linux-kernel - [PATCH 4.20 025/145] powerpc/fsl: Fix spectre

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Message-Id: <20190107104440.610290762@linuxfoundation.org>
Date:   Mon,  7 Jan 2019 13:31:02 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Diana Craciun <diana.craciun@....com>,
        Michael Ellerman <mpe@...erman.id.au>
Subject: [PATCH 4.20 025/145] powerpc/fsl: Fix spectre_v2 mitigations reporting

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

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

From: Diana Craciun <diana.craciun@....com>

commit 7d8bad99ba5a22892f0cad6881289fdc3875a930 upstream.

Currently for CONFIG_PPC_FSL_BOOK3E the spectre_v2 file is incorrect:

  $ cat /sys/devices/system/cpu/vulnerabilities/spectre_v2
  "Mitigation: Software count cache flush"

Which is wrong. Fix it to report vulnerable for now.

Fixes: ee13cb249fab ("powerpc/64s: Add support for software count cache flush")
Cc: stable@...r.kernel.org # v4.19+
Signed-off-by: Diana Craciun <diana.craciun@....com>
Signed-off-by: Michael Ellerman <mpe@...erman.id.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 arch/powerpc/kernel/security.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/arch/powerpc/kernel/security.c
+++ b/arch/powerpc/kernel/security.c
@@ -22,7 +22,7 @@ enum count_cache_flush_type {
 	COUNT_CACHE_FLUSH_SW	= 0x2,
 	COUNT_CACHE_FLUSH_HW	= 0x4,
 };
-static enum count_cache_flush_type count_cache_flush_type;
+static enum count_cache_flush_type count_cache_flush_type = COUNT_CACHE_FLUSH_NONE;
 
 bool barrier_nospec_enabled;
 static bool no_nospec;