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[v8,3/4] kasan: add tests for call_rcu stack recording

Message ID 20200710162530.23946-1-walter-zh.wu@mediatek.com (mailing list archive)
State New, archived
Headers show
Series kasan: memorize and print call_rcu stack | expand

Commit Message

Walter Wu July 10, 2020, 4:25 p.m. UTC 
Test call_rcu() call stack recording and verify whether it correctly
is printed in KASAN report.

Signed-off-by: Walter Wu <walter-zh.wu@mediatek.com>
Reviewed-and-tested-by: Dmitry Vyukov <dvyukov@google.com>
Reviewed-by: Andrey Konovalov <andreyknvl@google.com>
Cc: Andrey Ryabinin <aryabinin@virtuozzo.com>
Cc: Alexander Potapenko <glider@google.com>
Cc: Matthias Brugger <matthias.bgg@gmail.com>
---

Changes since v6:
- renamed the variable name in testcase

---
 lib/test_kasan.c | 30 ++++++++++++++++++++++++++++++
 1 file changed, 30 insertions(+)
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Patch

diff --git a/lib/test_kasan.c b/lib/test_kasan.c
index e3087d90e00d..19c72c1501ef 100644
--- a/lib/test_kasan.c
+++ b/lib/test_kasan.c
@@ -792,6 +792,35 @@  static noinline void __init vmalloc_oob(void)
 static void __init vmalloc_oob(void) {}
 #endif
 
+static struct kasan_rcu_info {
+	int i;
+	struct rcu_head rcu;
+} *global_rcu_ptr;
+
+static noinline void __init kasan_rcu_reclaim(struct rcu_head *rp)
+{
+	struct kasan_rcu_info *fp = container_of(rp,
+						struct kasan_rcu_info, rcu);
+
+	kfree(fp);
+	fp->i = 1;
+}
+
+static noinline void __init kasan_rcu_uaf(void)
+{
+	struct kasan_rcu_info *ptr;
+
+	pr_info("use-after-free in kasan_rcu_reclaim\n");
+	ptr = kmalloc(sizeof(struct kasan_rcu_info), GFP_KERNEL);
+	if (!ptr) {
+		pr_err("Allocation failed\n");
+		return;
+	}
+
+	global_rcu_ptr = rcu_dereference_protected(ptr, NULL);
+	call_rcu(&global_rcu_ptr->rcu, kasan_rcu_reclaim);
+}
+
 static int __init kmalloc_tests_init(void)
 {
 	/*
@@ -839,6 +868,7 @@  static int __init kmalloc_tests_init(void)
 	kasan_bitops();
 	kmalloc_double_kzfree();
 	vmalloc_oob();
+	kasan_rcu_uaf();
 
 	kasan_restore_multi_shot(multishot);