[PATCH 09/24] kexec_file: Disable at runtime if securelevel has been set

David Howells dhowells at redhat.com
Fri Apr 7 07:09:54 UTC 2017


Mimi Zohar <zohar at linux.vnet.ibm.com> wrote:

> > > +	if (!IS_ENABLED(CONFIG_KEXEC_VERIFY_SIG) && kernel_is_locked_down())
> > > +		return -EPERM;
> > > +
> > >  
> 
> IMA can be used to verify file signatures too, based on the LSM hooks
> in  kernel_read_file_from_fd().  CONFIG_KEXEC_VERIFY_SIG should not be
> required.

Okay, fair enough.  I can stick in an OR with an IS_ENABLED on some IMA
symbol.  CONFIG_IMA_KEXEC maybe?  And also require IMA be enabled?

David
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