From bb104ed78552147bed3a981fdada622afd2084b6 Mon Sep 17 00:00:00 2001
From: Marco Elver <elver@google.com>
Date: Thu, 11 Jul 2019 20:54:11 -0700
Subject: [PATCH] lib/test_kasan: Add test for double-kzfree detection
Add a simple test that checks if double-kzfree is being detected
correctly.
Link: http://lkml.kernel.org/r/20190626142014.141844-4-elver@google.com
Signed-off-by: Marco Elver <elver@google.com>
Reviewed-by: Andrey Ryabinin <aryabinin@virtuozzo.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Alexander Potapenko <glider@google.com>
Cc: Andrey Konovalov <andreyknvl@google.com>
Cc: Christoph Lameter <cl@linux.com>
Cc: Pekka Enberg <penberg@kernel.org>
Cc: David Rientjes <rientjes@google.com>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Kees Cook <keescook@chromium.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---
lib/test_kasan.c | 17 +++++++++++++++++
1 file changed, 17 insertions(+)
diff --git a/lib/test_kasan.c b/lib/test_kasan.c
index d85f25c65b0ac..b63b367a94e80 100644
--- a/lib/test_kasan.c
+++ b/lib/test_kasan.c
@@ -693,6 +693,22 @@ static noinline void __init kasan_bitops(void)
kfree(bits);
}
+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)
{
/*
@@ -735,6 +751,7 @@ static int __init kmalloc_tests_init(void)
kasan_memcmp();
kasan_strings();
kasan_bitops();
+ kmalloc_double_kzfree();
kasan_restore_multi_shot(multishot);
--
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