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MODSIGN: Provide module signing public keys to the kernel

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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>
This commit is contained in:
David Howells
2012-09-26 10:09:51 +01:00
committed by Rusty Russell
parent d441108c6f
commit 631cc66eb9
3 changed files with 124 additions and 2 deletions
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2
kernel/module-internal.h
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@@ -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);