Reviewed-by: Ray Ni <ray...@intel.com>
Thanks,
Ray
> -----Original Message-----
> From: Liu, Zhiguang <zhiguang....@intel.com>
> Sent: Friday, March 1, 2024 11:02 AM
> To: devel@edk2.groups.io
> Cc: Liu, Zhiguang <zhiguang....@intel.com>; Liming Gao
> <gaolim...@byosoft.com.cn>; Wu, Jiaxin <jiaxin...@intel.com>; Ni, Ray
> <ray...@intel.com>; Laszlo Ersek <ler...@redhat.com>
> Subject: [PATCH v3 2/4] MdeModulePkg/SMM: Disallow unregister SMI
> handler in other SMI handler
>
> In last patch, we add code support to unregister SMI handler inside
> itself. However, the code doesn't support unregister SMI handler
> insider other SMI handler. While this is not a must-have usage.
> So add check to disallow unregister SMI handler in other SMI handler.
>
> Cc: Liming Gao <gaolim...@byosoft.com.cn>
> Cc: Jiaxin Wu <jiaxin...@intel.com>
> Cc: Ray Ni <ray...@intel.com>
> Cc: Laszlo Ersek <ler...@redhat.com>
> Signed-off-by: Zhiguang Liu <zhiguang....@intel.com>
> ---
> MdeModulePkg/Core/PiSmmCore/Smi.c | 29
> +++++++++++++++++++++--------
> 1 file changed, 21 insertions(+), 8 deletions(-)
>
> diff --git a/MdeModulePkg/Core/PiSmmCore/Smi.c
> b/MdeModulePkg/Core/PiSmmCore/Smi.c
> index 3489c130fd..b3a81ac877 100644
> --- a/MdeModulePkg/Core/PiSmmCore/Smi.c
> +++ b/MdeModulePkg/Core/PiSmmCore/Smi.c
> @@ -8,7 +8,8 @@
>
> #include "PiSmmCore.h"
>
> -LIST_ENTRY mSmiEntryList = INITIALIZE_LIST_HEAD_VARIABLE
> (mSmiEntryList);
> +SMI_HANDLER *mCurrentSmiHandler = NULL;
> +LIST_ENTRY mSmiEntryList = INITIALIZE_LIST_HEAD_VARIABLE
> (mSmiEntryList);
>
> SMI_ENTRY mRootSmiEntry = {
> SMI_ENTRY_SIGNATURE,
> @@ -142,13 +143,18 @@ SmiManage (
> // Link points to may be freed if unregister SMI handler.
> //
> Link = Link->ForwardLink;
> -
> - Status = SmiHandler->Handler (
> - (EFI_HANDLE)SmiHandler,
> - Context,
> - CommBuffer,
> - CommBufferSize
> - );
> + //
> + // Assign gCurrentSmiHandle before calling the SMI handler and
> + // set to NULL when it returns.
> + //
> + mCurrentSmiHandler = SmiHandler;
> + Status = SmiHandler->Handler (
> + (EFI_HANDLE)SmiHandler,
> + Context,
> + CommBuffer,
> + CommBufferSize
> + );
> + mCurrentSmiHandler = NULL;
>
> switch (Status) {
> case EFI_INTERRUPT_PENDING:
> @@ -328,6 +334,13 @@ SmiHandlerUnRegister (
> return EFI_INVALID_PARAMETER;
> }
>
> + //
> + // Do not allow to unregister SMI Handler inside other SMI Handler
> + //
> + if ((mCurrentSmiHandler != NULL) && (mCurrentSmiHandler !=
> SmiHandler)) {
> + return EFI_INVALID_PARAMETER;
> + }
> +
> SmiEntry = SmiHandler->SmiEntry;
>
> RemoveEntryList (&SmiHandler->Link);
> --
> 2.31.1.windows.1
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