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Adrian Schröter 2024-09-06 15:26:59 +02:00
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## Default LFS
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GNU GENERAL PUBLIC LICENSE
Version 2, June 1991
Copyright (C) 1989, 1991 Free Software Foundation, Inc.,
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#!/bin/bash
rm -f /var/cache/livepatch/*
for module in /sys/kernel/livepatch/*; do
/usr/bin/klp store_patch_info "${module#/sys/kernel/livepatch/}"
done
# vim: ai sw=4 et sts=4 ft=sh

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#!/bin/bash
type getarg >/dev/null 2>&1 || . /lib/dracut-lib.sh
if getargbool 1 klp; then
modules=($(find "/lib/modules/$(uname -r)/livepatch" -type f | \
sed -rn 's:.*/(livepatch[^/]*)\.ko(\.[gx]z|\.zst)?$:\1:p'))
if test ${#modules[@]} -gt 0; then
for mod in "${modules[@]}"; do
info "[klp] Loading $mod"
modprobe "${mod##*/}"
done
else
info "[klp] No patches found"
fi
else
info "[klp] Disabled on kernel commandline, not loading any patches"
fi

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#!/bin/bash
check()
{
test -d "$srcmods/livepatch"
}
install()
{
inst_hook pre-pivot 99 "$moddir/kernel-livepatch.sh"
inst_binary find
}
installkernel()
{
# Cannot use instmods =livepatch, because this syntax only
# works for subdirectories of subdirectories of $srcmods
find "$srcmods/livepatch" -type f -regex '.*\.ko\(\.[gx]z\|\.zst\)?$' -printf '%P\n' | \
hostonly='' instmods
}

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%define _this_kmp_name %{-n*}-%(echo %2 | sed -r 'y/\./_/')
%package -n %_this_kmp_name
Release: %{-r*}
Summary: %summary
Group: %group
Supplements: packageand(%3:kernel-livepatch-tools)
Requires: coreutils grep
Requires: %3
Requires(post): kernel-livepatch-tools >= 1.2
Requires(postun): kernel-livepatch-tools >= 1.2
%description -n %_this_kmp_name
%(
for spec in {%_sourcedir,%_specdir}/%name.spec /dev/null; do
[ -e $spec ] && break
done
awk '
/^%%/ { in_desc = \
($0 ~ /^%%description[ \t]*$/ ||
$0 ~ /^%%description[ \t]+-n[ \t]*%name[ \t]*$/)
next }
in_desc { print }
' $spec
)
%pre -n %_this_kmp_name
nvr=%_this_kmp_name-%{version}-%{-r*}
/bin/bash -${-/e/} %{_libexecdir}/kernel-livepatch/rpm-helper check "$nvr" "%1" $1
%post -n %_this_kmp_name
nvr=%_this_kmp_name-%{version}-%{-r*}
/bin/bash -${-/e/} %{_libexecdir}/kernel-livepatch/rpm-helper install "$nvr" "%1" $1
%posttrans -n %_this_kmp_name
%{?regenerate_initrd_posttrans}
%postun -n %_this_kmp_name
nvr=%_this_kmp_name-%{version}-%{-r*}
/bin/bash -${-/e/} %{_libexecdir}/kernel-livepatch/rpm-helper remove "$nvr" "%1" $1
%files -n %_this_kmp_name
%defattr (-,root,root)
%if 0%{?suse_version} >= 1600
%dir /usr/lib/modules/%1
/usr/lib/modules/%1/livepatch
%else
%dir /lib/modules/%1
/lib/modules/%1/livepatch
%endif

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-------------------------------------------------------------------
Tue May 14 14:12:02 UTC 2024 - Petr Mladek <pmladek@suse.com>
- Release version 1.4
-------------------------------------------------------------------
Tue May 14 14:09:59 UTC 2024 - Petr Mladek <pmladek@suse.com>
- kernel-livepatch-tools-devel produces livepatch packages
compatible with kernel-livepatch-tool >= 1.2
-------------------------------------------------------------------
Tue May 14 11:28:34 UTC 2024 - Petr Mladek <pmladek@suse.com>
- Fix installation paths for SL Micro 6.0 (jsc#PED-8219):
* %%{_libexecdir} newly pointing to /usr/libexec; update macros
calling kernel-livepatch/rpm-helper accordingly
* dracut files stay in /usr/lib/dracut
* rpm files stay in /usr/lib/rpm
+ kernel modules are installed under /usr/lib
- Keep backward compatibility with SLE15:
+ install the rpm macros in %%{_sysconfdir} when built for
SLE15 code base
-------------------------------------------------------------------
Tue May 14 09:09:46 UTC 2024 - Petr Mladek <pmladek@suse.com>
- Mark the package noarch. It is not architecture specific after
the klp-convert removal. But rather be conservative and do it
only for new products.
