Re: [ANNOUNCE] Release Digsig 1.5: kernel module for run-timeauthentication of binaries

[Arjan van de Ven <arjan@infradead.org>]

On Tue, 2006-04-25 at 18:11 +0200, Axelle Apvrille wrote:
> Hi all,
> 
> Just my few cents on signed binaries and DigSig. It's
> kind of a very partial reply to several parts of
> various emails (Arjan, Ulrich, Nix ...), sorry for
> that ;-)
> 
> 1- "does this also prevent people writing their own
> elf loader in a bit of perl and just mmap the code"
> 
> I'm not sure to exactly understand what you mean:
> 
> - if you mean writing an application able to read &
> 'interpret' an ELF executable: again, I think DigSig
> will prevent this, because when you mmap the code,
> this calls (at kernel level) do_mmap which triggers an
> LSM hook called file_mmap. And we implement checks in
> that hook...

this is not correct, you don't need mmap you can do a read just fine as
well.


> - finally, note you also have choice not to sign this
> elf loader of yours. If it isn't signed, it won't ever
> run ;-)

so you didn't sign perl ? or bash ?