RHEL Engineering is moving the tracking of its product development work on RHEL 6 through RHEL 9 to Red Hat Jira (issues.redhat.com). If you're a Red Hat customer, please continue to file support cases via the Red Hat customer portal. If you're not, please head to the "RHEL project" in Red Hat Jira and file new tickets here. Individual Bugzilla bugs in the statuses "NEW", "ASSIGNED", and "POST" are being migrated throughout September 2023. Bugs of Red Hat partners with an assigned Engineering Partner Manager (EPM) are migrated in late September as per pre-agreed dates. Bugs against components "kernel", "kernel-rt", and "kpatch" are only migrated if still in "NEW" or "ASSIGNED". If you cannot log in to RH Jira, please consult article #7032570. That failing, please send an e-mail to the RH Jira admins at rh-issues@redhat.com to troubleshoot your issue as a user management inquiry. The email creates a ServiceNow ticket with Red Hat. Individual Bugzilla bugs that are migrated will be moved to status "CLOSED", resolution "MIGRATED", and set with "MigratedToJIRA" in "Keywords". The link to the successor Jira issue will be found under "Links", have a little "two-footprint" icon next to it, and direct you to the "RHEL project" in Red Hat Jira (issue links are of type "https://issues.redhat.com/browse/RHEL-XXXX", where "X" is a digit). This same link will be available in a blue banner at the top of the page informing you that that bug has been migrated.
Bug 1895322 - rhsmcertd_t needs to execute kpatch (kpatch_exec_t)
Summary: rhsmcertd_t needs to execute kpatch (kpatch_exec_t)
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Red Hat Enterprise Linux 8
Classification: Red Hat
Component: selinux-policy
Version: 8.3
Hardware: All
OS: Linux
high
high
Target Milestone: rc
: 8.4
Assignee: Zdenek Pytela
QA Contact: Milos Malik
URL:
Whiteboard:
: 1894527 1925643 1925811 1927844 (view as bug list)
Depends On:
Blocks: 1122832
TreeView+ depends on / blocked
 
Reported: 2020-11-06 10:39 UTC by Renaud Métrich
Modified: 2024-03-25 16:58 UTC (History)
20 users (show)

Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Cause: A new "kpatch fact" feature in subscription-manager in RHEL 8.3 requires to execute the kpatch command. As this is a newly requested permission, it was not presnet in the policy. Consequence: Subscription manager fails to execute kpatch and keeps reporting a problem. Fix: Add the permission to execute kpatch with a transition. Result: The kpatch fact in the subscription manager works as expected.
Clone Of:
Environment:
Last Closed: 2021-05-18 14:58:17 UTC
Type: Bug
Target Upstream Version:
Embargoed:
arpandey: needinfo-

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Bugzilla 1761566 0 unspecified CLOSED [RFE] Collect kernel patch version version in facts 2023-04-20 15:20:45 UTC
Red Hat Knowledge Base (Solution) 5554231 0 None None None 2020-11-06 15:35:54 UTC

Description Renaud Métrich 2020-11-06 10:39:38 UTC 
Description of problem:

With RHEL 8.3, subscription-manager comes with a "kpatch" fact /usr/lib64/python3.6/site-packages/rhsmlib/facts/kpatch.py which internally checks if /usr/sbin/kpatch exists (requires "getattr") and then executes it later (requires "execute").

This requires a policy update:

AVCs:
-------- 8< ---------------- 8< ---------------- 8< ---------------- 8< --------
avc:  denied  { getattr } for  pid=192521 comm=rhsmcertd-worke path=/usr/sbin/kpatch dev="dm-0" ino=2185345 scontext=system_u:system_r:rhsmcertd_t:s0 tcontext=system_u:object_r:kpatch_exec_t:s0 tclass=file permissive=1
avc:  denied  { execute } for  pid=192521 comm=rhsmcertd-worke name=kpatch dev="dm-0" ino=2185345 scontext=system_u:system_r:rhsmcertd_t:s0 tcontext=system_u:object_r:kpatch_exec_t:s0 tclass=file permissive=1
-------- 8< ---------------- 8< ---------------- 8< ---------------- 8< --------

Missing CIL rule:
-------- 8< ---------------- 8< ---------------- 8< ---------------- 8< --------
(allow rhsmcertd_t kpatch_exec_t (file (getattr execute)))
-------- 8< ---------------- 8< ---------------- 8< ---------------- 8< --------


Version-Release number of selected component (if applicable):

selinux-policy-3.14.3-54.el8.noarch
subscription-manager-1.27.16-1.el8.x86_64

How reproducible:

No idea, 100% by the customer.

