From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mga07.intel.com (mga07.intel.com [134.134.136.100]) by mx.groups.io with SMTP id smtpd.web09.6335.1611902711966156639 for ; Thu, 28 Jan 2021 22:45:12 -0800 Authentication-Results: mx.groups.io; dkim=missing; spf=pass (domain: intel.com, ip: 134.134.136.100, mailfrom: guomin.jiang@intel.com) IronPort-SDR: IXTzOvFA+lKpZMkDFN9r3CQumM3tfI3x2WLFsy94QIWnoV73ZQl6z41kGNitq9ML2Q6siPE416 GCTShED33/6g== X-IronPort-AV: E=McAfee;i="6000,8403,9878"; a="244463378" X-IronPort-AV: E=Sophos;i="5.79,384,1602572400"; d="scan'208";a="244463378" Received: from orsmga008.jf.intel.com ([10.7.209.65]) by orsmga105.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 28 Jan 2021 22:45:10 -0800 IronPort-SDR: pqhyBlAMPHLQbhbXT4dBrfqHu3BmFW8Yhhv4MMXPGOe5Q2Y7yimG5o/cM2P4AaHF1Lnb8xktry X9iF5E5Knc+Q== X-IronPort-AV: E=Sophos;i="5.79,384,1602572400"; d="scan'208";a="389181329" Received: from guominji-mobl.ccr.corp.intel.com ([10.238.14.22]) by orsmga008-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 28 Jan 2021 22:45:08 -0800 From: "Guomin Jiang" To: devel@edk2.groups.io Cc: Eric Dong , Ray Ni , Laszlo Ersek , Rahul Kumar , Debkumar De , Harry Han , Catharine West Subject: [PATCH 1/1] UefiCpuPkg: Move MigrateGdt from DiscoverMemory to TempRamDone. (CVE-2019-11098) Date: Fri, 29 Jan 2021 14:44:44 +0800 Message-Id: <20210129064444.599-1-guomin.jiang@intel.com> X-Mailer: git-send-email 2.30.0.windows.2 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit REF: https://bugzilla.tianocore.org/show_bug.cgi?id=1614 REF: https://bugzilla.tianocore.org/show_bug.cgi?id=3160 The GDT still in flash with commit 60b12e69fb1c8c7180fdda92f008248b9ec83db1 after TempRamDone So move the action to TempRamDone event to avoid reading GDT from flash. Signed-off-by: Guomin Jiang Cc: Eric Dong Cc: Ray Ni Cc: Laszlo Ersek Cc: Rahul Kumar Cc: Debkumar De Cc: Harry Han Cc: Catharine West --- UefiCpuPkg/SecCore/SecCore.inf | 1 + UefiCpuPkg/CpuMpPei/CpuMpPei.c | 37 --------------------------- UefiCpuPkg/CpuMpPei/CpuPaging.c | 8 ------ UefiCpuPkg/SecCore/SecMain.c | 45 +++++++++++++++++++++++++++++++++ 4 files changed, 46 insertions(+), 45 deletions(-) diff --git a/UefiCpuPkg/SecCore/SecCore.inf b/UefiCpuPkg/SecCore/SecCore.inf index 545781d6b4b3..ded83beb5272 100644 --- a/UefiCpuPkg/SecCore/SecCore.inf +++ b/UefiCpuPkg/SecCore/SecCore.inf @@ -77,6 +77,7 @@ [Guids] [Pcd] gUefiCpuPkgTokenSpaceGuid.PcdPeiTemporaryRamStackSize ## CONSUMES + gEfiMdeModulePkgTokenSpaceGuid.PcdMigrateTemporaryRamFirmwareVolumes ## CONSUMES [UserExtensions.TianoCore."ExtraFiles"] SecCoreExtra.uni diff --git a/UefiCpuPkg/CpuMpPei/CpuMpPei.c b/UefiCpuPkg/CpuMpPei/CpuMpPei.c index d07540cf7471..07ccbe7c6a91 100644 --- a/UefiCpuPkg/CpuMpPei/CpuMpPei.c +++ b/UefiCpuPkg/CpuMpPei/CpuMpPei.c @@ -429,43 +429,6 @@ GetGdtr ( AsmReadGdtr ((IA32_DESCRIPTOR *)Buffer); } -/** - Migrates the Global Descriptor Table (GDT) to permanent memory. - - @retval EFI_SUCCESS The GDT was migrated successfully. - @retval EFI_OUT_OF_RESOURCES The GDT could