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    Subjectchroot [Was: Re: Linux 2.2.18pre21]
    On Thu, Nov 16, 2000 at 11:52:49AM -0800, jesse wrote:
    > On Thu, Nov 16, 2000 at 05:16:18PM +0100, Andrea Arcangeli wrote:
    > > On Thu, Nov 16, 2000 at 03:07:04PM +0100, Matthias Andree wrote:
    > > > It shows a program that saves the cwd -- open(".",...) in an open file,
    > > > then chroots [..]
    > >
    > > This is known behaviour (I know Alan knows about it too), solution is to close
    > > open directories filedescriptors before chrooting.
    > >
    > > Everything that happens before chroot(2) is trusted, so it's secure to rely
    > > on it to close directories first.
    > >
    > > If this is not well documented and people doesn't know about it and so they
    > > writes unsafe code that's another issue...
    >
    > But the problem is because you can call chroot when you're already chrooted.

    Only if you're root. There are other ways to break out of a
    chroot() if you're root too.


    Kurt

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