Bug 1498809

Summary: Squid fails to start: denied map on /dev/shm/squid-cf__metadata.shm
Product: [Fedora] Fedora Reporter: Matthew Booth <mbooth>
Component: selinux-policy-targetedAssignee: Lukas Vrabec <lvrabec>
Status: CLOSED ERRATA QA Contact: Ben Levenson <benl>
Severity: high Docs Contact:
Priority: unspecified    
Version: 27CC: dwalsh, richip
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Last Closed: 2017-11-28 23:55:00 UTC Type: Bug
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Description Matthew Booth 2017-10-05 10:07:07 UTC
Description of problem:
Squid fails to start. Service status shows:

Oct 05 10:43:42 workstation.marston squid[9300]: Ipc::Mem::Segment::attach failed to mmap(/squid-cf__metadata.shm): (13) Permission denied

audit.log contains:

type=AVC msg=audit(1507196622.502:322): avc:  denied  { map } for  pid=9300 comm="squid" path="/dev/shm/squid-cf__metadata.shm" dev="tmpfs" ino=111601 scontext=system_u:system_r:squid_t:s0 tcontext=system_u:object_r:squid_tmpfs_t:s0 tclass=file permissive=0


Version-Release number of selected component (if applicable):
squid-4.0.21-1.fc27.x86_64
selinux-policy-targeted-3.13.1-283.4.fc27.noarch

How reproducible:
100% on my system, freshly upgraded to F27 from F26, where squid was working fine.


Steps to Reproduce:

squid.conf is almost stock. Only significant different is this stanza:

# Uncomment and adjust the following to add a disk cache directory.
#cache_dir ufs /var/spool/squid 100 16 256
cache_replacement_policy heap LFUDA
cache_dir aufs /var/spool/squid 16000 16 256 max-size=8589934592
maximum_object_size 8192 MB

Additional information:

The following policy, auto-generated by audit2allow, allows squid to start:

policy_module(squid-local, 1.0)

require {
	type squid_t;
	type squid_tmpfs_t;
	class file map;
}

#============= squid_t ==============
allow squid_t squid_tmpfs_t:file map;

Comment 1 Richi Plana 2017-11-15 17:50:25 UTC
Came to report the same bug and saw this. Unfortunately, something is preventing me from applying the WA:

[root@legacy ~]# semodule -i squid.pp
libsemanage.semanage_direct_install_info: Overriding squid module at lower priority 100 with module at priority 400.
Failed to resolve typeattributeset statement at /var/lib/selinux/targeted/tmp/modules/400/squid/cil:1
semodule:  Failed!

Comment 2 Fedora Update System 2017-11-22 08:56:47 UTC
selinux-policy-3.13.1-283.17.fc27 has been submitted as an update to Fedora 27. https://bodhi.fedoraproject.org/updates/FEDORA-2017-d05b1a2ab9

Comment 3 Fedora Update System 2017-11-22 21:42:09 UTC
selinux-policy-3.13.1-283.17.fc27 has been pushed to the Fedora 27 testing repository. If problems still persist, please make note of it in this bug report.
See https://fedoraproject.org/wiki/QA:Updates_Testing for
instructions on how to install test updates.
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2017-d05b1a2ab9

Comment 4 Fedora Update System 2017-11-28 23:55:00 UTC
selinux-policy-3.13.1-283.17.fc27 has been pushed to the Fedora 27 stable repository. If problems still persist, please make note of it in this bug report.