freebsd-dev/usr.bin/elfctl/elfctl.1
Ed Maste 4ac4a7f80b elfctl: update earliest FreeBSD revision to 12.2
elfctl has been merged to stable/12, and so will appear in FreeBSD 12.2

Reported by:	Dewayne Geraghty
MFC after:	1 week
Sponsored by:	The FreeBSD Foundation
2020-05-05 21:50:52 +00:00

95 lines
2.7 KiB
Groff

.\" Copyright 2019 The FreeBSD Foundation.
.\"
.\" This software was developed by Bora Ozarslan under sponsorship from
.\" the FreeBSD Foundation.
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
.\" are met:
.\" 1. Redistributions of source code must retain the above copyright
.\" notice, this list of conditions and the following disclaimer.
.\" 2. Redistributions in binary form must reproduce the above copyright
.\" notice, this list of conditions and the following disclaimer in the
.\" documentation and/or other materials provided with the distribution.
.\"
.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS''
.\" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
.\" SUCH DAMAGE.
.\"
.\" $FreeBSD$
.\"
.Dd March 1, 2020
.Dt ELFCTL 1
.Os
.Sh NAME
.Nm elfctl
.Nd change an ELF binary's feature control note
.Sh SYNOPSIS
.Nm
.Op Fl h | Fl -help
.Op Fl l
.Op Fl e Ar featurelist
.Ar
.Sh DESCRIPTION
The
.Nm
utility modifies feature flags in the feature control note in an ELF binary.
.Pp
The options are as follows:
.Bl -tag -width indent
.It Fl h | Fl -help
Print a usage message and exit.
.It Fl l
List known ELF feature flags.
.It Fl e Ar featurelist
Edit features from the given comma separated list
.Ar featurelist .
.Ar featurelist
starts with one of the three operations:
.Dq Li +
to turn on the features,
.Dq Li -
to turn off the features,
.Dq Li =
to only turn on the given features.
A comma separated list of feature names follows the operation.
.El
.Pp
If
.Fl e
is not specified
.Nm
displays the status of each feature in the ELF note in each
.Ar .
.Sh EXIT STATUS
Exit status is 0 on success, and 1 if the command
fails if a file does not exist, is too short,
or fails to find or edit features note.
.Sh EXAMPLES
The following is an example of a typical usage
of the
.Nm
command:
.Bd -literal -offset indent
elfctl file
elfctl -e +aslr file
.Ed
.Sh HISTORY
.Nm
first appeared in
.Fx 12.2 .
.Sh AUTHORS
.Nm
was written by
.An Bora Ozarslan Mt borako.ozarslan@gmail.com
under sponsorship from the
.Fx Foundation.