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Bug 230628 - SELinux rejects ub
SELinux rejects ub
Product: Fedora
Classification: Fedora
Component: selinux-policy (Show other bugs)
x86_64 Linux
medium Severity medium
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Assigned To: Daniel Walsh
Ben Levenson
Depends On: 230322
  Show dependency treegraph
Reported: 2007-03-01 16:21 EST by Pete Zaitcev
Modified: 2007-11-30 17:11 EST (History)
3 users (show)

See Also:
Fixed In Version: Current
Doc Type: Bug Fix
Doc Text:
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Clone Of:
Last Closed: 2007-08-22 10:12:15 EDT
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Regression: ---
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Verified Versions:
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oVirt Team: ---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: ---

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Description Pete Zaitcev 2007-03-01 16:21:31 EST
Hi, Dan:

Fedora has a capability to switch between ub and sd in runtime,
so please consider if a workaround for this would be feasible.
Since sd is the primary driver and ub is a workaround, this is a low
priority, but would be very nice to have.

-- Pete

+++ This bug was initially created as a clone of Bug #230322 +++

Version-Release number of selected component (if applicable):
2.6.19-1.2911.fc6 #1 SMP

-- Additional comment from zaitcev@redhat.com on 2007-02-28 13:00 EST --

BTW, what does happen if you boot with libusual.bias="ub" in grub.conf?

-- Additional comment from jonathan.underwood@gmail.com on 2007-03-01 06:07 EST --
Hi Pete, thanks for your response. Adding libusual.bias="ub" fixes the problem,
once I had disabled SElinux.  I'm not sure that the problem is specific to the
usb-storeage layer though, as I am also seeing soft lockups when vmware tries to
create its virtual ethernet interfaces.  These also disappear with

[Just to put your mind at rest though - the problem originally reported in this
bug is present with an untainted kernel (i.e. without the vmware module loaded).]

As an aside, if there are any plans to enable libusual.bias="ub" out of the box,
then I guess the SElinux issue will need fixing up. The SElinux messages
displayed are:
 audit(1172746861.823:7): avc:  denied  { read } for  pid=5340
comm="hald-probe-volu" name="uba1" dev=tmpfs ino=20335
scontext=system_u:system_r:hald_t:s0 tcontext=system_u:object_r:device_t:s0
audit(1172746861.824:8): avc:  denied  { ioctl } for  pid=5340
comm="hald-probe-volu" name="uba1" dev=tmpfs ino=20335
scontext=system_u:system_r:hald_t:s0 tcontext=system_u:object_r:device_t:s0
SELinux: initialized (dev uba1, type vfat), uses genfs_contexts
audit(1172746862.109:9): avc:  denied  { getattr } for  pid=4470 comm="hald"
name="uba1" dev=tmpfs ino=20335 scontext=system_u:system_r:hald_t:s0
tcontext=system_u:object_r:device_t:s0 tclass=blk_file

-- Additional comment from zaitcev@redhat.com on 2007-03-01 16:15 EST --
Thanks for the testing, Jonathan. I'll clone this bug for Dan Walsh regarding
the SElinux issue.
Comment 1 Daniel Walsh 2007-03-01 16:27:04 EST
The problem here is the devices are labeled incorrectly.  They are labeled 
as device_t.  uba1 should probably be labeled usb_device_t?
Comment 2 Daniel Walsh 2007-03-01 16:33:17 EST
If you execute this command does everything work?

semanage fcontext -a -t removable_device_t -f '-b' '/dev/ub[a-z][0-9]+'

you might have to run

restorecon -v /dev/ub*

Current policy only matches
Comment 3 Pete Zaitcev 2007-03-01 16:45:01 EST
Adding Jon to cc:, to try the test (see comment #2).
Comment 4 Jonathan Underwood 2007-03-02 06:53:31 EST
I tried re-enabling SElinux and running those two commands, but it didn't work,
I still see this in dmesg:

audit(1172836335.532:20): avc:  denied  { read } for  pid=16589
comm="hald-probe-volu" name="uba1" dev=tmpfs ino=834181
scontext=system_u:system_r:hald_t:s0 tcontext=system_u:object_r:device_t:s0

and the drive isn't mounted.
Comment 5 Daniel Walsh 2007-03-02 10:04:59 EST
I believe you need to reboot or restart udev. since udev is not rereading the
file_context file.
Comment 6 Jonathan Underwood 2007-03-02 10:24:22 EST
Thanks Daniel - I rebooted having run those two commands. On reboot I added
libusual.bias="ub" to the kernel options line, and sure enough plugging in a usb
key causes it to be mounted and the contents displayed, with no SElinux
grumbling at all.
Comment 7 Daniel Walsh 2007-03-02 12:03:18 EST
Fixed in selinux-policy-2.4.6-42
Comment 8 Daniel Walsh 2007-08-22 10:12:15 EDT
Fixed in current release

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