On Fri, 1 Mar 2024 at 01:04, Mickaël Salaün <mic@xxxxxxxxxxx> wrote: > > Hi, > Thanks very much. I think there's a lot going on in this series, and it'd probably be easier to address if it were broken up a bit more. To take things one at a time: > This patch series moves KUnit test execution at the very end of kernel > initialization, just before launching the init process. This opens the > way to test any kernel code in its normal state (i.e. fully > initialized). I like the general idea here, but there are a few things to keep in mind: - We can already do this with tests built as modules. - We have explicit support for testing __init code, so if we want to keep that (and I think we do), we'll need to make sure that there remains a way to run tests before __init. - Behaviour changes here will need to be documented and tested well across all tests and architectures, so it's not something I'd want to land quickly. - The requirement to have a root filesystem set up is another thing we'll want to handle carefully. - As-is, the patch seems to break arm64. > > This patch series also teaches KUnit to handle kthread faults as errors, > and it brings a few related fixes and improvements. These seem very good overall. I want to look at the last location stuff in a bit more detail, but otherwise this is okay. Personally, I'd like to see this split out into a separate series, partly because I don't want to delay it while we sort the other parts of this series out, and partly because I have some other changes to the thread context stuff I think we need to make. > > New tests check NULL pointer dereference and read-only memory, which > wasn't possible before. These look interesting, but I don't like that they are listed as x86-specific. > > This is useful to test current kernel self-protection mechanisms or > future ones such as Heki: https://github.com/heki-linux > > Regards, Thanks again. I'll do a more detailed review of the individual patches next week, but I'm excited to see this overall. Cheers, -- David > > Mickaël Salaün (8): > kunit: Run tests when the kernel is fully setup > kunit: Handle thread creation error > kunit: Fix kthread reference > kunit: Fix timeout message > kunit: Handle test faults > kunit: Fix KUNIT_SUCCESS() calls in iov_iter tests > kunit: Print last test location on fault > kunit: Add tests for faults > > include/kunit/test.h | 24 +++++- > include/kunit/try-catch.h | 3 - > init/main.c | 4 +- > lib/bitfield_kunit.c | 8 +- > lib/checksum_kunit.c | 2 +- > lib/kunit/executor.c | 81 ++++++++++++++------ > lib/kunit/kunit-example-test.c | 6 +- > lib/kunit/kunit-test.c | 115 +++++++++++++++++++++++++++- > lib/kunit/try-catch.c | 33 +++++--- > lib/kunit_iov_iter.c | 70 ++++++++--------- > tools/testing/kunit/kunit_kernel.py | 6 +- > 11 files changed, 261 insertions(+), 91 deletions(-) > > > base-commit: d206a76d7d2726f3b096037f2079ce0bd3ba329b > -- > 2.44.0 >
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