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Bug 1451735 - rngd produces AVC denial about /sys/devices/virtual/misc/hw_random/rng_available
Summary: rngd produces AVC denial about /sys/devices/virtual/misc/hw_random/rng_available
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Red Hat Enterprise Linux 7
Classification: Red Hat
Component: selinux-policy
Version: 7.4
Hardware: All
OS: Linux
unspecified
unspecified
Target Milestone: rc
: ---
Assignee: Lukas Vrabec
QA Contact: Milos Malik
URL:
Whiteboard:
: 1452629 (view as bug list)
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2017-05-17 12:07 UTC by Jan Pazdziora
Modified: 2017-08-01 15:26 UTC (History)
8 users (show)

Fixed In Version: selinux-policy-3.13.1-151.el7
Doc Type: If docs needed, set a value
Doc Text:
Clone Of:
Environment:
Last Closed: 2017-08-01 15:26:23 UTC
Target Upstream Version:
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHBA-2017:1861 0 normal SHIPPED_LIVE selinux-policy bug fix update 2017-08-01 17:50:24 UTC

Description Jan Pazdziora 2017-05-17 12:07:11 UTC 
Description of problem:

New rng-tools causes AVC denial to be logged when rngd -f is run.

Version-Release number of selected component (if applicable):

rng-tools-5-10.el7

How reproducible:

Deterministic.

Steps to Reproduce:
1. yum install -y rng-tools
2. systemctl start rngd
2. Check audit.log.

Actual results:

type=SYSCALL msg=audit(1495020115.415:57): arch=c000003e syscall=4 success=no exit=-13 a0=1b53050 a1=7ffd9ee435c0 a2=7ffd9ee435c0 a3=7ffd9ee432d0 items=0 ppid=1 pid=12726 auid=4294967295 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0 tty=(none) ses=4294967295 comm="rngd" exe="/usr/sbin/rngd" subj=system_u:system_r:rngd_t:s0 key=(null)
type=AVC msg=audit(1495020115.415:57): avc:  denied  { getattr } for  pid=12726 comm="rngd" path="/sys/devices/virtual/misc/hw_random/rng_available" dev="sysfs" ino=10220 scontext=system_u:system_r:rngd_t:s0 tcontext=system_u:object_r:sysfs_t:s0 tclass=file

Expected results:

No AVC denial.

Additional info:

This is a regression against rng-tools-5-9.el7.
Comment 5 Neil Horman 2017-05-17 13:49:11 UTC 
This needs to be addressed in the selinux policy component, as it needs rngd read access to the rng_available sysfs attribute
Comment 6 Milos Malik 2017-05-18 08:03:11 UTC 
Following SELinux denials appear in permissive mode:
----
type=PROCTITLE msg=audit(05/18/2017 10:02:08.184:287) : proctitle=/sbin/rngd -f 
type=PATH msg=audit(05/18/2017 10:02:08.184:287) : item=0 name=/sys/devices/virtual/misc/hw_random/rng_available inode=7213 dev=00:12 mode=file,444 ouid=root ogid=root rdev=00:00 obj=system_u:object_r:sysfs_t:s0 nametype=NORMAL 
type=CWD msg=audit(05/18/2017 10:02:08.184:287) : cwd=/ 
type=SYSCALL msg=audit(05/18/2017 10:02:08.184:287) : arch=x86_64 syscall=stat success=yes exit=0 a0=0xa900e0 a1=0x7ffc739170b0 a2=0x7ffc739170b0 a3=0x7ffc73916dc0 items=1 ppid=1 pid=23401 auid=unset uid=root gid=root euid=root suid=root fsuid=root egid=root sgid=root fsgid=root tty=(none) ses=unset comm=rngd exe=/usr/sbin/rngd subj=system_u:system_r:rngd_t:s0 key=(null) 
type=AVC msg=audit(05/18/2017 10:02:08.184:287) : avc:  denied  { getattr } for  pid=23401 comm=rngd path=/sys/devices/virtual/misc/hw_random/rng_available dev="sysfs" ino=7213 scontext=system_u:system_r:rngd_t:s0 tcontext=system_u:object_r:sysfs_t:s0 tclass=file permissive=1 
----
type=PROCTITLE msg=audit(05/18/2017 10:02:08.184:288) : proctitle=/sbin/rngd -f 
type=PATH msg=audit(05/18/2017 10:02:08.184:288) : item=0 name=/sys/devices/virtual/misc/hw_random/rng_available inode=7213 dev=00:12 mode=file,444 ouid=root ogid=root rdev=00:00 obj=system_u:object_r:sysfs_t:s0 nametype=NORMAL 
type=CWD msg=audit(05/18/2017 10:02:08.184:288) : cwd=/ 
type=SYSCALL msg=audit(05/18/2017 10:02:08.184:288) : arch=x86_64 syscall=open success=yes exit=4 a0=0xa900e0 a1=O_RDONLY a2=0xa91200 a3=0x7ffc73916e40 items=1 ppid=1 pid=23401 auid=unset uid=root gid=root euid=root suid=root fsuid=root egid=root sgid=root fsgid=root tty=(none) ses=unset comm=rngd exe=/usr/sbin/rngd subj=system_u:system_r:rngd_t:s0 key=(null) 
type=AVC msg=audit(05/18/2017 10:02:08.184:288) : avc:  denied  { open } for  pid=23401 comm=rngd path=/sys/devices/virtual/misc/hw_random/rng_available dev="sysfs" ino=7213 scontext=system_u:system_r:rngd_t:s0 tcontext=system_u:object_r:sysfs_t:s0 tclass=file permissive=1 
type=AVC msg=audit(05/18/2017 10:02:08.184:288) : avc:  denied  { read } for  pid=23401 comm=rngd name=rng_available dev="sysfs" ino=7213 scontext=system_u:system_r:rngd_t:s0 tcontext=system_u:object_r:sysfs_t:s0 tclass=file permissive=1 
----
Comment 10 Lukas Vrabec 2017-05-23 08:39:25 UTC 
*** Bug 1452629 has been marked as a duplicate of this bug. ***
Comment 11 errata-xmlrpc 2017-08-01 15:26:23 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://access.redhat.com/errata/RHBA-2017:1861
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