linux-kernel - [PATCH] powerpc/64s: Enhance the information in cpu_show_spectre

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Date:   Mon, 28 May 2018 15:19:14 +0200
From:   Michal Suchanek <msuchanek@...e.de>
To:     Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        Michal Suchanek <msuchanek@...e.de>,
        Mauricio Faria de Oliveira <mauricfo@...ux.vnet.ibm.com>,
        Nicholas Piggin <npiggin@...il.com>,
        Michael Neuling <mikey@...ling.org>,
        linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org
Subject: [PATCH] powerpc/64s: Enhance the information in cpu_show_spectre_v1()


We now have barrier_nospec as mitigation so print it in
cpu_show_spectre_v1 when enabled.

Signed-off-by: Michal Suchanek <msuchanek@...e.de>
---
 arch/powerpc/kernel/security.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/arch/powerpc/kernel/security.c b/arch/powerpc/kernel/security.c
index 0239383c7e4d..a0c32d53980b 100644
--- a/arch/powerpc/kernel/security.c
+++ b/arch/powerpc/kernel/security.c
@@ -120,7 +120,10 @@ ssize_t cpu_show_spectre_v1(struct device *dev, struct device_attribute *attr, c
 	if (!security_ftr_enabled(SEC_FTR_BNDS_CHK_SPEC_BAR))
 		return sprintf(buf, "Not affected\n");
 
-	return sprintf(buf, "Vulnerable\n");
+	if (barrier_nospec_enabled)
+		return sprintf(buf, "Mitigation: __user pointer sanitization\n");
+	else
+		return sprintf(buf, "Vulnerable\n");
 }
 
 ssize_t cpu_show_spectre_v2(struct device *dev, struct device_attribute *attr, char *buf)
-- 
2.13.6