linux-kernel - [PATCH 3.4 095/125] xen-blkback: only read request operation from shared ring once

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Message-Id: <1476275641-4697-95-git-send-email-lizf@kernel.org>
Date:   Wed, 12 Oct 2016 20:33:31 +0800
From:   lizf@...nel.org
To:     stable@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org,
        Roger Pau Monné <roger.pau@...rix.com>,
        David Vrabel <david.vrabel@...rix.com>,
        Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
        Zefan Li <lizefan@...wei.com>
Subject: [PATCH 3.4 095/125] xen-blkback: only read request operation from shared ring once

From: Roger Pau Monné <roger.pau@...rix.com>

3.4.113-rc1 review patch.  If anyone has any objections, please let me know.

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


commit 1f13d75ccb806260079e0679d55d9253e370ec8a upstream.

A compiler may load a switch statement value multiple times, which could
be bad when the value is in memory shared with the frontend.

When converting a non-native request to a native one, ensure that
src->operation is only loaded once by using READ_ONCE().

This is part of XSA155.

Signed-off-by: Roger Pau Monné <roger.pau@...rix.com>
Signed-off-by: David Vrabel <david.vrabel@...rix.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
[lizf: Backported to 3.4:
 - adjust context
 - call ACCESS_ONCE instead of READ_ONCE]
Signed-off-by: Zefan Li <lizefan@...wei.com>
---
 drivers/block/xen-blkback/common.h | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/block/xen-blkback/common.h b/drivers/block/xen-blkback/common.h
index 933adc5..47e5b65 100644
--- a/drivers/block/xen-blkback/common.h
+++ b/drivers/block/xen-blkback/common.h
@@ -256,8 +256,8 @@ static inline void blkif_get_x86_32_req(struct blkif_request *dst,
 					struct blkif_x86_32_request *src)
 {
 	int i, n = BLKIF_MAX_SEGMENTS_PER_REQUEST;
-	dst->operation = src->operation;
-	switch (src->operation) {
+	dst->operation = ACCESS_ONCE(src->operation);
+	switch (dst->operation) {
 	case BLKIF_OP_READ:
 	case BLKIF_OP_WRITE:
 	case BLKIF_OP_WRITE_BARRIER:
@@ -292,8 +292,8 @@ static inline void blkif_get_x86_64_req(struct blkif_request *dst,
 					struct blkif_x86_64_request *src)
 {
 	int i, n = BLKIF_MAX_SEGMENTS_PER_REQUEST;
-	dst->operation = src->operation;
-	switch (src->operation) {
+	dst->operation = ACCESS_ONCE(src->operation);
+	switch (dst->operation) {
 	case BLKIF_OP_READ:
 	case BLKIF_OP_WRITE:
 	case BLKIF_OP_WRITE_BARRIER:
-- 
1.9.1