Re: [Patch] SecurityPkg: TcgSmm: Handle invalid parameter in MOR SMI handler

["Long, Qin" <qin.long@intel.com>]

Reviewed-by: Long Qin <qin.long@intel.com>


Best Regards & Thanks,
LONG, Qin

> -----Original Message-----
> From: Zhang, Chao B
> Sent: Thursday, July 19, 2018 6:00 PM
> To: edk2-devel@lists.01.org
> Cc: Long, Qin <qin.long@intel.com>; Yao, Jiewen <jiewen.yao@intel.com>;
> Zhang, Chao B <chao.b.zhang@intel.com>
> Subject: [Patch] SecurityPkg: TcgSmm: Handle invalid parameter in MOR SMI
> handler
> 
> Add more logic to filter invalid function parameter in MOR Control SMI handler
> 
> Cc: Long Qin <qin.long@intel.com>
> Cc: Yao Jiewen <jiewen.yao@intel.com>
> Contributed-under: TianoCore Contribution Agreement 1.1
> Signed-off-by: Chao Zhang <chao.b.zhang@intel.com>
> Signed-off-by: Zhang, Chao B <chao.b.zhang@intel.com>
> ---
>  SecurityPkg/Tcg/Tcg2Smm/Tcg2Smm.c | 4 ++++
>  SecurityPkg/Tcg/TcgSmm/TcgSmm.c   | 4 ++++
>  2 files changed, 8 insertions(+)
> 
> diff --git a/SecurityPkg/Tcg/Tcg2Smm/Tcg2Smm.c
> b/SecurityPkg/Tcg/Tcg2Smm/Tcg2Smm.c
> index 21b1014a3b..4a1a293bfc 100644
> --- a/SecurityPkg/Tcg/Tcg2Smm/Tcg2Smm.c
> +++ b/SecurityPkg/Tcg/Tcg2Smm/Tcg2Smm.c
> @@ -151,10 +151,14 @@ MemoryClearCallback (
> 
>      if (MOR_CLEAR_MEMORY_VALUE (MorControl) == 0x0) {
>        return EFI_SUCCESS;
>      }
>      MorControl &= ~MOR_CLEAR_MEMORY_BIT_MASK;
> +  } else {
> +    mTcgNvs->MemoryClear.ReturnCode = MOR_REQUEST_GENERAL_FAILURE;
> +    DEBUG ((EFI_D_ERROR, "[TPM] MOR Parameter error! Parameter = %x\n",
> mTcgNvs->MemoryClear.Parameter));
> +    return EFI_SUCCESS;
>    }
> 
>    DataSize = sizeof (UINT8);
>    Status = mSmmVariable->SmmSetVariable (
>                             MEMORY_OVERWRITE_REQUEST_VARIABLE_NAME,
> diff --git a/SecurityPkg/Tcg/TcgSmm/TcgSmm.c
> b/SecurityPkg/Tcg/TcgSmm/TcgSmm.c index 0b8a002a4d..d3ddae6886 100644
> --- a/SecurityPkg/Tcg/TcgSmm/TcgSmm.c
> +++ b/SecurityPkg/Tcg/TcgSmm/TcgSmm.c
> @@ -269,10 +269,14 @@ MemoryClearCallback (
> 
>      if (MOR_CLEAR_MEMORY_VALUE (MorControl) == 0x0) {
>        return EFI_SUCCESS;
>      }
>      MorControl &= ~MOR_CLEAR_MEMORY_BIT_MASK;
> +  } else {
> +    mTcgNvs->MemoryClear.ReturnCode = MOR_REQUEST_GENERAL_FAILURE;
> +    DEBUG ((EFI_D_ERROR, "[TPM] MOR Parameter error! Parameter = %x\n",
> mTcgNvs->MemoryClear.Parameter));
> +    return EFI_SUCCESS;
>    }
> 
>    DataSize = sizeof (UINT8);
>    Status = mSmmVariable->SmmSetVariable (
>                             MEMORY_OVERWRITE_REQUEST_VARIABLE_NAME,
> --
> 2.16.2.windows.1