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

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Message-ID: <72a6d9bc-cfb9-a21a-960d-bb01331c0dd7@redhat.com>
Date:   Thu, 21 Feb 2019 11:47:49 -0600
From:   Eric Sandeen <sandeen@...hat.com>
To:     Luis Chamberlain <mcgrof@...nel.org>,
        Eric Sandeen <sandeen@...deen.net>,
        Andrew Morton <akpm@...ux-foundation.org>
Cc:     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 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

> 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?

Thanks,
-Eric