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From 73de814a5f30c2c6d82736082c1114a028d12115 Mon Sep 17 00:00:00 2001
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From: Laszlo Ersek <lersek@redhat.com>
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Date: Fri, 31 Jan 2020 12:42:41 +0100
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Subject: [PATCH 05/12] SecurityPkg/DxeImageVerificationHandler: narrow down
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PE/COFF hash status
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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RH-Author: Laszlo Ersek <lersek@redhat.com>
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Message-id: <20200131124248.22369-6-lersek@redhat.com>
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Patchwork-id: 93615
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O-Subject: [RHEL-8.2.0 edk2 PATCH 05/12] SecurityPkg/DxeImageVerificationHandler: narrow down PE/COFF hash status
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Bugzilla: 1751993
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RH-Acked-by: Philippe Mathieu-Daudé <philmd@redhat.com>
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RH-Acked-by: Vitaly Kuznetsov <vkuznets@redhat.com>
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Inside the "for" loop that scans the signatures of the image, we call
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HashPeImageByType(), and assign its return value to "Status".
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Beyond the immediate retval check, this assignment is useless (never
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consumed). That's because a subsequent access to "Status" may only be one
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of the following:
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- the "Status" assignment when we call HashPeImageByType() in the next
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iteration of the loop,
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- the "Status = EFI_ACCESS_DENIED" assignment right after the final
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"IsVerified" check.
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To make it clear that the assignment is only useful for the immediate
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HashPeImageByType() retval check, introduce a specific helper variable,
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called "HashStatus".
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This patch is a no-op, functionally.
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Cc: Chao Zhang <chao.b.zhang@intel.com>
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Cc: Jian J Wang <jian.j.wang@intel.com>
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Cc: Jiewen Yao <jiewen.yao@intel.com>
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Ref: https://bugzilla.tianocore.org/show_bug.cgi?id=2129
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Signed-off-by: Laszlo Ersek <lersek@redhat.com>
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Message-Id: <20200116190705.18816-5-lersek@redhat.com>
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Reviewed-by: Michael D Kinney <michael.d.kinney@intel.com>
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[lersek@redhat.com: push with Mike's R-b due to Chinese New Year
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Holiday: <https://edk2.groups.io/g/devel/message/53429>; msgid
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<d3fbb76dabed4e1987c512c328c82810@intel.com>]
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(cherry picked from commit 47650a5cab608e07c31d66bdb9b4cc6e58bdf22f)
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Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
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---
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.../Library/DxeImageVerificationLib/DxeImageVerificationLib.c | 5 +++--
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1 file changed, 3 insertions(+), 2 deletions(-)
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diff --git a/SecurityPkg/Library/DxeImageVerificationLib/DxeImageVerificationLib.c b/SecurityPkg/Library/DxeImageVerificationLib/DxeImageVerificationLib.c
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index e6c8a54..5cc82c1 100644
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--- a/SecurityPkg/Library/DxeImageVerificationLib/DxeImageVerificationLib.c
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+++ b/SecurityPkg/Library/DxeImageVerificationLib/DxeImageVerificationLib.c
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@@ -1581,6 +1581,7 @@ DxeImageVerificationHandler (
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UINT32 OffSet;
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CHAR16 *NameStr;
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RETURN_STATUS PeCoffStatus;
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+ EFI_STATUS HashStatus;
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SignatureList = NULL;
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SignatureListSize = 0;
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@@ -1802,8 +1803,8 @@ DxeImageVerificationHandler (
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continue;
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}
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- Status = HashPeImageByType (AuthData, AuthDataSize);
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- if (EFI_ERROR (Status)) {
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+ HashStatus = HashPeImageByType (AuthData, AuthDataSize);
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+ if (EFI_ERROR (HashStatus)) {
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continue;
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}
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--
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1.8.3.1
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