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Description of problem: # sealert -l 9860e8d4-c074-40d4-82a7-0c0ee560e88d SELinux is preventing /usr/sbin/snapperd from using the dac_override capability. ***** Plugin dac_override (91.4 confidence) suggests ********************** If you want to help identify if domain needs this access or you have a file with the wrong permissions on your system Then turn on full auditing to get path information about the offending file and generate the error again. Do Turn on full auditing # auditctl -w /etc/shadow -p w Try to recreate AVC. Then execute # ausearch -m avc -ts recent If you see PATH record check ownership/permissions on file, and fix it, otherwise report as a bugzilla. ***** Plugin catchall (9.59 confidence) suggests ************************** If you believe that snapperd should have the dac_override capability by default. Then you should report this as a bug. You can generate a local policy module to allow this access. Do allow this access for now by executing: # ausearch -c 'snapperd' --raw | audit2allow -M my-snapperd # semodule -i my-snapperd.pp Additional Information: Source Context system_u:system_r:snapperd_t:s0-s0:c0.c1023 Target Context system_u:system_r:snapperd_t:s0-s0:c0.c1023 Target Objects Unknown [ capability ] Source snapperd Source Path /usr/sbin/snapperd Port <Unknown> Host ***** Source RPM Packages Target RPM Packages Policy RPM selinux-policy-3.13.1-210.el7.noarch Selinux Enabled True Policy Type targeted Enforcing Mode Enforcing Host Name ***** Platform ***** 3.10.0-933.el7.x86_64 #1 SMP Sat Aug 11 11:32:57 EDT 2018 x86_64 x86_64 Alert Count 4 First Seen 2018-08-20 16:55:30 CEST Last Seen 2018-08-20 17:04:54 CEST Local ID 9860e8d4-c074-40d4-82a7-0c0ee560e88d Raw Audit Messages type=AVC msg=audit(1534777494.314:3557): avc: denied { dac_override } for pid=71155 comm="snapperd" capability=1 scontext=system_u:system_r:snapperd_t:s0-s0:c0.c1023 tcontext=system_u:system_r:snapperd_t:s0-s0:c0.c1023 tclass=capability permissive=0 Hash: snapperd,snapperd_t,snapperd_t,capability,dac_override # ausearch -m AVC --start recent ---- time->Mon Aug 20 17:04:54 2018 type=PROCTITLE msg=audit(1534777494.314:3557): proctitle=2F7573722F7362696E2F736E617070657264002D64 type=SYSCALL msg=audit(1534777494.314:3557): arch=c000003e syscall=258 success=no exit=-13 a0=6 a1=7f1de0002f28 a2=1e8 a3=5f7463656a626f3a items=0 ppid=1 pid=71155 auid=4294967295 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0 tty=(none) ses=4294967295 comm="snapperd" exe="/usr/sbin/snapperd" subj=system_u:system_r:snapperd_t:s0-s0:c0.c1023 key=(null) type=AVC msg=audit(1534777494.314:3557): avc: denied { dac_override } for pid=71155 comm="snapperd" capability=1 scontext=system_u:system_r:snapperd_t:s0-s0:c0.c1023 tcontext=system_u:system_r:snapperd_t:s0-s0:c0.c1023 tclass=capability permissive=0 Version-Release number of selected component (if applicable): selinux-policy-3.13.1-210.el7.noarch snapper-0.2.8-4.el7.x86_64 3.10.0-933.el7.x86_64 How reproducible: 100% Steps to Reproduce: 1.snapper -c bugtest create-config -f "lvm(xfs)" /mnt/test Actual results: 'Creating config failed (mkdir failed).' and AVC denial Expected results: config is created Additional info:
I can also produce/re-produce this on Fedora 29. ``` [root@localhost ~]# dnf install -y snapper python3-dnf-plugins-extras-snapper ... [root@localhost ~]# rpm -q snapper snapper-0.5.6-1.fc29.x86_64 [root@localhost ~]# snapper --config=root create-config / Creating config failed (creating btrfs subvolume .snapshots failed). [root@localhost ~]# ausearch -m avc ---- time->Sun Jan 6 16:51:07 2019 type=AVC msg=audit(1546793467.367:234): avc: denied { dac_override } for pid=24405 comm="snapperd" capability=1 scontext=system_u:system_r:snapperd_t:s0-s0:c0.c1023 tcontext=system_u:system_r:snapperd_t:s0-s0:c0.c1023 tclass=capability permissive=0 ```
upstream PR: https://github.com/fedora-selinux/selinux-policy-contrib/pull/80
PR merged. commit 5b407ea09c2d05b013ea38919ff6676f69c02bca (HEAD -> rawhide, origin/rawhide, origin/HEAD) Author: Dusty Mabe <dusty@dustymabe.com> Date: Sun Jan 6 12:07:14 2019 -0500 Add dac_override capability for snapperd_t domain BZ(1619356) Thanks.
This issue was not selected to be included in Red Hat Enterprise Linux 7.7 because it is seen either as low or moderate impact to a small number of use-cases. The next release will be in Maintenance Support 1 Phase, which means that qualified Critical and Important Security errata advisories (RHSAs) and Urgent Priority Bug Fix errata advisories (RHBAs) may be released as they become available. We will now close this issue, but if you believe that it qualifies for the Maintenance Support 1 Phase, please re-open; otherwise, we recommend moving the request to Red Hat Enterprise Linux 8 if applicable.