Bug 970830 - SELinux is preventing /usr/libexec/ibus-engine-kkc (deleted) from 'mmap_zero' accesses on the memprotect .
Summary: SELinux is preventing /usr/libexec/ibus-engine-kkc (deleted) from 'mmap_zero'...
Status: CLOSED DUPLICATE of bug 490753
Alias: None
Product: Fedora
Classification: Fedora
Component: ibus-kkc (Show other bugs)
(Show other bugs)
Version: 18
Hardware: i686 Unspecified
Target Milestone: ---
Assignee: Daiki Ueno
QA Contact: Fedora Extras Quality Assurance
Whiteboard: abrt_hash:442c02d0d12dff8e343b8042df8...
Keywords: Reopened
Depends On:
TreeView+ depends on / blocked
Reported: 2013-06-05 03:03 UTC by Mamoru TASAKA
Modified: 2013-06-10 00:59 UTC (History)
8 users (show)

Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of:
Last Closed: 2013-06-07 14:45:45 UTC
Type: ---
Regression: ---
Mount Type: ---
Documentation: ---
Verified Versions:
Category: ---
oVirt Team: ---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: ---

Attachments (Terms of Use)

Description Mamoru TASAKA 2013-06-05 03:03:41 UTC
Description of problem:
Don't know exact procedure to reproduce this.
SELinux is preventing /usr/libexec/ibus-engine-kkc (deleted) from 'mmap_zero' accesses on the memprotect .

*****  Plugin mmap_zero (53.1 confidence) suggests  **************************

If /usr/libexec/ibus-engine-kkc (deleted) は kernel で low メモリにmmapする必要はありません。
Then ハッカーから攻撃されている可能性があります。これは非常に危険なアクセスです。

*****  Plugin catchall_boolean (42.6 confidence) suggests  *******************

If control the ability to mmap a low area of the address space, as configured by /proc/sys/kernel/mmap_min_addr. がしたい
Then you must tell SELinux about this by enabling the 'mmap_low_allowed' boolean.
詳細情報については、'unconfined_selinux' man ページをご覧下さい。
setsebool -P mmap_low_allowed 1

*****  Plugin catchall (5.76 confidence) suggests  ***************************

If ibus-engine-kkc (deleted) に、  memprotect の mmap_zero アクセスがデフォルトで許可されるべきです。   
Then バグとして報告してください。 
ローカルのポリシーモジュールを生成すると、 このアクセスを許可することができます。
# grep ibus-engine-kkc /var/log/audit/audit.log | audit2allow -M mypol
# semodule -i mypol.pp

Additional Information:
Source Context                unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1
Target Context                unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1
Target Objects                 [ memprotect ]
Source                        ibus-engine-kkc
Source Path                   /usr/libexec/ibus-engine-kkc (deleted)
Port                          <Unknown>
Host                          (removed)
Source RPM Packages           
Target RPM Packages           
Policy RPM                    selinux-policy-3.11.1-97.fc18.noarch
Selinux Enabled               True
Policy Type                   targeted
Enforcing Mode                Enforcing
Host Name                     (removed)
Platform                      Linux (removed) 3.9.4-200.fc18.i686 #1 SMP Fri May
                              24 20:35:02 UTC 2013 i686 i686
Alert Count                   3
First Seen                    2013-05-13 15:44:20 JST
Last Seen                     2013-06-05 11:32:23 JST
Local ID                      1ae5e6df-7fad-4a0d-8a9e-7992ac991c39

Raw Audit Messages
type=AVC msg=audit(1370399543.616:889): avc:  denied  { mmap_zero } for  pid=4594 comm="ibus-engine-kkc" scontext=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023 tcontext=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023 tclass=memprotect

type=SYSCALL msg=audit(1370399543.616:889): arch=i386 syscall=mmap2 success=no exit=EACCES a0=0 a1=ca363 a2=1 a3=1 items=0 ppid=4339 pid=4594 auid=500 uid=500 gid=500 euid=500 suid=500 fsuid=500 egid=500 sgid=500 fsgid=500 ses=2 tty=(none) comm=ibus-engine-kkc exe=2F7573722F6C6962657865632F696275732D656E67696E652D6B6B63202864656C6574656429 subj=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023 key=(null)

Hash: ibus-engine-kkc,unconfined_t,unconfined_t,memprotect,mmap_zero


#============= unconfined_t ==============
#!!!! This avc can be allowed using the boolean 'mmap_low_allowed'

allow unconfined_t self:memprotect mmap_zero;

audit2allow -R
require {
	type unconfined_t;
	class memprotect mmap_zero;

#============= unconfined_t ==============
#!!!! This avc can be allowed using the boolean 'mmap_low_allowed'

allow unconfined_t self:memprotect mmap_zero;

Additional info:
reporter:       libreport-2.1.4
hashmarkername: setroubleshoot
kernel:         3.9.4-200.fc18.i686
type:           libreport

Comment 1 Miroslav Grepl 2013-06-07 08:49:33 UTC
Does the app work correctly? The alert tells you what to do.

Comment 2 Mamoru TASAKA 2013-06-07 12:34:27 UTC
Umm?? /usr/libexec/ibus-engine-kkc is in ibus-kkc-1.5.13-1.fc18 (i.e. Fedora's package), not some external one. So policy should be set by selinux-policy, not by myself, or ibus-kkc should be fixed.

Reopening. Would you tell me why "I" should fix by myself?

Comment 3 Daniel Walsh 2013-06-07 13:27:50 UTC
THen this is a bug in ibus, it should not require this access.

Comment 4 Eric Paris 2013-06-07 14:45:45 UTC

*** This bug has been marked as a duplicate of bug 490753 ***

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