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Bugtraq archives for 4th quarter (Oct-Dec) 1995: Re: fork()

Re: fork()

Ed Arnold (eraucar.edu)
Mon, 11 Dec 1995 11:29:52 -0700 

Alex Leipold <aleipoldclark.net> wrote:

> O'm new to the list, so Im not sure if this has been covered, but someone
> can crash any system with a few lines of code. (tested on UNIX, LINUX)
>
> main() {
> int x;
> while(x=0;x<1000000;x++)
> {
> system("uptime");
> fork();
> }
> }
>
> Gcc it, run it and whatever system your on will crash. Is their any way
> to stop users from doing this? I.e. restricting number of process that
> can run?

On SunOS, edit param.c and set MAXUPRC considerably lower than NPROC.
Keeps the pigs at bay.

I assume Solaris allows a similar thing but I don't know the details.
Who does?