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Mon, 10 Aug 2020 15:27:09 +0800 From: Walter Wu To: Andrey Ryabinin , Alexander Potapenko , Dmitry Vyukov , Matthias Brugger CC: , , , , wsd_upstream , , Walter Wu Subject: [PATCH 4/5] lib/test_kasan.c: add workqueue test case Date: Mon, 10 Aug 2020 15:27:09 +0800 Message-ID: <20200810072709.827-1-walter-zh.wu@mediatek.com> X-Mailer: git-send-email 2.18.0 MIME-Version: 1.0 X-MTK: N X-Rspamd-Queue-Id: 30BF51A4A0 X-Spamd-Result: default: False [0.00 / 100.00] X-Rspamd-Server: rspam02 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: Adds a test case to verify workqueue stack recording and print the last workqueue stack in KASAN report. The KASAN report was as follows(cleaned up slightly): BUG: KASAN: use-after-free in kasan_workqueue_uaf Freed by task 54: kasan_save_stack+0x24/0x50 kasan_set_track+0x24/0x38 kasan_set_free_info+0x20/0x40 __kasan_slab_free+0x10c/0x170 kasan_slab_free+0x10/0x18 kfree+0x98/0x270 kasan_workqueue_work+0xc/0x18 Last workqueue stack: kasan_save_stack+0x24/0x50 kasan_record_wq_stack+0xa8/0xb8 insert_work+0x48/0x288 __queue_work+0x3e8/0xc40 queue_work_on+0xf4/0x118 kasan_workqueue_uaf+0xfc/0x190 Signed-off-by: Walter Wu Cc: Andrey Ryabinin Cc: Dmitry Vyukov Cc: Alexander Potapenko Cc: Matthias Brugger --- lib/test_kasan.c | 30 ++++++++++++++++++++++++++++++ 1 file changed, 30 insertions(+) diff --git a/lib/test_kasan.c b/lib/test_kasan.c index c3c6e22ec959..2c6c20cd154b 100644 --- a/lib/test_kasan.c +++ b/lib/test_kasan.c @@ -869,6 +869,35 @@ static noinline void __init kasan_timer_uaf(void) ((volatile struct timer_list *)timer)->expires; } +static noinline void __init kasan_workqueue_work(struct work_struct *work) +{ + kfree(work); +} + +static noinline void __init kasan_workqueue_uaf(void) +{ + struct workqueue_struct *workqueue; + struct work_struct *work; + + workqueue = create_workqueue("kasan_wq_test"); + if (!workqueue) { + pr_err("Allocation failed\n"); + return; + } + work = kmalloc(sizeof(struct work_struct), GFP_KERNEL); + if (!work) { + pr_err("Allocation failed\n"); + return; + } + + INIT_WORK(work, kasan_workqueue_work); + queue_work(workqueue, work); + destroy_workqueue(workqueue); + + pr_info("use-after-free on workqueue\n"); + ((volatile struct work_struct *)work)->data; +} + static int __init kmalloc_tests_init(void) { /* @@ -918,6 +947,7 @@ static int __init kmalloc_tests_init(void) vmalloc_oob(); kasan_rcu_uaf(); kasan_timer_uaf(); + kasan_workqueue_uaf(); kasan_restore_multi_shot(multishot);