Bug 550474 - SELinux is preventing /usr/bin/nmap access to a leaked /dev/console file descriptor.
Summary: SELinux is preventing /usr/bin/nmap access to a leaked /dev/console file desc...
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Fedora
Classification: Fedora
Component: selinux-policy
Version: 12
Hardware: x86_64
OS: Linux
low
medium
Target Milestone: ---
Assignee: Daniel Walsh
QA Contact: Fedora Extras Quality Assurance
URL:
Whiteboard: setroubleshoot_trace_hash:cb0f55c804e...
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2009-12-25 12:47 UTC by John
Modified: 2010-01-08 20:11 UTC (History)
3 users (show)

Fixed In Version: 3.6.32-66.fc12
Clone Of:
Environment:
Last Closed: 2010-01-08 20:11:14 UTC
Type: ---
Embargoed:


Attachments (Terms of Use)

Description John 2009-12-25 12:47:57 UTC
Summary:

SELinux is preventing /usr/bin/nmap access to a leaked /dev/console file
descriptor.

Detailed Description:

[nmap has a permissive type (traceroute_t). This access was not denied.]

SELinux denied access requested by the nmap command. It looks like this is
either a leaked descriptor or nmap output was redirected to a file it is not
allowed to access. Leaks usually can be ignored since SELinux is just closing
the leak and reporting the error. The application does not use the descriptor,
so it will run properly. If this is a redirection, you will not get output in
the /dev/console. You should generate a bugzilla on selinux-policy, and it will
get routed to the appropriate package. You can safely ignore this avc.

Allowing Access:

You can generate a local policy module to allow this access - see FAQ
(http://fedora.redhat.com/docs/selinux-faq-fc5/#id2961385)

Additional Information:

Source Context                system_u:system_r:traceroute_t:s0
Target Context                system_u:object_r:console_device_t:s0
Target Objects                /dev/console [ chr_file ]
Source                        nmap
Source Path                   /usr/bin/nmap
Port                          <Unknown>
Host                          (removed)
Source RPM Packages           nmap-5.00-4.fc12
Target RPM Packages           
Policy RPM                    selinux-policy-3.6.32-59.fc12
Selinux Enabled               True
Policy Type                   targeted
Enforcing Mode                Enforcing
Plugin Name                   leaks
Host Name                     (removed)
Platform                      Linux (removed) 2.6.31.9-1.2.82.xendom0.fc12.x86_64
                              #1 SMP Wed Dec 23 21:24:07 UTC 2009 x86_64 x86_64
Alert Count                   8
First Seen                    Wed 23 Dec 2009 09:24:59 AM MSK
Last Seen                     Fri 25 Dec 2009 03:25:45 PM MSK
Local ID                      e1e2c86c-05db-4dfa-a8b5-289b05abe1f2
Line Numbers                  

Raw Audit Messages            

node=(removed) type=AVC msg=audit(1261743945.73:6): avc:  denied  { read } for  pid=1885 comm="nmap" path="/dev/console" dev=tmpfs ino=1024 scontext=system_u:system_r:traceroute_t:s0 tcontext=system_u:object_r:console_device_t:s0 tclass=chr_file

node=(removed) type=AVC msg=audit(1261743945.73:6): avc:  denied  { read } for  pid=1885 comm="nmap" path="/dev/console" dev=tmpfs ino=1024 scontext=system_u:system_r:traceroute_t:s0 tcontext=system_u:object_r:console_device_t:s0 tclass=chr_file

node=(removed) type=AVC msg=audit(1261743945.73:6): avc:  denied  { read } for  pid=1885 comm="nmap" path="/dev/console" dev=tmpfs ino=1024 scontext=system_u:system_r:traceroute_t:s0 tcontext=system_u:object_r:console_device_t:s0 tclass=chr_file

node=(removed) type=SYSCALL msg=audit(1261743945.73:6): arch=c000003e syscall=59 success=yes exit=0 a0=2826230 a1=28261e0 a2=2825420 a3=20 items=0 ppid=1437 pid=1885 auid=4294967295 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0 tty=(none) ses=4294967295 comm="nmap" exe="/usr/bin/nmap" subj=system_u:system_r:traceroute_t:s0 key=(null)



Hash String generated from  selinux-policy-3.6.32-59.fc12,leaks,nmap,traceroute_t,console_device_t,chr_file,read
audit2allow suggests:

#============= traceroute_t ==============
allow traceroute_t console_device_t:chr_file read;

Comment 1 Daniel Walsh 2009-12-30 01:02:36 UTC
You can add these rules for now using

# grep avc /var/log/audit/audit.log | audit2allow -M mypol
# semodule -i mypol.pp

Fixed in selinux-policy-3.6.32-65.fc12.noarch

Comment 2 Fedora Update System 2010-01-04 21:54:45 UTC
selinux-policy-3.6.32-66.fc12 has been submitted as an update for Fedora 12.
http://admin.fedoraproject.org/updates/selinux-policy-3.6.32-66.fc12

Comment 3 Fedora Update System 2010-01-05 22:50:49 UTC
selinux-policy-3.6.32-66.fc12 has been pushed to the Fedora 12 testing repository.  If problems still persist, please make note of it in this bug report.
 If you want to test the update, you can install it with 
 su -c 'yum --enablerepo=updates-testing update selinux-policy'.  You can provide feedback for this update here: http://admin.fedoraproject.org/updates/F12/FEDORA-2010-0184

Comment 4 Fedora Update System 2010-01-08 20:05:36 UTC
selinux-policy-3.6.32-66.fc12 has been pushed to the Fedora 12 stable repository.  If problems still persist, please make note of it in this bug report.


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