-------------------------------------------------------------------
Thu Jan 25 10:32:11 UTC 2024 - Lukáš Hruška <lukas.hruska@suse.com>
- Remove klp-convert from kernel-livepatch-tools-devel (bsc#1218644)
-------------------------------------------------------------------
Thu Jul 14 05:28:08 UTC 2022 - Libor Pechacek <lpechacek@suse.com>
- Move RPM macros away from /etc as hinted by RPMLINT
-------------------------------------------------------------------
Fri Jul 1 20:31:28 UTC 2022 - Libor Pechacek <lpechacek@suse.com>
- klp.sh, rpm-helper: Cache live patch metadata (bsc#1191344)
-------------------------------------------------------------------
Fri Jun 24 08:12:45 UTC 2022 - Libor Pechacek <lpechacek@suse.com>
- klp.sh: Add patch expiration info to klp -vv patches output
(jsc#SLE-23644)
-------------------------------------------------------------------
Fri Jun 10 10:05:16 UTC 2022 - Libor Pechacek <lpechacek@suse.com>
- rpm-helper: Avoid error messages in the absence of the
sysconfig file (bsc#1200407)
-------------------------------------------------------------------
Mon Nov 22 09:51:14 UTC 2021 - Libor Pechacek <lpechacek@suse.com>
- Add support for ZSTD kernel module compression (jsc#SLE-21256)
- klp.man,klp.sh: Fix option description and parsing
- klp.man: Drop the extra 'check' command description
- klp.sh: Add 'downgrade' command (jsc#SLE-23644)
- klp.man: Fix formatting, correct typos, adjust wording
-------------------------------------------------------------------
Fri Sep 3 14:51:38 UTC 2021 - Libor Pechacek <lpechacek@suse.com>
- Introduce controlled live patch deployment to solve the
incompatibility with the transactional server role. The
deployment mode is defined in /etc/sysconfig/livepatching.
(bsc#1187780)
-------------------------------------------------------------------
Wed Oct 7 09:16:05 UTC 2020 - Libor Pechacek <lpechacek@suse.com>
- Add support for compressed kernel modules (jsc#SLE-10886)
-------------------------------------------------------------------
Wed May 13 13:23:11 UTC 2020 - Libor Pechacek <lpechacek@suse.com>
- Fix interference with System Z boot sequence - no Grub prompt
(bsc#1171301)
-------------------------------------------------------------------
Tue Apr 21 19:24:45 UTC 2020 - Libor Pechacek <lpechacek@suse.com>
- Fix absence of live patch from initrd (bsc#1169827)
-------------------------------------------------------------------
Mon Nov 4 12:09:53 UTC 2019 - Libor Pechacek <lpechacek@suse.com>
- Remove klp-kvm-l1tf-ctrl-smt script previously used for
disabling SMT (bsc#1154648)
-------------------------------------------------------------------
Tue Sep 24 11:12:01 UTC 2019 - Libor Pechacek <lpechacek@suse.com>
- Remove superfluous self-Provides: from live patches
(bsc#1151657)
-------------------------------------------------------------------
Fri Sep 6 13:56:21 UTC 2019 - Libor Pechacek <lpechacek@suse.com>
- Simplify rpm-helper invocation in preparation for handling
non-standard kernels. As rpm-helper argument ordering changed,
package version has been bumped and Requires: for post/postun
scripts are now versioned. (bsc#1149422)
- rpm macros: fix dependencies against -rc kernels (bsc#1149422)
-------------------------------------------------------------------
Fri Apr 5 18:24:40 UTC 2019 - Joao Moreira <jmoreira@suse.com>
- Fix zero-index and .TOC. relocations in klp-convert (bsc#1129076)
-------------------------------------------------------------------
Mon Jan 28 07:26:16 UTC 2019 - lpechacek@suse.com
- Use kernel source hash for dependencies (fate#325312)
-------------------------------------------------------------------
Tue Dec 4 03:31:29 UTC 2018 - jmoreira@suse.com
- Build klp-convert without kernel-default-devel dependency
-------------------------------------------------------------------
Tue Nov 20 20:01:12 UTC 2018 - jmoreira@suse.com
- Add klp-convert to kernel-livepatch-tools-devel (fate#326849)
-------------------------------------------------------------------
Tue Aug 14 13:13:35 UTC 2018 - lpechacek@suse.com
- Add script for disabling SMT (bsc#1099306)
-------------------------------------------------------------------
Tue Apr 3 10:57:52 UTC 2018 - lpechacek@suse.com
- klp.sh: Fix blocking tasks display (bsc#1087476)
- klp.sh: Fix klp check
-------------------------------------------------------------------
Fri Mar 9 08:55:16 UTC 2018 - lpechacek@suse.com
- kgr.sh, kgr.man: Compatibility wrapper added (bsc#1084612)
- Fix Obsoletes:/Provides:
-------------------------------------------------------------------
Wed Dec 13 14:20:23 UTC 2017 - lpechacek@suse.com
- klp.man: Better describe klp -v patches output (bsc#1072162)
- klp.man: Document klp check command (bsc#1051711)
- klp.sh: Use KLP: change log records (bsc#1072117)
- klp.sh: Fix thread command line display in kgr -vv blocking
-------------------------------------------------------------------
Wed Nov 1 14:59:58 UTC 2017 - lpechacek@suse.com
- Version bump and Obsoletes: added (fate#323682)
-------------------------------------------------------------------
Mon Oct 30 10:53:21 UTC 2017 - lpechacek@suse.com
- rename kGraft to Kernel Live Patching (fate#323682)
dracut-kgraft-patch.sh -> dracut-kernel-livepatch.sh
kgraft-rpm-helper -> rpm-helper
kgraft-module-subpackage -> kernel-livepatch-subpackage
kgraft.changes -> kernel-livepatch-tools.changes
kgraft.spec -> kernel-livepatch-tools.spec
kgr.man -> klp.man
kgr.sh -> klp.sh
macros.kgraft -> macros.kernel-livepatch
kgraft-patch* modules are now livepatch* and live in
/lib/modules/$(uname -r)/livepatch
- adapt the tools to Kernel Live Patching (fate#323504)
-------------------------------------------------------------------
