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Bug 1807542 - allow rules exist which circumvent the deny_ptrace boolean
Summary: allow rules exist which circumvent the deny_ptrace boolean
Keywords:
Status: CLOSED WONTFIX
Alias: None
Product: Red Hat Enterprise Linux 9
Classification: Red Hat
Component: selinux-policy
Version: 9.0
Hardware: All
OS: Linux
medium
medium
Target Milestone: beta
: 9.0
Assignee: Zdenek Pytela
QA Contact: Milos Malik
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2020-02-26 15:18 UTC by Milos Malik
Modified: 2022-03-24 20:55 UTC (History)
4 users (show)

Fixed In Version:
Doc Type: No Doc Update
Doc Text:
Clone Of: 1421075
Environment:
Last Closed: 2021-10-20 07:27:06 UTC
Type: Bug
Target Upstream Version:
Embargoed:
pm-rhel: mirror+


Attachments (Terms of Use)

Description Milos Malik 2020-02-26 15:18:12 UTC
+++ This bug was initially created as a clone of Bug #1421075 +++

Description of problem:
All rules which allow the ptrace operation should be controlled via the deny_ptrace boolean.
* https://fedoraproject.org/wiki/Features/SELinuxDenyPtrace

Version-Release number of selected component (if applicable):
selinux-policy-3.14.3-39.el8.noarch
selinux-policy-targeted-3.14.3-39.el8.noarch
selinux-policy-mls-3.14.3-39.el8.noarch
selinux-policy-devel-3.14.3-39.el8.noarch

How reproducible:
* always

Steps to Reproduce:
# sesearch --allow -p ptrace | grep -v deny_ptrace | grep allow
allow staff_t wireshark_t:process { getattr ptrace sigchld sigkill signal signull sigstop transition };
allow svirt_t svirt_t:process { fork getcap getsched ptrace setrlimit setsched sigchld sigkill signal signull sigstop };
allow sysadm_t lockdev_t:process { getattr ptrace sigchld sigkill signal signull sigstop transition };
allow sysadm_t wireshark_t:process { getattr ptrace sigchld sigkill signal signull sigstop transition };
#

Actual results:
* the output of above-mentioned command contains 4 allow rules

Expected results:
* the output of above-mentioned command is empty

Comment 4 Zdenek Pytela 2021-08-11 16:25:47 UTC
The expectation that all ptrace permissions should be controlled by the deny_ptrace boolean is correct, changing the behaviour in the middle of RHEL 8 lifecycle though means a nonnegligible regression risk, especially for virt domains:

allow svirt_t svirt_t:process { fork getcap getsched ptrace setrlimit setsched sigchld sigkill signal signull sigstop };

hence retargetting to RHEL 9.

Comment 8 RHEL Program Management 2021-10-20 07:27:06 UTC
After evaluating this issue, there are no plans to address it further or fix it in an upcoming release.  Therefore, it is being closed.  If plans change such that this issue will be fixed in an upcoming release, then the bug can be reopened.


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