Subject: Re: [PATCH v5 10/10] selftests/harness: Handle TEST_F()'s explicit exit codes

From: Sean Christopherson <[email-masked]>
Date: Fri, 3 May 2024 07:17:16 -0700

On Fri, May 03, 2024, Mickaël Salaün wrote:
> If TEST_F() explicitly calls exit(code) with code different than 0, then
> _metadata->exit_code is set to this code (e.g. KVM_ONE_VCPU_TEST()).  We
> need to keep in mind that _metadata->exit_code can be KSFT_SKIP while
> the process exit code is 0.
> 
> Initial patch written by Sean Christopherson [1].

Heh, my pseudo patch barely has any relevance at this point.  How about replacing
that with:

  Reported-by: Sean Christopherson <[email-masked]>
  Closes: https://lore.kernel.org/r/[email-masked]

> Cc: Jakub Kicinski <[email-masked]>
> Cc: Kees Cook <[email-masked]>
> Cc: Mark Brown <[email-masked]>
> Cc: Sean Christopherson <[email-masked]>
> Cc: Shuah Khan <[email-masked]>
> Cc: Will Drewry <[email-masked]>
> Link: https://lore.kernel.org/r/[email-masked] [1]
> Fixes: 0710a1a73fb4 ("selftests/harness: Merge TEST_F_FORK() into TEST_F()")
> Signed-off-by: Mickaël Salaün <[email-masked]>
> Link: https://lore.kernel.org/r/[email-masked]
> ---
> 
> Changes since v4:
> * Check abort status when the grandchild exited.
> * Keep the _exit(0) calls because _metadata->exit_code is always
>   checked.
> * Only set _metadata->exit_code to WEXITSTATUS() if it is not zero.
> 
> Changes since v3:
> * New patch mainly from Sean Christopherson.
> ---
>  tools/testing/selftests/kselftest_harness.h | 6 +++++-
>  1 file changed, 5 insertions(+), 1 deletion(-)
> 
> diff --git a/tools/testing/selftests/kselftest_harness.h b/tools/testing/selftests/kselftest_harness.h
> index eb25f7c11949..7612bf09c5f8 100644
> --- a/tools/testing/selftests/kselftest_harness.h
> +++ b/tools/testing/selftests/kselftest_harness.h
> @@ -462,9 +462,13 @@ static inline pid_t clone3_vfork(void)
>  		munmap(teardown, sizeof(*teardown)); \
>  		if (self && fixture_name##_teardown_parent) \
>  			munmap(self, sizeof(*self)); \
> -		if (!WIFEXITED(status) && WIFSIGNALED(status)) \
> +		if (WIFEXITED(status)) { \
> +			if (WEXITSTATUS(status)) \
> +				_metadata->exit_code = WEXITSTATUS(status); \

Ah, IIUC, this works because __run_test() effectively forwards the exit_code?

	} else if (t->pid == 0) {
		setpgrp();
		t->fn(t, variant);
		_exit(t->exit_code);
	}

Tested-by: Sean Christopherson <[email-masked]>

> +		} else if (WIFSIGNALED(status)) { \
>  			/* Forward signal to __wait_for_test(). */ \
>  			kill(getpid(), WTERMSIG(status)); \
> +		} \
>  		__test_check_assert(_metadata); \
>  	} \
>  	static void __attribute__((constructor)) \
> -- 
> 2.45.0
>