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    SubjectRe: [PATCH v3] vfs: new O_NODE open flag
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    On Sat, 05 Dec 2009, Andy Lutomirski wrote:
    > I don't know what that means. Do you mean that if:
    >
    > root creates /dev/foo with 0666 perms
    > eviluser opens /dev/foo with O_NODE

    More precisely, O_NODE | O_NOACCESS

    > root chmods /dev/foo to 0000
    > root unlinks /dev/foo
    >
    > then eviluser can't open /proc/self/fd/whatever for O_RDRW

    Yes.

    Maybe alan was worried about the O_NODE | O_RDWR, etc. case? That
    simply doesn't make any sense for special files.

    Current patch only allows O_NOACCESS for any file type, but other
    access modes may make sense for regular files, directories, and maybe
    even symlinks.

    Thanks,
    Miklos


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