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

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On 5/12/23 9:10 AM, Ross Philipson wrote:
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.

After looking at it, it seems we would have to drag a whole bunch of TXT related structures into the TPM event log code. I don't think this is really worth it for what these functions do.

Thanks
Ross



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

Nit: "available"

Ack

Thanks







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