Date: Ος, 10 VII 1999 11:20:15 +0200 (EEDT) From: core-ix@hushmail.com To: freebsd-arch@FreeBSD.ORG Cc: freebsd-hackers@FreeBSD.ORG Subject: Some proposals to FreeBSD kernel Message-ID: <200007100823.BAA07998@mail3.hushmail.com>
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Hello
I'm 18-year-old newbie UNIX programmer that currently use
FreeBSD and is really thankfull of it.I run it on DUAL PII/333.
Some days ago my friend tell me that with simple user rights
and whit only 1 line of code he could crash my machine. I laught
but he did it :(.
What he wrote was ' int main(void) {while(1) fork(); }' compiled it
and run it. Within a second /kernel said "proc: table is full" and
died. I tried this on some other BSD unixes and the result was
same. (BTW Minix 2.0 seem unaffected and probably other SVR4
variants, because you can limit the number of system processes
and system still have resources to work fine(although slow))
With sysctl() I found that my system can work with up to 532 procs
simulanteously, but didnt found where this value is set in the src/
or probably where it is computed.
So I sit down and wrote a static library that introduse a new fork()
(nfork()) and _exit() (nexit()) whose only purpose is to lower the
effect ot fast fork()s by sleeping accordingly to the number of times
fork() was called.I tend to make some more things with that piece
of code (in the attachment) and probably to add it to the kenel src
but for now it is easier to use it as a library.
Any suggestions about tarball included are welcome.
Looking forward to hearing from you.
Thanks for reading my letter Ix
P.S. Please excuse my amateur code (I'm only 18-year-old :) )
And the file attached is named sys2-src.tar.gz but my mail have
some problems with that names so it may apear as sys2-src.tar.gz.gz
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