limits of maxproc on SUN E450 with FreeBSD 5.3 Beta7

[DanGer]

Hello Doug,

Monday, October 18, 2004, 7:57:53 PM, you wrote:

> On Fri, 15 Oct 2004, Borghesi Guilhem wrote:

>> I've installed a FreeBSD 5.3 Beta7 on a Sun sparc64 Enterprise 450.
>> This machine is a Terminal and application server for University
>> students. They are using this server for system programming (C for
>> example) and they often use the command "fork ()" into "while" loops.

> We call that a "forkbomb."

>> This kind of bad programming is quite frequent at the university, and
>> that's the reason why I'm trying to limit the number of maxproc per
>> user. I've limited the maxproc with the /etc/login.conf file at 100 and
>> make a "cap_mkdb /etc/login.conf", but it doesn't work. Worst, when the

I'm not very sure about this, but, did you turned on in
/etc/ssh/sshd_config option UseLogin? like

UseLogin yes

>> number of processes reach the limit, the server crash with the console
>> message :"panic: trap: data access error".
>>
>> I've tried to put "unlimited" in place of "100", but it does'nt change
>> anything because the system has an implicit limit for users
>> (kern.maxprocperuid: 5547).

> It should change the soft limit on maxproc, and the kernel sysctl is the
> hard limit.  The user can change the limit up to the hard limit, but it
> will start out at the soft limit.

> What as the exact change you made to login.conf?  Did you test it after
> logging out and logging back in?  How were you logging in?

> Obviously, the panic isn't such a great thing. Did you get a crashdump?



-- 
Best regards

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