The patch titled
Subject: lib/test_kasan.c: add workqueue test case
has been removed from the -mm tree. Its filename was
lib-test_kasanc-add-workqueue-test-case.patch
This patch was dropped because it was merged into mainline or a subsystem tree
------------------------------------------------------
From: Walter Wu <walter-zh.wu@xxxxxxxxxxxx>
Subject: lib/test_kasan.c: add workqueue test case
Adds a test to verify workqueue stack recording and print it 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 potentially related work creation:
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
Link: https://lkml.kernel.org/r/20201203022748.30681-1-walter-zh.wu@xxxxxxxxxxxx
Signed-off-by: Walter Wu <walter-zh.wu@xxxxxxxxxxxx>
Acked-by: Marco Elver <elver@xxxxxxxxxx>
Reviewed-by: Dmitry Vyukov <dvyukov@xxxxxxxxxx>
Reviewed-by: Andrey Konovalov <andreyknvl@xxxxxxxxxx>
Cc: Andrey Ryabinin <aryabinin@xxxxxxxxxxxxx>
Cc: Alexander Potapenko <glider@xxxxxxxxxx>
Cc: Matthias Brugger <matthias.bgg@xxxxxxxxx>
Cc: Jonathan Corbet <corbet@xxxxxxx>
Cc: Lai Jiangshan <jiangshanlai@xxxxxxxxx>
Cc: Tejun Heo <tj@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
lib/test_kasan_module.c | 29 +++++++++++++++++++++++++++++
1 file changed, 29 insertions(+)
--- a/lib/test_kasan_module.c~lib-test_kasanc-add-workqueue-test-case
+++ a/lib/test_kasan_module.c
@@ -91,6 +91,34 @@ static noinline void __init kasan_rcu_ua
call_rcu(&global_rcu_ptr->rcu, kasan_rcu_reclaim);
}
+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 test_kasan_module_init(void)
{
@@ -102,6 +130,7 @@ static int __init test_kasan_module_init
copy_user_test();
kasan_rcu_uaf();
+ kasan_workqueue_uaf();
kasan_restore_multi_shot(multishot);
return -EAGAIN;
_
Patches currently in -mm which might be from walter-zh.wu@xxxxxxxxxxxx are
