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59d5af67 | 1 | From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001 |
321d628a FG |
2 | From: Andy Whitcroft <apw@canonical.com> |
3 | Date: Wed, 20 Dec 2017 13:33:50 +0000 | |
59d5af67 | 4 | Subject: [PATCH] UBUNTU: SAUCE: only attempt to use PCID in 64 bit builds |
321d628a FG |
5 | MIME-Version: 1.0 |
6 | Content-Type: text/plain; charset=UTF-8 | |
7 | Content-Transfer-Encoding: 8bit | |
8 | ||
9 | CVE-2017-5754 | |
10 | ||
11 | [apw@canonical.com: need to review if this is still needed with the | |
12 | latest patches.] | |
13 | Signed-off-by: Andy Whitcroft <apw@canonical.com> | |
14 | Signed-off-by: Kleber Sacilotto de Souza <kleber.souza@canonical.com> | |
15 | (cherry picked from commit babace1d1ac19075498675cd787500cfa24d2b55) | |
16 | Signed-off-by: Fabian Grünbichler <f.gruenbichler@proxmox.com> | |
17 | --- | |
18 | arch/x86/kernel/smpboot.c | 2 +- | |
19 | 1 file changed, 1 insertion(+), 1 deletion(-) | |
20 | ||
21 | diff --git a/arch/x86/kernel/smpboot.c b/arch/x86/kernel/smpboot.c | |
22 | index 6ad8391b9866..398e8324fea4 100644 | |
23 | --- a/arch/x86/kernel/smpboot.c | |
24 | +++ b/arch/x86/kernel/smpboot.c | |
25 | @@ -222,7 +222,7 @@ static void notrace start_secondary(void *unused) | |
26 | * before cpu_init(), SMP booting is too fragile that we want to | |
27 | * limit the things done here to the most necessary things. | |
28 | */ | |
29 | - if (boot_cpu_has(X86_FEATURE_PCID)) | |
30 | + if (IS_ENABLED(CONFIG_X86_64) && boot_cpu_has(X86_FEATURE_PCID)) | |
31 | __write_cr4(__read_cr4() | X86_CR4_PCIDE); | |
32 | cpu_init(); | |
33 | x86_cpuinit.early_percpu_clock_init(); | |
34 | -- | |
35 | 2.14.2 | |
36 |