86f33b5fcf
This will allow elfctl on older releases to set bits that are not yet known there, so that the binary will have the correct settings applied if run on a later FreeBSD version. PR: 252629 (related) Suggested by: kib Reviewed by: gbe (manpage, earlier), kib MFC after: 3 days Sponsored by: The FreeBSD Foundation Differential Revision: https://reviews.freebsd.org/D28284
110 lines
3.0 KiB
Groff
110 lines
3.0 KiB
Groff
.\" Copyright 2019 The FreeBSD Foundation.
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.\"
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.\" This software was developed by Bora Ozarslan under sponsorship from
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.\" the FreeBSD Foundation.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS''
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.\" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" $FreeBSD$
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.\"
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.Dd January 22, 2021
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.Dt ELFCTL 1
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.Os
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.Sh NAME
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.Nm elfctl
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.Nd change an ELF binary's feature control note
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.Sh SYNOPSIS
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.Nm
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.Op Fl h | Fl -help
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.Op Fl i
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.Op Fl l
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.Op Fl e Ar featurelist
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.Ar
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.Sh DESCRIPTION
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The
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.Nm
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utility modifies feature flags in the feature control note in an ELF binary.
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.Pp
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The options are as follows:
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.Bl -tag -width indent
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.It Fl h | Fl -help
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Print a usage message and exit.
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.It Fl i
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Ignore unknown feature flags in
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.Ar featurelist .
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.It Fl l
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List known ELF feature flags.
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.It Fl e Ar featurelist
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Edit features from the given comma separated list
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.Ar featurelist .
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.Ar featurelist
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starts with one of the three operations:
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.Dq Li +
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to turn on the features,
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.Dq Li -
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to turn off the features,
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.Dq Li =
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to only turn on the given features.
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A comma separated list of feature names or numeric values follows the
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operation.
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.El
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.Pp
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If
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.Fl e
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is not specified
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.Nm
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displays the status of each feature in the ELF note in each
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.Ar .
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.Sh EXIT STATUS
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Exit status is 0 on success, and 1 if the command
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fails if a file does not exist, is too short,
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or fails to find or edit features note.
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.Sh EXAMPLES
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The following is an example of a typical usage
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of the
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.Nm
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command:
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.Bd -literal -offset indent
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elfctl file
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elfctl -e +aslr file
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.Ed
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.Pp
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Features may be specified as numerical values:
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.Bd -literal -offset -indent
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elfctl -e =0x0001,0x0004 file
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.Ed
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.Pp
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Features may also be specified as a single combined value:
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.Bd -literal -offset -indent
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elfctl -e =0x5 file
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.Ed
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.Sh HISTORY
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.Nm
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first appeared in
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.Fx 12.2 .
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.Sh AUTHORS
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.Nm
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was written by
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.An Bora Ozarslan Mt borako.ozarslan@gmail.com
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under sponsorship from the
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.Fx Foundation.
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