Bug 1966492
| Summary: | SELinux prevents systemd-hostnamed from removing the /run/systemd/default-hostname file | ||
|---|---|---|---|
| Product: | Red Hat Enterprise Linux 9 | Reporter: | Jan Stodola <jstodola> |
| Component: | selinux-policy | Assignee: | Zdenek Pytela <zpytela> |
| Status: | CLOSED CURRENTRELEASE | QA Contact: | Milos Malik <mmalik> |
| Severity: | medium | Docs Contact: | |
| Priority: | medium | ||
| Version: | 9.0 | CC: | lvrabec, mmalik, plautrba, pzatko, ssekidde, xiliang |
| Target Milestone: | beta | Keywords: | Triaged |
| Target Release: | 9.0 Beta | ||
| Hardware: | All | ||
| OS: | Linux | ||
| Whiteboard: | |||
| Fixed In Version: | selinux-policy-34.1.7-1.el9 | Doc Type: | No Doc Update |
| Doc Text: | Story Points: | --- | |
| Clone Of: | Environment: | ||
| Last Closed: | 2021-12-07 21:35:16 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: | |||
| Bug Depends On: | |||
| Bug Blocks: | 1942219 | ||
A commit to backport:
commit 517e50b36175e3ded1b195ec589e6bbe6f905797
Author: Zdenek Pytela <zpytela>
Date: Tue May 18 19:17:59 2021 +0200
Label /run/systemd/default-hostname with hostname_etc_t
The /run/systemd/default-hostname file is created by systemd
during boot time and can be removed later by systemd-hostnamed.
Accordingly, the file transition is defined for systemd and
systemd-hostnamed is allowed to delete pid dir entries.
Resolves: rhbz#1953060
Here is the complete SELinux denial caught in enforcing mode:
----
type=PROCTITLE msg=audit(06/02/2021 02:36:16.136:131) : proctitle=/usr/lib/systemd/systemd-hostnamed
type=PATH msg=audit(06/02/2021 02:36:16.136:131) : item=1 name=/run/systemd/default-hostname inode=12 dev=00:19 mode=file,644 ouid=root ogid=root rdev=00:00 obj=system_u:object_r:init_var_run_t:s0 nametype=DELETE cap_fp=none cap_fi=none cap_fe=0 cap_fver=0 cap_frootid=0
type=PATH msg=audit(06/02/2021 02:36:16.136:131) : item=0 name=/run/systemd/ inode=2 dev=00:19 mode=dir,755 ouid=root ogid=root rdev=00:00 obj=system_u:object_r:init_var_run_t:s0 nametype=PARENT cap_fp=none cap_fi=none cap_fe=0 cap_fver=0 cap_frootid=0
type=CWD msg=audit(06/02/2021 02:36:16.136:131) : cwd=/
type=SYSCALL msg=audit(06/02/2021 02:36:16.136:131) : arch=x86_64 syscall=unlink success=no exit=EACCES(Permission denied) a0=0x7f54da792445 a1=0x1 a2=0x7f54da7aff9d a3=0x7f54da5003e0 items=2 ppid=1 pid=580 auid=unset uid=root gid=root euid=root suid=root fsuid=root egid=root sgid=root fsgid=root tty=(none) ses=unset comm=systemd-hostnam exe=/usr/lib/systemd/systemd-hostnamed subj=system_u:system_r:systemd_hostnamed_t:s0 key=(null)
type=AVC msg=audit(06/02/2021 02:36:16.136:131) : avc: denied { write } for pid=580 comm=systemd-hostnam name=systemd dev="tmpfs" ino=2 scontext=system_u:system_r:systemd_hostnamed_t:s0 tcontext=system_u:object_r:init_var_run_t:s0 tclass=dir permissive=0
----
# ls -lZ /run/systemd/default-hostname
-rw-r--r--. 1 root root system_u:object_r:init_var_run_t:s0 10 Jun 2 02:36 /run/systemd/default-hostname
#
Here are SELinux denials caught in permissive mode:
----
type=PROCTITLE msg=audit(06/02/2021 02:41:36.291:130) : proctitle=/usr/lib/systemd/systemd-hostnamed
type=PATH msg=audit(06/02/2021 02:41:36.291:130) : item=1 name=/run/systemd/default-hostname inode=12 dev=00:19 mode=file,644 ouid=root ogid=root rdev=00:00 obj=system_u:object_r:init_var_run_t:s0 nametype=DELETE cap_fp=none cap_fi=none cap_fe=0 cap_fver=0 cap_frootid=0
type=PATH msg=audit(06/02/2021 02:41:36.291:130) : item=0 name=/run/systemd/ inode=2 dev=00:19 mode=dir,755 ouid=root ogid=root rdev=00:00 obj=system_u:object_r:init_var_run_t:s0 nametype=PARENT cap_fp=none cap_fi=none cap_fe=0 cap_fver=0 cap_frootid=0
type=CWD msg=audit(06/02/2021 02:41:36.291:130) : cwd=/
type=SYSCALL msg=audit(06/02/2021 02:41:36.291:130) : arch=x86_64 syscall=unlink success=yes exit=0 a0=0x7f334a5ac445 a1=0x1 a2=0x7f334a5c9f9d a3=0x7f334a31a3e0 items=2 ppid=1 pid=580 auid=unset uid=root gid=root euid=root suid=root fsuid=root egid=root sgid=root fsgid=root tty=(none) ses=unset comm=systemd-hostnam exe=/usr/lib/systemd/systemd-hostnamed subj=system_u:system_r:systemd_hostnamed_t:s0 key=(null)
type=AVC msg=audit(06/02/2021 02:41:36.291:130) : avc: denied { unlink } for pid=580 comm=systemd-hostnam name=default-hostname dev="tmpfs" ino=12 scontext=system_u:system_r:systemd_hostnamed_t:s0 tcontext=system_u:object_r:init_var_run_t:s0 tclass=file permissive=1
type=AVC msg=audit(06/02/2021 02:41:36.291:130) : avc: denied { remove_name } for pid=580 comm=systemd-hostnam name=default-hostname dev="tmpfs" ino=12 scontext=system_u:system_r:systemd_hostnamed_t:s0 tcontext=system_u:object_r:init_var_run_t:s0 tclass=dir permissive=1
type=AVC msg=audit(06/02/2021 02:41:36.291:130) : avc: denied { write } for pid=580 comm=systemd-hostnam name=systemd dev="tmpfs" ino=2 scontext=system_u:system_r:systemd_hostnamed_t:s0 tcontext=system_u:object_r:init_var_run_t:s0 tclass=dir permissive=1
----
*** Bug 1978507 has been marked as a duplicate of this bug. *** |
Description of problem: The following AVC is found on the system after the default package set installation (Server with GUI) and booting the installed system: type=AVC msg=audit(1622539307.512:194): avc: denied { write } for pid=885 comm="systemd-hostnam" name="systemd" dev="tmpfs" ino=2 scontext=system_u:system_r:systemd_hostnamed_t:s0 tcontext=system_u:object_r:init_var_run_t:s0 tclass=dir permissive=0 Version-Release number of selected component (if applicable): RHEL-9.0.0-20210531.2 selinux-policy-34.1.5-1.el9 systemd-248-5.el9 How reproducible: always Steps to Reproduce: 1. Run the default package set installation 2. Login to the installed system, check /var/log/audit/audit.log Actual results: avc: denied { write } for pid=885 comm="systemd-hostnam" Expected results: No "systemd-hostnam" related denial.