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From d9f12d175da2d203be078d03c9127293ea6fe86b 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 12:42:47 +0100
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Subject: [PATCH 11/12] SecurityPkg/DxeImageVerificationHandler: fix imgexec
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info on memalloc fail
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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: <20200131124248.22369-12-lersek@redhat.com>
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Patchwork-id: 93618
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O-Subject: [RHEL-8.2.0 edk2 PATCH 11/12] SecurityPkg/DxeImageVerificationHandler: fix imgexec info on memalloc fail
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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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It makes no sense to call AddImageExeInfo() with (Signature == NULL) and
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(SignatureSize > 0). AddImageExeInfo() does not crash in such a case -- it
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avoids the CopyMem() call --, but it creates an invalid
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EFI_IMAGE_EXECUTION_INFO record. Namely, the
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"EFI_IMAGE_EXECUTION_INFO.InfoSize" field includes "SignatureSize", but
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the actual signature bytes are not filled in.
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Document and ASSERT() this condition in AddImageExeInfo().
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In DxeImageVerificationHandler(), zero out "SignatureListSize" if we set
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"SignatureList" to NULL due to AllocateZeroPool() failure.
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(Another approach could be to avoid calling AddImageExeInfo() completely,
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in case AllocateZeroPool() fails. Unfortunately, the UEFI v2.8 spec does
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not seem to state clearly whether a signature is mandatory in
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EFI_IMAGE_EXECUTION_INFO, if the "Action" field is
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EFI_IMAGE_EXECUTION_AUTH_SIG_FAILED or EFI_IMAGE_EXECUTION_AUTH_SIG_FOUND.
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For now, the EFI_IMAGE_EXECUTION_INFO addition logic is not changed; we
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only make sure that the record we add is not malformed.)
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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: <20200116190705.18816-11-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 6aa31db5ebebe18b55aa5359142223a03592416f)
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Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
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---
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SecurityPkg/Library/DxeImageVerificationLib/DxeImageVerificationLib.c | 4 +++-
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1 file changed, 3 insertions(+), 1 deletion(-)
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diff --git a/SecurityPkg/Library/DxeImageVerificationLib/DxeImageVerificationLib.c b/SecurityPkg/Library/DxeImageVerificationLib/DxeImageVerificationLib.c
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index c98b9e4..015a5b6 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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@@ -704,7 +704,7 @@ GetImageExeInfoTableSize (
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@param[in] Name Input a null-terminated, user-friendly name.
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@param[in] DevicePath Input device path pointer.
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@param[in] Signature Input signature info in EFI_SIGNATURE_LIST data structure.
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- @param[in] SignatureSize Size of signature.
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+ @param[in] SignatureSize Size of signature. Must be zero if Signature is NULL.
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**/
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VOID
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@@ -761,6 +761,7 @@ AddImageExeInfo (
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//
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// Signature size can be odd. Pad after signature to ensure next EXECUTION_INFO entry align
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//
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+ ASSERT (Signature != NULL || SignatureSize == 0);
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NewImageExeInfoEntrySize = sizeof (EFI_IMAGE_EXECUTION_INFO) + NameStringLen + DevicePathSize + SignatureSize;
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NewImageExeInfoTable = (EFI_IMAGE_EXECUTION_INFO_TABLE *) AllocateRuntimePool (ImageExeInfoTableSize + NewImageExeInfoEntrySize);
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@@ -1858,6 +1859,7 @@ DxeImageVerificationHandler (
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SignatureListSize = sizeof (EFI_SIGNATURE_LIST) + sizeof (EFI_SIGNATURE_DATA) - 1 + mImageDigestSize;
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SignatureList = (EFI_SIGNATURE_LIST *) AllocateZeroPool (SignatureListSize);
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if (SignatureList == NULL) {
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+ SignatureListSize = 0;
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goto Failed;
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}
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SignatureList->SignatureHeaderSize = 0;
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--
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1.8.3.1
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