linux-kernel - Re: [PATCH v7 3/5] certs: Make blacklist_vet

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Date:   Thu, 21 Apr 2022 17:27:42 +0200
From:   Mickaël Salaün <mic@...ikod.net>
To:     Jarkko Sakkinen <jarkko@...nel.org>,
        David Howells <dhowells@...hat.com>
Cc:     David Woodhouse <dwmw2@...radead.org>,
        "David S . Miller" <davem@...emloft.net>,
        Eric Snowberg <eric.snowberg@...cle.com>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        James Morris <jmorris@...ei.org>,
        Mickaël Salaün <mic@...ux.microsoft.com>,
        Mimi Zohar <zohar@...ux.ibm.com>,
        "Serge E . Hallyn" <serge@...lyn.com>,
        Tyler Hicks <tyhicks@...ux.microsoft.com>,
        keyrings@...r.kernel.org, linux-crypto@...r.kernel.org,
        linux-integrity@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-security-module@...r.kernel.org
Subject: Re: [PATCH v7 3/5] certs: Make blacklist_vet_description() more
 strict


On 21/04/2022 17:12, Jarkko Sakkinen wrote:
> On Wed, Apr 20, 2022 at 11:29:08AM +0100, David Howells wrote:
>> Mickaël Salaün <mic@...ikod.net> wrote:
>>
>>> +	/* The following algorithm only works if prefix lengths match. */
>>> +	BUILD_BUG_ON(sizeof(tbs_prefix) != sizeof(bin_prefix));
>>> +	prefix_len = sizeof(tbs_prefix) - 1;
>>> +	for (i = 0; *desc; desc++, i++) {
>>> +		if (*desc == ':') {
>>> +			if (tbs_step == prefix_len)
>>> +				goto found_colon;
>>> +			if (bin_step == prefix_len)
>>> +				goto found_colon;
>>> +			return -EINVAL;
>>> +		}
>>> +		if (i >= prefix_len)
>>> +			return -EINVAL;
>>> +		if (*desc == tbs_prefix[i])
>>> +			tbs_step++;
>>> +		if (*desc == bin_prefix[i])
>>> +			bin_step++;
>>> +	}
>>
>> I wonder if:
>>
>> 	static const char tbs_prefix[] = "tbs:";
>> 	static const char bin_prefix[] = "bin:";
>>
>> 	if (strncmp(desc, tbs_prefix, sizeof(tbs_prefix) - 1) == 0 ||
>> 	    strncmp(desc, bin_prefix, sizeof(bin_prefix) - 1) == 0)
>> 		goto found_colon;
>>
>> might be better.
>>
>> David
> 
> I think it'd be.
> 
> BR, Jarkko

I'm confused. Didn't you plan to send this patch series before 
v5.18-rc2? It's been a while since I started working on this.