linux-kernel - Re: counting file descriptors with a cgroup controller

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: <9a57890c-d9e9-5719-e155-ce1161795a02@samsung.com>
Date:   Fri, 17 Feb 2017 12:37:11 +0100
From:   Krzysztof Opasiak <k.opasiak@...sung.com>
To:     tj@...nel.org, lizefan@...wei.com, hannes@...xchg.org
Cc:     Łukasz Stelmach <l.stelmach@...sung.com>,
        linux-kernel@...r.kernel.org,
        Karol Lewandowski <k.lewandowsk@...sung.com>,
        cgroups@...r.kernel.org
Subject: Re: counting file descriptors with a cgroup controller

+ cgroups mailing list
+ cgroup maintainers

On 02/17/2017 10:37 AM, Łukasz Stelmach wrote:
> Hi,
> 
> We need to limit and monitor the number of file descriptors processes
> keep open. If a process exceeds certain limit we'd like to terminate it
> and restart it or reboot the whole system. Currently the RLIMIT API
> allows limiting the number of file descriptors but to achieve our goals
> we'd need to make sure all programmes we run handle EMFILE errno
> properly. That is why we consider developing a cgroup controller that
> limits the number of open file descriptors of its members (similar to
>  memory controler).
> 
> Any comments? Is there any alternative that:
> 
> + does not require modifications of user-land code,
> + enables other process (e.g. init) to be notified and apply policy.
> 
> Kind regards,
> 

-- 
Krzysztof Opasiak
Samsung R&D Institute Poland
Samsung Electronics