> On Apr 20, 2017, at 7:41 PM, Thiago Jung Bauermann <bauerman@xxxxxxxxxxxxxxxxxx> wrote: > > This patch introduces the appended_imasig keyword to the IMA policy syntax > to specify that a given hook should expect the file to have the IMA > signature appended to it. Here is how it can be used in a rule: > > appraise func=KEXEC_KERNEL_CHECK appraise_type=appended_imasig > appraise func=KEXEC_KERNEL_CHECK appraise_type=appended_imasig|imasig > > In the second form, IMA will accept either an appended signature or a > signature stored in the extended attribute. In that case, it will first > check whether there is an appended signature, and if not it will read it > from the extended attribute. > > The format of the appended signature is the same used for signed kernel > modules. This means that the file can be signed with the scripts/sign-file > tool, with a command line such as this: I would suggest naming the appraise_type as modsig (or some variant) to clarify that the format is defined by how module signatures are handled. Maybe we'd like to define a different appended/inline signature format for IMA in the future. -Mehmet
