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<H1>[Mageia-dev] forkbomb protection</H1>
<B>David W. Hodgins</B>
<A HREF="mailto:mageia-dev%40mageia.org?Subject=Re%3A%20%5BMageia-dev%5D%20forkbomb%20protection&In-Reply-To=%3Cop.wohz5vv1n7mcit%40hodgins.homeip.net%3E"
TITLE="[Mageia-dev] forkbomb protection">davidwhodgins at gmail.com
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<I>Wed Nov 28 20:23:45 CET 2012</I>
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<PRE>On Wed, 28 Nov 2012 13:00:05 -0500, Johnny A. Solbu <<A HREF="https://www.mageia.org/mailman/listinfo/mageia-dev">cooker at solbu.net</A>> wrote:
><i> On Wednesday 28. November 2012 17.53, David Walser wrote:
</I>>><i> Their pam package has a /etc/security/limits.d/90-nproc.conf file that has:
</I>><i>
</I>>><i> * soft nproc 1024
</I>>><i>
</I>>><i> As the last comment on the bug says, it's a bit confusing that it's in limits.d/ and not the limits.conf file itself,
</I>><i>
</I>><i> His point is that any limits set in «/etc/security/limits.d/» overrides the «limits.conf» file.
</I>><i>
</I>>><i> and in fact I'm not sure what is responsible for processing limits.d/* as limits.conf says nothing about it (Fedora's is the exact same as ours).
</I>><i>
</I>><i> We should add some comments in «/etc/security/limits.conf» about it.
</I>><i>
</I>>><i> Anyway, one way or another it would be nice to have this limit set by default on Mageia, IMHO. WDYT?
</I>><i>
</I>><i> I think we should have this.
</I>
This is also being discussed in the usenet newsgroup alt.os.linux.mageia.
I've confirmed the forkbomb will kill my Mageia 2 x86-64 system, with
the default value for nprocs of 127910. Interestingly, it doesn't kill
the system if I run the forkbomb right after rebooting, only if it's been
in use for a while. This is a quad core with 16GB of ram.
I've added a line to /etc/security/limits.conf on my system, with
* hard nproc 10000
The forkbomb no longer has impact, except for the need to kill all
of the user's bash processes.
# ps -A|wc -l
218
I think 10000 should be more than adequate, yet low enough to stop the
bomb from killing the system.
Regards, Dave Hodgins
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