From d40e8e726e67ba518869ffd6adec4fae7c0bb35c Mon Sep 17 00:00:00 2001 From: Andy Whitcroft Date: Tue, 30 Jan 2018 14:46:27 +0000 Subject: [PATCH 101/131] UBUNTU: SAUCE: claim mitigation via observable speculation barrier CVE-2017-5753 (Spectre v1 Intel) Signed-off-by: Andy Whitcroft --- arch/x86/kernel/cpu/bugs.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/arch/x86/kernel/cpu/bugs.c b/arch/x86/kernel/cpu/bugs.c index ba5122a3edf5..a896651724d1 100644 --- a/arch/x86/kernel/cpu/bugs.c +++ b/arch/x86/kernel/cpu/bugs.c @@ -278,11 +278,19 @@ ssize_t cpu_show_meltdown(struct device *dev, return sprintf(buf, "Vulnerable\n"); } +#ifndef osb +#define osb_is_enabled (0) +#endif +#ifndef osb_is_enabled +#define osb_is_enabled (1) +#endif ssize_t cpu_show_spectre_v1(struct device *dev, struct device_attribute *attr, char *buf) { if (!boot_cpu_has_bug(X86_BUG_SPECTRE_V1)) return sprintf(buf, "Not affected\n"); + if (osb_is_enabled) + return sprintf(buf, "Mitigation: OSB (observable speculation barrier, Intel v6)\n"); return sprintf(buf, "Vulnerable\n"); } -- 2.15.1