Thu Jun 15 18:19:53 UTC 2017 - lpechacek@suse.com
- exclusively use Fixes tag for kgr -v patches output
- kgr.sh: Correct typos
- Provide more debugging information in RPM post-trans script
(bsc#1041710)
-------------------------------------------------------------------
Mon Jan 2 10:53:15 UTC 2017 - lpechacek@suse.com
- Fix raw reference count leak in kgr -v patches (bsc#1006780)
- Make kgr useful for non-root users (bsc#989374)
-------------------------------------------------------------------
Tue Jan 5 12:33:25 UTC 2016 - lpechacek@suse.com
- kgr.sh: Indicate initial patch in kgr patches (bsc#939130)
- kgr.sh: Use Fixes tag for kgr -v patches output (bsc#939130)
-------------------------------------------------------------------
Tue Sep 22 07:24:51 UTC 2015 - lpechacek@suse.com
- kgr.sh: provide more useful information in 'patches' output
(bsc#939131)
-------------------------------------------------------------------
Tue Sep 1 11:34:49 UTC 2015 - mmarek@suse.cz
- kgraft-rpm-helper: Fix regexp for unused kgraft patches
-------------------------------------------------------------------
Fri May 29 06:29:25 UTC 2015 - lpechacek@suse.com
- kgr.sh: Fix process migration race in kgr poke (bsc#932505)
- kgr.sh: Introduce blocking_threads (bsc#931843)
- kgr.sh: Write out help when no command is provided (bnc#916191)
- kgr.sh: Deal with exiting processes (bsc#912900)
-------------------------------------------------------------------
Mon Jan 12 08:26:59 UTC 2015 - lpechacek@suse.com
- Added license file (bsc#912640)
-------------------------------------------------------------------
Mon Dec 1 15:01:33 UTC 2014 - mmarek@suse.cz
- Fix unloading of unused modules (bnc#907788)
-------------------------------------------------------------------
Tue Nov 25 15:43:28 UTC 2014 - mmarek@suse.cz
- Unload unused patches before installing a new patch (fate#318188)
-------------------------------------------------------------------
Mon Nov 24 13:57:54 UTC 2014 - mmarek@suse.cz
- Automatically name the packages as kgraft-patch-<kver>-<flavor>.
-------------------------------------------------------------------
Fri Nov 21 15:58:38 UTC 2014 - mmarek@suse.cz
- Use kernel-<flavor>-<version>-<release> in Supplements (bnc#901925)
-------------------------------------------------------------------
Fri Nov 21 15:55:40 UTC 2014 - mmarek@suse.cz
- Wait for the global kGraft flag to be cleared (bnc#905087)
-------------------------------------------------------------------
Wed Nov 12 11:10:36 UTC 2014 - mmarek@suse.cz
- Regenerate the initrd on package removal (bnc#904867)
-------------------------------------------------------------------
Tue Nov 11 21:52:41 UTC 2014 - mmarek@suse.com
- Do not run the preinstall check if the target kernel is not
running (bnc#904963)
-------------------------------------------------------------------
Tue Nov 11 21:13:20 UTC 2014 - mmarek@suse.com
- Do not duplicate the kernel version in the package version
(bnc#904668)
-------------------------------------------------------------------
Mon Nov 10 13:36:12 UTC 2014 - mmarek@suse.cz
- Switch to Supplements: packageand(kernel-<flavor>:kgraft)
(bnc#901925).
-------------------------------------------------------------------
Mon Oct 27 14:07:06 UTC 2014 - lpechacek@suse.com
- Add Supplements: kernel-<flavor>
-------------------------------------------------------------------
Tue Oct 7 16:12:18 UTC 2014 - lpechacek@suse.com
- Sanitized .spec file
-------------------------------------------------------------------
Thu Oct 2 12:18:46 UTC 2014 - lpechacek@suse.com
- Added kgr tool
-------------------------------------------------------------------
Thu May 15 16:04:14 UTC 2014 - mmarek@suse.com
- Flag the initrd to be regenerated on removal of a kgraft patch
-------------------------------------------------------------------
Thu May 15 13:49:10 UTC 2014 - mmarek@suse.com
- Add kgraft dracut module
-------------------------------------------------------------------
Wed May 14 20:17:18 UTC 2014 - mmarek@suse.com
- Package kGraft scripts and macros (fate#313296)

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#
# spec file for package kernel-livepatch-tools
#
# Copyright (c) 2024 SUSE LLC
#
# All modifications and additions to the file contributed by third parties
# remain the property of their copyright owners, unless otherwise agreed
# upon. The license for this file, and modifications and additions to the
# file, is the same license as for the pristine package itself (unless the
# license for the pristine package is not an Open Source License, in which
# case the license is the MIT License). An "Open Source License" is a
# license that conforms to the Open Source Definition (Version 1.9)
# published by the Open Source Initiative.
# Please submit bugfixes or comments via http://bugs.opensuse.org/
#
# From dracut package
%define dracutlibdir %{_prefix}/lib/dracut
Name: kernel-livepatch-tools
Version: 1.4
Release: 0
Summary: Scripts for installing kernel live patches
License: GPL-2.0-only
Group: System/Kernel
Source1: rpm-helper
Source2: dracut-module-setup.sh
Source3: dracut-kernel-livepatch.sh
Source4: kernel-livepatch-subpackage
Source5: macros.kernel-livepatch
Source6: klp.sh
Source7: klp.man
Source8: COPYING
Source12: sysconfig.livepatching
Source13: cache-cleaner
Source14: systemd-default-klp.preset
Source15: systemd-klp-info-cache.service
# compatibility with SLE 12, to be removed in SLE > 15
Source50: kgr.sh
Source51: kgr.man
Provides: kgraft = %version
Obsoletes: kgraft < %version
%if 0%{?suse_version} >= 1600
BuildArch: noarch
%endif
%description
This package contains a helper script used when installing kernel live patch
packages and kernel live patch monitoring tool.
