IBT))
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+ if (!HAS_CPU_FEATURE (IBT))
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cet_feature |= GNU_PROPERTY_X86_FEATURE_1_IBT;
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- if (!CPU_FEATURE_USABLE (SHSTK))
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+ if (!HAS_CPU_FEATURE (SHSTK))
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cet_feature |= GNU_PROPERTY_X86_FEATURE_1_SHSTK;
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if (cet_feature)
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diff --git a/sysdeps/x86/dl-cet.c b/sysdeps/x86/dl-cet.c
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index 11ff0618fae7230f..d481bddc27e5d7cc 100644
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--- a/sysdeps/x86/dl-cet.c
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+++ b/sysdeps/x86/dl-cet.c
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@@ -74,10 +74,10 @@ dl_cet_check (struct link_map *m, const char *program)
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GLIBC_TUNABLES=glibc.cpu.hwcaps=-IBT,-SHSTK
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*/
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- enable_ibt &= (CPU_FEATURE_USABLE (IBT)
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+ enable_ibt &= (HAS_CPU_FEATURE (IBT)
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&& (enable_ibt_type == cet_always_on
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|| (m->l_cet & lc_ibt) != 0));
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- enable_shstk &= (CPU_FEATURE_USABLE (SHSTK)
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+ enable_shstk &= (HAS_CPU_FEATURE (SHSTK)
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&& (enable_shstk_type == cet_always_on
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|| (m->l_cet & lc_shstk) != 0));
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}
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diff --git a/sysdeps/x86/tst-get-cpu-features.c b/sysdeps/x86/tst-get-cpu-features.c
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index c01d701b52090983..3ec94e0c9a191f36 100644
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--- a/sysdeps/x86/tst-get-cpu-features.c
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+++ b/sysdeps/x86/tst-get-cpu-features.c
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@@ -318,7 +318,6 @@ do_test (void)
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CHECK_CPU_FEATURE_USABLE (OSPKE);
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CHECK_CPU_FEATURE_USABLE (WAITPKG);
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CHECK_CPU_FEATURE_USABLE (AVX512_VBMI2);
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- CHECK_CPU_FEATURE_USABLE (SHSTK);
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CHECK_CPU_FEATURE_USABLE (GFNI);
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CHECK_CPU_FEATURE_USABLE (VAES);
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CHECK_CPU_FEATURE_USABLE (VPCLMULQDQ);
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@@ -342,7 +341,6 @@ do_test (void)
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CHECK_CPU_FEATURE_USABLE (HYBRID);
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CHECK_CPU_FEATURE_USABLE (TSXLDTRK);
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CHECK_CPU_FEATURE_USABLE (PCONFIG);
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- CHECK_CPU_FEATURE_USABLE (IBT);
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CHECK_CPU_FEATURE_USABLE (AMX_BF16);
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CHECK_CPU_FEATURE_USABLE (AMX_TILE);
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CHECK_CPU_FEATURE_USABLE (AMX_INT8);
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