finit_module

[Richard Guy Briggs]

On 14/04/04, Richard Guy Briggs wrote:
> On 14/04/04, Steve Grubb wrote:
> > Hello,
> > 
> > In checking a system with newish kernel, 3.13.7, I noticed that sometimes 
> > finit_module is producing PATH records. Why?
> 
> Probably because modprobe is walking the
> 	/lib/modules/$(uname -r)/kernel/
> tree looking for the module named.

Is modprobe forcing a depmod to run, populating:
	/lib/modules/$(uname -r)/modules.*

Does this happen at most once per boot?

> But...  why are all the pathnames null?

Did you try to track down what some of the dev/inode pathnames were?

The number does seem high for this though, since they appear to all be
CREATE records.


Do you have a test to provoke it?  A set of rules and a test command?

> > type=PATH msg=audit(04/04/2014 07:28:45.177:408) : item=1 name=(null) 
> > inode=21788 dev=00:06 mode=dir,755 ouid=root ogid=root rdev=00:00 
> > obj=system_u:object_r:debugfs_t:s0 nametype=CREATE 
> > type=PATH msg=audit(04/04/2014 07:28:45.177:408) : item=0 name=(null) 
> > inode=165 dev=00:06 mode=dir,755 ouid=root ogid=root rdev=00:00 
> > obj=system_u:object_r:debugfs_t:s0 nametype=PARENT 
> > type=SYSCALL msg=audit(04/04/2014 07:28:45.177:408) : arch=x86_64 
> > syscall=finit_module success=yes exit=0 a0=0x0 a1=0x41a396 a2=0x0 a3=0x0 
> > items=1348 ppid=1369 pid=1370 auid=unset uid=root gid=root euid=root suid=root 
> > fsuid=root egid=root sgid=root fsgid=root ses=unset tty=(none) comm=modprobe 
> > exe=/usr/bin/kmod subj=system_u:system_r:insmod_t:s0 key=module-load
> > 
> > Also, when it does this, it makes a whole lot of them:
> > 
> > type=PATH msg=audit(04/04/2014 07:28:45.177:408) : item=1347 name=(null) 
> > inode=22461 dev=00:06 mode=dir,755 ouid=root ogid=root rde
> > v=00:00 obj=system_u:object_r:debugfs_t:s0 nametype=CREATE 
> > 
> > Seriously, 1347 auxiliary records? Why?
> > 
> > -Steve
> 
> - RGB

- RGB

--
Richard Guy Briggs <rbriggs at redhat.com>
Senior Software Engineer, Kernel Security, AMER ENG Base Operating Systems, Red Hat
Remote, Ottawa, Canada
Voice: +1.647.777.2635, Internal: (81) 32635, Alt: +1.613.693.0684x3545