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https://github.com/freebsd/freebsd-src.git
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Alexander Ziaee
ff2bc64159
Fix compiler warnings related to the Fx macro, as well as all other mechanical typos that were visible within one screenful of them. These cause rendering glitches on various toolchains with various of the five and a half decades of rich output formats and tooling manpages scale to. The *x macro set specifies operating systems. These macros take the rest of the line as an argument. Sometimes, a space was not used to separate the argument of Fx and the trailing period. Another, FreeBSD Foundation was misrepresented as an operating system version instead of an author. Two more had other parts of the sentence supplied as an argument to Fx. While I had those open, fix the other mechancial typos visible on those specific screenfulls. Fix a list width glitch, correct section typo AUTHOR to AUTHORS, and switch AUTHORS sections containing prose to prose-mode so that they wrap freely when rendered. PR: 297248 MFC after: 3 days Fixes:d39e310c7d("man/man3: add stdbit.3") Fixes:d790b16bbf("add man pages for stdbit functions") Fixes:b61850c4e6("net.link.bridge.member_ifaddrs to false") Reported by: wosch (groff is complaining about incorrect Fx usage)
125 lines
3.4 KiB
Groff
125 lines
3.4 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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.Dd October 5, 2023
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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 +noaslr 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 NOTES
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On amd64, on a machine with LA57 (5-level paging) mode supported and
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enabled, if both
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.Va la57
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and
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.Va la48
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feature flags are specified, the
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.Va la57
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feature has priority over
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.Va la48 .
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The
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.Va vm.pmap.prefer_uva_la48
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sysctl MIB defines the default user address space size for binaries
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which do not set either of these flags.
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.Sh SEE ALSO
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.Xr mitigations 7
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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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.An -nosplit
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.Nm
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was written by
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.An Bora Ozarslan Aq Mt [email protected]
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under sponsorship from the
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.An FreeBSD Foundation .
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