kern.randompid sysctl value

[Jordi Espasa Clofent]

HI,

1. ¿What's the real value (in terms of security) of the random PIDs feature?

According to this book

http://books.google.es/books?id=gqKwaHmXp4YC&pg=PA50&lpg=PA50&dq=random+pids+security&source=bl&ots=jimAeOQK2Q&sig=WrsBiMAxU-lUCM3pdCjtIYfmiIo&hl=es&ei=OwVoS4nwGMeOjAek5ZCvCQ&sa=X&oi=book_result&ct=result&resnum=9&ved=0CCsQ6AEwCA#v=onepage&q=random%20pids%20security&f=false

I understand that the random PIDs wil be a good security measure against 
some exploits (books says "race conditions"). OpenBSD folks (focused on 
security) have the random PIDs by defaul, so

¿why Freebsd don't use it by default?

2. ¿What will be a real secure value for sysctl parameter? I mean 
'kern.randompid' isn't a boolean, but a large number which determines 
the numeric range to generate de random PIDs. ¿1000, 10000, 100000?

Thanks in advance for aclarations.

PD. I've real this old post 
http://marc.info/?l=freebsd-security&m=99495048923300&w=2. Interesting.

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