Debian: kpatch: support the signature for livepatch module
Add the support for the signature of livepatched modules, so we can
avoid the unsigned kernel module loading issue.
Test Plan:
Pass: Verify the kpatch-build building process.
Pass: Execute shellcheck tool without errors and warnings for
the kpatch-build script after applying this patch.
Story: 2009221
Task: 44580
Signed-off-by: Zhixiong Chi <zhixiong.chi@windriver.com>
Change-Id: Ieb56539b873dab3eab350797b8c3ab2d8923ef5d
This commit is contained in:
Zhixiong Chi
parent
b33187d154
commit
0ac0effe14
@ -0,0 +1,138 @@
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From 92337a56eaee72228a73846a65660cae1c98cc88 Mon Sep 17 00:00:00 2001
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From: Zhixiong Chi <zhixiong.chi@windriver.com>
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Date: Thu, 5 May 2022 02:41:42 -0700
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Subject: [PATCH] kpatch: Add the signature for livepatch kernel modules
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As the commit [https://review.opendev.org/c/starlingx/kernel/+/838284]
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shows, once lockdown feature for secure boot was enabled, the unsigned
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kernel modules' loading will fail with the error 'Operation not permitted'.
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For livepatched kernel module we also need to sign the module so that we
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can insmod the module successfully when the command 'kpatch load xxx.ko'
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or 'systemctl start kpatch.service' is executed.
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Add '-k/--keydir' to support the customzied pubkey/privkey pairs.
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Drop some unused variables for starlingx platform.
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Signed-off-by: Zhixiong Chi <zhixiong.chi@windriver.com>
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---
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kpatch-build/kpatch-build | 54 ++++++++++++++++++++++++++-------------
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1 file changed, 36 insertions(+), 18 deletions(-)
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diff --git a/kpatch-build/kpatch-build b/kpatch-build/kpatch-build
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index 3c721ea..8a9fa03 100755
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--- a/kpatch-build/kpatch-build
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+++ b/kpatch-build/kpatch-build
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@@ -49,6 +49,11 @@ ENVFILE="$TEMPDIR/kpatch-build.env"
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LOGFILE="$CACHEDIR/build.log"
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RELEASE_FILE=/etc/os-release
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LINUXSRCDIR=/usr/src
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+KVERSION=$(uname -r)
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+KEYDIR="${LINUXSRCDIR}/kernels/${KVERSION}"
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+SIGNTOOLDIR=(/usr/lib/linux*-kbuild-*/scripts)
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+SIGNTOOL="sign-file"
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+SIGHASH="sha256"
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DEBUG=0
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SKIPCLEANUP=0
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SKIPCOMPILERCHECK=0
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@@ -523,6 +528,19 @@ module_name_string() {
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echo "${1//[^a-zA-Z0-9_-]/-}" | cut -c 1-48
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}
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+# Sign the generated livepatched kernel module
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+sign_module() {
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+ local module=${1}
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+ PRIVKEY="${KEYDIR}/signing_key.pem"
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+ PUBKEY="${KEYDIR}/signing_key.x509"
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+ SIGNTOOL_ABSPATH=$(find "${SIGNTOOLDIR[@]}" -name "${SIGNTOOL}")
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+ [[ ! -e "${SIGNTOOL_ABSPATH}" ]] && die "can't find ${SIGNTOOL}."
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+ [[ ! -e "${PRIVKEY}" ]] && die "can't find privkey ${PRIVKEY}."
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+ [[ ! -e "${PUBKEY}" ]] && die "can't find publickey ${PUBKEY}."
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+
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+ "${SIGNTOOL_ABSPATH}" "${SIGHASH}" "${PRIVKEY}" "${PUBKEY}" "${module}" || die "Sign module ${module} failed!"
