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    SubjectRe: FUSE merging?
    On Fri, Jul 01, 2005 at 08:36:02AM +0200, Miklos Szeredi wrote:
    >
    > Here's a description of a theoretical DoS scenario:
    >
    > http://marc.theaimsgroup.com/?l=linux-fsdevel&m=111522019516694&w=2

    So the open() hangs indefinately. but what if blackhat tries to install
    a package from a no longer existing server on /net or via NFS?

    A user supplied pathname is not to be trusted by any setuid (or full
    root) program.

    Another example: I'm not sure if there are still /dev/tty devices which
    may block indefinately upon open() but:

    - I have yet to see a setuid program which always uses O_NONBLOCK
    when opening user supplied pathnames.
    - one cannot stat() and then open() because that gives a race.

    --
    Frank
    -
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