1683754 – bind cannot access /proc/sys/net/ipv4/ip_local_port_range

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Bug 1683754 - bind cannot access /proc/sys/net/ipv4/ip_local_port_range

Summary: bind cannot access /proc/sys/net/ipv4/ip_local_port_range

Keywords:
Status:	CLOSED ERRATA
Alias:	None
Product:	Red Hat Enterprise Linux 7
Classification:	Red Hat
Component:	selinux-policy
Sub Component:
Version:	7.7
Hardware:	All
OS:	Linux
Priority:	medium
Severity:	medium
Target Milestone:	rc
Target Release:	---
Assignee:	Lukas Vrabec
QA Contact:	Milos Malik
Docs Contact:
URL:
Whiteboard:
Duplicates (1):	1701969 (view as bug list)
Depends On:
Blocks:	bind911_rebase_el7 1701969
TreeView+	depends on / blocked

Reported:	2019-02-27 17:47 UTC by Petr Menšík
Modified:	2019-08-06 12:53 UTC (History)
CC List:	7 users (show)
Fixed In Version:
Doc Type:	If docs needed, set a value
Doc Text:
Clone Of:
Environment:
Last Closed:	2019-08-06 12:53:24 UTC
Target Upstream Version:
Embargoed:

Attachments	(Terms of Use)

Links
System	ID	Private	Priority	Status	Summary	Last Updated
Red Hat Product Errata	RHBA-2019:2127	0	None	None	None	2019-08-06 12:53:36 UTC

Description Petr Menšík 2019-02-27 17:47:35 UTC

Description of problem:
After a bind rebase to 9.11 version, AVC failures occur in tests. It seems new BIND tries to read current used port ranges from /proc/sys/net/ipv4/ip_local_port_range everytime.

Version-Release number of selected component (if applicable):
selinux-policy-3.13.1-229.el7_6.9.noarch
bind-9.11.4-1.P2.el7.x86_64

How reproducible:
always

Steps to Reproduce:
1. yum install bind
2. systemctl restart named
3.

Actual results:
type=PROCTITLE msg=audit(02/27/2019 11:18:00.906:150) : proctitle=/usr/sbin/named -u named -c /etc/named.conf 
type=SYSCALL msg=audit(02/27/2019 11:18:00.906:150) : arch=x86_64 syscall=open success=no exit=EACCES(Permission denied) a0=0x7f37a44b31c0 a1=O_RDONLY a2=0x1b6 a3=0x24 items=0 ppid=10603 pid=10605 auid=unset uid=named gid=named euid=named suid=named fsuid=named egid=named sgid=named fsgid=named tty=(none) ses=unset comm=isc-worker0000 exe=/usr/sbin/named subj=system_u:system_r:named_t:s0 key=(null) 
type=AVC msg=audit(02/27/2019 11:18:00.906:150) : avc:  denied  { search } for  pid=10605 comm=isc-worker0000 name=net dev="proc" ino=8221 scontext=system_u:system_r:named_t:s0 tcontext=system_u:object_r:sysctl_net_t:s0 tclass=dir permissive=0 


Expected results:
no AVC failures

Additional info:

Reading values can be supressed by use-v6-udp-ports and use-v6-udp-ports options. It would be great if those could be read from system, without manual configuration.

It seems to me it requires kernel_read_net_sysctls(named_t)

Comment 3 Milos Malik 2019-03-04 13:20:34 UTC

# rpm -qa bind\* selinux\* | sort
bind-9.11.4-2.P2.el7.x86_64
bind-libs-9.11.4-2.P2.el7.x86_64
bind-libs-lite-9.11.4-2.P2.el7.x86_64
bind-license-9.11.4-2.P2.el7.noarch
selinux-policy-3.13.1-236.el7.noarch
selinux-policy-targeted-3.13.1-236.el7.noarch
#

