From: "Laszlo Ersek" <lersek@redhat.com>
To: devel@edk2.groups.io, zhiguang.liu@intel.com
Cc: Liming Gao <gaoliming@byosoft.com.cn>,
Jiaxin Wu <jiaxin.wu@intel.com>, Ray Ni <ray.ni@intel.com>,
Ard Biesheuvel <ardb+tianocore@kernel.org>,
Sami Mujawar <sami.mujawar@arm.com>
Subject: Re: [edk2-devel] [PATCH v2 4/4] StandaloneMmPkg: Disallow unregister MMI handler in other MMI handler
Date: Wed, 28 Feb 2024 09:47:31 +0100 [thread overview]
Message-ID: <c79d4f69-e809-9bfb-efeb-30a9b9f4722a@redhat.com> (raw)
In-Reply-To: <20240228022750.873-5-zhiguang.liu@intel.com>
On 2/28/24 03:27, Zhiguang Liu wrote:
> In last patch, we add code support to unregister MMI handler inside
> itself. However, the code doesn't support unregister MMI handler
> insider other MMI handler. While this is not a must-have usage.
> So add check to disallow unregister MMI handler in other MMI handler.
>
> Cc: Liming Gao <gaoliming@byosoft.com.cn>
> Cc: Jiaxin Wu <jiaxin.wu@intel.com>
> Cc: Ray Ni <ray.ni@intel.com>
> Cc: Laszlo Ersek <lersek@redhat.com>
> Cc: Ard Biesheuvel <ardb+tianocore@kernel.org>
> Cc: Sami Mujawar <sami.mujawar@arm.com>
> Cc: Ray Ni <ray.ni@intel.com>
> Signed-off-by: Zhiguang Liu <zhiguang.liu@intel.com>
> ---
> StandaloneMmPkg/Core/Mmi.c | 35 ++++++++++++++++++++++++++---------
> 1 file changed, 26 insertions(+), 9 deletions(-)
>
> diff --git a/StandaloneMmPkg/Core/Mmi.c b/StandaloneMmPkg/Core/Mmi.c
> index c1a1d76e85..54794c6b3d 100644
> --- a/StandaloneMmPkg/Core/Mmi.c
> +++ b/StandaloneMmPkg/Core/Mmi.c
> @@ -36,8 +36,9 @@ typedef struct {
> MMI_ENTRY *MmiEntry;
> } MMI_HANDLER;
>
> -LIST_ENTRY mRootMmiHandlerList = INITIALIZE_LIST_HEAD_VARIABLE (mRootMmiHandlerList);
> -LIST_ENTRY mMmiEntryList = INITIALIZE_LIST_HEAD_VARIABLE (mMmiEntryList);
> +LIST_ENTRY mRootMmiHandlerList = INITIALIZE_LIST_HEAD_VARIABLE (mRootMmiHandlerList);
> +LIST_ENTRY mMmiEntryList = INITIALIZE_LIST_HEAD_VARIABLE (mMmiEntryList);
> +MMI_HANDLER *gCurrentMmiHandler = NULL;
>
> /**
> Finds the MMI entry for the requested handler type.
> @@ -161,13 +162,19 @@ MmiManage (
> // get next node before handler is executed, since LIST_ENTRY that
> // Link points to may be freed if unregister MMI handler.
> //
> - Link = Link->ForwardLink;
> - Status = MmiHandler->Handler (
> - (EFI_HANDLE)MmiHandler,
> - Context,
> - CommBuffer,
> - CommBufferSize
> - );
> + Link = Link->ForwardLink;
> + //
> + // Assign gCurrentMmiHandle before calling the MMI handler and
> + // set to NULL when it returns.
> + //
> + gCurrentMmiHandler = MmiHandler;
> + Status = MmiHandler->Handler (
> + (EFI_HANDLE)MmiHandler,
> + Context,
> + CommBuffer,
> + CommBufferSize
> + );
> + gCurrentMmiHandler = NULL;
>
> switch (Status) {
> case EFI_INTERRUPT_PENDING:
> @@ -314,6 +321,16 @@ MmiHandlerUnRegister (
> return EFI_INVALID_PARAMETER;
> }
>
> + //
> + // Check if unregister MMI handler inside a MMI Handler
> + //
> + if (gCurrentMmiHandler != NULL) {
> + //
> + // Only allow to unregister MMI Handler inside itself.
> + //
> + ASSERT (gCurrentMmiHandler == MmiHandler);
> + }
> +
> MmiEntry = MmiHandler->MmiEntry;
>
> RemoveEntryList (&MmiHandler->Link);
same comment as for patch#2
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prev parent reply other threads:[~2024-02-28 8:47 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-02-28 2:27 [edk2-devel] [PATCH v2 0/4] Support to unregister SMI handler inside SMI handler Zhiguang Liu
2024-02-28 2:27 ` [edk2-devel] [PATCH v2 1/4] MdeModulePkg/SMM: " Zhiguang Liu
2024-02-29 12:24 ` Ni, Ray
2024-02-28 2:27 ` [edk2-devel] [PATCH v2 2/4] MdeModulePkg/SMM: Disallow unregister SMI handler in other " Zhiguang Liu
2024-02-28 8:45 ` Laszlo Ersek
2024-02-28 8:52 ` Zhiguang Liu
2024-02-28 2:27 ` [edk2-devel] [PATCH v2 3/4] StandaloneMmPkg: Support to unregister MMI handler inside MMI handler Zhiguang Liu
2024-02-28 8:47 ` Laszlo Ersek
2024-02-29 12:24 ` Ni, Ray
2024-03-11 14:02 ` Ard Biesheuvel
2024-02-28 2:27 ` [edk2-devel] [PATCH v2 4/4] StandaloneMmPkg: Disallow unregister MMI handler in other " Zhiguang Liu
2024-02-28 8:47 ` Laszlo Ersek [this message]
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