Bug 757177

Summary: SELinux is preventing /sbin/consoletype from read access on the chr_file /dev/null
Product: [Fedora] Fedora Reporter: Ralf Corsepius <rc040203>
Component: selinux-policyAssignee: Miroslav Grepl <mgrepl>
Status: CLOSED DUPLICATE QA Contact: Fedora Extras Quality Assurance <extras-qa>
Severity: unspecified Docs Contact:
Priority: unspecified    
Version: 16CC: dominick.grift, dwalsh, mgrepl
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Fixed In Version: Doc Type: Bug Fix
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Last Closed: 2011-12-05 11:50:01 UTC Type: ---
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Description Ralf Corsepius 2011-11-25 17:16:01 UTC
Description of problem:

See subject.

Version-Release number of selected component (if applicable):
selinux-policy-3.10.0-56.fc16.noarch
selinux-policy-targeted-3.10.0-56.fc16.noarch


How reproducible:
No idea.

Steps to Reproduce:
No idea.

I was building an f15 package in a local mock-chroot on F16 when SELinux rose this warning.


Actual results:

# sealert -l 478fdd4d-9d85-438c-8603-b05deba84576
SELinux is preventing /sbin/consoletype from read access on the chr_file /dev/null.

*****  Plugin restorecon (98.5 confidence) suggests  *************************

If you want to fix the label. 
/dev/null default label should be null_device_t.
Then you can run restorecon.
Do
# /sbin/restorecon -v /dev/null

*****  Plugin leaks (1.48 confidence) suggests  ******************************

If you want to ignore consoletype trying to read access the null chr_file, because you believe it should not need this access.
Then you should report this as a bug.  
You can generate a local policy module to dontaudit this access.
Do
# grep /sbin/consoletype /var/log/audit/audit.log | audit2allow -D -M mypol
# semodule -i mypol.pp

*****  Plugin catchall (1.48 confidence) suggests  ***************************

If you believe that consoletype should be allowed read access on the null chr_file by default.
Then you should report this as a bug.
You can generate a local policy module to allow this access.
Do
allow this access for now by executing:
# grep consoletype /var/log/audit/audit.log | audit2allow -M mypol
# semodule -i mypol.pp


Additional info:
I am occasionally observing f15-mock chroots to do bizarre things (e.g. to kill ypbind). My guess is something in f15 or in mock is massively leaking.

Comment 1 Ralf Corsepius 2011-11-26 03:05:12 UTC
Update: This SEalert seems to originate from a package's _testsuite_,
which deliberately tries to open /dev/null for reading.

Comment 2 Miroslav Grepl 2011-11-28 11:19:00 UTC
Could you add full AVC msg?

# grep consoletype /var/log/audit/audit.log

Comment 3 Ralf Corsepius 2011-11-28 11:59:20 UTC
Here it is:

# grep consoletype /var/log/audit/audit.log

type=AVC msg=audit(1322290024.889:2186): avc:  denied  { read } for  pid=1433 comm="consoletype" path="/dev/null" dev=sda3 ino=2359815 scontext=unconfined_u:system_r:consoletype_t:s0 tcontext=unconfined_u:object_r:mock_var_lib_t:s0 tclass=chr_file
type=AVC msg=audit(1322290024.889:2186): avc:  denied  { write } for  pid=1433 comm="consoletype" path="/dev/null" dev=sda3 ino=2359815 scontext=unconfined_u:system_r:consoletype_t:s0 tcontext=unconfined_u:object_r:mock_var_lib_t:s0 tclass=chr_file
type=SYSCALL msg=audit(1322290024.889:2186): arch=c000003e syscall=59 success=yes exit=0 a0=6fc9d0 a1=707140 a2=707390 a3=7fffd43437b0 items=0 ppid=1432 pid=1433 auid=8690 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0 tty=(none) ses=2 comm="consoletype" exe="/sbin/consoletype" subj=unconfined_u:system_r:consoletype_t:s0 key=(null)



FYI: I meanwhile have a deterministic reproducer: One of these is rebuilding the perl-Plack package (From Fedora's git/master or rawhide) in a fedora-rawhide mock on fedora-16.

Comment 4 Ralf Corsepius 2011-12-05 04:18:41 UTC
Another reproducer: 

Rebuild the perl-Starlet package from fedora's git in mock on fedora-16.

Comment 5 Miroslav Grepl 2011-12-05 11:50:01 UTC
We have the similar bug.

*** This bug has been marked as a duplicate of bug 745287 ***