[PATCH RESEND 5/6] arm64: add sysfs vulnerability show for speculative store bypass
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STALE2941d
From: Mian Yousaf Kaukab <hidden>
Date: 2018-08-27 14:33:53
Also in:
lkml
Subsystem:
arm64 port (aarch64 architecture), the rest · Maintainers:
Catalin Marinas, Will Deacon, Linus Torvalds
Revision resend of 2 in this series.
Revisions (2)
- v1 [diff vs current]
- resend current
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 <redacted> --- 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
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2.11.0