Bug 1258210 - SELinux is preventing /opt/google/chrome/nacl_helper_bootstrap from 'mmap_zero' accesses on the memprotect Unknown.
Summary: SELinux is preventing /opt/google/chrome/nacl_helper_bootstrap from 'mmap_zer...
Status: CLOSED DUPLICATE of bug 859625
Alias: None
Product: Fedora
Classification: Fedora
Component: selinux-policy
Version: 22
Hardware: i686
OS: Unspecified
Target Milestone: ---
Assignee: Miroslav Grepl
QA Contact: Fedora Extras Quality Assurance
Whiteboard: abrt_hash:c33ae18f1c9fab33802eeef9aa6...
Depends On:
TreeView+ depends on / blocked
Reported: 2015-08-30 10:14 UTC by Otto J. Makela
Modified: 2015-08-31 12:15 UTC (History)
5 users (show)

Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Clone Of:
Last Closed: 2015-08-31 12:15:53 UTC
Type: ---

Attachments (Terms of Use)

Description Otto J. Makela 2015-08-30 10:14:49 UTC
Description of problem:
Starting Chrome normally.
SELinux is preventing /opt/google/chrome/nacl_helper_bootstrap from 'mmap_zero' accesses on the memprotect Unknown.

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

If you do not think /opt/google/chrome/nacl_helper_bootstrap should need to mmap low memory in the kernel.
Then you may be under attack by a hacker, this is a very dangerous access.
contact your security administrator and report this issue.

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

If you want to allow mmap to low allowed
Then you must tell SELinux about this by enabling the 'mmap_low_allowed' boolean.
You can read 'None' man page for more details.
setsebool -P mmap_low_allowed 1

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

If you believe that nacl_helper_bootstrap should be allowed mmap_zero access on the Unknown memprotect by default.
Then you should report this as a bug.
You can generate a local policy module to allow this access.
allow this access for now by executing:
# grep nacl_helper_boo /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                Unknown [ memprotect ]
Source                        nacl_helper_boo
Source Path                   /opt/google/chrome/nacl_helper_bootstrap
Port                          <Unknown>
Host                          (removed)
Source RPM Packages           google-chrome-stable-44.0.2403.157-1.i386
Target RPM Packages           
Policy RPM                    selinux-policy-3.13.1-128.12.fc22.noarch
Selinux Enabled               True
Policy Type                   targeted
Enforcing Mode                Enforcing
Host Name                     (removed)
Platform                      Linux (removed) 4.1.5-200.fc22.i686 #1 SMP Tue Aug
                              11 00:11:41 UTC 2015 i686 i686
Alert Count                   23
First Seen                    2015-08-28 22:13:11 EEST
Last Seen                     2015-08-30 13:00:28 EEST
Local ID                      31086ff6-d011-4a59-8e0c-c20e9b1a59ef

Raw Audit Messages
type=AVC msg=audit(1440928828.40:1072): avc:  denied  { mmap_zero } for  pid=25507 comm="nacl_helper_boo" scontext=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023 tcontext=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023 tclass=memprotect permissive=0

type=SYSCALL msg=audit(1440928828.40:1072): arch=i386 syscall=mmap2 success=no exit=EACCES a0=f000 a1=1000 a2=0 a3=4032 items=0 ppid=25505 pid=25507 auid=1000 uid=1000 gid=1000 euid=1000 suid=1000 fsuid=1000 egid=1000 sgid=1000 fsgid=1000 tty=tty2 ses=3 comm=nacl_helper_boo exe=/opt/google/chrome/nacl_helper_bootstrap subj=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023 key=(null)

Hash: nacl_helper_boo,unconfined_t,unconfined_t,memprotect,mmap_zero

Version-Release number of selected component:

Additional info:
reporter:       libreport-2.6.2
hashmarkername: setroubleshoot
kernel:         4.1.5-200.fc22.i686
type:           libreport

Potential duplicate: bug 859625

Comment 1 Miroslav Grepl 2015-08-31 12:15:53 UTC

*** This bug has been marked as a duplicate of bug 859625 ***

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