%package devel
Summary: Macros for building kernel live patches
Group: Development/Tools/Building
# The OBS build does a testinstallation of all built packages, which needs
# the kernel-livepatch-tools runtime package
Requires: %{name}
Requires: kmod-compat
%description devel
This package contains RPM macro definitions for building kernel live patch
packages.
%prep
%setup -q -Tc
cp %{_sourcedir}/{rpm-helper,dracut-{module-setup,kernel-livepatch}.sh,sysconfig.livepatching} .
cp %{_sourcedir}/{kernel-livepatch-subpackage,macros.kernel-livepatch} .
cp %{_sourcedir}/k{lp,gr}.{sh,man} .
cp %{_sourcedir}/{cache-cleaner,systemd-{default-klp.preset,klp-info-cache.service}} .
cp %{_sourcedir}/COPYING .
%build
%install
install -D rpm-helper %{buildroot}%{_libexecdir}/kernel-livepatch/rpm-helper
install -D dracut-module-setup.sh \
%{buildroot}%{dracutlibdir}/modules.d/99kernel-livepatch/module-setup.sh
install -D dracut-kernel-livepatch.sh \
%{buildroot}%{dracutlibdir}/modules.d/99kernel-livepatch/kernel-livepatch.sh
install -D -m0644 kernel-livepatch-subpackage %{buildroot}%{_prefix}/lib/rpm/kernel-livepatch-subpackage
%if 0%{?suse_version} >= 1600
install -D -m0644 macros.kernel-livepatch %{buildroot}%{_rpmmacrodir}/macros.kernel-livepatch
%else
install -D -m0644 macros.kernel-livepatch %{buildroot}%{_sysconfdir}/rpm/macros.kernel-livepatch
%endif
install -D -m0755 klp.sh %{buildroot}%{_bindir}/klp
install -D -m0755 kgr.sh %{buildroot}%{_bindir}/kgr
sed -i 's/@@VERSION@@/%{version}-%{release}/' %{buildroot}%{_bindir}/klp
install -d %{buildroot}%{_mandir}/man8
gzip -c9 klp.man > %{buildroot}%{_mandir}/man8/klp.8.gz
gzip -c9 kgr.man > %{buildroot}%{_mandir}/man8/kgr.8.gz
install -D -m0755 cache-cleaner %{buildroot}%{_libexecdir}/kernel-livepatch/cache-cleaner
install -D -m0644 systemd-klp-info-cache.service %{buildroot}/%{_unitdir}/klp-info-cache.service
install -D -m0644 systemd-default-klp.preset %{buildroot}/%{_presetdir}/60-default-klp.preset
install -d %{buildroot}%{_docdir}
install -D -m 644 sysconfig.livepatching %{buildroot}%{_fillupdir}/sysconfig.livepatching
install -d %{buildroot}%{_localstatedir}/cache/livepatch/
%pre
%service_add_pre klp-info-cache.service
%post
%service_add_post klp-info-cache.service
%{fillup_only -n livepatching}
%preun
%service_del_preun klp-info-cache.service
%postun
%service_del_postun klp-info-cache.service
%files
%{_libexecdir}/kernel-livepatch
%dir %{dracutlibdir}
%dir %{dracutlibdir}/modules.d
%{dracutlibdir}/modules.d/99kernel-livepatch
%{_bindir}/k{lp,gr}
%{_mandir}/man8/k{lp,gr}.8%{ext_man}
%{_fillupdir}/*
%dir %{_localstatedir}/cache/livepatch/
%{_libexecdir}/kernel-livepatch/cache-cleaner
%{_unitdir}/klp-info-cache.service
%{_presetdir}/60-default-klp.preset
%license COPYING
%files devel
%if 0%{?suse_version} >= 1600
%{_rpmmacrodir}/macros.kernel-livepatch
%else
%{_sysconfdir}/rpm/macros.kernel-livepatch
%endif
%{_prefix}/lib/rpm/kernel-livepatch-subpackage
%changelog

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.\" Libor Pechacek <lpechacek@suse.com>
.\"
.TH KLP 8 2017-12-13 "SLES 15" "SLE Live Patching"
.SH NAME
kgr \- compatibility wrapper for migration from kGraft / SLE 12
.SH SYNOPSIS
.ll +8
.B kgr
.RB [ " \-hv " ]
.RI COMMAND
.ll -8
.SH DESCRIPTION
.I kgr
is a lightweight wrapper for the new klp tool. It is provided for smooth
migration from SLE 12 and will be removed in future SLE releases.
.SH COMMANDS
.TP
.B status
See klp(1) for description.
.TP
.B check
See klp(1) for description.
.TP
.B patches
See klp(1) for description.
.TP
.B blocking
See klp(1) for description. Unlike the SLE 12 implementation, this command
displays execution threads. Processes display is known to be incomplete for
multi-threaded applications.
.TP
.B blocking_threads
Obsolete command.
Same as
.I kgr
.IR blocking .
.TP
.B poke
Obsolete command. Send STOP and CONT signals to processess that are blocking
kGraft progress. See
.SM
.B CAVEATS
for discussion about this method.
.SH OPTIONS
.TP
.B \-h --help
Display a help screen and quit.
.TP
.B \-v --verbose
Verbose. Makes
.I kgr
print out process command line with
.B blocking
and
.B blocking_threads
commands.
Another
.B \-v
will display also strack traces.
.TP
.B \--version
Version. Display the version number.
