linux-kernel - Re: [PATCH v5 5/6] clone3: allow spawning processes into cgroups

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]

Date:   Tue, 4 Feb 2020 12:13:07 +0100
From:   Christian Brauner <christian.brauner@...ntu.com>
To:     Michal Koutný <mkoutny@...e.com>
Cc:     linux-api@...r.kernel.org, linux-kernel@...r.kernel.org,
        Tejun Heo <tj@...nel.org>, Oleg Nesterov <oleg@...hat.com>,
        Ingo Molnar <mingo@...hat.com>,
        Johannes Weiner <hannes@...xchg.org>,
        Li Zefan <lizefan@...wei.com>,
        Peter Zijlstra <peterz@...radead.org>, cgroups@...r.kernel.org
Subject: Re: [PATCH v5 5/6] clone3: allow spawning processes into cgroups

On Mon, Feb 03, 2020 at 03:32:28PM +0100, Michal Koutný wrote:
> On Sun, Feb 02, 2020 at 10:37:02AM +0100, Christian Brauner <christian.brauner@...ntu.com> wrote:
> > cgroup_post_fork() is called past the point of no return for fork and
> > cgroup_css_set_put_fork() is explicitly documented as only being
> > callable before forks point of no return:
> I missed this and somehow incorrectly assumed it's called at the end of
> fork too. I find the css_set refcounting correct now.
> 
> BTW any reason why not to utilize cgroup_css_set_put_fork() for the
> regular cleanup in cgroup_post_fork() too?

Hmyeah, should be doable if we do:
kargs->cset = NULL;
cgroup_css_set_put_fork(kargs);

Christian