linux-kernel - [PATCH] usercopy: ARM NOMMU has no 64-bit get

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Message-Id: <20170221220204.225288-1-arnd@arndb.de>
Date:   Tue, 21 Feb 2017 23:01:51 +0100
From:   Arnd Bergmann <arnd@...db.de>
To:     Kees Cook <keescook@...omium.org>, Hoeun Ryu <hoeun.ryu@...il.com>
Cc:     Arnd Bergmann <arnd@...db.de>, linux-kernel@...r.kernel.org
Subject: [PATCH] usercopy: ARM NOMMU has no 64-bit get_user

On a NOMMU ARM kernel, we get this link error:

ERROR: "__get_user_bad" [lib/test_user_copy.ko] undefined!

The problem is that the extended get_user/put_user definitions
were only added for the noral (MMU based) case.

We could add it for NOMMU as well, but it seems easier to just not
call it, since no other code needs it.

Fixes: 075c4ea5363d ("usercopy: Add tests for all get_user() sizes")
Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
 lib/test_user_copy.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/lib/test_user_copy.c b/lib/test_user_copy.c
index 4a79f2c1cd6e..361576b2cb3d 100644
--- a/lib/test_user_copy.c
+++ b/lib/test_user_copy.c
@@ -30,7 +30,8 @@
  * As there doesn't appear to be anything that can safely determine
  * their capability at compile-time, we just have to opt-out certain archs.
  */
-#if BITS_PER_LONG == 64 || (!defined(CONFIG_AVR32)  &&		\
+#if BITS_PER_LONG == 64 || (!(defined(CONFIG_ARM) && !defined(MMU)) && \
+			    !defined(CONFIG_AVR32)  &&		\
 			    !defined(CONFIG_BLACKFIN) &&	\
 			    !defined(CONFIG_M32R) &&		\
 			    !defined(CONFIG_M68K) &&		\
-- 
2.9.0