Re: [PATCH bpf-next v2 19/23] selftests/bpf: Add verifier tests for stack argument validation

Re: [PATCH bpf-next v2 19/23] selftests/bpf: Add verifier tests for stack argument validation

[Yonghong Song]

On 5/9/26 3:38 AM, sashiko-bot@kernel.org wrote:
> Thank you for your contribution! Sashiko AI review found 1 potential issue(s) to consider:
> - [Medium] The tests in `verifier_stack_arg_order.c` are never executed because the file is not registered in the selftests runner.
> --
>
> commit 6834becc44d439e99d840e596d30164699006d53
> Author: Yonghong Song <yonghong.song@linux.dev>
>
> selftests/bpf: Add verifier tests for stack argument validation
>
> This commit adds new BPF selftests using inline assembly to validate the
> verifier's logic for stack arguments. It covers positive tests and various
> negative tests for verifier rejection and pointer/reference tracking.
>
>> diff --git a/tools/testing/selftests/bpf/prog_tests/verifier.c b/tools/testing/selftests/bpf/prog_tests/verifier.c
>> index a96b25ebff234..aef21cf2987be 100644
>> --- a/tools/testing/selftests/bpf/prog_tests/verifier.c
>> +++ b/tools/testing/selftests/bpf/prog_tests/verifier.c
>> @@ -91,6 +91,7 @@
>>   #include "verifier_sockmap_mutate.skel.h"
>>   #include "verifier_spill_fill.skel.h"
>>   #include "verifier_spin_lock.skel.h"
>> +#include "verifier_stack_arg.skel.h"
> Did you intend to include verifier_stack_arg_order.skel.h here as well?

Yes.

>
>>   #include "verifier_stack_ptr.skel.h"
>>   #include "verifier_store_release.skel.h"
>>   #include "verifier_subprog_precision.skel.h"
>> @@ -238,6 +239,7 @@ void test_verifier_sock_addr(void)            { RUN(verifier_sock_addr); }
>>   void test_verifier_sockmap_mutate(void)       { RUN(verifier_sockmap_mutate); }
>>   void test_verifier_spill_fill(void)           { RUN(verifier_spill_fill); }
>>   void test_verifier_spin_lock(void)            { RUN(verifier_spin_lock); }
>> +void test_verifier_stack_arg(void)            { RUN(verifier_stack_arg); }
> Could this be missing a RUN(verifier_stack_arg_order) entry?

Yes. Thanks for capturing this. Will fix.

>
> The patch introduces the new tests for load ordering validation below,
> but without registering them in the selftests runner, it looks like
> they will not be executed.
>
> [ ... ]
>
>> diff --git a/tools/testing/selftests/bpf/progs/verifier_stack_arg_order.c b/tools/testing/selftests/bpf/progs/verifier_stack_arg_order.c
>> new file mode 100644
>> index 0000000000000..671c79969c6cd
>> --- /dev/null
>> +++ b/tools/testing/selftests/bpf/progs/verifier_stack_arg_order.c
>> @@ -0,0 +1,86 @@
>> +// SPDX-License-Identifier: GPL-2.0
>> +/* Copyright (c) 2026 Meta Platforms, Inc. and affiliates. */