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If libvirtd is triggered by an unprivileged user, the virt-aa-helper mechanism doesn't work, because per-VM profiles can't be instantiated, and as a result libvirtd runs unconfined. This means passt can't start, because the passt subprofile from libvirt's profile is not loaded either. Example: $ virsh start alpine error: Failed to start domain 'alpine' error: internal error: Child process (passt --one-off --socket /run/user/1000/libvirt/qemu/run/passt/1-alpine-net0.socket --pid /run/user/1000/libvirt/qemu/run/passt/1-alpine-net0-passt.pid --tcp-ports 40922:2) unexpected fatal signal 11 Add an annoying workaround for the moment being. Much better than encouraging users to start guests as root, or to disable AppArmor altogether. Reported-by: Prafulla Giri <prafulla.giri@protonmail.com> Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
52 lines
1.9 KiB
Plaintext
52 lines
1.9 KiB
Plaintext
# SPDX-License-Identifier: GPL-2.0-or-later
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#
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# PASST - Plug A Simple Socket Transport
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# for qemu/UNIX domain socket mode
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#
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# PASTA - Pack A Subtle Tap Abstraction
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# for network namespace/tap device mode
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#
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# contrib/apparmor/usr.bin.passt - AppArmor profile for passt(1)
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#
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# Copyright (c) 2022 Red Hat GmbH
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# Author: Stefano Brivio <sbrivio@redhat.com>
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abi <abi/3.0>,
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include <tunables/global>
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profile passt /usr/bin/passt{,.avx2} {
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include <abstractions/passt>
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# Alternatively: include <abstractions/user-tmp>
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owner /tmp/** w, # tap_sock_unix_open(),
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# tap_sock_unix_init(), pcap(),
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# pidfile_open(),
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# pidfile_write(),
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# logfile_init()
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owner @{HOME}/** w, # pcap(), pidfile_open(),
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# pidfile_write()
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# Workaround: libvirt's profile comes with a passt subprofile which includes,
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# in turn, <abstractions/passt>, and adds libvirt-specific rules on top, to
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# allow passt (when started by libvirtd) to write socket and PID files in the
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# location requested by libvirtd itself, and to execute passt itself.
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#
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# However, when libvirt runs as unprivileged user, the mechanism based on
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# virt-aa-helper, designed to build per-VM profiles as guests are started,
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# doesn't work. The helper needs to create and load profiles on the fly, which
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# can't be done by unprivileged users, of course.
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#
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# As a result, libvirtd runs unconfined if guests are started by unprivileged
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# users, starting passt unconfined as well, which means that passt runs under
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# its own stand-alone profile (this one), which implies in turn that execve()
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# of /usr/bin/passt is not allowed, and socket and PID files can't be written.
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#
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# Duplicate libvirt-specific rules here as long as this is not solved in
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# libvirt's profile itself.
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/usr/bin/passt r,
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owner @{run}/user/[0-9]*/libvirt/qemu/run/passt/* rw,
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owner @{run}/libvirt/qemu/passt/* rw,
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}
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