Subject: [PATCH 20/41] net/smc: Add warning about remote memory exposure

From: Christoph Hellwig <[email-masked]>
Date: Tue, 16 May 2017 09:51:38 +0300

[ Upstream commit 19a0f7e37c0761a0a1cbf550705a6063c9675223 ]

The driver explicitly bypasses APIs to register all memory once a
connection is made, and thus allows remote access to memory.

Signed-off-by: Christoph Hellwig <[email-masked]>
Signed-off-by: Leon Romanovsky <[email-masked]>
Acked-by: Ursula Braun <[email-masked]>
Signed-off-by: David S. Miller <[email-masked]>
---
 net/smc/Kconfig | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/net/smc/Kconfig b/net/smc/Kconfig
index c717ef0..3395485 100644
--- a/net/smc/Kconfig
+++ b/net/smc/Kconfig
@@ -8,6 +8,10 @@ config SMC
 	  The Linux implementation of the SMC-R solution is designed as
 	  a separate socket family SMC.
 
+	  Warning: SMC will expose all memory for remote reads and writes
+	  once a connection is established.  Don't enable this option except
+	  for tightly controlled lab environment.
+
 	  Select this option if you want to run SMC socket applications
 
 config SMC_DIAG
-- 
2.4.11