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From 37b5981bf7eb94314b62810da495d724873d904a 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 12:42:40 +0100
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Subject: [PATCH 04/12] SecurityPkg/DxeImageVerificationHandler: keep PE/COFF
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info status internal
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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: <20200131124248.22369-5-lersek@redhat.com>
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Patchwork-id: 93609
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O-Subject: [RHEL-8.2.0 edk2 PATCH 04/12] SecurityPkg/DxeImageVerificationHandler: keep PE/COFF info status internal
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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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The PeCoffLoaderGetImageInfo() function may return various error codes,
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such as RETURN_INVALID_PARAMETER and RETURN_UNSUPPORTED.
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Such error values should not be assigned to our "Status" variable in the
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DxeImageVerificationHandler() function, because "Status" generally stands
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for the main exit value of the function. And
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SECURITY2_FILE_AUTHENTICATION_HANDLER functions are expected to return one
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of EFI_SUCCESS, EFI_SECURITY_VIOLATION, and EFI_ACCESS_DENIED only.
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Introduce the "PeCoffStatus" helper variable for keeping the return value
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of PeCoffLoaderGetImageInfo() internal to the function. If
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PeCoffLoaderGetImageInfo() fails, we'll jump to the "Done" label with
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"Status" being EFI_ACCESS_DENIED, inherited from the top of the function.
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Note that this is consistent with the subsequent PE/COFF Signature check,
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where we jump to the "Done" label with "Status" having been re-set to
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EFI_ACCESS_DENIED.
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As a consequence, we can at once remove the
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Status = EFI_ACCESS_DENIED;
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assignment right after the "PeCoffStatus" check.
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This patch does not change the control flow in the function, it only
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changes the "Status" outcome from API-incompatible error codes to
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EFI_ACCESS_DENIED, under some circumstances.
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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: <20200116190705.18816-4-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 61a9fa589a15e9005bec293f9766c78b60fbc9fc)
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Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
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---
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.../Library/DxeImageVerificationLib/DxeImageVerificationLib.c | 7 +++----
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1 file changed, 3 insertions(+), 4 deletions(-)
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diff --git a/SecurityPkg/Library/DxeImageVerificationLib/DxeImageVerificationLib.c b/SecurityPkg/Library/DxeImageVerificationLib/DxeImageVerificationLib.c
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index 8204c9c..e6c8a54 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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@@ -1580,6 +1580,7 @@ DxeImageVerificationHandler (
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EFI_IMAGE_DATA_DIRECTORY *SecDataDir;
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UINT32 OffSet;
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CHAR16 *NameStr;
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+ RETURN_STATUS PeCoffStatus;
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SignatureList = NULL;
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SignatureListSize = 0;
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@@ -1669,8 +1670,8 @@ DxeImageVerificationHandler (
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//
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// Get information about the image being loaded
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//
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- Status = PeCoffLoaderGetImageInfo (&ImageContext);
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- if (EFI_ERROR (Status)) {
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+ PeCoffStatus = PeCoffLoaderGetImageInfo (&ImageContext);
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+ if (RETURN_ERROR (PeCoffStatus)) {
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//
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// The information can't be got from the invalid PeImage
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//
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@@ -1678,8 +1679,6 @@ DxeImageVerificationHandler (
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goto Done;
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}
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- Status = EFI_ACCESS_DENIED;
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-
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DosHdr = (EFI_IMAGE_DOS_HEADER *) mImageBase;
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if (DosHdr->e_magic == EFI_IMAGE_DOS_SIGNATURE) {
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//
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--
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1.8.3.1
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