.SH EXIT STATUS
With
.B
check
command the exit status is 0 when system is ready for kernel live patching and
1 when patching is in progress. For other commands the exit status is 0 upon
successful command completion and 1 upon error.
.SH CAVEATS
By design, kGraft technology requires the processes to cross the user
space/kernel boundary to present them with the patched kernel code. Processes
that sleep in kernel code at the time the patch module is loaded will prevent
patching process from finishing until they leave kernel space. These processes
usually leave kernel after the event, for which they are waiting, happens or
timeout elapses.
.P
Sending regular processes STOP signal followed by CONT signal achieves the
goal of making them to cross the user space/kernel boundary immediately. However, this
method may not be suitable for all processes running in the system and does not
apply to kernel threads and processess in
.B D
process state. This method is also known to interfere with shell job control.

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#!/bin/bash
# Compatibility wrapper for kGraft / SLE 12
# Will be removed in future SLE releases
# Libor Pechacek <lpechacek@suse.com>
unset VERBOSE
unset VERBOSE_OPT
function kgr_poke_processes() {
if [[ $EUID -ne 0 ]]; then
echo "Warning: running as non-root user, only this user's processes will be poked" >&2
fi
for PROC in /proc/[0-9]*; do
if [ 0$(cat $PROC/kgr_in_progress 2>/dev/null) -ne 0 ]; then
PID=$(echo $PROC | cut -d/ -f3)
if [ -n "$VERBOSE" ]; then
echo "sending $PID STOP/CONT"
fi
kill -STOP $PID
# give kernel time to distribute the signal to all threads
sleep .1
kill -CONT $PID
fi
done
}
USAGE="Usage: $0 [-h][-v] COMMAND
Compatibility wrapper for migration from kGraft / SLE 12. Use klp(1) in new
applications. This wrappere will be removed in future SLE releases.
Commands:
status: display the overall status of kernel live patching
patches: display the list of loaded patches
blocking: list execution threads that are preventing kernel
live patching from finishing
blocking_threads: (obsolete) same as blocking
poke: (obsolete) move forward with the kernel live patching by
sending STOP and CONT signal to the pending processes
Options:
-h print this help
-v more detailed output
Report bugs at https://bugzilla.suse.com/."
PKGVERSION="@@VERSION@@"
while getopts vh-: opt
do
case $opt$OPTARG in
-help|h)
exec echo "$USAGE" ;;
-version)
exec echo "kgr $PKGVERSION" ;;
v) VERBOSE=$((${VERBOSE:-0} + 1))
VERBOSE_OPT="$VERBOSE_OPT -v";;
*)
echo "$0: try '$0 --help'" >&2; exit 1 ;;
esac
done
shift `expr $OPTIND - 1`
if [ $# -ne 1 ]; then
echo -e "Error: no command provided\n" >&2
echo "$USAGE"
exit 1
fi
case $1 in
blocking) exec klp $VERBOSE_OPT blocking ;;
blocking_threads) exec klp $VERBOSE_OPT blocking ;;
poke) kgr_poke_processes ;;
status) exec klp $VERBOSE_OPT status ;;
check) exec klp $VERBOSE_OPT check ;;
patches) exec klp $VERBOSE_OPT patches ;;
*) echo "Error: unknown command \`$1'"; exit 1 ;;
esac
# vim: ai sw=4 et sts=4 ft=sh

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.\" Libor Pechacek <lpechacek@suse.com>
.\"
.TH KLP 8 2021-03-24 "SLES 15" "SLE Live Patching"
.SH NAME
klp \- query kernel live patching status
.SH SYNOPSIS
.ll +8
.B klp
.RB [ " \-hv " ]
.RI COMMAND
.ll -8
.SH DESCRIPTION
.I klp
command can be used for getting a quick overview of the kernel live patching status.
For some of the commands, the output can be made more verbose by using the
.B \-v
option.
.SH COMMANDS
.TP
.B status
Display the overall status of kernel live patching (ready or in_progress)
.TP
.B check
Indicate the overall kernel live patching status with exit code. This command
is intended for use in scripts.
.TP
.B patches
Display the list of loaded patches. By default, the command prints out only
kernel modules that contain live patches. With
.B \-v
additional fields are printed.
.I Active
tells whether the patch is currently in use or can be unloaded.
.I RPM
shows the RPM package name in which the kernel live patch was distributed. The
.I CVE
section lists fixes included in this live patch, which have CVE numbers
assigned. The
.I "Bug fixes and enhancements"
part lists changes included in this live patch, which do not have CVEs assigned.
More information about individual changes can be found in the patch RPM
package changelog, SUSE Security Advisories, CVE database, and the patch RPM
source code. Another
.B \-v
will display patch expiration and update status information.
.TP
.B blocking
List process threads that are preventing live patching from finishing. By
default, just the PIDs are listed. By specifying the
.B \-v
option will make
.I klp
print out the process command line. Another
.B \-v
will display also stack traces if available.
.TP
.B downgrade
Replace the current kernel live patch with its previous version. The tool
first constructs a system management command for the downgrade and, after
confirmation, performs the downgrade. Specifying the non\(hyinteractive
mode with
.B \-n
will make
.I klp
skip the confirmation.
.TP
.SH OPTIONS
.TP
.B \-h, \-\-help
Display a help screen and quit.
.TP
.B \-n, \-\-non\-interactive
Switches to non\(hyinteractive mode and assumes "yes" on interactive commands.
.TP
.B \-v, \-\-verbose
Verbose. Makes
.I klp
print out process command line with
.B blocking
command.
Another
.B \-v
will also display stack traces.
.TP
.B \-\-version
Version. Display the version number.
