Bug 1179841

Summary:	sulogin denied reading urandom in rescue mode
Product:	Red Hat Enterprise Linux 7	Reporter:	Karel Volný <kvolny>
Component:	selinux-policy	Assignee:	Miroslav Grepl <mgrepl>
Status:	CLOSED ERRATA	QA Contact:	Milos Malik <mmalik>
Severity:	unspecified	Docs Contact:
Priority:	unspecified
Version:	7.1	CC:	lmiksik, lvrabec, mgrepl, mmalik, plautrba, pvrabec, ssekidde
Target Milestone:	rc
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	selinux-policy-3.13.1-15.el7	Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2015-03-05 10:48:11 UTC	Type:	Bug
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description Karel Volný 2015-01-07 16:18:06 UTC

Description of problem:
While testing bug 1029385, I've hit AVC - sulogin is denied reading urandom in rescue mode.

Version-Release number of selected component (if applicable):
selinux-policy-3.13.1-14.el7

How reproducible:
always

Steps to Reproduce:
1. boot into rescue mode (I've removed 'rhgb' and 'quiet' and added 'single' to the kernel commandline in grub)
2. enter the admin password

Actual results:
see attachment 977431 [details]

Expected results:
(no such denial)

Additional info:

Comment 2 Milos Malik 2015-01-08 09:49:15 UTC

Here is the relevant output of dmesg:

[    9.661970] type=1400 audit(1420710275.711:4): avc:  denied  { read } for  pid=412 comm="sulogin" name="urandom" dev="devtmpfs" ino=4553 scontext=system_u:system_r:sulogin_t:s0-s0:c0.c1023 tcontext=system_u:object_r:urandom_device_t:s0 tclass=chr_file

Comment 3 Milos Malik 2015-01-08 10:07:56 UTC

Here is the relevant output of dmesg in permissive mode:
[   10.177459] type=1400 audit(1420711601.220:3): avc:  denied  { read } for  pid=415 comm="sulogin" name="urandom" dev="devtmpfs" ino=4553 scontext=system_u:system_r:sulogin_t:s0-s0:c0.c1023 tcontext=system_u:object_r:urandom_device_t:s0 tclass=chr_file
[   10.177806] type=1400 audit(1420711601.220:4): avc:  denied  { open } for  pid=415 comm="sulogin" path="/dev/urandom" dev="devtmpfs" ino=4553 scontext=system_u:system_r:sulogin_t:s0-s0:c0.c1023 tcontext=system_u:object_r:urandom_device_t:s0 tclass=chr_file

Comment 4 Miroslav Grepl 2015-01-09 13:09:54 UTC

commit b4fa7bc0fa18ac2db8e4c846c7e14d7c1a89970d
Author: Miroslav Grepl <mgrepl>
Date:   Fri Jan 9 14:03:04 2015 +0100

    Allow sulogin to read /dev/urandom and /dev/random.

Comment 9 errata-xmlrpc 2015-03-05 10:48:11 UTC

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://rhn.redhat.com/errata/RHBA-2015-0458.html