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[108.15.23.247]) by smtp.gmail.com with ESMTPSA id l25sm7252405qkk.115.2020.02.16.07.34.47 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Sun, 16 Feb 2020 07:34:47 -0800 (PST) Subject: Re: memlockd To: russell@coker.com.au, "selinux-refpolicy@vger.kernel.org" References: <1920940.Lkz1Kncxd7@xev> From: Chris PeBenito Message-ID: <109b4ae6-a8b4-7bc8-8a20-8edfc838ac2f@ieee.org> Date: Sun, 16 Feb 2020 10:30:13 -0500 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.3.1 MIME-Version: 1.0 In-Reply-To: <1920940.Lkz1Kncxd7@xev> Content-Type: text/plain; charset=windows-1252; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit Sender: selinux-refpolicy-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: selinux-refpolicy@vger.kernel.org On 2/11/20 10:34 PM, Russell Coker wrote: > The attach patch adds policy for memlockd, this is a daemon that locks > important programs and config files into RAM so that if the system is paging > heavily the sysadmin still has a good chance of being able to login to > diagnose problems. Please inline patch and add signed-off-by. > --- /dev/null > +++ refpolicy-2.20200209/policy/modules/services/memlockd.te > @@ -0,0 +1,42 @@ > +policy_module(memlockd, 1.0.0) > + > +######################################## > +# > +# Declarations > +# > + > +type memlockd_t; > +type memlockd_exec_t; > +init_daemon_domain(memlockd_t, memlockd_exec_t) > + > +######################################## > +# > +# Local policy > +# > + > +allow memlockd_t self:capability { setgid setuid ipc_lock }; > +allow memlockd_t self:fifo_file rw_file_perms; > +allow memlockd_t self:unix_dgram_socket { create connect }; > + > +# cache /etc/shadow too > +auth_read_shadow(memlockd_t) > +auth_map_shadow(memlockd_t) > + > +sysnet_map_config(memlockd_t) > +files_read_etc_files(memlockd_t) > + > +# for ldd > +corecmd_exec_bin(memlockd_t) > +corecmd_exec_shell(memlockd_t) > + > +libs_exec_ld_so(memlockd_t) > + > +corecmd_search_bin(memlockd_t) > +files_map_etc_files(memlockd_t) > +# has to exec for ldd > +corecmd_exec_all_executables(memlockd_t) I would guess this is doing mmap_exec but not execute_no_trans. > +corecmd_read_all_executables(memlockd_t) > + > +logging_send_syslog_msg(memlockd_t) > + > +miscfiles_read_localization(memlockd_t) > + > Index: refpolicy-2.20200209/policy/modules/system/sysnetwork.if > =================================================================== > --- refpolicy-2.20200209.orig/policy/modules/system/sysnetwork.if > +++ refpolicy-2.20200209/policy/modules/system/sysnetwork.if > @@ -366,6 +366,31 @@ interface(`sysnet_read_config',` > > ####################################### > ## > +## map network config files. > +## > +## > +##

> +## Allow the specified domain to mmap the > +## general network configuration files. > +##

> +## > +## > +## > +## Domain allowed access. > +## > +## > +# > +interface(`sysnet_map_config',` Please change name to sysnet_mmap_read_config(). > + gen_require(` > + type net_conf_t; > + ') > + > + files_search_etc($1) > + allow $1 net_conf_t:file { read_file_perms map }; > +') > + -- Chris PeBenito