linux-hardening - Re: [PATCH 1/2] selftests/harness: Run TEARDOWN for ASSERT failures

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Message-ID: <f705c381-cbe6-0862-e10f-44f2afdef24d@linuxfoundation.org>
Date:   Fri, 25 Mar 2022 13:37:20 -0600
From:   Shuah Khan <skhan@...uxfoundation.org>
To:     Kees Cook <keescook@...omium.org>, shuah@...nel.org
Cc:     Andy Lutomirski <luto@...capital.net>,
        Will Drewry <wad@...omium.org>,
        linux-kselftest@...r.kernel.org,
        Willem de Bruijn <willemb@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>, linux-kernel@...r.kernel.org,
        linux-hardening@...r.kernel.org,
        Shuah Khan <skhan@...uxfoundation.org>
Subject: Re: [PATCH 1/2] selftests/harness: Run TEARDOWN for ASSERT failures

On 3/24/22 5:19 PM, Kees Cook wrote:
> The kselftest test harness has traditionally not run the registered
> TEARDOWN handler when a test encountered an ASSERT. This creates
> unexpected situations and tests need to be very careful about using
> ASSERT, which seems a needless hurdle for test writers.
> 
> Because of the harness's design for optional failure handlers, the
> original implementation of ASSERT used an abort() to immediately
> stop execution, but that meant the context for running teardown was
> lost. Instead, use setjmp/longjmp so that teardown can be done.
> 

Thanks for the patch. The change look good to me.

> Failed SETUP routines continue to not be followed by TEARDOWN, though.

Does this mean failed setup() routines have to handle TEARDOWN? What
are guidelines to follow for setup() failures?

Can you add a bit more detail on what you meant by " Failed SETUP
routines continue to not be followed by TEARDOWN, though".

With that:

Reviewed-by: Shuah Khan <skhan@...uxfoundation.org>

thanks,
-- Shuah