.SH CAVEATS
By design, kernel live patching technology requires the processes to cross the
userspace/kernel boundary to present them with the patched kernel code. Processes
that execute kernel code at the time the patch module is loaded will prevent
the patching process from finishing until they leave kernel space. These processes
usually leave kernel after the event for which they are waiting happens or
timeout elapses. As an optimization, the kernel live patching core will not
consider processes that do not interact with the live patch being applied in
the above migration. The live patching core will also "wake up" sleeping
processes in a userspace transparent way, making the patch application progress.
.P
Despite the above measures, processes in
.B D
process state can prevent the patch from fully applying, and also kernel threads can
become a blocker under certain conditions.
.SH CHANGES FROM KGR TOOL
.I klp
tool is a modernized version of the previous
.I kgr
tool distributed with SUSE Linux Enterprise 12. It leaves out the
.B poke
functionality, which is now implemented in the kernel, and
.B blocking_threads
display, which is the default operation of
.I klp blocking
command.

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#!/bin/bash
# Check kernel live patching status
# Libor Pechacek <lpechacek@suse.com>
unset VERBOSE
function klp_in_progress() {
for p in /sys/kernel/livepatch/*; do
[ 0$(cat "$p/transition" 2>/dev/null) -ne 0 ] && return 0
done
return 1
}
function klp_dump_blocking_threads() {
if [[ $EUID -ne 0 ]]; then
echo "Warning: running as non-root user, display will be limited" >&2
fi
unset PIDS
TRANSITIONING_PATCH="$(grep -ls '^1$' /sys/kernel/livepatch/*/transition | head -n1)"
if [ -n "$TRANSITIONING_PATCH" ]; then
TRANSITION_DIRECTION=$(cat "${TRANSITIONING_PATCH/%\/transition/\/enabled}")
for DIR in /proc/[0-9]*/task/[0-9]*; do
PATCH_STATE=$(cat $DIR/patch_state 2>/dev/null)
if [ -n "$PATCH_STATE" ] && [ "$PATCH_STATE" -ge 0 \
-a "$PATCH_STATE" -ne "$TRANSITION_DIRECTION" ]; then
PID=${DIR#/proc/}
PID=${PID%/task/*}
TID=${DIR#*/task/}
if [ -n "$VERBOSE" ]; then
COMM="$(cat $DIR/cmdline 2>/dev/null | tr \\0 \ )"
# fallback to the command name, for example for kernel threads
[ -z "$COMM" ] && COMM="[$(cat $DIR/comm 2>/dev/null | tr \\0 \ )]"
if [ ${VERBOSE:-0} -gt 1 ]; then
STACK=$(cat $DIR/stack 2>/dev/null | sed 's/^/ /')
fi
# don't write out anything in case the process has exited
if [ -e "$DIR" ]; then
echo "$PID $TID $COMM"
[ ${VERBOSE:-0} -gt 1 ] && echo "$STACK"
fi
else
echo $PID $TID
fi
PIDS="$PIDS $PID"
fi
done
fi
if [ -z "$PIDS" -a -n "$VERBOSE" ]; then
echo "no threads with klp_in_progress set"
fi
}
function klp_status() {
if klp_in_progress ; then
echo "in_progress"
else
echo "ready"
fi
}
function klp_check() {
if klp_in_progress ; then
echo "Following processes have not finished a previous kernel live patching yet:"
VERBOSE=2 klp_dump_blocking_threads
return 1
fi
}
function klp_patches() {
unset PATCHES_FOUND
for d in /sys/kernel/livepatch/*; do
[ ! -d "$d" ] && continue
PATCH_NAME=${d#/sys/kernel/livepatch/}
PATCH_MOD=${PATCH_NAME}
echo "${PATCH_MOD}"
if [ -n "$VERBOSE" ]; then
klp_detailed_patch_info "${PATCH_MOD}" | sed 's/^/ /'
echo
fi
PATCHES_FOUND=1
done
if [ -z "$PATCHES_FOUND" -a -n "$VERBOSE" ]; then
echo "no patch"
fi
}
function klp_patch_rpm_name() {
# srcversion is the link between loaded kernel module and its RPM
SRCVERSION=$(cat "/sys/module/$1/srcversion")
# exit when the module cannot be tracked down
MODPATH=$(/usr/sbin/modinfo -n "$1" 2>/dev/null) || exit
MODSRCVERSION=$(/usr/sbin/modinfo -F srcversion "$1")
if [ "$SRCVERSION" != "$MODSRCVERSION" ]; then
echo "Warning: patch module srcversion does not match the on-disk checksum:" \
"$1 ($SRCVERSION/$MODSRCVERSION)" >&2
exit 1
fi
echo $(rpm -qf "${MODPATH}" 2>/dev/null)
}
function klp_info_from_rpm() {
RPMNAME=$(klp_patch_rpm_name "$1")
[ -n "$RPMNAME" ] || exit
REFS=($(rpm -q --changelog "${RPMNAME}" | \
sed 's/^[[:space:]]*KLP:[[:space:]]*\(.*\)/\1/;t b;d;:b s/[[:space:]]/\n/g' | \
sort -ru))
declare -a CVES
declare -a BUGS_FATES
for REF in "${REFS[@]}"; do
if [ ${REF:0:3} = 'CVE' ]; then
CVES+=($REF)
else
BUGS_FATES+=($REF)
fi
done
declare -p RPMNAME
declare -p CVES
declare -p BUGS_FATES
}
function klp_detailed_patch_info() {
REFCNT=$(cat "/sys/module/$1/refcnt")
ACTIVE=$([[ "$REFCNT" -eq 0 ]]; echo $?)
