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SubjectRe: [PATCH v6 3/4] kasan: add tests for call_rcu stack recording
On Fri, May 22, 2020 at 4:02 AM Walter Wu <walter-zh.wu@mediatek.com> wrote:
>
> Test call_rcu() call stack recording and verify whether it correctly
> is printed in KASAN report.

Reviewed-and-tested-by: Dmitry Vyukov <dvyukov@google.com>

> Signed-off-by: Walter Wu <walter-zh.wu@mediatek.com>
> Cc: Andrey Ryabinin <aryabinin@virtuozzo.com>
> Cc: Dmitry Vyukov <dvyukov@google.com>
> Cc: Alexander Potapenko <glider@google.com>
> Cc: Matthias Brugger <matthias.bgg@gmail.com>
> ---
> lib/test_kasan.c | 30 ++++++++++++++++++++++++++++++
> 1 file changed, 30 insertions(+)
>
> diff --git a/lib/test_kasan.c b/lib/test_kasan.c
> index e3087d90e00d..6e5fb05d42d8 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_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_ptr = rcu_dereference_protected(ptr, NULL);
> + call_rcu(&global_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
>
> --
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