From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mga09.intel.com (mga09.intel.com [134.134.136.24]) by mx.groups.io with SMTP id smtpd.web12.2491.1579061362730105945 for ; Tue, 14 Jan 2020 20:09:22 -0800 Authentication-Results: mx.groups.io; dkim=missing; spf=pass (domain: intel.com, ip: 134.134.136.24, mailfrom: jian.j.wang@intel.com) X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga006.jf.intel.com ([10.7.209.51]) by orsmga102.jf.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 14 Jan 2020 20:09:22 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.70,321,1574150400"; d="scan'208";a="225863949" Received: from fmsmsx105.amr.corp.intel.com ([10.18.124.203]) by orsmga006.jf.intel.com with ESMTP; 14 Jan 2020 20:09:22 -0800 Received: from fmsmsx155.amr.corp.intel.com (10.18.116.71) by FMSMSX105.amr.corp.intel.com (10.18.124.203) with Microsoft SMTP Server (TLS) id 14.3.439.0; Tue, 14 Jan 2020 20:09:21 -0800 Received: from shsmsx101.ccr.corp.intel.com (10.239.4.153) by FMSMSX155.amr.corp.intel.com (10.18.116.71) with Microsoft SMTP Server (TLS) id 14.3.439.0; Tue, 14 Jan 2020 20:09:21 -0800 Received: from shsmsx107.ccr.corp.intel.com ([169.254.9.210]) by SHSMSX101.ccr.corp.intel.com ([169.254.1.30]) with mapi id 14.03.0439.000; Wed, 15 Jan 2020 12:09:19 +0800 From: "Wang, Jian J" To: "Kubacki, Michael A" , "devel@edk2.groups.io" CC: "Gao, Liming" , "Kinney, Michael D" , Michael Turner , "Wu, Hao A" Subject: Re: [edk2-devel] [PATCH V1 1/1] MdeModulePkg/Variable: Fix VarErrorFlag RT cache offset calculation Thread-Topic: [edk2-devel] [PATCH V1 1/1] MdeModulePkg/Variable: Fix VarErrorFlag RT cache offset calculation Thread-Index: AQHVymfr57GN2e33OkSU11c3ihA1NKfptZDwgAFHbaCAAB8PMA== Date: Wed, 15 Jan 2020 04:09:18 +0000 Message-ID: References: <20200113231908.29724-1-michael.a.kubacki@intel.com> In-Reply-To: Accept-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-titus-metadata-40: eyJDYXRlZ29yeUxhYmVscyI6IiIsIk1ldGFkYXRhIjp7Im5zIjoiaHR0cDpcL1wvd3d3LnRpdHVzLmNvbVwvbnNcL0ludGVsMyIsImlkIjoiNDU5NjIyMWMtNzIwMy00YmVmLTgwMmYtY2E5YmUwZWE5NmViIiwicHJvcHMiOlt7Im4iOiJDVFBDbGFzc2lmaWNhdGlvbiIsInZhbHMiOlt7InZhbHVlIjoiQ1RQX05UIn1dfV19LCJTdWJqZWN0TGFiZWxzIjpbXSwiVE1DVmVyc2lvbiI6IjE3LjEwLjE4MDQuNDkiLCJUcnVzdGVkTGFiZWxIYXNoIjoibXVmRFZZTko0WXVhSFdTQ3ZibGVTUkZqKzNub25LNmVtTFFXUTk2b0Z5ZmdKSTNTcWFcL2pXTWVZRWh3U0F2eUgifQ== x-ctpclassification: CTP_NT dlp-product: dlpe-windows dlp-version: 11.2.0.6 dlp-reaction: no-action x-originating-ip: [10.239.127.40] MIME-Version: 1.0 Return-Path: jian.j.wang@intel.com Content-Language: en-US Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Mike, Thanks for explaining. You're right that the error is rare case and it won= 't cause big problem, and NonVolatileLastVariableOffset will be approaching the whole FV size after some time. I don't have strong opinion. Both work for me. Regards, Jian > -----Original Message----- > From: Kubacki, Michael A > Sent: Wednesday, January 15, 2020 11:53 AM > To: Wang, Jian J ; devel@edk2.groups.io > Cc: Gao, Liming ; Kinney, Michael D > ; Michael Turner > ; Wu, Hao A > Subject: RE: [edk2-devel] [PATCH V1 1/1] MdeModulePkg/Variable: Fix > VarErrorFlag RT cache offset calculation >=20 > Hi Jian, >=20 > I considered that but these are the reasons I settled on the approach in= patch V1. >=20 > 1. With the variable store filled, the length of mVariableModuleGlobal- > >NonVolatileLastVariableOffset will only marginally be a smaller value t= han > mNvVariableCache->Size (since variable writes grow the store for SPI fla= sh wear > leveling). In this case, it will be ~CommonRuntimeVariableSpace which is= usually > a major portion of the variable store size anyway. > 2. Since mVariableModuleGlobal->NonVolatileLastVariableOffset is a globa= l > moving value that is more frequently manipulated than the fixed variable= store > size, depending upon it increases the likelihood it will be set to an in= valid value > somewhere else. > 3. This is a relatively rare case (an error condition) and the memory co= py is > within DRAM for variable stores that are typically ~128KB - ~512KB. >=20 > To reduce the copy size, the Offset parameter can be "(UINTN) VarErrFlag= - > (UINTN) mNvVariableCache" (just remove