1.\" Copyright 2019 The FreeBSD Foundation. 2.\" 3.\" This software was developed by Bora Ozarslan under sponsorship from 4.\" the FreeBSD Foundation. 5.\" 6.\" Redistribution and use in source and binary forms, with or without 7.\" modification, are permitted provided that the following conditions 8.\" are met: 9.\" 1. Redistributions of source code must retain the above copyright 10.\" notice, this list of conditions and the following disclaimer. 11.\" 2. Redistributions in binary form must reproduce the above copyright 12.\" notice, this list of conditions and the following disclaimer in the 13.\" documentation and/or other materials provided with the distribution. 14.\" 15.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' 16.\" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 17.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 18.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 19.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 20.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 21.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 22.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 23.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 25.\" SUCH DAMAGE. 26.\" 27.\" $FreeBSD$ 28.\" 29.Dd March 1, 2020 30.Dt ELFCTL 1 31.Os 32.Sh NAME 33.Nm elfctl 34.Nd change an ELF binary's feature control note 35.Sh SYNOPSIS 36.Nm 37.Op Fl h | Fl -help 38.Op Fl l 39.Op Fl e Ar featurelist 40.Ar 41.Sh DESCRIPTION 42The 43.Nm 44utility modifies feature flags in the feature control note in an ELF binary. 45.Pp 46The options are as follows: 47.Bl -tag -width indent 48.It Fl h | Fl -help 49Print a usage message and exit. 50.It Fl l 51List known ELF feature flags. 52.It Fl e Ar featurelist 53Edit features from the given comma separated list 54.Ar featurelist . 55.Ar featurelist 56starts with one of the three operations: 57.Dq Li + 58to turn on the features, 59.Dq Li - 60to turn off the features, 61.Dq Li = 62to only turn on the given features. 63A comma separated list of feature names follows the operation. 64.El 65.Pp 66If 67.Fl e 68is not specified 69.Nm 70displays the status of each feature in the ELF note in each 71.Ar . 72.Sh EXIT STATUS 73Exit status is 0 on success, and 1 if the command 74fails if a file does not exist, is too short, 75or fails to find or edit features note. 76.Sh EXAMPLES 77The following is an example of a typical usage 78of the 79.Nm 80command: 81.Bd -literal -offset indent 82elfctl file 83elfctl -e +aslr file 84.Ed 85.Sh HISTORY 86.Nm 87first appeared in 88.Fx 12.2 . 89.Sh AUTHORS 90.Nm 91was written by 92.An Bora Ozarslan Mt borako.ozarslan@gmail.com 93under sponsorship from the 94.Fx Foundation. 95