linux-kernel - Re: [PATCH] kernel/signal: Signal-based pre-coredump notification

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Message-ID: <614dad0f-97e3-91b4-0c29-c052d01922eb@cisco.com>
Date:   Mon, 15 Oct 2018 11:49:11 -0700
From:   Enke Chen <enkechen@...co.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        "H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
        Peter Zijlstra <peterz@...radead.org>,
        Arnd Bergmann <arnd@...db.de>,
        "Eric W. Biederman" <ebiederm@...ssion.com>,
        Khalid Aziz <khalid.aziz@...cle.com>,
        Kate Stewart <kstewart@...uxfoundation.org>,
        Helge Deller <deller@....de>,
        Al Viro <viro@...iv.linux.org.uk>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Christian Brauner <christian@...uner.io>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>,
        Dave Martin <Dave.Martin@....com>,
        Mauro Carvalho Chehab <mchehab+samsung@...nel.org>,
        Michal Hocko <mhocko@...nel.org>,
        Rik van Riel <riel@...riel.com>,
        "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        Roman Gushchin <guro@...com>,
        Marcos Paulo de Souza <marcos.souza.org@...il.com>,
        Oleg Nesterov <oleg@...hat.com>,
        Dominik Brodowski <linux@...inikbrodowski.net>,
        Cyrill Gorcunov <gorcunov@...nvz.org>,
        Yang Shi <yang.shi@...ux.alibaba.com>,
        Jann Horn <jannh@...gle.com>,
        Kees Cook <keescook@...omium.org>,
        linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org,
        "Victor Kamensky (kamensky)" <kamensky@...co.com>,
        xe-linux-external@...co.com, Stefan Strogin <sstrogin@...co.com>,
        Enke Chen <enkechen@...co.com>
Subject: Re: [PATCH] kernel/signal: Signal-based pre-coredump notification

Hi, Greg:

On 10/15/18 11:43 AM, Greg Kroah-Hartman wrote:
> On Mon, Oct 15, 2018 at 11:16:36AM -0700, Enke Chen wrote:
>> Hi, Greg:
>>
>>> Shouldn't there also be a manpage update, and a kselftest added for this
>>> new user/kernel api that is being created?
>>>
>>
>> I will submit a patch for manpage update once the code is accepted.
> 
> Writing a manpage update is key to see if what you are describing
> actually matches the code you have submitted.  You should do both at the
> same time so that they can be reviewed together.

Ok, will do at the same time. But should I submit it as a separate patch?

> 
>> Regarding the kselftest, I am not sure.  Once the prctl() is limited to
>> self (which I will do), the logic would be pretty straightforward. Not
>> sure if the selftest would add much value.
> 
> If you do not have a test for this feature, how do you know it even
> works at all?  How will you know if it breaks in a future kernel
> release?  Have you tested this?  If so, how?

I have the test code. I am just not sure whether I should submit and check
it in to the kselftest?

Thanks.  -- Enke