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

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Date:   Thu, 21 Feb 2019 11:59:20 -0600
From:   Eric Sandeen <sandeen@...deen.net>
To:     Luis Chamberlain <mcgrof@...nel.org>,
        Eric Sandeen <sandeen@...hat.com>
Cc:     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 2/21/19 11:52 AM, Luis Chamberlain wrote:
> 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.

Running it looks easy.  I'd like to know about how to extend it.

Thanks,
-Eric