the unnecessary addition of (UINT= N) > mVariableModuleGlobal->VariableGlobal.NonVolatileVariableBase) with size > "sizeof (TempFlag)". How about this in a V2? >=20 > Thanks, > Michael >=20 > > -----Original Message----- > > From: Wang, Jian J > > Sent: Monday, January 13, 2020 10:43 PM > > To: devel@edk2.groups.io; Kubacki, Michael A > > > > Cc: Gao, Liming ; Kinney, Michael D > > ; Michael Turner > > ; Wu, Hao A > > Subject: RE: [edk2-devel] [PATCH V1 1/1] MdeModulePkg/Variable: Fix > > VarErrorFlag RT cache offset calculation > > > > Michael, > > > > I'm not sure sync-ing whole variable cache memory is an efficient oper= ation. > > What about using mVariableModuleGlobal->NonVolatileLastVariableOffset > > as Length parameter? > > > > Status =3D SynchronizeRuntimeVariableCache ( > > &mVariableModuleGlobal- > > >VariableGlobal.VariableRuntimeCacheContext.VariableRuntimeNvCache, > > 0, > > mVariableModuleGlobal->NonVolatileLastVariableOffse= t > > ); > > > > Regards, > > Jian > > > > > -----Original Message----- > > > From: devel@edk2.groups.io On Behalf Of > > > Kubacki, Michael A > > > Sent: Tuesday, January 14, 2020 7:19 AM > > > To: devel@edk2.groups.io > > > Cc: Gao, Liming ; Kinney, Michael D > > > ; Michael Turner > > > ; Wang, Jian J = ; > > > Wu, Hao A > > > Subject: [edk2-devel] [PATCH V1 1/1] MdeModulePkg/Variable: Fix > > > VarErrorFlag RT cache offset calculation > > > > > > REF:https://bugzilla.tianocore.org/show_bug.cgi?id=3D2457 > > > > > > This commit fixes an offset calculation that is used to write the > > > VarErrorFlag UEFI variable to the UEFI variable runtime cache. > > > > > > Currently a physical address is used instead of an offset. This comm= it > > > changes the offset to zero with a length of the entire non-volatile > > > variable store so the entire non-volatile variable store buffer in > > > SMRAM (with the variable update modification) is copied to the runti= me > > > variable cache. This follows the same pattern used in other > > > SynchronizeRuntimeVariableCache () calls for consistency. > > > > > > * Observable symptom: An exception in SMM will most likely occur > > > due to the invalid memory reference when the VarErrorFlag variable > > > is written. The variable is most commonly written when the UEFI > > > variable store is full. > > > > > > * The issue only occurs when the variable runtime cache is enabled > > > by the following PCD being set to TRUE: > > > gEfiMdeModulePkgTokenSpaceGuid.PcdEnableVariableRuntimeCache > > > > > > Fixes: aab3b9b9a1e5e1f3fa966fb1667fc3e6c47e7706 > > > > > > Cc: Liming Gao > > > Cc: Michael D Kinney > > > Cc: Michael Turner > > > Cc: Jian J Wang > > > Cc: Hao A Wu > > > Signed-off-by: Michael Kubacki > > > --- > > > MdeModulePkg/Universal/Variable/RuntimeDxe/Variable.c | 6 +++--- > > > 1 file changed, 3 insertions(+), 3 deletions(-) > > > > > > diff --git a/MdeModulePkg/Universal/Variable/RuntimeDxe/Variable.c > > > b/MdeModulePkg/Universal/Variable/RuntimeDxe/Variable.c > > > index b0ee5e50d0..d23aea4bc7 100644 > > > --- a/MdeModulePkg/Universal/Variable/RuntimeDxe/Variable.c > > > +++ b/MdeModulePkg/Universal/Variable/RuntimeDxe/Variable.c > > > @@ -16,7 +16,7 @@ > > > VariableServiceSetVariable() should also check authenticate data = to > > > avoid buffer overflow, > > > integer overflow. It should also check attribute to avoid authent= ication > > bypass. > > > > > > -Copyright (c) 2006 - 2019, Intel Corporation. All rights > > > reserved.
> > > +Copyright (c) 2006 - 2020, Intel Corporation. All rights > > > +reserved.
> > > (C) Copyright 2015-2018 Hewlett Packard Enterprise Development LP > > > SPDX-License-Identifier: BSD-2-Clause-Patent > > > > > > @@ -335,8 +335,8 @@ RecordVarErrorFlag ( > > > *VarErrFlag =3D TempFlag; > > > Status =3D SynchronizeRuntimeVariableCache ( > > > &mVariableModuleGlobal- > > > >VariableGlobal.VariableRuntimeCacheContext.VariableRuntimeNvCache, > > > - (UINTN) VarErrFlag - (UINTN) mNvVariableCache + (= UINTN) > > > mVariableModuleGlobal->VariableGlobal.NonVolatileVariableBase, > > > - sizeof (TempFlag) > > > + 0, > > > + mNvVariableCache->Size > > > ); > > > ASSERT_EFI_ERROR (Status); > > > } > > > -- > > > 2.16.2.windows.1 > > > > > > > > >=20 > > >=20