linux-kernel - Re: [PATCH] sysctl: Fix proc_do_large

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Date:   Thu, 21 Feb 2019 09:52:32 -0800
From:   Luis Chamberlain <mcgrof@...nel.org>
To:     Eric Sandeen <sandeen@...hat.com>
Cc:     Eric Sandeen <sandeen@...deen.net>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        fsdevel <linux-fsdevel@...r.kernel.org>, netdev@...r.kernel.org,
        Kees Cook <keescook@...omium.org>
Subject: Re: [PATCH] sysctl: Fix proc_do_large_bitmap for large input buffers

On Thu, Feb 21, 2019 at 11:47:49AM -0600, Eric Sandeen wrote:
> On 2/21/19 9:18 AM, Luis Chamberlain wrote:
> > On Wed, Feb 20, 2019 at 05:35:04PM -0600, Eric Sandeen wrote:
> >> Here's a pretty hacky test script to test this code via
> >> ip_local_reserved_ports
> > 
> > Thanks Eric!
> > 
> > So /proc/sys/net/ipv4/ip_local_reserved_ports is a production knob, and
> > if we wanted to stress test it with a selftest it could break other self
> > tests or change the system behaviour. Because of this we have now have
> > lib/test_sysctl.c, and we test this with the script:
> > 
> > tools/testing/selftests/sysctl/sysctl.sh
> > 
> > Any chance you can extend lib/test_sysctl.c with a new respective bitmap
> > knob,
> 
> Done

Thanks!

> > and add a respective test? This will ensure we don't regress
> > later. 0-day runs sysctl.sh so it should catch any regressions in the
> > future.
> 
> As you know, learning somebody else's test harness infra is a PITA. ;)
> Can you find me off-list and give me a hand with this?

Sure, its actually quite simple, just as root, run the script.

  Luis