Bug 732862 - SELinux is preventing /usr/sbin/lldpad from using the 'sys_module' capabilities.
Summary: SELinux is preventing /usr/sbin/lldpad from using the 'sys_module' capabilities.
Alias: None
Product: Fedora
Classification: Fedora
Component: selinux-policy-targeted
Version: 16
Hardware: x86_64
OS: Unspecified
Target Milestone: ---
Assignee: Miroslav Grepl
QA Contact: Ben Levenson
Whiteboard: abrt_hash:8abf41fd77118b4b216e2a653ac...
Depends On:
TreeView+ depends on / blocked
Reported: 2011-08-24 00:57 UTC by Stephen Lewis
Modified: 2013-02-13 18:48 UTC (History)
10 users (show)

Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Clone Of:
Last Closed: 2013-02-13 18:48:37 UTC

Attachments (Terms of Use)

Description Stephen Lewis 2011-08-24 00:57:31 UTC
abrt version: 2.0.5
executable:     /usr/bin/python
hashmarkername: setroubleshoot
kernel:         3.0.0-1.fc16.x86_64
reason:         SELinux is preventing /usr/sbin/lldpad from using the 'sys_module' capabilities.
time:           Tue Aug 23 17:55:44 2011

:SELinux is preventing /usr/sbin/lldpad from using the 'sys_module' capabilities.
:*****  Plugin sys_module (99.5 confidence) suggests  *************************
:If you do not believe that /usr/sbin/lldpad should be attempting to modify the kernel by loading a kernel module.
:Then a process might be attempting to hack into your system.
:contact your security administrator and report this issue.
:*****  Plugin catchall (1.49 confidence) suggests  ***************************
:If you believe that lldpad should have the sys_module capability 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 lldpad /var/log/audit/audit.log | audit2allow -M mypol
:# semodule -i mypol.pp
:Additional Information:
:Source Context                system_u:system_r:lldpad_t:s0
:Target Context                system_u:system_r:lldpad_t:s0
:Target Objects                Unknown [ capability ]
:Source                        lldpad
:Source Path                   /usr/sbin/lldpad
:Port                          <Unknown>
:Host                          (removed)
:Source RPM Packages           lldpad-0.9.43-1.fc16
:Target RPM Packages           
:Policy RPM                    selinux-policy-3.10.0-15.fc16
:Selinux Enabled               True
:Policy Type                   targeted
:Enforcing Mode                Enforcing
:Host Name                     (removed)
:Platform                      Linux (removed) 3.0.0-1.fc16.x86_64 #1 SMP Fri Jul
:                              22 16:09:29 UTC 2011 x86_64 x86_64
:Alert Count                   3
:First Seen                    Tue 23 Aug 2011 05:14:06 PM PDT
:Last Seen                     Tue 23 Aug 2011 05:50:04 PM PDT
:Local ID                      15c58b1b-9547-4cbb-8fd6-c62aa1c1c6b2
:Raw Audit Messages
:type=AVC msg=audit(1314147004.511:135): avc:  denied  { sys_module } for  pid=1016 comm="lldpad" capability=16  scontext=system_u:system_r:lldpad_t:s0 tcontext=system_u:system_r:lldpad_t:s0 tclass=capability
:type=SYSCALL msg=audit(1314147004.511:135): arch=x86_64 syscall=ioctl success=no exit=ENODEV a0=9 a1=8933 a2=7fffae31eaf0 a3=0 items=0 ppid=1 pid=1016 auid=4294967295 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0 tty=(none) ses=4294967295 comm=lldpad exe=/usr/sbin/lldpad subj=system_u:system_r:lldpad_t:s0 key=(null)
:Hash: lldpad,lldpad_t,lldpad_t,capability,sys_module
:#============= lldpad_t ==============
:allow lldpad_t self:capability sys_module;
:audit2allow -R
:#============= lldpad_t ==============
:allow lldpad_t self:capability sys_module;

Comment 1 Daniel Walsh 2011-08-24 02:43:04 UTC
Can't we not raise this call if we have ENODEV?  We are quickly going to be ignoring every network facing domain from executing sys_module.

I am thinking of just adding
dontaudit domain self:capability sys_module;

Comment 2 Dave Jones 2012-03-22 16:44:23 UTC
[mass update]
kernel-3.3.0-4.fc16 has been pushed to the Fedora 16 stable repository.
Please retest with this update.

Comment 3 Dave Jones 2012-03-22 16:48:47 UTC
[mass update]
kernel-3.3.0-4.fc16 has been pushed to the Fedora 16 stable repository.
Please retest with this update.

Comment 4 Dave Jones 2012-03-22 16:58:04 UTC
[mass update]
kernel-3.3.0-4.fc16 has been pushed to the Fedora 16 stable repository.
Please retest with this update.

Comment 5 Dave Jones 2012-08-15 14:38:38 UTC
any program that opens a socket with a protocol that isn't loaded yet is going to trigger a modprobe.

I'm not sure what you expect the kernel to do here.

Comment 6 Daniel Walsh 2012-08-15 18:13:22 UTC
The difference is whether or not the kernel_t is getting the modprobe versus the individual type.  Theoretically the kernel would only load kernel modules that it owns whereas allow a process to execute sys_module allows it to modify the kernel with its content.

Comment 7 Dave Jones 2012-08-15 18:37:59 UTC
I don't know how the contexts are passed around when networking does its request_module calls. Maybe something can be done there to force it to be kernel_t.  Eric ?

Comment 8 Stephen Smalley 2012-08-15 19:10:06 UTC
This is due to commit 8909c9?
If you add a netdev-* alias for the relevant modules, then it should only require CAP_NET_ADMIN here and not CAP_SYS_MODULE.

Comment 9 Fedora End Of Life 2013-01-16 15:41:26 UTC
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Approximately 4 (four) weeks from now Fedora will stop maintaining
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bug reports from releases that are no longer maintained. At that time
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Comment 10 Fedora End Of Life 2013-02-13 18:48:42 UTC
Fedora 16 changed to end-of-life (EOL) status on 2013-02-12. Fedora 16 is 
no longer maintained, which means that it will not receive any further 
security or bug fix updates. As a result we are closing this bug.

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