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SubjectRe: fork()
you can limit the max number of processes by putting the following into /etc/security/limits.conf (on my distro, and quite a number of others according to google too)

* hard nproc <max # processes>

you can also limit quite a number of other things in this file, and other files in that directory.

redoubtable wrote:
> Hey,
>
> I read a document on securityfocus about fork bombinb a linux system.
> Although they didn't speak about the effectiveness of resource limits I
> guess that should be discussed because it's possible to make a linux
> machine extremely slow (compared to FreeBSD for instance) even with well
> configured resource limits.
> I revised kernel/fork.c and I found a way to prevent this problem by
> removing all associated processes with the parent, but that's far from
> portable and should not be used for the sake of compatibilities. I guess
> the function fork() should be revised.
> And what about creating a 'maxprocs' sysctl var (even if left high) when
> the resource limits problem is fixed? It would help security when it is
> needed and wouldn't bother other applications. RLIMITs on login are not
> trustworthy. It should exist a global limit in case someone could spawn
> a shell without limits through some flawed application.
>
> Thanks, and please advise.
>
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