linux-kernel - Re: [PATCH 1/1] mm: introduce process

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20210709085857.zf5ik3btet3yw4ab@wittgenstein>
Date:   Fri, 9 Jul 2021 10:58:57 +0200
From:   Christian Brauner <christian.brauner@...ntu.com>
To:     Suren Baghdasaryan <surenb@...gle.com>
Cc:     Michal Hocko <mhocko@...e.com>,
        David Hildenbrand <david@...hat.com>,
        Andy Lutomirski <luto@...nel.org>,
        Johannes Weiner <hannes@...xchg.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        David Rientjes <rientjes@...gle.com>,
        Matthew Wilcox <willy@...radead.org>,
        Roman Gushchin <guro@...com>, Rik van Riel <riel@...riel.com>,
        Minchan Kim <minchan@...nel.org>,
        Christian Brauner <christian@...uner.io>,
        Christoph Hellwig <hch@...radead.org>,
        Oleg Nesterov <oleg@...hat.com>, Jann Horn <jannh@...gle.com>,
        Shakeel Butt <shakeelb@...gle.com>,
        Tim Murray <timmurray@...gle.com>,
        Linux API <linux-api@...r.kernel.org>,
        Linux-MM <linux-mm@...ck.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Android Kernel Team <kernel-team@...roid.com>
Subject: Re: [PATCH 1/1] mm: introduce process_reap system call

On Wed, Jul 07, 2021 at 02:14:23PM -0700, Suren Baghdasaryan wrote:
> On Wed, Jul 7, 2021 at 5:38 AM Michal Hocko <mhocko@...e.com> wrote:
> >
> > On Mon 05-07-21 09:41:54, David Hildenbrand wrote:
> > > On 02.07.21 17:27, Christian Brauner wrote:
> > [...]
> > > > That one was my favorite from the list I gave too but maybe we can
> > > > satisfy Andy too if we use one of:
> > > > - process_mfree()
> > > > - process_mrelease()
> > > >
> > >
> > > FWIW, I tend to like process_mrelease(), due to the implied "release" ("free
> > > the memory if there are no other references") semantics.
> >
> > Agreed.
> 
> Ok, sounds like process_mrelease() would be an acceptable compromise.
> 
> >
> > > Further, a new
> > > syscall feels cleaner than some magic sysfs/procfs toggle. Just my 2 cents.
> >
> > Yeah, proc based interface is both tricky to use and kinda ugly now that
> > pidfd can solve all at in once.
> 
> Sounds good. Will keep it as is then.
> 
> > My original preference was a more generic kill syscall to allow flags
> > but a dedicated syscall doesn't look really bad either.
> 
> Yeah, I have tried that direction unsuccessfully before arriving at
> this one. Hopefully it represents the right compromise which can
> satisfy everyone's usecase.

I think a syscall is fine and it's not we're running out of numbers
(anymore). :)

Christian