diff mbox series

[RFC,9/10] powerpc/64s: Wire up cpu_show_spectre_v1()

Message ID 20180302115846.12240-3-mpe@ellerman.id.au (mailing list archive)
State Superseded
Headers show
Series [RFC,1/6] powerpc: Add security feature flags for Spectre/Meltdown | expand

Commit Message

Michael Ellerman March 2, 2018, 11:58 a.m. UTC 
Add a definition for cpu_show_spectre_v1() to override the generic
version. Currently this just prints "Not affected" or "Vulnerable"
based on the firmware flag.

Although the kernel does have array_index_nospec() in a few places, we
haven't yet audited all the powerpc code to see where it's necessary,
so for now we don't list that as a mitigation.

Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
---
 arch/powerpc/kernel/security.c | 8 ++++++++
 1 file changed, 8 insertions(+)
diff mbox series

Patch

diff --git a/arch/powerpc/kernel/security.c b/arch/powerpc/kernel/security.c
index 865db6f8bcca..0eace3cac818 100644
--- a/arch/powerpc/kernel/security.c
+++ b/arch/powerpc/kernel/security.c
@@ -50,3 +50,11 @@  ssize_t cpu_show_meltdown(struct device *dev, struct device_attribute *attr, cha
 
 	return sprintf(buf, "Vulnerable\n");
 }
+
+ssize_t cpu_show_spectre_v1(struct device *dev, struct device_attribute *attr, char *buf)
+{
+	if (!security_ftr_enabled(SEC_FTR_BNDS_CHK_SPEC_BAR))
+		return sprintf(buf, "Not affected\n");
+
+	return sprintf(buf, "Vulnerable\n");
+}