Bug 184536 - setenforce 0 causes system hang
Summary: setenforce 0 causes system hang
Keywords:
Status: CLOSED CURRENTRELEASE
Alias: None
Product: Fedora
Classification: Fedora
Component: xen
Version: 5
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: James Morris
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks: 185595
TreeView+ depends on / blocked
 
Reported: 2006-03-09 18:25 UTC by Brian Brock
Modified: 2007-11-30 22:11 UTC (History)
4 users (show)

Fixed In Version: 2.6.16-2080_FC5xen0
Doc Type: Bug Fix
Doc Text:
Clone Of:
Environment:
Last Closed: 2006-04-24 15:24:26 UTC
Type: ---
Embargoed:


Attachments (Terms of Use)

Description Brian Brock 2006-03-09 18:25:48 UTC
running `setenforce 0` causes a system to hang

kernel-xen0-2.6.15-1.2032_FC5
audit-libs-python-1.1.5-1
audit-libs-1.1.5-1
selinux-policy-2.2.23-11
selinux-policy-targeted-2.2.23-11
libselinux-1.29.7-1.2
libselinux-python-1.29.7-1.2

boot kernel-xen0-2.6.15-1.2032_FC5 system with no selinux options specified.
run `getenforce`
run `setenforce 0`

# getenforce
Enforcing
# setenforce 0
audit(timestamp): avc: granted { granted } for pid=2398 comm="setenforce"
scontext=root:system_r:undefined_t:s0-s0:c0.255
tcontext=system_u:object_r:security_t:s0 tclass=security
<system is now hardlocked>

fully reproducible

Expected results:
no hard locking executing admin commands

Comment 1 Jeremy Katz 2006-03-09 18:27:31 UTC
Anything on serial console?

Comment 2 Brian Brock 2006-03-09 18:44:54 UTC
nothing output to serial console.

disable the xen serial console during boot stops it.  Here's my current
grub.conf boot stanzas:
title Fedora Core (2.6.15-1.2032_FC5xen0) noserial
        root (hd0,0)
        kernel /xen.gz-2.6.15-1.2032_FC5
        module /vmlinuz-2.6.15-1.2032_FC5xen0 ro root=LABEL=/1
        module /initrd-2.6.15-1.2032_FC5xen0.img
title Fedora Core (2.6.15-1.2032_FC5xen0)
        root (hd0,0)
        kernel /xen.gz-2.6.15-1.2032_FC5 com1=115200,8n1
        module /vmlinuz-2.6.15-1.2032_FC5xen0 ro root=LABEL=/1 console=ttyS0
console=tty0
        module /initrd-2.6.15-1.2032_FC5xen0.img

The first reliably works.  The second reliably hangs, but generates serial
output (including the (XEN) section) until just befere the hang.

Comment 3 Brian Brock 2006-03-09 18:54:42 UTC
hang does not occur if 'sync_console' is appended to the kernel line in grub.conf

Comment 5 James Morris 2006-03-22 21:50:00 UTC
Do you know if you had auditd running?

Comment 6 James Morris 2006-03-22 22:27:39 UTC
I've not been able to reproduce this with FC5.

Let me know if you still see it.

Comment 7 Brian Brock 2006-04-24 15:24:26 UTC
Haven't reproduced this with FC-5 GA or with current rawhide.


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