linux-kernel - [RFC PATCH v2 3/3] block: Always use a bounce buffer when XPFO is enabled

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Message-Id: <20160914071901.8127-4-juerg.haefliger@hpe.com>
Date:   Wed, 14 Sep 2016 09:19:01 +0200
From:   Juerg Haefliger <juerg.haefliger@....com>
To:     linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        kernel-hardening@...ts.openwall.com, linux-x86_64@...r.kernel.org
Cc:     juerg.haefliger@....com, vpk@...columbia.edu
Subject: [RFC PATCH v2 3/3] block: Always use a bounce buffer when XPFO is enabled

This is a temporary hack to prevent the use of bio_map_user_iov()
which causes XPFO page faults.

Signed-off-by: Juerg Haefliger <juerg.haefliger@....com>
---
 block/blk-map.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/block/blk-map.c b/block/blk-map.c
index b8657fa8dc9a..e889dbfee6fb 100644
--- a/block/blk-map.c
+++ b/block/blk-map.c
@@ -52,7 +52,7 @@ static int __blk_rq_map_user_iov(struct request *rq,
 	struct bio *bio, *orig_bio;
 	int ret;
 
-	if (copy)
+	if (copy || IS_ENABLED(CONFIG_XPFO))
 		bio = bio_copy_user_iov(q, map_data, iter, gfp_mask);
 	else
 		bio = bio_map_user_iov(q, iter, gfp_mask);
-- 
2.9.3