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Bug 1179841 - sulogin denied reading urandom in rescue mode
Summary: sulogin denied reading urandom in rescue mode
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Red Hat Enterprise Linux 7
Classification: Red Hat
Component: selinux-policy
Version: 7.1
Hardware: All
OS: Linux
unspecified
unspecified
Target Milestone: rc
: ---
Assignee: Miroslav Grepl
QA Contact: Milos Malik
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2015-01-07 16:18 UTC by Karel Volný
Modified: 2015-03-05 10:48 UTC (History)
7 users (show)

Fixed In Version: selinux-policy-3.13.1-15.el7
Doc Type: Bug Fix
Doc Text:
Clone Of:
Environment:
Last Closed: 2015-03-05 10:48:11 UTC
Target Upstream Version:
Embargoed:


Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHBA-2015:0458 0 normal SHIPPED_LIVE selinux-policy bug fix and enhancement update 2015-03-05 15:17:00 UTC

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


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