Commit 387d6e46 authored Aug 06, 2020 by Walter Wu Committed by Linus Torvalds Aug 07, 2020

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>

parent e4b7818b

lib/test_kasan.c

+30 −0

Original line number	Diff line number	Diff line
		@@ -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);

Admin message