linux-hardening - Re: [PATCH v2 0/4] Increase mseal test coverage

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Message-ID: <ixoelxclkikscysvlmfbvciyig7pqjbuwwhhgawk6fy4iookya@kmsjo3oetgw5>
Date: Fri, 30 Aug 2024 13:31:42 +0100
From: Pedro Falcato <pedro.falcato@...il.com>
To: jeffxu@...omium.org
Cc: akpm@...ux-foundation.org, linux-kselftest@...r.kernel.org, 
	linux-mm@...ck.org, linux-hardening@...r.kernel.org, linux-kernel@...r.kernel.org, 
	willy@...radead.org, lorenzo.stoakes@...cle.com, broonie@...nel.org, vbabka@...e.cz, 
	Liam.Howlett@...cle.com, rientjes@...gle.com, keescook@...omium.org
Subject: Re: [PATCH v2 0/4] Increase mseal test coverage

On Thu, Aug 29, 2024 at 09:43:48PM GMT, jeffxu@...omium.org wrote:
> From: Jeff Xu <jeffxu@...omium.org>
> 
> This series increase the test coverage of mseal_test by:
> 
> Add check for vma_size, prot, and error code for existing tests.
> Add more testcases for madvise, munmap, mmap and mremap to cover
> sealing in different scenarios.
> 
> The increase test coverage hopefully help to prevent future regression.
> It doesn't change any existing mm api's semantics, i.e. it will pass on
> linux main and 6.10 branch.

I do want to be clear that we shouldn't confuse "test coverage" with being unequivocally good
if it has the possibility to paint ourselves into an API corner where details that should be left
unspecified are instead set in stone (e.g do we want to test how mprotect behaves if it finds an msealed
vma midway? no, apart from the property that really matters in this case (that sealed vmas remain untouched)).

> 
> Note: in order to pass this test in mm-unstable, mm-unstable must have
> Liam's fix on mmap [1]
> 
> [1] https://lore.kernel.org/linux-kselftest/vyllxuh5xbqmaoyl2mselebij5ox7cseekjcvl5gmzoxxwd2he@hxi4mpjanxzt/#t
> 
> History:
> V2:
> - remove the mmap fix (Liam R. Howlett will fix it separately)
> - Add cover letter (Lorenzo Stoakes)
> - split the testcase for ease of review (Mark Brown)
> 
> V1:
> - https://lore.kernel.org/linux-kselftest/20240828225522.684774-1-jeffxu@chromium.org/
> 
> Jeff Xu (4):
>   selftests/mm: mseal_test, add vma size check
>   selftests/mm: mseal_test add sealed madvise type
>   selftests/mm: mseal_test add more tests for mmap
>   selftests/mm: mseal_test add more tests for mremap
>

nit: Please follow a more standard commit naming scheme like
	selftests/mm: <change description>
or
	selftests/mseal: <change description>

-- 
Pedro