linux-kernel - [PATCH v2 2/4] lib/test_kasan: Add test for double-kzfree detection

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Message-Id: <20190626122018.171606-3-elver@google.com>
Date:   Wed, 26 Jun 2019 14:20:17 +0200
From:   Marco Elver <elver@...gle.com>
To:     aryabinin@...tuozzo.com, dvyukov@...gle.com, glider@...gle.com,
        andreyknvl@...gle.com
Cc:     linux-kernel@...r.kernel.org, Marco Elver <elver@...gle.com>,
        Christoph Lameter <cl@...ux.com>,
        Pekka Enberg <penberg@...nel.org>,
        David Rientjes <rientjes@...gle.com>,
        Joonsoo Kim <iamjoonsoo.kim@....com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        kasan-dev@...glegroups.com, linux-mm@...ck.org
Subject: [PATCH v2 2/4] lib/test_kasan: Add test for double-kzfree detection

Adds a simple test that checks if double-kzfree is being detected
correctly.

Signed-off-by: Marco Elver <elver@...gle.com>
Cc: Andrey Ryabinin <aryabinin@...tuozzo.com>
Cc: Dmitry Vyukov <dvyukov@...gle.com>
Cc: Alexander Potapenko <glider@...gle.com>
Cc: Andrey Konovalov <andreyknvl@...gle.com>
Cc: Christoph Lameter <cl@...ux.com>
Cc: Pekka Enberg <penberg@...nel.org>
Cc: David Rientjes <rientjes@...gle.com>
Cc: Joonsoo Kim <iamjoonsoo.kim@....com>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: kasan-dev@...glegroups.com
Cc: linux-kernel@...r.kernel.org
Cc: linux-mm@...ck.org
---
 lib/test_kasan.c | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/lib/test_kasan.c b/lib/test_kasan.c
index e3c593c38eff..dda5da9f5bd4 100644
--- a/lib/test_kasan.c
+++ b/lib/test_kasan.c
@@ -619,6 +619,22 @@ static noinline void __init kasan_strings(void)
 	strnlen(ptr, 1);
 }
 
+static noinline void __init kmalloc_double_kzfree(void)
+{
+	char *ptr;
+	size_t size = 16;
+
+	pr_info("double-free (kzfree)\n");
+	ptr = kmalloc(size, GFP_KERNEL);
+	if (!ptr) {
+		pr_err("Allocation failed\n");
+		return;
+	}
+
+	kzfree(ptr);
+	kzfree(ptr);
+}
+
 static int __init kmalloc_tests_init(void)
 {
 	/*
@@ -660,6 +676,7 @@ static int __init kmalloc_tests_init(void)
 	kasan_memchr();
 	kasan_memcmp();
 	kasan_strings();
+	kmalloc_double_kzfree();
 
 	kasan_restore_multi_shot(multishot);
 
-- 
2.22.0.410.gd8fdbe21b5-goog