4.9-stable review patch. If anyone has any objections, please let me know.
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From: Andi Kleen ak@linux.intel.com
commit 1ab534e85c93945f7862378d8c8adcf408205b19 upstream.
The check for Spectre microcodes does not check for family 6, only the model numbers.
Add a family 6 check to avoid ambiguity with other families.
Fixes: a5b296636453 ("x86/cpufeature: Blacklist SPEC_CTRL/PRED_CMD on early Spectre v2 microcodes") Signed-off-by: Andi Kleen ak@linux.intel.com Signed-off-by: Thomas Gleixner tglx@linutronix.de Cc: x86@kernel.org Cc: linux-kernel@vger.kernel.org Cc: stable@vger.kernel.org Link: https://lkml.kernel.org/r/20180824170351.34874-2-andi@firstfloor.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- arch/x86/kernel/cpu/intel.c | 3 +++ 1 file changed, 3 insertions(+)
--- a/arch/x86/kernel/cpu/intel.c +++ b/arch/x86/kernel/cpu/intel.c @@ -109,6 +109,9 @@ static bool bad_spectre_microcode(struct if (cpu_has(c, X86_FEATURE_HYPERVISOR)) return false;
+ if (c->x86 != 6) + return false; + for (i = 0; i < ARRAY_SIZE(spectre_bad_microcodes); i++) { if (c->x86_model == spectre_bad_microcodes[i].model && c->x86_stepping == spectre_bad_microcodes[i].stepping)