[PATCH v3 0/2] drm/tests: Fix for UAF and a test for drm_exec lock alloc tracking warning

[Christian König]

Am 07.09.23 um 15:53 schrieb Thomas Hellström:
> While trying to replicate a weird drm_exec lock alloc tracking warning
> using the drm_exec kunit test, the warning was shadowed by a UAF warning
> from KASAN due to a bug in the drm kunit helpers.
>
> Patch 1 fixes that drm kunit UAF.
> Patch 2 introduces a drm_exec kunit subtest that fails if the conditions
>        for the weird warning are met.
>
> The series previously also had a patch with a drm_exec workaround for the
> warning but that patch has already been commited to drm_misc_next_fixes.

Thinking more about this what happens when somebody calls 
drm_exec_unlock_obj() on the first locked object?

Christian.

>
> v2:
> - Rewording of commit messages
> - Add some commit message tags
> v3:
> - Remove an already committed patch
> - Rework the test to not require dmesg inspection (Maxime Ripard)
> - Condition the test on CONFIG_LOCK_ALLOC
> - Update code comments and commit messages (Maxime Ripard)
>
> Cc: Maxime Ripard <mripard at kernel.org>
> Cc: Christian König <christian.koenig at amd.com>
>
> Thomas Hellström (2):
>    drm/tests: helpers: Avoid a driver uaf
>    drm/tests/drm_exec: Add a test for object freeing within
>      drm_exec_fini()
>
>   drivers/gpu/drm/tests/drm_exec_test.c | 82 +++++++++++++++++++++++++++
>   include/drm/drm_kunit_helpers.h       |  4 +-
>   2 files changed, 85 insertions(+), 1 deletion(-)
>