echo "active: ${ACTIVE}"
# collect info if we have it; first try the "cache" (bsc#1191344)
SRCVERSION=$(cat "/sys/module/$1/srcversion")
CACHE_FILE="/var/cache/livepatch/$1-$SRCVERSION"
if [ -e "$CACHE_FILE" ]; then
. "$CACHE_FILE"
else
KLP_INFO=$(klp_info_from_rpm $1)
echo "$KLP_INFO" > "$CACHE_FILE"
eval "$KLP_INFO"
fi
[ -n "$RPMNAME" ] || exit
echo "RPM: ${RPMNAME}"
echo -n "CVE: "
if [ ${#CVES[*]} -gt 0 ]; then
echo ${CVES[*]}
else
echo -n "(none"
[ ${#BUGS_FATES[*]} -eq 0 ] && echo -n " - this is an initial kernel live patch"
echo ")"
fi
echo -n "bug fixes and enhancements: "
if [ ${#BUGS_FATES[*]} -gt 0 ]; then
echo ${BUGS_FATES[*]}
else
echo "(none)"
fi
if [ ${VERBOSE:-0} -gt 1 ]; then
SHORT_RPMNAME=$(rpm -q --qf "%{name}" "$RPMNAME" 2>/dev/null)
echo -n "Update status: "
if zypper -qn --no-refresh up -D "$SHORT_RPMNAME" 2>/dev/null | fgrep -q "package to upgrade"; then
echo "newer version is available"
else
echo "up to date"
fi
EXP_DATE=$(grep "^$SHORT_RPMNAME," /usr/share/lifecycle/data/sle-module-live-patching.lifecycle 2>/dev/null \
| cut -d, -f3)
echo -n "Patches issued until: "
if [ -n "$EXP_DATE" ]; then
echo "$EXP_DATE"
else
echo "to be announced"
fi
fi
}
function klp_downgrade()
{
VERBOSE_ORIG="$VERBOSE"
unset VERBOSE
for patch in $(klp_patches); do
RPM_FULL_NAME=$(klp_patch_rpm_name "$patch")
if [ -z "$RPM_FULL_NAME" ]; then
echo "Warning: cannot determine RPM package for $patch" >&2
continue
fi
RPM_INFO=$(rpm -q --qf '%{name};%{version}' "$RPM_FULL_NAME")
RPM_VERSION=${RPM_INFO#*;}
RPM_NAME=${RPM_INFO%;*}
if [ "$RPM_VERSION" -le 1 ]; then
echo "$RPM_FULL_NAME is the initial kernel live patch and cannot be downgraded."
continue
fi
ZYPPER_COMMAND="zypper -n in --oldpackage $RPM_NAME = $(($RPM_VERSION-1))"
echo "KLP tool will replace the current kernel live patch with its previous version."
echo "The command for downgrade is: $ZYPPER_COMMAND"
if [ -z "$NON_INTERACTIVE" ]; then
read -p "Continue? (y/N) " -n 1 -r
echo
else
REPLY=Y
fi
if [[ $REPLY =~ ^[Yy]$ ]]; then
eval $ZYPPER_COMMAND
fi
done
VERBOSE="$VERBOSE_ORIG"
}
USAGE="Usage: $0 [-h][-v] COMMAND
Query kernel live patching status.
Commands:
status: display the overall status of kernel live patching
patches: display the list of loaded patches
blocking: list execution threads that are preventing kernel
live patching from finishing
downgrade: revert the current live patch by installing
the previous one
Options:
-h print this help
-n non-interactive mode
-v more detailed output
Report bugs at https://bugzilla.suse.com/"
PKGVERSION="@@VERSION@@"
while getopts hnv-: opt
do
case $opt$OPTARG in
-help|h)
exec echo "$USAGE" ;;
-non-interactive|n)
NON_INTERACTIVE=1 ;;
-version)
exec echo "klp $PKGVERSION" ;;
-verbose|v) VERBOSE=$((${VERBOSE:-0} + 1)) ;;
*)
echo "$0: try '$0 --help'" >&2; exit 1 ;;
esac
done
shift `expr $OPTIND - 1`
if [ $# -lt 1 ]; then
echo -e "Error: no command provided\n" >&2
echo "$USAGE"
exit 1
fi
case $1 in
blocking) klp_dump_blocking_threads ;;
status) klp_status ;;
check) klp_check ;;
store_patch_info)
SRCVERSION=$(cat "/sys/module/$2/srcversion")
klp_info_from_rpm $2 > "/var/cache/livepatch/$2-$SRCVERSION" ;;
patches) klp_patches ;;
downgrade) klp_downgrade ;;
*) echo "Error: unknown command \`$1'"; exit 1 ;;
esac
# vim: ai sw=4 et sts=4 ft=sh

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# Defines %flavors_to_build and %kernel_source() as a side effect.
