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    SubjectRe: [PATCH v2 0/4] PR_SET_NO_NEW_PRIVS, unshare, and chroot
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    On Sun, 2012-01-15 at 16:37 -0800, Andy Lutomirski wrote:
    > To make the no_new_privs discussion more concrete, here is an updated
    > series that is actually useful. It adds PR_SET_NO_NEW_PRIVS

    I think it'd be clearer to call it PR_SET_NOSUID - basically it should
    match the semantics for MS_NOSUID mounts, as if on every exec()
    thereafter the target binary was on a nosuid filesystem.

    You might then change this flag to only take effect on a later exec(),
    which would solve your race condition for the hypothetical PAM module.

    > with the
    > same semantics as before (plus John Johansen's AppArmor fix and with
    > improved bisectability). It then allows some unshare flags

    What's the rationale behind the unshare subset? Did you actually
    analyze any setuid binaries found on Debian/Fedora etc. and determined
    that e.g. CLONE_NEWNET was problematic for some reason?

    I actually want CLONE_NEWNET for my build tool, so I can be sure the
    arbitrary code I'm executing as part of the build at least isn't
    downloading more new code.




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