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From 58df8d745c6516818ba6ebfa8fe826702c1621a0 Mon Sep 17 00:00:00 2001
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From: Chris Coulson <chris.coulson@canonical.com>
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Date: Thu, 26 Sep 2019 20:01:01 +0100
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Subject: [PATCH 41/62] tpm: Don't log duplicate identical events
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According to the comment in tpm_measure_variable ("Don't measure something that we've already measured"), shim
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shouldn't measure duplicate events if they are identical, which also aligns with section 2.3.4.8 of the TCG PC
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Client Platform Firmware Profile Specification ("If it has been measured previously, it MUST NOT be measured
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again"). This is currently broken because tpm_data_measured() uses the return value of CompareGuid() incorrectly.
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Upstream-commit-id: 103adc89ce5
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---
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tpm.c | 2 +-
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1 file changed, 1 insertion(+), 1 deletion(-)
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diff --git a/tpm.c b/tpm.c
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index c0617bb479e..196b93c30f6 100644
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--- a/tpm.c
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+++ b/tpm.c
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@@ -241,7 +241,7 @@ static BOOLEAN tpm_data_measured(CHAR16 *VarName, EFI_GUID VendorGuid, UINTN Var
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for (i=0; i
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if ((StrCmp (VarName, measureddata[i].VariableName) == 0) &&
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- (CompareGuid (&VendorGuid, measureddata[i].VendorGuid)) &&
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+ (CompareGuid (&VendorGuid, measureddata[i].VendorGuid) == 0) &&
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(VarSize == measureddata[i].Size) &&
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(CompareMem (VarData, measureddata[i].Data, VarSize) == 0)) {
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return TRUE;
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--
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2.26.2
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