[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-Id: <20191017012506.28503-3-dja@axtens.net>
Date: Thu, 17 Oct 2019 12:25:03 +1100
From: Daniel Axtens <dja@...ens.net>
To: kasan-dev@...glegroups.com, linux-mm@...ck.org, x86@...nel.org,
aryabinin@...tuozzo.com, glider@...gle.com, luto@...nel.org,
linux-kernel@...r.kernel.org, mark.rutland@....com,
dvyukov@...gle.com, christophe.leroy@....fr
Cc: linuxppc-dev@...ts.ozlabs.org, gor@...ux.ibm.com,
Daniel Axtens <dja@...ens.net>
Subject: [PATCH v9 2/5] kasan: add test for vmalloc
Test kasan vmalloc support by adding a new test to the module.
Signed-off-by: Daniel Axtens <dja@...ens.net>
--
v5: split out per Christophe Leroy
---
lib/test_kasan.c | 26 ++++++++++++++++++++++++++
1 file changed, 26 insertions(+)
diff --git lib/test_kasan.c lib/test_kasan.c
index 49cc4d570a40..328d33beae36 100644
--- lib/test_kasan.c
+++ 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
Powered by blists - more mailing lists