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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 } ;
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.
For information on the advisory, and where to find the updated
files, follow the link below.
If the solution does not work for you, open a new bug report.
https://access.redhat.com/errata/RHBA-2018:3111
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 } ;