linux-kernel - [PATCH 4.5 056/200] s390/pci: add extra padding to function measurement block

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Message-Id: <20160503000556.434926091@linuxfoundation.org>
Date:	Mon,  2 May 2016 17:10:55 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Sebastian Ott <sebott@...ux.vnet.ibm.com>,
	Martin Schwidefsky <schwidefsky@...ibm.com>
Subject: [PATCH 4.5 056/200] s390/pci: add extra padding to function measurement block

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

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

From: Sebastian Ott <sebott@...ux.vnet.ibm.com>

commit 9d89d9e61d361f3adb75e1aebe4bb367faf16cfa upstream.

Newer machines might use a different (larger) format for function
measurement blocks. To ensure that we comply with the alignment
requirement on these machines and prevent memory corruption (when
firmware writes more data than we expect) add 16 padding bytes
at the end of the fmb.

Signed-off-by: Sebastian Ott <sebott@...ux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@...ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 arch/s390/include/asm/pci.h |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/arch/s390/include/asm/pci.h
+++ b/arch/s390/include/asm/pci.h
@@ -45,7 +45,8 @@ struct zpci_fmb {
 	u64 rpcit_ops;
 	u64 dma_rbytes;
 	u64 dma_wbytes;
-} __packed __aligned(64);
+	u64 pad[2];
+} __packed __aligned(128);
 
 enum zpci_state {
 	ZPCI_FN_STATE_RESERVED,