Bug 1937664
| Summary: | avc: denied { ioctl } for pid=4033 comm="smbd" path="/proc/1/environ" dev="proc" | ||
|---|---|---|---|
| Product: | [Fedora] Fedora | Reporter: | Bruno Goncalves <bgoncalv> |
| Component: | selinux-policy | Assignee: | Zdenek Pytela <zpytela> |
| Status: | CLOSED DUPLICATE | QA Contact: | Fedora Extras Quality Assurance <extras-qa> |
| Severity: | medium | Docs Contact: | |
| Priority: | medium | ||
| Version: | rawhide | CC: | dwalsh, grepl.miroslav, lvrabec, mmalik, omosnace, plautrba, vmojzis, zpytela |
| Target Milestone: | --- | Keywords: | Triaged |
| Target Release: | --- | ||
| Hardware: | Unspecified | ||
| OS: | Unspecified | ||
| Whiteboard: | |||
| Fixed In Version: | Doc Type: | If docs needed, set a value | |
| Doc Text: | Story Points: | --- | |
| Clone Of: | Environment: | ||
| Last Closed: | 2021-04-07 07:45:20 UTC | Type: | Bug |
| Regression: | --- | Mount Type: | --- |
| Documentation: | --- | CRM: | |
| Verified Versions: | Category: | --- | |
| oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | |
| Cloudforms Team: | --- | Target Upstream Version: | |
| Embargoed: | |||
I was able to reproduce running the test using restraint
1. make sure restraintd service is running in the machine
2. install restraint-client and beakerlib
3. run the test
3.1 test job:
# cat job.xml
<?xml version="1.0" encoding="utf-8"?>
<job>
<recipeSet>
<recipe id="1">
<task name="CIFS Connectathon" role="STANDALONE">
<fetch url="https://gitlab.com/cki-project/kernel-tests/-/archive/main/kernel-tests-main.zip#filesystems/cifs/connectathon"/>
</task>
</recipe>
</recipeSet>
</job>
3.2 restraint -j job.xml -t localhost
4. check avc.log
avc.log will be under job.01 directory
find job.01 -iname avc.log
Bruno, Apart from the denial, is there also some service failing or otherwise negatively affected? Given the permissive=1 in the auditd, do I suppose correctly there are no more denials? The test do pass, the failure is only found when searching for avc errors. here is an example of different test execution https://beaker.engineering.redhat.com/recipes/9695133#task123170056 Bruno,
I gave it a second thought and I think it is rather related to the test or test environment.
Here is the audited event disclosed:
----
type=PROCTITLE msg=audit(03/10/21 08:21:01.439:267) : proctitle=/usr/sbin/smbd --foreground --no-process-group
type=AVC msg=audit(03/10/21 08:21:01.439:267) : avc: denied { ioctl } for pid=4208 comm=smbd path=/proc/1/environ dev="proc" ino=14267 ioctlcmd=TCGETS scontext=system_u:system_r:smbd_t:s0 tcontext=system_u:system_r:init_t:s0 tclass=file permissive=1
type=SYSCALL msg=audit(03/10/21 08:21:01.439:267) : arch=x86_64 syscall=ioctl success=no exit=ENOTTY(Inappropriate ioctl for device) a0=0x19 a1=TCGETS a2=0x7ffdfae331b0 a3=0x1000 items=0 ppid=1 pid=4208 auid=unset uid=root gid=root euid=root suid=root fsuid=root egid=root sgid=root fsgid=root tty=(none) ses=unset comm=smbd exe=/usr/sbin/smbd subj=system_u:system_r:smbd_t:s0 key=(null)
smbd is run in the foreground which I think is not an usual scenario for a daemon.
Isn't this because this is how the service is configured to run? samba-4.14.0-1.fc35.x86_64 # cat /usr/lib/systemd/system/smb.service [Unit] Description=Samba SMB Daemon Documentation=man:smbd(8) man:samba(7) man:smb.conf(5) Wants=network-online.target After=network.target network-online.target nmb.service winbind.service [Service] Type=notify PIDFile=/run/smbd.pid LimitNOFILE=16384 EnvironmentFile=-/etc/sysconfig/samba ExecStart=/usr/sbin/smbd --foreground --no-process-group $SMBDOPTIONS ExecReload=/bin/kill -HUP $MAINPID LimitCORE=infinity Environment=KRB5CCNAME=FILE:/run/samba/krb5cc_samba [Install] WantedBy=multi-user.target *** This bug has been marked as a duplicate of bug 1932689 *** |
Description of problem: During CIFS Connectathon test on CKI this avc denial happens ---- time->Wed Mar 10 02:20:39 2021 type=PROCTITLE msg=audit(1615360839.723:257): proctitle=2F7573722F7362696E2F736D6264002D2D666F726567726F756E64002D2D6E6F2D70726F636573732D67726F7570 type=SYSCALL msg=audit(1615360839.723:257): arch=c000003e syscall=16 success=no exit=-25 a0=19 a1=5401 a2=7ffcb7b21a70 a3=1000 items=0 ppid=1 pid=4033 auid=4294967295 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0 tty=(none) ses=4294967295 comm="smbd" exe="/usr/sbin/smbd" subj=system_u:system_r:smbd_t:s0 key=(null) type=AVC msg=audit(1615360839.723:257): avc: denied { ioctl } for pid=4033 comm="smbd" path="/proc/1/environ" dev="proc" ino=14267 ioctlcmd=0x5401 scontext=system_u:system_r:smbd_t:s0 tcontext=system_u:system_r:init_t:s0 tclass=file permissive=1 ---- time->Wed Mar 10 02:21:01 2021 type=PROCTITLE msg=audit(1615360861.439:267): proctitle=2F7573722F7362696E2F736D6264002D2D666F726567726F756E64002D2D6E6F2D70726F636573732D67726F7570 type=SYSCALL msg=audit(1615360861.439:267): arch=c000003e syscall=16 success=no exit=-25 a0=19 a1=5401 a2=7ffdfae331b0 a3=1000 items=0 ppid=1 pid=4208 auid=4294967295 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0 tty=(none) ses=4294967295 comm="smbd" exe="/usr/sbin/smbd" subj=system_u:system_r:smbd_t:s0 key=(null) type=AVC msg=audit(1615360861.439:267): avc: denied { ioctl } for pid=4208 comm="smbd" path="/proc/1/environ" dev="proc" ino=14267 ioctlcmd=0x5401 scontext=system_u:system_r:smbd_t:s0 tcontext=system_u:system_r:init_t:s0 tclass=file permissive=1 Version-Release number of selected component (if applicable): selinux-policy-3.14.8-4.fc35.noarch How reproducible: not sure yet Steps to Reproduce: 1.Clone the test repo git clone https://gitlab.com/cki-project/kernel-tests.git 2.go the the test directory cd kernel-tests/filesystems/cifs/connectathon 3. install test dependencies dnf install -y wget git samba time patch cups samba-client cifs-utils gcc bzip2 nfs-utils net-tools libnsl2 libtirpc-devel python3-lxml rusers 4. Run the test bash runtest.sh Additional info: SELinux status: enabled SELinuxfs mount: /sys/fs/selinux SELinux root directory: /etc/selinux Loaded policy name: targeted Current mode: permissive Mode from config file: permissive Policy MLS status: enabled Policy deny_unknown status: allowed Memory protection checking: actual (secure) Max kernel policy version: 33 selinux-policy-3.14.8-4.fc35.noarch