Building Hello World LSM

[Tian Dave]

Then which LSM was triggered? SELinux? You probably need to disable other
LSM before making your LSM work.

Thanks,
Dave

2015-01-18 18:49 GMT-05:00 Thomas F. J.-M. Pasquier <tfjmp2 at cam.ac.uk>:

> Hi everyone,
>
> Kernel version 3.17.8
>
> I am trying to build a skeleton LSM module, but I am not having much luck
> so far. The problem seems to be that the LSM init function is never called.
>
> I am selecting my helloworld LSM when building the kernel and it is set as
> default (checked and re-checked in menuconfig + in the file).
>
> The build is going fine (my module is built as I would expect). The rest
> of the building procedure goes fine. I reboot, the new image works just
> fine except my LSM is not in (nor any other, it seems, for that matter).
>
> Here is the init function:
> static __init int hw_init(void){
> /* avoid security registration races */
> if (!security_module_enable(&hw_ops)){
> printk(KERN_INFO "hw:  Disabled at boot.\n");
> return 0;
> }
>
> printk(KERN_INFO "hw:  Initializing.\n");
>
> if (register_security(&hw_ops))
> panic("hw: Unable to register with kernel.\n");
> else
> printk(KERN_INFO "hw: registered with the kernel.\n");
>
> return 0;
> }
>
> security_initcall(hw_init);
>
> I looked at how it was done in SELinux and the other security module and I
> don't seem to be doing things differently or incorrectly. I checked the log
> level just in case and that's not the issue either.
>
> I am tempted to say the problem come from my building
> procedure/configuration, rather than the module/code in itself (the dist on
> top of the kernel is fedora21). I have been at it for a while now and any
> help would be most welcomed.
>
> Thank you in advance.
>
> Regards,
> Thomas
>
>
>
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