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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
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