From 387d6e46681b0d5b64f5d13639f90e3df15e020d Mon Sep 17 00:00:00 2001
From: Walter Wu <walter-zh.wu@mediatek.com>
Date: Thu, 6 Aug 2020 23:24:42 -0700
Subject: [PATCH] kasan: add tests for call_rcu stack recording
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>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Tested-by: Dmitry Vyukov <dvyukov@google.com>
Reviewed-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>
Cc: Joel Fernandes <joel@joelfernandes.org>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Josh Triplett <josh@joshtriplett.org>
Cc: Lai Jiangshan <jiangshanlai@gmail.com>
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Cc: "Paul E . McKenney" <paulmck@kernel.org>
Link: http://lkml.kernel.org/r/20200601051045.1294-1-walter-zh.wu@mediatek.com
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---
lib/test_kasan.c | 30 ++++++++++++++++++++++++++++++
1 file changed, 30 insertions(+)
diff --git a/lib/test_kasan.c b/lib/test_kasan.c
index e4d9a86b174b4..7f95f85421b22 100644
--- a/lib/test_kasan.c
+++ b/lib/test_kasan.c
@@ -801,6 +801,35 @@ 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)
{
/*
@@ -848,6 +877,7 @@ static int __init kmalloc_tests_init(void)
kasan_bitops();
kmalloc_double_kzfree();
vmalloc_oob();
+ kasan_rcu_uaf();
kasan_restore_multi_shot(multishot);
--
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