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    SubjectRe: Compat 32-bit syscall entry from 64-bit task!? [was: Re: [RFC,PATCH 1/2] seccomp_filters: system call filtering using BPF]
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    On Tue, 2012-01-17 at 22:25 -0800, Linus Torvalds wrote:

    > Of course, limiting things so that you cannot map the same page
    > executably *and* writably is one solution - and a good idea regardless
    > - so secure environments can still exist. But even then you could have
    > races in a multi-threaded environment (they'd just be *much* harder to
    > trigger for an attacker).

    Gratuitous SELinux for the win e-mail! (Feel free to delete now) We
    typically, for all confined domains, do not allow mapping anonymous
    memory both W and X. Actually you can't even map it W and then map it
    X...

    Now if there is file which you have both W and X SELinux permissions
    (which is rare, but not impossible) you could map it in two places. So
    we can (and do) build SELinux sandboxes which address this.



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