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29 Mar 2019 12:30:30 +0000 Received: from moss-pluto.infosec.tycho.ncsc.mil (moss-pluto [192.168.25.131]) by tarius.tycho.ncsc.mil (8.14.4/8.14.4) with ESMTP id x2TCUS6Z008999; Fri, 29 Mar 2019 08:30:29 -0400 Subject: Re: Should mprotect(..., PROT_EXEC) be checked by IMA? To: Mimi Zohar , Igor Zhbanov , Matthew Garrett , Kees Cook , Casey Schaufler , Paul Moore , John Johansen Cc: linux-integrity , Jann Horn , linux-security-module References: <1552945715.8658.299.camel@linux.ibm.com> <452752df-98f9-c361-878a-5df84ab36847@omprussia.ru> <1552994559.4899.26.camel@linux.ibm.com> <84145490-6f70-214f-8241-42d556590240@omprussia.ru> <1553015134.4899.82.camel@linux.ibm.com> <1553167318.4899.382.camel@linux.ibm.com> <07347317-ee71-83c1-384a-0c3439980af7@omprussia.ru> <1553793463.8711.26.camel@linux.ibm.com> <92718382-8669-748f-10d8-02fa21225210@omprussia.ru> <1553857187.9420.49.camel@linux.ibm.com> From: Stephen Smalley Message-ID: Date: Fri, 29 Mar 2019 08:28:36 -0400 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.6.0 MIME-Version: 1.0 In-Reply-To: <1553857187.9420.49.camel@linux.ibm.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 8bit Sender: owner-linux-security-module@vger.kernel.org Precedence: bulk List-ID: On 3/29/19 6:59 AM, Mimi Zohar wrote: > [Cc'ing the LSM mailing list and others] > > On Fri, 2019-03-29 at 13:00 +0300, Igor Zhbanov wrote: >> Hi Mimi,On 28.03.2019 20:17, Mimi Zohar wrote: > >>> I just came across the grsecurity article on mprotect.[1] >>> Has anyone looked at it? Would it make sense to make it a minor LSM? >>> >>> [1]https://pax.grsecurity.net/docs/mprotect.txt >> >> Interesting article. It is almost exactly of what I wanted to be implemented. >> >> If this minor LSM would be stackable to allow combining with e.g. SELinux >> then why not. > > Stacking shouldn't be a problem.  Other LSMs are already on the > mprotect hook.  Let's hear what others think. SELinux already provides a set of controls over executable mappings; see selinux_mmap_file and selinux_file_mprotect. Other major security modules may do likewise but I can't speak to that. Is there some gap you are trying to address that isn't already covered, or are you just trying to provide such restrictions without requiring one of the major modules?