From: Yumei Huang <yuhuang@redhat.com>
To: Stefano Brivio <sbrivio@redhat.com>
Cc: passt-dev@passt.top, david@gibson.dropbear.id.au
Subject: Re: [PATCH] test: Update README.md
Date: Tue, 23 Sep 2025 15:16:32 +0800 [thread overview]
Message-ID: <CANsz47mG6XZP_2eoAwvycaBcfoYSDf2S8VriEh6=Wa2rRMGbHQ@mail.gmail.com> (raw)
In-Reply-To: <CANsz47=+VOeYNYuLOD3TdhQiO_5q1b9od0Ef6xNGUSrthocXSg@mail.gmail.com>
[-- Attachment #1: Type: text/plain, Size: 9110 bytes --]
On Tue, Sep 23, 2025 at 2:36 PM Yumei Huang <yuhuang@redhat.com> wrote:
>
> On Tue, Sep 23, 2025 at 4:03 AM Stefano Brivio <sbrivio@redhat.com> wrote:
> >
> > On Mon, 22 Sep 2025 11:03:23 +0800
> > Yumei Huang <yuhuang@redhat.com> wrote:
> >
> > > On Fri, Sep 19, 2025 at 5:58 PM Stefano Brivio <sbrivio@redhat.com> wrote:
> > > >
> > > > On Fri, 19 Sep 2025 09:43:29 +0800
> > > > Yumei Huang <yuhuang@redhat.com> wrote:
> > > >
> > > > > Signed-off-by: Yumei Huang <yuhuang@redhat.com>
> > > > > ---
> > > > > test/README.md | 31 +++++++++++++++++++++++++++++--
> > > > > 1 file changed, 29 insertions(+), 2 deletions(-)
> > > > >
> > > > > diff --git a/test/README.md b/test/README.md
> > > > > index 91ca603..e3e9d37 100644
> > > > > --- a/test/README.md
> > > > > +++ b/test/README.md
> > > > > @@ -32,7 +32,7 @@ Example for Debian, and possibly most Debian-based distributions:
> > > > > git go iperf3 isc-dhcp-common jq libgpgme-dev libseccomp-dev linux-cpupower
> > > > > lm-sensors lz4 netavark netcat-openbsd psmisc qemu-efi-aarch64
> > > > > qemu-system-arm qemu-system-misc qemu-system-ppc qemu-system-x86
> > > > > - qemu-system-x86 sipcalc socat strace tmux uidmap valgrind
> > > > > + sipcalc socat strace tmux uidmap valgrind
> > > > >
> > > > > NOTE: the tests need a qemu version >= 7.2, or one that contains commit
> > > > > 13c6be96618c ("net: stream: add unix socket"): this change introduces support
> > > > > @@ -81,7 +81,12 @@ The following additional packages are commonly needed:
> > > > >
> > > > > ## Regular test
> > > > >
> > > > > -Just issue:
> > > > > +Before running the tests, you need to prepare the required assets:
> > > > > +
> > > > > + cd test
> > > > > + make assets
> > > > > +
> > > > > +Then issue:
> > > > >
> > > > > ./run
> > > > >
> > > > > @@ -91,6 +96,28 @@ variable settings: DEBUG=1 enables debugging messages, TRACE=1 enables tracing
> > > > >
> > > > > PCAP=1 TRACE=1 ./run
> > > > >
> > > > > +**Note:**
> > > > > +
> > > > > +* It's recommended to run the commands as a non-root user.
> > > > > + Due to [Bug 967509](https://bugzilla.redhat.com/show_bug.cgi?id=967509),
> > > > > + if you switch users with `su` or `sudo`, the directory `/run/user/ID` may
> > > > > + not be created. In that case, `XDG_RUNTIME_DIR` will incorrectly point to
> > > > > + `/run/user/0` instead of `/run/user/ID`, which can cause error.
> > > >
> > > > Thanks for the research, I wasn't aware of that, and recently spent
> > > > quite some time figuring that out (for other reasons):
> > > >
> > > > https://issues.redhat.com/browse/RHEL-70222
> > > >
> > > > in that case, XDG_RUNTIME_DIR was simply not set. Things were working
> > > > with 'machinectl shell' instead.
> > > >
> > > > At the same time: running this whole stuff as root sounds rather crazy,
> > > > unless it's a throw-away VMs with absolutely nothing important on it.
> > > >
> > > > That is, regardless of the issue with XDG_RUNTIME_DIR. I would maybe
> > > > make the wording stronger, something like:
> > > >
> > > > * Don't run the tests as root, it's not needed!
> > > > * If you really need to, note that ...
