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Bug 2070983

Summary: SELinux is preventing perf from using the 'bpf' capability
Product: Red Hat Enterprise Linux 8 Reporter: Zdenek Pytela <zpytela>
Component: selinux-policyAssignee: Zdenek Pytela <zpytela>
Status: CLOSED NOTABUG QA Contact: Milos Malik <mmalik>
Severity: medium Docs Contact:
Priority: medium    
Version: 8.6CC: lvrabec, mmalik, nknazeko, qe-baseos-security, ssekidde
Target Milestone: rcKeywords: Triaged
Target Release: 8.7Flags: pm-rhel: mirror+
Hardware: All   
OS: Linux   
Whiteboard:
Fixed In Version: Doc Type: No Doc Update
Doc Text:
Story Points: ---
Clone Of: 2070982 Environment:
Last Closed: 2022-04-27 07:49:13 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: 2070982    
Bug Blocks:    

Description Zdenek Pytela 2022-04-01 13:56:13 UTC
+++ This bug was initially created as a clone of Bug #2070982 +++

Description of problem:
SELinux is preventing perf from using the 'bpf' capability

Version-Release number of selected component (if applicable):
selinux-policy-3.14.3-95.el8.noarch

How reproducible:
always in the /CoreOS/selinux-policy/Regression/perf_event-and-related test

Steps to Reproduce:

Actual results:
AVC denial is audited:
----
type=PROCTITLE msg=audit(04/01/2022 05:07:54.437:7828) : proctitle=perf record -o /dev/null echo test 
type=SYSCALL msg=audit(04/01/2022 05:07:54.437:7828) : arch=x86_64 syscall=bpf success=yes exit=0 a0=BPF_PROG_GET_NEXT_ID a1=0x7ffcf24e4f80 a2=0x80 a3=0x0 items=0 ppid=377113 pid=377114 auid=root uid=root gid=root euid=root suid=root fsuid=root egid=root sgid=root fsgid=root tty=pts2 ses=136 comm=perf exe=/usr/bin/perf subj=sysadm_u:sysadm_r:sysadm_t:s0-s0:c0.c1023 key=(null) 
type=AVC msg=audit(04/01/2022 05:07:54.437:7828) : avc:  denied  { bpf } for  pid=377114 comm=perf capability=bpf  scontext=sysadm_u:sysadm_r:sysadm_t:s0-s0:c0.c1023 tcontext=sysadm_u:sysadm_r:sysadm_t:s0-s0:c0.c1023 tclass=capability2 permissive=0 
----

Expected results:
no denial

Additional info:

Comment 1 Zdenek Pytela 2022-04-01 13:58:27 UTC
Commit to backport:
commit 0fa3cc8988c28c5da8b6844cdac0d052ec48dc3b
Author: Zdenek Pytela <zpytela>
Date:   Wed Jan 12 17:39:33 2022 +0100

    Allow administrative users the bpf capability

Comment 5 Zdenek Pytela 2022-04-25 11:59:53 UTC
The commit needs to be reverted, the bpf class is not in RHEL 8. The sys_admin capability is used instead and the permission is allowed.

rhel8# sesearch -A -s sysadm_t -t sysadm_t -c capability
...
allow sysadm_t sysadm_t:capability { audit_control audit_write chown dac_override dac_read_search fowner fsetid ipc_lock ipc_owner kill lease linux_immutable mknod net_admin net_bind_service net_broadcast net_raw setfcap setgid setpcap setuid sys_admin sys_boot sys_chroot sys_nice sys_pacct sys_ptrace sys_rawio sys_resource sys_time sys_tty_config };
...