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

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On 5/12/23 07:00, Matthew Garrett wrote:
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.

Yea we can look into finding a nice home somewhere in the TPM event log code for these.


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

Nit: "available"

Ack

Thanks






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