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SubjectRe: [PATCH 5/6] MODSIGN: Export module signature definitions.
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Mimi Zohar <zohar@linux.vnet.ibm.com> wrote:

> On Tue, 2017-04-18 at 17:17 -0300, Thiago Jung Bauermann wrote:
> > IMA will use the module_signature format for append signatures, so export
> > the relevant definitions and factor out the code which verifies that the
> > appended signature trailer is valid.
> >
> > Also, create a CONFIG_MODULE_SIG_FORMAT option so that IMA can select it
> > and be able to use validate_module_signature without having to depend on
> > CONFIG_MODULE_SIG.
>
> Basically we want to generalize the concept of an appended signature.
>  Referring to it as a "module signature format" seems a bit confusing.
>
> David, would you have a problem with changing the appended string from
> "~Module signature appended~\n" to something more generic?

Conceptually, no. Is it possible that doing so could break someone's module
that they load on multiple versions of the kernel? Say a module that only
exports things and doesn't use anything from the core or any other module.

Also, it needs to reasonably long and distinct enough to prevent a false
positive match.

David

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