Messages in this thread | | | Subject | Re: Linux 2.2.18pre21 | Date | Sat, 18 Nov 2000 11:07:56 +0100 (MET) | From | (Rogier Wolff) |
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Alan Cox wrote: > > It's simply not good enough to close all directory file descriptors before chrooting. > > > > If calling chroot once you're already in a chroot jail was disallowed, it would stop > > this attack.
> I think the problem here is that some people have the idea that > chroot is some kind of magical security device. Thats not true at > all. You can build an environment like that if you wish by closing > other directory handles and having no suitably priviledged code in > the chroot area and stuff.
I read about the BSD Jail stuff a while ago.
It's a nice "operating system class lab project". Estimated time needed: 40 hours.
This IS the magical security device.
Roger. -- ** R.E.Wolff@BitWizard.nl ** http://www.BitWizard.nl/ ** +31-15-2137555 ** *-- BitWizard writes Linux device drivers for any device you may have! --* * Common sense is the collection of * ****** prejudices acquired by age eighteen. -- Albert Einstein ******** - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org Please read the FAQ at http://www.tux.org/lkml/
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