Patch "powerpc: Move default security feature flags" has been added to the 4.16-stable tree

[gregkh at linuxfoundation.org]

This is a note to let you know that I've just added the patch titled

    powerpc: Move default security feature flags

to the 4.16-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     powerpc-move-default-security-feature-flags.patch
and it can be found in the queue-4.16 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable at vger.kernel.org> know about it.


>From foo at baz Wed May 23 19:18:22 CEST 2018
From: Michael Ellerman <mpe at ellerman.id.au>
Date: Wed, 23 May 2018 00:41:24 +1000
Subject: powerpc: Move default security feature flags
To: greg at kroah.com
Cc: stable at vger.kernel.org, tglx at linutronix.de, linuxppc-dev at ozlabs.org
Message-ID: <20180522144125.10345-14-mpe at ellerman.id.au>

From: Mauricio Faria de Oliveira <mauricfo at linux.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 at linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe at ellerman.id.au>
Signed-off-by: Greg Kroah-Hartman <gregkh at linuxfoundation.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)
 {


Patches currently in stable-queue which might be from mpe at ellerman.id.au are

queue-4.16/powerpc-pseries-fix-clearing-of-security-feature-flags.patch
queue-4.16/powerpc-powernv-set-or-clear-security-feature-flags.patch
queue-4.16/powerpc-64s-move-cpu_show_meltdown.patch
queue-4.16/powerpc-pseries-set-or-clear-security-feature-flags.patch
queue-4.16/powerpc-move-default-security-feature-flags.patch
queue-4.16/powerpc-powernv-use-the-security-flags-in-pnv_setup_rfi_flush.patch
queue-4.16/powerpc-add-security-feature-flags-for-spectre-meltdown.patch
queue-4.16/powerpc-pseries-use-the-security-flags-in-pseries_setup_rfi_flush.patch
queue-4.16/powerpc-64s-enhance-the-information-in-cpu_show_meltdown.patch
queue-4.16/powerpc-rfi-flush-always-enable-fallback-flush-on-pseries.patch
queue-4.16/powerpc-pseries-add-new-h_get_cpu_characteristics-flags.patch
queue-4.16/powerpc-64s-add-support-for-a-store-forwarding-barrier-at-kernel-entry-exit.patch
queue-4.16/powerpc-64s-wire-up-cpu_show_spectre_v1.patch
queue-4.16/powerpc-64s-wire-up-cpu_show_spectre_v2.patch