Bug 732057
| Summary: | SELinux is preventing /usr/lib/cups/backend/usb from 'ioctl' accesses on the chr_file /dev/usb/lp0. | ||
|---|---|---|---|
| Product: | [Fedora] Fedora | Reporter: | Till Maas <opensource> |
| Component: | selinux-policy | Assignee: | Miroslav Grepl <mgrepl> |
| Status: | CLOSED CURRENTRELEASE | QA Contact: | Fedora Extras Quality Assurance <extras-qa> |
| Severity: | medium | Docs Contact: | |
| Priority: | medium | ||
| Version: | 15 | CC: | dominick.grift, dwalsh, mgrepl, opensource |
| Target Milestone: | --- | ||
| Target Release: | --- | ||
| Hardware: | x86_64 | ||
| OS: | Linux | ||
| Whiteboard: | setroubleshoot_trace_hash:5b5b0595276465af571cccc5622a058797b6e4698fd7c38c806c71a032c4efc8 | ||
| Fixed In Version: | Doc Type: | Bug Fix | |
| Doc Text: | Story Points: | --- | |
| Clone Of: | Environment: | ||
| Last Closed: | 2011-10-07 15:00:51 UTC | Type: | --- |
| Regression: | --- | Mount Type: | --- |
| Documentation: | --- | CRM: | |
| Verified Versions: | Category: | --- | |
| oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | |
| Cloudforms Team: | --- | Target Upstream Version: | |
| Embargoed: | |||
"/dev/usb/lp0" is mislabeled. What does ls -lZ /dev/usb/lp0 show? $ ls -lZ /dev/usb/lp0 crw-rw----. root lp system_u:object_r:printer_device_t:s0 /dev/usb/lp0 Looks like a race condition between the creation and udev fixing the label. (In reply to comment #3) > Looks like a race condition between the creation and udev fixing the label. If I plug the USB cable in, the label is indeed different for a short amount of time: $ ls -lZ /dev/usb/lp0 crw-------. root root system_u:object_r:device_t:s0 /dev/usb/lp0 $ ls -lZ /dev/usb/lp0 crw-rw----. root lp system_u:object_r:printer_device_t:s0 /dev/usb/lp Luckily this race condition should be fixed in F16 Miroslav we can probably add a dontaudit for now. |
SELinux is preventing /usr/lib/cups/backend/usb from 'ioctl' accesses on the chr_file /dev/usb/lp0. ***** Plugin restorecon (90.5 confidence) suggests ************************* If you want to fix the label. /dev/usb/lp0 default label should be printer_device_t. Then you can run restorecon. Do # /sbin/restorecon -v /dev/usb/lp0 ***** Plugin device (9.50 confidence) suggests ***************************** If you want to allow usb to have ioctl access on the lp0 chr_file Then you need to change the label on /dev/usb/lp0 to a type of a similar device. Do # semanage fcontext -a -t SIMILAR_TYPE '/dev/usb/lp0' # restorecon -v '/dev/usb/lp0' ***** Plugin catchall (1.40 confidence) suggests *************************** If you believe that usb should be allowed ioctl access on the lp0 chr_file 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: # grep usb /var/log/audit/audit.log | audit2allow -M mypol # semodule -i mypol.pp Additional Information: Source Context system_u:system_r:cupsd_t:s0-s0:c0.c1023 Target Context system_u:object_r:device_t:s0 Target Objects /dev/usb/lp0 [ chr_file ] Source usb Source Path /usr/lib/cups/backend/usb Port <Unbekannt> Host (removed) Source RPM Packages cups-1.4.8-1.fc15 Target RPM Packages Policy RPM selinux-policy-3.9.16-35.fc15 Selinux Enabled True Policy Type targeted Enforcing Mode Permissive Host Name (removed) Platform Linux (removed) 2.6.40-4.fc15.x86_64 #1 SMP Fri Jul 29 18:46:53 UTC 2011 x86_64 x86_64 Alert Count 1 First Seen Fr 12 Aug 2011 18:52:00 CEST Last Seen Fr 12 Aug 2011 18:52:00 CEST Local ID 7c818c31-b82c-43b2-92af-16d81d81195b Raw Audit Messages type=AVC msg=audit(1313167920.824:2217): avc: denied { ioctl } for pid=851 comm="usb" path="/dev/usb/lp0" dev=devtmpfs ino=578769 scontext=system_u:system_r:cupsd_t:s0-s0:c0.c1023 tcontext=system_u:object_r:device_t:s0 tclass=chr_file type=SYSCALL msg=audit(1313167920.824:2217): arch=x86_64 syscall=ioctl success=yes exit=0 a0=5 a1=84005001 a2=7fffd4514700 a3=7fffd45142d0 items=0 ppid=3085 pid=851 auid=4294967295 uid=4 gid=7 euid=4 suid=4 fsuid=4 egid=7 sgid=7 fsgid=7 tty=(none) ses=4294967295 comm=usb exe=/usr/lib/cups/backend/usb subj=system_u:system_r:cupsd_t:s0-s0:c0.c1023 key=(null) Hash: usb,cupsd_t,device_t,chr_file,ioctl audit2allow #============= cupsd_t ============== allow cupsd_t device_t:chr_file ioctl; audit2allow -R #============= cupsd_t ============== allow cupsd_t device_t:chr_file ioctl;