Bug 1034745 - Selinux prevents steam big picture
Summary: Selinux prevents steam big picture
Keywords:
Status: CLOSED NOTABUG
Alias: None
Product: Fedora
Classification: Fedora
Component: selinux-policy
Version: 20
Hardware: Unspecified
OS: Unspecified
unspecified
unspecified
Target Milestone: ---
Assignee: Miroslav Grepl
QA Contact: Fedora Extras Quality Assurance
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2013-11-26 12:47 UTC by Robin Hack
Modified: 2013-11-26 19:48 UTC (History)
4 users (show)

Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Clone Of:
Environment:
Last Closed: 2013-11-26 19:48:31 UTC
Type: Bug


Attachments (Terms of Use)

Description Robin Hack 2013-11-26 12:47:42 UTC
Description of problem:


Version-Release number of selected component (if applicable):


How reproducible:
always


Steps to Reproduce:
1. Install steam
2. Log in steam account
3. Run Big Picture

Actual results:
Selinux denial

Expected results:
No selinux denial? :)

Additional info:
SELinux is preventing /home/baduser/.local/share/Steam/ubuntu12_32/steam from using the execheap access on a process.

*****  Plugin allow_execheap (53.1 confidence) suggests   ********************

If you do not think /home/baduser/.local/share/Steam/ubuntu12_32/steam should need to map heap memory that is both writable and executable.
Then you need to report a bug. This is a potentially dangerous access.
Do
contact your security administrator and report this issue.

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

If you want to allow selinuxuser to execheap
Then you must tell SELinux about this by enabling the 'selinuxuser_execheap' boolean.
You can read 'None' man page for more details.
Do
setsebool -P selinuxuser_execheap 1

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

If you believe that steam should be allowed execheap access on processes labeled unconfined_t 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 steam /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
                              023
Target Context                unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1
                              023
Target Objects                 [ process ]
Source                        steam
Source Path                   /home/baduser/.local/share/Steam/ubuntu12_32/steam
Port                          <Unknown>
Host                          unused-4-194.brq.redhat.com
Source RPM Packages           
Target RPM Packages           
Policy RPM                    selinux-policy-3.12.1-90.fc20.noarch
Selinux Enabled               True
Policy Type                   targeted
Enforcing Mode                Enforcing
Host Name                     unused-4-194.brq.redhat.com
Platform                      Linux unused-4-194.brq.redhat.com
                              3.11.9-300.fc20.x86_64 #1 SMP Wed Nov 20 22:23:25
                              UTC 2013 x86_64 x86_64
Alert Count                   1
First Seen                    2013-11-26 13:41:14 CET
Last Seen                     2013-11-26 13:41:14 CET
Local ID                      bfbd191a-11ac-4077-bc61-0a61263b1f0b

Raw Audit Messages
type=AVC msg=audit(1385469674.366:637): avc:  denied  { execheap } for  pid=6389 comm="steam" scontext=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023 tcontext=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023 tclass=process


type=SYSCALL msg=audit(1385469674.366:637): arch=i386 syscall=capget success=no exit=EACCES a0=c2c6000 a1=c000 a2=7 a3=ffb4210c items=0 ppid=4827 pid=6389 auid=20787 uid=20787 gid=20787 euid=20787 suid=20787 fsuid=20787 egid=20787 sgid=20787 fsgid=20787 ses=1 tty=(none) comm=steam exe=/home/baduser/.local/share/Steam/ubuntu12_32/steam subj=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023 key=(null)

Hash: steam,unconfined_t,unconfined_t,process,execheap

Comment 1 Daniel Walsh 2013-11-26 19:48:31 UTC
The alert tells you what to do.

allow_execheap is dangerous and not something I would want to turn on.

http://www.akkadia.org/drepper/selinux-mem.html

Explains the memory protection.  If you want to run this app you can turn the protections off.

setsebool selinuxuser_execheap 1

And then turn it back on, when you are done

setsebool selinuxuser_execheap 0

Or turn it on permanently.

setsebool -P selinuxuser_execheap 1


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