linux-kernel - [PATCH 4.16 047/161] powerpc: Move default security feature flags

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Message-Id: <20180524093024.048578311@linuxfoundation.org>
Date:   Thu, 24 May 2018 11:37:52 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org, greg@...ah.com
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Mauricio Faria de Oliveira <mauricfo@...ux.vnet.ibm.com>,
        Michael Ellerman <mpe@...erman.id.au>
Subject: [PATCH 4.16 047/161] powerpc: Move default security feature flags

4.16-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Mauricio Faria de Oliveira <mauricfo@...ux.vnet.ibm.com>

commit e7347a86830f38dc3e40c8f7e28c04412b12a2e7 upstream.

This moves the definition of the default security feature flags
(i.e., enabled by default) closer to the security feature flags.

This can be used to restore current flags to the default flags.

Signed-off-by: Mauricio Faria de Oliveira <mauricfo@...ux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@...erman.id.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 arch/powerpc/include/asm/security_features.h |    8 ++++++++
 arch/powerpc/kernel/security.c               |    7 +------
 2 files changed, 9 insertions(+), 6 deletions(-)

--- a/arch/powerpc/include/asm/security_features.h
+++ b/arch/powerpc/include/asm/security_features.h
@@ -63,4 +63,12 @@ static inline bool security_ftr_enabled(
 // Firmware configuration indicates user favours security over performance
 #define SEC_FTR_FAVOUR_SECURITY		0x0000000000000200ull
 
+
+// Features enabled by default
+#define SEC_FTR_DEFAULT \
+	(SEC_FTR_L1D_FLUSH_HV | \
+	 SEC_FTR_L1D_FLUSH_PR | \
+	 SEC_FTR_BNDS_CHK_SPEC_BAR | \
+	 SEC_FTR_FAVOUR_SECURITY)
+
 #endif /* _ASM_POWERPC_SECURITY_FEATURES_H */
--- a/arch/powerpc/kernel/security.c
+++ b/arch/powerpc/kernel/security.c
@@ -11,12 +11,7 @@
 #include <asm/security_features.h>
 
 
-unsigned long powerpc_security_features __read_mostly = \
-	SEC_FTR_L1D_FLUSH_HV | \
-	SEC_FTR_L1D_FLUSH_PR | \
-	SEC_FTR_BNDS_CHK_SPEC_BAR | \
-	SEC_FTR_FAVOUR_SECURITY;
-
+unsigned long powerpc_security_features __read_mostly = SEC_FTR_DEFAULT;
 
 ssize_t cpu_show_meltdown(struct device *dev, struct device_attribute *attr, char *buf)
 {