Description of problem:
The Clam Antivirus daemon, clamd, can use the fanotify(7) interface to allow malware scans to be triggered dynamically, as files are accessed. clamd provides a configuration option, OnAccessExcludeUID, to exempt certain users from on-access antivirus scanning. To implement this, clamd looks at the pid field of the fanotify_event_metadata structure, and calls stat() on /proc/PID. If the stat() call succeeds, clamd then checks whether the stat.uid_t value matches any uid that clamd was told to exclude from on-access scanning. If clamd finds a match, it takes no further action; if it doesn't find a match, it performs a scan of the file that was accessed. At the moment, the SELinux targeted policy prevents clamd from calling stat() on arbitrary pids in /proc:

[pid  1234] stat("/proc/5678", 0x7f81768785a0) = -1 EACCES (Permission denied)

A new boolean which would allow system administrators to grant the getattr permission on domains is requested to accomplish the feature.


Version-Release number of selected component (if applicable):
selinux-policy-3.13.1-166.el7_4.7

How reproducible:
always

Steps to Reproduce:
1. install clamav-server
2. turn OnAccessExcludeUID on

Actual results:
Permission denied when accessing directories in /proc

Expected results:
No permission denied

Additional info:
The selinux policy currently contains a dontaudit rule:
   dontaudit antivirus_domain domain : dir { ioctl read getattr lock search open } ;