[fedora-india] Fwd: SELinux is preventing /usr/bin/skype from mmap_zero access on the memprotect Unknown.

anjaz ahmed anjazahmed at gmail.com
Tue Aug 9 11:53:33 UTC 2011


Dear friends,

Recently upgraded to Fedora 15, the skype application gets crashed
frequently.....The error details are as mentioned below. Would be great if
someone get it fixed.

Thanks

=====================================================================

SELinux is preventing /usr/bin/skype from mmap_zero access on the memprotect
Unknown.

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


If you do not think /usr/bin/skype 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 catchall_boolean (42.6 confidence) suggests *******************


If you want to control the ability to mmap a low area of the address space,
as configured by /proc/sys/kernel/mmap_min_addr.
Then you must tell SELinux about this by enabling the 'mmap_low_allowed'
boolean.
Do
setsebool -P mmap_low_allowed 1

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


If you believe that skype 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 threaded-ml /var/log/audit/audit.log | audit2allow -M mypol
# semodule -i mypol.pp

Additional Information:
Source Context unconfined_u:unconfined_r:unconfined_execmem_t:s0-
s0:c0.c1023
Target Context unconfined_u:unconfined_r:unconfined_execmem_t:s0-
s0:c0.c1023
Target Objects Unknown [ memprotect ]
Source threaded-ml
Source Path /usr/bin/skype
Port <Unknown>
Host anjaz.intelvision.sc
Source RPM Packages skype-2.2.0.35-fc10
Target RPM Packages
Policy RPM selinux-policy-3.9.16-35.fc15
Selinux Enabled True
Policy Type targeted
Enforcing Mode Enforcing
Host Name anjaz.intelvision.sc
Platform Linux anjaz.intelvision.sc 2.6.38.8-35.fc15.x86_64
#1 SMP Wed Jul 6 13:58:54 UTC 2011 x86_64 x86_64
Alert Count 125
First Seen Tue 09 Aug 2011 03:49:24 PM SCT
Last Seen Tue 09 Aug 2011 03:49:27 PM SCT
Local ID 943f7e9f-e074-437d-9ad1-cf76ac9f7615

Raw Audit Messages
type=AVC msg=audit(1312890567.697:245): avc: denied { mmap_zero } for
pid=4405 comm="skype"
scontext=unconfined_u:unconfined_r:unconfined_execmem_t:s0-s0:c0.c1023
tcontext=unconfined_u:unconfined_r:unconfined_execmem_t:s0-s0:c0.c1023
tclass=memprotect


type=SYSCALL msg=audit(1312890567.697:245): arch=i386 syscall=lgetxattr
per=400000 success=no exit=EACCES a0=0 a1=1000 a2=3 a3=22 items=0 ppid=1769
pid=4405 auid=500 uid=500 gid=500 euid=500 suid=500 fsuid=500 egid=500
sgid=500 fsgid=500 tty=(none) ses=1 comm=skype exe=/usr/bin/skype
subj=unconfined_u:unconfined_r:unconfined_execmem_t:s0-s0:c0.c1023
key=(null)

Hash:
threaded-ml,unconfined_execmem_t,unconfined_execmem_t,memprotect,mmap_zero

audit2allow

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

allow unconfined_execmem_t self:memprotect mmap_zero;

audit2allow -R

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

allow unconfined_execmem_t self:memprotect mmap_zero;
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