Bug 749111

SELinux is preventing nacl_helper_boo from 'mmap_zero' accesses on the memprotect Unknown.

*****  Plugin mmap_zero (83.8 confidence) suggests  **************************

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

*****  Plugin leaks (8.83 confidence) suggests  ******************************

If you want to ignore nacl_helper_boo trying to mmap_zero access the Unknown memprotect, 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 nacl_helper_boo /var/log/audit/audit.log | audit2allow -D -M mypol
# semodule -i mypol.pp

*****  Plugin catchall (8.83 confidence) suggests  ***************************

If you believe that nacl_helper_boo 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.
Do
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:chrome_sandbox_t:s0-s0:c
                              0.c1023
Target Context                unconfined_u:unconfined_r:chrome_sandbox_t:s0-s0:c
                              0.c1023
Target Objects                Unknown [ memprotect ]
Source                        nacl_helper_boo
Source Path                   nacl_helper_boo
Port                          <Unknown>
Host                          (removed)
Source RPM Packages           
Target RPM Packages           
Policy RPM                    selinux-policy-3.9.16-44.fc15
Selinux Enabled               True
Policy Type                   targeted
Enforcing Mode                Enforcing
Host Name                     (removed)
Platform                      Linux (removed) 2.6.40.7-0.fc15.x86_64 #1 SMP Mon
                              Oct 17 18:23:57 UTC 2011 x86_64 x86_64
Alert Count                   3
First Seen                    Wed 26 Oct 2011 01:45:04 PM WIT
Last Seen                     Wed 26 Oct 2011 02:20:50 PM WIT
Local ID                      81f5d452-9984-40a7-8f09-e31d2569c5c9

Raw Audit Messages
type=AVC msg=audit(1319613650.399:297): avc:  denied  { mmap_zero } for  pid=16663 comm="nacl_helper_boo" scontext=unconfined_u:unconfined_r:chrome_sandbox_t:s0-s0:c0.c1023 tcontext=unconfined_u:unconfined_r:chrome_sandbox_t:s0-s0:c0.c1023 tclass=memprotect


type=SYSCALL msg=audit(1319613650.399:297): arch=x86_64 syscall=execve success=no exit=EACCES a0=7f7df70bd928 a1=7f7df70d2ee0 a2=7fff57d5d180 a3=7fff57d58fc0 items=0 ppid=1 pid=16663 auid=500 uid=500 gid=500 euid=500 suid=500 fsuid=500 egid=500 sgid=500 fsgid=500 tty=(none) ses=1 comm=nacl_helper_boo subj=unconfined_u:unconfined_r:chrome_sandbox_t:s0-s0:c0.c1023 key=(null)

Hash: nacl_helper_boo,chrome_sandbox_t,chrome_sandbox_t,memprotect,mmap_zero

audit2allow

#============= chrome_sandbox_t ==============
allow chrome_sandbox_t self:memprotect mmap_zero;

audit2allow -R

#============= chrome_sandbox_t ==============
allow chrome_sandbox_t self:memprotect mmap_zero;