Date: Fri, 29 Jun 2001 10:20:03 -0700 (PDT) From: David Malone <dwmalone@maths.tcd.ie> To: freebsd-bugs@FreeBSD.org Subject: Re: misc/28522: The ability to crash any freebsd box with 8 lines of shell script Message-ID: <200106291720.f5THK3C06110@freefall.freebsd.org>
next in thread | raw e-mail | index | archive | help
The following reply was made to PR misc/28522; it has been noted by GNATS. From: David Malone <dwmalone@maths.tcd.ie> To: Peter Pentchev <roam@orbitel.bg> Cc: freebsd-gnats-submit@FreeBSD.org Subject: Re: misc/28522: The ability to crash any freebsd box with 8 lines of shell script Date: Fri, 29 Jun 2001 18:13:50 +0100 > But is it really ineffective? Just five instances of 'cat' would > consume quite a lot of kernel resources (fake read, fake write, two > syscalls, data copies to userspace and back...). If you allow you users to use resources of any sort then they can use them - you can't get around that. Some people have done things with fancy schedulers which split CPU time between uids as opposed to between processes - this might be of some help. (Mind you, you can do far worse in terms of making the system unresponisve than running 5 processes by just using 1 process and a few standard shell commands, and that's just what I can think of off the top of my head.) David. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-bugs" in the body of the message
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?200106291720.f5THK3C06110>