linux-kernel - Re: [PATCH v6 05/14] x86: Secure Launch main header file

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Date:   Fri, 12 May 2023 12:00:03 +0100
From:   Matthew Garrett <mjg59@...f.ucam.org>
To:     Ross Philipson <ross.philipson@...cle.com>
Cc:     linux-kernel@...r.kernel.org, x86@...nel.org,
        linux-integrity@...r.kernel.org, linux-doc@...r.kernel.org,
        linux-crypto@...r.kernel.org, iommu@...ts.linux-foundation.org,
        kexec@...ts.infradead.org, linux-efi@...r.kernel.org,
        dpsmith@...rtussolutions.com, tglx@...utronix.de, mingo@...hat.com,
        bp@...en8.de, hpa@...or.com, ardb@...nel.org,
        James.Bottomley@...senpartnership.com, luto@...capital.net,
        nivedita@...m.mit.edu, kanth.ghatraju@...cle.com,
        trenchboot-devel@...glegroups.com
Subject: Re: [PATCH v6 05/14] x86: Secure Launch main header file

On Thu, May 04, 2023 at 02:50:14PM +0000, Ross Philipson wrote:

> +static inline int tpm12_log_event(void *evtlog_base, u32 evtlog_size,
> +				  u32 event_size, void *event)
> +{
> +	struct tpm12_event_log_header *evtlog =
> +		(struct tpm12_event_log_header *)evtlog_base;
> +
> +	if (memcmp(evtlog->signature, TPM12_EVTLOG_SIGNATURE,
> +		   sizeof(TPM12_EVTLOG_SIGNATURE)))
> +		return -EINVAL;
> +
> +	if (evtlog->container_size > evtlog_size)
> +		return -EINVAL;
> +
> +	if (evtlog->next_event_offset + event_size > evtlog->container_size)
> +		return -E2BIG;
> +
> +	memcpy(evtlog_base + evtlog->next_event_offset, event, event_size);
> +	evtlog->next_event_offset += event_size;
> +
> +	return 0;
> +}
> +
> +static inline int tpm20_log_event(struct txt_heap_event_log_pointer2_1_element *elem,
> +				  void *evtlog_base, u32 evtlog_size,
> +				  u32 event_size, void *event)
> +{
> +	struct tcg_pcr_event *header =
> +		(struct tcg_pcr_event *)evtlog_base;
> +
> +	/* Has to be at least big enough for the signature */
> +	if (header->event_size < sizeof(TCG_SPECID_SIG))
> +		return -EINVAL;
> +
> +	if (memcmp((u8 *)header + sizeof(struct tcg_pcr_event),
> +		   TCG_SPECID_SIG, sizeof(TCG_SPECID_SIG)))
> +		return -EINVAL;
> +
> +	if (elem->allocated_event_container_size > evtlog_size)
> +		return -EINVAL;
> +
> +	if (elem->next_record_offset + event_size >
> +	    elem->allocated_event_container_size)
> +		return -E2BIG;
> +
> +	memcpy(evtlog_base + elem->next_record_offset, event, event_size);
> +	elem->next_record_offset += event_size;
> +
> +	return 0;
> +}
> +

These seem like they'd potentially be useful outside the context of SL, 
maybe put them in a more generic location? Very much a nice to have, not 
a blocker from my side.

> +/*
> + * External functions avalailable in mainline kernel.

Nit: "available"