CVE-2023-53235: In the Linux kernel, the following vulnerability has been resolved:  drm/tests: helpers: Avoid a driver uaf  when using __drm_kunit_helper_alloc_drm_device() the driver may be dereferenced by device-managed resources up until the device is freed, which is typically later than the kunit-managed resource code frees it. Fix this by simply make the driver device-managed as well.  In short, the sequence leading to the UAF is as follows:  INIT: Code allocates a struct device as a kunit-managed resource. Code allocates a drm driver as a kunit-managed resource. Code allocates a drm device as a device-managed resource.  EXIT: Kunit resource cleanup frees the drm driver Kunit resource cleanup puts the struct device, which starts a       device-managed resource cleanup device-managed cleanup calls drm_dev_put() drm_dev_put() dereferences the (now freed) drm driver -> Boom.  Related KASAN message: [55272.551542] ================================================================== [55272.551551] BUG: KASAN: slab-use-after-free in drm_dev_put.part.0+0xd4/0xe0 [drm] [55272.551603] Read of size 8 at addr ffff888127502828 by task kunit_try_catch/10353  [55272.551612] CPU: 4 PID: 10353 Comm: kunit_try_catch Tainted: G     U           N 6.5.0-rc7+ #155 [55272.551620] Hardware name: ASUS System Product Name/PRIME B560M-A AC, BIOS 0403 01/26/2021 [55272.551626] Call Trace: [55272.551629]  <TASK> [55272.551633]  dump_stack_lvl+0x57/0x90 [55272.551639]  print_report+0xcf/0x630 [55272.551645]  ? _raw_spin_lock_irqsave+0x5f/0x70 [55272.551652]  ? drm_dev_put.part.0+0xd4/0xe0 [drm] [55272.551694]  kasan_report+0xd7/0x110 [55272.551699]  ? drm_dev_put.part.0+0xd4/0xe0 [drm] [55272.551742]  drm_dev_put.part.0+0xd4/0xe0 [drm] [55272.551783]  devres_release_all+0x15d/0x1f0 [55272.551790]  ? __pfx_devres_release_all+0x10/0x10 [55272.551797]  device_unbind_cleanup+0x16/0x1a0 [55272.551802]  device_release_driver_internal+0x3e5/0x540 [55272.551808]  ? kobject_put+0x5d/0x4b0 [55272.551814]  bus_remove_device+0x1f1/0x3f0 [55272.551819]  device_del+0x342/0x910 [55272.551826]  ? __pfx_device_del+0x10/0x10 [55272.551830]  ? lock_release+0x339/0x5e0 [55272.551836]  ? kunit_remove_resource+0x128/0x290 [kunit] [55272.551845]  ? __pfx_lock_release+0x10/0x10 [55272.551851]  platform_device_del.part.0+0x1f/0x1e0 [55272.551856]  ? _raw_spin_unlock_irqrestore+0x30/0x60 [55272.551863]  kunit_remove_resource+0x195/0x290 [kunit] [55272.551871]  ? _raw_spin_unlock_irqrestore+0x30/0x60 [55272.551877]  kunit_cleanup+0x78/0x120 [kunit] [55272.551885]  ? __kthread_parkme+0xc1/0x1f0 [55272.551891]  ? __pfx_kunit_try_run_case_cleanup+0x10/0x10 [kunit] [55272.551900]  ? __pfx_kunit_generic_run_threadfn_adapter+0x10/0x10 [kunit] [55272.551909]  kunit_generic_run_threadfn_adapter+0x4a/0x90 [kunit] [55272.551919]  kthread+0x2e7/0x3c0 [55272.551924]  ? __pfx_kthread+0x10/0x10 [55272.551929]  ret_from_fork+0x2d/0x70 [55272.551935]  ? __pfx_kthread+0x10/0x10 [55272.551940]  ret_from_fork_asm+0x1b/0x30 [55272.551948]  </TASK>  [55272.551953] Allocated by task 10351: [55272.551956]  kasan_save_stack+0x1c/0x40 [55272.551962]  kasan_set_track+0x21/0x30 [55272.551966]  __kasan_kmalloc+0x8b/0x90 [55272.551970]  __kmalloc+0x5e/0x160 [55272.551976]  kunit_kmalloc_array+0x1c/0x50 [kunit] [55272.551984]  drm_exec_test_init+0xfa/0x2c0 [drm_exec_test] [55272.551991]  kunit_try_run_case+0xdd/0x250 [kunit] [55272.551999]  kunit_generic_run_threadfn_adapter+0x4a/0x90 [kunit] [55272.552008]  kthread+0x2e7/0x3c0 [55272.552012]  ret_from_fork+0x2d/0x70 [55272.552017]  ret_from_fork_asm+0x1b/0x30  [55272.552024] Freed by task 10353: [55272.552027]  kasan_save_stack+0x1c/0x40 [55272.552032]  kasan_set_track+0x21/0x30 [55272.552036]  kasan_save_free_info+0x27/0x40 [55272.552041]  __kasan_slab_free+0x106/0x180 [55272.552046]  slab_free_freelist_hook+0xb3/0x160 [55272.552051]  __kmem_cache_free+0xb2/0x290 [55272.552056]  kunit_remove_resource+0x195/0x290 [kunit] [55272.552064]  kunit_cleanup+0x7 ---truncated---