Appeared in enforcing mode:
----
type=PROCTITLE msg=audit(03/04/2019 08:17:37.492:378) : proctitle=/usr/sbin/named -u named -c /etc/named.conf 
type=SYSCALL msg=audit(03/04/2019 08:17:37.492:378) : arch=x86_64 syscall=open success=no exit=EACCES(Permission denied) a0=0x7f7bfa47c1c0 a1=O_RDONLY a2=0x1b6 a3=0x24 items=0 ppid=12634 pid=12636 auid=unset uid=named gid=named euid=named suid=named fsuid=named egid=named sgid=named fsgid=named tty=(none) ses=unset comm=isc-worker0000 exe=/usr/sbin/named subj=system_u:system_r:named_t:s0 key=(null) 
type=AVC msg=audit(03/04/2019 08:17:37.492:378) : avc:  denied  { search } for  pid=12636 comm=isc-worker0000 name=net dev="proc" ino=7441 scontext=system_u:system_r:named_t:s0 tcontext=system_u:object_r:sysctl_net_t:s0 tclass=dir permissive=0 
----

Appeared in permissive mode:
----
type=PROCTITLE msg=audit(03/04/2019 08:18:19.003:387) : proctitle=/usr/sbin/named -u named -c /etc/named.conf 
type=SYSCALL msg=audit(03/04/2019 08:18:19.003:387) : arch=x86_64 syscall=open success=yes exit=11 a0=0x7f392329b1c0 a1=O_RDONLY a2=0x1b6 a3=0x24 items=0 ppid=12700 pid=12702 auid=unset uid=named gid=named euid=named suid=named fsuid=named egid=named sgid=named fsgid=named tty=(none) ses=unset comm=isc-worker0000 exe=/usr/sbin/named subj=system_u:system_r:named_t:s0 key=(null) 
type=AVC msg=audit(03/04/2019 08:18:19.003:387) : avc:  denied  { open } for  pid=12702 comm=isc-worker0000 path=/proc/sys/net/ipv4/ip_local_port_range dev="proc" ino=37652 scontext=system_u:system_r:named_t:s0 tcontext=system_u:object_r:sysctl_net_t:s0 tclass=file permissive=1 
type=AVC msg=audit(03/04/2019 08:18:19.003:387) : avc:  denied  { read } for  pid=12702 comm=isc-worker0000 name=ip_local_port_range dev="proc" ino=37652 scontext=system_u:system_r:named_t:s0 tcontext=system_u:object_r:sysctl_net_t:s0 tclass=file permissive=1 
type=AVC msg=audit(03/04/2019 08:18:19.003:387) : avc:  denied  { search } for  pid=12702 comm=isc-worker0000 name=net dev="proc" ino=7441 scontext=system_u:system_r:named_t:s0 tcontext=system_u:object_r:sysctl_net_t:s0 tclass=dir permissive=1 
----
type=PROCTITLE msg=audit(03/04/2019 08:18:19.003:388) : proctitle=/usr/sbin/named -u named -c /etc/named.conf 
type=SYSCALL msg=audit(03/04/2019 08:18:19.003:388) : arch=x86_64 syscall=fstat success=yes exit=0 a0=0xb a1=0x7f3920838240 a2=0x7f3920838240 a3=0x7f39208381a0 items=0 ppid=12700 pid=12702 auid=unset uid=named gid=named euid=named suid=named fsuid=named egid=named sgid=named fsgid=named tty=(none) ses=unset comm=isc-worker0000 exe=/usr/sbin/named subj=system_u:system_r:named_t:s0 key=(null) 
type=AVC msg=audit(03/04/2019 08:18:19.003:388) : avc:  denied  { getattr } for  pid=12702 comm=isc-worker0000 path=/proc/sys/net/ipv4/ip_local_port_range dev="proc" ino=37652 scontext=system_u:system_r:named_t:s0 tcontext=system_u:object_r:sysctl_net_t:s0 tclass=file permissive=1 
----

Comment 10 Tomáš Hozza 2019-06-17 15:32:48 UTC

*** Bug 1701969 has been marked as a duplicate of this bug. ***

Comment 12 errata-xmlrpc 2019-08-06 12:53:24 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-2019:2127

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