[edk2-devel] [PATCH edk2 v1 1/1] MdeModulePkg/Variable: Move FindVariable after AutoUpdateLangVariable

[Guomin Jiang]

So I think the key point is why AutoUpdateLangVariable() return success rather than fail, if is it reasonable for this case or we need other error handing?

I am glad to help you but I can't reproduce it until now, can you provide a step to reproduce it in simulation platform.

If it is urgent, I suggest that discuss with your internal team first and explain that we need consider the risk check it into edk2.

Best Regards
Guomin

> -----Original Message-----
> From: devel at edk2.groups.io <devel at edk2.groups.io> On Behalf Of Ming
> Huang via groups.io
> Sent: Tuesday, June 30, 2020 8:26 PM
> To: Jiang, Guomin <guomin.jiang at intel.com>; devel at edk2.groups.io; Wang,
> Jian J <jian.j.wang at intel.com>; Wu, Hao A <hao.a.wu at intel.com>; Gao,
> Liming <liming.gao at intel.com>
> Cc: lidongzhan at huawei.com; songdongkuang at huawei.com;
> wanghuiqiang at huawei.com; qiuliangen at huawei.com;
> shenlimei at huawei.com; xiewenyi2 at huawei.com
> Subject: Re: [edk2-devel] [PATCH edk2 v1 1/1] MdeModulePkg/Variable:
> Move FindVariable after AutoUpdateLangVariable
> 
> 
> 
> 在 2020/6/30 8:58, Jiang, Guomin 写道:
> > Hi Huang,
> >
> >>From issue statement, I guess that
> > 1. AutoUpdateLangVariable() invoked, and it will invoke FindVariable()
> > first, at the same time, reclaim occur and Variable.CurrPtr is invalid, it return
> with success 2. UpdateVariable() is invoked when The old Lang's State is valid
> and the new Lang's State is also valid.
> > 3. In the situation, FindVariable() checked Lang's State and only enable one
> Lang's State. But it didn't in fact.
> > 4. BmForEachVariable() deadloop in the situation.
> >
> > Am I right?
> 
> Yes, right.
> 
> Thanks,
> Ming
> 
> >
> >> -----Original Message-----
> >> From: devel at edk2.groups.io <devel at edk2.groups.io> On Behalf Of Ming
> >> Huang via groups.io
> >> Sent: Monday, June 29, 2020 2:06 PM
> >> To: devel at edk2.groups.io; Wang, Jian J <jian.j.wang at intel.com>; Wu,
> >> Hao A <hao.a.wu at intel.com>; Gao, Liming <liming.gao at intel.com>
> >> Cc: lidongzhan at huawei.com; huangming23 at huawei.com;
> >> songdongkuang at huawei.com; wanghuiqiang at huawei.com;
> >> qiuliangen at huawei.com; shenlimei at huawei.com;
> xiewenyi2 at huawei.com
> >> Subject: [edk2-devel] [PATCH edk2 v1 1/1] MdeModulePkg/Variable:
> Move
> >> FindVariable after AutoUpdateLangVariable
> >>
> >> When occur reclaim in AutoUpdateLangVariable(), the CurrPtr of
> >> Variable is invalid. The State will be update with wrong position
> >> after UpdateVariable in this situation and two valid PlatformLang or Lang
> variables will exist.
> >> BmForEachVariable() will enter endless loop while exist two valid
> >> PlatformLang variables. So FindVariable() should be invoked atfer
> >> AutoUpdateLangVariable().
> >>
> >> https://bugzilla.tianocore.org/show_bug.cgi?id=2667
> >>
> >> Signed-off-by: Ming Huang <huangming23 at huawei.com>
> >> ---
> >>  MdeModulePkg/Universal/Variable/RuntimeDxe/Variable.c | 26
> >> ++++++++++----------
> >>  1 file changed, 13 insertions(+), 13 deletions(-)
> >>
> >> diff --git a/MdeModulePkg/Universal/Variable/RuntimeDxe/Variable.c
> >> b/MdeModulePkg/Universal/Variable/RuntimeDxe/Variable.c
> >> index 1e71fc6..0cec981 100644
> >> --- a/MdeModulePkg/Universal/Variable/RuntimeDxe/Variable.c
> >> +++ b/MdeModulePkg/Universal/Variable/RuntimeDxe/Variable.c
> >> @@ -2741,6 +2741,19 @@ VariableServiceSetVariable (
> >>      mVariableModuleGlobal->NonVolatileLastVariableOffset = (UINTN)
> >> NextVariable - (UINTN) Point;
> >>    }
> >>
> >> +  if (!FeaturePcdGet (PcdUefiVariableDefaultLangDeprecate)) {
> >> +    //
> >> +    // Hook the operation of setting PlatformLangCodes/PlatformLang
> >> + and
> >> LangCodes/Lang.
> >> +    //
> >> +    Status = AutoUpdateLangVariable (VariableName, Data, DataSize);
> >> +    if (EFI_ERROR (Status)) {
> >> +      //
> >> +      // The auto update operation failed, directly return to avoid
> >> inconsistency between PlatformLang and Lang.
> >> +      //
> >> +      goto Done;
> >> +    }
> >> +  }
> >> +
> >>    //
> >>    // Check whether the input variable is already existed.
> >>    //
> >> @@ -2763,19 +2776,6 @@ VariableServiceSetVariable (
> >>      }
> >>    }
> >>
> >> -  if (!FeaturePcdGet (PcdUefiVariableDefaultLangDeprecate)) {
> >> -    //
> >> -    // Hook the operation of setting PlatformLangCodes/PlatformLang and
> >> LangCodes/Lang.
> >> -    //
> >> -    Status = AutoUpdateLangVariable (VariableName, Data, DataSize);
> >> -    if (EFI_ERROR (Status)) {
> >> -      //
> >> -      // The auto update operation failed, directly return to avoid
> inconsistency
> >> between PlatformLang and Lang.
> >> -      //
> >> -      goto Done;
> >> -    }
> >> -  }
> >> -
> >>    if (mVariableModuleGlobal->VariableGlobal.AuthSupport) {
> >>      Status = AuthVariableLibProcessVariable (VariableName,
> >> VendorGuid, Data, DataSize, Attributes);
> >>    } else {
> >> --
> >> 2.8.1
> >>
> >>
> >>
> >
> >
> >
> 
> 
> 


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