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MdeModulePkg/Library/VarCheckLib: Allow SetVariable from SMM

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REF: https://bugzilla.tianocore.org/show_bug.cgi?id=3154

Update VarCheckLibSetVariableCheck() to allow locked variables
to be updated if the RequestSource is VarCheckFromTrusted even
if one or more variable check handlers return EFI_WRITE_PROTECTED.
RequestSource is only set to VarCheckFromTrusted if the request
is through the EFI_SMM_VARAIBLE_PROTOCOL.

Cc: Bret Barkelew <Bret.Barkelew@microsoft.com>
Cc: Hao A Wu <hao.a.wu@intel.com>
Cc: Liming Gao <gaoliming@byosoft.com.cn>
Signed-off-by: Michael D Kinney <michael.d.kinney@intel.com>
Reviewed-by: Bret Barkelew <bret.barkelew@microsoft.com>
Reviewed-by: Hao A Wu <hao.a.wu@intel.com>
(cherry picked from commit 248d08c598)
Reviewed-by: Liming Gao <gaoliming@byosoft.com.cn>
This commit is contained in:
Michael D Kinney 2021-01-05 19:48:55 -08:00 • committed by mergify[bot]
parent 184ece2d30
commit 75ab038d72
1 changed files with 8 additions and 1 deletions
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9
MdeModulePkg/Library/VarCheckLib/VarCheckLib.c
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@ -1,7 +1,7 @@
/** @file
Implementation functions and structures for var check services.
Copyright (c) 2015 - 2016, Intel Corporation. All rights reserved.<BR>
Copyright (c) 2015 - 2021, Intel Corporation. All rights reserved.<BR>
SPDX-License-Identifier: BSD-2-Clause-Patent
**/
@ -655,6 +655,13 @@ VarCheckLibSetVariableCheck (
DataSize,
Data
);
if (Status == EFI_WRITE_PROTECTED && RequestSource == VarCheckFromTrusted) {
//
// If RequestSource is trusted, then allow variable to be set even if it
// is write protected.
//
continue;
}
if (EFI_ERROR (Status)) {
DEBUG ((EFI_D_INFO, "Variable Check handler fail %r - %g:%s\n", Status, VendorGuid, VariableName));
return Status;