1.\" $NetBSD: paxctl.8,v 1.16 2016/11/08 08:21:52 wiz Exp $ 2.\" 3.\" Copyright 2006 Elad Efrat <elad@NetBSD.org> 4.\" Copyright 2008 Christos Zoulas <christos@NetBSD.org> 5.\" All rights reserved. 6.\" 7.\" 1. Redistributions of source code must retain the above copyright 8.\" notice, this list of conditions and the following disclaimer. 9.\" 2. Redistributions in binary form must reproduce the above copyright 10.\" notice, this list of conditions and the following disclaimer in the 11.\" documentation and/or other materials provided with the distribution. 12.\" 3. The name of the author may not be used to endorse or promote products 13.\" derived from this software without specific prior written permission. 14.\" 15.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 16.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 17.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 18.\" IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 19.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 20.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 21.\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 22.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 23.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 24.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 25.\" 26.Dd November 7, 2016 27.Dt PAXCTL 8 28.Os 29.Sh NAME 30.Nm paxctl 31.Nd list and modify PaX flags associated with an ELF program 32.Sh SYNOPSIS 33.Nm 34.Ar flags 35.Ar program ... 36.Sh DESCRIPTION 37The 38.Nm 39utility is used to list and manipulate PaX flags associated with an ELF 40program. 41The PaX flags signify to the loader the privilege protections to be applied 42to mapped memory pages, and fuller explanations of the specific protections 43can be found in the 44.Xr security 7 45manpage. 46.Pp 47Each flag can be prefixed either with a 48.Dq + 49or a 50.Dq - 51sign to add or remove the flag, respectively. 52.Pp 53The following flags are available: 54.Bl -tag -width flag 55.It a 56Explicitly disable PaX ASLR (Address Space Layout Randomization) for 57.Ar program . 58.It A 59Explicitly enable PaX ASLR for 60.Ar program . 61.It g 62Explicitly disable PaX Segvguard for 63.Ar program . 64.It G 65Explicitly enable PaX Segvguard for 66.Ar program . 67.It m 68Explicitly disable PaX MPROTECT 69.Po Xr mprotect 2 70restrictions 71.Pc 72for 73.Ar program . 74.It M 75Explicitly enable PaX MPROTECT 76.Po Xr mprotect 2 77restrictions 78.Pc 79for 80.Ar program . 81.El 82.Pp 83To view existing flags on a file, execute 84.Nm 85without any flags. 86.Sh SEE ALSO 87.Xr mprotect 2 , 88.Xr sysctl 3 , 89.Xr options 4 , 90.Xr elf 5 , 91.Xr security 7 , 92.Xr sysctl 8 , 93.Xr fileassoc 9 94.Sh HISTORY 95The 96.Nm 97utility first appeared in 98.Nx 4.0 . 99.Pp 100The 101.Nm 102utility is modeled after a tool of the same name available for Linux from the 103PaX project. 104.Sh AUTHORS 105.An Elad Efrat Aq Mt elad@NetBSD.org 106.An Christos Zoulas Aq Mt christos@NetBSD.org 107.Sh BUGS 108The 109.Nm 110utility currently uses 111.Xr elf 5 112.Dq note 113sections to mark executables as having PaX flags enabled. 114This will be done using 115.Xr fileassoc 9 116in the future so that we can control who does the marking and 117not altering the binary file signature. 118(Note this also means that 119at present any flags set do not survive binary file upgrades.) 120