MODSIGN: Provide module signing public keys to the kernel
Include a PGP keyring containing the public keys required to perform module
verification in the kernel image during build and create a special keyring
during boot which is then populated with keys of crypto type holding the public
keys found in the PGP keyring.
These can be seen by root:
[root@andromeda ~]# cat /proc/keys
07ad4ee0 I----- 1 perm 3f010000 0 0 crypto modsign.0: RSA 87b9b3bd []
15c7f8c3 I----- 1 perm 1f030000 0 0 keyring .module_sign: 1/4
...
It is probably worth permitting root to invalidate these keys, resulting in
their removal and preventing further modules from being loaded with that key.
Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
diff --git a/kernel/module-internal.h b/kernel/module-internal.h
index 033c17f..6114a13 100644
--- a/kernel/module-internal.h
+++ b/kernel/module-internal.h
@@ -9,5 +9,7 @@
* 2 of the Licence, or (at your option) any later version.
*/
+extern struct key *modsign_keyring;
+
extern int mod_verify_sig(const void *mod, unsigned long modlen,
const void *sig, unsigned long siglen);