linux-kernel - Re: [PATCH v2 3/3] selftests/seccomp: Test SECCOMP_IOCTL_NOTIF

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Date:   Fri, 29 May 2020 07:29:37 -0600
From:   Tycho Andersen <tycho@...ho.ws>
To:     Kees Cook <keescook@...omium.org>
Cc:     Sargun Dhillon <sargun@...gun.me>, christian.brauner@...ntu.com,
        containers@...ts.linux-foundation.org, cyphar@...har.com,
        jannh@...gle.com, jeffv@...gle.com, linux-api@...r.kernel.org,
        linux-kernel@...r.kernel.org, palmer@...gle.com, rsesek@...gle.com,
        Matt Denton <mpdenton@...gle.com>
Subject: Re: [PATCH v2 3/3] selftests/seccomp: Test SECCOMP_IOCTL_NOTIF_ADDFD

On Fri, May 29, 2020 at 12:41:51AM -0700, Kees Cook wrote:
> On Thu, May 28, 2020 at 04:08:58AM -0700, Sargun Dhillon wrote:
> > +	EXPECT_EQ(ioctl(listener, SECCOMP_IOCTL_NOTIF_SEND, &resp), 0);
> > +
> > +	nextid = req.id + 1;
> > +
> > +	/* Wait for getppid to be called for the second time */
> > +	sleep(1);
> 
> I always rebel at finding "sleep" in tests. ;) Is this needed? IIUC,
> userspace will immediately see EINPROGRESS after the NOTIF_SEND
> finishes, yes?

Yes, I think we can just drop this, and I agree it's a good idea to do
so :)

Tycho