Re: Where does linux kernel call initial policy load

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On Wed, 2011-10-26 at 13:18 -0400, Stephen Smalley wrote:
> On Wed, 2011-10-26 at 10:11 -0700, Sam Gandhi wrote:
> > Hi,
> > 
> > I am not an expert in kernel source navigation. Anybody want to give
> > me clues as to where  does linux kernel load initial policy at
> > startup, even before the rcS scripts get started?
> > 
> > It looks like if  I have /etc/selinux/config file that says config is
> > as shown below
> > 
> > SELINUX=permissive
> > SELINUXTYPE=mypolicy
> > 
> > 
> > It looks like linux kernel is loading file
> > /etc/selinux/mypolicy/policy.24 I want to find out how that is getting
> > invoked. I see that it looks like it is triggered by write to selinux
> > sysfs entry /selinux/load but I want to find out where in the kernel
> > code is that write to /sexlinux/load generated?
> 
> Policy load is initiated by early userspace, not by the kernel.
> Typically by /sbin/init or from the initramfs.

Oh, and typically it happens by calling the selinux_init_load_policy()
function in libselinux.

-- 
Stephen Smalley
National Security Agency


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