From: Walter Wu <walter-zh.wu@mediatek.com>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: Andrey Ryabinin <aryabinin@virtuozzo.com>,
Alexander Potapenko <glider@google.com>,
Dmitry Vyukov <dvyukov@google.com>,
Matthias Brugger <matthias.bgg@gmail.com>,
Andrey Konovalov <andreyknvl@google.com>, <linux-mm@kvack.org>,
<linux-kernel@vger.kernel.org>,
<linux-arm-kernel@lists.infradead.org>,
wsd_upstream <wsd_upstream@mediatek.com>,
<linux-mediatek@lists.infradead.org>,
Walter Wu <walter-zh.wu@mediatek.com>
Subject: [PATCH v8 3/4] kasan: add tests for call_rcu stack recording
Date: Sat, 11 Jul 2020 00:25:30 +0800 [thread overview]
Message-ID: <20200710162530.23946-1-walter-zh.wu@mediatek.com> (raw)
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(+)
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);
--
2.18.0
reply other threads:[~2020-07-10 16:25 UTC|newest]
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