linux-kernel - [PATCH 4.4 043/266] powerpc/64s: Enhance the information in cpu_show_spectre

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Date:   Wed, 15 May 2019 12:52:30 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Michal Suchanek <msuchanek@...e.de>,
        Michael Ellerman <mpe@...erman.id.au>
Subject: [PATCH 4.4 043/266] powerpc/64s: Enhance the information in cpu_show_spectre_v1()

From: Michal Suchanek <msuchanek@...e.de>

commit a377514519b9a20fa1ea9adddbb4129573129cef upstream.

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>
Signed-off-by: Michael Ellerman <mpe@...erman.id.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 arch/powerpc/kernel/security.c |    3 +++
 1 file changed, 3 insertions(+)

--- a/arch/powerpc/kernel/security.c
+++ b/arch/powerpc/kernel/security.c
@@ -121,6 +121,9 @@ ssize_t cpu_show_spectre_v1(struct devic
 	if (!security_ftr_enabled(SEC_FTR_BNDS_CHK_SPEC_BAR))
 		return sprintf(buf, "Not affected\n");
 
+	if (barrier_nospec_enabled)
+		return sprintf(buf, "Mitigation: __user pointer sanitization\n");
+
 	return sprintf(buf, "Vulnerable\n");
 }