linux-kernel - Re: [PATCH] modsign: use all trusted keys to verify module signature

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Date:   Tue, 6 Nov 2018 13:35:40 +0100
From:   Jessica Yu <jeyu@...nel.org>
To:     Ke Wu <mikewu@...gle.com>
Cc:     David Howells <dhowells@...hat.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] modsign: use all trusted keys to verify module signature

+++ Ke Wu [22/10/18 15:26 -0700]:
>Make mod_verify_sig to use all trusted keys. This allows keys in
>secondary_trusted_keys to be used to verify PKCS#7 signature on a
>kernel module.
>
>Signed-off-by: Ke Wu <mikewu@...gle.com>
>---
> kernel/module_signing.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
>diff --git a/kernel/module_signing.c b/kernel/module_signing.c
>index f2075ce8e4b3..a8b923ba1a39 100644
>--- a/kernel/module_signing.c
>+++ b/kernel/module_signing.c
>@@ -83,6 +83,6 @@ int mod_verify_sig(const void *mod, struct load_info *info)
> 	}
>
> 	return verify_pkcs7_signature(mod, modlen, mod + modlen, sig_len,
>-				      NULL, VERIFYING_MODULE_SIGNATURE,
>+				      (void *)1UL, VERIFYING_MODULE_SIGNATURE,
> 				      NULL, NULL);
> }

I've just stumbled on commit 817aef260037f ("Replace magic for trusting
the secondary keyring with #define"), so we should probably use
VERIFY_USE_SECONDARY_KEYRING in place of (void *)1UL.

Thanks,

Jessica