linux-kernel - Re: [PATCH v5 1/2] kernel/signal: Signal-based pre-coredump notification

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Message-ID: <20181130120344.GA25998@redhat.com>
Date:   Fri, 30 Nov 2018 13:03:45 +0100
From:   Oleg Nesterov <oleg@...hat.com>
To:     Dave Martin <Dave.Martin@....com>
Cc:     Enke Chen <enkechen@...co.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        "H. Peter Anvin" <hpa@...or.com>,
        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>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        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>,
        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>,
        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-kernel@...r.kernel.org>,
        "linux-arch@...r.kernel.org" <linux-arch@...r.kernel.org>,
        "Victor Kamensky (kamensky)" <kamensky@...co.com>,
        "xe-linux-external@...co.com" <xe-linux-external@...co.com>,
        Stefan Strogin <sstrogin@...co.com>
Subject: Re: [PATCH v5 1/2] kernel/signal: Signal-based pre-coredump
 notification

On 11/29, Dave Martin wrote:
>
> SIGCHLD + wait() is immune to this problem for other child status
> notifications (albeit with higher overhead).
>
> Unless I've missed something fundamental, signals simply aren't a
> reliable data transport

Yes. But I hope we are not going to implement WCOREDUMP.

I am not fan of this patch, but at least it is simple.

Oleg.