> > > >
> > > > > + **Workaround:** Log out and log back in as the intended user to ensure the
> > > > > + correct runtime directory is set up.
> > > >
> > > > We could also suggest 'machinectl shell' if it's really needed for
> > > > whatever reason.
> > >
> > > I'm not sure how 'machinectl shell' works here. The error happens when
> > > running 'make assets',
> > > which calls 'prepare-distro-img.sh' script, which calls 'virsh edit'.
> >
> > Ah, I didn't know! So this is actually similar to
> > https://issues.redhat.com/browse/RHEL-70222.
> >
> > > If we run 'make assets' with root, the error is like this:
> > >
> > > ./prepare-distro-img.sh prepared-debian-8.11.0-openstack-amd64.qcow2
> > > libguestfs: error: could not create appliance through libvirt.
> > > Original error from libvirt: Cannot access storage file
> > > '/home/test/passt/test/prepared-debian-8.11.0-openstack-amd64.qcow2'
> > > (as uid:107, gid:107): Permission denied [code=38 int1=13]
> > >
> > > If we switch to a non-root user via 'su', the error is like this:
> > >
> > > ./prepare-distro-img.sh prepared-debian-8.11.0-openstack-amd64.qcow2
> > > libvirt: XML-RPC error : Cannot create user runtime directory
> > > '/run/user/0/libvirt': Permission denied
> > > libguestfs: error: could not connect to libvirt (URI =
> > > qemu:///session): Cannot create user runtime directory
> > > '/run/user/0/libvirt': Permission denied [code=38 int1=13]
> > > make: *** [Makefile:115: prepared-debian-8.11.0-openstack-amd64.qcow2] Error 1
> > >
> > > Do you mean to run 'make assets' with 'machinectl shell'? What's the
> > > exact cmd here? I tried this, seems not work.
> > >
> > > # machinectl shell --uid=$(id -u pat) .host
> > > /home/test/passt/test/make assets
> > > Connected to the local host. Press ^] three times within 1s to exit session.
> > >
> > > Connection to the local host terminated.
> >
> > No, I mean using 'machinectl shell' instead of 'su' (it's intended as a
> > replacement), that is:
> >
> > $ machinectl shell
> > # make assets
> >
> > ...because that one will set XDG_RUNTIME_DIR.
>
> Yes, 'machinectl shell' will solve the issue when switching to a
> non-root user via su. But it doesn't solve the issue when running
> 'make assets' as root. They are actually different issues as above.
> Maybe we can just put it like:
>
> Running the commands as root is just not allowed. If you login
> the system with root, don't use su to switch users due to [Bug
> 967509](https://bugzilla.redhat.com/show_bug.cgi?id=967509). Log out
> and log back in as the intended user, or use 'machinectl shell
> --uid=$user'.
>
> What do you think?
> >
> > > > > +* SELinux may prevent the tests from running correctly. To avoid this,
> > > > > + temporarily disable it by running:
> > > > > +
> > > > > + setenforce 0
> > > >
> > > > By the way, other than the DHCP client not working on Fedora in a
> > > > namespace (which we should really fix, I can look into it if you share
> > > > the messages you're getting from /var/log/audit/audit.log), did you hit
> > > > any other issue with it?
> > > >
> > >
> > > Sure, I will send you a link containing the audit.log.
> > > BTW, if 'setenforce 1', the tests would get stuck at 'DHCPv6
> > > :address'. Looks like an endless loop there. So except the very first
> > > few tests, other tests haven't been executed.
> > >
> > > === pasta/dhcp
> > > DEBUG:DEBUG:DEBUG:DEBUG:DEBUG:DEBUG:DEBUG:DEBUG:DEBUG:DEBUG:DEBUG:DEBUG:DEBUG:DEBUG:DEBUG:DEBUG:DEBUG:>
> > > Interface name
> > > DEBUG:DEBUG:? [ -n "eno8303" ]
> > > DEBUG:DEBUG:...passed.
> > >
> > > > DHCP: address
> > > DEBUG:DEBUG:DEBUG:DEBUG:? [ @EMPTY@ = 10.72.136.30 ] < failed.
> > > DEBUG:DEBUG:...failed.
> > >
> > > > DHCP: route
> > > DEBUG:DEBUG:DEBUG:? [ @EMPTY@ = 10.72.139.254 ] < failed.
> > > DEBUG:DEBUG:...failed.
> > >
> > > > DHCP: MTU
> > > DEBUG:DEBUG:? [ 1500 = 65520 ] < failed.
> > > DEBUG:DEBUG:...failed.
