121 lines
3.3 KiB
Groff
121 lines
3.3 KiB
Groff
.\" $NetBSD: paxctl.8,v 1.22 2023/08/21 00:41:49 dholland Exp $
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.\"
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.\" Copyright 2006 Elad Efrat <elad@NetBSD.org>
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.\" Copyright 2008 Christos Zoulas <christos@NetBSD.org>
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.\" All rights reserved.
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.\"
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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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.\" 3. The name of the author may not be used to endorse or promote products
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.\" derived from this software without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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.\" IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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.\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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.\"
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.Dd August 20, 2023
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.Dt PAXCTL 8
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.Os
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.Sh NAME
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.Nm paxctl
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.Nd list and modify PaX flags associated with an ELF program
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.Sh SYNOPSIS
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.Nm
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.Op Fl 0 | Ar flags
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.Ar program ...
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.Sh DESCRIPTION
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The
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.Nm
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utility is used to list and manipulate PaX flags associated with an ELF
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program.
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The PaX flags signify to the loader the privilege protections to be applied
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to mapped memory pages, and fuller explanations of the specific protections
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can be found in the
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.Xr security 7
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manpage.
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.Pp
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To view existing flags on a
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.Ar program ,
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execute
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.Nm
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without any flags.
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.Pp
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If
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.Fl 0
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option is specified, all PaX flags
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.Pq including reserved bits
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are cleared.
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Otherwise, each flag can be prefixed either with a
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.Sq Cm +
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or a
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.Sq Fl
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sign to add or remove the flag, respectively.
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.Pp
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The following flags are available:
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.Pp
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.Bl -tag -width Ds -compact
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.It Cm a
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Explicitly disable PaX ASLR (Address Space Layout Randomization).
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.It Cm A
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Explicitly enable PaX ASLR.
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.Pp
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.It Cm g
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Explicitly disable PaX Segvguard.
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.It Cm G
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Explicitly enable PaX Segvguard.
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.Pp
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.It Cm m
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Explicitly disable PaX MPROTECT
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.Po Xr mprotect 2
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restrictions
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.Pc .
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.It Cm M
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Explicitly enable PaX MPROTECT.
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.El
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.
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.Sh SEE ALSO
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.Xr mprotect 2 ,
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.Xr sysctl 3 ,
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.Xr options 4 ,
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.Xr elf 5 ,
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.Xr security 7 ,
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.Xr sysctl 8 ,
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.Xr fileassoc 9
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.Sh HISTORY
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The
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.Nm
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utility first appeared in
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.Nx 4.0 .
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.Pp
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The
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.Nm
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utility is modeled after a tool of the same name available for Linux from the
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PaX project.
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.Sh AUTHORS
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.An Elad Efrat Aq Mt elad@NetBSD.org
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.An Christos Zoulas Aq Mt christos@NetBSD.org
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.Sh RESTRICTIONS
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The
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.Nm
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utility uses
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.Xr elf 5
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note sections to mark executables with PaX flags.
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This means that, as one might expect, the PaX settings do not persist
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if the program file is replaced.
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It also means that running
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.Nm
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changes the target executable, which can be undesirable in production.
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In general,
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.Nm
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settings should be applied to programs at build time.
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