From: Daniel Axtens <dja@axtens.net>
To: kasan-dev@googlegroups.com, linux-mm@kvack.org, x86@kernel.org,
aryabinin@virtuozzo.com, glider@google.com, luto@kernel.org,
linux-kernel@vger.kernel.org, mark.rutland@arm.com,
dvyukov@google.com, christophe.leroy@c-s.fr
Cc: linuxppc-dev@lists.ozlabs.org, gor@linux.ibm.com,
Daniel Axtens <dja@axtens.net>
Subject: [PATCH v7 2/5] kasan: add test for vmalloc
Date: Wed, 4 Sep 2019 00:55:33 +1000 [thread overview]
Message-ID: <20190903145536.3390-3-dja@axtens.net> (raw)
In-Reply-To: <20190903145536.3390-1-dja@axtens.net>
Test kasan vmalloc support by adding a new test to the module.
Signed-off-by: Daniel Axtens <dja@axtens.net>
--
v5: split out per Christophe Leroy
---
lib/test_kasan.c | 26 ++++++++++++++++++++++++++
1 file changed, 26 insertions(+)
diff --git a/lib/test_kasan.c b/lib/test_kasan.c
index 49cc4d570a40..328d33beae36 100644
--- a/lib/test_kasan.c
+++ b/lib/test_kasan.c
@@ -19,6 +19,7 @@
#include <linux/string.h>
#include <linux/uaccess.h>
#include <linux/io.h>
+#include <linux/vmalloc.h>
#include <asm/page.h>
@@ -748,6 +749,30 @@ static noinline void __init kmalloc_double_kzfree(void)
kzfree(ptr);
}
+#ifdef CONFIG_KASAN_VMALLOC
+static noinline void __init vmalloc_oob(void)
+{
+ void *area;
+
+ pr_info("vmalloc out-of-bounds\n");
+
+ /*
+ * We have to be careful not to hit the guard page.
+ * The MMU will catch that and crash us.
+ */
+ area = vmalloc(3000);
+ if (!area) {
+ pr_err("Allocation failed\n");
+ return;
+ }
+
+ ((volatile char *)area)[3100];
+ vfree(area);
+}
+#else
+static void __init vmalloc_oob(void) {}
+#endif
+
static int __init kmalloc_tests_init(void)
{
/*
@@ -793,6 +818,7 @@ static int __init kmalloc_tests_init(void)
kasan_strings();
kasan_bitops();
kmalloc_double_kzfree();
+ vmalloc_oob();
kasan_restore_multi_shot(multishot);
--
2.20.1
next prev parent reply other threads:[~2019-09-03 14:55 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-09-03 14:55 [PATCH v7 0/5] kasan: support backing vmalloc space with real shadow memory Daniel Axtens
2019-09-03 14:55 ` [PATCH v7 1/5] " Daniel Axtens
2019-09-03 14:55 ` Daniel Axtens [this message]
2019-09-03 14:55 ` [PATCH v7 3/5] fork: support VMAP_STACK with KASAN_VMALLOC Daniel Axtens
2019-09-03 14:55 ` [PATCH v7 4/5] x86/kasan: support KASAN_VMALLOC Daniel Axtens
2019-09-03 14:55 ` [PATCH v7 5/5] kasan debug: track pages allocated for vmalloc shadow Daniel Axtens
2019-09-03 15:01 ` Andrey Konovalov
2019-09-03 23:41 ` Daniel Axtens
2019-09-11 6:27 ` [PATCH v7 0/5] kasan: support backing vmalloc space with real shadow memory Christophe Leroy
2019-09-11 11:20 ` Daniel Axtens
2019-09-11 12:38 ` Christophe Leroy
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