%klp_module_package(n:x) \
%{expand:%( \
subpkg=/usr/lib/rpm/kernel-livepatch-subpackage \
echo "%%define _suse_klp_module_subpackage(n:v:r:f:p:bc) %%{expand:%%(cd %_sourcedir; cat $subpkg; echo %%%%nil)}" \
flavors_to_build= \
flavors="%*" \
for flavor in $(ls /usr/src/linux-obj/%_target_cpu 2>/dev/null); do \
case " $flavors " in \
(*" $flavor "*) \
[ -n "%{-x}" ] && continue ;; \
(*) \
[ -z "%{-x}" -a -n "$flavors" ] && continue ;; \
esac \
krel=$(make -s -C /usr/src/linux-obj/%_target_cpu/$flavor kernelrelease) \
krpmver_flavor=${krel/.0-rc/.rc} \
krpmver=${krpmver_flavor%%-*} \
kprovide="kernel-$flavor-$krpmver" \
khashprovide=$(rpm -q --whatprovides "$kprovide" --provides | grep "^kernel-$flavor-srchash-") \
if [ -n "$khashprovide" ]; then \
kprovide="$khashprovide" \
fi \
flavors_to_build="$flavors_to_build $flavor" \
echo "%%_suse_klp_module_subpackage -n %{-n*}%{!-n:kernel-livepatch} -r %{release} $krel $krpmver_flavor $kprovide" \
done \
echo "%%global flavors_to_build${flavors_to_build:-%%nil}" \
echo "%%{expand:%%(test -z '%flavors_to_build' && echo %%%%internal_kmp_error)}" \
echo "%%global kernel_source() /usr/src/linux-obj/%_target_cpu/%%%%{1}" \
\
echo "%package -n %{-n*}%{!-n:kernel-livepatch}-kmp-_dummy_" \
echo "Version: %version" \
echo "Summary: %summary" \
echo "Group: %group" \
echo "%description -n %{-n*}%{!-n:kernel-livepatch}-kmp-_dummy_" \
)}

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rpm-helper Normal file
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#!/bin/bash
USAGE="$0 <check|install|remove> <package-version-release>"
if test "$1" = "-h" -o "$1" = "--help"; then
echo "$USAGE"
exit 0
fi
if test "$#" -lt 2; then
echo "$USAGE" >&2
exit 1
fi
shopt -s nullglob
check_livepatching_env()
{
LIVEPATCH_KERNEL=auto
# Check if a sysconfig for livepatching exists. If yes, include the file.
if test -e "/etc/sysconfig/livepatching"; then
. /etc/sysconfig/livepatching || :
fi
# We want to preserve the immutability of the system in the
# transactional server role. To that end, we define the "auto" patch
# deployment mode that skips the patch loading in transactional
# updates.
DO_PATCHING=0
[ "$TRANSACTIONAL_UPDATE" != "true" -a "$LIVEPATCH_KERNEL" == "auto" ] && DO_PATCHING=1
[ "$LIVEPATCH_KERNEL" == "always" ] && DO_PATCHING=1
[ "$DO_PATCHING" -eq 0 ] && return 1
return 0
}
do_check()
{
if test -e /.buildenv; then
echo "Skipping kernel live patches in buildroot"
return 0
fi
check_livepatching_env || return 0
if test "$(uname -r)" != "$KREL"; then
return 0
fi
klp check >&2
}
refresh_initrd()
{
local image
/sbin/depmod -F "/boot/System.map-$KREL" -e "$KREL" || return
# copied from weak-modules2
for image in vmlinuz image vmlinux linux bzImage uImage Image ""; do
if test -f "/boot/$image-$KREL"; then
break
fi
done
if test -z "$image"; then
return
fi
if test "$1" = "--force"; then
/sbin/mkinitrd -k "/boot/$image-$KREL" -i "/boot/initrd-$KREL"
else
mkdir -p /var/run/regenerate-initrd
touch "/var/run/regenerate-initrd/$image-$KREL"
fi
}
do_install()
{
local mod modules err
if test -e /.buildenv; then
return 0
fi
refresh_initrd
if test "$(uname -r)" != "$KREL"; then
return 0
fi
if ! check_livepatching_env; then
echo "[klp] Skipping installation of the kernel live patch."
return 0
fi
err=0
modules=($(grep -l '^0$' /sys/module/livepatch*/refcnt /dev/null | sed 's:/refcnt::; s:/sys/module/::'))
for mod in "${modules[@]}"; do
echo "[klp] Unloading $mod"
# Can't use modprobe -r, as the modules do not exist on disk
# anymore
rmmod "$mod" || :
done
modules=($(rpm -ql "$PACKAGE" | sed -rn 's:.*/(livepatch[^/]*)\.ko(\.[gx]z|\.zst)?$:\1:p'))
for mod in "${modules[@]}"; do
echo "[klp] Loading $mod"
modprobe "$mod" || err=$?
done
klp store_patch_info "$(echo "$mod" | tr - _)"
return $err
}
do_remove()
{
if test -e /.buildenv; then
return 0
fi
if test "$NUM_PACKAGES" -eq 0; then
# bnc#904867
refresh_initrd --force
else
refresh_initrd
fi
}
if test $# -ne 4; then
echo 'WARNING: Unexpected number of parameters. Are the live patch RPM scripts compatible with this rpm-helper?' >&2
fi
cmd=$1
PACKAGE=$2
KREL=$3
NUM_PACKAGES=${4-0}
case "$cmd" in
check|install|remove)
do_$cmd
exit
;;
*)
echo "$USAGE" >&2
exit 1
esac

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sysconfig.livepatching Normal file
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## Path: System/Live Patching
## Description: Configuration of the system live patch deployment
## Type: string
## Default: "auto"
# Controls whether kernel live patches should be loaded into
# kernel during live patch RPM package installation. The valid
# settings are "always", "never" and "auto".
LIVEPATCH_KERNEL='auto'

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systemd-default-klp.preset Normal file
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enable klp-info-cache.service

13
systemd-klp-info-cache.service Normal file
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[Unit]
Description=Clean up the klp(8) tool cache on boot
After=local-fs.target
ConditionPathIsReadWrite=/var/cache/livepatch
[Service]
Type=oneshot
Nice=19
IOSchedulingClass=idle
ExecStart=/usr/lib/kernel-livepatch/cache-cleaner
[Install]
WantedBy=multi-user.target