36 lines
1.3 KiB
Diff
36 lines
1.3 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Andy Whitcroft <apw@canonical.com>
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Date: Wed, 20 Dec 2017 13:33:50 +0000
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Subject: [PATCH] UBUNTU: SAUCE: only attempt to use PCID in 64 bit builds
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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CVE-2017-5754
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[apw@canonical.com: need to review if this is still needed with the
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latest patches.]
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Signed-off-by: Andy Whitcroft <apw@canonical.com>
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Signed-off-by: Kleber Sacilotto de Souza <kleber.souza@canonical.com>
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(cherry picked from commit babace1d1ac19075498675cd787500cfa24d2b55)
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Signed-off-by: Fabian Grünbichler <f.gruenbichler@proxmox.com>
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---
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arch/x86/kernel/smpboot.c | 2 +-
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1 file changed, 1 insertion(+), 1 deletion(-)
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diff --git a/arch/x86/kernel/smpboot.c b/arch/x86/kernel/smpboot.c
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index 6ad8391b9866..398e8324fea4 100644
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--- a/arch/x86/kernel/smpboot.c
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+++ b/arch/x86/kernel/smpboot.c
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@@ -222,7 +222,7 @@ static void notrace start_secondary(void *unused)
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* before cpu_init(), SMP booting is too fragile that we want to
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* limit the things done here to the most necessary things.
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*/
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- if (boot_cpu_has(X86_FEATURE_PCID))
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+ if (IS_ENABLED(CONFIG_X86_64) && boot_cpu_has(X86_FEATURE_PCID))
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__write_cr4(__read_cr4() | X86_CR4_PCIDE);
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cpu_init();
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x86_cpuinit.early_percpu_clock_init();
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--
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2.14.2
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