linux-hardening - Re: [PATCH v3 7/7] kunit: Add tests for fault

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Date: Fri, 19 Apr 2024 15:33:46 -0700
From: Guenter Roeck <linux@...ck-us.net>
To: Mickaël Salaün <mic@...ikod.net>
Cc: Brendan Higgins <brendanhiggins@...gle.com>,
	David Gow <davidgow@...gle.com>, Rae Moar <rmoar@...gle.com>,
	Shuah Khan <skhan@...uxfoundation.org>,
	Alan Maguire <alan.maguire@...cle.com>,
	Borislav Petkov <bp@...en8.de>,
	Dave Hansen <dave.hansen@...ux.intel.com>,
	"H . Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...hat.com>,
	James Morris <jamorris@...ux.microsoft.com>,
	Kees Cook <keescook@...omium.org>,
	Luis Chamberlain <mcgrof@...nel.org>,
	"Madhavan T . Venkataraman" <madvenka@...ux.microsoft.com>,
	Marco Pagani <marpagan@...hat.com>,
	Paolo Bonzini <pbonzini@...hat.com>,
	Sean Christopherson <seanjc@...gle.com>,
	Stephen Boyd <sboyd@...nel.org>,
	Thara Gopinath <tgopinath@...rosoft.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Vitaly Kuznetsov <vkuznets@...hat.com>,
	Wanpeng Li <wanpengli@...cent.com>,
	Zahra Tarkhani <ztarkhani@...rosoft.com>, kvm@...r.kernel.org,
	linux-hardening@...r.kernel.org, linux-hyperv@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-security-module@...r.kernel.org,
	linux-um@...ts.infradead.org, x86@...nel.org
Subject: Re: [PATCH v3 7/7] kunit: Add tests for fault

Hi,

On Tue, Mar 19, 2024 at 11:48:57AM +0100, Mickaël Salaün wrote:
> Add a test case to check NULL pointer dereference and make sure it would
> result as a failed test.
> 
> The full kunit_fault test suite is marked as skipped when run on UML
> because it would result to a kernel panic.
> 
> Tested with:
> ./tools/testing/kunit/kunit.py run --arch x86_64 kunit_fault
> ./tools/testing/kunit/kunit.py run --arch arm64 \
>   --cross_compile=aarch64-linux-gnu- kunit_fault
> 

What is the rationale for adding those tests unconditionally whenever
CONFIG_KUNIT_TEST is enabled ? This completely messes up my test system
because it concludes that it is pointless to continue testing
after the "Unable to handle kernel NULL pointer dereference" backtrace.
At the same time, it is all or nothing, meaning I can not disable
it but still run other kunit tests.

Guenter