Date: Fri, 9 Jun 2017 09:18:46 -0400 From: Matt Brown <matt@...tt.com> To: Mimi Zohar <zohar@...ux.vnet.ibm.com>, Kees Cook <keescook@...omium.org> Cc: James Morris <james.l.morris@...cle.com>, "Serge E. Hallyn" <serge@...lyn.com>, LKML <linux-kernel@...r.kernel.org>, linux-security-module <linux-security-module@...r.kernel.org>, "kernel-hardening@...ts.openwall.com" <kernel-hardening@...ts.openwall.com> Subject: Re: Re: [PATCH v2 1/1] Add Trusted Path Execution as a stackable LSM On 6/9/17 9:16 AM, Mimi Zohar wrote: > On Fri, 2017-06-09 at 05:55 -0700, Kees Cook wrote: >> On Fri, Jun 9, 2017 at 3:18 AM, Mimi Zohar <zohar@...ux.vnet.ibm.com> wrote: >>> On Thu, 2017-06-08 at 23:50 -0400, Matt Brown wrote: >>>>>> >>>>>> * Issues: >>>>>> * Can be bypassed by interpreted languages such as python. You can run >>>>>> malicious code by doing: python -c 'evil code' >>>>> >>>>> What's the recommendation for people interested in using TPE but >>>>> having interpreters installed? >>>>> >>>> >>>> If you don't need a given interpreter installed, uninstall it. While >>>> this is common sense system hardening it especially would make a >>>> difference under the TPE threat model. >>>> >>>> I don't have a knock down answer for this. Interpreters are a hard >>>> problem for TPE. >>> >>> You might be interested in the minor LSM named "shebang", that I >>> posted as a proof of concept back in January, which restricts the >>> python interactive prompt/interpreter, but allows the scripts >>> themselves to be executed. >> >> https://patchwork.kernel.org/patch/9547405/ >> >> Maybe these could be merged and the interpreter string could be made >> into a configurable list? > > I updated shebang, but didn't bother to post it, as nobody seemed to > be interested at the time. The updated version already has support > for the configurable list. Re-posting ... > That would be awesome. I think it's the perfect complement to TPE as it protects a key hole in its current threat model. Matt
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