Additional info:

I requested SysMgmt to explain when this fact is triggered.
Comment 1 Milos Malik 2020-11-06 15:07:26 UTC 
It seems that following bug contains the reproducer:
 * https://bugzilla.redhat.com/show_bug.cgi?id=1894527
Comment 3 Milos Malik 2020-11-11 08:13:48 UTC 
The reproducer triggers the following SELinux denial enforcing mode:
----
type=PROCTITLE msg=audit(11/11/2020 09:10:12.218:3095) : proctitle=/usr/libexec/platform-python /usr/libexec/rhsmcertd-worker 
type=PATH msg=audit(11/11/2020 09:10:12.218:3095) : item=0 name=/usr/sbin/kpatch inode=8727282 dev=08:02 mode=file,755 ouid=root ogid=root rdev=00:00 obj=system_u:object_r:kpatch_exec_t:s0 nametype=NORMAL cap_fp=none cap_fi=none cap_fe=0 cap_fver=0 cap_frootid=0 
type=CWD msg=audit(11/11/2020 09:10:12.218:3095) : cwd=/ 
type=SYSCALL msg=audit(11/11/2020 09:10:12.218:3095) : arch=x86_64 syscall=stat success=no exit=EACCES(Permission denied) a0=0x7fb7e7e576e0 a1=0x7ffc5aa003b0 a2=0x7ffc5aa003b0 a3=0x1 items=1 ppid=311622 pid=312331 auid=unset uid=root gid=root euid=root suid=root fsuid=root egid=root sgid=root fsgid=root tty=(none) ses=unset comm=rhsmcertd-worke exe=/usr/libexec/platform-python3.6 subj=system_u:system_r:rhsmcertd_t:s0 key=(null) 
type=AVC msg=audit(11/11/2020 09:10:12.218:3095) : avc:  denied  { getattr } for  pid=312331 comm=rhsmcertd-worke path=/usr/sbin/kpatch dev="sda2" ino=8727282 scontext=system_u:system_r:rhsmcertd_t:s0 tcontext=system_u:object_r:kpatch_exec_t:s0 tclass=file permissive=0 
----

