linux-kernel - Re: [PATCH] certs: always use secondary keyring first if possible

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Date:   Thu, 14 Dec 2017 18:25:13 +0800
From:   Dave Young <dyoung@...hat.com>
To:     David Howells <dhowells@...hat.com>
Cc:     keyrings@...r.kernel.org, linux-kernel@...r.kernel.org,
        kexec@...ts.infradead.org, David Woodhouse <dwmw2@...radead.org>
Subject: Re: [PATCH] certs: always use secondary keyring first if possible

On 11/18/17 at 12:47pm, Dave Young wrote:
> Commit d3bfe84129f6 introduced secondary_trusted_keys keyring, current
> users of verify_pkcs7_signature are below:
> net/wireless/reg.c : uses its own trusted_keys
> kernel/module_signing.c : pass NULL trusted_keys 
> crypto/asymmetric_keys/verify_pefile.c : pass NULL trusted_keys
> 
> For both module and pefile verification, there is no reason to use builtin
> keys only. Actually in Fedora kernel module signing code passes 1UL, but
> kexec code does not pass 1UL for pefile verification thus we have below bug
> https://bugzilla.redhat.com/show_bug.cgi?id=1470995
> 
> Drop the hard code 1UL checking so that pefile verification can use
> secondary keyring as well.
> 
> Signed-off-by: Dave Young <dyoung@...hat.com>
> ---
>  certs/system_keyring.c |    2 --
>  1 file changed, 2 deletions(-)
> 
> --- linux-x86.orig/certs/system_keyring.c
> +++ linux-x86/certs/system_keyring.c
> @@ -229,8 +229,6 @@ int verify_pkcs7_signature(const void *d
>  		goto error;
>  
>  	if (!trusted_keys) {
> -		trusted_keys = builtin_trusted_keys;
> -	} else if (trusted_keys == (void *)1UL) {
>  #ifdef CONFIG_SECONDARY_TRUSTED_KEYRING
>  		trusted_keys = secondary_trusted_keys;
>  #else

Another ping.

If the (-1UL) is really needed, below file need update to use it
But I think it is ugly..
crypto/asymmetric_keys/verify_pefile.c

Thanks
Dave