[LTP] [PATCH] syscalls/keyctl/keyctl09.c: fix test encrypted key

[Nikolaus Voss]

On Wed, 12 Oct 2022, Petr Vorel wrote:
> Hi all,
>
>> Hi!
>>>> This commit fixes the test for adding encrypted keys with unencrypted data.
>>>> Unencryted data must be provided hex-ascii encoding. Due to a kernel
>>>> bug, the unencypted data was not decoded to binary thus the length of
>>>> the key was only half the specified key size. This patch doubles the key
>>>> size and adds a test with a wrong key size to trigger a corresponding
>>>> error.
>
>>>> This patch must be used with the kernel fix
>>>> https://lore.kernel.org/lkml/20220919072317.E41421357@mail.steuer-voss.de
>
>>> Petr, please correct me if I'm wrong.  Changing an existing LTP test so
>>> that it only works on kernels with the kernel patch applied, doesn't
>>> sound right.  The test should emit a warning if the original "valid
>>> payload" successfully loads.
>
>> We also have a policy not to work around any kernel bugs. So if this
>> really fixes a kernel bug it's okay that the test will fail on older
>> kernels without this fix and the patch that fixes kernel should be added
>> as a tag to the test.
>
> @Nikolaus, FYI:
> https://github.com/linux-test-project/ltp/wiki/C-Test-API#138-test-tags
>
> But the patchset has not been even accepted by kernel maintainer - searching in
> the kernel thread, looking into
> https://git.kernel.org/pub/scm/linux/kernel/git/pcmoore/lsm.git/
> and to the next tree.
> Or am I wrong and it has been accepted?
>
> Even once (if ever) the patch is accepted I agree with Mimi it'd be better to
> add new test than change existing old (better for diagnostic what exactly went
> wrong).

ok, thanks, I will change the test and repost when the kernel patch has 
been accepted!

Niko