> > >
> > > > DHCPv6: address
> > > DEBUG:
> >
> > Thanks, so it's the issue David recently mentioned with
> > dhclient-script(8) being prevented by SELinux from setting up addresses
> > and routes via ip(8), even though it's in a detached namespace and that
> > should be allowed.
> >
> > We should probably add something like we do in contrib/selinux/pasta.te
> > to https://github.com/fedora-selinux/selinux-policy:
> >
> > roleattribute user_r usernetctl_roles;
> > role usernetctl_roles types <whatever dhclient runs as>;
> >
> > Now, we can disable SELinux temporarily to run tests, but eventually
> > we'll want to have tests with DHCP clients in unprivileged setups also
> > as part of Fedora automated tests, and I'm fairly sure that those run
> > with SELinux in enforcing mode. So we should really fix this.
>
> Sure, I will file a ticket for that.
> >
> > By the way, it would also be interesting to see if, once the test suite
> > gets past this point, you get further messages in audit.log.
> >
> > If you do 'setenforce 0', SELinux switches to the so-called "complain
> > mode", and warnings are still logged, but they won't block anything.
> >
> > So, with 'setenforce 0', we can find out from audit.log if we would hit
> > further failures.
>
> Here is the audit.log:
>
> https://privatebin.corp.redhat.com/?49fef5ef2e766c42#Fki5LnD9EGMfDDpmvFPp1WqGbQPwQk4qQmQbmKugDLxb
Sorry for the wrong link. Attached the log.
>
> From what I can see, there is no 'avc: denied' after the dhcp cases.
>
> >
> > Maybe also relevant:
> >
> > https://github.com/fedora-selinux/selinux-policy/pull/1838
> >
> > ...but it's not being merged for some reason.
> >
> > --
> > Stefano
> >
>
>
> --
> Thanks,
>
> Yumei Huang
--
Thanks,
Yumei Huang
[-- Attachment #2: audit.log --]
[-- Type: text/x-log, Size: 12624 bytes --]
type=AVC msg=audit(1758607564.171:14359): avc: denied { append } for pid=3229241 comm="dhclient" path="/tmp/passt-tests-HbjFSR/pasta/context_ns.stdout.0UOHzZBw" dev="tmpfs" ino=120034 scontext=unconfined_u:system_r:dhcpc_t:s0-s0:c0.c1023 tcontext=unconfined_u:object_r:user_tmp_t:s0 tclass=fifo_file permissive=1
type=AVC msg=audit(1758607564.174:14360): avc: denied { dac_override } for pid=3229242 comm="dhclient" capability=1 scontext=unconfined_u:system_r:dhcpc_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:dhcpc_t:s0-s0:c0.c1023 tclass=cap_userns permissive=1
type=AVC msg=audit(1758607564.176:14361): avc: denied { ioctl } for pid=3229245 comm="dhclient-script" path="/tmp/passt-tests-HbjFSR/pasta/context_ns.stderr.xIrFAMG9" dev="tmpfs" ino=120035 ioctlcmd=0x540f scontext=unconfined_u:system_r:dhcpc_t:s0-s0:c0.c1023 tcontext=unconfined_u:object_r:user_tmp_t:s0 tclass=fifo_file permissive=1
type=AVC msg=audit(1758607564.177:14362): avc: denied { dac_read_search } for pid=3229245 comm="dhclient-script" capability=2 scontext=unconfined_u:system_r:dhcpc_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:dhcpc_t:s0-s0:c0.c1023 tclass=cap_userns permissive=1
type=AVC msg=audit(1758607564.183:14363): avc: denied { net_admin } for pid=3229249 comm="ip" capability=12 scontext=unconfined_u:system_r:ifconfig_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:ifconfig_t:s0-s0:c0.c1023 tclass=cap_userns permissive=1
type=AVC msg=audit(1758607564.184:14364): avc: denied { net_raw } for pid=3229242 comm="dhclient" capability=13 scontext=unconfined_u:system_r:dhcpc_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:dhcpc_t:s0-s0:c0.c1023 tclass=cap_userns permissive=1
type=AVC msg=audit(1758607564.203:14365): avc: denied { net_raw } for pid=3229256 comm="arping" capability=13 scontext=unconfined_u:system_r:netutils_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:netutils_t:s0-s0:c0.c1023 tclass=cap_userns permissive=1
