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    SubjectRe: Capabilities done right [diff against 2.3.1]
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    Linus Torvalds wrote:
    >
    >
    > On Sun, 16 May 1999, Pavel Machek wrote:
    > >
    > > Only other executables are a.out (nobody uses them these days) and
    > > scripts. But take a look: we do not honour setuid bit on scripts,
    > > anyway!
    >
    > I know. But that's not a feature - it's a misfeature forced upon us by the
    > fact that "sh" was never very good at understanding security issues.
    >
    > Let's not use a misfeature as an argument against doing things right.

    So why don't we expand #! interpretation to support this right?

    How about the "API":

    #!0:/bin/sh -

    This opens the script on fd 0. (I'm not sure what a shell will do with
    "- /bin/somescript" as the arguments).

    That should eliminate the race between starting the shell (setuid) and
    it opening the script.

    Besides that sh still needs protection from IFS attacks, are there more
    issues?

    I agree that blindly adding API features is a bad idea. However here
    we have a chance of fixing something right that has been broken for
    years.

    Roger.

    --
    ** R.E.Wolff@BitWizard.nl ** http://www.BitWizard.nl/ ** +31-15-2137555 **
    *-- BitWizard writes Linux device drivers for any device you may have! --*
    ------ Microsoft SELLS you Windows, Linux GIVES you the whole house ------


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