The reproducer triggers following SELinux denials in permissive mode:
----
type=PROCTITLE msg=audit(11/11/2020 09:11:35.820:3100) : proctitle=/usr/libexec/platform-python /usr/libexec/rhsmcertd-worker 
type=PATH msg=audit(11/11/2020 09:11:35.820:3100) : item=0 name=/usr/sbin/kpatch inode=8727282 dev=08:02 mode=file,755 ouid=root ogid=root rdev=00:00 obj=system_u:object_r:kpatch_exec_t:s0 nametype=NORMAL cap_fp=none cap_fi=none cap_fe=0 cap_fver=0 cap_frootid=0 
type=CWD msg=audit(11/11/2020 09:11:35.820:3100) : cwd=/ 
type=SYSCALL msg=audit(11/11/2020 09:11:35.820:3100) : arch=x86_64 syscall=stat success=yes exit=0 a0=0x7fd25b224718 a1=0x7fff8c3f35c0 a2=0x7fff8c3f35c0 a3=0x1 items=1 ppid=311622 pid=312790 auid=unset uid=root gid=root euid=root suid=root fsuid=root egid=root sgid=root fsgid=root tty=(none) ses=unset comm=rhsmcertd-worke exe=/usr/libexec/platform-python3.6 subj=system_u:system_r:rhsmcertd_t:s0 key=(null) 
type=AVC msg=audit(11/11/2020 09:11:35.820:3100) : avc:  denied  { getattr } for  pid=312790 comm=rhsmcertd-worke path=/usr/sbin/kpatch dev="sda2" ino=8727282 scontext=system_u:system_r:rhsmcertd_t:s0 tcontext=system_u:object_r:kpatch_exec_t:s0 tclass=file permissive=1 
----
type=PROCTITLE msg=audit(11/11/2020 09:11:35.827:3101) : proctitle=/usr/libexec/platform-python /usr/libexec/rhsmcertd-worker 
type=PATH msg=audit(11/11/2020 09:11:35.827:3101) : item=0 name=/usr/sbin/kpatch inode=8727282 dev=08:02 mode=file,755 ouid=root ogid=root rdev=00:00 obj=system_u:object_r:kpatch_exec_t:s0 nametype=NORMAL cap_fp=none cap_fi=none cap_fe=0 cap_fver=0 cap_frootid=0 
type=CWD msg=audit(11/11/2020 09:11:35.827:3101) : cwd=/ 
type=SYSCALL msg=audit(11/11/2020 09:11:35.827:3101) : arch=x86_64 syscall=access success=yes exit=0 a0=0x7fd25b224718 a1=X_OK a2=0x0 a3=0x2 items=1 ppid=311622 pid=312790 auid=unset uid=root gid=root euid=root suid=root fsuid=root egid=root sgid=root fsgid=root tty=(none) ses=unset comm=rhsmcertd-worke exe=/usr/libexec/platform-python3.6 subj=system_u:system_r:rhsmcertd_t:s0 key=(null) 
type=AVC msg=audit(11/11/2020 09:11:35.827:3101) : avc:  denied  { execute } for  pid=312790 comm=rhsmcertd-worke name=kpatch dev="sda2" ino=8727282 scontext=system_u:system_r:rhsmcertd_t:s0 tcontext=system_u:object_r:kpatch_exec_t:s0 tclass=file permissive=1 
----
type=PROCTITLE msg=audit(11/11/2020 09:11:35.827:3102) : proctitle=/usr/libexec/platform-python /usr/libexec/rhsmcertd-worker 
type=PATH msg=audit(11/11/2020 09:11:35.827:3102) : item=0 name=/var/lib/kpatch inode=6415 dev=08:02 mode=dir,755 ouid=root ogid=root rdev=00:00 obj=system_u:object_r:kpatch_var_lib_t:s0 nametype=NORMAL cap_fp=none cap_fi=none cap_fe=0 cap_fver=0 cap_frootid=0 
type=CWD msg=audit(11/11/2020 09:11:35.827:3102) : cwd=/ 
type=SYSCALL msg=audit(11/11/2020 09:11:35.827:3102) : arch=x86_64 syscall=openat success=yes exit=8 a0=0xffffff9c a1=0x7fd259d31b30 a2=O_RDONLY|O_NONBLOCK|O_DIRECTORY|O_CLOEXEC a3=0x0 items=1 ppid=311622 pid=312790 auid=unset uid=root gid=root euid=root suid=root fsuid=root egid=root sgid=root fsgid=root tty=(none) ses=unset comm=rhsmcertd-worke exe=/usr/libexec/platform-python3.6 subj=system_u:system_r:rhsmcertd_t:s0 key=(null) 
type=AVC msg=audit(11/11/2020 09:11:35.827:3102) : avc:  denied  { read } for  pid=312790 comm=rhsmcertd-worke name=kpatch dev="sda2" ino=6415 scontext=system_u:system_r:rhsmcertd_t:s0 tcontext=system_u:object_r:kpatch_var_lib_t:s0 tclass=dir permissive=1
----
Comment 7 Rehana 2020-11-12 16:42:57 UTC 
*** Bug 1894527 has been marked as a duplicate of this bug. ***
Comment 11 Zdenek Pytela 2021-01-05 17:34:12 UTC 
I've submitted a Fedora PR to address the issue:
https://github.com/fedora-selinux/selinux-policy/pull/529

Milosi,
kpatch is used to gather information only, so I went the can_exec way, i. e. no test change is required.

Archana Pandey,
will you be able to verify the fix is sufficient once we have a RHEL build?
Comment 24 Zdenek Pytela 2021-02-05 19:15:06 UTC 
*** Bug 1925643 has been marked as a duplicate of this bug. ***
Comment 28 Zdenek Pytela 2021-02-11 16:42:54 UTC 
*** Bug 1927844 has been marked as a duplicate of this bug. ***
Comment 34 Rehana 2021-02-16 14:54:47 UTC 
*** Bug 1925811 has been marked as a duplicate of this bug. ***
Comment 36 errata-xmlrpc 2021-05-18 14:58:17 UTC 
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory (selinux-policy bug fix and enhancement update), and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2021:1639
Note You need to log in before you can comment on or make changes to this bug.