BACKPORT: arm64: Add sysfs vulnerability show for spectre-v1

spectre-v1 has been mitigated and the mitigation is always active. Report this to userspace via sysfs This patch is backported from: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?h=v5.3-rc1&id=3891ebccace188af075ce143d8b072b65e90f695 Signed-off-by: Mian Yousaf Kaukab <[email protected]> Signed-off-by: Jeremy Linton <[email protected]> Reviewed-by: Andre Przywara <[email protected]> Reviewed-by: Catalin Marinas <[email protected]> Tested-by: Stefan Wahren <[email protected]> Acked-by: Suzuki K Poulose <[email protected]> Signed-off-by: Will Deacon <[email protected]> Signed-off-by: Khuong Dinh <[email protected]>
AmpereComputing · Apr 21, 2020 · be1dbd0 · be1dbd0
1 parent 7baed89
commit be1dbd0
Showing 1 changed file with 6 additions and 0 deletions.
diff --git a/arch/arm64/kernel/cpu_errata.c b/arch/arm64/kernel/cpu_errata.c
@@ -746,3 +746,9 @@ const struct arm64_cpu_capabilities arm64_errata[] = {
 	{
 	}
 };
+
+ssize_t cpu_show_spectre_v1(struct device *dev, struct device_attribute *attr,
+			    char *buf)
+{
+	return sprintf(buf, "Mitigation: __user pointer sanitization\n");
+}