From mboxrd@z Thu Jan 1 00:00:00 1970 From: ykaukab@suse.de (Mian Yousaf Kaukab) Date: Tue, 7 Aug 2018 20:14:18 +0200 Subject: [PATCH 5/6] arm64: add sysfs vulnerability show for speculative store bypass In-Reply-To: <20180807181419.15690-1-ykaukab@suse.de> References: <20180807181419.15690-1-ykaukab@suse.de> Message-ID: <20180807181419.15690-6-ykaukab@suse.de> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org Return status based no ssbd_state. Return string "Unknown" in case CONFIG_ARM64_SSBD is disabled or arch workaround2 is not available in the firmware. Signed-off-by: Mian Yousaf Kaukab --- arch/arm64/kernel/cpu_errata.c | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+) diff --git a/arch/arm64/kernel/cpu_errata.c b/arch/arm64/kernel/cpu_errata.c index 8469d3be7b15..8b60aa30a3fa 100644 --- a/arch/arm64/kernel/cpu_errata.c +++ b/arch/arm64/kernel/cpu_errata.c @@ -744,4 +744,24 @@ ssize_t cpu_show_spectre_v2(struct device *dev, struct device_attribute *attr, return sprintf(buf, "Not affected\n"); } +ssize_t cpu_show_spec_store_bypass(struct device *dev, + struct device_attribute *attr, char *buf) +{ + switch (arm64_get_ssbd_state()) { + case ARM64_SSBD_MITIGATED: + return sprintf(buf, "Not affected\n"); + + case ARM64_SSBD_KERNEL: + case ARM64_SSBD_FORCE_ENABLE: + return sprintf(buf, + "Mitigation: Speculative Store Bypass disabled"); + + case ARM64_SSBD_FORCE_DISABLE: + return sprintf(buf, "Vulnerable\n"); + + default: /* ARM64_SSBD_UNKNOWN*/ + return sprintf(buf, "Unknown\n"); + } +} + #endif -- 2.11.0