On Mon, Feb 26, 2024 at 11:04:12AM -0800, Kees Cook wrote:
> On Mon, Feb 26, 2024 at 05:23:35PM +0100, Mickaël Salaün wrote:
> > Remplace Landlock-specific TEST_F_FORK() with an improved TEST_F() which
> > brings four related changes:
> >
> > Run TEST_F()'s tests in a grandchild process to make it possible to
> > drop privileges and delegate teardown to the parent.
> >
> > Compared to TEST_F_FORK(), simplify handling of the test grandchild
> > process thanks to vfork(2), and makes it generic (e.g. no explicit
> > conversion between exit code and _metadata).
> >
> > Compared to TEST_F_FORK(), run teardown even when tests failed with an
> > assert thanks to commit 63e6b2a42342 ("selftests/harness: Run TEARDOWN
> > for ASSERT failures").
> >
> > Simplify the test harness code by removing the no_print and step fields
> > which are not used. I added this feature just after I made
> > kselftest_harness.h more broadly available but this step counter
> > remained even though it wasn't needed after all. See commit 369130b63178
> > ("selftests: Enhance kselftest_harness.h to print which assert failed").
>
> I'm personally fine dropping the step counter. (I do wonder if that
> removal should be split from the grandchild launching.)
I thought about that but it was not worth it to add more lines to
review.
>
> > Replace spaces with tabs in one line of __TEST_F_IMPL().
> >
> > Cc: Günther Noack <gnoack@xxxxxxxxxx>
> > Cc: Jakub Kicinski <kuba@xxxxxxxxxx>
> > Cc: Kees Cook <keescook@xxxxxxxxxxxx>
> > Cc: Shuah Khan <shuah@xxxxxxxxxx>
> > Cc: Will Drewry <wad@xxxxxxxxxxxx>
> > Signed-off-by: Mickaël Salaün <mic@xxxxxxxxxxx>
>
> One typo below, but otherwise seems good to me:
>
> Reviewed-by: Kees Cook <keescook@xxxxxxxxxxxx>
>
>
> > [...]
> > _metadata->setup_completed = true; \
> > - fixture_name##_##test_name(_metadata, &self, variant->data); \
> > + /* Use the same _metadata. */ \
> > + child = vfork(); \
> > + if (child == 0) { \
> > + fixture_name##_##test_name(_metadata, &self, variant->data); \
> > + _exit(0); \
> > + } \
> > + if (child < 0) { \
> > + ksft_print_msg("ERROR SPAWNING TEST GANDCHILD\n"); \
>
> typo: GAND -> GRAND
Good catch!
Jakub, please fix this with the next combined+rebased series. Thanks!
>
> --
> Kees Cook
>
