linux-kernel - [PATCH 5/7] test_user_copy: Check __copy_{to,from}_user

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Date:	Wed, 5 Aug 2015 16:48:53 +0100
From:	James Hogan <james.hogan@...tec.com>
To:	<linux-kernel@...r.kernel.org>
CC:	<linux-arch@...r.kernel.org>, <linux-mips@...ux-mips.org>,
	James Hogan <james.hogan@...tec.com>,
	Kees Cook <keescook@...omium.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: [PATCH 5/7] test_user_copy: Check __copy_{to,from}_user_inatomic()

Add basic success/failure checking of __copy_to_user_inatomic() and
__copy_from_user_inatomic(). For testing purposes these are similar to
their non-atomic non-checking friends, so the new tests match those for
__copy_to_user() and __copy_from_user().

New tests:
- legitimate __copy_from_user_inatomic
- legitimate __copy_to_user_inatomic
- illegal all-kernel __copy_from_user_inatomic
- illegal reversed __copy_from_user_inatomic
- illegal all-kernel __copy_to_user_inatomic
- illegal reversed __copy_to_user_inatomic
- legitimate all-kernel __copy_from_user_inatomic
- legitimate all-kernel __copy_to_user_inatomic

Signed-off-by: James Hogan <james.hogan@...tec.com>
Cc: Kees Cook <keescook@...omium.org>
Cc: Andrew Morton <akpm@...ux-foundation.org>
---
 lib/test_user_copy.c | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/lib/test_user_copy.c b/lib/test_user_copy.c
index 310e796beef6..6cbdb0a15ca2 100644
--- a/lib/test_user_copy.c
+++ b/lib/test_user_copy.c
@@ -79,8 +79,12 @@ static int __init test_user_copy_init(void)
 		    "legitimate access_ok VERIFY_WRITE failed");
 	ret |= test(__copy_from_user(kmem, usermem, PAGE_SIZE),
 		    "legitimate __copy_from_user failed");
+	ret |= test(__copy_from_user_inatomic(kmem, usermem, PAGE_SIZE),
+		    "legitimate __copy_from_user_inatomic failed");
 	ret |= test(__copy_to_user(usermem, kmem, PAGE_SIZE),
 		    "legitimate __copy_to_user failed");
+	ret |= test(__copy_to_user_inatomic(usermem, kmem, PAGE_SIZE),
+		    "legitimate __copy_to_user_inatomic failed");
 	ret |= test(__copy_in_user(usermem, usermem + PAGE_SIZE, PAGE_SIZE),
 		    "legitimate __copy_in_user failed");
 	ret |= test(__get_user(value, (unsigned long __user *)usermem),
@@ -137,12 +141,25 @@ static int __init test_user_copy_init(void)
 	ret |= test(!__copy_from_user(bad_usermem, (char __user *)kmem,
 				      PAGE_SIZE),
 		    "illegal reversed __copy_from_user passed");
+	ret |= test(!__copy_from_user_inatomic(kmem,
+					(char __user *)(kmem + PAGE_SIZE),
+					PAGE_SIZE),
+		    "illegal all-kernel __copy_from_user_inatomic passed");
+	ret |= test(!__copy_from_user_inatomic(bad_usermem, (char __user *)kmem,
+					       PAGE_SIZE),
+		    "illegal reversed __copy_from_user_inatomic passed");
 	ret |= test(!__copy_to_user((char __user *)kmem, kmem + PAGE_SIZE,
 				    PAGE_SIZE),
 		    "illegal all-kernel __copy_to_user passed");
 	ret |= test(!__copy_to_user((char __user *)kmem, bad_usermem,
 				    PAGE_SIZE),
 		    "illegal reversed __copy_to_user passed");
+	ret |= test(!__copy_to_user_inatomic((char __user *)kmem,
+					     kmem + PAGE_SIZE, PAGE_SIZE),
+		    "illegal all-kernel __copy_to_user_inatomic passed");
+	ret |= test(!__copy_to_user_inatomic((char __user *)kmem, bad_usermem,
+					     PAGE_SIZE),
+		    "illegal reversed __copy_to_user_inatomic passed");
 	ret |= test(!__copy_in_user((char __user *)kmem,
 				    (char __user *)(kmem + PAGE_SIZE),
 				    PAGE_SIZE),
@@ -193,9 +210,16 @@ static int __init test_user_copy_init(void)
 	ret |= test(__copy_from_user(kmem, (char __user *)(kmem + PAGE_SIZE),
 				     PAGE_SIZE),
 		    "legitimate all-kernel __copy_from_user failed");
+	ret |= test(__copy_from_user_inatomic(kmem,
+					      (char __user *)(kmem + PAGE_SIZE),
+					      PAGE_SIZE),
+		    "legitimate all-kernel __copy_from_user_inatomic failed");
 	ret |= test(__copy_to_user((char __user *)kmem, kmem + PAGE_SIZE,
 				   PAGE_SIZE),
 		    "legitimate all-kernel __copy_to_user failed");
+	ret |= test(__copy_to_user_inatomic((char __user *)kmem,
+					    kmem + PAGE_SIZE, PAGE_SIZE),
+		    "legitimate all-kernel __copy_to_user_inatomic failed");
 	ret |= test(__copy_in_user((char __user *)kmem,
 				   (char __user *)(kmem + PAGE_SIZE),
 				   PAGE_SIZE),
-- 
2.3.6

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