Re: [PATCH v5 4/4] selftest: Taint kernel when test module loaded

[Brendan Higgins]

On Sat, Jul 2, 2022 at 12:10 AM David Gow <davidgow@xxxxxxxxxx> wrote:
>
> Make any kselftest test module (using the kselftest_module framework)
> taint the kernel with TAINT_TEST on module load.
>
> Also mark the module as a test module using MODULE_INFO(test, "Y") so
> that other tools can tell this is a test module. We can't rely solely
> on this, though, as these test modules are also often built-in.
>
> Finally, update the kselftest documentation to mention that the kernel
> should be tainted, and how to do so manually (as below).
>
> Note that several selftests use kernel modules which are not based on
> the kselftest_module framework, and so will not automatically taint the
> kernel.
>
> This can be done in two ways:
> - Moving the module to the tools/testing directory. All modules under
>   this directory will taint the kernel.
> - Adding the 'test' module property with:
>   MODULE_INFO(test, "Y")
>
> Similarly, selftests which do not load modules into the kernel generally
> should not taint the kernel (or possibly should only do so on failure),
> as it's assumed that testing from user-space should be safe. Regardless,
> they can write to /proc/sys/kernel/tainted if required.
>
> Reviewed-by: Luis Chamberlain <mcgrof@xxxxxxxxxx>
> Signed-off-by: David Gow <davidgow@xxxxxxxxxx>

Acked-by: Brendan Higgins <brendanhiggins@xxxxxxxxxx>