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+}
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+
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usage() {
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echo "usage: $(basename "$0") [options] <patch1 ... patchN>" >&2
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echo " patchN Input patchfile(s)" >&2
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@@ -547,7 +565,7 @@ usage() {
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echo " (not recommended)" >&2
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}
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-options="$(getopt -o ha:r:s:c:v:j:t:n:o:de:R -l "help,archversion:,sourcerpm:,sourcedir:,config:,vmlinux:,jobs:,target:,name:,output:,oot-module:,debug,skip-gcc-check,skip-compiler-check,skip-cleanup,non-replace" -- "$@")" || die "getopt failed"
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+options="$(getopt -o ha:r:s:c:v:j:t:n:o:k:de:R -l "help,archversion:,sourcerpm:,sourcedir:,config:,vmlinux:,jobs:,target:,name:,output:,keydir:,oot-module:,debug,skip-gcc-check,skip-compiler-check,skip-cleanup,non-replace" -- "$@")" || die "getopt failed"
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eval set -- "$options"
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@@ -599,6 +617,11 @@ while [[ $# -gt 0 ]]; do
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BASE="$(readlink -f "$2")"
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shift
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;;
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+ -k|--keydir)
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+ [[ ! -d "$2" ]] && die "keydir '$2' not found"
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+ KEYDIR="$(readlink -f "$2")"
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+ shift
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+ ;;
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-d|--debug)
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DEBUG=$((DEBUG + 1))
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if [[ $DEBUG -eq 1 ]]; then
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@@ -785,22 +808,7 @@ else
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echo "Debian/Ubuntu distribution detected"
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- if [[ "$DISTRO" = ubuntu ]]; then
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-
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- # url may be changed for a different mirror
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- url="http://archive.ubuntu.com/ubuntu/pool/main/l"
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- sublevel="SUBLEVEL = 0"
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-
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- elif [[ "$DISTRO" = debian ]]; then
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-
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- # url may be changed for a different mirror
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- url="http://ftp.debian.org/debian/pool/main/l"
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- sublevel="SUBLEVEL = 0"
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- fi
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-
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- pkgname="$(dpkg-query -W -f='${Source}' "linux-image-$ARCHVERSION" | sed s/-signed//)"
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- pkgver="$(dpkg-query -W -f='${Version}' "linux-image-$ARCHVERSION")"
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- dscname="${pkgname}_${pkgver}.dsc"
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+ sublevel="SUBLEVEL = 0"
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clean_cache
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@@ -815,7 +823,7 @@ else
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KSRCVER="${KVER%.*}"
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KSRCNAME="$LINUXSRCDIR/linux-source-$KSRCVER.tar.xz"
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if [[ -e "$KSRCNAME" ]]; then
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- tar xvf $KSRCNAME
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+ tar xvf "${KSRCNAME}" 2>&1 | logger || die
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mv "linux-source-$KSRCVER" "$SRCDIR" || die
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fi
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# Due to the ostree mechanism, we need add the prefix for kernel config here
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@@ -977,6 +985,14 @@ else
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MAKEVARS+=("LD=${KPATCH_CC_PREFIX}ld")
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fi
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+# Adjust the kconfig
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+KCONFIGACK=""
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+KCONFIGCOUNT=$(make listnewconfig | wc -l)
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+while [[ "${KCONFIGCOUNT}" -gt 0 ]]; do
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+ KCONFIGACK=${KCONFIGACK}"\n"
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+ let KCONFIGCOUNT--
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+done
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+echo -e "${KCONFIGACK}" | make -f ./Makefile syncconfig 2>&1 | logger || die
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# $TARGETS used as list, no quotes.
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# shellcheck disable=SC2086
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@@ -1257,6 +1273,8 @@ UNDEFINED=$(comm -23 <(sort -u "${TEMPDIR}"/undefined_references) \
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cp -f "$TEMPDIR/patch/$MODNAME.ko" "$BASE" || die
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+sign_module "${BASE}/${MODNAME}.ko" | logger
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+
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[[ "$DEBUG" -eq 0 && "$SKIPCLEANUP" -eq 0 ]] && rm -f "$LOGFILE"
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echo "SUCCESS"
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--
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2.34.1
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@ -1 +1,2 @@
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0001-kpatch-Support-for-WRCP.patch
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0002-kpatch-Add-the-signature-for-livepatch-kernel-module.patch
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