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Signed firmware measurements are allowed to be passed along to in the TCG and CC event logs according to the TCG PC Client Platform Firware Profile. The event logs include events that Tcg2Dxe reads from appropriately GUIDed HOBs, so allow opt/org.tianocode/sp800155evt/%d to pass along events that the VMM sees fit to provide. One event per number, starting from 0, increasing by 1 until there are no more contiguous files. The VMM may provide reference measurements through UEFI variables that it references from the SP800-155 event3 structure given the appropriate RIM locator type, or via URL, etc. Each event read from fw_cfg, is written one-by-one to a EFI_HOB_GUID_TYPE HOB created for the event. The name they target gTcg800155PlatformIdEventHobGuid for the later Dxe driver to use to extend the event log. Signed-off-by: Dionna Glaze <dionnaglaze@google.com>
125 lines
3.5 KiB
C
125 lines
3.5 KiB
C
/**@file
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PlatformId Event HOB creation
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Copyright (c) 2024, Google LLC. All rights reserved.<BR>
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SPDX-License-Identifier: BSD-2-Clause-Patent
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**/
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#include <Base.h>
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#include <Guid/TcgEventHob.h>
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#include <IndustryStandard/UefiTcgPlatform.h>
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#include <Library/BaseMemoryLib.h>
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#include <Library/BaseLib.h>
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#include <Library/DebugLib.h>
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#include <Library/HobLib.h>
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#include <Library/PeiServicesLib.h>
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#include <Library/PrintLib.h>
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#include <Library/QemuFwCfgLib.h>
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#define DPREFIX "sp800155evts: "
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/**
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* Creates an EFI_HOB_TYPE_GUID_EXTENSION HOB for a given SP800155 event.
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* Associates the string data with gTcg800155PlatformIdEventHobGuid. Any
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* unused bytes or out-of-bounds event sizes are considered corrupted and
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* are discarded.
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**/
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STATIC
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VOID
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PlatformIdRegisterSp800155 (
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IN CONST EFI_PEI_SERVICES **PeiServices,
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IN UINT8 *Evt,
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IN UINTN EvtSize
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)
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{
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EFI_STATUS Status;
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VOID *Hob;
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EFI_HOB_GUID_TYPE *GuidHob;
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UINT8 *EvtDest;
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Status = (*PeiServices)->CreateHob (
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PeiServices,
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EFI_HOB_TYPE_GUID_EXTENSION,
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sizeof (EFI_HOB_GUID_TYPE) + (UINT16)EvtSize,
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&Hob
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);
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if (EFI_ERROR (Status)) {
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DEBUG ((DEBUG_ERROR, DPREFIX "GUID HOB creation failed, skipping\n"));
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return;
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}
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GuidHob = (EFI_HOB_GUID_TYPE *)Hob;
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CopyGuid (&GuidHob->Name, &gTcg800155PlatformIdEventHobGuid);
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EvtDest = (UINT8 *)GET_GUID_HOB_DATA (Hob);
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CopyMem (EvtDest, Evt, EvtSize);
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// Fill the remaining HOB padding bytes with 0s.
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SetMem (EvtDest + EvtSize, GET_GUID_HOB_DATA_SIZE (Hob) - EvtSize, 0);
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}
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/**
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* Reads the given path from the fw_cfg file and registers it as an
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* EFI_HOB_GUID_EXTENSION HOB with gTcg800155PlatformIdEventHobGuid.
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* Returns FALSE iff the file does not exist.
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**/
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BOOLEAN
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PlatformIdRegisterEvent (
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IN CONST EFI_PEI_SERVICES **PeiServices,
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IN CONST CHAR8 *Path
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)
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{
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EFI_STATUS Status;
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UINTN NumPages;
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EFI_PHYSICAL_ADDRESS Pages;
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FIRMWARE_CONFIG_ITEM FdtItem;
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UINTN FdtSize;
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UINT8 *Evt;
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Status = QemuFwCfgFindFile (Path, &FdtItem, &FdtSize);
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if (EFI_ERROR (Status)) {
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return FALSE;
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}
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if (FdtSize > MAX_UINT16 - sizeof (EFI_HOB_GUID_TYPE)) {
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DEBUG ((DEBUG_ERROR, DPREFIX "Eventdata too large for HOB, skipping\n"));
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return TRUE;
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}
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NumPages = EFI_SIZE_TO_PAGES (FdtSize);
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Status = (*PeiServices)->AllocatePages (
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PeiServices,
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EfiBootServicesData,
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NumPages,
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&Pages
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);
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if (EFI_ERROR (Status)) {
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return TRUE;
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}
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Evt = (UINT8 *)(UINTN)Pages;
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QemuFwCfgSelectItem (FdtItem);
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QemuFwCfgReadBytes (FdtSize, Evt);
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PlatformIdRegisterSp800155 (PeiServices, Evt, FdtSize);
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Status = (*PeiServices)->FreePages (PeiServices, Pages, NumPages);
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ASSERT_EFI_ERROR (Status);
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return TRUE;
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}
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VOID
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PlatformIdInitialization (
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IN CONST EFI_PEI_SERVICES **PeiServices
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)
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{
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UINTN Index;
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CHAR8 Path[64];
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for (Index = 0; ; Index++) {
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AsciiSPrint (Path, sizeof (Path), "opt/org.tianocode/sp800155evt/%d", Index);
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if (!PlatformIdRegisterEvent (PeiServices, Path)) {
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break;
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}
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}
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}
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