[PATCH v3 2/7] arm64: add sysfs vulnerability show for spectre v1

From: Jeremy Linton
Date: Wed Jan 09 2019 - 18:56:19 EST


From: Mian Yousaf Kaukab <ykaukab@xxxxxxx>

spectre v1, has been mitigated, and the mitigation is
always active.

Signed-off-by: Mian Yousaf Kaukab <ykaukab@xxxxxxx>
Signed-off-by: Jeremy Linton <jeremy.linton@xxxxxxx>
---
arch/arm64/kernel/cpu_errata.c | 17 +++++++++++++++++
1 file changed, 17 insertions(+)

diff --git a/arch/arm64/kernel/cpu_errata.c b/arch/arm64/kernel/cpu_errata.c
index 09ac548c9d44..8dde8c616b7e 100644
--- a/arch/arm64/kernel/cpu_errata.c
+++ b/arch/arm64/kernel/cpu_errata.c
@@ -109,6 +109,8 @@ cpu_enable_trap_ctr_access(const struct arm64_cpu_capabilities *__unused)

atomic_t arm64_el2_vector_last_slot = ATOMIC_INIT(-1);

+uint arm64_requested_vuln_attrs = VULN_SPECTREV1;
+
#ifdef CONFIG_HARDEN_BRANCH_PREDICTOR
#include <asm/mmu_context.h>
#include <asm/cacheflush.h>
@@ -742,3 +744,18 @@ const struct arm64_cpu_capabilities arm64_errata[] = {
{
}
};
+
+#ifdef CONFIG_GENERIC_CPU_VULNERABILITIES
+
+uint arch_supported_vuln_attr_fields(void)
+{
+ return arm64_requested_vuln_attrs;
+}
+
+ssize_t cpu_show_spectre_v1(struct device *dev, struct device_attribute *attr,
+ char *buf)
+{
+ return sprintf(buf, "Mitigation: __user pointer sanitization\n");
+}
+
+#endif
--
2.17.2