type=AVC msg=audit(1758607569.463:14366): avc: denied { ioctl } for pid=3230417 comm="dhclient-script" path="/tmp/passt-tests-HbjFSR/pasta/context_ns.stderr.xiplKRwD" dev="tmpfs" ino=120047 ioctlcmd=0x540f scontext=unconfined_u:system_r:dhcpc_t:s0-s0:c0.c1023 tcontext=unconfined_u:object_r:user_tmp_t:s0 tclass=fifo_file permissive=1
type=SERVICE_STOP msg=audit(1758607587.938:14367): pid=1 uid=0 auid=4294967295 ses=4294967295 subj=system_u:system_r:init_t:s0 msg='unit=systemd-hostnamed comm="systemd" exe="/usr/lib/systemd/systemd" hostname=? addr=? terminal=? res=success'UID="root" AUID="unset"
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type=BPF msg=audit(1758608533.642:14436): prog-id=636 op=LOAD
type=BPF msg=audit(1758608533.642:14437): prog-id=637 op=LOAD
type=SERVICE_START msg=audit(1758608533.685:14438): pid=1 uid=0 auid=4294967295 ses=4294967295 subj=system_u:system_r:init_t:s0 msg='unit=systemd-hostnamed comm="systemd" exe="/usr/lib/systemd/systemd" hostname=? addr=? terminal=? res=success'UID="root" AUID="unset"
type=SERVICE_STOP msg=audit(1758608563.722:14439): pid=1 uid=0 auid=4294967295 ses=4294967295 subj=system_u:system_r:init_t:s0 msg='unit=systemd-hostnamed comm="systemd" exe="/usr/lib/systemd/systemd" hostname=? addr=? terminal=? res=success'UID="root" AUID="unset"
type=BPF msg=audit(1758608563.776:14440): prog-id=635 op=UNLOAD
type=SERVICE_START msg=audit(1758608676.825:14441): pid=1 uid=0 auid=4294967295 ses=4294967295 subj=system_u:system_r:init_t:s0 msg='unit=dnf-makecache comm="systemd" exe="/usr/lib/systemd/systemd" hostname=? addr=? terminal=? res=success'UID="root" AUID="unset"
type=SERVICE_STOP msg=audit(1758608676.825:14442): pid=1 uid=0 auid=4294967295 ses=4294967295 subj=system_u:system_r:init_t:s0 msg='unit=dnf-makecache comm="systemd" exe="/usr/lib/systemd/systemd" hostname=? addr=? terminal=? res=success'UID="root" AUID="unset"
type=BPF msg=audit(1758608995.196:14443): prog-id=637 op=UNLOAD
type=BPF msg=audit(1758608995.196:14444): prog-id=636 op=UNLOAD
type=BPF msg=audit(1758608995.221:14445): prog-id=638 op=LOAD
type=BPF msg=audit(1758608995.222:14446): prog-id=639 op=LOAD
type=BPF msg=audit(1758608995.222:14447): prog-id=640 op=LOAD
type=SERVICE_START msg=audit(1758608995.270:14448): pid=1 uid=0 auid=4294967295 ses=4294967295 subj=system_u:system_r:init_t:s0 msg='unit=systemd-hostnamed comm="systemd" exe="/usr/lib/systemd/systemd" hostname=? addr=? terminal=? res=success'UID="root" AUID="unset"
type=SERVICE_STOP msg=audit(1758609025.308:14449): pid=1 uid=0 auid=4294967295 ses=4294967295 subj=system_u:system_r:init_t:s0 msg='unit=systemd-hostnamed comm="systemd" exe="/usr/lib/systemd/systemd" hostname=? addr=? terminal=? res=success'UID="root" AUID="unset"
type=BPF msg=audit(1758609025.362:14450): prog-id=638 op=UNLOAD
next prev parent reply other threads:[~2025-09-23 7:16 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-09-19 1:43 Yumei Huang
2025-09-19 5:00 ` David Gibson
2025-09-19 9:58 ` Stefano Brivio
2025-09-22 3:03 ` Yumei Huang
2025-09-22 20:03 ` Stefano Brivio
2025-09-23 6:36 ` Yumei Huang
2025-09-23 7:16 ` Yumei Huang [this message]
2025-09-23 10:32 ` Stefano Brivio
2025-09-24 1:58 ` David Gibson
2025-09-24 1:58 ` Yumei Huang
2025-09-24 3:44 ` David Gibson
2025-09-24 4:02 ` Yumei Huang
2025-09-24 8:46 ` Stefano Brivio
2025-09-24 8:56 ` Richard W.M. Jones
2025-09-24 9:09 ` Stefano Brivio
2025-09-24 10:31 ` Richard W.M. Jones
2025-09-24 11:00 ` Daniel P. Berrangé
2025-09-25 9:21 ` Richard W.M. Jones
2025-09-24 11:05 ` Stefano Brivio
2025-09-24 11:20 ` Daniel P. Berrangé
2025-09-24 11:48 ` Stefano Brivio
2025-09-25 5:16 ` Yumei Huang
2025-09-23 7:49 ` David Gibson
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