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Merge bugfix/add_apparmor515_focal into ubuntu/focal [a=philroche] [r=ankushpathak,jessica-youjeong,vorlon]

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feat(apparmor): Add kernel apparmor check to snap validation (LP: #2052789)

For jammy and later, snap validation verifies that the kernel
version matches the livecd-rootfs version, if available.  This
change bring focal in line with that paradigm.  This is necessary
due to the linux-$CLOUD-5.15 kernels requiring a different
apparmor feature set that generic.

feat: add 5.15 apparmor directory (LP: #2052789)

After the kernel roll to linux-gcp-5.15-5.15.0-1051.59_20.04.1,
basic_ubuntu::test_snap_preseed_optimized began failuring due to
a preseed mismatch.  This change adds a 5.15 apparmor configuration
to the focal branch.

MP: https://code.launchpad.net/~philroche/livecd-rootfs/+git/livecd-rootfs/+merge/460323
ubuntu/focal
Philip Roche 10 months ago
parent 83d1496ca8 e51e89423d
commit 081a251efd
34 changed files with 71 additions and 1 deletions
Show Stats Download Patch File Download Diff File

7
debian/changelog vendored
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@ -1,3 +1,10 @@
livecd-rootfs (2.664.53) UNRELEASED; urgency=medium
[Catherine Redfield]
* add 5.15 apparmor directory for snap preseeding with 5.15 kernel (LP: #2052789)
-- Phil Roche <phil.roche@canonical.com> Fri, 09 Feb 2024 09:41:18 +0000
livecd-rootfs (2.664.52) focal; urgency=medium
* fix: use correct sshd_config.d/ ordering. (LP: #2049860)

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live-build/apparmor/5.15/capability
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0xffffff

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chown dac_override dac_read_search fowner fsetid kill setgid setuid setpcap linux_immutable net_bind_service net_broadcast net_admin net_raw ipc_lock ipc_owner sys_module sys_rawio sys_chroot sys_ptrace sys_pacct sys_admin sys_boot sys_nice sys_resource sys_time sys_tty_config mknod lease audit_write audit_control setfcap mac_override mac_admin syslog wake_alarm block_suspend audit_read

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acquire send receive

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create read write exec append mmap_exec link lock

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unspec unix inet ax25 ipx appletalk netrom bridge atmpvc x25 inet6 rose netbeui security key netlink packet ash econet atmsvc rds sna irda pppox wanpipe llc ib mpls can tipc bluetooth iucv rxrpc isdn phonet ieee802154 caif alg nfc vsock kcm qipcrtr smc xdp

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@ -726,13 +726,44 @@ snap_preseed() {
snap_validate_seed() {
local CHROOT_ROOT=$1
local kern_major_min=undefined
local boot_filename=undefined
# ppc64el still uses /boot/vmlinux so we need to determine the boot file name as non ppc64el use /boot/vmlinuz
# We don't need to query the arch as we can use existence of the file to determine the boot file name. Both
# will never be present at the same time.
if [ -e ${CHROOT_ROOT}/boot/vmlinuz ]; then
boot_filename=vmlinuz
elif [ -e ${CHROOT_ROOT}/boot/vmlinux ]; then
boot_filename=vmlinux
fi
if [ ${boot_filename} != undefined ]; then # we have a known boot file so we can proceed with checking for features to mount
kern_major_min=$(readlink --canonicalize --no-newline ${CHROOT_ROOT}/boot/${boot_filename} | grep --extended-regexp --only-matching --max-count 1 '[0-9]+\.[0-9]+')
if [ -d /usr/share/livecd-rootfs/live-build/apparmor/${kern_major_min} ]; then
# if an Ubuntu version has different kernel apparmor features between LTS and HWE kernels
# a snap pre-seeding issue can occur, where the incorrect apparmor features are reported
# basic copy of a directory structure overriding the "generic" feature set
# which is tied to the LTS kernel
# Bind kernel apparmor directory to feature directory for snap preseeding
umount "${CHROOT_ROOT}/sys/kernel/security/apparmor/features/"
mount --bind /usr/share/livecd-rootfs/live-build/apparmor/${kern_major_min} "${CHROOT_ROOT}/sys/kernel/security/apparmor/features/"
fi
fi
if [ -e "${CHROOT_ROOT}/var/lib/snapd/seed/seed.yaml" ]; then
snap debug validate-seed "${CHROOT_ROOT}/var/lib/snapd/seed/seed.yaml"
/usr/lib/snapd/snap-preseed --reset $(realpath "${CHROOT_ROOT}")
/usr/lib/snapd/snap-preseed $(realpath "${CHROOT_ROOT}")
chroot "${CHROOT_ROOT}" apparmor_parser --skip-read-cache --write-cache --skip-kernel-load --verbose -j `nproc` /etc/apparmor.d
fi
# Unmount kernel specific apparmor feature
# mount generic apparmor feature again (cleanup)
if [ -d /build/config/hooks.d/extra/apparmor/${kern_major_min} ]; then
umount "${CHROOT_ROOT}/sys/kernel/security/apparmor/features/"
mount -o bind /usr/share/livecd-rootfs/live-build/apparmor/generic "${CHROOT_ROOT}/sys/kernel/security/apparmor/features/"
fi
}
snap_from_seed() {

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