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    SubjectRe: capabilities in elf headers, (my) final (and shortest) iteration
    Pavel Machek <> said:


    > [Take a look at way how scripts are executed. When script
    > 'script.xyzzy' beggining with
    > #!/foo/bar
    > is executed, kernel executes /foo/bar script.xyzzy. There's a race
    > here - user can easily delete and replace script.xyzzy in between.]

    Yes. The secure way to do this (AFAIKR) is for the kernel to open the
    script (f.ex. filedescriptor 3 all the time, it has it open anyway to make
    the check) and run "/foo/bar /proc/<pid>/fd/3" instead. Or get the
    interpreter to read the script from fd 3 always. No race.
    Horst von Brand
    Casilla 9G, Viña del Mar, Chile +56 32 672616

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