not be migrated due to lack of available memory. - -**/ -EFI_STATUS -MigrateGdt ( - VOID - ) -{ - EFI_STATUS Status; - UINTN GdtBufferSize; - IA32_DESCRIPTOR Gdtr; - VOID *GdtBuffer; - - AsmReadGdtr ((IA32_DESCRIPTOR *) &Gdtr); - GdtBufferSize = sizeof (IA32_SEGMENT_DESCRIPTOR) -1 + Gdtr.Limit + 1; - - Status = PeiServicesAllocatePool ( - GdtBufferSize, - &GdtBuffer - ); - ASSERT (GdtBuffer != NULL); - if (EFI_ERROR (Status)) { - return EFI_OUT_OF_RESOURCES; - } - - GdtBuffer = ALIGN_POINTER (GdtBuffer, sizeof (IA32_SEGMENT_DESCRIPTOR)); - CopyMem (GdtBuffer, (VOID *) Gdtr.Base, Gdtr.Limit + 1); - Gdtr.Base = (UINTN) GdtBuffer; - AsmWriteGdtr (&Gdtr); - - return EFI_SUCCESS; -} - /** Initializes CPU exceptions handlers for the sake of stack switch requirement. diff --git a/UefiCpuPkg/CpuMpPei/CpuPaging.c b/UefiCpuPkg/CpuMpPei/CpuPaging.c index 50ad4277af79..3e261d6657b3 100644 --- a/UefiCpuPkg/CpuMpPei/CpuPaging.c +++ b/UefiCpuPkg/CpuMpPei/CpuPaging.c @@ -605,17 +605,9 @@ MemoryDiscoveredPpiNotifyCallback ( { EFI_STATUS Status; BOOLEAN InitStackGuard; - BOOLEAN InterruptState; EDKII_MIGRATED_FV_INFO *MigratedFvInfo; EFI_PEI_HOB_POINTERS Hob; - if (PcdGetBool (PcdMigrateTemporaryRamFirmwareVolumes)) { - InterruptState = SaveAndDisableInterrupts (); - Status = MigrateGdt (); - ASSERT_EFI_ERROR (Status); - SetInterruptState (InterruptState); - } - // // Paging must be setup first. Otherwise the exception TSS setup during MP // initialization later will not contain paging information and then fail diff --git a/UefiCpuPkg/SecCore/SecMain.c b/UefiCpuPkg/SecCore/SecMain.c index 155be49a6011..2416c4ce56b2 100644 --- a/UefiCpuPkg/SecCore/SecMain.c +++ b/UefiCpuPkg/SecCore/SecMain.c @@ -35,6 +35,43 @@ EFI_PEI_PPI_DESCRIPTOR mPeiSecPlatformInformationPpi[] = { } }; +/** + Migrates the Global Descriptor Table (GDT) to permanent memory. + + @retval EFI_SUCCESS The GDT was migrated successfully. + @retval EFI_OUT_OF_RESOURCES The GDT could not be migrated due to lack of available memory. + +**/ +EFI_STATUS +MigrateGdt ( + VOID + ) +{ + EFI_STATUS Status; + UINTN GdtBufferSize; + IA32_DESCRIPTOR Gdtr; + VOID *GdtBuffer; + + AsmReadGdtr ((IA32_DESCRIPTOR *) &Gdtr); + GdtBufferSize = sizeof (IA32_SEGMENT_DESCRIPTOR) -1 + Gdtr.Limit + 1; + + Status = PeiServicesAllocatePool ( + GdtBufferSize, + &GdtBuffer + ); + ASSERT (GdtBuffer != NULL); + if (EFI_ERROR (Status)) { + return EFI_OUT_OF_RESOURCES; + } + + GdtBuffer = ALIGN_POINTER (GdtBuffer, sizeof (IA32_SEGMENT_DESCRIPTOR)); + CopyMem (GdtBuffer, (VOID *) Gdtr.Base, Gdtr.Limit + 1); + Gdtr.Base = (UINTN) GdtBuffer; + AsmWriteGdtr (&Gdtr); + + return EFI_SUCCESS; +} + // // These are IDT entries pointing to 10:FFFFFFE4h. // @@ -409,6 +446,14 @@ SecTemporaryRamDone ( // State = SaveAndDisableInterrupts (); + // + // Migrate GDT before NEM near down + // + if (PcdGetBool (PcdMigrateTemporaryRamFirmwareVolumes)) { + Status = MigrateGdt (); + ASSERT_EFI_ERROR (Status); + } + // // Disable Temporary RAM after Stack and Heap have been migrated at this point. // -- 2.25.1.windows.1