[systemd-devel] /run DoS

[Michał Piotrowski]

W dniu 3 kwietnia 2011 12:54 użytkownik Lennart Poettering
<mzerqung at 0pointer.de> napisał:
> On Sun, 03.04.11 13:10, Michał Piotrowski (mkkp4x4 at gmail.com) wrote:
>
>> Hi,
>>
>> I can write to /run/user/michal in this way I can fill the entire free
>> tmpfs space which is not good from my POV.
>
> Yupp, this is trivially fixable by placing another tmpfs on /run/user,
> which can be done by installing a run-user.mount unit.
>
> We considered doing so by default, but stepped back a little, since we
> didn't want to add another tmpfs to the mix, just like that. But yeah,
> we probably should do that.

I see no other way out here because tmpfs does not support quota.

BTW. There still be a possibility to deadlock machine if you have a
not limited /tmp on tmpfs. By default tmpfs can use a half of system
memory size, so if you got a two user writable tmpfs file systems you
can try to deadlock system.

>
> Lennart
>
> --
> Lennart Poettering - Red Hat, Inc.
>



-- 
Best regards,
Michal

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