linux-kernel - Re: [PATCH v11 2/2] selftests: add tests for clone3() with *set

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Message-ID: <20191115225343.v6x6vltvxgv54ewl@wittgenstein>
Date:   Fri, 15 Nov 2019 23:53:44 +0100
From:   Christian Brauner <christian.brauner@...ntu.com>
To:     Andrei Vagin <avagin@...il.com>
Cc:     Adrian Reber <areber@...hat.com>,
        Eric Biederman <ebiederm@...ssion.com>,
        Pavel Emelyanov <ovzxemul@...il.com>,
        Jann Horn <jannh@...gle.com>, Oleg Nesterov <oleg@...hat.com>,
        Dmitry Safonov <0x7f454c46@...il.com>,
        Rasmus Villemoes <linux@...musvillemoes.dk>,
        linux-kernel@...r.kernel.org, Mike Rapoport <rppt@...ux.ibm.com>,
        Radostin Stoyanov <rstoyanov1@...il.com>
Subject: Re: [PATCH v11 2/2] selftests: add tests for clone3() with *set_tid

On Fri, Nov 15, 2019 at 02:20:18PM -0800, Andrei Vagin wrote:
> On Fri, Nov 15, 2019 at 01:36:21PM +0100, Adrian Reber wrote:
> > This tests clone3() with *set_tid to see if all desired PIDs are working
> > as expected. The tests are trying multiple invalid input parameters as
> > well as creating processes while specifying a certain PID in multiple
> > PID namespaces at the same time.
> > 
> > Additionally this moves common clone3() test code into clone3_selftests.h.
> > 
> > Signed-off-by: Adrian Reber <areber@...hat.com>
> > ---
> > v9:
> >  - applied all changes from Christian's review (except using the
> >    NSpid: parsing code from selftests/pidfd/pidfd_fdinfo_test.c)
> > 
> > v10:
> >  - added even more '\n' and include file fixes (Christian)
> > 
> > v11:
> >  - added more return code checking at multiple places (Andrei)
> >  - also add set_tid/set_tid_size to internal struct (Andrei)
> 
> I think we can add a test case to trigger the issue what I found in the
> previous version of the kernel patch. You can find my version of this
> test case in the attached patch.
> 
> nit: we need to flush stdout and stderr buffers before calling the raw
> clone3 syscall and _exit(). Otherwise, some log messages can be lost and
> some of them can be printed twice.
> 
> To trigger this issue, you can run the test and redirect its output to
> file or pipe:
> 
> $ ./clone3_set_tid | cat
> 
> I have attached the patch to address both these problems. It is a draft
> version and may require some work.
> 
> Adrian and Christian, it is up to you to decide whether we want to
> update the current patch or to fix this on top by a separate patch.

If you give me a proper commit with a commit message I'll put it on top
as another patch. :)

Christian